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

* {
  margin: 0;
  padding: 0;
}

:root {
  --ink: #211813;
  --ink-soft: #5f5047;
  --muted: #8a786b;
  --paper: #fbf4ea;
  --paper-2: #fffaf2;
  --paper-3: #f0e2d0;
  --line: rgba(66, 48, 36, 0.13);
  --line-strong: rgba(66, 48, 36, 0.22);
  --claude: #d97757;
  --claude-dark: #a6523b;
  --amber: #e3b26f;
  --sand: #c98f5b;
  --umber: #7b4a35;
  --success: #8a5a3c;
  --warn: #bf7a1f;
  --danger: #b54848;
  --white: #ffffff;
  --shadow: 0 20px 50px rgba(52, 36, 24, 0.12);
  --shadow-soft: 0 12px 28px rgba(52, 36, 24, 0.08);
  --radius: 8px;
  --nav-h: 76px;
  --sidebar-w: 292px;
  /* แปลงโลโก้ฟ้า-เขียวให้เป็นโทนอุ่นเทอร์ราคอตตาเข้าธีม */
  --logo-filter: grayscale(1) sepia(1) saturate(2.6) hue-rotate(-18deg) brightness(0.95);
}

body.dark-mode {
  --ink: #fff7ec;
  --ink-soft: #d9c7b8;
  --muted: #aa9788;
  --paper: #1f1a15;
  --paper-2: #2b241d;
  --paper-3: #3b3027;
  --line: rgba(255, 247, 236, 0.1);
  --line-strong: rgba(255, 247, 236, 0.18);
  --shadow: 0 22px 56px rgba(0, 0, 0, 0.34);
  --shadow-soft: 0 14px 32px rgba(0, 0, 0, 0.24);
  --logo-filter: grayscale(1) sepia(1) saturate(2.6) hue-rotate(-18deg) brightness(1.08);
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  background:
    radial-gradient(circle at 8% 6%, rgba(217, 119, 87, 0.16), transparent 34vw),
    radial-gradient(circle at 92% 12%, rgba(123, 74, 53, 0.14), transparent 30vw),
    linear-gradient(180deg, var(--paper-2), var(--paper));
  color: var(--ink);
  font-family: 'Kanit', system-ui, sans-serif;
  font-weight: 300;
  line-height: 1.65;
  overflow-x: hidden;
}

a {
  color: inherit;
}

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

button,
input {
  font: inherit;
}

h1,
h2,
h3,
h4,
strong {
  font-weight: 600;
}

.material-icons {
  font-family: 'Material Symbols Outlined';
  font-weight: normal;
  font-style: normal;
  font-size: 20px;
  line-height: 1;
  letter-spacing: normal;
  text-transform: none;
  display: inline-block;
  white-space: nowrap;
  word-wrap: normal;
  direction: ltr;
  -webkit-font-feature-settings: 'liga';
  -webkit-font-smoothing: antialiased;
  font-feature-settings: 'liga';
  font-variation-settings: 'FILL' 1, 'wght' 500, 'GRAD' 0, 'opsz' 24;
  vertical-align: middle;
  overflow: hidden;
}

.skip-link {
  position: fixed;
  left: 50%;
  top: 16px;
  z-index: 999;
  transform: translate(-50%, -200%);
  background: var(--ink);
  color: var(--paper);
  padding: 10px 14px;
  border-radius: 6px;
}

.skip-link:focus {
  transform: translate(-50%, 0);
}

.continue-btn.is-complete {
  border-color: rgba(138, 90, 60, 0.32);
  background: rgba(138, 90, 60, 0.1);
}

.topbar {
  position: fixed;
  inset: 14px 16px auto;
  height: var(--nav-h);
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 0 18px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: color-mix(in srgb, var(--paper-2) 70%, transparent);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-soft);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
  text-decoration: none;
}

.brand img {
  width: clamp(124px, 16vw, 170px);
  height: 54px;
  object-fit: contain;
  filter: var(--logo-filter);
}

.brand-copy {
  display: grid;
  line-height: 1.1;
  min-width: 0;
}

.brand-copy strong {
  font-size: 14px;
  letter-spacing: 0;
  white-space: nowrap;
}

