:root {
  --ink: #182523;
  --ink-soft: #52615e;
  --deep: #183a3a;
  --deep-2: #24504d;
  --paper: #f1eadc;
  --paper-light: #fbf7ee;
  --paper-dark: #dfd3c0;
  --line: rgba(24, 37, 35, 0.16);
  --coral: #df5a40;
  --coral-dark: #aa3d2b;
  --sun: #f0b84b;
  --mint: #b8d4c8;
  --success: #2d7556;
  --danger: #a84334;
  --shadow: 0 18px 60px rgba(40, 45, 37, 0.12);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
  --display: "Palatino Linotype", "Book Antiqua", STKaiti, serif;
  --body: Bahnschrift, "Microsoft YaHei", sans-serif;
  --font-scale: 1;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

html {
  font-size: calc(16px * var(--font-scale));
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at 86% 5%, rgba(240, 184, 75, 0.22), transparent 27rem),
    linear-gradient(135deg, #f5efe4, #ece2d1);
  font-family: var(--body);
  line-height: 1.58;
}

button, input, textarea, select { font: inherit; }
button { color: inherit; }
button:focus-visible, input:focus-visible, textarea:focus-visible, select:focus-visible {
  outline: 3px solid rgba(223, 90, 64, 0.35);
  outline-offset: 2px;
}

.paper-noise {
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.28;
  z-index: 20;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.12'/%3E%3C/svg%3E");
  mix-blend-mode: multiply;
}

.app-shell { min-height: 100vh; }

.side-rail {
  position: fixed;
  inset: 0 auto 0 0;
  width: 230px;
  display: flex;
  flex-direction: column;
  padding: 32px 22px 26px;
  color: var(--paper-light);
  background:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px),
    var(--deep);
  background-size: 24px 24px;
  z-index: 10;
}

.brand {
  display: flex;
  align-items: center;
  gap: 13px;
  padding: 0;
  border: 0;
  color: inherit;
  background: none;
  cursor: pointer;
  text-align: left;
}

.brand-mark {
  display: grid;
  width: 47px;
  height: 47px;
  place-items: center;
  border: 1px solid rgba(255,255,255,0.32);
  border-radius: 50%;
  color: var(--sun);
  font-family: var(--display);
  font-size: 1.5rem;
  box-shadow: inset 0 0 0 5px rgba(255,255,255,0.04);
}

.brand-copy { display: grid; line-height: 1.1; }
.brand-copy strong { font-family: var(--display); font-size: 1.15rem; letter-spacing: .06em; }
.brand-copy small { margin-top: 6px; color: rgba(255,255,255,.55); font-size: .57rem; letter-spacing: .18em; }

.main-nav { display: grid; gap: 6px; margin: 50px -6px 0; }
.nav-item {
  position: relative;
  display: grid;
  grid-template-columns: 32px 1fr;
  align-items: center;
  gap: 8px;
  min-height: 47px;
  padding: 8px 13px;
  border: 0;
  border-radius: 10px;
  color: rgba(255,255,255,.62);
  background: transparent;
  cursor: pointer;
  text-align: left;
  transition: color .2s ease, background .2s ease, transform .2s ease;
}
.nav-item:hover { color: white; transform: translateX(3px); }
.nav-item.is-active { color: white; background: rgba(255,255,255,.10); }
.nav-item.is-active::after {
  content: "";
  position: absolute;
  right: -16px;
  width: 5px;
  height: 26px;
  border-radius: 6px 0 0 6px;
  background: var(--coral);
}
.nav-index { color: var(--sun); font-size: .65rem; letter-spacing: .12em; }
.rail-foot { margin-top: auto; color: rgba(255,255,255,.38); font-size: .64rem; letter-spacing: .12em; }
.rail-foot .ghost-button { margin-bottom: 14px; color: white; border-color: rgba(255,255,255,.2); }

