:root {
  --ink: #20313f;
  --muted: #66717c;
  --line: #d8e0e6;
  --soft-line: #e9eef2;
  --paper: #f4f6f4;
  --panel: #ffffff;
  --wash: #e8f3f4;
  --navy: #244f6b;
  --teal: #137c78;
  --teal-dark: #0f5f5c;
  --coral: #c85f55;
  --gold: #c9953c;
  --green: #527f5d;
  --shadow: 0 18px 45px rgba(32, 49, 63, 0.09);
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  line-height: 1.5;
}

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

button,
a {
  -webkit-tap-highlight-color: transparent;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  min-height: 68px;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 10px clamp(16px, 4vw, 44px);
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

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

.brand-mark {
  display: inline-grid;
  width: 42px;
  height: 42px;
  place-items: center;
  color: #fff;
  background: var(--teal);
  border-radius: 8px;
  font-weight: 800;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-size: 18px;
}

.brand small {
  color: var(--muted);
  font-size: 13px;
}

.top-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.top-nav a,
.top-nav button,
.button {
  min-height: 40px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 9px 13px;
  background: #fff;
  color: var(--ink);
  cursor: pointer;
}

.button.primary,
.top-nav a:hover,
.top-nav button:hover {
  border-color: var(--teal);
}

.button.primary {
  background: var(--teal);
  color: #fff;
}

.button.primary:hover {
  background: var(--teal-dark);
}

.button.ghost {
  background: transparent;
}

.button.full {
  width: 100%;
}

.home-shell,
.lesson-shell,
.student-home-shell {
  width: min(100%, 1400px);
  margin: 0 auto;
  padding: 24px clamp(14px, 3vw, 32px) 42px;
}

.course-hero,
.student-start {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 1.1fr);
  gap: 34px;
  align-items: center;
  min-height: calc(100vh - 210px);
}

.course-hero h1,
.student-start h1,
.lesson-topline h1 {
  margin: 0;
  color: var(--navy);
  font-size: clamp(38px, 7vw, 84px);
  line-height: 0.98;
  letter-spacing: 0;
}

.course-hero img,
.student-start img {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--coral);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero-copy {
  max-width: 620px;
  color: var(--muted);
  font-size: 20px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.big-action {
  min-height: 54px;
  padding: 14px 20px;
  font-size: 18px;
  font-weight: 800;
}

.status-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 10px;
}

.status-card,
.resume-card,
.video-card,
.checkpoint-card,
.task-column,
.student-task-shell,
.task-card,
.picture-card,
.instruction-panel,
.ai-warmup-panel,
.recommend-panel,
.next-task-card,
.extension-card,
.extension-route,
.feedback-panel,
.completion-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.status-card {
  padding: 18px;
}

.status-label,
.resume-card span {
  display: block;
  color: var(--muted);
  font-size: 13px;
}

.status-card strong,
.resume-card strong {
  display: block;
  margin-top: 2px;
  font-size: 20px;
}

.resume-card small {
  display: block;
  margin-top: 6px;
  color: var(--muted);
  font-size: 12px;
}

.status-card p {
  margin: 8px 0 0;
  color: var(--muted);
}

.lesson-topline {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 18px;
}

.lesson-topline h1 {
  max-width: 880px;
  font-size: clamp(32px, 5vw, 58px);
}

.resume-card {
  min-width: 190px;
  padding: 14px 16px;
}

.lesson-progress {
  position: sticky;
  top: 69px;
  z-index: 18;
  padding: 12px 0 16px;
  background: var(--paper);
}

.progress-track {
  position: relative;
  height: 8px;
  overflow: hidden;
  border-radius: 999px;
  background: var(--soft-line);
}

.progress-track span {
  display: block;
  width: 0;
  height: 100%;
  background: var(--teal);
  transition: width 180ms ease;
}

.progress-steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  margin: 10px 0 0;
  padding: 0;
  list-style: none;
}

.progress-steps li {
  color: var(--muted);
  font-size: 14px;
  font-weight: 800;
  text-align: center;
}

.progress-steps li.active {
  color: var(--teal);
}

.lesson-layout {
  display: grid;
  grid-template-columns: minmax(320px, 0.82fr) minmax(0, 1.18fr);
  gap: 18px;
  align-items: start;
}