.brand-copy span {
  color: var(--muted);
  font-size: 12px;
  white-space: nowrap;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.lang-button {
  min-width: 42px;
  height: 42px;
  padding: 0 10px;
  border-radius: 9px;
  border: 1px solid var(--line);
  background: var(--paper-2);
  color: var(--ink);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  transition: border-color 180ms ease, background 180ms ease, color 180ms ease;
}

.lang-button:hover,
.lang-button:focus-visible {
  border-color: var(--claude);
  background: rgba(217, 119, 87, 0.12);
  outline: none;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-links a {
  padding: 9px 12px;
  border-radius: 7px;
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 14px;
  font-weight: 400;
  transition: background 180ms ease, color 180ms ease;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  background: rgba(217, 119, 87, 0.12);
  color: var(--claude-dark);
  outline: none;
}

.icon-button {
  width: 42px;
  height: 42px;
  border-radius: 9px;
  border: 1px solid var(--line);
  background: var(--paper-2);
  color: var(--ink);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: border-color 180ms ease, background 180ms ease, color 180ms ease;
}

.icon-button:hover,
.icon-button:focus-visible {
  border-color: var(--claude);
  background: rgba(217, 119, 87, 0.12);
  outline: none;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 42px;
  padding: 10px 16px;
  border: 1px solid transparent;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 500;
  cursor: pointer;
  transition: background 180ms ease, border-color 180ms ease, color 180ms ease, box-shadow 180ms ease;
  white-space: nowrap;
}

.btn-primary {
  background: var(--claude);
  color: #211813;
  box-shadow: 0 10px 24px rgba(217, 119, 87, 0.28);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: #e68a68;
  outline: none;
  box-shadow: 0 14px 32px rgba(217, 119, 87, 0.34);
}

.btn-secondary {
  color: var(--ink);
  border-color: var(--line-strong);
  background: var(--paper-2);
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
  border-color: var(--claude);
  background: rgba(217, 119, 87, 0.1);
  outline: none;
}

.page-shell {
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
  gap: 28px;
  max-width: 1480px;
  margin: 0 auto;
  padding: calc(var(--nav-h) + 42px) 22px 56px;
}

.course-rail {
  position: sticky;
  top: calc(var(--nav-h) + 34px);
  align-self: start;
  max-height: calc(100vh - var(--nav-h) - 48px);
  overflow: auto;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: color-mix(in srgb, var(--paper-2) 100%, transparent);
  box-shadow: var(--shadow-soft);
}

.course-rail h2 {
  font-size: 14px;
  margin: 4px 4px 12px;
}

.progress-card {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(217, 119, 87, 0.12), rgba(227, 178, 111, 0.1));
  margin-bottom: 14px;
}

.progress-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-size: 13px;
  color: var(--ink-soft);
  margin-bottom: 9px;
}

.progress-track {
  height: 10px;
  border-radius: 999px;
  background: rgba(95, 80, 71, 0.16);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--claude), var(--amber));
  border-radius: inherit;
  transition: width 250ms ease;
}

.lesson-nav {
  display: grid;
  gap: 6px;
}

.lesson-nav a {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  padding: 10px;
  border-radius: 8px;
  color: var(--ink-soft);
  text-decoration: none;
  border: 1px solid transparent;
  transition: background 180ms ease, border-color 180ms ease, color 180ms ease;
}

.lesson-nav a:hover,
.lesson-nav a.active {
  background: rgba(217, 119, 87, 0.1);
  border-color: rgba(217, 119, 87, 0.22);
  color: var(--ink);
}

.nav-num {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--paper-3);
  color: var(--ink);
  font-size: 12px;
  font-weight: 500;
  font-family: 'Kanit', system-ui, sans-serif;
}

.lesson-nav strong {
  display: block;
  font-size: 13px;
  line-height: 1.35;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.lesson-nav span:not(.material-icons):not(.nav-num) {
  font-size: 11px;
  color: var(--muted);
}

.lesson-nav .material-icons {
  color: var(--muted);
  font-size: 18px;
}

.lesson-nav a.done .nav-num {
  background: var(--success);
  color: #fff;
}

.lesson-nav a.done .material-icons {
  color: var(--success);
}

main {
  min-width: 0;
}

section,
.lesson-section {
  scroll-margin-top: calc(var(--nav-h) + 48px);
}

.hero {
  min-height: calc(100vh - var(--nav-h) - 56px);
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
  gap: 28px;
  align-items: center;
  padding-bottom: 34px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  width: fit-content;
  padding: 6px 11px;
  border: 1px solid rgba(217, 119, 87, 0.28);
  border-radius: 999px;
  background: rgba(217, 119, 87, 0.1);
  color: var(--claude-dark);
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 18px;
}

