:root {
  --bg: #f6efe4;
  --paper: rgba(255, 252, 246, 0.9);
  --paper-strong: #fffaf2;
  --ink: #173039;
  --ink-soft: #53686d;
  --line: rgba(23, 48, 57, 0.12);
  --rail: #12333d;
  --rail-card: rgba(255, 255, 255, 0.08);
  --teal: #17816d;
  --teal-soft: rgba(23, 129, 109, 0.12);
  --coral: #d66a52;
  --coral-soft: rgba(214, 106, 82, 0.12);
  --gold: #cb9a3f;
  --gold-soft: rgba(203, 154, 63, 0.14);
  --sky: #6e9eb1;
  --lavender: #cdbfd9;
  --shadow: 0 20px 60px rgba(26, 45, 50, 0.12);
  --shadow-soft: 0 10px 30px rgba(26, 45, 50, 0.08);
  --radius-xl: 30px;
  --radius-lg: 24px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --unit-1: #d66a52;
  --unit-2: #cb9a3f;
  --unit-3: #17816d;
  --unit-4: #6e9eb1;
  --unit-5: #b86f82;
  --unit-6: #6676bf;
  --unit-7: #8d6c3f;
  --unit-8: #718d4f;
  --unit-9: #c15d3e;
  --unit-10: #4f7ca8;
  --unit-11: #9b6b54;
  --unit-12: #6a8e6a;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  color: var(--ink);
  font-family: "Manrope", "Noto Sans SC", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(214, 106, 82, 0.18), transparent 32%),
    radial-gradient(circle at top right, rgba(23, 129, 109, 0.14), transparent 30%),
    radial-gradient(circle at bottom left, rgba(110, 158, 177, 0.16), transparent 28%),
    linear-gradient(180deg, #f9f3e8 0%, #f1e7d8 54%, #f8f1e6 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.22) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.22) 1px, transparent 1px);
  background-size: 22px 22px;
  mask-image: linear-gradient(180deg, transparent, black 18%, black 82%, transparent);
  opacity: 0.28;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  border: 0;
  cursor: pointer;
}

img {
  display: block;
  max-width: 100%;
}

#app {
  min-height: 100vh;
}

.shell {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  min-height: 100vh;
}

.rail {
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  overflow: auto;
  padding: 24px 20px 28px;
  background:
    radial-gradient(circle at top right, rgba(203, 154, 63, 0.24), transparent 30%),
    radial-gradient(circle at bottom left, rgba(214, 106, 82, 0.16), transparent 34%),
    linear-gradient(180deg, #0f2b33 0%, #173a44 100%);
  color: #f6f5f0;
  border-right: 1px solid rgba(255, 255, 255, 0.08);
}

.rail-inner {
  display: grid;
  gap: 18px;
}

.brand {
  padding: 16px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.12), rgba(255, 255, 255, 0.03));
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.brand-top {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  width: 48px;
  height: 48px;
  border-radius: 16px;
  display: grid;
  place-items: center;
  font-family: "Fraunces", serif;
  font-size: 20px;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, var(--coral), var(--gold));
  box-shadow: 0 14px 30px rgba(214, 106, 82, 0.24);
}

.brand-title {
  font-family: "Fraunces", "Noto Sans SC", serif;
  font-size: 21px;
  line-height: 1.05;
}

.brand-sub {
  margin-top: 2px;
  font-size: 12px;
  color: rgba(246, 245, 240, 0.68);
}

.brand-note {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.65;
  color: rgba(246, 245, 240, 0.8);
}

.rail-home {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 14px;
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  font-weight: 700;
  transition: transform 0.18s ease, background 0.18s ease;
}

.rail-home:hover {
  transform: translateY(-1px);
  background: rgba(255, 255, 255, 0.16);
}

.rail-home.is-active {
  background: linear-gradient(135deg, rgba(214, 106, 82, 0.92), rgba(203, 154, 63, 0.86));
}

.rail-panel {
  padding: 16px;
  border-radius: var(--radius-md);
  background: var(--rail-card);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.panel-label {
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(246, 245, 240, 0.56);
}

.meter {
  margin-top: 12px;
  height: 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.1);
  overflow: hidden;
}

.meter > span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--gold), var(--coral));
}

.progress-copy {
  margin-top: 12px;
  display: grid;
  gap: 4px;
  font-size: 13px;
  color: rgba(246, 245, 240, 0.84);
}

