:root {
  --forest: #173a32;
  --forest-2: #24564b;
  --sage: #dfe9df;
  --cream: #f6f2e8;
  --paper: #fffdf8;
  --coral: #e57357;
  --gold: #d9ad55;
  --ink: #17211e;
  --muted: #67736d;
  --line: #dfe3dc;
  --radius: 18px;
  --shadow: 0 16px 42px rgba(23,58,50,.1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  min-height: 100dvh;
  margin: 0;
  padding-bottom: env(safe-area-inset-bottom);
  color: var(--ink);
  background: var(--cream);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", sans-serif;
  -webkit-font-smoothing: antialiased;
}
button, input, select { font: inherit; }
button, select { cursor: pointer; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  min-height: 68px;
  padding: max(12px, env(safe-area-inset-top)) max(22px, env(safe-area-inset-right), calc((100vw - 1160px) / 2)) 12px max(22px, env(safe-area-inset-left), calc((100vw - 1160px) / 2));
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  background: rgba(246,242,232,.9);
  border-bottom: 1px solid rgba(23,58,50,.09);
  backdrop-filter: blur(16px);
}
.brand { display: flex; align-items: center; gap: 11px; color: var(--forest); text-decoration: none; font-size: 15px; letter-spacing: .02em; }
.brand-mark { width: 36px; height: 36px; display: grid; place-items: center; color: white; background: var(--forest); border-radius: 11px; font-family: Georgia, serif; font-size: 21px; }
.topbar-actions { display:flex; align-items:center; gap:8px; }
.portal-link { min-height:44px; padding:0 12px; display:inline-flex; align-items:center; color:var(--forest); text-decoration:none; font-size:13px; font-weight:700; }
.quiet-button { border: 1px solid rgba(23,58,50,.22); border-radius: 999px; background: transparent; color: var(--forest); padding: 9px 15px; font-size: 13px; font-weight: 650; }
.quiet-button:disabled { opacity: .55; cursor: wait; }

main { width: min(1160px, calc(100% - 44px)); margin: 0 auto; padding-bottom: 140px; }
.hero { min-height: 440px; padding: 74px 0 62px; display: grid; grid-template-columns: 1.5fr .8fr; gap: 74px; align-items: center; }
.eyebrow { margin: 0 0 13px; color: var(--coral); font-size: 11px; font-weight: 800; letter-spacing: .18em; }
h1 { margin: 0; color: var(--forest); font: 700 clamp(44px, 6vw, 76px)/1.04 Georgia, "Times New Roman", serif; letter-spacing: -.045em; }
.hero-copy { max-width: 660px; margin: 25px 0 0; color: var(--muted); font-size: 17px; }
.hero-card { padding: 28px; display: grid; gap: 0; background: var(--forest); color: white; border-radius: 28px; box-shadow: var(--shadow); }
.hero-card div { padding: 19px 4px; display: flex; align-items: baseline; justify-content: space-between; border-bottom: 1px solid rgba(255,255,255,.16); }
.hero-card div:last-child { border-bottom: 0; }
.hero-card strong { font: 700 34px/1 Georgia, serif; }
.hero-card span { color: rgba(255,255,255,.72); font-size: 13px; }

.controls { position: sticky; top: 80px; z-index: 10; padding: 13px; display: grid; grid-template-columns: 1fr minmax(230px, .7fr) minmax(170px, .45fr); gap: 12px; background: rgba(255,253,248,.94); border: 1px solid var(--line); border-radius: 20px; box-shadow: 0 10px 32px rgba(23,58,50,.08); backdrop-filter: blur(16px); }
.part-tabs { display: flex; gap: 5px; overflow-x: auto; scrollbar-width: none; }
.part-tab { min-width: max-content; padding: 10px 14px; border: 0; border-radius: 12px; background: transparent; color: var(--muted); font-size: 13px; font-weight: 700; }
.part-tab.active { background: var(--forest); color: white; }
.search-box, .topic-select { height: 43px; display: flex; align-items: center; gap: 8px; padding: 0 12px; border: 1px solid var(--line); border-radius: 12px; background: white; color: var(--muted); font-size: 12px; }
.search-box input, .topic-select select { min-width: 0; width: 100%; border: 0; outline: 0; background: transparent; color: var(--ink); }

