*,
*::before,
*::after {
  box-sizing: border-box;
}

:root {
  /* Baza — tła */
  --bg-main: #121212;
  --bg-card: #1e1e24;
  --bg-card-hover: #282830;
  --card-front: #25252c;
  --card-back: #2c2c34;

  /* Tekst */
  --text-main: #f5f5f5;
  --text-muted: #a0a0a0;

  /* Akcenty z logo (brand) */
  --accent-fizki: #ffc700;
  --accent-fizki-hover: #e5b300;
  --accent-on-fizki: #000000;

  /* Statusy (progress bar i bramka) */
  --status-correct: #00e676;
  --status-wrong: #ff3d00;
  --status-new: #29b6f6;

  /* Hierarchia statusów (CRM, analityka, kalendarz) */
  --status-good: #22c55e;
  --status-warning: #eab308;
  --status-critical: #ef4444;

  /* UI */
  --border-color: #333333;
  --radius: 16px;
  --shadow: 0 12px 40px rgba(0, 0, 0, 0.45);
  font-family: "Segoe UI", system-ui, sans-serif;
}

[data-theme="light"] {
  --bg-main: #f4f4f9;
  --bg-card: #ffffff;
  --bg-card-hover: #f0f0f5;
  --card-front: #e8f0f8;
  --card-back: #fdf6e3;

  --text-main: #1a1a1a;
  --text-muted: #5c5c5c;

  --status-correct: #2e7d32;
  --status-wrong: #c62828;
  --status-new: #1e3a5f;

  --status-good: #16a34a;
  --status-warning: #ca8a04;
  --status-critical: #dc2626;

  --border-color: #e0e0e0;
  --shadow: 0 12px 40px rgba(30, 58, 95, 0.12);
}

body {
  margin: 0;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  background: var(--bg-main);
  color: var(--text-main);
  line-height: 1.45;
}

button {
  transition: all 0.2s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(6px) scale(0.985);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes backdropFadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.katex {
  color: var(--text-main);
}

.app-shell {
  max-width: 28rem;
  margin: 0 auto;
  width: 100%;
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
}

.app-brand {
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0.35rem;
  padding: 0.55rem 1rem 0.35rem;
}

.app-brand-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.65rem;
  width: 100%;
  min-width: 0;
}

.app-brand-link {
  display: inline-block;
  flex-shrink: 0;
  line-height: 0;
}

.app-mini-breadcrumb {
  display: block;
  margin: 0;
  padding: 0.25rem 0.55rem;
  max-width: 100%;
  align-self: flex-start;
  border: none;
  border-radius: 999px;
  background: color-mix(in srgb, var(--bg-card) 88%, transparent);
  color: var(--text-muted);
  font: inherit;
  font-size: 0.72rem;
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: color 0.15s ease, background 0.15s ease;
  -webkit-tap-highlight-color: transparent;
}

.app-mini-breadcrumb:hover {
  color: var(--text-main);
  background: var(--bg-card);
}

.app-mini-breadcrumb:focus-visible {
  outline: 2px solid var(--accent-fizki);
  outline-offset: 2px;
}

.hidden,
[hidden] {
  display: none !important;
}

.app-auth-nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex: 1 1 auto;
  flex-wrap: wrap;
  gap: 0.35rem;
  min-width: 0;
}

.app-auth-login {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  justify-content: flex-end;
}

.btn-auth-login {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
  padding: 0.38rem 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 999px;
  background: var(--bg-card);
  color: var(--text-main);
  font: inherit;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
  -webkit-tap-highlight-color: transparent;
}

.btn-auth-login:hover {
  border-color: var(--accent-fizki);
  background: var(--bg-card-hover);
}

.btn-auth-login:focus-visible {
  outline: 2px solid var(--accent-fizki);
  outline-offset: 2px;
}

.app-auth-profile {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.28rem 0.55rem 0.28rem 0.35rem;
  border: 1px solid var(--border-color);
  border-radius: 999px;
  background: var(--bg-card);
  max-width: 100%;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.user-badge:hover,
.app-auth-profile:hover,
#profile-student:hover,
#profile-teacher:hover {
  transform: scale(1.02);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

[data-theme="light"] .user-badge:hover,
[data-theme="light"] .app-auth-profile:hover,
[data-theme="light"] #profile-student:hover,
[data-theme="light"] #profile-teacher:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
}

.app-auth-profile--student {
  flex-wrap: nowrap;
  justify-content: flex-end;
  gap: 0.3rem 0.35rem;
  padding: 0.28rem 0.5rem 0.28rem 0.28rem;
  cursor: pointer;
}

.app-auth-streak {
  display: inline-flex;
  align-items: center;
  padding: 0.18rem 0.45rem;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, #f59e0b 40%, var(--border-color));
  background: color-mix(in srgb, #f59e0b 16%, var(--bg-card));
  color: var(--text-main);
  font-size: 0.72rem;
  font-weight: 700;
  line-height: 1.2;
  white-space: nowrap;
}

[data-theme="light"] .app-auth-streak {
  background: color-mix(in srgb, #f59e0b 14%, #fff);
  border-color: color-mix(in srgb, #f59e0b 45%, #e5e7eb);
}

.app-auth-profile--student .app-auth-label {
  margin-right: 0.05rem;
}

.app-auth-profile--student .btn-auth-logout {
  margin-left: 0;
}

.app-auth-profile--teacher {
  cursor: pointer;
}

.app-auth-profile--teacher .btn-auth-logout {
  margin-left: 0;
}

.app-auth-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  object-fit: cover;
  display: block;
}

.app-auth-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-main);
  white-space: nowrap;
}

.btn-auth-logout {
  margin-left: 0.15rem;
  padding: 0.2rem 0.45rem;
  border: none;
  border-radius: 999px;
  background: transparent;
  color: var(--text-muted);
  font: inherit;
  font-size: 0.72rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 2px;
  -webkit-tap-highlight-color: transparent;
}

.btn-auth-logout:hover {
  color: var(--text-main);
}

.btn-auth-logout:focus-visible {
  outline: 2px solid var(--accent-fizki);
  outline-offset: 2px;
}

body.login-modal-open,
body.teacher-modal-open {
  overflow: hidden;
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 1050;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.modal.hidden {
  display: none;
}

.modal-backdrop,
.login-modal-backdrop,
.teacher-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.modal:not(.hidden) .modal-backdrop,
.login-modal:not(.hidden) .modal-backdrop,
.login-modal:not(.hidden) .login-modal-backdrop,
.teacher-modal:not([hidden]) .teacher-modal-backdrop {
  animation: backdropFadeIn 0.2s ease-out;
}

.modal .modal-content {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 22rem;
  padding: 1.35rem 1.25rem 1.25rem;
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  box-shadow: 0 16px 48px color-mix(in srgb, #000 35%, transparent);
}

.modal:not(.hidden) .modal-content,
.login-modal:not(.hidden) .modal-content,
#student-dashboard:not(.hidden) .modal-content,
#teacher-dashboard:not(.hidden) .modal-content,
#quiz-creator-modal:not(.hidden) .modal-content,
#lesson-detail-modal:not(.hidden) .modal-content,
#topic-modal:not(.hidden) .modal-content {
  animation: fadeIn 0.2s ease-out;
}

.login-modal {
  position: fixed;
  inset: 0;
  z-index: 1050;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.login-modal[hidden],
.login-modal.hidden {
  display: none;
}

.login-modal .modal-content {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 22rem;
  padding: 1.35rem 1.25rem 1.25rem;
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  box-shadow: 0 16px 48px color-mix(in srgb, #000 35%, transparent);
}

.login-modal-close {
  position: absolute;
  top: 0.65rem;
  right: 0.65rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  padding: 0;
  border: 1px solid var(--border-color);
  border-radius: 999px;
  background: var(--bg-main);
  color: var(--text-muted);
  font: inherit;
  font-size: 1.25rem;
  line-height: 1;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease;
  -webkit-tap-highlight-color: transparent;
}

.login-modal-close:hover {
  color: var(--text-main);
  border-color: var(--accent-fizki);
}

.login-modal-close:focus-visible {
  outline: 2px solid var(--accent-fizki);
  outline-offset: 2px;
}

.login-modal-heading {
  margin: 0 2rem 1.1rem 0;
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-main);
  text-align: center;
}

.login-mock-form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.login-mock-field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.login-mock-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
}

.login-modal-input {
  width: 100%;
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--text-muted);
  border-radius: 10px;
  background: var(--bg-main);
  color: var(--text-main);
  font: inherit;
  font-size: 0.9rem;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.login-modal-input::placeholder {
  color: var(--text-muted);
}

.login-modal-input:focus {
  outline: none;
  border-color: var(--accent-fizki);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent-fizki) 30%, transparent);
}

.login-mock-submit {
  width: 100%;
  margin-top: 0.15rem;
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  background: color-mix(in srgb, var(--text-muted) 35%, var(--bg-card));
  color: var(--text-muted);
  font: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: not-allowed;
  opacity: 0.85;
}

.login-demo-separator {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin: 0 0 1rem;
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  text-transform: uppercase;
}

.login-demo-separator::before,
.login-demo-separator::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border-color);
}

.login-demo-separator span {
  flex-shrink: 0;
  text-align: center;
}

.login-demo-actions {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.login-demo-btn {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: var(--bg-main);
  color: var(--text-main);
  font: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease, transform 0.1s ease;
  -webkit-tap-highlight-color: transparent;
}

.login-demo-btn:hover {
  border-color: var(--accent-fizki);
  background: var(--bg-card-hover);
}

.login-demo-btn:active {
  transform: scale(0.98);
}

.login-demo-btn:focus-visible {
  outline: 2px solid var(--accent-fizki);
  outline-offset: 2px;
}

.login-demo-btn--teacher {
  border-color: color-mix(in srgb, #1e3a5f 45%, var(--border-color));
  background: color-mix(in srgb, #1e3a5f 18%, var(--bg-main));
}

.login-demo-btn--teacher:hover {
  border-color: var(--accent-fizki);
  background: color-mix(in srgb, #1e3a5f 28%, var(--bg-card-hover));
}

.student-dashboard-panel {
  max-width: 24rem;
  margin: 0;
  padding: 1rem;
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  box-shadow: 0 16px 48px color-mix(in srgb, #000 35%, transparent);
}