.main-stage { min-height: 100vh; margin-left: 230px; padding: 38px clamp(26px, 5vw, 78px) 70px; }
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  max-width: 1260px;
  margin: 0 auto 32px;
}
.eyebrow { margin: 0 0 8px; color: var(--coral-dark); font-size: .68rem; font-weight: 700; letter-spacing: .19em; }
h1, h2, h3, p { overflow-wrap: anywhere; }
h1, h2, h3 { margin-top: 0; font-family: var(--display); line-height: 1.18; }
h1 { margin-bottom: 0; font-size: clamp(2rem, 4vw, 3.15rem); font-weight: 500; letter-spacing: -.035em; }
h2 { font-size: clamp(1.45rem, 2.5vw, 2.05rem); font-weight: 500; }
h3 { font-size: 1.18rem; font-weight: 600; }
.topbar-meta { display: flex; align-items: center; gap: 12px; }
.streak-pill { display: flex; align-items: center; gap: 7px; padding: 9px 14px; border: 1px solid var(--line); border-radius: 999px; background: rgba(255,255,255,.34); font-size: .77rem; }
.streak-pill span { color: var(--coral); font-size: 1.1rem; }
.avatar-button, .icon-button {
  display: grid;
  place-items: center;
  border: 0;
  cursor: pointer;
}
.avatar-button { width: 40px; height: 40px; border-radius: 50%; color: var(--paper-light); background: var(--deep); }
.icon-button { width: 38px; height: 38px; border-radius: 50%; background: var(--paper); font-size: 1.35rem; }

.screen { display: none; max-width: 1260px; margin: 0 auto; animation: screen-in .42s cubic-bezier(.2,.8,.2,1); }
.screen.is-active { display: block; }
@keyframes screen-in { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }

.hero-grid { display: grid; grid-template-columns: minmax(0, 1.55fr) minmax(270px, .75fr); gap: 20px; }
.hero-card {
  position: relative;
  min-height: 320px;
  padding: clamp(26px, 4vw, 48px);
  overflow: hidden;
  border-radius: var(--radius-xl);
  color: var(--paper-light);
  background: var(--deep);
  box-shadow: var(--shadow);
}
.hero-card::after {
  content: "LOOP";
  position: absolute;
  right: -18px;
  bottom: -52px;
  color: rgba(255,255,255,.045);
  font-family: var(--display);
  font-size: clamp(7rem, 16vw, 14rem);
  line-height: 1;
}
.hero-card::before {
  content: "";
  position: absolute;
  top: -90px;
  right: -70px;
  width: 260px;
  height: 260px;
  border: 1px solid rgba(240,184,75,.25);
  border-radius: 50%;
  box-shadow: inset 0 0 0 34px rgba(255,255,255,.018), inset 0 0 0 72px rgba(255,255,255,.018);
}
.hero-card > * { position: relative; z-index: 1; }
.hero-card .eyebrow { color: var(--sun); }
.hero-card h2 { max-width: 630px; margin-bottom: 14px; font-size: clamp(1.9rem, 4vw, 3.2rem); }
.hero-card p { max-width: 650px; color: rgba(255,255,255,.7); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }

.goal-card, .paper-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: rgba(251,247,238,.7);
  box-shadow: 0 10px 35px rgba(40,45,37,.07);
}
.goal-card { display: flex; flex-direction: column; justify-content: space-between; padding: 28px; }
.goal-ring {
  --progress: 0deg;
  display: grid;
  width: 142px;
  height: 142px;
  place-items: center;
  margin: 8px auto 18px;
  border-radius: 50%;
  background: conic-gradient(var(--coral) var(--progress), var(--paper-dark) 0);
}
.goal-ring::before { content: ""; grid-area: 1/1; width: 112px; height: 112px; border-radius: 50%; background: var(--paper-light); }
.goal-ring-copy { grid-area: 1/1; position: relative; display: grid; text-align: center; line-height: 1.05; }
.goal-ring-copy strong { font-family: var(--display); font-size: 2rem; }
.goal-ring-copy small { margin-top: 7px; color: var(--ink-soft); font-size: .68rem; }
.goal-meta { display: flex; justify-content: space-between; padding-top: 15px; border-top: 1px solid var(--line); color: var(--ink-soft); font-size: .78rem; }
.goal-meta strong { display: block; color: var(--ink); font-size: 1.05rem; }