.media-column {
  position: sticky;
  top: 134px;
  display: grid;
  gap: 14px;
}

.video-card {
  padding: 12px;
}

video {
  display: block;
  width: 100%;
  max-height: min(46vh, 430px);
  background: #101820;
  border-radius: 6px;
  aspect-ratio: 16 / 9;
}

.video-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
  color: var(--muted);
  font-size: 14px;
}

.video-meta span,
.save-state,
.mini-button {
  border: 1px solid var(--soft-line);
  border-radius: 8px;
  padding: 5px 8px;
  background: #fbfcfd;
}

.youtube-note {
  margin-top: 10px;
  border: 1px dashed var(--line);
  border-radius: 8px;
  padding: 10px;
  background: #f7fafb;
}

.youtube-note strong {
  color: var(--navy);
}

.youtube-note p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.checkpoint-card {
  padding: 16px;
}

.checkpoint-card h2,
.task-header h2,
.answer-panel h3,
.word-bank-title h3,
.instruction-panel h3,
.panel-heading h3,
.next-task-card h4 {
  margin: 0;
}

.checkpoint-card h2 {
  margin-bottom: 10px;
  color: var(--navy);
  font-size: 20px;
}

.check-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 9px 0;
  border-top: 1px solid var(--soft-line);
}

.check-row span {
  color: var(--muted);
}

.checkpoint-card .button {
  margin-top: 12px;
}

.task-column,
.student-task-shell {
  padding: clamp(14px, 2vw, 22px);
}

.student-task-shell {
  scroll-margin-top: 116px;
}

.task-header {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
}

.task-header h2 {
  color: var(--coral);
  font-size: clamp(26px, 3vw, 38px);
  line-height: 1.05;
}

.save-state {
  flex: 0 0 auto;
  color: var(--green);
  font-size: 13px;
  font-weight: 700;
}

.instruction-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 16px;
  align-items: center;
  margin-bottom: 16px;
  padding: 16px;
  background: #fffdf8;
  border-color: #ead8b5;
}

.task-card {
  display: none;
  padding: clamp(14px, 2vw, 22px);
}

.task-card.active {
  display: block;
}

.completion-panel {
  display: none;
  margin-top: 16px;
  padding: 18px;
  background: #f7fbfa;
}

.completion-panel.active {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.completion-panel h3 {
  margin: 0;
  color: var(--navy);
  font-size: 24px;
}

.completion-panel p:not(.eyebrow) {
  margin: 8px 0 0;
  color: var(--muted);
}

.completion-actions {
  display: flex;
  flex: 0 0 auto;
  flex-wrap: wrap;
  gap: 10px;
}

.warmup-layout {
  display: grid;
  grid-template-columns: minmax(320px, 0.95fr) minmax(0, 1.05fr);
  gap: 18px;
  align-items: start;
}

.picture-card {
  margin: 0;
  overflow: hidden;
}

.picture-card img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.listen-workspace {
  display: grid;
  grid-template-columns: minmax(320px, 0.88fr) minmax(0, 1.12fr);
  gap: 18px;
  align-items: start;
}

.listening-work {
  display: grid;
  gap: 14px;
}

.task-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 16px;
}

.instruction-panel h3,
.panel-heading h3 {
  color: var(--navy);
  font-size: 22px;
}

.instruction-panel p,
.recommend-copy {
  margin: 8px 0 0;
  color: var(--muted);
}

.ai-warmup-panel,
.recommend-panel {
  margin-bottom: 16px;
  padding: 16px;
}

.task-card .ai-warmup-panel {
  margin-bottom: 0;
}

.panel-heading {
  margin-bottom: 10px;
}

.chat-thread {
  display: grid;
  gap: 10px;
}

.chat-bubble {
  display: grid;
  gap: 6px;
  max-width: 88%;
  padding: 12px;
  border-radius: 8px;
}

.chat-bubble span,
.next-task-card > span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.chat-bubble p {
  margin: 0;
}

.chat-bubble.ai {
  background: var(--wash);
}

.chat-bubble.learner {
  justify-self: end;
  width: min(88%, 620px);
  background: #f7fafb;
  border: 1px solid var(--soft-line);
}