[data-theme="light"] .student-dashboard-panel {
  box-shadow: 0 16px 48px rgba(15, 23, 42, 0.1);
}

.student-modal-tabs,
.modal-tabs {
  display: flex;
  gap: 0.35rem;
  margin: 0 0 0.85rem;
  padding-right: 2rem;
}

.btn-s-tab {
  flex: 1 1 0;
  padding: 0.42rem 0.65rem;
  border: 1px solid var(--border-color);
  border-radius: 999px;
  background: var(--bg-main);
  color: var(--text-main);
  font: inherit;
  font-size: 0.78rem;
  font-weight: 700;
  line-height: 1.2;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
  -webkit-tap-highlight-color: transparent;
}

.btn-s-tab:hover {
  border-color: color-mix(in srgb, var(--accent-fizki) 45%, var(--border-color));
  background: var(--bg-card-hover);
}

.btn-s-tab:focus-visible {
  outline: 2px solid var(--accent-fizki);
  outline-offset: 2px;
}

.btn-s-tab.active {
  background: var(--accent-fizki) !important;
  color: #000 !important;
  border-color: var(--accent-fizki);
}

.s-view {
  min-width: 0;
  opacity: 1;
  transition: opacity 0.2s ease;
}

#student-dashboard .s-view:not(.hidden) {
  animation: s-view-fade-in 0.2s ease;
}

@keyframes s-view-fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.1rem;
  border: none;
  border-radius: 12px;
  font: inherit;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  background: var(--accent-fizki);
  color: var(--accent-on-fizki);
  width: 100%;
  transition: background 0.15s ease, transform 0.1s ease;
  -webkit-tap-highlight-color: transparent;
}

.btn-primary:hover {
  background: var(--accent-fizki-hover);
}

.btn-primary:active {
  transform: scale(0.98);
}

.btn-primary:focus-visible {
  outline: 2px solid var(--accent-fizki);
  outline-offset: 2px;
}

/* —— Marketplace korepetycji (panel ucznia) —— */
#s-tutor-list-view {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.tutor-card {
  padding: 1rem;
  border-radius: 12px;
  border: 1px solid color-mix(in srgb, var(--text-main) 8%, transparent);
  background: var(--bg-main);
}

.tutor-card-header {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  margin-bottom: 0.75rem;
}

.tutor-avatar {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.82rem;
  font-weight: 800;
  line-height: 1;
}

.tutor-avatar--accent {
  background: var(--accent-fizki);
  color: #000;
}

.tutor-avatar--sky {
  background: #0ea5e9;
  color: #fff;
}

.tutor-card-info {
  min-width: 0;
}

.tutor-name {
  font-weight: 800;
  font-size: 1.1rem;
  line-height: 1.25;
  color: var(--text-main);
}

.tutor-meta {
  font-size: 0.75rem;
  line-height: 1.35;
  color: var(--text-muted);
}

.tutor-bio {
  margin: 0 0 0.75rem;
  font-size: 0.85rem;
  line-height: 1.4;
  color: var(--text-muted);
}

.tutor-card .btn-primary {
  font-size: 0.9rem;
  padding: 0.65rem 1rem;
}

.s-tutor-calendar-header {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid color-mix(in srgb, var(--text-main) 8%, transparent);
}

.s-tutor-back-btn {
  flex-shrink: 0;
  width: auto;
  padding: 0.25rem 0.5rem;
  font-size: 0.8rem;
}

.s-tutor-calendar-heading {
  margin: 0;
  font-size: 1rem;
  font-weight: 800;
  line-height: 1.25;
  color: var(--text-main);
}

.s-tutor-calendar-hint {
  margin: 0 0 0.75rem;
  font-size: 0.85rem;
  line-height: 1.4;
  color: var(--text-muted);
}

.s-tutor-time-slots {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.s-tutor-time-slots .btn-time-slot {
  width: 100%;
  padding: 0.65rem;
  font-size: 0.85rem;
}

.student-dashboard-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.65rem;
  flex-wrap: wrap;
  margin-bottom: 0.85rem;
  padding-right: 2rem;
}

.student-profile-hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 0.55rem;
  margin-bottom: 1rem;
  padding-top: 0.25rem;
}

.student-profile-avatar {
  width: 70px;
  height: 70px;
  border-radius: 50%;
  object-fit: cover;
  display: block;
  border: 2px solid color-mix(in srgb, var(--accent-fizki) 35%, var(--border-color));
  box-shadow: 0 4px 16px color-mix(in srgb, #0d8abc 22%, transparent);
}

.student-profile-name {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 800;
  line-height: 1.25;
  color: var(--text-main);
}

.student-profile-streak {
  margin: 0 auto;
}

.student-dashboard-title {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-main);
}

.student-dashboard-streak {
  display: inline-flex;
  align-items: center;
  padding: 0.22rem 0.55rem;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, #f59e0b 40%, var(--border-color));
  background: color-mix(in srgb, #f59e0b 16%, var(--bg-main));
  font-size: 0.75rem;
  font-weight: 700;
  line-height: 1.2;
  white-space: nowrap;
  color: var(--text-main);
}

.student-dashboard-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.55rem;
  margin-bottom: 0.85rem;
}

.student-stat-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.2rem;
  padding: 0.75rem 0.5rem;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  background: var(--bg-main);
  text-align: center;
}

.student-stat-value {
  font-size: 1.35rem;
  font-weight: 800;
  line-height: 1.1;
  color: var(--text-main);
}

.student-stat-label {
  font-size: 0.72rem;
  font-weight: 600;
  line-height: 1.25;
  color: var(--text-muted);
}

.student-dashboard-curriculum {
  margin-bottom: 0;
  padding: 0.75rem;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  background: color-mix(in srgb, var(--bg-main) 88%, var(--bg-card));
}

.student-curriculum-label {
  margin: 0 0 0.65rem;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
}

.form-select {
  display: block;
  width: 100%;
  margin-bottom: 0.55rem;
  padding: 10px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  background: var(--bg-main);
  color: var(--text-main);
  font: inherit;
  font-size: 0.88rem;
  font-weight: 600;
  line-height: 1.3;
  cursor: pointer;
  outline: none;
  -webkit-tap-highlight-color: transparent;
  appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, var(--text-muted) 50%),
    linear-gradient(135deg, var(--text-muted) 50%, transparent 50%);
  background-position: calc(100% - 16px) calc(50% - 2px), calc(100% - 11px) calc(50% - 2px);
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
  padding-right: 2rem;
}

.form-select:last-child {
  margin-bottom: 0;
}

.form-select:focus {
  border-color: var(--accent-fizki);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent-fizki) 28%, transparent);
}

[data-theme="light"] .form-select {
  border-color: rgba(0, 0, 0, 0.12);
}

.student-dashboard-join {
  margin-top: 0.85rem;
  padding: 0.75rem;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  background: color-mix(in srgb, var(--bg-main) 88%, var(--bg-card));
}

.student-join-label {
  margin: 0 0 0.65rem;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
}

.student-join-row {
  display: flex;
  gap: 0.5rem;
  align-items: stretch;
}

.student-join-input {
  flex: 1;
  min-width: 0;
  padding: 10px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  background: var(--bg-main);
  color: var(--text-main);
  font: inherit;
  font-size: 0.88rem;
  font-weight: 600;
  line-height: 1.3;
  outline: none;
}

.student-join-input::placeholder {
  color: var(--text-muted);
  font-weight: 500;
}

.student-join-input:focus {
  border-color: var(--accent-fizki);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent-fizki) 28%, transparent);
}

[data-theme="light"] .student-join-input {
  border-color: rgba(0, 0, 0, 0.12);
}

.student-join-btn {
  flex-shrink: 0;
  padding: 10px 1rem;
  border: none;
  border-radius: 8px;
  background: var(--accent-fizki);
  color: #000;
  font: inherit;
  font-size: 0.88rem;
  font-weight: 800;
  line-height: 1.3;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s ease;
  -webkit-tap-highlight-color: transparent;
}

.student-join-btn:hover {
  background: var(--accent-fizki-hover);
}

.student-join-btn:focus-visible {
  outline: 2px solid var(--accent-fizki);
  outline-offset: 2px;
}

.student-curriculum-value {
  margin: 0;
  font-size: 0.88rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--text-main);
}

.student-dashboard-change {
  width: 100%;
  padding: 0.55rem 0.85rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: var(--bg-main);
  color: var(--text-main);
  font: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
  -webkit-tap-highlight-color: transparent;
}

.student-dashboard-change:hover {
  border-color: var(--accent-fizki);
  background: var(--bg-card-hover);
}

.student-dashboard-change:focus-visible {
  outline: 2px solid var(--accent-fizki);
  outline-offset: 2px;
}

.teacher-dashboard-panel {
  max-width: 24rem;
  margin: 0;
  padding: 1rem;
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  box-shadow: 0 16px 48px color-mix(in srgb, #000 35%, transparent);
}

[data-theme="light"] .teacher-dashboard-panel {
  box-shadow: 0 16px 48px rgba(15, 23, 42, 0.1);
}

.teacher-profile-hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 0.55rem;
  margin-bottom: 1rem;
  padding-top: 0.25rem;
}

.teacher-profile-avatar {
  width: 70px;
  height: 70px;
  border-radius: 50%;
  object-fit: cover;
  display: block;
  border: 2px solid color-mix(in srgb, var(--accent-fizki) 35%, var(--border-color));
  box-shadow: 0 4px 16px color-mix(in srgb, #0d8abc 22%, transparent);
}

.teacher-profile-name {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 800;
  line-height: 1.25;
  color: var(--text-main);
}

.teacher-profile-role {
  display: inline-flex;
  align-items: center;
  padding: 0.22rem 0.55rem;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, #1e3a5f 45%, var(--border-color));
  background: color-mix(in srgb, #1e3a5f 16%, var(--bg-main));
  font-size: 0.75rem;
  font-weight: 700;
  line-height: 1.2;
  white-space: nowrap;
  color: var(--text-main);
}

.teacher-mode-switch {
  display: flex;
  width: 100%;
  max-width: 16rem;
  gap: 0.35rem;
  margin-top: 0.15rem;
}

