/* ============================================================
   Claude Mastery — design system
   Warm "Anthropic-ish" palette, dependency-free.
   ============================================================ */
:root {
  --clay: #d97757;
  --clay-dark: #c25f3f;
  --clay-soft: #f4d9cd;
  --ink: #1d1b17;
  --ink-2: #4a463f;
  --ink-3: #6f6a60;
  --cream: #faf7f2;
  --cream-2: #f3ede3;
  --paper: #ffffff;
  --line: #e6ded2;
  --line-2: #d8cdbd;
  --ok: #3f7d58;
  --ok-soft: #e2efe6;
  --warn: #b5852a;
  --warn-soft: #f7eed6;
  --info: #4a6b8a;
  --info-soft: #e3edf4;
  --danger: #b3402f;
  --adv: #6b4a8a;
  --adv-soft: #ece3f4;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 1px 2px rgba(40,30,20,.05), 0 8px 24px rgba(40,30,20,.06);
  --shadow-lg: 0 12px 40px rgba(40,30,20,.12);
  --sidebar-w: 312px;
  --maxw: 880px;
  --serif: "Fraunces", Georgia, "Times New Roman", serif;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--cream);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4 { font-family: var(--serif); font-weight: 600; line-height: 1.18; color: var(--ink); letter-spacing: -.01em; }
a { color: var(--clay-dark); }
code { font-family: var(--mono); font-size: .88em; background: var(--cream-2); padding: .12em .4em; border-radius: 5px; border: 1px solid var(--line); }
.skip-link { position: absolute; left: -999px; top: 0; background: var(--ink); color: #fff; padding: 10px 16px; border-radius: 0 0 8px 0; z-index: 100; }
.skip-link:focus { left: 0; }

/* ---------- Layout ---------- */
.layout { display: flex; min-height: 100vh; }
.content { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.view { flex: 1; padding: 48px clamp(20px, 5vw, 72px) 24px; max-width: calc(var(--maxw) + 144px); width: 100%; margin: 0 auto; }

/* ---------- Topbar (mobile) ---------- */
.topbar { display: none; align-items: center; gap: 12px; padding: 10px 14px; background: var(--paper); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 40; }
.topbar__menu { font-size: 20px; background: none; border: none; cursor: pointer; color: var(--ink); padding: 4px 8px; }
.topbar__brand { font-family: var(--serif); font-weight: 600; }
.topbar__spacer { flex: 1; }

/* ---------- Sidebar ---------- */
.sidebar { width: var(--sidebar-w); flex: 0 0 var(--sidebar-w); background: var(--paper); border-right: 1px solid var(--line); height: 100vh; position: sticky; top: 0; display: flex; flex-direction: column; overflow-y: auto; }
.brand { display: flex; align-items: center; gap: 12px; padding: 22px 22px 14px; }
.brand__mark { width: 42px; height: 42px; border-radius: 12px; overflow: hidden; box-shadow: var(--shadow); flex: 0 0 42px; }
.brand__mark svg { width: 100%; height: 100%; display: block; }
.brand__title { display: block; font-family: var(--serif); font-weight: 600; font-size: 18px; }
.brand__sub { display: block; font-size: 12px; color: var(--ink-3); letter-spacing: .02em; }

.track { padding: 8px 22px 16px; border-bottom: 1px solid var(--line); }
.track__label { font-size: 11px; text-transform: uppercase; letter-spacing: .08em; color: var(--ink-3); font-weight: 600; }
.track__switch { display: flex; gap: 4px; margin-top: 8px; background: var(--cream-2); padding: 4px; border-radius: 11px; }
.track__btn { flex: 1; border: none; background: transparent; padding: 8px 6px; border-radius: 8px; font-size: 12.5px; font-weight: 600; color: var(--ink-2); cursor: pointer; font-family: var(--sans); transition: .15s; }
.track__btn.is-active { background: var(--paper); color: var(--clay-dark); box-shadow: var(--shadow); }
.track__hint { font-size: 11.5px; color: var(--ink-3); margin: 9px 2px 0; line-height: 1.45; }

.progress-mini { padding: 14px 22px; border-bottom: 1px solid var(--line); }
.progress-mini__bar { height: 8px; background: var(--cream-2); border-radius: 99px; overflow: hidden; }
.progress-mini__bar span { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--clay), var(--clay-dark)); border-radius: 99px; transition: width .4s ease; }
.progress-mini__label { display: block; font-size: 11.5px; color: var(--ink-3); margin-top: 7px; }

