:root {
  --ink: #1c1915;
  --muted: #5e574e;
  --line: #e4d8c6;
  --paper: #f7f3ea;
  --card: #fffdf9;
  --forest: #1c4a3e;
  --forest-2: #12352d;
  --gold: #8a6428;
  --clay: #c45c3e;
  --sage: #2f6b54;
  --shadow: 0 16px 40px rgba(28, 40, 30, 0.08);
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Source Sans 3", "Noto Sans Malayalam", "Malayalam MN", "Malayalam Sangam MN", sans-serif;
  font-size: 16px;
  line-height: 1.7;
}
a { color: var(--forest); }
button, input { font: inherit; }
img, svg { max-width: 100%; }
.site-header {
  position: sticky; top: 0; z-index: 30;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 12px 18px;
  background: rgba(247, 243, 234, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
}
.brand { display: flex; align-items: center; gap: 10px; min-width: 0; text-decoration: none; color: var(--forest-2); font-weight: 800; line-height: 1.25; font-family: Syne, "Source Sans 3", sans-serif; letter-spacing: -0.02em; }
.mark svg { width: 20px; height: 20px; display: block; }
.brand small { display: block; font-weight: 600; color: var(--muted); font-size: 12px; font-family: "Source Sans 3", sans-serif; letter-spacing: 0; }
h1.brand-hero {
  margin: 0 0 12px;
  font-family: Syne, "Source Sans 3", sans-serif;
  font-size: clamp(48px, 8vw, 80px);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 0.95;
  color: var(--forest);
}
.course-name { font-size: 22px; margin: 0 0 8px; }
.course-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 16px; }
.course-card { height: 100%; }
@media (max-width: 860px) {
  .course-grid { grid-template-columns: 1fr; }
}
.mark {
  width: 36px; height: 36px; border-radius: 10px; display: grid; place-items: center;
  background: var(--forest); color: #f6f1e6; flex: 0 0 auto;
}
.nav { display: flex; align-items: center; gap: 8px; }
.nav a, .btn, .ghost {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 42px; padding: 8px 14px; border-radius: 999px; text-decoration: none; font-weight: 700;
}
.nav a.quiet { color: var(--forest); background: transparent; }
.btn { border: 0; cursor: pointer; background: var(--forest); color: #fff; }
.btn:hover { background: var(--clay); }
.ghost { border: 1px solid var(--line); background: #fff; color: var(--forest); cursor: pointer; }
.menu-btn { display: none; }
.wrap { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.hero {
  display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 28px; align-items: center;
  padding: 42px 0 20px;
}
.kicker { margin: 0 0 6px; color: var(--gold); font-weight: 800; font-size: 13px; }
h1, h2, h3 { line-height: 1.3; color: var(--forest-2); }
h1 { font-size: clamp(34px, 5vw, 54px); margin: 0 0 10px; }
h2 { font-size: clamp(26px, 3vw, 34px); margin: 0 0 8px; }
.lead { font-size: 18px; }
.price-card, .panel, .module, .auth-card, .paywall {
  background: var(--card); border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow);
}
.price-card { padding: 22px; }
.price { font-size: 42px; font-weight: 800; color: var(--forest); margin: 0; }
.price span { font-size: 16px; color: var(--muted); font-weight: 600; }
.section { padding: 28px 0 10px; }
.module { margin-bottom: 12px; overflow: hidden; }
.module summary {
  cursor: pointer; list-style: none; padding: 14px 16px;
  display: flex; justify-content: space-between; gap: 12px; align-items: center; font-weight: 800; color: var(--forest);
}
.module summary::-webkit-details-marker { display: none; }
.module p { margin: 0 16px 8px; color: var(--muted); }
.lesson-link {
  display: flex; justify-content: space-between; gap: 10px; align-items: center;
  padding: 10px 16px; border-top: 1px solid var(--line); text-decoration: none; color: inherit;
}
.lesson-link small { color: var(--muted); }
.lock { color: var(--gold); font-size: 13px; font-weight: 800; }
.auth-wrap { min-height: calc(100vh - 70px); display: grid; place-items: center; padding: 24px 16px 48px; }
.auth-card { width: min(460px, 100%); padding: 22px; }
.auth-card select {
  width: 100%; min-height: 46px; border-radius: 12px; border: 1px solid var(--line);
  padding: 10px 12px; background: #fff; color: var(--ink);
}
label { display: block; font-weight: 700; margin: 12px 0 6px; color: var(--forest); }
input {
  width: 100%; min-height: 46px; border-radius: 12px; border: 1px solid var(--line);
  padding: 10px 12px; background: #fff; color: var(--ink);
}
.error { color: var(--clay); font-weight: 700; min-height: 1.4em; }
.player { display: grid; grid-template-columns: 300px 1fr; min-height: calc(100vh - 67px); }
.sidebar {
  border-right: 1px solid var(--line); background: #fffdf9; padding: 12px;
  max-height: calc(100vh - 67px); overflow: auto; position: sticky; top: 67px;
}
