/**
 * Lango 3.0 design system — host UI overrides
 * Scoped to standard host (not HK elderly variant).
 * See DESIGN.md for token definitions.
 */

body:not(.hk-elderly) #app.lango-host {
  --lango-page: #eaf1ff;
  --lango-page-deep: #dde9ff;
  --lango-surface: #fffdf8;
  --lango-white: #ffffff;
  --lango-primary: #a1268e;
  --lango-primary-deep: #743c9b;
  --lango-primary-soft: #fbe1eb;
  --lango-teal: #007f78;
  --lango-teal-soft: #d8f7f2;
  --lango-selection: #2d73b5;
  --lango-selection-soft: #dcefff;
  --lango-gold: #f9b545;
  --lango-sky: #54adf4;
  --lango-ink: #344356;
  --lango-muted: #526579;
  --lango-text-strong: #243041;
  --lango-text-on-photo: #1e2a38;
  --lango-line: #c8d5e6;
  --lango-error: #b92d4f;
  --lango-radius-card: 32px;
  --lango-radius-pill: 999px;
  --lango-font: "Nunito", ui-rounded, system-ui, sans-serif;
  --lango-shadow-card: 0 10px 20px rgba(52, 67, 86, 0.14);
  --lango-shadow-btn: 0 5px 10px rgba(52, 67, 86, 0.16);
  --lango-bg-adventure: linear-gradient(
    180deg,
    var(--lango-page-deep) 0%,
    var(--lango-selection-soft) 42%,
    var(--lango-teal-soft) 78%,
    rgba(194, 148, 255, 0.35) 100%
  );
  --lango-btn-primary: linear-gradient(90deg, var(--lango-primary) 0%, var(--lango-primary-deep) 100%);
  --lango-btn-primary-shadow:
    inset 0 -2px 0 rgba(0, 0, 0, 0.12),
    inset 0 0 0 2px rgba(255, 255, 255, 0.35),
    0 8px 0 rgba(116, 60, 155, 0.45),
    0 12px 22px rgba(116, 60, 155, 0.22);
  --lango-btn-ghost-shadow:
    inset 0 0 0 2px var(--lango-primary),
    var(--lango-shadow-btn);
  font-family: var(--lango-font);
}

/* Canvas backgrounds — mist blue instead of yellow / bright blue */
body:not(.hk-elderly):has(#app.lango-host #screen-login.active),
body:not(.hk-elderly):has(#app.lango-host #screen-class.active),
body:not(.hk-elderly):has(#app.lango-host #screen-course.active),
body:not(.hk-elderly):has(#app.lango-host #screen-section.active),
body:not(.hk-elderly):has(#app.lango-host #screen-waiting.active),
body:not(.hk-elderly):has(#app.lango-host #screen-host-video.active),
body:not(.hk-elderly):has(#app.lango-host #screen-host-buzzin.active),
body:not(.hk-elderly):has(#app.lango-host #screen-host-buzzin-feedback.active),
body:not(.hk-elderly):has(#app.lango-host #screen-host-buzzin-empty.active),
body:not(.hk-elderly):has(#app.lango-host #screen-host-quiz-preview.active),
body:not(.hk-elderly):has(#app.lango-host #screen-host-quiz-question.active),
body:not(.hk-elderly):has(#app.lango-host #screen-host-quiz-results.active),
body:not(.hk-elderly):has(#app.lango-host #screen-host-fast-results.active),
body:not(.hk-elderly):has(#app.lango-host #screen-host-quiz-finished.active) {
  background: var(--lango-page);
  background-image: var(--lango-bg-adventure);
}

body:not(.hk-elderly) #app.lango-host .host-mcq-preview-screen,
body:not(.hk-elderly) #app.lango-host .host-buzzin-screen,
body:not(.hk-elderly) #app.lango-host .course-scene {
  background: var(--lango-page);
  background-image: var(--lango-bg-adventure);
}

body:not(.hk-elderly) #app.lango-host .course-scene::before {
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