.nav { padding: 10px 12px 16px; flex: 1; }
.nav__part { margin-top: 14px; }
.nav__part-title { font-size: 11px; text-transform: uppercase; letter-spacing: .07em; color: var(--clay-dark); font-weight: 700; padding: 6px 10px; }
.nav__item { display: flex; align-items: center; gap: 9px; width: 100%; text-align: left; border: none; background: none; padding: 8px 10px; border-radius: 9px; cursor: pointer; color: var(--ink-2); font-size: 13.5px; font-family: var(--sans); line-height: 1.3; transition: background .12s; }
.nav__item:hover { background: var(--cream-2); }
.nav__item.is-active { background: var(--clay-soft); color: var(--ink); font-weight: 600; }
.nav__check { flex: 0 0 18px; width: 18px; height: 18px; border-radius: 50%; border: 1.5px solid var(--line-2); display: grid; place-items: center; font-size: 11px; color: transparent; }
.nav__item.is-done .nav__check { background: var(--ok); border-color: var(--ok); color: #fff; }
.nav__item.is-progress .nav__check { border-color: var(--clay); color: transparent; position: relative; }
.nav__item.is-progress .nav__check::after { content: ""; position: absolute; inset: 4px; border-radius: 50%; background: var(--clay); }
.nav__item.is-progress .nav__label { color: var(--ink); }
.nav__item.is-exam .nav__num { color: var(--adv); }
.nav__num { flex: 0 0 auto; font-variant-numeric: tabular-nums; font-size: 11px; color: var(--ink-3); width: 26px; }
.nav__label { flex: 1; }

.sidebar__foot { padding: 14px 18px 22px; border-top: 1px solid var(--line); display: flex; flex-direction: column; gap: 4px; }
.linkbtn { background: none; border: none; text-align: left; color: var(--ink-3); font-size: 12.5px; cursor: pointer; padding: 5px 4px; font-family: var(--sans); border-radius: 6px; }
.linkbtn:hover { color: var(--ink); background: var(--cream-2); }
.linkbtn--danger:hover { color: var(--danger); }

.scrim { display: none; }

/* ---------- Generic UI ---------- */
.btn { display: inline-flex; align-items: center; gap: 8px; background: var(--clay); color: #fff; border: none; padding: 11px 20px; border-radius: 10px; font-weight: 600; font-size: 14.5px; cursor: pointer; font-family: var(--sans); box-shadow: var(--shadow); transition: .15s; text-decoration: none; }
.btn:hover { background: var(--clay-dark); transform: translateY(-1px); }
.btn--ghost { background: var(--paper); color: var(--ink); border: 1px solid var(--line-2); box-shadow: none; }
.btn--ghost:hover { background: var(--cream-2); }
.btn--sm { padding: 8px 14px; font-size: 13px; }
.pill { display: inline-flex; align-items: center; gap: 5px; font-size: 11.5px; font-weight: 600; padding: 3px 10px; border-radius: 99px; background: var(--cream-2); color: var(--ink-2); border: 1px solid var(--line); }
.pill--adv { background: var(--adv-soft); color: var(--adv); border-color: transparent; }
.pill--core { background: var(--clay-soft); color: var(--clay-dark); border-color: transparent; }
.pill--time { background: var(--info-soft); color: var(--info); border-color: transparent; }

/* ---------- Hero / dashboard ---------- */
.hero { background: linear-gradient(160deg, #fff, var(--cream-2)); border: 1px solid var(--line); border-radius: 20px; padding: 40px clamp(24px,4vw,48px); box-shadow: var(--shadow); position: relative; overflow: hidden; }
.hero::after { content: ""; position: absolute; right: -60px; top: -60px; width: 240px; height: 240px; background: radial-gradient(circle, var(--clay-soft), transparent 70%); opacity: .7; }
.hero__eyebrow { color: var(--clay-dark); font-weight: 700; font-size: 12.5px; letter-spacing: .08em; text-transform: uppercase; }
.hero h1 { font-size: clamp(28px, 4vw, 44px); margin: 10px 0 14px; max-width: 18ch; }
.hero p { font-size: 17px; color: var(--ink-2); max-width: 56ch; margin: 0 0 22px; }
.hero__actions { display: flex; gap: 12px; flex-wrap: wrap; }
.hero__stats { display: flex; gap: 26px; margin-top: 28px; flex-wrap: wrap; }
.hero__stat b { font-family: var(--serif); font-size: 26px; display: block; }
.hero__stat span { font-size: 12.5px; color: var(--ink-3); }