.section-head { display: flex; justify-content: space-between; align-items: end; gap: 20px; margin: 44px 0 18px; }
.section-head h2 { margin-bottom: 0; }
.section-head p { margin: 0; color: var(--ink-soft); font-size: .82rem; }
.module-grid { display: grid; grid-template-columns: repeat(5, minmax(0,1fr)); gap: 14px; }
.module-card {
  position: relative;
  min-height: 210px;
  padding: 23px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(251,247,238,.75);
  cursor: pointer;
  text-align: left;
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}
.module-card:hover { transform: translateY(-5px); border-color: rgba(24,58,58,.35); box-shadow: 0 16px 38px rgba(40,45,37,.1); }
.module-card .module-number { color: var(--coral); font-size: .68rem; letter-spacing: .15em; }
.module-card h3 { margin: 37px 0 8px; font-size: 1.35rem; }
.module-card p { margin: 0; color: var(--ink-soft); font-size: .78rem; }
.module-card .arrow { position: absolute; right: 20px; bottom: 16px; color: var(--coral); font-size: 1.25rem; }
.module-card:nth-child(2) { background: var(--mint); }
.module-card:nth-child(3) { background: #eed5bd; }
.module-card:nth-child(4) { color: var(--paper-light); background: var(--deep-2); }
.module-card:nth-child(4) p { color: rgba(255,255,255,.62); }
.module-card:nth-child(5) { background: #e8dfca; }

.vocab-overview {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(460px, .85fr);
  gap: 32px;
  align-items: end;
  padding: clamp(25px, 4vw, 44px);
  border-radius: var(--radius-xl);
  color: var(--paper-light);
  background:
    radial-gradient(circle at 8% 0%, rgba(240,184,75,.2), transparent 18rem),
    var(--deep);
  box-shadow: var(--shadow);
}
.vocab-overview h2 { margin-bottom: 12px; font-size: clamp(1.8rem, 3vw, 2.8rem); }
.vocab-overview p:last-child { max-width: 620px; color: rgba(255,255,255,.65); }
.vocab-stats { display: grid; grid-template-columns: repeat(4,1fr); gap: 8px; }
.vocab-stat { display: grid; min-height: 94px; align-content: center; padding: 14px; border: 1px solid rgba(255,255,255,.12); border-radius: 15px; background: rgba(255,255,255,.05); text-align: center; }
.vocab-stat strong { color: var(--sun); font-family: var(--display); font-size: 1.7rem; }
.vocab-stat span { color: rgba(255,255,255,.55); font-size: .66rem; }
.vocab-progress-line { height: 5px; margin: 15px 20px 0; overflow: hidden; border-radius: 99px; background: var(--paper-dark); }
.vocab-progress-line span { display: block; height: 100%; border-radius: inherit; background: var(--coral); }
.vocab-toolbar { margin-top: 24px; }
.word-card { position: relative; max-width: 820px; min-height: 520px; margin: 0 auto; padding: clamp(25px, 5vw, 52px); overflow: hidden; }
.word-card::after { content: "Aa"; position: absolute; right: -10px; bottom: -72px; z-index: 0; color: rgba(24,58,58,.035); font-family: var(--display); font-size: 14rem; line-height: 1; }
.word-card > * { position: relative; z-index: 1; }
.word-card-top { display: flex; justify-content: space-between; align-items: center; padding-right: 52px; }
.save-word-button { position: absolute; top: 27px; right: 27px; width: 43px; height: 43px; border: 1px solid var(--line); border-radius: 50%; color: var(--ink-soft); background: transparent; cursor: pointer; font-size: 1.3rem; }
.save-word-button.is-saved { color: var(--coral); background: rgba(240,184,75,.13); }
.word-face { display: grid; justify-items: center; margin: 62px 0 32px; text-align: center; }
.word-rank { margin: 0; color: var(--coral-dark); font-size: .65rem; font-weight: 700; letter-spacing: .15em; }
.word-title { margin: 8px 0 12px; font-size: clamp(3.5rem, 9vw, 6.8rem); font-weight: 500; letter-spacing: -.055em; }
.pronounce-button { display: inline-flex; align-items: center; gap: 8px; padding: 7px 13px; border: 0; border-radius: 999px; color: var(--deep); background: rgba(184,212,200,.5); cursor: pointer; font-size: .78rem; }
.word-pos { margin-top: 10px; color: var(--ink-soft); font-size: .72rem; }
.word-answer { display: grid; gap: 14px; max-width: 650px; margin: 0 auto 28px; animation: screen-in .3s ease; }
.word-translation { margin: 0; padding: 18px; border-left: 4px solid var(--coral); background: rgba(223,90,64,.07); font-size: 1rem; }
.word-definition, .word-forms { margin: 0; color: var(--ink-soft); font-size: .78rem; }
.word-example { margin: 0; padding: 15px 18px; border: 1px solid var(--line); border-radius: 12px; font-family: var(--display); }
.word-example small { display: block; margin-top: 7px; color: var(--ink-soft); font-family: var(--body); }
.reveal-word-button { display: block; min-width: 180px; margin: 50px auto 0; }
.rating-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 9px; margin-top: 24px; }
.rating-grid button { min-height: 72px; padding: 10px; border: 1px solid var(--line); border-radius: 13px; background: rgba(255,255,255,.32); cursor: pointer; }
.rating-grid button:hover { color: white; border-color: var(--deep); background: var(--deep); }
.rating-grid strong, .rating-grid small { display: block; }
.rating-grid small { margin-top: 4px; color: var(--ink-soft); font-size: .61rem; }
.rating-grid button:hover small { color: rgba(255,255,255,.6); }
.dictionary-panel { min-height: 500px; }
.dictionary-search { display: grid; grid-template-columns: auto 1fr; align-items: center; gap: 10px; max-width: 760px; padding: 12px 17px; border: 1px solid var(--line); border-radius: 999px; background: white; }
.dictionary-search span { color: var(--coral); font-size: 1.4rem; }
.dictionary-search input { min-width: 0; border: 0; outline: 0; background: transparent; }
.dictionary-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 11px; margin-top: 25px; }
.dictionary-card { position: relative; padding: 18px; border: 1px solid var(--line); border-radius: var(--radius-md); background: rgba(255,255,255,.25); }
.dictionary-card > p { min-height: 50px; margin: 12px 0; color: var(--ink-soft); font-size: .75rem; }
.dictionary-word { display: inline-grid; gap: 2px; padding: 0; border: 0; background: transparent; cursor: pointer; text-align: left; }
.dictionary-word strong { font-family: var(--display); font-size: 1.35rem; }
.dictionary-word small { color: var(--coral-dark); font-size: .65rem; }
.save-inline { float: right; padding: 4px 8px; border: 0; color: var(--ink-soft); background: transparent; cursor: pointer; font-size: .66rem; }
.save-inline.is-saved { color: var(--coral-dark); }