.btn-mode {
  flex: 1 1 0;
  padding: 0.42rem 0.65rem;
  border: 1px solid var(--border-color);
  border-radius: 999px;
  background: var(--bg-main);
  color: var(--text-main);
  font: inherit;
  font-size: 0.78rem;
  font-weight: 700;
  line-height: 1.2;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
  -webkit-tap-highlight-color: transparent;
}

.btn-mode:hover {
  border-color: color-mix(in srgb, var(--accent-fizki) 45%, var(--border-color));
  background: var(--bg-card-hover);
}

.btn-mode:focus-visible {
  outline: 2px solid var(--accent-fizki);
  outline-offset: 2px;
}

.btn-mode.active {
  background: var(--accent-fizki) !important;
  color: black !important;
}

.t-cal-week-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.65rem;
}

.calendar-nav {
  flex-wrap: wrap;
}

.btn-cal-edit-availability {
  flex: 1 1 100%;
  margin-top: 0.15rem;
  padding: 0.45rem 0.65rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: var(--bg-main);
  color: var(--text-main);
  font: inherit;
  font-size: 0.78rem;
  font-weight: 700;
  line-height: 1.3;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
  -webkit-tap-highlight-color: transparent;
}

.btn-cal-edit-availability:hover {
  border-color: #0ea5e9;
  background: rgba(14, 165, 233, 0.08);
}

.btn-cal-edit-availability.active,
.btn-cal-edit-availability[aria-pressed="true"] {
  border-color: #0ea5e9;
  background: rgba(14, 165, 233, 0.14);
  color: #0ea5e9;
}

.btn-cal-edit-availability:focus-visible {
  outline: 2px solid #0ea5e9;
  outline-offset: 2px;
}

.t-cal-week-btn {
  flex-shrink: 0;
  width: 2rem;
  height: 2rem;
  padding: 0;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: var(--bg-main);
  color: var(--text-main);
  font: inherit;
  font-size: 1.1rem;
  line-height: 1;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
  -webkit-tap-highlight-color: transparent;
}

.t-cal-week-btn:hover {
  border-color: var(--accent-fizki);
  background: var(--bg-card-hover);
}

.t-cal-week-btn:focus-visible {
  outline: 2px solid var(--accent-fizki);
  outline-offset: 2px;
}

.t-cal-week-label {
  flex: 1 1 auto;
  text-align: center;
  font-size: 0.82rem;
  font-weight: 800;
  line-height: 1.3;
  color: var(--text-main);
}

.calendar-grid {
  display: grid;
  grid-template-columns: 2.75rem repeat(7, minmax(0, 1fr));
  gap: 1px;
  font-size: 0.7rem;
  color: var(--text-muted);
  border: 1px solid rgba(0, 0, 0, 0.2);
  border-radius: 6px;
  overflow: hidden;
}

.cal-header {
  background: #000;
  padding: 8px 0;
  text-align: center;
  font-weight: bold;
  color: white;
  line-height: 1.25;
}

.cal-header .cal-date {
  display: block;
  font-size: 0.65rem;
  font-weight: 700;
  opacity: 0.85;
}

.cal-corner {
  background: #000;
}

.cal-time {
  background: #000;
  padding: 8px 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.65rem;
  line-height: 1.2;
  display: flex;
  align-items: center;
  justify-content: center;
}

.cal-cell {
  background: var(--bg-card);
  padding: 8px 4px;
  min-height: 40px;
  border: 1px solid rgba(0, 0, 0, 0.2);
  cursor: pointer;
  font: inherit;
  -webkit-tap-highlight-color: transparent;
  transition: background 0.12s ease, color 0.12s ease;
}

.cal-cell:hover:not(.booked):not(.booked-red) {
  background: var(--bg-card-hover);
}

.cal-cell:focus-visible {
  outline: 2px solid var(--accent-fizki);
  outline-offset: -2px;
  z-index: 1;
}

.cal-cell.booked,
.cal-slot.booked {
  background: var(--status-good);
  color: white;
  font-weight: bold;
  font-size: 0.65rem;
  padding: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.cal-cell.booked-red {
  background: var(--status-critical);
  color: white;
  font-weight: bold;
}

.cal-slot.available {
  border: 2px dashed #0ea5e9 !important;
  background: rgba(14, 165, 233, 0.1) !important;
  color: #0ea5e9;
}

.cal-slot.available::after {
  content: "✓";
  display: block;
  font-size: 0.6rem;
}

.cal-cell-name {
  display: block;
  font-size: 0.62rem;
  font-weight: 700;
  line-height: 1.15;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.lesson-detail-panel {
  max-width: 20rem;
  padding: 1.25rem 1.15rem 1.15rem;
  text-align: center;
}

.lesson-detail-status {
  margin: 0 0 0.35rem;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.lesson-detail-student {
  margin: 0 0 0.25rem;
  font-size: 1.35rem;
  font-weight: 800;
  line-height: 1.25;
  color: var(--text-main);
}

.lesson-detail-slot {
  margin: 0 0 1rem;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.lesson-detail-reschedule {
  display: block;
  width: 100%;
  margin: 0 0 0.75rem;
  padding: 0.65rem 1rem;
  border: none;
  border-radius: 999px;
  background: var(--status-good);
  color: #fff;
  font: inherit;
  font-size: 0.88rem;
  font-weight: 800;
  line-height: 1.2;
  cursor: pointer;
  transition: filter 0.15s ease, transform 0.1s ease;
  -webkit-tap-highlight-color: transparent;
}

.lesson-detail-reschedule:hover {
  filter: brightness(1.06);
}

.lesson-detail-reschedule:focus-visible {
  outline: 2px solid var(--accent-fizki);
  outline-offset: 2px;
}

.lesson-detail-no-show {
  display: inline;
  padding: 0;
  border: none;
  background: none;
  color: var(--text-muted);
  font: inherit;
  font-size: 0.78rem;
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 2px;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.lesson-detail-no-show:hover {
  color: var(--text-main);
}

.lesson-detail-no-show:focus-visible {
  outline: 2px solid var(--accent-fizki);
  outline-offset: 2px;
}

.t-cal-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem 1rem;
  margin: 0.65rem 0 0;
  font-size: 0.72rem;
  color: var(--text-muted);
}

.t-cal-legend-item {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.t-cal-legend-swatch {
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 3px;
  border: 1px solid rgba(0, 0, 0, 0.15);
}

.t-cal-legend-swatch--open {
  background: var(--bg-card);
}

.t-cal-legend-swatch--booked {
  background: var(--status-good);
}

.t-cal-legend-swatch--blocked {
  background: var(--status-critical);
}

.teacher-classes-heading {
  margin: 0;
  font-size: 0.88rem;
  font-weight: 800;
  line-height: 1.3;
  color: var(--text-main);
}

.teacher-classes-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.65rem;
  margin-bottom: 0.65rem;
}

.teacher-new-class-btn {
  flex-shrink: 0;
  padding: 0.4rem 0.7rem;
  border: 1px solid color-mix(in srgb, var(--accent-fizki) 55%, var(--border-color));
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent-fizki) 14%, var(--bg-main));
  color: var(--text-main);
  font: inherit;
  font-size: 0.78rem;
  font-weight: 700;
  line-height: 1.2;
  cursor: pointer;
  white-space: nowrap;
  transition: border-color 0.15s ease, background 0.15s ease;
  -webkit-tap-highlight-color: transparent;
}

.teacher-new-class-btn:hover {
  border-color: var(--accent-fizki);
  background: color-mix(in srgb, var(--accent-fizki) 24%, var(--bg-main));
}

.teacher-new-class-btn:focus-visible {
  outline: 2px solid var(--accent-fizki);
  outline-offset: 2px;
}

.teacher-classes-manage {
  margin-top: 0.85rem;
  padding: 12px;
  border-radius: 8px;
  background: var(--bg-main);
  border: 1px solid var(--border-color);
}

.teacher-classes-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.t-view {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.t-class-nav-btn {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--bg-main);
  border: 1px solid rgba(255, 255, 255, 0.05);
  padding: 12px;
  border-radius: 8px;
  width: 100%;
  text-align: left;
  cursor: pointer;
  transition: background 0.2s;
  color: var(--text-main);
  font: inherit;
  -webkit-tap-highlight-color: transparent;
}

.t-class-nav-btn:hover {
  background: rgba(255, 255, 255, 0.1);
}

[data-theme="light"] .t-class-nav-btn {
  border-color: rgba(0, 0, 0, 0.08);
}

[data-theme="light"] .t-class-nav-btn:hover {
  background: rgba(0, 0, 0, 0.05);
}

.t-class-nav-btn:focus-visible {
  outline: 2px solid var(--accent-fizki);
  outline-offset: 2px;
}

.t-class-nav-btn strong {
  font-size: 0.88rem;
  font-weight: 800;
}

.t-class-meta {
  display: block;
  margin-top: 0.15rem;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-muted);
}

.t-nav-chevron {
  flex-shrink: 0;
  font-size: 1.1rem;
  line-height: 1;
  color: var(--text-muted);
}

.t-detail-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.25rem;
}

.t-detail-back {
  flex-shrink: 0;
  padding: 0.35rem 0.5rem;
  border: none;
  border-radius: 6px;
  background: transparent;
  color: var(--accent-fizki);
  font: inherit;
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.t-detail-back:hover {
  background: color-mix(in srgb, var(--accent-fizki) 12%, transparent);
}

.t-detail-title {
  flex: 1;
  margin: 0;
  font-size: 0.95rem;
  font-weight: 800;
  text-align: center;
  line-height: 1.25;
  color: var(--text-main);
}

.t-detail-code-btn {
  flex-shrink: 0;
  padding: 0.35rem 0.55rem;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background: var(--bg-main);
  color: var(--text-main);
  font: inherit;
  font-size: 0.72rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  -webkit-tap-highlight-color: transparent;
}

.t-detail-code-btn:hover {
  border-color: var(--accent-fizki);
}

.t-detail-hint {
  margin: 0;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
}

.t-students-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.t-class-code {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-left: 8px;
  background: rgba(0, 0, 0, 0.2);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-weight: 700;
}

[data-theme="light"] .t-class-code {
  background: rgba(0, 0, 0, 0.06);
}

.t-chevron {
  font-size: 0.7rem;
  color: var(--text-muted);
  transition: transform 0.3s;
}

.t-student-header.is-open .t-chevron {
  transform: rotate(180deg);
}

.t-student-group {
  background: rgba(0, 0, 0, 0.2);
  border-radius: 6px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.02);
}