.side-mod { margin-bottom: 8px; }
.side-mod button.mod {
  width: 100%; text-align: left; border: 0; background: transparent; cursor: pointer;
  font-weight: 800; color: var(--forest); padding: 8px; border-radius: 10px;
}
.side-mod button.lesson {
  width: 100%; text-align: left; border: 0; background: transparent; cursor: pointer;
  padding: 8px 8px 8px 16px; border-radius: 10px; color: var(--ink);
}
.side-mod button.lesson.active { background: #e7f2ec; color: var(--forest); font-weight: 800; }
.stage { padding: 22px 22px 80px; min-width: 0; }
.pager { display: flex; justify-content: space-between; gap: 10px; margin-top: 18px; }
.paywall { padding: 22px; }
.lesson .card, .lesson .step, .lesson .note, .lesson .ex, .lesson .pillar, .lesson .check {
  background: #fff; border: 1px solid var(--line); border-radius: 14px;
}
.lesson .card, .lesson .pillar { padding: 12px; margin: 8px 0; }
.lesson .step { display: grid; grid-template-columns: 42px 1fr; gap: 8px; padding: 10px 12px; margin: 8px 0; }
.lesson .step b { color: var(--gold); }
.lesson .note { display: grid; grid-template-columns: auto 1fr; gap: 10px; padding: 12px; background: #f8f1df; margin: 10px 0; }
.lesson .note .label { color: var(--gold); font-weight: 800; }
.lesson .warn { background: #fdeee8; }
.lesson .grid-2, .lesson .grid-3, .lesson .checks { display: grid; gap: 10px; }
.lesson .grid-2, .lesson .checks { grid-template-columns: 1fr 1fr; }
.lesson .grid-3 { grid-template-columns: 1fr 1fr 1fr; }
.lesson .ex { padding: 10px 12px; margin: 0; }
.lesson .ex b, .lesson .ex em { display: block; }
.lesson .ex em { color: var(--sage); font-style: normal; font-weight: 700; }
.lesson .row { display: grid; grid-template-columns: 92px 1.2fr .9fr; gap: 8px; padding: 8px 0; border-bottom: 1px solid var(--line); }
.lesson .check { display: grid; grid-template-columns: 22px 1fr; gap: 8px; padding: 8px 10px; }
.lesson .prompt-box { border-radius: 16px; overflow: hidden; background: #14241f; color: #f6f1e6; margin: 10px 0; }
.lesson .prompt-top { display: flex; justify-content: space-between; gap: 8px; align-items: center; padding: 10px 12px; background: #1d332c; font-weight: 700; }
.lesson .prompt { margin: 0; padding: 12px 14px 14px; white-space: pre-wrap; overflow-wrap: anywhere; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 13px; line-height: 1.55; color: #f6f1e6; }
.lesson .ico { width: 22px; height: 22px; display: block; }
.lesson .blob { width: 36px; height: 36px; border-radius: 11px; display: grid; place-items: center; color: #fff; background: var(--forest); flex: 0 0 auto; }
.lesson .clay { background: var(--clay); }
.lesson .gold { background: var(--gold); }
.lesson .sage { background: var(--sage); }
.lesson .headrow { display: flex; gap: 10px; align-items: center; margin-bottom: 6px; }
.lesson .small { font-size: 13.5px; }
.lesson .quote { font-size: 22px; line-height: 1.5; color: var(--forest); }
.lesson .stack { display: flex; flex-direction: column; gap: 10px; }
.progress { height: 6px; border-radius: 99px; background: #efe6d6; margin: 4px 8px 12px; overflow: hidden; }
.progress span { display: block; height: 100%; background: var(--sage); }
.side-mod button.lesson.read::after { content: "✓"; float: right; color: var(--sage); font-weight: 800; }
#logout-side { width: 100%; margin-top: 12px; }
.where { color: var(--muted); font-weight: 700; align-self: center; }
.lesson .copy { border: 0; border-radius: 999px; background: var(--gold); color: #fff; padding: 6px 10px; cursor: pointer; font-weight: 800; }
.lesson .banner, .lesson .mock { border-radius: 14px; overflow: hidden; margin: 8px 0; }
.lesson .banner svg, .lesson .mock svg { display: block; width: 100%; height: auto; }
.backdrop { display: none; }
@media (max-width: 860px) {
  .menu-btn { display: inline-flex; }
  .brand small { display: none; }
  .site-header:has(.menu-btn) .nav { display: none; position: absolute; top: 64px; left: 0; right: 0; flex-direction: column; align-items: stretch; padding: 10px; background: #fffdf9; border-bottom: 1px solid var(--line); }
  .site-header:has(.menu-btn) .nav.open { display: flex; }
  .hero, .player, .lesson .grid-2, .lesson .grid-3, .lesson .checks, .lesson .row { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed; z-index: 40; top: 0; left: 0; bottom: 0; width: min(320px, 88vw);
    max-height: none; transform: translateX(-105%); transition: transform .2s ease;
  }
  .sidebar.open { transform: none; }
  .backdrop.show { display: block; position: fixed; inset: 0; background: rgba(18, 28, 22, .45); z-index: 35; }
  .stage { padding: 16px 14px 88px; }
  .pager { position: sticky; bottom: 0; background: rgba(247, 243, 234, .95); padding: 10px 0; }
}