.hero h1 {
  max-width: 780px;
  font-size: clamp(34px, 6vw, 68px);
  line-height: 1.05;
  letter-spacing: 0;
  margin-bottom: 18px;
}

.hero h1 span {
  color: var(--claude-dark);
}

.hero-copy {
  max-width: 680px;
  color: var(--ink-soft);
  font-size: clamp(16px, 2vw, 20px);
  margin-bottom: 24px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 26px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  max-width: 690px;
}

.stat {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--paper-2) 82%, transparent);
}

.stat strong {
  display: block;
  font-size: 22px;
  line-height: 1.1;
  color: var(--ink);
}

.stat span {
  color: var(--muted);
  font-size: 13px;
}

.learning-panel {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: color-mix(in srgb, var(--paper-2) 90%, transparent);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.panel-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 18px 18px 0;
}

.panel-top img {
  width: 160px;
  height: 56px;
  object-fit: contain;
}

.course-hero-image {
  margin: 16px 18px 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--paper-3);
}

.course-hero-image img,
.lesson-figure img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.level-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 10px;
  border-radius: 999px;
  background: rgba(123, 74, 53, 0.12);
  color: var(--umber);
  font-size: 12px;
  font-weight: 500;
}

.lesson-preview {
  padding: 18px;
  display: grid;
  gap: 12px;
}

.preview-item {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  padding: 13px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-2);
}

.preview-icon {
  width: 42px;
  height: 42px;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--ink);
  background: rgba(217, 119, 87, 0.14);
}

.preview-item:nth-child(2) .preview-icon {
  background: rgba(201, 143, 91, 0.16);
}

.preview-item:nth-child(3) .preview-icon {
  background: rgba(123, 74, 53, 0.14);
}

.preview-item strong {
  display: block;
  font-size: 14px;
}

.preview-item span {
  color: var(--muted);
  font-size: 12px;
}

.mini-chip {
  padding: 5px 8px;
  border-radius: 999px;
  color: var(--ink-soft);
  background: var(--paper-3);
  font-size: 11px;
  font-weight: 500;
}

.panel-footer {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--line);
  background: rgba(217, 119, 87, 0.06);
}

.panel-footer div {
  padding: 15px;
  border-right: 1px solid var(--line);
}

.panel-footer div:last-child {
  border-right: none;
}

.panel-footer strong {
  display: block;
  font-size: 14px;
}

.panel-footer span {
  font-size: 12px;
  color: var(--muted);
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 20px;
  margin: 38px 0 18px;
}

.section-head h2 {
  font-size: clamp(24px, 3vw, 36px);
  line-height: 1.18;
}

.section-head p {
  max-width: 680px;
  color: var(--ink-soft);
}

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

.outcome-card,
.module-card,
.lesson-section,
.resource-card,
.faq-item {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--paper-2) 88%, transparent);
  box-shadow: var(--shadow-soft);
}

.outcome-card {
  padding: 18px;
  min-height: 156px;
}

.card-icon {
  width: 42px;
  height: 42px;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(217, 119, 87, 0.12);
  color: var(--claude-dark);
  margin-bottom: 12px;
}

.outcome-card:nth-child(2) .card-icon {
  background: rgba(201, 143, 91, 0.16);
  color: var(--sand);
}

.outcome-card:nth-child(3) .card-icon {
  background: rgba(123, 74, 53, 0.14);
  color: var(--umber);
}

.outcome-card:nth-child(4) .card-icon {
  background: rgba(227, 178, 111, 0.2);
  color: var(--warn);
}

.outcome-card h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

.outcome-card p {
  color: var(--ink-soft);
  font-size: 14px;
}

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

.module-card {
  display: grid;
  gap: 12px;
  padding: 18px;
  cursor: pointer;
  transition: border-color 180ms ease, background 180ms ease;
}

.module-card:hover {
  border-color: rgba(217, 119, 87, 0.32);
  background: rgba(217, 119, 87, 0.07);
}