[data-theme="light"] .t-student-group {
  background: rgba(0, 0, 0, 0.04);
  border-color: rgba(0, 0, 0, 0.06);
}

.t-student-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s;
  -webkit-tap-highlight-color: transparent;
}

.t-student-header:hover {
  background: rgba(255, 255, 255, 0.05);
}

[data-theme="light"] .t-student-header:hover {
  background: rgba(0, 0, 0, 0.04);
}

.t-student-header-right {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.t-student-body {
  padding: 8px 10px 10px 10px;
  background: rgba(0, 0, 0, 0.3);
  border-top: 1px solid rgba(255, 255, 255, 0.02);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

[data-theme="light"] .t-student-body {
  background: rgba(0, 0, 0, 0.05);
  border-top-color: rgba(0, 0, 0, 0.06);
}

.t-micro-stat {
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.teacher-class-empty {
  margin: 0.5rem 0 0;
  font-size: 0.78rem;
  font-weight: 600;
  font-style: italic;
  color: var(--text-muted);
  text-align: center;
}

.teacher-analytics {
  margin-bottom: 0;
  background: var(--bg-card);
  padding: 10px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.analytics-title {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0;
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.analytics-item {
  margin-bottom: 10px;
}

.analytics-item:last-child {
  margin-bottom: 0;
}

.analytics-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  margin-bottom: 4px;
  font-weight: 500;
}

.analytics-track {
  width: 100%;
  height: 6px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
  overflow: hidden;
}

.analytics-fill {
  height: 100%;
  border-radius: 4px;
}

.bg-critical {
  background: var(--status-critical);
}

.bg-warning {
  background: var(--status-warning);
}

.bg-good {
  background: var(--status-good);
}

.text-critical {
  color: var(--status-critical);
}

.text-warning {
  color: var(--status-warning);
}

.text-good {
  color: var(--status-good);
}

.teacher-task-tools {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.65rem;
  flex-wrap: wrap;
  margin: 0 1rem 0.65rem;
  padding: 0.65rem 0.75rem;
  border-radius: 10px;
  border: 1px solid color-mix(in srgb, #1e3a5f 45%, var(--border-color));
  background: color-mix(in srgb, #1e3a5f 18%, var(--bg-card));
}

[data-theme="light"] .teacher-task-tools {
  border-color: #bfdbfe;
  background: #eff6ff;
}

.teacher-task-tools-label {
  margin: 0;
  flex: 1 1 auto;
  min-width: 10rem;
  font-size: 0.78rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--text-main);
}

.teacher-task-tools-btn {
  flex-shrink: 0;
  padding: 0.45rem 0.75rem;
  border: 1px solid color-mix(in srgb, var(--accent-fizki) 55%, var(--border-color));
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent-fizki) 14%, var(--bg-main));
  color: var(--text-main);
  font: inherit;
  font-size: 0.78rem;
  font-weight: 700;
  line-height: 1.2;
  cursor: pointer;
  white-space: nowrap;
  transition: border-color 0.15s ease, background 0.15s ease;
  -webkit-tap-highlight-color: transparent;
}

.teacher-task-tools-btn:hover {
  border-color: var(--accent-fizki);
  background: color-mix(in srgb, var(--accent-fizki) 24%, var(--bg-main));
}

.teacher-task-tools-btn:focus-visible {
  outline: 2px solid var(--accent-fizki);
  outline-offset: 2px;
}

.quiz-creator-panel {
  max-width: 24rem;
  max-height: min(92vh, 36rem);
  padding: 1rem;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.quiz-creator-heading {
  flex-shrink: 0;
  margin: 0 2rem 0.75rem 0;
  font-size: 1.05rem;
  font-weight: 800;
  line-height: 1.3;
  color: var(--text-main);
}

.quiz-creator-intro {
  flex-shrink: 0;
  margin: 0 0 0.75rem;
  font-size: 0.85rem;
  line-height: 1.4;
  color: var(--text-muted);
}

.quiz-creator-task-list {
  list-style: none;
  margin: 0 0 1rem;
  padding: 0.15rem 0.35rem 0.15rem 0;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  flex: 1 1 auto;
  min-height: 0;
  max-height: 14rem;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-gutter: stable;
}

.quiz-creator-footer {
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.quiz-creator-task-item {
  margin: 0;
}

.quiz-creator-task-label {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.65rem 0.75rem;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background: var(--bg-main);
  font-size: 0.85rem;
  font-weight: 600;
  line-height: 1.35;
  color: var(--text-main);
  cursor: pointer;
}

.quiz-creator-task-text {
  flex: 1 1 auto;
  min-width: 0;
}

.quiz-creator-difficulty {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.1rem;
  height: 1.1rem;
}

.quiz-creator-difficulty-dot {
  display: block;
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--text-main) 12%, transparent);
}

.quiz-creator-difficulty--easy .quiz-creator-difficulty-dot {
  background: var(--status-good);
}

.quiz-creator-difficulty--medium .quiz-creator-difficulty-dot {
  background: var(--status-warning);
}

.quiz-creator-difficulty--hard .quiz-creator-difficulty-dot {
  background: var(--status-critical);
}

.quiz-creator-task-label:has(.quiz-creator-checkbox:checked) {
  border-color: color-mix(in srgb, var(--accent-fizki) 45%, var(--border-color));
  background: color-mix(in srgb, var(--accent-fizki) 10%, var(--bg-main));
}

.quiz-creator-checkbox {
  flex-shrink: 0;
  width: 1.05rem;
  height: 1.05rem;
  margin-top: 0;
  accent-color: var(--accent-fizki);
  cursor: pointer;
}

.quiz-creator-class-field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.quiz-creator-class-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.quiz-creator-class-select {
  margin-bottom: 0;
}

.quiz-creator-advanced {
  margin-top: 0.15rem;
}

.quiz-creator-advanced-details {
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: color-mix(in srgb, var(--bg-card) 55%, var(--bg-main));
  overflow: hidden;
}

.quiz-creator-advanced-summary {
  padding: 0.55rem 0.75rem;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  cursor: pointer;
  list-style: none;
  user-select: none;
}

.quiz-creator-advanced-summary::-webkit-details-marker {
  display: none;
}

.quiz-creator-advanced-summary::after {
  content: "▾";
  float: right;
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: transform 0.15s ease;
}

.quiz-creator-advanced-details[open] .quiz-creator-advanced-summary::after {
  transform: rotate(180deg);
}

.quiz-creator-advanced-body {
  padding: 0 0.75rem 0.65rem;
}

.quiz-creator-advanced-option {
  display: flex;
  align-items: flex-start;
  gap: 0.55rem;
  font-size: 0.84rem;
  font-weight: 600;
  line-height: 1.35;
  color: var(--text-main);
  cursor: pointer;
}

.quiz-creator-shuffle-checkbox {
  flex-shrink: 0;
  width: 1.05rem;
  height: 1.05rem;
  margin-top: 0.12rem;
  accent-color: var(--accent-fizki);
  cursor: pointer;
}

.quiz-creator-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}

.quiz-creator-preview {
  padding: 0.75rem 0.65rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: color-mix(in srgb, var(--bg-card) 70%, var(--bg-main));
  color: var(--text-main);
  font: inherit;
  font-size: 0.82rem;
  font-weight: 700;
  line-height: 1.3;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
  -webkit-tap-highlight-color: transparent;
}

.quiz-creator-preview:hover {
  background: color-mix(in srgb, var(--bg-card) 90%, var(--text-main));
  border-color: color-mix(in srgb, var(--text-muted) 35%, var(--border-color));
}

.quiz-creator-preview:focus-visible {
  outline: 2px solid var(--accent-fizki);
  outline-offset: 2px;
}

.quiz-creator-submit {
  width: auto;
  padding: 0.75rem 1rem;
  border: none;
  border-radius: 8px;
  background: var(--accent-fizki);
  color: #000;
  font: inherit;
  font-size: 0.92rem;
  font-weight: 800;
  line-height: 1.3;
  cursor: pointer;
  transition: background 0.15s ease;
  -webkit-tap-highlight-color: transparent;
}

.quiz-creator-submit:hover {
  background: var(--accent-fizki-hover);
}

.quiz-creator-submit:focus-visible {
  outline: 2px solid var(--accent-fizki);
  outline-offset: 2px;
}

.quiz-success-toast {
  position: fixed;
  left: 50%;
  bottom: calc(1rem + env(safe-area-inset-bottom, 0px));
  z-index: 1100;
  transform: translateX(-50%);
  max-width: min(22rem, calc(100vw - 2rem));
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  background: #15803d;
  color: #f0fdf4;
  font-size: 0.88rem;
  font-weight: 600;
  line-height: 1.35;
  text-align: center;
  box-shadow: 0 10px 30px rgba(21, 128, 61, 0.35);
}

.onboarding {
  padding: 0.5rem 0 1rem;
}

.onboarding-title {
  margin: 0 0 0.35rem;
  font-size: 1.15rem;
  font-weight: 700;
  text-align: center;
}

.onboarding-sub {
  margin: 0 0 1rem;
  font-size: 0.88rem;
  color: var(--text-muted);
  text-align: center;
  line-height: 1.35;
}

.onboarding-options {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.onboarding-option {
  width: 100%;
  padding: 0.85rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: var(--bg-card);
  color: var(--text-main);
  font: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
  -webkit-tap-highlight-color: transparent;
}

.onboarding-option:hover {
  border-color: var(--accent-fizki);
  background: var(--bg-card-hover);
}

.onboarding-option:focus-visible {
  outline: 2px solid var(--accent-fizki);
  outline-offset: 2px;
}

.app-logo {
  display: block;
  height: 2.15rem;
  width: auto;
  max-width: min(100%, 9.5rem);
}

.app-logo--theme-light {
  display: none;
}

[data-theme="light"] .app-logo--theme-dark {
  display: none;
}

[data-theme="light"] .app-logo--theme-light {
  display: block;
}

.app {
  margin: 0;
  padding: 0.5rem 1rem 1rem;
  flex: 1;
  width: 100%;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.app-footer {
  flex-shrink: 0;
  max-width: 28rem;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.app-footer-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
}