.feedback-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-top: 12px;
  padding: 12px;
  background: #fffdf8;
  border-color: #ead8b5;
}

.feedback-panel p {
  margin: 4px 0 0;
  color: var(--muted);
}

.coach-feedback-list {
  display: grid;
  gap: 8px;
  margin-top: 10px;
}

.coach-feedback-row {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  border: 1px solid var(--soft-line);
  border-radius: 8px;
  padding: 9px 10px;
  background: #fff;
}

.coach-feedback-row strong {
  color: var(--teal);
  font-size: 13px;
}

.coach-feedback-row span {
  color: var(--ink);
}

.feedback-label {
  color: var(--coral);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.support-bridge,
.listening-support-panel {
  margin-top: 12px;
  border: 1px solid var(--soft-line);
  border-radius: 8px;
  padding: 12px;
  background: #f7fafb;
}

.support-bridge {
  display: grid;
  gap: 7px;
}

.support-bridge div {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: baseline;
}

.support-bridge span,
.support-pill,
.support-card > span {
  color: var(--teal);
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
}

.support-bridge strong {
  color: var(--navy);
}

.support-bridge p,
.listening-support-panel p {
  margin: 0;
  color: var(--muted);
}

.support-pill {
  border: 1px solid var(--soft-line);
  border-radius: 8px;
  padding: 5px 8px;
  background: #fff;
}

.support-card-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin-top: 12px;
}

.support-card {
  display: grid;
  gap: 8px;
  border: 1px solid var(--soft-line);
  border-radius: 8px;
  padding: 12px;
  background: #fff;
  opacity: 1;
}

.support-card.active {
  border-color: var(--teal);
  box-shadow: 0 0 0 3px rgba(19, 124, 120, 0.1);
  opacity: 1;
}

.support-card[hidden],
.word-bank-panel[hidden] {
  display: none;
}

.support-card h4 {
  margin: 0;
  color: var(--navy);
  font-size: 16px;
}

.support-card label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.compact-traffic button {
  min-height: 34px;
  padding: 6px 9px;
  font-size: 14px;
}

.category-cues {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
}

.category-cues strong,
.frame-line {
  border: 1px solid var(--soft-line);
  border-radius: 8px;
  padding: 8px;
  background: #fffdf8;
  color: var(--navy);
  text-align: center;
}

.listening-feedback {
  margin-top: 0;
}

.compact-feedback {
  align-items: stretch;
  flex-direction: column;
}

.next-task-card.locked {
  background: #f7fafb;
  opacity: 0.45;
}

.next-task-card.locked textarea,
.next-task-card.locked button {
  pointer-events: none;
}

.word-bank-panel {
  position: static;
  top: auto;
  z-index: 10;
  margin: 0;
  padding: 12px;
  background: rgba(255, 255, 255, 0.96);
  border: 1px solid var(--soft-line);
  border-radius: 8px;
  backdrop-filter: blur(10px);
}

.word-bank-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.word-bank-hint {
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.word-bank-instruction,
.record-help {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 14px;
}

.mini-button {
  color: var(--teal);
  cursor: pointer;
}

.word-bank {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.word-bank button {
  min-height: 39px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 7px 11px;
  background: #fff;
  color: var(--teal);
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
}

.word-bank button.selected {
  border-color: var(--gold);
  background: #fff7e7;
  color: #805a16;
}

.selected-keywords {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  gap: 10px;
  align-items: center;
  margin-top: 10px;
}

.selected-keywords span,
.next-task-card > span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

input,
textarea,
select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 10px 11px;
  background: #fff;
  color: var(--ink);
  outline: none;
}

input:focus,
textarea:focus,
select:focus {
  border-color: var(--teal);
  box-shadow: 0 0 0 3px rgba(19, 124, 120, 0.12);
}

select {
  min-height: 43px;
}

.answer-panel {
  margin-top: 10px;
}

.answer-panel h3 {
  margin-bottom: 8px;
  color: var(--navy);
  font-size: 21px;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
}

table {
  width: 100%;
  min-width: 650px;
  border-collapse: collapse;
}

th,
td {
  border-bottom: 1px solid var(--line);
  border-right: 1px solid var(--line);
  padding: 10px;
  vertical-align: middle;
}

thead th {
  background: var(--navy);
  color: #fff;
  text-align: left;
  font-size: 14px;
}

tbody th {
  width: 88px;
  background: #f7fafb;
  color: var(--ink);
  text-align: left;
}

td:last-child,
th:last-child {
  border-right: 0;
}

tbody tr:last-child th,
tbody tr:last-child td {
  border-bottom: 0;
}

td input {
  min-width: 145px;
  border-color: transparent;
  border-bottom-color: var(--line);
  border-radius: 0;
  font-size: 17px;
}