.stats-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 18px; }
.paper-card { padding: clamp(20px, 3vw, 30px); }
.weekly-bars { display: grid; grid-template-columns: repeat(7,1fr); align-items: end; gap: 12px; height: 155px; padding-top: 20px; }
.bar-day { display: grid; grid-template-rows: 1fr auto; align-items: end; gap: 7px; height: 100%; text-align: center; color: var(--ink-soft); font-size: .65rem; }
.bar-track { display: flex; align-items: end; justify-content: center; height: 100%; border-radius: 8px; background: rgba(24,58,58,.06); }
.bar-fill { width: 100%; min-height: 3px; border-radius: 8px; background: var(--deep); transition: height .6s ease; }
.bar-day.today .bar-fill { background: var(--coral); }
.skill-list { display: grid; gap: 15px; margin-top: 24px; }
.skill-row { display: grid; grid-template-columns: 50px 1fr 34px; align-items: center; gap: 10px; font-size: .76rem; }
.skill-track { height: 8px; overflow: hidden; border-radius: 99px; background: var(--paper-dark); }
.skill-fill { height: 100%; border-radius: inherit; background: var(--deep-2); }

.workspace-grid { display: grid; grid-template-columns: minmax(220px,.7fr) minmax(0,1.8fr); gap: 20px; align-items: start; }
.lesson-list, .scenario-list { display: grid; gap: 9px; }
.lesson-list, .scenario-list { max-height: calc(100vh - 150px); padding-right: 4px; overflow-y: auto; overscroll-behavior: contain; }
.lesson-list-button, .scenario-button {
  width: 100%;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(251,247,238,.62);
  cursor: pointer;
  text-align: left;
  transition: .2s ease;
}
.lesson-list-button:hover, .scenario-button:hover { border-color: var(--deep); }
.lesson-list-button.is-active, .scenario-button.is-active { color: white; border-color: var(--deep); background: var(--deep); }
.lesson-list-button strong, .scenario-button strong { display: block; font-family: var(--display); font-size: 1rem; }
.lesson-list-button small, .scenario-button small { color: var(--ink-soft); }
.lesson-list-button.is-active small, .scenario-button.is-active small { color: rgba(255,255,255,.6); }

