:root {
  --bg: #f8f4ef;
  --surface: rgba(255,255,255,0.86);
  --surface-strong: #fffaf5;
  --border: rgba(221,121,88,0.16);
  --text: #203b43;
  --muted: #57707a;
  --accent: #DD7958;
  --accent-dark: #bd5f42;
  --accent-soft: rgba(221,121,88,0.16);
  --line: rgba(32,59,67,0.06);
  --ok: #2f8f63;
  --max: 1180px;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body {
  margin: 0;
  color: var(--text);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px),
    linear-gradient(180deg, #fcfaf7 0%, #f8f4ef 100%);
  background-size: 82px 82px, 82px 82px, auto;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button, input { font: inherit; }
.container { width: min(var(--max), calc(100% - 40px)); margin: 0 auto; }
.topbar { position: sticky; top: 0; z-index: 10; border-bottom: 1px solid rgba(32,59,67,0.08); background: rgba(252,250,247,0.92); backdrop-filter: blur(8px); }
.topbar-inner { min-height: 92px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.brand { display: inline-flex; align-items: center; }
.brand-logo { display: block; width: min(260px, 42vw); height: auto; }
.topnav { display: flex; align-items: center; gap: 16px; color: var(--muted); font-weight: 700; }
.topnav a, .link-button { border: 0; background: transparent; color: var(--muted); cursor: pointer; font-weight: 700; padding: 8px 0; }
.topnav a:hover, .link-button:hover { color: var(--accent); }
.setup-screen { min-height: calc(100vh - 92px); display: grid; place-items: center; padding: 42px 0; }
.setup-card { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 32px; align-items: center; padding: 42px; border: 1px solid var(--border); border-radius: 34px; background: var(--surface); box-shadow: 0 18px 42px rgba(32,59,67,0.08); backdrop-filter: blur(10px); }
.eyebrow { display: inline-block; margin-bottom: 16px; color: #91a3ab; font-size: 0.82rem; font-weight: 700; letter-spacing: 0.18em; text-transform: uppercase; }
h1, h2, h3 { font-family: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif; letter-spacing: -0.045em; font-weight: 500; }
h1 { margin: 0; font-size: clamp(2.6rem, 6vw, 5.3rem); line-height: 0.96; }
.setup-card p, .course-hero p, .module-list-header p, .lesson-card p, .completion-card p { color: var(--muted); line-height: 1.6; }
.username-form { display: grid; gap: 14px; padding: 24px; border-radius: 24px; background: #fff; border: 1px solid rgba(32,59,67,0.08); }
.username-form label { font-weight: 800; }
input { width: 100%; border: 1px solid rgba(32,59,67,0.12); border-radius: 16px; padding: 15px 16px; color: var(--text); background: #fff; outline: none; }
input:focus { border-color: var(--accent); box-shadow: 0 0 0 4px rgba(221,121,88,0.12); }
.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 52px; border-radius: 999px; padding: 14px 24px; font-size: 1rem; font-weight: 800; transition: transform .18s ease, background .18s ease, border-color .18s ease; cursor: pointer; }
.btn:hover { transform: translateY(-2px); }
.btn-primary { border: 0; background: var(--text); color: #fff; box-shadow: 0 16px 32px rgba(32,59,67,0.12); }
.btn-primary:hover { background: #152d34; }
.btn-secondary { background: rgba(255,255,255,0.72); color: var(--text); border: 1px solid rgba(32,59,67,0.14); }
.btn-secondary:hover { border-color: var(--accent); }
.microcopy { margin: 0; font-size: 0.9rem; }
.course-shell { padding: 42px 0 70px; }
.course-hero { display: grid; grid-template-columns: minmax(0, 1fr) 310px; gap: 24px; align-items: stretch; }
.hero-copy-block, .progress-card, .module-list, .lesson-player, .completion-card, .reminder-strip { border: 1px solid var(--border); border-radius: 28px; background: var(--surface); box-shadow: 0 18px 42px rgba(32,59,67,0.08); backdrop-filter: blur(10px); }
.hero-copy-block { padding: 34px; }
.hero-copy-block h1 { max-width: 12ch; }
.hero-copy-block h1 span { color: var(--accent); }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 26px; }
.progress-card { padding: 28px; display: flex; flex-direction: column; justify-content: center; }
.welcome { margin: 0; color: var(--muted); font-weight: 800; }
.progress-number { margin-top: 8px; font-family: 'Space Grotesk', sans-serif; font-size: 4rem; line-height: 1; color: var(--accent); letter-spacing: -0.06em; }
.progress-track { height: 12px; margin: 18px 0 12px; border-radius: 999px; background: rgba(32,59,67,0.09); overflow: hidden; }
.progress-track div { width: 0%; height: 100%; border-radius: inherit; background: linear-gradient(90deg, var(--accent), #f3a36c); transition: width .22s ease; }
.reminder-strip { margin: 22px 0; padding: 16px 20px; display: flex; flex-wrap: wrap; gap: 10px 16px; color: var(--muted); }
.reminder-strip strong { color: var(--text); }