.next-task-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 14px 0;
}

.retry-listening-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  margin: 12px 0;
  border: 1px solid #ead8b5;
  border-radius: 8px;
  padding: 14px;
  background: #fffdf8;
}

.retry-listening-panel h4 {
  margin: 0;
  color: var(--navy);
  font-size: 18px;
}

.retry-listening-panel p:not(.eyebrow) {
  margin: 6px 0 0;
  color: var(--muted);
}

.compact-retry {
  grid-template-columns: 1fr;
  margin: 4px 0 8px;
  padding: 12px;
}

.compact-retry h4 {
  font-size: 16px;
}

.replay-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.next-task-card {
  padding: 14px;
  opacity: 0.72;
}

.next-task-card[hidden] {
  display: none;
}

.next-task-card.active {
  border-color: var(--teal);
  box-shadow: 0 0 0 3px rgba(19, 124, 120, 0.1);
  opacity: 1;
}

.next-task-card h4 {
  margin-top: 3px;
  color: var(--navy);
  font-size: 18px;
}

.next-task-card p {
  margin: 8px 0 0;
  color: var(--muted);
}

.next-task-card label {
  display: grid;
  gap: 6px;
  margin-top: 9px;
  color: var(--muted);
  font-size: 14px;
}

.dialogue-match-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 9px;
  margin-top: 10px;
}

.extension-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(220px, 0.28fr);
  gap: 16px;
  align-items: stretch;
  margin-bottom: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--soft-line);
}

.extension-hero h3 {
  margin: 0;
  color: var(--navy);
  font-size: clamp(24px, 3vw, 36px);
  line-height: 1.12;
}

.extension-hero p:not(.eyebrow) {
  max-width: 760px;
  margin: 10px 0 0;
  color: var(--muted);
}

.extension-route {
  display: grid;
  align-content: center;
  gap: 4px;
  padding: 14px;
  background: #f7fbfa;
}

.extension-route span,
.extension-card > span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.extension-route strong {
  color: var(--teal);
  font-size: 19px;
}

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

.extension-insight article,
.extension-mission article,
.sel-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.extension-insight article {
  padding: 14px;
  background: #f7fbfa;
}

.extension-insight span,
.extension-mission span {
  display: block;
  color: var(--coral);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.extension-insight p,
.extension-mission p {
  margin: 6px 0 0;
  color: var(--muted);
}

.extension-instruction,
.discussion-panel,
.ai-coach-panel {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(260px, 0.5fr);
  gap: 16px;
  margin: 16px 0;
  padding: 16px;
  border: 1px solid #ead8b5;
  border-radius: 8px;
  background: #fffdf8;
}

.extension-instruction h3,
.discussion-panel h3,
.ai-coach-panel h3 {
  margin: 0;
  color: var(--navy);
  font-size: 22px;
}

.extension-instruction p:not(.eyebrow),
.discussion-panel p:not(.eyebrow),
.ai-coach-panel p:not(.eyebrow) {
  margin: 8px 0 0;
  color: var(--muted);
}

.extension-instruction ol,
.discussion-panel ol {
  margin: 0;
  padding-left: 22px;
  color: var(--ink);
  font-weight: 700;
}

.extension-instruction li + li,
.discussion-panel li + li {
  margin-top: 8px;
}

.ai-coach-panel {
  grid-template-columns: minmax(260px, 0.7fr) minmax(280px, 1fr);
  background: #f7fbfa;
  border-color: var(--line);
}

.ai-coach-panel label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.ai-coach-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  grid-column: 2;
}