.pwa-install-hint {
  margin: 0 auto;
  padding: 0.5rem 0.75rem;
  font-size: 0.8rem;
  line-height: 1.35;
  color: var(--text-muted);
  text-align: center;
  border: 1px dashed var(--border-color);
  border-radius: 8px;
  max-width: 22rem;
}

.btn-theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  margin: 0;
  padding: 0.45rem 0.85rem;
  border: 1px solid var(--border-color);
  border-radius: 999px;
  background: var(--bg-card);
  color: var(--text-muted);
  font: inherit;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
  -webkit-tap-highlight-color: transparent;
}

.btn-theme-toggle:hover {
  color: var(--text-main);
  border-color: var(--accent-fizki);
}

.btn-theme-toggle:focus-visible {
  outline: 2px solid var(--accent-fizki);
  outline-offset: 2px;
}

.teacher-modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 0;
}

.teacher-modal[hidden] {
  display: none;
}

.teacher-modal:not([hidden]) .teacher-modal-panel {
  animation: fadeIn 0.2s ease-out;
}

.teacher-modal-panel {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  width: 100%;
  max-width: 28rem;
  max-height: min(85dvh, 640px);
  margin: 0 auto;
  border-radius: var(--radius) var(--radius) 0 0;
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  border-bottom: none;
  box-shadow: 0 -12px 40px color-mix(in srgb, #000 25%, transparent);
}

.teacher-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 1rem 1rem 0.75rem;
  border-bottom: 1px solid var(--border-color);
}

.teacher-modal-header h2 {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 700;
}

.teacher-modal-close {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  padding: 0;
  border: 1px solid var(--border-color);
  border-radius: 999px;
  background: var(--bg-card);
  color: var(--text-muted);
  font: inherit;
  font-size: 1.25rem;
  line-height: 1;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease;
  -webkit-tap-highlight-color: transparent;
}

.teacher-modal-close:hover {
  color: var(--text-main);
  border-color: var(--accent-fizki);
}

.teacher-modal-close:focus-visible {
  outline: 2px solid var(--accent-fizki);
  outline-offset: 2px;
}

.teacher-modal-body {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: 1rem;
}

.teacher-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 16px;
}

.teacher-card:last-child {
  margin-bottom: 0;
}

.teacher-card-main {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: flex-start;
}

.teacher-photo {
  flex-shrink: 0;
}

.teacher-avatar {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  object-fit: cover;
  display: block;
}

.teacher-info {
  flex: 1;
  min-width: min(100%, 12rem);
}

.teacher-name {
  margin: 0 0 0.35rem;
  font-size: 1rem;
  font-weight: 700;
}

.teacher-bio {
  margin: 0 0 0.5rem;
  font-size: 0.88rem;
  line-height: 1.35;
  color: var(--text-muted);
}

.teacher-price {
  margin: 0 0 0.5rem;
  font-size: 0.95rem;
}

.teacher-levels {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.teacher-level-badge {
  display: inline-block;
  padding: 4px 8px;
  border-radius: 12px;
  font-size: 0.8rem;
  font-weight: 600;
  background: color-mix(in srgb, #1e3a5f 90%, var(--bg-card));
  color: #c7d9f0;
}

[data-theme="light"] .teacher-level-badge {
  background: #dbeafe;
  color: #1e3a8a;
}

.teacher-toggle-slots {
  width: 100%;
  margin-top: 0.75rem;
  padding: 0.55rem 0.85rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--bg-card) 92%, var(--bg-main));
  color: var(--text-main);
  font: inherit;
  font-size: 0.88rem;
  font-weight: 600;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
  -webkit-tap-highlight-color: transparent;
}

.teacher-toggle-slots:hover {
  border-color: var(--accent-fizki);
  background: var(--bg-card-hover);
}

.teacher-toggle-slots:focus-visible {
  outline: 2px solid var(--accent-fizki);
  outline-offset: 2px;
}

.teacher-calendar {
  display: none;
}

.teacher-card.show-calendar .teacher-calendar {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
  gap: 8px;
  margin-top: 12px;
}

.time-slot-btn {
  padding: 0.5rem 0.35rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: var(--bg-main);
  color: var(--text-main);
  font: inherit;
  font-size: 0.82rem;
  font-weight: 600;
  line-height: 1.2;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease, transform 0.1s ease, box-shadow 0.15s ease;
  -webkit-tap-highlight-color: transparent;
}

.time-slot-btn:hover {
  border-color: var(--accent-fizki);
  background: var(--bg-card-hover);
  box-shadow: 0 2px 8px color-mix(in srgb, var(--accent-fizki) 18%, transparent);
}

.time-slot-btn:active {
  transform: scale(0.96);
  background: color-mix(in srgb, var(--accent-fizki) 22%, var(--bg-card));
  border-color: var(--accent-fizki);
}

.time-slot-btn:focus-visible {
  outline: 2px solid var(--accent-fizki);
  outline-offset: 2px;
}

@media (min-width: 480px) {
  .teacher-modal {
    align-items: center;
    padding: 1rem;
  }

  .teacher-modal-panel {
    border-radius: var(--radius);
    border-bottom: 1px solid var(--border-color);
    max-height: min(80dvh, 640px);
  }
}

/* Stan startowy aplikacji (boot / fetch JSON) */
.app-loading,
.app-boot-error {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 1rem;
  padding: 2rem 1rem;
  min-height: 60dvh;
  color: var(--text-main);
}

.app-boot-error .sub {
  margin: 0;
  max-width: 22rem;
}

/* Podsumowanie quizu fiszek */
.flash-complete-scene {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 1.25rem;
  padding: 2rem 1rem;
  min-height: 50dvh;
}

.flash-complete-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 0;
}

h1 {
  font-size: 1.35rem;
  font-weight: 700;
  margin: 0 0 0.35rem;
  letter-spacing: -0.02em;
}

.sub {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin: 0 0 1.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.1rem;
  border: none;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  background: var(--accent-fizki);
  color: var(--accent-on-fizki);
  width: 100%;
  transition: background 0.15s ease, transform 0.1s ease;
}

.btn:hover {
  background: var(--accent-fizki-hover);
}

.btn:active {
  transform: scale(0.98);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-main);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
}

.btn-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.65rem;
  margin-top: auto;
  padding-top: 1rem;
}

/* Flash-study: przewijana treść + stały pasek Wstecz/Dalej */
.app:has(.flash-study) {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  padding-bottom: 0;
}

.flash-study {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
}

.flash-study-body {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding-top: 20px;
  padding-bottom: 0.35rem;
}

.flash-study-progress {
  margin-bottom: 0.5rem;
}

.flash-progress-bar {
  height: 4px;
  margin-bottom: 0.75rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  overflow: hidden;
}

[data-theme="light"] .flash-progress-bar {
  background: rgba(0, 0, 0, 0.08);
}

.flash-progress-fill {
  height: 100%;
  width: 0%;
  border-radius: inherit;
  background: var(--accent-fizki);
  transition: width 0.25s ease;
}

.flash-card-container {
  flex: 1;
  min-height: 0;
}

.flash-nav {
  flex-shrink: 0;
  position: sticky;
  bottom: 0;
  z-index: 30;
  margin: 0 -1rem;
  padding: 0.65rem 1rem calc(0.65rem + env(safe-area-inset-bottom, 0px));
  background: var(--bg-main);
  border-top: 1px solid var(--border-color);
  box-shadow: 0 -8px 24px color-mix(in srgb, var(--bg-main) 25%, transparent);
}

[data-theme="light"] .flash-nav {
  box-shadow: 0 -6px 20px rgba(15, 23, 42, 0.08);
}

.flash-nav-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.65rem;
  max-width: 28rem;
  margin: 0 auto;
}

.flash-nav-row .btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-muted);
  border: 1px solid rgba(255, 255, 255, 0.08);
  font-weight: 600;
}

.flash-nav-row .btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-main);
  border-color: rgba(255, 255, 255, 0.12);
}

[data-theme="light"] .flash-nav-row .btn-secondary {
  background: rgba(0, 0, 0, 0.04);
  border-color: rgba(0, 0, 0, 0.08);
}

[data-theme="light"] .flash-nav-row .btn-secondary:hover {
  background: rgba(0, 0, 0, 0.07);
}

.progress {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.scene {
  perspective: 1200px;
  flex: 1;
  display: flex;
  align-items: center;
  min-height: 14rem;
}

.quiz-scene {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.quiz-card {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
  background: var(--card-front);
  border-radius: var(--radius);
  padding: 1rem 1rem 1.1rem;
  box-shadow: var(--shadow);
  border: 1px solid var(--border-color);
}

.quiz-card--flip {
  gap: 0.75rem;
}

/* Stała wysokość — po ujawnieniu pełnej fiszki przyciski opcji nie „skaczą”. */
.quiz-prompt-slot {
  flex-shrink: 0;
  box-sizing: border-box;
  height: clamp(12.5rem, 36dvh, 18.5rem);
  min-height: clamp(12.5rem, 36dvh, 18.5rem);
  overflow: hidden;
}

.quiz-prompt-question {
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 0.25rem 0.15rem;
  box-sizing: border-box;
}

.quiz-flip-face {
  height: 100%;
  box-sizing: border-box;
  padding: 0.9rem 0.8rem;
  border-radius: 12px;
  background: var(--card-back);
  border: 1px solid var(--border-color);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.quiz-card--flip .label {
  font-size: 0.78rem;
  margin-bottom: 0.45rem;
}

.quiz-flip-topic {
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 0.55rem;
  color: var(--text-main);
  line-height: 1.35;
}

.quiz-flip-formula {
  font-size: 1.55rem;
  margin: 0 0 0.45rem;
}

.quiz-flip-formula .katex {
  font-size: 1.65em;
}

.quiz-flip-face .symbol-legend {
  margin-top: 0.35rem;
  font-size: 0.92rem;
}

.quiz-flip-face .symbol-legend-row {
  font-size: 0.9rem;
}

.quiz-flip-face .symbol-legend-tex .katex {
  font-size: 1.05em;
}

.quiz-question-title {
  font-size: 1.28rem;
  font-weight: 700;
  margin: 0;
  line-height: 1.35;
  color: var(--text-main);
}

