:root {
  --ink: #17211f;
  --muted: #66716d;
  --paper: #f5f0e7;
  --card: #fffdf8;
  --line: #d9d2c6;
  --teal: #176b62;
  --teal-dark: #10514b;
  --mint: #dbe9df;
  --coral: #e46f50;
  --sand: #e8dcc8;
  --shadow: 0 20px 60px rgba(40, 48, 44, 0.1);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 82% 5%, rgba(23, 107, 98, 0.09), transparent 28rem),
    var(--paper);
  font-family: "Segoe UI", "Microsoft YaHei", system-ui, sans-serif;
}

button, input, select { font: inherit; }
button { color: inherit; }
button:focus-visible, input:focus-visible, select:focus-visible, summary:focus-visible {
  outline: 3px solid rgba(228, 111, 80, 0.35);
  outline-offset: 3px;
}

.shell { max-width: 1180px; margin: 0 auto; padding: 0 28px 56px; }
.topbar { min-height: 92px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); }
.brand { display: flex; gap: 12px; align-items: center; color: inherit; text-decoration: none; }
.brand-mark { width: 42px; height: 42px; display: grid; place-items: center; color: white; background: var(--teal); border-radius: 50%; font-weight: 800; letter-spacing: -1px; }
.brand strong, .brand small { display: block; }
.brand strong { font-family: Georgia, serif; letter-spacing: .06em; font-size: 15px; }
.brand small { color: var(--muted); margin-top: 2px; }
.header-actions { display: flex; gap: 10px; }
.ghost-button, .icon-button { border: 1px solid var(--line); background: rgba(255,255,255,.45); border-radius: 999px; cursor: pointer; }
.ghost-button { padding: 10px 16px; }
.icon-button { width: 42px; height: 42px; font-weight: 800; }

.hero { display: grid; grid-template-columns: 1.35fr .65fr; gap: 64px; padding: 64px 0 46px; align-items: end; }
.eyebrow { margin: 0 0 10px; color: var(--teal); font-size: 12px; font-weight: 800; letter-spacing: .18em; text-transform: uppercase; }
.hero h1 { margin: 0; font: 700 clamp(38px, 5vw, 66px)/1.06 Georgia, "Microsoft YaHei", serif; letter-spacing: -.04em; }
.hero h1 em { color: var(--teal); font-style: normal; }
.hero-copy { max-width: 640px; margin: 22px 0 0; color: var(--muted); line-height: 1.8; }
.jump-card { padding: 24px; background: var(--ink); color: white; border-radius: 20px 20px 20px 4px; box-shadow: var(--shadow); }
.jump-card label { display: block; color: #cdd6d2; font-size: 13px; margin-bottom: 12px; }
.jump-row { display: grid; grid-template-columns: auto 1fr auto; gap: 10px; align-items: center; }
.jump-row span { font: 700 14px Georgia, serif; color: #a9bbb5; }
.jump-row input { width: 100%; min-width: 70px; padding: 11px 8px; color: white; background: transparent; border: 0; border-bottom: 1px solid #60706b; font: 700 28px Georgia, serif; }
.jump-card p { margin: 10px 0 0; color: #9da9a5; font-size: 12px; }

.primary-button, .dark-button, .danger-button { border: 0; border-radius: 10px; padding: 11px 16px; cursor: pointer; font-weight: 700; }
.primary-button { background: var(--coral); color: white; }
.primary-button:hover { background: #cd5f43; }
.dark-button { background: var(--ink); color: white; }
.danger-button { background: #a94135; color: white; }
.large { min-width: 190px; padding: 15px 24px; }

.mode-tabs { display: grid; grid-template-columns: repeat(2, 1fr); border: 1px solid var(--line); border-bottom: 0; border-radius: 18px 18px 0 0; overflow: hidden; background: rgba(255,255,255,.28); }
.mode-tab { display: grid; grid-template-columns: 38px auto; grid-template-rows: auto auto; column-gap: 12px; text-align: left; padding: 20px 26px; background: transparent; border: 0; cursor: pointer; }
.mode-tab + .mode-tab { border-left: 1px solid var(--line); }
.mode-tab > span { grid-row: 1/3; align-self: center; font: 700 26px Georgia, serif; color: #aaa398; }
.mode-tab strong { font-size: 17px; }
.mode-tab small { color: var(--muted); margin-top: 3px; }
.mode-tab.is-active { background: var(--card); box-shadow: inset 0 -3px var(--teal); }
.mode-tab.is-active > span { color: var(--teal); }