.ai-coach-output {
  grid-column: 2;
  border: 1px solid var(--soft-line);
  border-radius: 8px;
  padding: 12px;
  background: #fff;
}

.ai-coach-output span {
  display: block;
  color: var(--coral);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.ai-coach-output p {
  margin: 5px 0 0;
  color: var(--ink);
}

.extension-flow {
  display: grid;
  grid-template-columns: repeat(4, minmax(220px, 1fr));
  gap: 12px;
  align-items: start;
}

.extension-card {
  display: grid;
  gap: 10px;
  padding: 14px;
  opacity: 0.66;
}

.extension-card.active {
  border-color: var(--teal);
  box-shadow: 0 0 0 3px rgba(19, 124, 120, 0.1);
  opacity: 1;
}

.extension-card:not(.active) input,
.extension-card:not(.active) textarea,
.extension-card:not(.active) select {
  background: #fbfcfd;
}

.support-status {
  justify-self: start;
  border: 1px solid var(--soft-line);
  border-radius: 8px;
  padding: 4px 8px;
  background: #f7fafb;
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
}

.extension-card.active .support-status {
  border-color: var(--teal);
  background: #eef7ef;
  color: var(--teal);
}

.extension-card h4 {
  margin: 0;
  color: var(--navy);
  font-size: 19px;
}

.extension-card p {
  margin: 0;
  color: var(--muted);
}

.extension-card label,
.sort-board,
.sentence-builder {
  display: grid;
  gap: 7px;
}

.extension-card label {
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.sort-board,
.sentence-builder {
  grid-template-columns: 1fr;
}

.traffic-words {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.traffic-words button {
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 7px 10px;
  background: #fff;
  color: var(--teal);
  font-weight: 800;
  cursor: pointer;
}

.traffic-words button.heard {
  border-color: var(--green);
  background: #eef7ef;
  color: var(--green);
}

.current-word {
  border: 1px solid var(--soft-line);
  border-radius: 8px;
  padding: 9px 10px;
  background: #f7fafb;
  color: var(--navy);
  font-weight: 800;
}

.travel-card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.mini-travel-card {
  display: grid;
  gap: 7px;
  padding: 10px;
  border: 1px solid var(--soft-line);
  border-radius: 8px;
  background: #f7fafb;
}

.mini-travel-card strong {
  color: var(--navy);
}

.record-panel {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.record-panel span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.extension-mission {
  margin-top: 18px;
}

.extension-mission article {
  padding: 14px;
}

.extension-mission h4 {
  margin: 4px 0 10px;
  color: var(--navy);
  font-size: 18px;
}

.sel-panel {
  display: grid;
  grid-template-columns: minmax(220px, 0.36fr) minmax(0, 1fr);
  gap: 18px;
  margin-top: 16px;
  padding: 16px;
  background: #fffdf8;
  border-color: #ead8b5;
}

.sel-panel h3 {
  margin: 0;
  color: var(--navy);
  font-size: 22px;
}

.sel-panel p {
  margin: 8px 0 0;
  color: var(--muted);
}

.sel-meaning {
  display: grid;
  gap: 7px;
  margin-top: 12px;
}

.sel-meaning p {
  margin: 0;
  border: 1px solid var(--soft-line);
  border-radius: 8px;
  padding: 9px 10px;
  background: #fff;
}

.sel-task-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.sel-task-grid label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.path-shell {
  display: grid;
  gap: 18px;
}

.path-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.34fr);
  gap: 18px;
  align-items: stretch;
}

.path-hero h1 {
  margin: 0;
  color: var(--navy);
  font-size: clamp(34px, 5vw, 62px);
  line-height: 1;
  letter-spacing: 0;
}

.path-copy {
  max-width: 900px;
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 19px;
}

.playlist-hero .path-copy {
  max-width: 980px;
}

.path-status-panel,
.path-legend,
.path-column,
.fast-finisher-panel,
.path-task,
.bridge-step,
.finisher-grid article,
.pacing-card,
.teacher-control-panel,
.playlist-metric,
.playlist-board,
.task-library-panel,
.playlist-period,
.library-column {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.path-status-panel {
  display: grid;
  align-content: center;
  gap: 6px;
  padding: 18px;
  background: #f7fbfa;
}

