/**
 * Shared design tokens and UI primitives for prep-dashboard, student hub, plan-session.
 * Load before page-specific stylesheets.
 */
:root {
  /* Brand — зелёная палитра карты подготовки */
  --ui-brand: #16a34a;
  --ui-brand-bright: #22c55e;
  --ui-brand-dark: #15803d;
  --ui-brand-light: #ecfdf5;
  --ui-brand-mid: #22c55e;

  /* Accent — teal для геймифицированного хаба */
  --ui-accent: #0f766e;
  --ui-accent-light: #14b8a6;
  --ui-accent-dark: #0d5c56;

  /* Surfaces */
  --ui-bg: #f5f7f6;
  --ui-bg-hub: #f4f6f5;
  --ui-card: #ffffff;
  --ui-border: #e2ebe6;
  --ui-border-soft: #e5e7eb;

  /* Text */
  --ui-text: #1f2937;
  --ui-text-hub: #134e4a;
  --ui-muted: #6b7280;
  --ui-muted-hub: #64748b;

  /* Focus and interaction */
  --ui-focus: #0f766e;
  --ui-focus-ring: rgba(15, 118, 110, 0.24);
  --ui-control-min-height: 44px;

  /* Semantic */
  --ui-success-bg: #dcfce7;
  --ui-success-text: #166534;
  --ui-warn-bg: #fef3c7;
  --ui-warn-text: #92400e;
  --ui-danger-bg: #fee2e2;
  --ui-danger-text: #991b1b;
  --ui-yellow-bg: #fff7ed;

  /* Layout */
  --ui-radius: 16px;
  --ui-radius-sm: 10px;
  --ui-radius-xs: 8px;
  --ui-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
  --ui-shadow-hub: 0 4px 24px rgba(15, 118, 110, 0.08);
  --ui-sidebar: 240px;

  /* Typography */
  --ui-font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  /* Buttons */
  --ui-btn-radius: 10px;
  --ui-btn-padding-y: 10px;
  --ui-btn-padding-x: 16px;
  --ui-btn-font-size: 0.88rem;
  --ui-btn-font-weight: 600;

  /* Progress */
  --ui-progress-height: 8px;
  --ui-progress-radius: 4px;

  /* Legacy aliases — student-hub.css */
  --hub-teal: var(--ui-accent);
  --hub-teal-light: var(--ui-accent-light);
  --hub-teal-dark: var(--ui-accent-dark);
  --hub-bg: var(--ui-bg-hub);
  --hub-card: var(--ui-card);
  --hub-text: var(--ui-text-hub);
  --hub-muted: var(--ui-muted-hub);
  --hub-radius: var(--ui-radius);
  --hub-shadow: var(--ui-shadow-hub);
}

/* —— Buttons —— */
.ui-btn,
.prep-dash__btn,
.hub-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: var(--ui-btn-padding-y) var(--ui-btn-padding-x);
  border-radius: var(--ui-btn-radius);
  font-family: var(--ui-font);
  font-size: var(--ui-btn-font-size);
  font-weight: var(--ui-btn-font-weight);
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: filter 0.15s, transform 0.1s, background 0.15s, box-shadow 0.15s;
  min-height: var(--ui-control-min-height);
}

:where(a, button, input, select, textarea, summary):focus-visible {
  outline: 3px solid var(--ui-focus-ring);
  outline-offset: 3px;
}

.ui-btn--primary,
.prep-dash__btn--primary,
.hub-btn--primary {
  background: var(--ui-brand-bright);
  color: #fff;
}

.hub-btn--primary {
  background: var(--ui-accent);
  box-shadow: 0 4px 14px rgba(15, 118, 110, 0.35);
}

.ui-btn--primary:hover,
.prep-dash__btn--primary:hover {
  filter: brightness(1.08);
}

.hub-btn--primary:hover {
  background: var(--ui-accent-dark);
  transform: translateY(-1px);
  filter: none;
}

.ui-btn--outline,
.prep-dash__btn--outline,
.hub-btn--outline {
  background: var(--ui-card);
  color: var(--ui-brand);
  border: 1px solid var(--ui-brand-mid);
}

.hub-btn--outline {
  color: var(--ui-accent);
  border: 2px solid rgba(15, 118, 110, 0.35);
}

.hub-btn--outline:hover {
  background: rgba(15, 118, 110, 0.06);
}

.ui-btn--sm,
.prep-dash__btn--sm {
  padding: 6px 12px;
  font-size: 0.8rem;
}

.ui-btn--block,
.prep-dash__btn--block {
  width: 100%;
}

.prep-dash__btn--primary,
.hub-btn--primary,
.hub-btn--outline {
  width: 100%;
}

.quiz-feedback-continue-wrap {
  margin-top: 12px;
}

.quiz-feedback-status--wrong {
  margin-bottom: 12px;
  padding: 10px 14px;
  border-radius: 10px;
  background: #fdecea;
  border: 1px solid #f5c2c0;
}

.quiz-feedback-status__badge {
  margin: 0;
  font-weight: 800;
  font-size: 1rem;
  color: #9a3412;
}