.section-title { font-size: 22px; margin: 40px 0 6px; }
.section-sub { color: var(--ink-3); margin: 0 0 20px; font-size: 14.5px; }

.parts-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px,1fr)); gap: 16px; }
.partcard { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); display: flex; flex-direction: column; }
.partcard__no { font-family: var(--serif); color: var(--clay); font-size: 14px; font-weight: 700; }
.partcard h3 { font-size: 18px; margin: 4px 0 6px; }
.partcard p { font-size: 13.5px; color: var(--ink-2); margin: 0 0 14px; flex: 1; }
.partcard__meta { font-size: 12px; color: var(--ink-3); display: flex; justify-content: space-between; align-items: center; }
.partcard__bar { height: 6px; background: var(--cream-2); border-radius: 99px; margin-top: 10px; overflow: hidden; }
.partcard__bar span { display: block; height: 100%; background: var(--clay); border-radius: 99px; }

/* ---------- Module page ---------- */
.crumbs { font-size: 12.5px; color: var(--ink-3); margin-bottom: 14px; }
.crumbs a { color: var(--ink-3); text-decoration: none; }
.crumbs a:hover { color: var(--clay-dark); }
.mod-head h1 { font-size: clamp(26px, 3.4vw, 36px); margin: 6px 0 12px; }
.mod-head__meta { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; margin-bottom: 18px; }
.mod-summary { font-size: 17px; color: var(--ink-2); max-width: 60ch; }
.objectives { background: var(--cream-2); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 22px; margin: 22px 0 4px; }
.objectives h4 { margin: 0 0 10px; font-size: 14px; text-transform: uppercase; letter-spacing: .05em; color: var(--ink-3); font-family: var(--sans); font-weight: 700; }
.objectives ul { margin: 0; padding-left: 20px; }
.objectives li { margin: 5px 0; color: var(--ink-2); }

.tabpanel { animation: fade .25s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }

/* ---------- Prose (reading blocks) ---------- */
.prose { max-width: 68ch; }
.prose h2 { font-size: 24px; margin: 34px 0 12px; }
.prose h3 { font-size: 19px; margin: 26px 0 8px; }
.prose p { margin: 0 0 16px; color: var(--ink-2); }
.prose ul, .prose ol { margin: 0 0 16px; padding-left: 24px; color: var(--ink-2); }
.prose li { margin: 6px 0; }
.prose strong { color: var(--ink); }
.prose blockquote { border-left: 3px solid var(--clay); margin: 20px 0; padding: 4px 18px; color: var(--ink-2); font-style: italic; background: var(--cream-2); border-radius: 0 8px 8px 0; }
.prose blockquote cite { display: block; font-style: normal; font-size: 13px; color: var(--ink-3); margin-top: 6px; }

.callout { border-radius: var(--radius); padding: 16px 18px; margin: 20px 0; border: 1px solid; display: flex; gap: 12px; }
.callout__icon { font-size: 18px; flex: 0 0 auto; line-height: 1.4; }
.callout__body { flex: 1; }
.callout__body > *:last-child { margin-bottom: 0; }
.callout__title { font-weight: 700; margin: 0 0 4px; font-family: var(--sans); font-size: 14.5px; }
.callout--tip { background: var(--ok-soft); border-color: #c7e0cf; }
.callout--tip .callout__title { color: var(--ok); }
.callout--warning { background: var(--warn-soft); border-color: #ecdcb0; }
.callout--warning .callout__title { color: var(--warn); }
.callout--note { background: var(--info-soft); border-color: #cfe0ec; }
.callout--note .callout__title { color: var(--info); }
.callout--key { background: var(--clay-soft); border-color: #ecc6b6; }
.callout--key .callout__title { color: var(--clay-dark); }

.steps { counter-reset: step; list-style: none; padding: 0; margin: 20px 0; }
.steps li { counter-increment: step; position: relative; padding: 4px 0 16px 44px; border-left: 2px solid var(--line); margin-left: 14px; }
.steps li:last-child { border-left-color: transparent; padding-bottom: 0; }
.steps li::before { content: counter(step); position: absolute; left: -15px; top: 0; width: 28px; height: 28px; background: var(--clay); color: #fff; border-radius: 50%; display: grid; place-items: center; font-size: 13px; font-weight: 700; font-family: var(--sans); }