.completion-card { margin-bottom: 22px; padding: 24px; display: grid; grid-template-columns: auto 1fr; gap: 18px; align-items: center; background: linear-gradient(135deg, rgba(221,121,88,0.2), rgba(255,255,255,0.9)); }
.certificate-mark { width: 68px; height: 68px; display: grid; place-items: center; border-radius: 50%; background: var(--ok); color: #fff; font-size: 2rem; font-weight: 800; }
.completion-card h2 { margin: 0; font-size: clamp(2rem, 4vw, 3.2rem); }
.completion-card p { margin: 4px 0; }
.content-grid { display: grid; grid-template-columns: 360px minmax(0, 1fr); gap: 24px; align-items: start; }
.module-list { padding: 22px; position: sticky; top: 114px; }
.module-list-header h2 { margin: 0 0 6px; font-size: 2rem; }
.module-list-header p { margin: 0 0 18px; }
.module-button { width: 100%; border: 1px solid rgba(32,59,67,0.09); background: rgba(255,255,255,0.72); color: var(--text); text-align: left; border-radius: 18px; padding: 15px; margin-bottom: 10px; cursor: pointer; transition: border-color .18s ease, transform .18s ease, background .18s ease; }
.module-button:hover, .module-button.active { border-color: var(--accent); background: #fff; transform: translateY(-1px); }
.module-button.complete { border-color: rgba(47,143,99,0.35); }
.module-kicker { display: flex; justify-content: space-between; align-items: center; gap: 10px; color: var(--muted); font-size: 0.78rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.module-title { display: block; margin-top: 7px; font-weight: 800; line-height: 1.25; }
.module-meta { display: block; margin-top: 8px; color: var(--muted); font-size: 0.84rem; line-height: 1.45; }
.check-pill { color: var(--ok); font-weight: 900; }
.lesson-player { min-height: 520px; padding: 30px; }
.lesson-card h2 { margin: 0; font-size: clamp(2rem, 4vw, 3.7rem); line-height: 1; }
.lesson-goal, .outcome-card { margin: 14px 0 18px; padding: 16px; border-radius: 18px; background: var(--accent-soft); color: var(--text); line-height: 1.6; }
.outcome-card { background: rgba(47,143,99,0.11); border: 1px solid rgba(47,143,99,0.18); }
.lesson-section { margin-top: 28px; }
.lesson-section h3 { margin: 0 0 12px; font-size: 1.25rem; }
.lesson-section h4 { margin: 0 0 8px; font-size: 1rem; }
.lesson-section p { margin: 0; color: var(--muted); line-height: 1.75; }
.lesson-section ul, .lesson-section ol { margin: 0; padding-left: 20px; color: var(--muted); line-height: 1.7; }
.lesson-stack, .prompt-grid { display: grid; gap: 14px; }
.mini-lesson, .prompt-card { padding: 18px; border-radius: 20px; background: rgba(255,255,255,0.78); border: 1px solid rgba(32,59,67,0.08); }
.prompt-card pre { margin: 12px 0 0; white-space: pre-wrap; overflow-wrap: anywhere; color: #24444d; background: #fffaf5; border: 1px solid rgba(221,121,88,0.16); border-radius: 16px; padding: 14px; font-size: 0.92rem; line-height: 1.58; }
.assignment-box, .share-box { margin-top: 26px; padding: 20px; border-radius: 22px; background: var(--surface-strong); border: 1px solid rgba(221,121,88,0.18); }
.share-box { background: rgba(47,143,99,0.08); border-color: rgba(47,143,99,0.18); }
.assignment-box h3, .share-box h3 { margin: 0 0 8px; }
.assignment-box p, .share-box p { margin: 0; }
.player-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 26px; }
.player-empty { color: var(--muted); }
.footer { border-top: 1px solid rgba(32,59,67,0.08); background: rgba(252,250,247,0.92); backdrop-filter: blur(8px); }
.footer-row { min-height: 92px; display: flex; justify-content: space-between; gap: 18px; align-items: center; }
.footer-copy, .footer-email { color: var(--muted); font-size: 0.95rem; }
@media (max-width: 920px) {
  body { background-size: 56px 56px, 56px 56px, auto; }
  .setup-card, .course-hero, .content-grid { grid-template-columns: 1fr; }
  .module-list { position: static; }
  .hero-copy-block h1 { max-width: 13ch; }
}
@media (max-width: 640px) {
  .container { width: min(var(--max), calc(100% - 24px)); }
  .topbar-inner { min-height: 82px; align-items: flex-start; flex-direction: column; justify-content: center; padding: 14px 0; }
  .brand-logo { width: 220px; }
  .topnav { width: 100%; justify-content: space-between; font-size: 0.9rem; }
  .setup-card, .hero-copy-block, .progress-card, .lesson-player, .completion-card { padding: 22px; border-radius: 24px; }
  h1 { font-size: clamp(2.6rem, 13vw, 4rem); }
  .hero-actions, .player-actions { flex-direction: column; }
  .btn { width: 100%; }
  .progress-number { font-size: 3.3rem; }
  .completion-card { grid-template-columns: 1fr; }
  .reminder-strip { display: grid; }
  .footer-row { min-height: auto; flex-direction: column; align-items: flex-start; padding: 20px 0; }
}