.quiz-head-symbol {
  font-weight: 600;
}

.quiz-head-symbol .katex {
  font-size: 1em;
}

.quiz-options {
  flex: 1;
  display: grid;
  gap: 0.55rem;
  min-height: 0;
}

/* Krótkie wzory: 2×2 — cztery opcje w jednym „rzucie oka” */
.quiz-options--grid2 {
  grid-template-columns: 1fr 1fr;
  grid-template-rows: repeat(2, minmax(3.25rem, 1fr));
}

/* Długie / złożone: jedna kolumna */
.quiz-options--stack {
  grid-template-columns: minmax(0, 1fr);
  grid-template-rows: repeat(4, minmax(4.15rem, auto));
}

.quiz-card--flip .quiz-options--stack {
  flex: 1 1 auto;
  min-height: 0;
}

@media (max-width: 360px) {
  .quiz-options--grid2 {
    grid-template-columns: 1fr;
    grid-template-rows: repeat(4, minmax(3.25rem, 1fr));
  }
}

.quiz-option {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 0;
  min-width: 0;
  max-width: 100%;
  width: 100%;
  box-sizing: border-box;
  margin: 0;
  padding: 0.55rem 0.7rem;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  box-shadow:
    0 4px 6px -1px rgba(0, 0, 0, 0.3),
    0 2px 4px -1px rgba(0, 0, 0, 0.2);
  cursor: pointer;
  text-align: center;
  font: inherit;
  overflow: hidden;
  -webkit-tap-highlight-color: transparent;
  transition:
    transform 0.1s ease,
    box-shadow 0.1s ease,
    border-color 0.15s ease,
    background 0.15s ease;
}

.quiz-option:hover:not(:disabled) {
  border-color: var(--accent-fizki);
  box-shadow:
    0 6px 10px -2px rgba(0, 0, 0, 0.35),
    0 3px 6px -1px rgba(0, 0, 0, 0.22);
}

.quiz-option:active:not(:disabled) {
  transform: scale(0.98);
}

.quiz-option:disabled {
  cursor: default;
  opacity: 1;
}

.quiz-option--correct {
  border-color: var(--status-correct);
  background: color-mix(in srgb, var(--status-correct) 18%, var(--bg-card));
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--status-correct) 40%, transparent);
}

.quiz-option--wrong-pick {
  border-color: var(--status-wrong);
  background: color-mix(in srgb, var(--status-wrong) 14%, var(--bg-card));
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--status-wrong) 35%, transparent);
}

.quiz-option-formula {
  margin: 0;
  flex: 1 1 auto;
  width: 100%;
  min-width: 0;
  max-width: 100%;
  overflow-x: hidden;
  overflow-y: visible;
  overflow-wrap: anywhere;
  word-break: break-word;
  white-space: normal;
  display: block;
  text-align: center;
  line-height: 1.35;
}

/* Większy KaTeX w przyciskach quizu fiszek */
.quiz-option .quiz-option-formula .katex {
  font-size: 1.45em;
  max-width: 100%;
  white-space: normal;
  overflow-wrap: anywhere;
}

.quiz-option .quiz-option-formula .katex-display {
  margin: 0;
  max-width: 100%;
  white-space: normal;
  overflow-wrap: anywhere;
}

.quiz-formula-stack {
  width: 100%;
  min-width: 0;
}

.quiz-formula-main {
  margin: 0;
}

.quiz-formula-hint {
  margin: 0.35rem 0 0;
  padding: 0 0.15rem;
  font-size: 0.82rem;
  line-height: 1.35;
  color: var(--text-muted);
  font-weight: 500;
}

.quiz-flip-formula-split .quiz-formula-main .katex {
  font-size: 1.65em;
}

.quiz-flip-formula-split .quiz-formula-hint {
  font-size: 0.9rem;
}

.quiz-formula-stack .quiz-formula-main + .quiz-formula-main,
.quiz-formula-stack .quiz-formula-main + .quiz-formula-hint,
.quiz-formula-stack .quiz-formula-hint {
  margin-top: 0.32rem;
}

.sheet-formula-stack .sheet-formula-body .katex {
  font-size: 0.95em;
}

.sheet-formula-stack .quiz-formula-main .katex {
  font-size: 0.95em;
}

/* Wzory z \\vec — wyraźniejsza kreska wektora i litera pod nią (KaTeX .mord.accent) */
.quiz-option.is-vector-distractor .katex .mord.accent,
.quiz-option.is-vector-distractor .katex .mord.accent .mord {
  font-weight: 700;
}

.quiz-option.is-vector-distractor .katex .mord.accent svg path {
  stroke: currentColor;
  stroke-width: 0.14em;
  paint-order: stroke fill;
}

.quiz-full-card {
  margin-top: 1rem;
  padding: 0.85rem 0.75rem;
  border-radius: 12px;
  background: var(--card-back);
  border: 1px solid var(--border-color);
}

.quiz-full-topic {
  font-size: 0.88rem;
  font-weight: 600;
  margin: 0 0 0.5rem;
  color: var(--text-main);
}

.card {
  width: 100%;
  min-height: 220px;
  cursor: pointer;
  border: none;
  background: transparent;
  padding: 0;
  text-align: left;
  -webkit-tap-highlight-color: transparent;
}

.card:focus-visible {
  outline: 3px solid var(--accent-fizki);
  outline-offset: 4px;
  border-radius: var(--radius);
}

.card-inner {
  position: relative;
  width: 100%;
  min-height: 220px;
  transition: transform 0.55s cubic-bezier(0.4, 0.2, 0.2, 1);
  transform-style: preserve-3d;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.card.flipped .card-inner {
  transform: rotateY(180deg);
}

.card-face {
  position: absolute;
  inset: 0;
  border-radius: var(--radius);
  padding: 1.25rem 1.1rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

.card-front {
  background: var(--card-front);
  border: 1px solid var(--border-color);
}

.card-back {
  background: var(--card-back);
  border: 1px solid var(--border-color);
  transform: rotateY(180deg);
  justify-content: flex-start;
  overflow-x: hidden;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.card-back .hint {
  margin-top: auto;
}

.card-back .formula {
  flex-shrink: 0;
}

.label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.card-title {
  font-size: 1.05rem;
  font-weight: 700;
  margin: 0 0 0.5rem;
}

.formula {
  font-size: 1.15rem;
  font-family: "Cambria Math", "Times New Roman", serif;
  margin: 0;
  word-break: break-word;
}

.formula .katex,
.answer-text .katex {
  font-size: 1.05em;
}

.formula-subheading {
  margin: 0.65rem 0 0.35rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  font-family: "Segoe UI", system-ui, sans-serif;
}

.formula-subheading:first-child {
  margin-top: 0;
}

.law-list li {
  font-family: "Segoe UI", system-ui, sans-serif;
  font-size: 0.95rem;
}

.formula-list .katex {
  font-size: 1.05em;
}

.formula .katex-display,
.answer-text .katex-display {
  margin: 0;
}

.task-q .katex {
  font-size: 0.98em;
}

.hint {
  margin-top: 0.85rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.intro-actions {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  margin-top: 0.5rem;
}

.flash-mode-row {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  margin-top: 0.5rem;
}

.flash-panel-minimal {
  padding: 0.35rem 0 0.75rem;
}

.flash-panel-title {
  margin: 0;
  font-size: 1.85rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--text-main);
}

.flash-panel-sub {
  margin: 0.45rem 0 0;
  font-size: 0.95rem;
  font-weight: 500;
  line-height: 1.45;
  color: var(--text-muted);
}

.flash-mode-btn {
  width: 100%;
  padding: 0.85rem 1rem;
  border-radius: 14px;
  font-size: 0.95rem;
  font-weight: 700;
}

.flash-pick-topic-btn {
  width: 100%;
  margin-top: 0.85rem;
  padding: 1.05rem 1.15rem;
  border: 2px solid var(--border-color);
  border-radius: 16px;
  background: var(--bg-card);
  color: var(--text-main);
  font: inherit;
  font-size: 1.02rem;
  font-weight: 800;
  line-height: 1.3;
  text-align: center;
  cursor: pointer;
  box-shadow: 0 3px 0 color-mix(in srgb, var(--border-color) 75%, transparent);
  transition: transform 0.12s ease, box-shadow 0.12s ease, border-color 0.15s ease, background 0.15s ease;
  -webkit-tap-highlight-color: transparent;
}

.flash-pick-topic-btn:hover {
  border-color: var(--accent-fizki);
  background: color-mix(in srgb, var(--accent-fizki) 8%, var(--bg-card));
}

.flash-pick-topic-btn:active {
  transform: translateY(2px);
  box-shadow: 0 1px 0 color-mix(in srgb, var(--border-color) 75%, transparent);
}

.flash-pick-topic-btn:focus-visible {
  outline: 2px solid var(--accent-fizki);
  outline-offset: 2px;
}

.flash-topic-modal-panel {
  max-width: 24rem;
  max-height: min(88vh, 32rem);
  padding: 1rem;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.flash-topic-modal-heading {
  margin: 0 2rem 0.75rem 0;
  font-size: 1.05rem;
  font-weight: 800;
  line-height: 1.3;
  color: var(--text-main);
}

.flash-topic-modal-body {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding-right: 0.2rem;
}

.flash-topic-modal-body .flash-topic-grid {
  margin-top: 0;
}

.flash-mode-row .btn:disabled,
.flash-mode-row .btn[disabled] {
  opacity: 0.45;
  cursor: not-allowed;
}

.flash-topic-heading {
  margin-top: 1rem;
}

.flash-topic-grid {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  margin-top: 0.35rem;
}

.flash-topic-tile {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0.45rem;
  width: 100%;
  box-sizing: border-box;
  text-align: left;
  padding: 0.75rem 0.95rem;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  font: inherit;
  color: var(--text-main);
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.flash-topic-tile:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-fizki);
}

.flash-topic-tile-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.65rem;
}

.flash-topic-tile-title {
  font-size: 0.95rem;
  font-weight: 700;
  line-height: 1.35;
  flex: 1;
  min-width: 0;
}

.flash-topic-tile-counts {
  flex-shrink: 0;
  font-size: 0.78rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--text-muted);
  white-space: nowrap;
}

.flash-topic-bar {
  height: 0.45rem;
  border-radius: 6px;
  width: 100%;
  overflow: hidden;
  background: linear-gradient(
    to right,
    var(--status-correct) 0%,
    var(--status-correct) var(--bar-p1, 0%),
    var(--status-wrong) var(--bar-p1, 0%),
    var(--status-wrong) var(--bar-p2, 0%),
    var(--status-new) var(--bar-p2, 0%),
    var(--status-new) 100%
  );
}