.module-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 400;
}

.module-card h3 {
  font-size: 18px;
  line-height: 1.35;
}

.module-card p {
  color: var(--ink-soft);
  font-size: 14px;
}

.module-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.module-tags span {
  padding: 5px 8px;
  border-radius: 999px;
  background: var(--paper-3);
  color: var(--ink-soft);
  font-size: 11px;
  font-weight: 400;
}

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

.insight-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--paper-2) 88%, transparent);
  box-shadow: var(--shadow-soft);
}

.insight-card img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: contain;
  background: linear-gradient(135deg, rgba(217, 119, 87, 0.1), rgba(123, 74, 53, 0.09));
  padding: 14px;
}

.insight-card div {
  padding: 16px;
}

.insight-card h3 {
  font-size: 17px;
  margin-bottom: 6px;
}

.insight-card p {
  color: var(--ink-soft);
  font-size: 14px;
}

.anatomy-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
}

.anatomy-card {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-2);
  box-shadow: var(--shadow-soft);
}

.anatomy-card .material-icons {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--claude-dark);
  background: rgba(217, 119, 87, 0.12);
  margin-bottom: 12px;
}

.anatomy-card h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

.anatomy-card p {
  color: var(--ink-soft);
  font-size: 13px;
}

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

.role-card {
  display: grid;
  gap: 12px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--paper-2) 88%, transparent);
  box-shadow: var(--shadow-soft);
}

.role-card header {
  display: flex;
  align-items: center;
  gap: 10px;
}

.role-card header .material-icons {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--umber);
  background: rgba(123, 74, 53, 0.12);
}

.role-card h3 {
  font-size: 17px;
}

.role-card p,
.role-card li {
  color: var(--ink-soft);
  font-size: 14px;
}

.role-card ul {
  display: grid;
  gap: 7px;
  padding-left: 18px;
}

.deliverable-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.85fr);
  gap: 18px;
  padding: 22px;
  border: 1px solid rgba(217, 119, 87, 0.28);
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(217, 119, 87, 0.12), rgba(123, 74, 53, 0.08));
  box-shadow: var(--shadow-soft);
}

.deliverable-copy {
  display: grid;
  gap: 14px;
  align-content: start;
}

.deliverable-copy h3 {
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1.18;
}

.deliverable-copy p {
  color: var(--ink-soft);
}

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

.download-note {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  color: var(--muted);
  font-size: 13px;
}

.download-hero-art {
  margin-top: auto;
  overflow: hidden;
  border: 1px solid rgba(217, 119, 87, 0.18);
  border-radius: 14px;
  background: rgba(255, 250, 242, 0.44);
  box-shadow: var(--shadow-soft);
}

.download-hero-art img {
  width: 100%;
  min-height: 280px;
  max-height: 520px;
  object-fit: cover;
  object-position: center bottom;
}

.deliverable-grid {
  display: grid;
  gap: 12px;
}

.deliverable-card {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--paper-2) 88%, transparent);
}

.deliverable-card h4 {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 16px;
  margin-bottom: 8px;
}

.deliverable-card p,
.deliverable-card li {
  color: var(--ink-soft);
  font-size: 14px;
}

.deliverable-card ul {
  display: grid;
  gap: 6px;
  padding-left: 18px;
  margin-top: 8px;
}

.lesson-stack {
  display: grid;
  gap: 18px;
}

.lesson-section {
  overflow: hidden;
}

.lesson-header {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr) auto;
  gap: 16px;
  align-items: start;
  padding: 22px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(135deg, rgba(217, 119, 87, 0.08), transparent);
}

.lesson-index {
  width: 62px;
  height: 62px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  background: var(--ink);
  color: var(--paper);
  font-family: 'Kanit', system-ui, sans-serif;
  font-weight: 500;
}

.lesson-kicker {
  color: var(--claude-dark);
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 4px;
}

.lesson-header h3 {
  font-size: clamp(20px, 2.4vw, 28px);
  line-height: 1.22;
}

.lesson-header p {
  color: var(--ink-soft);
  margin-top: 8px;
  max-width: 850px;
}

.complete-box {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 42px;
  padding: 9px 12px;
  border-radius: 8px;
  border: 1px solid var(--line);
  color: var(--ink-soft);
  background: var(--paper-2);
  white-space: nowrap;
  cursor: pointer;
  user-select: none;
}

.complete-box input {
  width: 16px;
  height: 16px;
  accent-color: var(--success);
  cursor: pointer;
}