.reading-card { padding: clamp(24px,4vw,44px); }
.reading-meta { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }
.chip, .score-chip { display: inline-flex; align-items: center; min-height: 26px; padding: 4px 9px; border-radius: 999px; font-size: .68rem; }
.chip { color: var(--deep); background: rgba(184,212,200,.65); }
.score-chip { color: white; background: var(--deep); }
.reading-paragraph { margin: 24px 0; font-family: var(--display); font-size: clamp(1.22rem,2.1vw,1.7rem); line-height: 1.75; }
.sentence-stack { display: grid; gap: 12px; margin-top: 26px; }
.sentence-card { border: 1px solid var(--line); border-radius: var(--radius-md); background: rgba(255,255,255,.22); }
.sentence-head { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 12px; width: 100%; padding: 16px; border: 0; background: transparent; cursor: pointer; text-align: left; }
.sentence-index { color: var(--coral); font-size: .68rem; }
.sentence-en { font-family: var(--display); font-size: 1.04rem; }
.sentence-detail { display: none; padding: 0 18px 18px 48px; }
.sentence-card.is-open .sentence-detail { display: block; animation: screen-in .25s ease; }
.chunk-line { display: flex; flex-wrap: wrap; gap: 7px; margin: 0 0 14px; }
.chunk { padding: 5px 9px; border-bottom: 2px solid var(--sun); background: rgba(240,184,75,.1); font-family: var(--display); }
.translation-line { padding: 12px 14px; border-left: 3px solid var(--coral); background: rgba(223,90,64,.07); }
.grammar-note { color: var(--ink-soft); font-size: .8rem; }

.training-card { max-width: 900px; margin: 0 auto; padding: clamp(24px,5vw,52px); }
.translation-page-tabs { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); max-width: 600px; margin: 0 auto 18px; padding: 5px; border: 1px solid var(--line); border-radius: 16px; background: rgba(251,247,238,.58); }
.translation-page-tabs button { display: flex; justify-content: center; gap: 12px; padding: 11px; border: 0; border-radius: 11px; color: var(--ink-soft); background: transparent; cursor: pointer; }
.translation-page-tabs button span { color: var(--coral); font-size: .65rem; }
.translation-page-tabs button.is-active { color: white; background: var(--deep); }
.free-translation-layout { display: grid; grid-template-columns: minmax(0,1.6fr) minmax(260px,.6fr); gap: 18px; align-items: start; }
.translator-card { padding: clamp(23px,4vw,38px); }
.translator-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 18px; }
.translator-head h2 { margin-bottom: 23px; }
.translator-pane { display: block; position: relative; padding: 18px; border: 1px solid var(--line); border-radius: var(--radius-md); background: rgba(255,255,255,.28); }
.translator-pane > span { display: block; margin-bottom: 10px; color: var(--coral-dark); font-size: .66rem; font-weight: 700; letter-spacing: .1em; }
.translator-pane textarea { width: 100%; min-height: 150px; resize: vertical; border: 0; outline: 0; color: var(--ink); background: transparent; font-family: var(--display); font-size: 1.15rem; line-height: 1.65; }
.translator-pane > small { display: block; color: var(--ink-soft); text-align: right; font-size: .64rem; }
.translator-divider { display: grid; place-items: center; height: 30px; }
.translator-divider span { display: grid; width: 31px; height: 31px; place-items: center; border: 1px solid var(--line); border-radius: 50%; color: white; background: var(--deep); }
.result-pane { min-height: 170px; background: rgba(184,212,200,.18); }
.translator-output { min-height: 105px; white-space: normal; font-family: var(--display); font-size: 1.13rem; line-height: 1.7; }
.translator-actions { margin-top: 20px; }
.translation-history { padding: 22px; }
.translation-history-list { display: grid; gap: 8px; }
.translation-history-item { display: grid; gap: 5px; width: 100%; padding: 13px; border: 1px solid var(--line); border-radius: 12px; background: rgba(255,255,255,.25); cursor: pointer; text-align: left; }
.translation-history-item:hover { border-color: var(--deep); }
.translation-history-item > span { color: var(--coral-dark); font-size: .61rem; }
.translation-history-item strong { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-family: var(--display); }
.translation-history-item small { display: -webkit-box; overflow: hidden; color: var(--ink-soft); font-size: .67rem; -webkit-box-orient: vertical; -webkit-line-clamp: 2; }
.empty-translation-history { padding: 45px 12px; color: var(--ink-soft); text-align: center; font-size: .75rem; }
.mode-switch { display: inline-flex; padding: 4px; border: 1px solid var(--line); border-radius: 999px; background: var(--paper-dark); }
.mode-switch button { padding: 7px 14px; border: 0; border-radius: 999px; background: transparent; cursor: pointer; font-size: .75rem; }
.mode-switch button.is-active { color: white; background: var(--deep); }
.prompt-block { margin: 30px 0 22px; }
.prompt-label { color: var(--coral-dark); font-size: .68rem; font-weight: 700; letter-spacing: .12em; }
.prompt-text { margin: 10px 0 0; font-family: var(--display); font-size: clamp(1.3rem,3vw,2rem); line-height: 1.5; }
.answer-box { width: 100%; min-height: 142px; resize: vertical; padding: 17px; border: 1px solid var(--line); border-radius: var(--radius-md); color: var(--ink); background: rgba(255,255,255,.45); line-height: 1.65; }
.answer-box::placeholder { color: #8b938e; }
.action-row { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-top: 15px; }
.primary-button, .secondary-button, .ghost-button, .danger-button {
  min-height: 43px;
  padding: 9px 17px;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 650;
  transition: transform .18s ease, filter .18s ease;
}
.primary-button:hover, .secondary-button:hover, .ghost-button:hover, .danger-button:hover { transform: translateY(-1px); filter: brightness(1.03); }
.primary-button { border: 1px solid var(--deep); color: white; background: var(--deep); }
.secondary-button { border: 1px solid var(--coral); color: white; background: var(--coral); }
.ghost-button { border: 1px solid var(--line); background: transparent; }
.danger-button { border: 1px solid rgba(168,67,52,.35); color: var(--danger); background: transparent; }
.compact { min-height: 34px; padding: 5px 11px; font-size: .72rem; }
.button-icon { margin-right: 6px; }
.feedback-card { display: none; margin-top: 24px; padding: 21px; border-radius: var(--radius-md); background: #e5eadf; }
.feedback-card.is-visible { display: block; animation: screen-in .3s ease; }
.feedback-card.is-low { background: #f3ded4; }
.score-line { display: flex; align-items: center; gap: 12px; }
.score-number { font-family: var(--display); font-size: 2rem; color: var(--deep); }
.feedback-detail { margin: 12px 0 0; color: var(--ink-soft); font-size: .82rem; }
.reference-answer { margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--line); }