/* Login — cream card, no glass purple */
body:not(.hk-elderly) #app.lango-host .login-home-link {
  color: var(--lango-ink);
  text-shadow: none;
}

body:not(.hk-elderly) #app.lango-host .login-home-link:hover {
  color: var(--lango-primary);
}

body:not(.hk-elderly) #app.lango-host .login-panel {
  padding: 10rem 2.5rem 2rem;
  border: 3px solid transparent;
  border-radius: var(--lango-radius-card);
  background:
    linear-gradient(var(--lango-surface), var(--lango-surface)) padding-box,
    var(--lango-btn-primary) border-box;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  box-shadow: var(--lango-shadow-card);
}

body:not(.hk-elderly) #app.lango-host .login-title {
  color: var(--lango-ink);
  text-shadow: none;
  letter-spacing: -0.02em;
}

body:not(.hk-elderly) #app.lango-host .login-field input {
  border: 2px solid var(--lango-line);
  border-radius: 20px;
  color: var(--lango-ink);
  box-shadow: none;
}

body:not(.hk-elderly) #app.lango-host .login-field input:focus {
  outline: 3px solid var(--lango-selection-soft);
  outline-offset: 1px;
  border-color: var(--lango-selection);
}

body:not(.hk-elderly) #app.lango-host .login-btn {
  background: var(--lango-btn-primary);
  box-shadow: var(--lango-btn-primary-shadow);
}

body:not(.hk-elderly) #app.lango-host .login-btn:hover {
  filter: brightness(1.04);
}

body:not(.hk-elderly) #app.lango-host .login-btn:active {
  transform: translateY(3px);
  box-shadow:
    inset 0 -1px 0 rgba(0, 0, 0, 0.1),
    0 4px 0 rgba(116, 60, 155, 0.4),
    0 8px 16px rgba(116, 60, 155, 0.18);
}

/* Page titles on mist canvas */
body:not(.hk-elderly) #app.lango-host .class-screen .class-page-title,
body:not(.hk-elderly) #app.lango-host .course-page-title {
  color: var(--lango-text-on-photo);
  -webkit-text-stroke: 0;
  paint-order: normal;
  background: none;
  -webkit-text-fill-color: var(--lango-text-on-photo);
  text-shadow:
    0 2px 0 rgba(255, 255, 255, 0.92),
    0 0 18px rgba(255, 255, 255, 0.75);
  filter: none;
  letter-spacing: -0.02em;
}

body:not(.hk-elderly) #app.lango-host .course-step {
  color: var(--lango-text-on-photo);
  font-weight: 800;
  text-shadow:
    0 1px 0 rgba(255, 255, 255, 0.95),
    0 0 16px rgba(255, 255, 255, 0.8),
    0 2px 8px rgba(36, 48, 65, 0.18);
}

body:not(.hk-elderly) #app.lango-host .class-teacher-label {
  color: var(--lango-text-strong);
  font-weight: 800;
  text-shadow:
    0 1px 0 rgba(255, 255, 255, 0.85),
    0 0 12px rgba(255, 255, 255, 0.65);
}

body:not(.hk-elderly) #app.lango-host .class-title-mark {
  text-decoration-color: var(--lango-primary);
}

body:not(.hk-elderly) #app.lango-host .course-class-label__eyebrow {
  color: var(--lango-primary);
}

body:not(.hk-elderly) #app.lango-host .course-class-label__name {
  color: var(--lango-ink);
}

body:not(.hk-elderly) #app.lango-host .course-panel-header::before {
  color: var(--lango-text-on-photo);
  text-shadow:
    0 1px 0 rgba(255, 255, 255, 0.95),
    0 0 14px rgba(255, 255, 255, 0.75);
}

/* Class picker cards — cream tiles with teal accent */
body:not(.hk-elderly) #app.lango-host .class-screen .class-section-title {
  color: var(--lango-ink);
}

body:not(.hk-elderly) #app.lango-host .class-screen .class-teacher-chip {
  background: var(--lango-white);
  color: var(--lango-ink);
  border: 1px solid var(--lango-line);
  box-shadow: var(--lango-shadow-btn);
}

body:not(.hk-elderly) #app.lango-host .class-screen .class-teacher-chip strong {
  color: var(--lango-primary);
}

body:not(.hk-elderly) #app.lango-host .class-screen .class-card,
body:not(.hk-elderly) #app.lango-host .class-screen .class-card.active {
  padding: 8px;
  border: 2px solid var(--lango-teal);
  border-radius: 28px;
  background: var(--lango-teal-soft);
  color: var(--lango-ink);
  box-shadow: var(--lango-shadow-card);
}

body:not(.hk-elderly) #app.lango-host .class-screen .class-card.active {
  border-color: var(--lango-primary);
  background: var(--lango-primary-soft);
  box-shadow:
    0 0 0 3px rgba(161, 38, 142, 0.12),
    var(--lango-shadow-card);
}

body:not(.hk-elderly) #app.lango-host .class-screen .class-card-inner {
  border-radius: 20px;
  background: var(--lango-surface);
}

body:not(.hk-elderly) #app.lango-host .class-screen .class-card-name,
body:not(.hk-elderly) #app.lango-host .class-screen .class-card.active .class-card-name {
  color: var(--lango-ink);
}

