:root {
  --bg: #fff7ed;
  --text: #241407;
  --muted: #7c5b35;
  --primary: #d97706;
  --primary-dark: #92400e;
  --accent: #f59e0b;
  --soft: #ffedd5;
  --line: #fed7aa;
  --code-bg: #1f1308;
  --code-text: #fff7ed;
  --success: #15803d;
  --danger: #b91c1c;
  --info: #0369a1;
  --shadow: 0 18px 45px rgba(120, 53, 15, 0.14);
  --radius: 24px;
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background:
    radial-gradient(circle at top left, #fed7aa 0, transparent 28%),
    radial-gradient(circle at top right, #fde68a 0, transparent 24%), var(--bg);
  color: var(--text);
  line-height: 1.7;
}
a {
  color: var(--primary-dark);
  font-weight: 800;
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}
.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 247, 237, 0.94);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.topbar-inner {
  max-width: 1240px;
  margin: auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 900;
  color: var(--primary-dark);
  line-height: 1.25;
}
.brand-icon {
  width: 44px;
  height: 44px;
  border-radius: 15px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: grid;
  place-items: center;
  color: white;
  font-weight: 900;
  box-shadow: 0 10px 22px rgba(217, 119, 6, 0.28);
}
.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: flex-end;
}
.nav a {
  font-size: 14px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  color: var(--primary-dark);
}
.hero {
  max-width: 1240px;
  margin: 0 auto;
  padding: 56px 20px 28px;
}
.hero-card {
  background: linear-gradient(135deg, #fff, #ffedd5);
  border: 1px solid var(--line);
  border-radius: 34px;
  box-shadow: var(--shadow);
  padding: 44px;
  overflow: hidden;
  position: relative;
}
.badge {
  display: inline-flex;
  background: #fff7ed;
  border: 1px solid var(--line);
  color: var(--primary-dark);
  padding: 8px 14px;
  border-radius: 999px;
  font-weight: 800;
  margin-bottom: 18px;
}
h1 {
  font-size: clamp(34px, 6vw, 64px);
  line-height: 1.05;
  margin: 0 0 18px;
  color: var(--primary-dark);
  max-width: 950px;
}
.hero p {
  max-width: 900px;
  font-size: 20px;
  color: var(--muted);
  margin: 0 0 24px;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 24px;
}
.btn {
  border: 0;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 18px;
  border-radius: 16px;
  font-weight: 900;
  font-size: 15px;
  text-decoration: none;
}
.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 12px 24px rgba(217, 119, 6, 0.25);
}
.btn-secondary {
  background: #fff;
  color: var(--primary-dark);
  border: 1px solid var(--line);
}
.container {
  max-width: 1240px;
  margin: auto;
  padding: 22px 20px 70px;
  display: grid;
  grid-template-columns: 310px 1fr;
  gap: 24px;
  align-items: start;
}
.sidebar {
  position: sticky;
  top: 86px;
  background: rgba(255, 255, 255, 0.86);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
  max-height: calc(100vh - 110px);
  overflow: auto;
}
.sidebar h3 {
  margin: 0 0 12px;
  color: var(--primary-dark);
}
.sidebar a {
  display: block;
  padding: 9px 10px;
  border-radius: 12px;
  color: var(--muted);
  font-weight: 700;
  font-size: 14px;
}
.sidebar a:hover {
  background: var(--soft);
  text-decoration: none;
  color: var(--primary-dark);
}
.content {
  display: grid;
  gap: 22px;
}
section.lesson {
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
}
section.lesson h2 {
  margin: 0 0 12px;
  color: var(--primary-dark);
  font-size: 30px;
  line-height: 1.2;
}
section.lesson h3 {
  margin-top: 24px;
  color: var(--primary-dark);
}
.note,
.success,
.warning,
.info {
  padding: 16px 18px;
  border-radius: 16px;
  margin: 18px 0;
}
.note {
  background: #fffbeb;
  border-left: 5px solid var(--accent);
}
.success {
  background: #f0fdf4;
  border-left: 5px solid var(--success);
}
.warning {
  background: #fef2f2;
  border-left: 5px solid var(--danger);
}
.info {
  background: #f0f9ff;
  border-left: 5px solid var(--info);
}
pre {
  position: relative;
  background: var(--code-bg);
  color: var(--code-text);
  padding: 46px 18px 18px;
  border-radius: 18px;
  overflow-x: auto;
  border: 1px solid #3b220f;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.04);
}
code {
  font-family: Consolas, Monaco, "Courier New", monospace;
  font-size: 14px;
}
.copy-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  border-radius: 10px;
  padding: 6px 9px;
  cursor: pointer;
  font-weight: 800;
  font-size: 12px;
}
.copy-btn:hover {
  background: rgba(255, 255, 255, 0.16);
}
.table-wrap {
  overflow-x: auto;
  border-radius: 18px;
  border: 1px solid var(--line);
  margin-top: 16px;
}
table {
  width: 100%;
  border-collapse: collapse;
  background: white;
  min-width: 850px;
}
th,
td {
  padding: 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}
th {
  background: var(--soft);
  color: var(--primary-dark);
}
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 18px;
}
.card {
  background: #fff7ed;
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 16px;
}
.card strong {
  color: var(--primary-dark);
  display: block;
  margin-bottom: 6px;
}
.speak-tag-label {
  display: inline-flex;
  margin-bottom: 10px;
  padding: 5px 10px;
  border-radius: 999px;
  background: #fff7ed;
  border: 1px solid #fed7aa;
  color: #92400e;
  font-size: 12px;
  font-weight: 900;
}
.checkpoint {
  margin-top: 22px;
  padding: 18px;
  border-radius: 20px;
  border: 1px solid #fed7aa;
  background: linear-gradient(135deg, #fff7ed, #fffbeb);
  box-shadow: 0 12px 26px rgba(120, 53, 15, 0.08);
}
.checkpoint h3 {
  margin: 0 0 10px;
  color: #92400e;
  font-size: 20px;
}
.checkpoint-list {
  display: grid;
  gap: 9px;
  margin-top: 12px;
}
.checkpoint-list label {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  background: #fff;
  border: 1px solid #fed7aa;
  border-radius: 14px;
  padding: 10px 12px;
  font-weight: 700;
  color: var(--muted);
}
.checkpoint-list input {
  margin-top: 5px;
  transform: scale(1.2);
  accent-color: #d97706;
}
.checkpoint-continue {
  margin-top: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: 14px;
  padding: 10px 14px;
  background: #d97706;
  color: white;
  font-weight: 900;
  cursor: pointer;
}
.checkpoint-continue:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}
.checkpoint-status {
  margin-top: 10px;
  font-size: 14px;
  color: #7c5b35;
  font-weight: 800;
}
.footer {
  max-width: 1240px;
  margin: 0 auto 36px;
  padding: 24px 20px;
  color: var(--muted);
  text-align: center;
}
@media (max-width: 980px) {
  .container {
    grid-template-columns: 1fr;
  }
  .sidebar {
    position: static;
    max-height: none;
  }
  .cards {
    grid-template-columns: 1fr;
  }
  .hero-card {
    padding: 28px;
  }
}
@media print {
  .topbar,
  .sidebar,
  .hero-actions,
  .copy-btn,
  .checkpoint-continue {
    display: none;
  }
  body {
    background: white;
  }
  .container {
    display: block;
  }
  section.lesson,
  .hero-card {
    box-shadow: none;
    break-inside: avoid;
  }
}
pre,code{
    color: teal !important;
}