.progress-copy strong {
  font-size: 26px;
  font-weight: 800;
}

.mini-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 14px;
}

.mini-stat {
  padding: 12px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.07);
}

.mini-stat b {
  display: block;
  font-size: 18px;
}

.mini-stat span {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  color: rgba(246, 245, 240, 0.64);
}

.save-panel {
  display: grid;
  gap: 8px;
}

.save-status {
  font-size: 13px;
  font-weight: 800;
  color: #a9e3c1;
}

.save-status.is-bad {
  color: #ffb3a4;
}

.save-time,
.save-origin {
  font-size: 11px;
  line-height: 1.45;
  color: rgba(246, 245, 240, 0.66);
  overflow-wrap: anywhere;
}

.account-box {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 10px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.08);
}

.account-box strong {
  color: #fff;
  font-size: 14px;
}

.auth-form {
  display: grid;
  gap: 8px;
}

.auth-tabs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px;
}

.auth-tabs button {
  min-height: 30px;
  border: 0;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  color: rgba(246, 245, 240, 0.72);
  font-weight: 800;
  cursor: pointer;
}

.auth-tabs button.is-active {
  background: rgba(246, 245, 240, 0.94);
  color: var(--ink);
}

.auth-form input {
  width: 100%;
  min-height: 36px;
  padding: 0 10px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  font: inherit;
}

.auth-form input::placeholder {
  color: rgba(246, 245, 240, 0.5);
}

.auth-message {
  color: #ffccb8;
  font-size: 11px;
  line-height: 1.45;
}

.unit-stack {
  display: grid;
  gap: 14px;
}

.unit-block {
  border-radius: var(--radius-md);
  padding: 14px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.unit-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 10px;
}

.unit-head strong {
  display: block;
  font-size: 14px;
}

.unit-head span {
  display: block;
  margin-top: 2px;
  font-size: 12px;
  color: rgba(246, 245, 240, 0.64);
}

.unit-pill {
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 800;
  color: #fff;
}

.unit-pill.unit-1 {
  background: var(--unit-1);
}

.unit-pill.unit-2 {
  background: var(--unit-2);
}

.unit-pill.unit-3 {
  background: var(--unit-3);
}

.unit-pill.unit-4 {
  background: var(--unit-4);
}

.unit-pill.unit-5 {
  background: var(--unit-5);
}

.unit-pill.unit-6 {
  background: var(--unit-6);
}

.unit-pill.unit-7 {
  background: var(--unit-7);
}

.unit-pill.unit-8 {
  background: var(--unit-8);
}

.unit-pill.unit-9 {
  background: var(--unit-9);
}

.unit-pill.unit-10 {
  background: var(--unit-10);
}

.unit-pill.unit-11 {
  background: var(--unit-11);
}

.unit-pill.unit-12 {
  background: var(--unit-12);
}

.unit-pill.unit-special {
  background: linear-gradient(135deg, #2e8a7a, #d66a52);
}

.lesson-links {
  display: grid;
  gap: 8px;
}

.lesson-link {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr) 20px;
  align-items: center;
  gap: 10px;
  padding: 12px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.04);
  color: #f6f5f0;
  transition: transform 0.18s ease, background 0.18s ease;
}

.lesson-link:hover {
  transform: translateX(2px);
  background: rgba(255, 255, 255, 0.1);
}

.lesson-link.is-active {
  background: rgba(255, 255, 255, 0.18);
  outline: 1px solid rgba(255, 255, 255, 0.12);
}

.lesson-link.is-mastered {
  box-shadow: inset 0 0 0 1px rgba(203, 154, 63, 0.45);
}

.lesson-code {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 38px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.12);
  font-weight: 800;
}

.lesson-copy strong {
  display: block;
  font-size: 13px;
  line-height: 1.25;
}

.lesson-copy span {
  display: block;
  margin-top: 4px;
  font-size: 11px;
  color: rgba(246, 245, 240, 0.66);
}

.lesson-flag {
  width: 14px;
  height: 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.2);
}

.lesson-link.is-mastered .lesson-flag {
  background: linear-gradient(135deg, var(--gold), #f5d08a);
}

.lesson-link.is-active .lesson-flag {
  background: linear-gradient(135deg, #fff, rgba(255, 255, 255, 0.5));
}

.stage {
  padding: 28px 28px 56px;
}

.page {
  max-width: 1220px;
  margin: 0 auto;
  animation: page-rise 0.45s ease both;
}