.lesson-body {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(280px, 0.7fr);
  gap: 18px;
  padding: 22px;
}

.content-flow {
  display: grid;
  gap: 16px;
  min-width: 0;
}

.content-flow h4 {
  font-size: 18px;
  margin-bottom: -4px;
}

.content-flow p,
.content-flow li {
  color: var(--ink-soft);
}

.content-flow ul,
.content-flow ol {
  padding-left: 22px;
  display: grid;
  gap: 8px;
}

.content-flow code,
.lesson-side code,
.code-block {
  font-family: 'Kanit', system-ui, sans-serif;
  font-size: 13px;
}

.content-flow code,
.lesson-side code {
  color: var(--claude-dark);
  background: rgba(217, 119, 87, 0.12);
  padding: 1px 5px;
  border-radius: 5px;
}

.lesson-summary {
  display: grid;
  gap: 10px;
  padding: 15px;
  border: 1px solid rgba(123, 74, 53, 0.18);
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, rgba(255, 250, 242, 0.92), rgba(240, 226, 208, 0.58));
}

.lesson-summary h4 {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
}

.lesson-summary h4 .material-icons {
  width: 34px;
  height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  color: var(--claude-dark);
  background: rgba(217, 119, 87, 0.13);
}

.lesson-summary ul {
  margin: 0;
}

body.dark-mode .lesson-summary {
  background:
    linear-gradient(135deg, rgba(43, 36, 29, 0.94), rgba(59, 48, 39, 0.74));
}

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

.lesson-link-card {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 10px;
  align-items: center;
  padding: 13px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-2);
  text-decoration: none;
  transition: border-color 180ms ease, background 180ms ease, transform 180ms ease;
}

.lesson-link-card:hover,
.lesson-link-card:focus-visible {
  border-color: rgba(217, 119, 87, 0.34);
  background: rgba(217, 119, 87, 0.08);
  transform: translateY(-1px);
  outline: none;
}

.lesson-link-card>.material-icons {
  width: 38px;
  height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  color: var(--claude-dark);
  background: rgba(217, 119, 87, 0.13);
}

.lesson-link-card strong {
  display: block;
  font-size: 14px;
  line-height: 1.35;
}

.lesson-link-card small {
  display: block;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.45;
  margin-top: 2px;
}

.install-tabs {
  display: grid;
  gap: 12px;
}

.install-tab-list {
  display: inline-grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 6px;
  width: min(420px, 100%);
  padding: 5px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--paper-3);
}

.install-tab {
  min-height: 38px;
  border: 0;
  border-radius: 7px;
  background: transparent;
  color: var(--ink-soft);
  cursor: pointer;
  font-weight: 500;
}

.install-tab.active {
  color: var(--ink);
  background: var(--paper-2);
  box-shadow: var(--shadow-soft);
}

.install-panel {
  display: none;
}

.install-panel.active {
  display: grid;
  gap: 10px;
}

.install-panel>p {
  color: var(--ink-soft);
  font-size: 14px;
}

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

.surface-card {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 10px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-2);
}

.surface-card>.material-icons {
  width: 38px;
  height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  color: var(--claude-dark);
  background: rgba(217, 119, 87, 0.13);
}

.surface-card strong {
  display: block;
  margin-bottom: 3px;
}

.surface-card p {
  color: var(--ink-soft);
  font-size: 14px;
  margin: 0;
}

.code-block {
  position: relative;
  overflow-x: auto;
  padding: 16px 48px 16px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #211813;
  color: #fff7ec;
  line-height: 1.7;
  white-space: pre-wrap;
  tab-size: 2;
}

.copy-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 32px;
  height: 32px;
  border-radius: 7px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(255, 255, 255, 0.08);
  color: #fff7ec;
  cursor: pointer;
}

.copy-btn:hover,
.copy-btn:focus-visible {
  background: rgba(255, 255, 255, 0.16);
  outline: none;
}

.callout {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 12px;
  padding: 15px;
  border-radius: var(--radius);
  border: 1px solid rgba(217, 119, 87, 0.22);
  background: rgba(217, 119, 87, 0.09);
}

.callout .material-icons {
  width: 38px;
  height: 38px;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--claude-dark);
  background: rgba(217, 119, 87, 0.13);
}