.path-status-panel span,
.task-number,
.bridge-step span,
.finisher-grid span {
  color: var(--coral);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.path-status-panel strong {
  color: var(--teal);
  font-size: 24px;
}

.path-status-panel p {
  margin: 0;
  color: var(--muted);
}

.path-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 12px;
  background: #fffdf8;
  border-color: #ead8b5;
}

.path-legend span {
  border: 1px solid var(--soft-line);
  border-radius: 8px;
  padding: 7px 9px;
  background: #fff;
  color: var(--muted);
  font-size: 13px;
}

.path-legend strong {
  color: var(--ink);
}

.teacher-control-panel {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr)) minmax(220px, 0.8fr);
  gap: 12px;
  padding: 14px;
  background: #f7fbfa;
}

.playlist-metric {
  display: grid;
  gap: 4px;
  padding: 14px;
}

.playlist-metric span,
.playlist-actions span {
  color: var(--coral);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.playlist-metric strong {
  color: var(--navy);
  font-size: 28px;
  line-height: 1;
}

.playlist-metric p {
  margin: 0;
  color: var(--muted);
}

.playlist-actions {
  display: grid;
  align-content: center;
  gap: 10px;
}

.pacing-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.pacing-card {
  display: grid;
  gap: 5px;
  padding: 16px;
  background: #f7fbfa;
}

.pacing-card span,
.period-heading span,
.library-column > span {
  color: var(--coral);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.pacing-card strong {
  color: var(--teal);
  font-size: 30px;
  line-height: 1;
}

.pacing-card p {
  margin: 0;
  color: var(--muted);
}

.playlist-board,
.task-library-panel {
  display: grid;
  gap: 14px;
  padding: 16px;
}

.section-heading h2 {
  margin: 0;
  color: var(--navy);
  font-size: 30px;
  line-height: 1.12;
}

.section-heading p:not(.eyebrow) {
  max-width: 980px;
  margin: 8px 0 0;
  color: var(--muted);
}

.playlist-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.playlist-period {
  display: grid;
  gap: 12px;
  align-content: start;
  padding: 14px;
}

.prep-period {
  grid-column: 1 / -1;
  background: #fffdf8;
  border-color: #ead8b5;
}

.playlist-period.status-assigned {
  border-color: rgba(201, 149, 60, 0.58);
  box-shadow: 0 0 0 3px rgba(201, 149, 60, 0.08);
}

.playlist-period.status-done {
  border-color: rgba(19, 124, 120, 0.5);
  background: #f7fbfa;
  box-shadow: 0 0 0 3px rgba(19, 124, 120, 0.08);
}

.period-planner {
  display: grid;
  gap: 10px;
  border-top: 1px solid var(--soft-line);
  padding-top: 10px;
}

.period-status-control {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.period-status-control button {
  min-height: 36px;
  border: 0;
  border-right: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-weight: 800;
}

.period-status-control button:last-child {
  border-right: 0;
}

.period-status-control button.active {
  background: var(--teal);
  color: #fff;
}

.period-flags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.period-flags label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--soft-line);
  border-radius: 8px;
  padding: 6px 8px;
  background: #fff;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.period-flags input {
  width: 16px;
  height: 16px;
  accent-color: var(--teal);
}

.period-heading h3,
.library-column h3 {
  margin: 3px 0 0;
  color: var(--navy);
  font-size: 20px;
}

.period-heading p,
.library-column p {
  margin: 6px 0 0;
  color: var(--muted);
}

.period-blocks {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.period-blocks li {
  display: grid;
  grid-template-columns: minmax(62px, 82px) minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  border-top: 1px solid var(--soft-line);
  padding-top: 8px;
}

.period-blocks b {
  color: var(--teal);
  font-size: 13px;
}

.period-blocks span {
  color: var(--ink);
  font-size: 14px;
}

.library-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.library-column {
  display: grid;
  gap: 10px;
  align-content: start;
  padding: 14px;
}

.path-board {
  display: grid;
  grid-template-columns: minmax(280px, 1fr) minmax(260px, 0.82fr) minmax(280px, 1fr);
  gap: 14px;
  align-items: start;
}