.study-heading { margin: 62px 0 22px; display: flex; align-items: end; justify-content: space-between; gap: 20px; }
h2 { margin: 0; color: var(--forest); font: 700 35px/1.1 Georgia, serif; }
.study-tools { display: grid; justify-items: end; gap: 9px; }
.result-count { margin: 0; color: var(--muted); font-size: 13px; }
.view-toggle { padding: 3px; display: flex; gap: 3px; background: #e9e5da; border-radius: 11px; }
.view-button { padding: 7px 11px; border: 0; border-radius: 8px; background: transparent; color: var(--muted); font-size: 12px; font-weight: 700; }
.view-button.active { background: var(--paper); color: var(--forest); box-shadow: 0 2px 8px rgba(23,58,50,.1); }
.lesson-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.lesson-list.grouped { grid-template-columns: 1fr; }
.story-group { overflow: hidden; background: rgba(255,253,248,.72); border: 1px solid var(--line); border-radius: 20px; box-shadow: 0 5px 18px rgba(23,58,50,.045); }
.story-header { width: 100%; padding: 19px 22px; display: grid; grid-template-columns: auto 1fr auto auto; gap: 16px; align-items: center; border: 0; background: transparent; color: var(--ink); text-align: left; }
.story-group.is-open .story-header { background: var(--forest); color: white; }
.story-part { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 13px; background: var(--sage); color: var(--forest); font-size: 11px; font-weight: 850; letter-spacing: .08em; }
.story-group.is-open .story-part { background: rgba(255,255,255,.14); color: white; }
.story-title-wrap { min-width: 0; display: grid; gap: 2px; }
.story-kind { color: var(--coral); font-size: 10px; font-weight: 850; letter-spacing: .13em; }
.story-title { overflow: hidden; white-space: nowrap; text-overflow: ellipsis; font: 700 20px/1.35 Georgia, "PingFang SC", serif; }
.story-progress { width: min(260px, 100%); height: 3px; margin-top: 7px; overflow: hidden; background: rgba(23,58,50,.11); border-radius: 99px; }
.story-group.is-open .story-progress { background: rgba(255,255,255,.16); }
.story-progress i { display: block; height: 100%; background: var(--coral); }
.story-count { display: grid; justify-items: end; color: var(--muted); line-height: 1.2; }
.story-group.is-open .story-count { color: rgba(255,255,255,.7); }
.story-count b { color: currentColor; font-size: 14px; }
.story-count small { margin-top: 3px; font-size: 9px; }
.story-chevron { color: var(--muted); font-size: 24px; transition: transform .2s; }
.story-group.is-open .story-chevron { color: white; transform: rotate(180deg); }
.story-body { padding: 18px; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.story-body[hidden] { display: none; }
.story-body .topic-name { display: none; }
.story-body .lesson-card { box-shadow: none; }
.lesson-card { position: relative; padding: 24px; background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: 0 5px 18px rgba(23,58,50,.045); transition: transform .2s, box-shadow .2s, border-color .2s; }
.lesson-card.playing { border-color: var(--coral); box-shadow: 0 15px 34px rgba(229,115,87,.14); transform: translateY(-2px); }
.card-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.part-chip { padding: 4px 9px; color: var(--forest); background: var(--sage); border-radius: 999px; font-size: 10px; font-weight: 850; letter-spacing: .12em; }
.star-button, .icon-button { border: 0; background: transparent; color: #9aa49f; font-size: 21px; }
.star-button.active { color: var(--gold); }
.topic-name { margin: 16px 0 5px; color: var(--muted); font-size: 12px; font-weight: 700; letter-spacing: .03em; }
.question { margin: 0; color: var(--forest); font: 700 20px/1.35 Georgia, serif; }
.transcript-block { margin: 18px 0; padding: 15px 17px; background: #f7f4eb; border: 1px solid #e7e1d4; border-radius: 13px; }
.transcript-heading { margin-bottom: 9px; display: flex; align-items: center; justify-content: space-between; gap: 12px; color: var(--coral); font-size: 11px; font-weight: 850; letter-spacing: .12em; }
.transcript-toggle { padding: 4px 7px; border: 0; background: transparent; color: var(--muted); font-size: 11px; letter-spacing: 0; }
.answer { margin: 0; color: #34433e; font-size: 15px; line-height: 1.82; }
.sentence { border-radius: 4px; transition: background .18s, color .18s; }
.sentence.active { background: #fde3d9; color: #7a2e1b; }
.card-actions { display: flex; align-items: center; gap: 10px; }
.play-button { width: 44px; height: 44px; border: 0; border-radius: 50%; background: var(--coral); color: white; font-size: 16px; box-shadow: 0 7px 16px rgba(229,115,87,.25); }
.complete-button { padding: 8px 11px; border: 1px solid var(--line); border-radius: 10px; background: white; color: var(--muted); font-size: 12px; }
.complete-button.done { border-color: var(--forest-2); background: var(--sage); color: var(--forest); font-weight: 700; }
.duration { margin-left: auto; color: var(--muted); font-size: 12px; }
.empty { grid-column: 1/-1; padding: 70px 20px; text-align: center; color: var(--muted); }
.load-more { display: block; margin: 28px auto 0; padding: 12px 22px; border: 1px solid var(--forest); border-radius: 999px; background: transparent; color: var(--forest); font-weight: 700; }