.callout strong {
  display: block;
  margin-bottom: 4px;
}

.callout p {
  margin: 0;
}

.callout.umber {
  border-color: rgba(123, 74, 53, 0.24);
  background: rgba(123, 74, 53, 0.09);
}

.callout.umber .material-icons {
  color: var(--umber);
  background: rgba(123, 74, 53, 0.13);
}

.callout.warn {
  border-color: rgba(191, 122, 31, 0.25);
  background: rgba(227, 178, 111, 0.14);
}

.callout.warn .material-icons {
  color: var(--warn);
  background: rgba(227, 178, 111, 0.18);
}

.lesson-figure,
.lesson-diagram,
.pack-visual {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 14px;
  background:
    radial-gradient(circle at 18% 20%, rgba(217, 119, 87, 0.18), transparent 32%),
    radial-gradient(circle at 84% 12%, rgba(227, 178, 111, 0.22), transparent 30%),
    linear-gradient(135deg, rgba(255, 248, 238, 0.96), rgba(243, 232, 218, 0.84));
  box-shadow: var(--shadow-soft);
}

.lesson-figure {
  background: var(--paper-3);
}

.lesson-diagram,
.pack-visual {
  padding: 18px;
  min-height: 220px;
  display: grid;
  align-content: center;
  gap: 14px;
}

.diagram-title {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--ink);
  font-size: 15px;
  font-weight: 500;
}

.diagram-title .material-icons {
  width: 34px;
  height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  color: var(--claude-dark);
  background: rgba(217, 119, 87, 0.14);
}

.diagram-flow {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  align-items: stretch;
}

.diagram-step {
  position: relative;
  min-height: 86px;
  padding: 14px 12px;
  border: 1px solid rgba(123, 74, 53, 0.16);
  border-radius: 12px;
  background: rgba(255, 252, 247, 0.82);
  color: var(--ink-soft);
  font-size: 13px;
}

.diagram-step strong {
  display: block;
  color: var(--ink);
  font-size: 14px;
  margin-bottom: 4px;
}

.diagram-step .material-icons {
  color: var(--claude-dark);
  font-size: 22px;
  margin-bottom: 6px;
}

.folder-tree {
  display: grid;
  gap: 8px;
  color: var(--ink-soft);
  font-size: 13px;
}

.folder-row {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 8px;
  align-items: center;
  padding: 9px 10px;
  border: 1px solid rgba(123, 74, 53, 0.14);
  border-radius: 10px;
  background: rgba(255, 252, 247, 0.76);
}

.folder-row .material-icons {
  color: var(--claude-dark);
  font-size: 21px;
}

.plugin-orbit {
  position: relative;
  min-height: 230px;
  display: grid;
  place-items: center;
}

.plugin-core {
  width: 122px;
  height: 122px;
  display: grid;
  place-items: center;
  border-radius: 26px;
  background: linear-gradient(135deg, var(--claude), var(--umber));
  color: #fffaf2;
  box-shadow: 0 18px 42px rgba(123, 74, 53, 0.25);
}

.plugin-core .material-icons {
  font-size: 46px;
}

.orbit-node {
  position: absolute;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-width: 104px;
  padding: 9px 10px;
  border: 1px solid rgba(123, 74, 53, 0.14);
  border-radius: 999px;
  background: rgba(255, 252, 247, 0.9);
  color: var(--ink-soft);
  font-size: 12px;
  box-shadow: var(--shadow-soft);
}

.orbit-node .material-icons {
  color: var(--claude-dark);
  font-size: 18px;
}

.orbit-node:nth-child(2) {
  top: 8px;
  left: 50%;
  transform: translateX(-50%);
}

.orbit-node:nth-child(3) {
  top: 72px;
  right: 6px;
}

.orbit-node:nth-child(4) {
  bottom: 16px;
  right: 42px;
}

.orbit-node:nth-child(5) {
  bottom: 16px;
  left: 42px;
}

.orbit-node:nth-child(6) {
  top: 72px;
  left: 6px;
}

.pack-stack {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: 14px;
  align-items: center;
}

.zip-box {
  width: 88px;
  height: 104px;
  display: grid;
  place-items: center;
  border-radius: 18px;
  background: linear-gradient(135deg, var(--ink), var(--umber));
  color: #fff7ec;
  box-shadow: 0 16px 32px rgba(33, 24, 19, 0.2);
}