.flash-topic-tile-n {
  margin: 0;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-muted);
}

.top-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.top-bar h1,
.top-bar .top-bar-title {
  flex: 1;
  margin: 0;
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.btn-back {
  width: auto;
  padding: 0.5rem 0.75rem;
  font-size: 0.9rem;
}

.tabs {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: nowrap;
  gap: 0;
  margin: 0 0 1.25rem;
  border-radius: 12px;
  padding: 4px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  max-width: 100%;
  min-width: 0;
}

.tab-slider {
  position: absolute;
  z-index: 0;
  top: 0;
  bottom: 0;
  left: var(--slider-left, 0);
  width: var(--slider-width, 0);
  background: var(--accent-fizki);
  border-radius: inherit;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  pointer-events: none;
}

.tab {
  position: relative;
  z-index: 2;
  flex: 1 1 0;
  min-width: 0;
  border: none;
  border-radius: 10px;
  padding: 0.65rem 0.5rem;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  background: transparent;
  color: var(--text-muted);
  transition: color 0.3s ease;
  -webkit-tap-highlight-color: transparent;
  white-space: normal;
  line-height: 1.2;
  text-align: center;
}

.tab:hover {
  color: var(--text-main);
}

.tab[aria-selected="true"] {
  background: transparent !important;
  color: #000000;
  box-shadow: none;
}

.tab:focus-visible {
  outline: 2px solid var(--accent-fizki);
  outline-offset: 2px;
}

.tabs-main .tab {
  font-size: 0.82rem;
  padding: 0.58rem 0.3rem;
  line-height: 1.2;
}

.tabs-task-class {
  margin-bottom: 0.5rem;
}

.tabs-task-class .tab {
  font-size: 0.78rem;
  padding: 0.48rem 0.3rem;
  line-height: 1.2;
}

/* Lista zadań (`task-chapters`): drzewo programu — białe rozdziały, żółte podrozdziały. */
.task-chapters-toolbar {
  margin: 0 0 0.45rem;
}

.btn-link-back {
  display: inline-block;
  padding: 0;
  margin: 0;
  border: none;
  background: none;
  font: inherit;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent-fizki);
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

.btn-link-back:hover {
  color: var(--accent-fizki-hover);
}

.task-dzialy-heading {
  margin-top: 0.35rem;
}

.task-class-heading {
  margin: 0.85rem 0 0.5rem;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

.task-class-heading:first-child {
  margin-top: 0.25rem;
}

.task-curriculum-root .task-rozdzial {
  margin-bottom: 0.5rem;
}

.task-rozdzial--nested {
  margin-top: 0.35rem;
  margin-left: 0.35rem;
}

.task-rozdzial-head {
  display: flex;
  align-items: flex-start;
  gap: 0.45rem;
  width: 100%;
  box-sizing: border-box;
  text-align: left;
  padding: 0.85rem 1rem;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.task-rozdzial-head:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-fizki);
}

.task-rozdzial-chev {
  flex: 0 0 auto;
  font-size: 0.72rem;
  line-height: 1.6;
  color: var(--text-muted);
  user-select: none;
}

.task-rozdzial-title-wrap {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.task-rozdzial-title {
  font-weight: 600;
  line-height: 1.35;
}

.task-rozdzial-meta {
  font-weight: 400;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.task-podrozdzial-stack {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin: 0.45rem 0 0 0.65rem;
  padding-left: 0.35rem;
  border-left: 2px solid var(--border-color);
}

/* `display: flex` wyżej wygrywał z domyślnym `[hidden]` — bez tego podrozdziały były zawsze widoczne. */
.task-podrozdzial-stack[hidden] {
  display: none !important;
}

.task-podrozdzial-card {
  display: block;
  width: 100%;
  box-sizing: border-box;
  text-align: left;
  padding: 0.65rem 0.85rem;
  border-radius: 10px;
  border: 1px solid color-mix(in srgb, var(--accent-fizki) 45%, var(--border-color));
  background: color-mix(in srgb, var(--accent-fizki) 14%, var(--bg-card));
  font: inherit;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-main);
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.task-podrozdzial-card:hover {
  background: color-mix(in srgb, var(--accent-fizki) 22%, var(--bg-card));
  border-color: var(--accent-fizki);
}

.task-podrozdzial-card--nested {
  margin-left: 0.25rem;
}

.task-podrozdzial-title {
  display: block;
  line-height: 1.35;
}

.task-podrozdzial-meta {
  display: block;
  margin-top: 0.2rem;
  font-weight: 400;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.panel-sub {
  margin: -0.15rem 0 0.85rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.sheet-panel-wrap {
  margin-top: 0.25rem;
}

.sheet-official-pdf {
  margin: 0 0 0.65rem;
  font-size: 0.88rem;
  line-height: 1.45;
  color: var(--text-muted);
}

.sheet-official-pdf-link {
  color: var(--accent-fizki);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 0.12em;
}

.sheet-official-pdf-link:hover {
  text-decoration-thickness: from-font;
}

.sheet-official-pdf-note {
  font-weight: 400;
  color: var(--text-muted);
}

.sheet-layout {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.sheet-topic-nav {
  flex-shrink: 0;
}

.sheet-topic-label {
  display: block;
  margin: 0 0 0.35rem;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
}

.sheet-topic-select {
  width: 100%;
  box-sizing: border-box;
  font: inherit;
  font-size: 0.92rem;
  padding: 0.55rem 0.65rem;
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-main);
}

.sheet-topic-content {
  min-width: 0;
}

.sheet-card {
  padding: 0.65rem 0.35rem;
  border-bottom: 1px solid var(--border-color);
}

.sheet-card:last-child {
  border-bottom: none;
}

.sheet-card-title {
  margin: 0 0 0.35rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-main);
}

.sheet-formula {
  margin: 0 0 0.35rem;
  font-size: 0.95rem;
}

.sheet-formula .katex-display {
  margin: 0.25rem 0;
}

/* Wzory: poziome przewijanie bez widocznego paska (mysz/kółko/touch nadal działają). */
.sheet-formula,
.formula .katex-display,
.answer-text .katex-display,
.task-q .katex-display,
.rich-formula-block {
  overflow-x: auto;
  overflow-y: hidden;
  max-width: 100%;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.sheet-formula::-webkit-scrollbar,
.formula .katex-display::-webkit-scrollbar,
.answer-text .katex-display::-webkit-scrollbar,
.task-q .katex-display::-webkit-scrollbar,
.rich-formula-block::-webkit-scrollbar {
  display: none;
  height: 0;
}

.symbol-legend {
  margin: 0.35rem 0 0;
  padding: 0.5rem 0.55rem;
  border-radius: 10px;
  background: color-mix(in srgb, var(--bg-card) 70%, var(--text-main));
  border: 1px solid var(--border-color);
}

.symbol-legend-row {
  display: flex;
  gap: 0.4rem;
  align-items: baseline;
  margin-bottom: 0.25rem;
  font-size: 0.78rem;
  line-height: 1.35;
}

.symbol-legend-row:last-child {
  margin-bottom: 0;
}

.symbol-legend-tex {
  flex: 0 0 auto;
  max-width: 42%;
}

.symbol-legend-tex .katex {
  font-size: 0.95em;
}

.symbol-legend-sep {
  flex: 0 0 auto;
  color: var(--text-muted);
  font-weight: 500;
  user-select: none;
}

.symbol-legend-desc {
  flex: 1;
  min-width: 0;
  color: var(--text-main);
}

.task-quiz-symbol-legend {
  margin-top: 0.65rem;
}

.task-quiz-symbol-legend .answer-label {
  margin-bottom: 0.25rem;
}

.task-quiz-symbol-legend .symbol-legend {
  margin-top: 0.25rem;
}

@media (min-width: 28rem) {
  .task-quiz-symbol-legend .symbol-legend {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 1rem;
    row-gap: 0.1rem;
  }

  .task-quiz-symbol-legend .symbol-legend-row {
    margin-bottom: 0.12rem;
  }
}

.panel-title {
  font-size: 1rem;
  font-weight: 700;
  margin: 0 0 0.75rem;
  color: var(--text-main);
}

.list-stack {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.list-item {
  display: block;
  width: 100%;
  text-align: left;
  padding: 0.85rem 1rem;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--text-main);
  transition: background 0.15s ease, border-color 0.15s ease;
}

.list-item:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-fizki);
}

.list-item:has(.list-item-title) {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.list-item-title {
  flex: 1;
  min-width: 0;
}

.list-item small {
  display: block;
  margin-top: 0.25rem;
  font-weight: 400;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.task-difficulty-stars {
  flex-shrink: 0;
  font-size: 0.82rem;
  line-height: 1;
  letter-spacing: 0.04em;
}

.task-sheet-title .task-difficulty-stars {
  margin-left: 0.35rem;
  font-size: 0.78rem;
  vertical-align: middle;
}

.curriculum-crumb {
  margin: 0 0 0.75rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.45;
  word-break: break-word;
}

.task-sheet {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 1.1rem;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow);
  margin-bottom: 1rem;
}

.task-q,
.task-question {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  font-size: 1rem;
  margin: 0 0 0.65rem;
  line-height: 1.45;
}

.task-question .rich-text-line {
  margin: 0;
  line-height: 1.45;
}

.task-question .rich-line-spacer {
  min-height: 0.2rem;
}

.task-quiz-zone {
  margin-bottom: 0.5rem;
}

.task-quiz-footer {
  margin-top: 0.65rem;
}

.task-quiz-footer .btn-escape-hatch {
  width: 100%;
}

.task-formula-quiz {
  margin: 0 0 1rem;
  padding: 0.85rem 0.75rem;
  border-radius: 12px;
  background: var(--card-front);
  border: 1px solid var(--border-color);
}

.task-formula-quiz .answer-label {
  margin-top: 0;
}

.task-quiz-prompt {
  font-size: 0.95rem;
  line-height: 1.5;
  margin: 0 0 0.65rem;
  color: var(--text-main);
}

.task-sheet .task-quiz-options {
  flex: 0 0 auto;
  min-height: 0;
}

/* Bramka zadania: jedna kolumna — wiersze rosną z treścią (rationale pod opcją). */
.task-sheet .task-quiz-options.quiz-options--stack {
  grid-template-rows: none;
  grid-auto-rows: auto;
  align-content: start;
}