.path-column {
  display: grid;
  gap: 12px;
  padding: 16px;
}

.path-column-heading h2,
.fast-finisher-panel h2 {
  margin: 0;
  color: var(--navy);
  font-size: 27px;
}

.path-column-heading p:not(.eyebrow),
.fast-finisher-panel p {
  margin: 8px 0 0;
  color: var(--muted);
}

.path-task-list,
.bridge-flow {
  display: grid;
  gap: 10px;
}

.path-task {
  display: grid;
  gap: 10px;
  padding: 13px;
}

.path-task.ready {
  border-color: rgba(19, 124, 120, 0.42);
  box-shadow: 0 0 0 3px rgba(19, 124, 120, 0.06);
}

.path-task.soon,
.bridge-step.soon {
  background: #fbfcfd;
}

.path-task h3,
.bridge-step h3,
.finisher-grid h3 {
  margin: 3px 0 0;
  color: var(--navy);
  font-size: 18px;
}

.path-task p,
.bridge-step p,
.finisher-grid p {
  margin: 6px 0 0;
  color: var(--muted);
}

.path-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.path-tags span,
.finisher-grid strong {
  border: 1px solid var(--soft-line);
  border-radius: 8px;
  padding: 4px 7px;
  background: #f7fafb;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.path-task.ready .path-tags span:first-child {
  border-color: rgba(19, 124, 120, 0.35);
  background: #eef7ef;
  color: var(--teal);
}

.path-task > .mini-button {
  justify-self: start;
}

.bridge-step {
  display: grid;
  gap: 8px;
  padding: 13px;
}

.fast-finisher-panel {
  display: grid;
  grid-template-columns: minmax(240px, 0.3fr) minmax(0, 1fr);
  gap: 16px;
  padding: 16px;
}

.finisher-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.finisher-grid article {
  display: grid;
  align-content: start;
  gap: 8px;
  padding: 13px;
}

.finisher-grid strong {
  justify-self: start;
}

@media (max-width: 980px) {
  .course-hero,
  .student-start,
  .lesson-layout,
  .status-grid,
  .warmup-layout,
  .listen-workspace,
  .extension-hero {
    grid-template-columns: 1fr;
  }

  .extension-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .support-card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .dialogue-match-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .pacing-grid,
  .teacher-control-panel,
  .playlist-grid,
  .library-grid {
    grid-template-columns: 1fr;
  }

  .extension-insight,
  .extension-mission,
  .extension-instruction,
  .discussion-panel,
  .ai-coach-panel,
  .sel-panel,
  .path-hero,
  .path-board,
  .fast-finisher-panel {
    grid-template-columns: 1fr;
  }

  .finisher-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .ai-coach-actions,
  .ai-coach-output {
    grid-column: auto;
  }

  .course-hero,
  .student-start {
    min-height: auto;
  }

  .lesson-topline {
    align-items: stretch;
    flex-direction: column;
  }

  .media-column {
    position: static;
  }

  video {
    max-height: none;
  }

  .instruction-panel {
    grid-template-columns: 1fr;
  }

  .completion-panel,
  .feedback-panel {
    align-items: stretch;
    flex-direction: column;
  }
}

@media (max-width: 660px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .top-nav {
    width: 100%;
    overflow-x: auto;
  }

  .course-hero h1,
  .student-start h1,
  .lesson-topline h1 {
    font-size: 38px;
  }

  .lesson-progress {
    position: static;
  }

  .progress-steps {
    grid-template-columns: 1fr;
  }

  .progress-steps li {
    padding: 7px 8px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fff;
  }

  .next-task-grid {
    grid-template-columns: 1fr;
  }

  .support-card-grid,
  .dialogue-match-grid,
  .category-cues {
    grid-template-columns: 1fr;
  }

  .retry-listening-panel {
    grid-template-columns: 1fr;
  }

  .chat-bubble,
  .chat-bubble.learner {
    width: 100%;
    max-width: 100%;
  }

  .selected-keywords {
    grid-template-columns: 1fr;
  }

  .extension-flow {
    grid-template-columns: 1fr;
  }

  .travel-card-grid {
    grid-template-columns: 1fr;
  }

  .sel-task-grid {
    grid-template-columns: 1fr;
  }

  .finisher-grid {
    grid-template-columns: 1fr;
  }
}