.mode-panel { background: rgba(255,255,255,.34); border: 1px solid var(--line); border-radius: 0 0 18px 18px; padding: 34px; }
.question-card { padding: 34px; background: var(--card); border: 1px solid var(--line); border-radius: 16px; box-shadow: 0 12px 35px rgba(50, 55, 52, .06); }
.question-meta { display: flex; align-items: center; gap: 12px; }
.part-badge { padding: 5px 9px; border-radius: 4px; color: var(--teal-dark); background: var(--mint); font-size: 12px; font-weight: 800; letter-spacing: .08em; }
.question-id { color: var(--muted); font-size: 12px; font-weight: 700; letter-spacing: .13em; }
.question-heading { display: grid; grid-template-columns: 1fr auto; gap: 24px; align-items: center; }
.question-heading h2 { max-width: 900px; margin: 22px 0; font: 700 clamp(25px, 3vw, 38px)/1.25 Georgia, serif; }
.round-play { width: 52px; height: 52px; border-radius: 50%; border: 1px solid var(--line); color: white; background: var(--teal); cursor: pointer; }
.translation { border-top: 1px solid var(--line); }
.translation summary { display: flex; justify-content: space-between; padding: 16px 0 0; cursor: pointer; list-style: none; font-weight: 700; color: var(--teal-dark); }
.translation summary::-webkit-details-marker { display: none; }
.translation summary small { color: var(--muted); font-weight: 400; }
.translation-body { padding: 18px 20px; margin-top: 14px; background: #f1ece2; border-radius: 10px; color: #4f5955; line-height: 1.8; }
.translation-body p { margin: 0; }
.translation-question { color: var(--ink); font-weight: 700; margin-bottom: 10px !important; }

.section-title-row { display: flex; justify-content: space-between; align-items: end; gap: 24px; margin: 44px 0 18px; }
.section-title-row h3 { margin: 0; font: 700 30px Georgia, "Microsoft YaHei", serif; }
.listening-controls { display: flex; align-items: center; gap: 10px; }
.listening-controls label { color: var(--muted); font-size: 13px; }
.listening-controls select { border: 1px solid var(--line); border-radius: 8px; background: var(--card); padding: 10px; }

.sentence-list { display: grid; gap: 12px; }
.sentence-card { display: grid; grid-template-columns: 42px 1fr auto; gap: 16px; align-items: start; padding: 20px; border: 1px solid var(--line); border-radius: 12px; background: var(--card); transition: .2s ease; }
.sentence-card.is-speaking { border-color: var(--teal); box-shadow: 0 0 0 3px rgba(23, 107, 98, .11); }
.sentence-card.is-recording { border-color: var(--coral); box-shadow: 0 0 0 3px rgba(228, 111, 80, .12); }
.sentence-number { width: 38px; height: 38px; display: grid; place-items: center; border-radius: 50%; background: var(--sand); font: 700 14px Georgia, serif; }
.sentence-copy { margin: 3px 0 0; font: 19px/1.65 Georgia, serif; }
.sentence-actions { display: flex; gap: 8px; }
.sentence-actions button { white-space: nowrap; padding: 9px 11px; border: 1px solid var(--line); border-radius: 8px; background: white; cursor: pointer; }
.sentence-actions .record-button { color: var(--teal-dark); font-weight: 700; }
.sentence-actions .record-button.is-active { color: white; background: var(--coral); border-color: var(--coral); }
.sentence-result { grid-column: 2/4; display: grid; grid-template-columns: 1fr auto; gap: 14px; padding-top: 14px; border-top: 1px dashed var(--line); }
.sentence-result[hidden] { display: none; }
.transcript { color: var(--muted); line-height: 1.6; }
.transcript strong { color: var(--ink); }
.mini-score { min-width: 72px; text-align: center; }
.mini-score b { display: block; color: var(--teal); font: 700 28px Georgia, serif; }
.recording-tools { grid-column: 1/-1; display: flex; gap: 8px; flex-wrap: wrap; }
.recording-tools audio { height: 36px; max-width: 100%; }
.download-link { align-self: center; color: var(--teal-dark); font-size: 13px; }
.feedback-line { grid-column: 1/-1; margin: 0; color: #7a4a3d; font-size: 13px; }

.page-nav { display: grid; grid-template-columns: 1fr auto 1fr; gap: 16px; align-items: center; margin-top: 28px; }
.page-nav button { padding: 12px; border: 1px solid var(--line); background: transparent; border-radius: 9px; cursor: pointer; }
.page-nav button:last-child { justify-self: stretch; }
.page-nav span { color: var(--muted); font: 700 14px Georgia, serif; }