.listen-stage, .speak-stage { text-align: center; }
.audio-orbit {
  position: relative;
  display: grid;
  width: 158px;
  height: 158px;
  place-items: center;
  margin: 10px auto 25px;
  border: 1px solid rgba(24,58,58,.25);
  border-radius: 50%;
}
.audio-orbit::before, .audio-orbit::after { content: ""; position: absolute; border: 1px solid rgba(24,58,58,.11); border-radius: 50%; }
.audio-orbit::before { inset: 15px; }
.audio-orbit::after { inset: 31px; }
.play-button, .record-button { position: relative; z-index: 1; display: grid; width: 68px; height: 68px; place-items: center; border: 0; border-radius: 50%; color: white; background: var(--coral); cursor: pointer; font-size: 1.3rem; box-shadow: 0 8px 24px rgba(168,61,43,.3); }
.record-button { background: var(--deep); }
.audio-orbit.is-playing { animation: orbit-pulse 1.5s infinite; }
.audio-orbit.is-recording { border-color: var(--coral); animation: orbit-pulse .9s infinite; }
@keyframes orbit-pulse { 50% { transform: scale(1.035); box-shadow: 0 0 0 16px rgba(223,90,64,.06); } }
.masked-sentence { margin: 20px 0; color: var(--ink-soft); font-family: var(--display); font-size: 1.3rem; letter-spacing: .12em; }
.speed-control { display: flex; justify-content: center; align-items: center; gap: 12px; color: var(--ink-soft); font-size: .75rem; }
.speed-control input { width: min(280px, 55vw); accent-color: var(--coral); }
.hint-box { margin: 20px 0; padding: 13px; border-radius: 12px; color: var(--deep); background: rgba(184,212,200,.38); font-family: var(--display); }
.status-line { min-height: 26px; margin: 12px 0; color: var(--ink-soft); font-size: .8rem; }