body:not(.hk-elderly) #app.lango-host .class-screen .class-card-meta,
body:not(.hk-elderly) #app.lango-host .class-screen .class-card.active .class-card-meta {
  color: var(--lango-text-strong);
  font-weight: 800;
}

body:not(.hk-elderly) #app.lango-host .class-screen .class-card-go {
  background: var(--lango-btn-primary);
  box-shadow: var(--lango-btn-primary-shadow);
  text-shadow: none;
}

body:not(.hk-elderly) #app.lango-host .class-screen .class-sections,
body:not(.hk-elderly) #app.lango-host .class-screen .class-grid {
  max-width: min(1280px, 94vw);
}

body:not(.hk-elderly) #app.lango-host .class-screen .class-grid {
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
}

body:not(.hk-elderly) #app.lango-host .class-screen .class-card-inner {
  min-height: 200px;
}

/* Course picker cards — white tiles, subtle border */
body:not(.hk-elderly) #app.lango-host .course-pick-card,
body:not(.hk-elderly) #app.lango-host .course-pick-card.active {
  padding: 8px;
  border-radius: var(--lango-radius-card);
  background: var(--lango-white);
  border: 2px solid var(--lango-line);
  box-shadow: var(--lango-shadow-card);
}

body:not(.hk-elderly) #app.lango-host .course-pick-card.active {
  border-color: var(--lango-primary);
  box-shadow:
    0 0 0 3px rgba(161, 38, 142, 0.1),
    var(--lango-shadow-card);
}

body:not(.hk-elderly) #app.lango-host .course-pick-card-inner {
  border-radius: 22px;
  background: var(--lango-surface);
  box-shadow: none;
}

body:not(.hk-elderly) #app.lango-host .course-pick-title {
  color: var(--lango-text-strong);
  font-weight: 900;
  text-shadow: none;
}

body:not(.hk-elderly) #app.lango-host .course-pick-desc,
body:not(.hk-elderly) #app.lango-host .course-pick-level {
  color: var(--lango-text-strong);
  font-weight: 800;
  letter-spacing: 0.01em;
}

body:not(.hk-elderly) #app.lango-host .section-road-meta,
body:not(.hk-elderly) #app.lango-host .section-road-label {
  color: var(--lango-text-strong);
  font-weight: 800;
}

/* Section journey header — cream bar, less glass */
body:not(.hk-elderly) #app.lango-host .section-header {
  border-radius: var(--lango-radius-card);
  background: var(--lango-surface);
  border: 1px solid var(--lango-line);
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  box-shadow: var(--lango-shadow-card);
}

body:not(.hk-elderly) #app.lango-host .section-journey-title {
  color: var(--lango-ink);
}

body:not(.hk-elderly) #app.lango-host .waiting-page-title,
body:not(.hk-elderly) #app.lango-host .section-road-title {
  color: var(--lango-ink);
  -webkit-text-stroke: 0;
  paint-order: normal;
  text-shadow: none;
  letter-spacing: -0.02em;
}

body:not(.hk-elderly) #app.lango-host .waiting-room-code-card {
  border: 2px solid var(--lango-primary);
  border-radius: var(--lango-radius-card);
  background: var(--lango-surface);
  box-shadow: var(--lango-shadow-card);
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

body:not(.hk-elderly) #app.lango-host .waiting-room-code-label {
  color: var(--lango-primary);
}

body:not(.hk-elderly) #app.lango-host .section-road-subtitle {
  color: var(--lango-text-strong);
  font-weight: 800;
}

/* Utility dock — solid cream, no heavy blur */
body:not(.hk-elderly) #app.lango-host .host-utility-dock {
  border: 1px solid var(--lango-line);
  background: rgba(255, 253, 248, 0.94);
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  box-shadow: var(--lango-shadow-card);
}

body:not(.hk-elderly) #app.lango-host .course-class-label:not([hidden]):not(.is-empty) {
  border: 1px solid var(--lango-line);
  background: var(--lango-white);
  box-shadow: var(--lango-shadow-btn);
}

body:not(.hk-elderly) #app.lango-host .host-persistent-room-code.is-visible {
  border: 1px solid var(--lango-line);
  background: var(--lango-white);
  box-shadow: var(--lango-shadow-btn);
}

body:not(.hk-elderly) #app.lango-host .host-online-count.is-visible {
  border: 1px solid var(--lango-teal);
  background: var(--lango-teal-soft);
}