.task-quiz-option-cell {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  min-width: 0;
  min-height: 0;
}

.task-quiz-option-cell .quiz-option {
  flex: 1 1 auto;
  min-height: 3rem;
}

.task-quiz-option-rationale {
  padding: 0.45rem 0.5rem;
  border-radius: 8px;
  border-left: 3px solid var(--status-wrong);
  background: color-mix(in srgb, var(--status-wrong) 12%, var(--bg-card));
  font-size: 0.82rem;
  line-height: 1.42;
  color: var(--text-main);
}

.task-quiz-option-rationale-label {
  font-weight: 700;
  display: block;
  margin-bottom: 0.2rem;
  color: var(--status-wrong);
  font-size: 0.8rem;
}

.task-quiz-option-rationale-body .rich-text-line {
  margin: 0;
}

@keyframes task-quiz-unlock-in {
  from {
    opacity: 0.35;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.task-sheet.task-quiz-unlock-anim .task-hint-actions {
  animation: task-quiz-unlock-in 0.42s ease forwards;
}

.task-hint-actions {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-top: 0.65rem;
}

.btn-hint {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 0.5rem 0.75rem;
  border-radius: 10px;
  border: 1px solid color-mix(in srgb, var(--text-muted) 35%, var(--border-color));
  background: color-mix(in srgb, var(--bg-card) 85%, var(--bg-main));
  color: var(--text-main);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.btn-hint:hover:not(:disabled) {
  background: var(--bg-card-hover);
  border-color: color-mix(in srgb, var(--text-muted) 55%, var(--border-color));
}

.btn-hint--active {
  background: color-mix(in srgb, var(--text-muted) 18%, var(--bg-card));
  border-color: var(--border-color);
}

.btn-hint.btn-gated {
  opacity: 0.45;
  cursor: not-allowed;
}

.task-success-feedback {
  margin: 0 0 0.15rem;
  padding: 0.55rem 0.65rem;
  border-radius: 10px;
  font-size: 0.92rem;
  font-weight: 700;
  text-align: center;
  color: var(--status-correct);
  background: color-mix(in srgb, var(--status-correct) 14%, var(--bg-card));
  border: 1px solid color-mix(in srgb, var(--status-correct) 40%, var(--border-color));
  animation: fade-in-up 0.45s ease forwards;
}

@keyframes fade-in-up {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.btn.btn-gated {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn-text-muted {
  display: block;
  width: 100%;
  margin: 0.85rem 0 0;
  padding: 0.35rem 0.5rem;
  border: 0;
  background: transparent;
  color: var(--text-muted);
  font-size: 0.82rem;
  font-weight: 500;
  text-align: center;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.btn-text-muted:hover {
  color: var(--text-main);
}

.task-answer-gate {
  margin: 0 0 0.85rem;
  padding: 0.85rem 0.75rem;
  border-radius: 12px;
  background: var(--card-front);
  border: 1px solid var(--border-color);
}

.task-answer-gate .answer-label {
  margin-top: 0;
}

.task-math-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.task-math-input {
  flex: 1 1 6rem;
  min-width: 0;
  padding: 0.55rem 0.65rem;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  background: var(--bg-main);
  color: var(--text-main);
  font-size: 1rem;
}

.task-math-input:focus {
  outline: 2px solid color-mix(in srgb, var(--accent-fizki) 55%, transparent);
  outline-offset: 1px;
}

.task-math-input--revealed {
  border-color: #c62828;
  color: #c62828;
  background: color-mix(in srgb, #c62828 8%, var(--bg-main));
}

.task-math-unit {
  font-size: 0.9rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.task-abcd-options {
  display: grid;
  gap: 0.5rem;
}

.task-abcd-option {
  width: 100%;
  text-align: left;
  justify-content: flex-start;
  white-space: normal;
  line-height: 1.35;
  color: var(--accent-on-fizki);
}

.task-abcd-option .rich-text-line,
.task-abcd-option .katex,
.task-abcd-option .katex * {
  color: inherit;
}

/* Wzory w treści zadania / ABCD — bez szarych ramek (.rich-formula-block) */
.task-q .rich-formula-block,
.task-abcd-option .rich-formula-block,
.task-quiz-prompt .rich-formula-block,
.task-quiz-option-rationale-body .rich-formula-block {
  margin: 0;
  padding: 0;
  background: none;
  border: none;
  border-radius: 0;
  text-align: inherit;
}

.task-abcd-option .rich-formula-block {
  display: inline;
  vertical-align: middle;
}

.task-q .rich-formula-block {
  display: block;
  margin: 0.2rem 0;
}

.task-abcd-option--correct {
  border-color: var(--status-correct, #2e7d32);
  background: color-mix(in srgb, var(--status-correct, #2e7d32) 12%, var(--bg-card));
  color: var(--text-main);
}

.task-abcd-option--wrong {
  border-color: #c62828;
  background: color-mix(in srgb, #c62828 10%, var(--bg-card));
  color: var(--text-main);
}

.task-strike-hint {
  margin: 0.55rem 0 0;
  font-size: 0.85rem;
  line-height: 1.4;
  color: var(--text-muted);
}

@keyframes shake {
  0%,
  100% {
    transform: translateX(0);
  }
  20%,
  60% {
    transform: translateX(-6px);
  }
  40%,
  80% {
    transform: translateX(6px);
  }
}

.shake {
  animation: shake 0.4s ease;
}

.answer-block {
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px dashed var(--border-color);
}

.answer-block.hidden {
  display: none;
}

.formulas-block {
  margin-top: 0.75rem;
  padding: 0.85rem 0.95rem;
  border-radius: 12px;
  background: var(--card-front);
  border: 1px solid var(--border-color);
}

.formulas-block.hidden {
  display: none;
}

.formula-list {
  margin: 0;
  padding-left: 1.15rem;
}

.formula-list li {
  margin-bottom: 0.35rem;
  font-size: 0.98rem;
  font-family: "Cambria Math", "Times New Roman", serif;
  line-height: 1.45;
}

.formula-list li:last-child {
  margin-bottom: 0;
}

.solution-block {
  margin-top: 0.75rem;
  padding: 0.85rem 0.95rem;
  border-radius: 12px;
  background: color-mix(in srgb, var(--status-correct) 10%, var(--bg-card));
  border: 1px solid color-mix(in srgb, var(--status-correct) 35%, var(--border-color));
}

.solution-block.hidden {
  display: none;
}

#task-solution .solution-steps,
.task-solution .solution-steps {
  margin: 0;
  padding-left: 1.05rem;
  list-style-position: outside;
}

#task-solution .solution-steps li,
.task-solution .solution-steps li {
  margin: 0 0 0.45rem;
  padding-left: 0.15rem;
  font-size: 0.92rem;
  line-height: 1.42;
  color: var(--text-main);
}

#task-solution .solution-steps li:last-child,
.task-solution .solution-steps li:last-child {
  margin-bottom: 0;
}

#task-solution .rich-line-spacer,
.task-solution .rich-line-spacer {
  display: none;
}

#task-solution .rich-formula-block,
.task-solution .rich-formula-block {
  margin: 0.15rem 0;
  padding: 0;
  background: none;
  border: none;
  border-radius: 0;
  text-align: left;
  display: inline;
}

#task-solution .rich-text-line:empty,
.task-solution .rich-text-line:empty {
  display: none;
}

#task-solution .solution-step-body .katex,
.task-solution .solution-step-body .katex {
  font-size: 1em;
}

#task-solution .solution-step-body .katex-display,
.task-solution .solution-step-body .katex-display {
  margin: 0.2rem 0;
  text-align: left;
}

.solution-step-body,
.law-line-body {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.rich-text-line {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.55;
  font-family: "Segoe UI", system-ui, sans-serif;
  color: var(--text-main);
}

.solution-step-body .rich-text-line {
  font-size: 0.92rem;
}

.rich-formula-block {
  margin: 0.35rem 0;
  padding: 0.4rem 0.35rem;
  text-align: center;
  border-radius: 8px;
  background: color-mix(in srgb, var(--bg-card) 55%, var(--text-main));
  border: 1px solid var(--border-color);
}

.solution-step-body .rich-formula-block {
  background: color-mix(in srgb, var(--status-correct) 8%, var(--bg-card));
}

.rich-line-spacer {
  min-height: 0.45rem;
}

.law-line-body .rich-text-line {
  font-size: 0.95rem;
}

.answer-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}

.answer-text {
  font-size: 1rem;
  font-family: "Segoe UI", system-ui, sans-serif;
  margin: 0;
}

.answer-text .rich-text-line {
  font-family: "Segoe UI", system-ui, sans-serif;
  font-size: 1rem;
}

.answer-text .rich-formula-block {
  margin: 0.5rem 0;
  background: color-mix(in srgb, var(--bg-card) 60%, var(--text-main));
  border: 1px solid var(--border-color);
}

/* Bottom Navigation — główne moduły (Fiszki / Karta / Zadania) na mobile */
@media (max-width: 768px) {
  #app {
    padding-bottom: 80px;
  }

  .app-footer {
    margin-bottom: calc(4.75rem + env(safe-area-inset-bottom, 0px));
    padding-bottom: 0.35rem;
  }

  .tabs-main {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    margin: 0;
    border-radius: 0;
    background: var(--bg-main);
    border: none;
    border-top: 1px solid var(--border-color);
    box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.3);
    padding-bottom: env(safe-area-inset-bottom);
  }

  .tabs-main .tab,
  .tabs-main button {
    flex: 1;
    padding: 1rem 0;
    border-radius: 0;
  }
}

/* View Transitions API */
::view-transition-old(root),
::view-transition-new(root) {
  animation-duration: 0.25s;
  animation-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
}

::view-transition-old(root) {
  animation-name: fade-out, slide-out;
}

::view-transition-new(root) {
  animation-name: fade-in, slide-in;
}

@keyframes fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes fade-out {
  from {
    opacity: 1;
  }
  to {
    opacity: 0;
  }
}

@keyframes slide-in {
  from {
    transform: translateY(10px);
  }
  to {
    transform: translateY(0);
  }
}

@keyframes slide-out {
  from {
    transform: translateY(0);
  }
  to {
    transform: translateY(-10px);
  }
}