.conversation-layout { display: grid; grid-template-columns: 280px minmax(0,1fr); gap: 20px; }
.chat-panel { display: flex; flex-direction: column; min-height: 650px; padding: 0; overflow: hidden; }
.chat-header { display: flex; align-items: center; justify-content: space-between; gap: 15px; padding: 22px 25px; color: white; background: var(--deep); }
.chat-header h2 { margin: 0; font-size: 1.35rem; }
.chat-header p { margin: 4px 0 0; color: rgba(255,255,255,.58); font-size: .72rem; }
.chat-progress { white-space: nowrap; color: var(--sun); font-size: .72rem; }
.chat-log { flex: 1; display: flex; flex-direction: column; gap: 14px; padding: 26px; overflow-y: auto; max-height: 470px; background: rgba(255,255,255,.18); }
.message { max-width: min(78%, 620px); padding: 13px 16px; border-radius: 18px; font-size: .88rem; }
.message.bot { align-self: flex-start; border-bottom-left-radius: 4px; background: var(--paper-dark); }
.message.user { align-self: flex-end; border-bottom-right-radius: 4px; color: white; background: var(--deep-2); }
.message.coach { align-self: center; max-width: 92%; color: var(--coral-dark); border: 1px dashed rgba(168,61,43,.35); background: rgba(223,90,64,.06); text-align: center; font-size: .76rem; }
.message small { display: block; margin-top: 5px; opacity: .66; }
.chat-compose { padding: 18px 22px; border-top: 1px solid var(--line); background: var(--paper-light); }
.chat-goal { margin: 0 0 10px; color: var(--ink-soft); font-size: .74rem; }
.compose-row { display: grid; grid-template-columns: auto 1fr auto; gap: 8px; }
.compose-row input { min-width: 0; padding: 11px 14px; border: 1px solid var(--line); border-radius: 999px; background: white; }

.review-toolbar { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; margin-bottom: 18px; }
.review-list { display: grid; gap: 12px; }
.mistake-card { display: grid; grid-template-columns: 1fr auto; gap: 18px; padding: 20px; border: 1px solid var(--line); border-radius: var(--radius-lg); background: rgba(251,247,238,.72); }
.mistake-card.is-mastered { opacity: .55; }
.mistake-source { margin: 4px 0 8px; font-family: var(--display); font-size: 1.08rem; }
.mistake-answer { margin: 6px 0; color: var(--danger); font-size: .78rem; }
.mistake-reference { margin: 6px 0; color: var(--success); font-size: .78rem; }
.mistake-actions { display: flex; flex-direction: column; gap: 7px; justify-content: center; }
.empty-state { padding: 70px 20px; text-align: center; }
.empty-mark { display: grid; width: 72px; height: 72px; place-items: center; margin: 0 auto 20px; border: 1px solid var(--line); border-radius: 50%; color: var(--coral); font-family: var(--display); font-size: 1.7rem; }
.empty-state p { color: var(--ink-soft); }
.data-panel { display: grid; grid-template-columns: 1fr auto; gap: 20px; align-items: center; margin-top: 24px; }
.data-panel p { margin: 4px 0 0; color: var(--ink-soft); font-size: .76rem; }
.data-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.file-input { display: none; }

.settings-dialog { width: min(520px, calc(100vw - 28px)); padding: 0; border: 0; border-radius: var(--radius-xl); background: transparent; box-shadow: var(--shadow); }
.settings-dialog::backdrop { background: rgba(10,25,24,.58); backdrop-filter: blur(4px); }
.dialog-card { padding: 28px; background: var(--paper-light); }
.dialog-head { display: flex; justify-content: space-between; align-items: flex-start; }
.dialog-head h2 { margin-bottom: 26px; }
.field-label { display: block; margin: 19px 0 6px; font-size: .78rem; font-weight: 700; }
.range-row { display: grid; grid-template-columns: 1fr 74px; align-items: center; gap: 14px; }
.range-row input { accent-color: var(--coral); }
.range-row output { color: var(--ink-soft); text-align: right; font-size: .75rem; }
.dialog-actions { display: flex; justify-content: flex-end; gap: 9px; margin-top: 30px; }

.toast-region { position: fixed; right: 22px; bottom: 22px; display: grid; gap: 9px; z-index: 100; }
.toast { max-width: min(360px, calc(100vw - 44px)); padding: 12px 16px; border-radius: 12px; color: white; background: var(--deep); box-shadow: var(--shadow); animation: toast-in .25s ease; font-size: .78rem; }
@keyframes toast-in { from { opacity: 0; transform: translateY(10px); } }

.mobile-nav { display: none; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.muted { color: var(--ink-soft); }
.text-coral { color: var(--coral-dark); }
.divider { height: 1px; margin: 22px 0; background: var(--line); }