.mock-stage { min-height: 590px; display: grid; align-content: center; justify-items: center; text-align: center; padding: 34px; background: var(--ink); color: white; border-radius: 16px; position: relative; overflow: hidden; }
.mock-stage::before { content: ""; position: absolute; width: 460px; height: 460px; border: 1px solid rgba(255,255,255,.08); border-radius: 50%; top: -250px; right: -120px; }
.examiner { display: flex; gap: 18px; align-items: center; text-align: left; }
.examiner h2, .examiner p { margin: 3px 0; }
.examiner > div:last-child > p:last-child { color: #aeb9b5; }
.avatar { width: 72px; height: 72px; position: relative; border-radius: 50%; background: var(--sand); overflow: hidden; }
.avatar::before { content: ""; width: 23px; height: 23px; border-radius: 50%; background: var(--teal); position: absolute; left: 25px; top: 15px; }
.avatar span { width: 48px; height: 30px; border-radius: 50% 50% 0 0; background: var(--teal); position: absolute; left: 13px; bottom: 0; }
.mock-question { max-width: 760px; margin: 46px 0 20px; }
.mock-question span { color: #93aaa3; font-size: 12px; letter-spacing: .16em; }
.mock-question h3 { margin: 14px 0; font: 700 clamp(26px, 4vw, 44px)/1.25 Georgia, serif; }
.mock-question p { color: #aeb9b5; }
.mock-timer { margin: 10px 0 24px; font: 700 24px Georgia, serif; color: #9fd0c4; }
.mock-actions { display: flex; gap: 12px; }
.result-panel { width: min(820px, 100%); margin-top: 28px; padding: 26px; color: var(--ink); background: #fffdf8; border-radius: 14px; text-align: left; }
.result-panel h3 { margin-top: 0; }
.score-grid { display: grid; grid-template-columns: 120px repeat(4, 1fr); gap: 10px; }
.overall-score, .metric { padding: 14px; border-radius: 10px; background: #f1ece2; }
.overall-score { color: white; background: var(--teal); }
.overall-score b { display: block; font: 700 36px Georgia, serif; }
.metric b { display: block; font: 700 23px Georgia, serif; color: var(--teal); }
.metric span, .overall-score span { font-size: 12px; }
.result-transcript { margin: 18px 0; padding: 14px; background: #f6f2ea; border-left: 3px solid var(--coral); line-height: 1.65; }
.result-panel ul { color: var(--muted); line-height: 1.75; }
.result-audio { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }

dialog { border: 0; padding: 0; color: var(--ink); background: var(--card); box-shadow: var(--shadow); }
dialog::backdrop { background: rgba(15, 25, 22, .55); backdrop-filter: blur(4px); }
.sheet-dialog { width: min(920px, calc(100% - 32px)); max-height: 82vh; border-radius: 18px; padding: 28px; }
.help-dialog { width: min(600px, calc(100% - 32px)); border-radius: 18px; padding: 28px; }
.dialog-header { display: flex; justify-content: space-between; align-items: start; }
.dialog-header h2 { margin: 0; font: 700 30px Georgia, "Microsoft YaHei", serif; }
.dialog-header button { width: 38px; height: 38px; border: 0; background: #eee8de; border-radius: 50%; cursor: pointer; font-size: 22px; }
.question-map { display: grid; grid-template-columns: repeat(6, 1fr); gap: 9px; margin-top: 24px; }
.question-map button { padding: 14px 6px; border: 1px solid var(--line); border-radius: 9px; background: white; cursor: pointer; }
.question-map button.is-current { color: white; background: var(--teal); border-color: var(--teal); }
.question-map button.has-score::after { content: "•"; color: var(--coral); margin-left: 3px; }
.help-dialog ol { padding-left: 22px; line-height: 1.9; }
.note { padding: 14px; background: #f1ece2; border-radius: 9px; color: var(--muted); }
.toast { position: fixed; left: 50%; bottom: 28px; transform: translate(-50%, 20px); max-width: calc(100% - 32px); padding: 12px 18px; color: white; background: var(--ink); border-radius: 999px; opacity: 0; pointer-events: none; transition: .2s ease; z-index: 20; }
.toast.is-visible { opacity: 1; transform: translate(-50%, 0); }

@media (max-width: 760px) {
  .shell { padding: 0 16px 32px; }
  .topbar { min-height: 74px; }
  .brand strong { font-size: 13px; }
  .hero { grid-template-columns: 1fr; gap: 30px; padding: 42px 0 32px; }
  .hero h1 { font-size: 42px; }
  .mode-tab { padding: 16px 12px; grid-template-columns: 30px auto; }
  .mode-tab > span { font-size: 20px; }
  .mode-tab small { display: none; }
  .mode-panel { padding: 14px; }
  .question-card { padding: 22px; }
  .question-heading { grid-template-columns: 1fr; }
  .round-play { justify-self: start; }
  .section-title-row { align-items: stretch; flex-direction: column; }
  .listening-controls { flex-wrap: wrap; }
  .sentence-card { grid-template-columns: 34px 1fr; }
  .sentence-actions { grid-column: 1/-1; }
  .sentence-result { grid-column: 1/-1; }
  .question-map { grid-template-columns: repeat(4, 1fr); }
  .score-grid { grid-template-columns: 1fr 1fr; }
  .overall-score { grid-column: 1/-1; }
  .mock-stage { padding: 28px 18px; }
  .examiner { align-items: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}