.hero {
  position: relative;
  overflow: hidden;
  padding: 34px;
  border-radius: var(--radius-xl);
  background:
    radial-gradient(circle at top left, rgba(214, 106, 82, 0.18), transparent 30%),
    radial-gradient(circle at bottom right, rgba(23, 129, 109, 0.14), transparent 30%),
    linear-gradient(135deg, rgba(255, 251, 245, 0.96), rgba(245, 236, 221, 0.96));
  border: 1px solid rgba(255, 255, 255, 0.7);
  box-shadow: var(--shadow);
}

.hero::after {
  content: "";
  position: absolute;
  width: 340px;
  height: 340px;
  right: -120px;
  top: -120px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(203, 154, 63, 0.18), transparent 68%);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  color: var(--ink-soft);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(320px, 0.8fr);
  gap: 28px;
  margin-top: 20px;
}

.hero h1,
.lesson-hero h1 {
  margin: 12px 0 0;
  font-family: "Fraunces", "Noto Sans SC", serif;
  font-size: clamp(34px, 4vw, 56px);
  line-height: 0.98;
}

.hero p,
.lesson-hero p {
  margin: 16px 0 0;
  max-width: 780px;
  color: var(--ink-soft);
  line-height: 1.75;
  font-size: 15px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 999px;
  font-weight: 800;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--coral), #cb805f);
  box-shadow: 0 16px 30px rgba(214, 106, 82, 0.26);
}

.btn-secondary {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(23, 48, 57, 0.08);
}

.btn-soft {
  color: var(--teal);
  background: var(--teal-soft);
}

.btn.tiny {
  min-height: 36px;
  padding: 0 14px;
  font-size: 13px;
}

.hero-side {
  display: grid;
  gap: 14px;
}

.info-card,
.paper-card,
.metric-card,
.audio-card,
.resource-card,
.question-card,
.word-card,
.mini-card,
.note-card {
  border-radius: var(--radius-lg);
  background: var(--paper);
  border: 1px solid rgba(255, 255, 255, 0.72);
  box-shadow: var(--shadow-soft);
}

.metric-stack {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.metric-card {
  padding: 18px 18px 16px;
}

.metric-card strong {
  display: block;
  font-size: 30px;
  font-weight: 800;
}

.metric-card span {
  display: block;
  margin-top: 5px;
  font-size: 12px;
  color: var(--ink-soft);
}

.hero-note {
  padding: 18px 18px 16px;
}

.hero-note h3,
.paper-card h3,
.resource-panel h3 {
  margin: 0;
  font-family: "Fraunces", "Noto Sans SC", serif;
  font-size: 22px;
}

.hero-note ul,
.bullet-list {
  margin: 14px 0 0;
  padding-left: 18px;
  color: var(--ink-soft);
  line-height: 1.7;
}

.section-grid {
  display: grid;
  gap: 22px;
  margin-top: 24px;
}

.unit-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.unit-card {
  position: relative;
  overflow: hidden;
  padding: 24px;
  border-radius: var(--radius-xl);
  background:
    linear-gradient(150deg, rgba(255, 252, 246, 0.95), rgba(250, 243, 231, 0.96));
  border: 1px solid rgba(255, 255, 255, 0.8);
  box-shadow: var(--shadow-soft);
}

.unit-card::before {
  content: "";
  position: absolute;
  inset: auto auto -24px -24px;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  opacity: 0.12;
}

.unit-card.unit-1::before {
  background: var(--unit-1);
}

.unit-card.unit-2::before {
  background: var(--unit-2);
}

.unit-card.unit-3::before {
  background: var(--unit-3);
}

.unit-card.unit-4::before {
  background: var(--unit-4);
}

.unit-card.unit-5::before {
  background: var(--unit-5);
}

.unit-card.unit-6::before {
  background: var(--unit-6);
}

.unit-card.unit-7::before {
  background: var(--unit-7);
}

.unit-card.unit-8::before {
  background: var(--unit-8);
}

.unit-card.unit-9::before {
  background: var(--unit-9);
}

.unit-card.unit-10::before {
  background: var(--unit-10);
}

.unit-card.unit-11::before {
  background: var(--unit-11);
}

.unit-card.unit-12::before {
  background: var(--unit-12);
}

.unit-card.unit-special::before {
  background: linear-gradient(135deg, #2e8a7a, #d66a52);
}