@media (max-width: 1120px) {
  .module-grid { grid-template-columns: repeat(2,1fr); }
  .workspace-grid { grid-template-columns: 1fr; }
  .lesson-list { grid-template-columns: repeat(3,1fr); }
  .lesson-list { max-height: 310px; }
  .conversation-layout { grid-template-columns: 220px minmax(0,1fr); }
  .vocab-overview { grid-template-columns: 1fr; }
  .free-translation-layout { grid-template-columns: 1fr; }
}

@media (max-width: 820px) {
  body { padding-bottom: calc(70px + env(safe-area-inset-bottom)); }
  .paper-noise { opacity: .2; }
  .side-rail { display: none; }
  .main-stage { margin-left: 0; padding: 24px 18px 40px; }
  .topbar { align-items: center; margin-bottom: 24px; }
  .topbar .eyebrow { display: none; }
  h1 { font-size: 1.9rem; }
  .hero-grid, .stats-grid { grid-template-columns: 1fr; }
  .hero-card { min-height: 305px; }
  .goal-card { min-height: 260px; }
  .conversation-layout { grid-template-columns: 1fr; }
  .scenario-list { grid-template-columns: repeat(3,1fr); }
  .scenario-list { max-height: 290px; }
  .chat-panel { min-height: 600px; }
  .mobile-nav {
    position: fixed;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 40;
    display: grid;
    grid-template-columns: repeat(8, minmax(46px,1fr));
    padding: 6px 5px calc(6px + env(safe-area-inset-bottom));
    overflow-x: auto;
    border-top: 1px solid rgba(255,255,255,.1);
    color: rgba(255,255,255,.58);
    background: rgba(24,58,58,.97);
    backdrop-filter: blur(14px);
  }
  .mobile-nav button { display: grid; place-items: center; gap: 2px; min-width: 46px; padding: 4px 1px; border: 0; color: inherit; background: transparent; }
  .mobile-nav button span { font-family: var(--display); font-size: 1rem; }
  .mobile-nav button small { font-size: .56rem; }
  .mobile-nav button.is-active { color: var(--sun); }
  .toast-region { bottom: calc(82px + env(safe-area-inset-bottom)); }
}

@media (max-width: 590px) {
  .main-stage { padding-inline: 13px; }
  .topbar-meta { gap: 6px; }
  .streak-pill { padding: 7px 10px; }
  .hero-card { padding: 27px 23px; border-radius: 22px; }
  .hero-card h2 { font-size: 2rem; }
  .hero-card::after { font-size: 7rem; }
  .goal-card, .paper-card { border-radius: 20px; }
  .module-grid { grid-template-columns: 1fr 1fr; gap: 9px; }
  .module-card { min-height: 172px; padding: 16px; }
  .module-card h3 { margin-top: 25px; font-size: 1.15rem; }
  .module-card p { font-size: .69rem; }
  .section-head { margin-top: 34px; }
  .lesson-list, .scenario-list { grid-template-columns: 1fr; }
  .reading-card { padding-inline: 18px; }
  .sentence-head { grid-template-columns: auto 1fr; }
  .sentence-head > span:last-child { display: none; }
  .sentence-detail { padding-left: 42px; }
  .training-card { padding: 22px 17px; }
  .mode-switch { width: 100%; }
  .mode-switch button { flex: 1; }
  .action-row > button { flex: 1; }
  .chat-header { padding: 17px; }
  .chat-log { padding: 17px; }
  .message { max-width: 88%; }
  .chat-compose { padding: 14px; }
  .compose-row { grid-template-columns: auto 1fr; }
  .compose-row .primary-button { grid-column: 1 / -1; }
  .mistake-card, .data-panel { grid-template-columns: 1fr; }
  .mistake-actions { flex-direction: row; justify-content: flex-start; }
  .data-actions button { flex: 1; }
  .vocab-overview { grid-template-columns: 1fr; padding: 24px 19px; }
  .vocab-stats { grid-template-columns: repeat(2,1fr); }
  .vocab-toolbar { align-items: stretch; }
  .vocab-toolbar .mode-switch { overflow-x: auto; }
  .word-card { min-height: 510px; padding: 22px 17px; }
  .save-word-button { top: 18px; right: 18px; }
  .word-face { margin-top: 56px; }
  .word-title { font-size: 4rem; }
  .rating-grid { grid-template-columns: repeat(2,1fr); }
  .dictionary-grid { grid-template-columns: 1fr; }
  .translation-page-tabs { max-width: none; }
  .translator-head { display: block; }
  .translator-head .chip { margin-bottom: 14px; }
  .translator-actions > button { flex: 1 1 42%; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}