/* Primary CTAs — purple gradient */
body:not(.hk-elderly) #app.lango-host .waiting-start-session-btn,
body:not(.hk-elderly) #app.lango-host .exercise-start-btn,
body:not(.hk-elderly) #app.lango-host .host-mcq-preview-next-btn,
body:not(.hk-elderly) #app.lango-host .host-mcq-next-btn,
body:not(.hk-elderly) #app.lango-host #btn-host-video-next-exercise,
body:not(.hk-elderly) #app.lango-host #btn-host-buzzin-done,
body:not(.hk-elderly) #app.lango-host #btn-host-buzzin-feedback-done,
body:not(.hk-elderly) #app.lango-host #btn-host-buzzin-empty-done {
  color: #fff;
  background: var(--lango-btn-primary);
  box-shadow: var(--lango-btn-primary-shadow);
}

/* Secondary / back — ghost pill */
body:not(.hk-elderly) #app.lango-host .waiting-dashboard-btn,
body:not(.hk-elderly) #app.lango-host .class-back-btn,
body:not(.hk-elderly) #app.lango-host .exercise-cancel-btn,
body:not(.hk-elderly) #app.lango-host .host-mcq-preview-footer-btn,
body:not(.hk-elderly) #app.lango-host .host-mcq-footer-btn:not(.host-mcq-next-btn),
body:not(.hk-elderly) #app.lango-host .host-video-footer-btn,
body:not(.hk-elderly) #app.lango-host .host-buzzin-footer-btn,
body:not(.hk-elderly) #app.lango-host #screen-host-fast-results .host-fast-result-button--back,
body:not(.hk-elderly) #app.lango-host #btn-host-quiz-done,
body:not(.hk-elderly) #app.lango-host .host-mcq-result-footer .host-mcq-footer-btn:not(.host-mcq-next-btn),
body:not(.hk-elderly) #app.lango-host .host-fast-result-button--back,
body:not(.hk-elderly) #app.lango-host .host-leaderboard__back {
  color: var(--lango-primary);
  background: var(--lango-white);
  box-shadow: var(--lango-btn-ghost-shadow);
}

body:not(.hk-elderly) #app.lango-host .waiting-dashboard-face {
  background: var(--lango-btn-primary);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.35);
}

/* Leaderboard next + fast-result next — gold on dark celebration surface */
body:not(.hk-elderly) #app.lango-host #screen-host-fast-results .host-fast-result-button--next,
body:not(.hk-elderly) #app.lango-host .host-mcq-result-footer .host-mcq-next-btn,
body:not(.hk-elderly) #app.lango-host .host-fast-result-button--next,
body:not(.hk-elderly) #app.lango-host .host-leaderboard__next {
  color: var(--lango-ink);
  background: linear-gradient(180deg, #fdd889 0%, var(--lango-gold) 100%);
  box-shadow:
    inset 0 -2px 0 rgba(0, 0, 0, 0.08),
    inset 0 0 0 2px rgba(255, 255, 255, 0.55),
    0 8px 0 rgba(180, 120, 20, 0.55),
    0 12px 20px rgba(249, 181, 69, 0.28);
}

/* Leaderboard shell — primary-deep plum instead of hot magenta */
body:not(.hk-elderly) #app.lango-host .host-leaderboard {
  --lb-magenta: var(--lango-primary);
  --lb-amber: var(--lango-primary-deep);
  --lb-ink: var(--lango-ink);
  --lb-cream: var(--lango-surface);
  --lb-sheet: var(--lango-white);
  --lb-plinth: var(--lango-primary-soft);
  --lb-plinth-deep: var(--lango-primary-deep);
  --lb-pink: #e8a0cf;
  --lb-glow: rgba(251, 225, 235, 0.8);
  background: linear-gradient(180deg, var(--lango-primary-deep) 0%, #5a2d78 100%);
}

body:not(.hk-elderly) #app.lango-host .host-leaderboard__overlay {
  background:
    radial-gradient(circle at 50% 18%, rgba(251, 225, 235, 0.28), transparent 42%),
    linear-gradient(180deg, rgba(116, 60, 155, 0.15), rgba(52, 67, 86, 0.35));
}

/* Exercise footers — cream dock */
body:not(.hk-elderly) #app.lango-host .host-mcq-result-footer,
body:not(.hk-elderly) #app.lango-host .host-fast-result-footer {
  border: 1px solid var(--lango-line);
  background: rgba(255, 253, 248, 0.92);
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  box-shadow: var(--lango-shadow-card);
}

@media (prefers-reduced-motion: reduce) {
  body:not(.hk-elderly) #app.lango-host .login-btn,
  body:not(.hk-elderly) #app.lango-host .waiting-start-session-btn,
  body:not(.hk-elderly) #app.lango-host .class-screen .class-card {
    transition: none;
  }
}