.zip-box .material-icons {
  font-size: 42px;
}

.pack-stack .folder-tree {
  gap: 6px;
}

.lesson-side {
  display: grid;
  gap: 12px;
  align-content: start;
}

.side-card {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-2);
}

.side-card h4 {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  margin-bottom: 10px;
}

.side-card ul {
  display: grid;
  gap: 8px;
  padding-left: 18px;
  color: var(--ink-soft);
  font-size: 14px;
}

.task-list {
  display: grid;
  gap: 8px;
}

.task-list label {
  display: block;
  position: relative;
  padding-left: 26px;
  color: var(--ink-soft);
  font-size: 14px;
  cursor: pointer;
}

.task-list input {
  position: absolute;
  left: 0;
  top: 4px;
  accent-color: var(--success);
  cursor: pointer;
}

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

.resource-card {
  padding: 18px;
  display: grid;
  gap: 10px;
}

.resource-card h3 {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 17px;
}

.resource-card p {
  color: var(--ink-soft);
  font-size: 14px;
}

.resource-card a {
  color: var(--claude-dark);
  font-weight: 500;
  text-decoration: none;
}

.resource-card a:hover {
  text-decoration: underline;
}

.practice-lab {
  margin-top: 18px;
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 18px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background:
    linear-gradient(135deg, rgba(33, 24, 19, 0.92), rgba(79, 53, 39, 0.9)),
    var(--ink);
  color: #fff7ec;
  box-shadow: var(--shadow);
}

.practice-lab h4 {
  color: #fff7ec;
  font-size: 20px;
  line-height: 1.35;
  margin: 8px 0;
}

.practice-lab p {
  color: #d9c7b8;
}

.practice-lab .eyebrow {
  color: #f2c7aa;
  background: rgba(255, 247, 236, 0.08);
  border-color: rgba(255, 247, 236, 0.14);
  width: fit-content;
}

.practice-lab .lesson-links {
  margin-top: 14px;
  grid-template-columns: 1fr;
}

.practice-lab .lesson-link-card {
  border-color: rgba(255, 255, 255, 0.14);
  background: rgba(255, 255, 255, 0.06);
}

.practice-lab .lesson-link-card:hover,
.practice-lab .lesson-link-card:focus-visible {
  border-color: rgba(242, 199, 170, 0.42);
  background: rgba(255, 255, 255, 0.1);
}

.practice-lab .lesson-link-card strong {
  color: #fff7ec;
}

.practice-lab .lesson-link-card small {
  color: #d9c7b8;
}

.practice-steps {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}

.practice-steps>div {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  padding: 12px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.06);
}

.practice-steps>div>span:first-child {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--claude);
  color: #211813;
  font-weight: 600;
  font-family: 'Kanit', system-ui, sans-serif;
}

.practice-steps>div>p {
  margin: 0;
  min-width: 0;
}

.lab-check {
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  padding: 12px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.08);
  color: #fff7ec;
  cursor: pointer;
  font-size: 14px;
}

.lab-check input {
  margin-top: 4px;
  accent-color: var(--claude);
  cursor: pointer;
}

.lab-check>span {
  min-width: 0;
}

.faq-list {
  display: grid;
  gap: 10px;
}

.faq-item {
  overflow: hidden;
}

.faq-item summary {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 18px;
  cursor: pointer;
  font-weight: 500;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item p {
  padding: 0 18px 18px;
  color: var(--ink-soft);
}

.final-cta {
  margin-top: 26px;
  padding: 28px;
  border: 1px solid rgba(217, 119, 87, 0.28);
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(217, 119, 87, 0.16), rgba(123, 74, 53, 0.1));
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.final-cta h2 {
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1.2;
}

.final-cta p {
  color: var(--ink-soft);
  margin-top: 6px;
  max-width: 680px;
}

footer {
  border-top: 1px solid var(--line);
  margin-top: 38px;
  padding: 26px 0 10px;
  color: var(--muted);
  font-size: 13px;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
}

.footer-inner img {
  width: 132px;
  height: 48px;
  object-fit: contain;
  filter: var(--logo-filter);
}

.support-float {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 70;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 48px;
  padding: 10px 14px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--claude), var(--umber));
  color: #fff;
  text-decoration: none;
  box-shadow: 0 12px 30px rgba(123, 74, 53, 0.28);
  font-weight: 500;
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.support-float:hover,
.support-float:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 16px 36px rgba(123, 74, 53, 0.36);
  outline: none;
}