.quiz-feedback-your {
  margin: 6px 0 0;
  font-size: 0.92rem;
  color: #7c2d12;
  line-height: 1.45;
}

.quiz-feedback-your__val {
  font-weight: 700;
}

.quiz-feedback-label {
  font-weight: 600;
}

.quiz-feedback-correct {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin: 0 0 12px;
  padding: 12px 14px;
  border: 1px solid #bbf7d0;
  border-radius: 10px;
  background: #f0fdf4;
  color: #166534;
}

.quiz-feedback-correct__value {
  font-size: 1rem;
  overflow-wrap: anywhere;
}

.quiz-question-card {
  background: var(--ui-card);
  border-color: var(--ui-border);
  border-radius: var(--ui-radius-sm);
}

.quiz-question-card .q-text {
  overflow-x: auto;
  overflow-wrap: anywhere;
  -webkit-overflow-scrolling: touch;
}

.quiz-question-card img {
  max-width: 100%;
  height: auto;
}

.quiz-question-card :where(input, textarea, select) {
  max-width: 100%;
  font-size: 1rem;
}

.quiz-question-card .options label {
  min-height: var(--ui-control-min-height);
  display: flex;
  align-items: center;
  gap: 10px;
}

.quiz-question-submit {
  width: 100%;
  min-height: var(--ui-control-min-height);
  margin-top: 16px;
}

@media (max-width: 640px) {
  .quiz-question-card {
    padding: 16px;
  }

  .quiz-feedback-continue,
  .quiz-feedback-continue-wrap .btn {
    width: 100%;
  }
}

.rubric-card--wrong {
  border-color: #f5c2c0;
}

.quiz-feedback-continue {
  min-width: 180px;
}

.ui-btn:disabled,
.prep-dash__btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* —— Cards —— */
.ui-card {
  background: var(--ui-card);
  border-radius: var(--ui-radius);
  box-shadow: var(--ui-shadow);
  padding: 16px 18px;
}

/* —— Progress —— */
.ui-progress,
.prep-dash__stat-bar,
.prep-dash__plan-progress-bar {
  height: var(--ui-progress-height);
  background: var(--ui-border-soft);
  border-radius: var(--ui-progress-radius);
  overflow: hidden;
}

.ui-progress__fill,
.prep-dash__stat-bar-fill,
.prep-dash__plan-progress-fill {
  height: 100%;
  background: var(--ui-brand-bright);
  border-radius: 999px;
  transition: width 0.3s ease;
}

/* —— Alerts —— */
.ui-alert {
  margin: 0;
  padding: 10px 14px;
  border-radius: var(--ui-radius-xs);
  font-size: 0.9rem;
}

.ui-alert--ok,
.prep-dash__alert--ok {
  background: var(--ui-success-bg);
  color: var(--ui-success-text);
}

.ui-alert--warn,
.prep-dash__alert--warn {
  background: var(--ui-warn-bg);
  color: var(--ui-warn-text);
}

.ui-alert--err,
.prep-dash__alert--err {
  background: var(--ui-danger-bg);
  color: var(--ui-danger-text);
}

.prep-dash__alert {
  max-width: 960px;
  margin: 0 auto;
  padding: 12px 16px 0;
}

/* —— Typography helpers —— */
.ui-section-title,
.hub-section-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--ui-text);
  margin: 0 0 12px;
}

.ui-kicker {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ui-muted);
  margin: 0 0 6px;
}

.ui-muted {
  color: var(--ui-muted);
  font-size: 0.85rem;
}

/* —— Streak dots —— */
.prep-dash__streak-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ui-border-soft);
}

.prep-dash__streak-dot.is-on {
  background: var(--ui-brand-bright);
}

.prep-dash__streak-dots {
  display: flex;
  gap: 6px;
  margin: 8px 0;
}

/* Кнопка «Поделиться / Переслать» + всплывающее меню (site-share.js) */
.site-share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border: 1px solid #cbd5e1;
  border-radius: 999px;
  background: #fff;
  color: #0f766e;
  font: inherit;
  font-size: 0.86rem;
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
  white-space: nowrap;
}
.site-share-btn:hover { background: #f0fdfa; border-color: #99f6e4; }
.site-share-btn--compact { padding: 5px 10px; font-size: 0.8rem; }

.site-share-menu {
  position: absolute;
  z-index: 200;
  min-width: 190px;
  padding: 6px;
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 12px;
  box-shadow: 0 12px 32px rgba(15, 40, 30, 0.16);
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.site-share-menu__item {
  display: block;
  padding: 9px 12px;
  border: 0;
  border-radius: 8px;
  background: none;
  color: #1f2937;
  font: inherit;
  font-size: 0.9rem;
  text-align: left;
  text-decoration: none;
  cursor: pointer;
}
.site-share-menu__item:hover { background: #f1f5f9; }
.site-share-menu__item--copy { color: #0f766e; font-weight: 600; }
.site-share-menu__item:disabled { opacity: 0.6; cursor: default; }
.site-share-menu__hint { margin: 4px 8px 2px; font-size: 0.8rem; color: #2d6a4f; }