.unit-card-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.unit-number {
  font-family: "Fraunces", serif;
  font-size: 60px;
  line-height: 0.9;
}

.unit-card.unit-1 .unit-number {
  color: var(--unit-1);
}

.unit-card.unit-2 .unit-number {
  color: var(--unit-2);
}

.unit-card.unit-3 .unit-number {
  color: var(--unit-3);
}

.unit-card.unit-4 .unit-number {
  color: var(--unit-4);
}

.unit-card.unit-5 .unit-number {
  color: var(--unit-5);
}

.unit-card.unit-6 .unit-number {
  color: var(--unit-6);
}

.unit-card.unit-7 .unit-number {
  color: var(--unit-7);
}

.unit-card.unit-8 .unit-number {
  color: var(--unit-8);
}

.unit-card.unit-9 .unit-number {
  color: var(--unit-9);
}

.unit-card.unit-10 .unit-number {
  color: var(--unit-10);
}

.unit-card.unit-11 .unit-number {
  color: var(--unit-11);
}

.unit-card.unit-12 .unit-number {
  color: var(--unit-12);
}

.unit-card.unit-special .unit-number {
  color: #2e8a7a;
}

.unit-copy h2 {
  margin: 0;
  font-family: "Fraunces", "Noto Sans SC", serif;
  font-size: 28px;
}

.unit-copy p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.chip-row,
.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.chip,
.tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 34px;
  padding: 0 14px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 800;
}

.chip {
  background: rgba(255, 255, 255, 0.76);
  border: 1px solid rgba(23, 48, 57, 0.08);
  color: var(--ink-soft);
}

.chip.teal,
.tag.teal {
  background: var(--teal-soft);
  color: var(--teal);
}

.chip.coral,
.tag.coral {
  background: var(--coral-soft);
  color: var(--coral);
}

.chip.gold,
.tag.gold {
  background: var(--gold-soft);
  color: #946816;
}

.unit-lessons {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.unit-lesson {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(23, 48, 57, 0.08);
}

.unit-lesson b {
  display: block;
  font-size: 14px;
}

.unit-lesson span {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  color: var(--ink-soft);
}

.lesson-hero {
  padding: 30px 32px;
  border-radius: var(--radius-xl);
  background:
    radial-gradient(circle at top right, rgba(255, 255, 255, 0.4), transparent 32%),
    linear-gradient(140deg, rgba(255, 253, 249, 0.96), rgba(247, 240, 229, 0.96));
  border: 1px solid rgba(255, 255, 255, 0.78);
  box-shadow: var(--shadow);
}

.lesson-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
  gap: 24px;
}

.lesson-callout {
  padding: 18px;
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(23, 48, 57, 0.08);
}

.lesson-callout h3 {
  margin: 0;
  font-family: "Fraunces", "Noto Sans SC", serif;
  font-size: 22px;
}

.lesson-callout p {
  margin: 10px 0 0;
  font-size: 14px;
}

.tab-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.tab-link {
  padding: 11px 16px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 800;
  color: var(--ink-soft);
  background: rgba(255, 255, 255, 0.62);
  border: 1px solid rgba(23, 48, 57, 0.08);
  transition: transform 0.18s ease, background 0.18s ease;
}

.tab-link:hover {
  transform: translateY(-1px);
}

.tab-link.is-active {
  color: #fff;
  background: linear-gradient(135deg, var(--teal), #2a9b86);
  box-shadow: 0 14px 24px rgba(23, 129, 109, 0.22);
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  margin-top: 18px;
}

.speech-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-width: min(100%, 360px);
  padding: 12px 14px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(23, 48, 57, 0.08);
}

.speech-toolbar-copy {
  display: grid;
  gap: 4px;
}

.speech-toolbar-copy strong {
  font-size: 13px;
}

.speech-toolbar-copy span {
  color: var(--ink-soft);
  font-size: 12px;
  line-height: 1.5;
}

.speech-rate-select {
  min-width: 136px;
  min-height: 42px;
  padding: 0 14px;
  border-radius: 14px;
  border: 1px solid rgba(23, 48, 57, 0.14);
  background: rgba(255, 255, 255, 0.88);
  color: var(--ink);
}

.subpage {
  display: grid;
  gap: 20px;
  margin-top: 22px;
}

.split-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(280px, 0.85fr);
  gap: 20px;
}

.paper-card,
.resource-panel {
  padding: 24px;
}

.paper-card p,
.resource-panel p {
  color: var(--ink-soft);
  line-height: 1.75;
}