.mobile-rail-toggle {
  display: none;
}

.rail-backdrop {
  display: none;
}

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

  .course-rail {
    position: fixed;
    top: calc(var(--nav-h) + 34px);
    left: 16px;
    bottom: 16px;
    width: min(340px, calc(100vw - 32px));
    z-index: 60;
    transform: translateX(calc(-100% - 24px));
    transition: transform 220ms ease;
  }

  .course-rail.open {
    transform: translateX(0);
  }

  .mobile-rail-toggle {
    display: inline-flex;
  }

  .rail-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 55;
    background: rgba(33, 24, 19, 0.45);
    opacity: 0;
    pointer-events: none;
    transition: opacity 180ms ease;
  }

  .rail-backdrop.open {
    opacity: 1;
    pointer-events: auto;
  }

  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
  }

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

  .module-grid,
  .resource-grid,
  .insight-grid,
  .role-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

@media (max-width: 780px) {
  :root {
    --nav-h: 66px;
  }

  .topbar {
    inset: 10px 10px auto;
    padding: 0 10px;
    border-radius: 12px;
  }

  .brand img {
    width: 116px;
    height: 46px;
  }

  .brand-copy,
  .nav-links,
  .nav-actions .btn {
    display: none;
  }

  .page-shell {
    padding: calc(var(--nav-h) + 34px) 12px 40px;
  }

  .hero h1 {
    font-size: clamp(32px, 12vw, 48px);
  }

  .hero-stats,
  .outcomes-grid,
  .module-grid,
  .resource-grid,
  .insight-grid,
  .anatomy-grid,
  .role-grid,
  .lesson-body,
  .practice-lab {
    grid-template-columns: 1fr;
  }

  .download-actions .btn {
    width: 100%;
  }

  .download-hero-art img {
    min-height: 220px;
    max-height: 360px;
  }

  .lesson-links {
    grid-template-columns: 1fr;
  }

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

  .lesson-header {
    grid-template-columns: 48px minmax(0, 1fr);
    padding: 18px;
  }

  .lesson-index {
    width: 48px;
    height: 48px;
    border-radius: 10px;
  }

  .complete-box {
    grid-column: 1 / -1;
    width: 100%;
    justify-content: center;
  }

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

  .panel-footer div {
    border-right: none;
    border-bottom: 1px solid var(--line);
  }

  .panel-footer div:last-child {
    border-bottom: none;
  }

  .diagram-flow,
  .pack-stack {
    grid-template-columns: 1fr;
  }

  .plugin-orbit {
    min-height: 360px;
  }

  .orbit-node:nth-child(2) {
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
  }

  .orbit-node:nth-child(3) {
    top: 86px;
    right: 50%;
    transform: translateX(50%);
  }

  .orbit-node:nth-child(4) {
    bottom: 92px;
    right: 50%;
    transform: translateX(50%);
  }

  .orbit-node:nth-child(5) {
    bottom: 16px;
    left: 50%;
    transform: translateX(-50%);
  }

  .orbit-node:nth-child(6) {
    top: 164px;
    left: 50%;
    transform: translateX(-50%);
  }

  .section-head {
    display: grid;
  }

  .final-cta {
    display: grid;
    padding: 22px;
  }

  .final-cta .btn {
    width: 100%;
  }

  .support-float {
    right: 12px;
    bottom: 12px;
    padding-inline: 12px;
  }

  .support-float [data-lang] {
    display: none !important;
  }
}

@media (max-width: 430px) {
  .preview-item {
    grid-template-columns: 38px minmax(0, 1fr);
  }

  .preview-item .mini-chip {
    grid-column: 1 / -1;
    width: fit-content;
  }

  .hero-actions .btn {
    width: 100%;
    white-space: normal;
  }

  .lesson-body,
  .lesson-header {
    padding: 14px;
  }

  .code-block {
    padding-right: 16px;
    padding-top: 48px;
  }

  .copy-btn {
    left: 12px;
    right: auto;
  }
}

@media (prefers-reduced-motion: reduce) {

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}

html.lang-en [data-lang="th"] {
  display: none !important;
}

html:not(.lang-en) [data-lang="en"] {
  display: none !important;
}