.player-bar { position: fixed; left: 50%; bottom: max(16px, env(safe-area-inset-bottom)); z-index: 30; width: min(820px, calc(100% - 28px)); transform: translateX(-50%); padding: 12px 16px; display: grid; grid-template-columns: 48px 1fr auto 40px; gap: 13px; align-items: center; background: rgba(23,58,50,.96); color: white; border: 1px solid rgba(255,255,255,.12); border-radius: 20px; box-shadow: 0 20px 60px rgba(10,30,24,.35); backdrop-filter: blur(18px); }
.player-toggle { width: 42px; height: 42px; border: 0; border-radius: 50%; background: var(--coral); color: white; }
.player-info { min-width: 0; display: grid; }
.player-info strong, .player-info span { overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.player-info strong { font-size: 13px; }
.player-info span { color: rgba(255,255,255,.65); font-size: 11px; }
.progress-track { height: 3px; margin-top: 8px; overflow: hidden; background: rgba(255,255,255,.15); border-radius: 99px; }
.progress-track span { display: block; width: 0; height: 100%; background: var(--coral); }
.speed-control { display: flex; align-items: center; gap: 6px; color: rgba(255,255,255,.65); font-size: 11px; }
.speed-control select { border: 0; background: transparent; color: white; }
.player-bar .icon-button { color: white; }
.player-bar .icon-button[aria-pressed="true"] { color: var(--gold); }
.toast { position: fixed; left: 50%; bottom: 102px; z-index: 50; transform: translate(-50%, 12px); padding: 10px 15px; opacity: 0; pointer-events: none; background: #111b18; color: white; border-radius: 10px; font-size: 12px; transition: .2s; }
.toast.show { opacity: 1; transform: translate(-50%, 0); }

@media (max-width: 820px) {
  .hero { min-height: 0; padding: 50px 0 42px; grid-template-columns: 1fr; gap: 34px; }
  .hero-card { grid-template-columns: repeat(3, 1fr); padding: 18px; }
  .hero-card div { padding: 10px; display: grid; gap: 7px; border: 0; border-right: 1px solid rgba(255,255,255,.14); text-align: center; }
  .hero-card div:last-child { border-right: 0; }
  .controls { top: 72px; grid-template-columns: 1fr 1fr; }
  .part-tabs { grid-column: 1/-1; }
  .lesson-list { grid-template-columns: 1fr; }
  .story-body { grid-template-columns: 1fr; }
}
@media (hover: none) and (pointer: coarse) {
  .quiet-button, .part-tab, .search-box, .topic-select, .view-button,
  .complete-button, .transcript-toggle, .load-more, .star-button, .icon-button {
    min-height: 44px;
  }
  .part-tab, .view-button, .complete-button, .transcript-toggle {
    padding-left: 14px;
    padding-right: 14px;
  }
  .star-button, .icon-button { min-width: 44px; }
  .lesson-card:hover { transform: none; }
}
@media (max-width: 560px) {
  .topbar { min-height: 61px; padding: 10px 14px; }
  .brand b { display: none; }
  .portal-link { padding:0 8px; font-size:12px; }
  .quiet-button { max-width: 175px; padding: 8px 10px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
  main { width: min(100% - 26px, 1160px); }
  h1 { font-size: 43px; }
  .hero-copy { font-size: 15px; }
  .hero-card { padding: 12px; border-radius: 20px; }
  .hero-card strong { font-size: 27px; }
  .controls { top: 68px; padding: 9px; grid-template-columns: 1fr; }
  .part-tabs, .search-box, .topic-select { grid-column: 1; }
  .topic-select { display: none; }
  .study-heading { margin-top: 44px; align-items: start; }
  .study-heading .eyebrow { display: none; }
  .study-tools { gap: 7px; }
  .story-header { padding: 15px; grid-template-columns: auto 1fr auto; gap: 11px; }
  .story-count { display: none; }
  .story-title { font-size: 17px; }
  .story-body { padding: 10px; gap: 10px; }
  h2 { font-size: 29px; }
  .lesson-card { padding: 20px; }
  .question { font-size: 19px; }
  .answer { font-size: 15px; }
  .player-bar { grid-template-columns: 45px 1fr 38px; padding: 10px 12px; border-radius: 17px; }
  .speed-control { display: none; }
}