.roadmap {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.mini-card {
  padding: 18px;
}

.mini-card strong {
  display: block;
  font-size: 16px;
}

.mini-card p {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.preview-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.preview-card {
  overflow: hidden;
  border-radius: 24px;
  background: var(--paper);
  border: 1px solid rgba(255, 255, 255, 0.72);
  box-shadow: var(--shadow-soft);
}

.preview-card img {
  width: 100%;
  background: #fff;
}

.preview-copy {
  padding: 18px 18px 20px;
}

.preview-copy h4 {
  margin: 0;
  font-size: 18px;
}

.preview-copy p {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.preview-actions,
.card-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.instruction-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.instruction-card {
  padding: 24px;
}

.instruction-list {
  display: grid;
  gap: 12px;
  margin-top: 16px;
}

.instruction-line {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 16px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(23, 48, 57, 0.08);
}

.instruction-copy {
  display: grid;
  gap: 4px;
}

.instruction-copy strong {
  font-size: 14px;
  line-height: 1.6;
}

.instruction-copy span,
.instruction-copy em {
  color: var(--ink-soft);
  font-size: 12px;
  line-height: 1.6;
}

.instruction-copy em {
  font-style: normal;
}

.snapshot {
  display: grid;
  gap: 10px;
}

.snapshot-line {
  padding: 12px 14px;
  border-radius: 16px;
  background: rgba(23, 129, 109, 0.08);
  color: var(--ink);
  font-size: 13px;
  line-height: 1.65;
}

.reading-article {
  margin-top: 20px;
}

.reading-article-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
}

.reading-article-head p {
  margin-top: 10px;
}

.reading-section-list {
  display: grid;
  gap: 16px;
  margin-top: 18px;
}

.reading-section {
  padding: 18px;
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(23, 48, 57, 0.1);
}

.reading-section-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 14px;
}

.reading-section-title {
  display: grid;
  gap: 4px;
}

.reading-section-title span {
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.reading-section-title h4 {
  margin: 0;
  font-size: 18px;
}

.reading-paragraph-list {
  display: grid;
  gap: 12px;
}

.reading-paragraph {
  padding: 14px 16px;
  border-radius: 18px;
  background: rgba(23, 129, 109, 0.06);
  border: 1px solid rgba(23, 48, 57, 0.08);
}

.reading-paragraph p {
  margin: 0 0 12px;
  line-height: 1.75;
}

.word-layout {
  display: grid;
  grid-template-columns: minmax(320px, 0.72fr) minmax(0, 1fr);
  gap: 20px;
}

.sticky-panel {
  position: sticky;
  top: 24px;
}

.vocab-meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 16px;
}

.vocab-stat {
  padding: 12px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid rgba(23, 48, 57, 0.08);
}

.vocab-stat strong {
  display: block;
  font-size: 22px;
}

.vocab-stat span {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  color: var(--ink-soft);
}

.word-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.word-card {
  padding: 20px;
}

.word-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.word-head-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  align-items: center;
  gap: 8px;
  max-width: 58%;
}

.word-head h4 {
  margin: 0;
  font-size: 22px;
}

.word-ipa {
  display: block;
  margin-top: 6px;
  color: var(--teal);
  font-size: 13px;
  font-weight: 700;
}

.word-zh {
  margin-top: 12px;
  font-size: 15px;
  font-weight: 800;
}

.word-example {
  margin-top: 12px;
  color: var(--ink-soft);
  line-height: 1.7;
  font-size: 13px;
}

.word-note {
  margin-top: 10px;
  padding: 10px 12px;
  border-radius: 14px;
  background: rgba(203, 154, 63, 0.12);
  color: #7a5716;
  font-size: 12px;
  line-height: 1.6;
}

.pronunciation-result {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  min-height: 32px;
  max-width: 100%;
  padding: 5px 8px;
  border-radius: 999px;
  background: rgba(57, 143, 123, 0.1);
  border: 1px solid rgba(57, 143, 123, 0.2);
  color: var(--ink);
  font-size: 11px;
  font-weight: 700;
  line-height: 1.35;
}

.pronunciation-result.is-preparing,
.pronunciation-result.is-listening {
  background: rgba(203, 154, 63, 0.12);
  border-color: rgba(203, 154, 63, 0.25);
}

.pronunciation-result.is-error {
  background: rgba(189, 74, 63, 0.1);
  border-color: rgba(189, 74, 63, 0.2);
}

.pronunciation-score {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  height: 22px;
  padding: 0 8px;
  border-radius: 999px;
  background: var(--teal);
  color: #fff;
  font-size: 12px;
}

.pronunciation-message,
.pronunciation-heard {
  overflow-wrap: anywhere;
}

.pronunciation-best {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 9px;
  border-radius: 999px;
  background: rgba(57, 143, 123, 0.12);
  color: var(--teal);
  font-size: 11px;
  font-weight: 800;
}

.pronunciation-heard {
  color: var(--ink-soft);
  font-weight: 700;
}

.word-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.word-bank {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.word-pill {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(23, 48, 57, 0.08);
}

.word-pill .pronunciation-result {
  margin: 0;
}

.word-pill.is-remembered {
  background: rgba(57, 143, 123, 0.12);
  border-color: rgba(57, 143, 123, 0.28);
}

.word-pill strong {
  font-size: 13px;
}

.word-pill span {
  color: var(--ink-soft);
  font-size: 12px;
}

.grammar-stack,
.list-stack,
.resource-stack,
.audio-stack,
.question-list,
.callout-stack {
  display: grid;
  gap: 16px;
}

.grammar-card {
  padding: 18px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(23, 48, 57, 0.08);
}

.grammar-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.grammar-card h4 {
  margin: 0;
  font-size: 19px;
}

.grammar-card ul {
  margin: 12px 0 0;
  padding-left: 18px;
  color: var(--ink-soft);
  line-height: 1.7;
}

.grammar-example {
  margin-top: 12px;
  padding: 12px 14px;
  border-radius: 16px;
  background: var(--teal-soft);
  color: var(--teal);
  font-weight: 700;
}

.grammar-html {
  padding: 18px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(23, 48, 57, 0.08);
}

.grammar-html p,
.grammar-html li,
.grammar-html td,
.grammar-html th {
  line-height: 1.7;
  color: var(--ink-soft);
}

.grammar-html table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 12px;
}

.grammar-html th,
.grammar-html td {
  padding: 10px 12px;
  border: 1px solid rgba(23, 48, 57, 0.1);
  text-align: left;
  font-size: 13px;
}

.audio-grid,
.resource-grid,
.info-grid,
.support-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.audio-card,
.resource-card,
.note-card {
  padding: 18px;
}

.audio-card h4,
.resource-card h4,
.note-card h4 {
  margin: 0;
  font-size: 18px;
}

.audio-card p,
.resource-card p,
.note-card p {
  margin: 10px 0 0;
  color: var(--ink-soft);
  line-height: 1.7;
  font-size: 13px;
}

.audio-list {
  display: grid;
  gap: 12px;
  margin-top: 16px;
}

.audio-item {
  padding: 12px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(23, 48, 57, 0.08);
}

.audio-item strong {
  display: block;
  margin-bottom: 8px;
  font-size: 13px;
}

.resource-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.audio-position {
  display: inline-flex;
  align-items: center;
  padding: 5px 10px;
  border-radius: 999px;
  background: rgba(23, 129, 109, 0.1);
  color: var(--teal);
  font-size: 11px;
  font-weight: 800;
}

.audio-usage {
  margin-top: 8px;
  color: var(--ink-soft);
  line-height: 1.6;
  font-size: 12px;
}

.audio-actions {
  margin-top: 10px;
  margin-bottom: 10px;
}

.audio-script {
  margin-top: 10px;
  margin-bottom: 10px;
  padding: 12px;
  border-radius: 14px;
  background: rgba(23, 129, 109, 0.08);
  border: 1px solid rgba(23, 129, 109, 0.14);
}

.audio-script-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}

.audio-script-top span {
  color: var(--teal);
  font-size: 12px;
  font-weight: 800;
}

.audio-script-text {
  color: var(--ink);
  line-height: 1.7;
  font-size: 13px;
}

.audio-item audio {
  width: 100%;
}

.support-card {
  overflow: hidden;
  border-radius: 22px;
  background: var(--paper);
  border: 1px solid rgba(255, 255, 255, 0.72);
  box-shadow: var(--shadow-soft);
}

.support-card img {
  width: 100%;
  max-height: 260px;
  object-fit: cover;
  background: #fff;
}

.support-copy {
  padding: 18px;
}

.support-copy h4 {
  margin: 0;
  font-size: 18px;
}

.support-copy span {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  color: var(--ink-soft);
}

.practice-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 14px;
}

.practice-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: 999px;
  background: var(--gold-soft);
  color: #8a631b;
  font-size: 12px;
  font-weight: 800;
}

.question-card {
  padding: 22px;
}

.question-card.correct {
  outline: 2px solid rgba(23, 129, 109, 0.28);
}

.question-card.wrong {
  outline: 2px solid rgba(214, 106, 82, 0.3);
}

.question-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 34px;
  height: 34px;
  padding: 0 10px;
  border-radius: 999px;
  background: var(--teal-soft);
  color: var(--teal);
  font-size: 13px;
  font-weight: 800;
}

.question-card h4 {
  margin: 14px 0 0;
  font-size: 18px;
  line-height: 1.5;
}

.choice-list,
.match-list {
  display: grid;
  gap: 10px;
  margin-top: 16px;
}

.choice-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 14px 16px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.74);
  border: 1px solid rgba(23, 48, 57, 0.08);
}

.choice-item input,
.match-row select {
  margin-top: 2px;
}

.choice-item.is-correct-answer {
  background: rgba(23, 129, 109, 0.1);
}

.choice-item.is-wrong-answer {
  background: rgba(214, 106, 82, 0.1);
}

.answer-input,
.order-input,
.match-row select {
  width: 100%;
  min-height: 48px;
  margin-top: 16px;
  padding: 0 16px;
  border-radius: 16px;
  border: 1px solid rgba(23, 48, 57, 0.14);
  background: rgba(255, 255, 255, 0.82);
  color: var(--ink);
}

.scramble {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px;
}

.scramble span {
  padding: 10px 12px;
  border-radius: 14px;
  background: rgba(23, 129, 109, 0.08);
  color: var(--teal);
  font-size: 13px;
  font-weight: 700;
}

.match-row {
  display: grid;
  grid-template-columns: minmax(130px, 0.7fr) minmax(0, 1fr);
  gap: 12px;
  align-items: center;
}

.feedback {
  margin-top: 16px;
  padding: 12px 14px;
  border-radius: 16px;
  font-size: 13px;
  line-height: 1.7;
}

.feedback.good {
  background: rgba(23, 129, 109, 0.12);
  color: var(--teal);
}

.feedback.bad {
  background: rgba(214, 106, 82, 0.12);
  color: #a14a37;
}

.empty-state {
  padding: 28px;
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.68);
  border: 1px dashed rgba(23, 48, 57, 0.16);
  color: var(--ink-soft);
  line-height: 1.8;
}

.footer-note {
  margin-top: 24px;
  padding: 18px 20px;
  border-radius: 24px;
  background: rgba(18, 51, 61, 0.92);
  color: rgba(255, 250, 242, 0.84);
}

.footer-note strong {
  color: #fff;
}

@keyframes page-rise {
  from {
    opacity: 0;
    transform: translateY(12px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 1180px) {
  .shell {
    grid-template-columns: 1fr;
  }

  .rail {
    position: relative;
    height: auto;
  }

  .hero-grid,
  .lesson-hero-grid,
  .split-grid,
  .word-layout {
    grid-template-columns: 1fr;
  }

  .sticky-panel {
    position: static;
  }

  .stage {
    padding-top: 18px;
  }
}

@media (max-width: 900px) {
  .unit-grid,
  .preview-grid,
  .instruction-grid,
  .word-grid,
  .audio-grid,
  .resource-grid,
  .support-grid,
  .info-grid {
    grid-template-columns: 1fr;
  }

  .roadmap,
  .metric-stack,
  .vocab-meta {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .rail,
  .stage {
    padding-left: 14px;
    padding-right: 14px;
  }

  .hero,
  .lesson-hero,
  .paper-card,
  .resource-panel {
    padding: 22px;
  }

  .roadmap,
  .metric-stack,
  .vocab-meta {
    grid-template-columns: 1fr;
  }

  .lesson-link {
    grid-template-columns: 44px minmax(0, 1fr) 16px;
    padding: 10px;
  }

  .word-head {
    display: grid;
  }

  .word-head-actions {
    justify-content: flex-start;
    max-width: 100%;
  }

  .lesson-code {
    width: 44px;
  }

  .hero h1,
  .lesson-hero h1 {
    font-size: 34px;
  }

  .speech-toolbar,
  .speech-rate-select {
    width: 100%;
  }

  .match-row {
    grid-template-columns: 1fr;
  }
}