.table-wrap { overflow-x: auto; margin: 20px 0; border: 1px solid var(--line); border-radius: var(--radius); }
table.data { border-collapse: collapse; width: 100%; font-size: 14px; }
table.data th, table.data td { text-align: left; padding: 11px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
table.data th { background: var(--cream-2); font-family: var(--sans); font-weight: 700; color: var(--ink); }
table.data tr:last-child td { border-bottom: none; }

.codeblock { background: #2a2622; color: #f4ede3; border-radius: var(--radius); padding: 16px 18px; overflow-x: auto; font-family: var(--mono); font-size: 13px; line-height: 1.6; margin: 18px 0; }
.codeblock .cmt { color: #b6a892; }

/* ---------- Video tab ---------- */
.video-card { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.video-stage { aspect-ratio: 16/9; background: linear-gradient(135deg, #2a2622, #4a3d34); color: #fff; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 14px; text-align: center; padding: 24px; position: relative; }
.video-stage__play { width: 64px; height: 64px; border-radius: 50%; background: var(--clay); display: grid; place-items: center; font-size: 24px; box-shadow: var(--shadow-lg); }
.video-stage h3 { color: #fff; margin: 0; max-width: 28ch; }
.video-stage p { color: #e8dccf; font-size: 13px; margin: 0; }
.video-meta { padding: 16px 20px; display: flex; gap: 10px; flex-wrap: wrap; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); }
.slide-list { padding: 6px 8px 10px; }
.slide-row { display: flex; gap: 12px; padding: 12px; border-radius: 10px; }
.slide-row:hover { background: var(--cream-2); }
.slide-row__no { font-family: var(--serif); color: var(--clay); font-weight: 700; flex: 0 0 34px; font-size: 14px; }
.slide-row__body h4 { margin: 0 0 4px; font-size: 15px; font-family: var(--sans); }
.slide-row__body ul { margin: 4px 0 8px; padding-left: 18px; font-size: 13px; color: var(--ink-2); }
.slide-row__notes { font-size: 12.5px; color: var(--ink-3); background: var(--cream-2); border-radius: 8px; padding: 8px 11px; border-left: 2px solid var(--line-2); }
.slide-row__notes b { color: var(--ink-2); }

/* ---------- Lesson plan ---------- */
.lp-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px,1fr)); gap: 12px; margin: 18px 0; }
.lp-stat { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 14px; }
.lp-stat span { font-size: 11.5px; color: var(--ink-3); text-transform: uppercase; letter-spacing: .04em; font-weight: 600; }
.lp-stat b { display: block; margin-top: 4px; font-size: 15px; }
.lp-sequence { margin: 16px 0; }
.lp-phase { display: grid; grid-template-columns: 88px 1fr; gap: 14px; padding: 14px 0; border-bottom: 1px solid var(--line); }
.lp-phase__time { font-family: var(--mono); font-size: 12.5px; color: var(--clay-dark); font-weight: 600; }
.lp-phase__name { font-weight: 700; font-size: 14.5px; margin-bottom: 3px; }
.lp-phase__act { font-size: 13.5px; color: var(--ink-2); }
.lp-diff { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 16px; }
@media (max-width: 640px){ .lp-diff { grid-template-columns: 1fr; } }
.lp-diff__col { border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; }
.lp-diff__col h4 { margin: 0 0 8px; }
.lp-diff__col--exp { border-color: var(--adv-soft); background: var(--adv-soft); }

/* ---------- Tasks ---------- */
.task { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px 22px; margin: 16px 0; box-shadow: var(--shadow); }
.task__head { display: flex; align-items: flex-start; gap: 12px; }
.task__check { flex: 0 0 24px; width: 24px; height: 24px; border-radius: 7px; border: 2px solid var(--line-2); background: var(--paper); cursor: pointer; display: grid; place-items: center; color: transparent; font-size: 14px; margin-top: 2px; }
.task.is-done .task__check { background: var(--ok); border-color: var(--ok); color: #fff; }
.task__title { flex: 1; }
.task__title h4 { margin: 0; font-size: 17px; font-family: var(--sans); }
.task__title .task__meta { display: flex; gap: 8px; margin-top: 6px; flex-wrap: wrap; }
.task__body { margin-top: 14px; padding-left: 36px; }
.task__body h5 { margin: 14px 0 6px; font-size: 12.5px; text-transform: uppercase; letter-spacing: .04em; color: var(--ink-3); font-family: var(--sans); }
.task__body ul, .task__body ol { margin: 0; padding-left: 20px; color: var(--ink-2); font-size: 14px; }
.task__body li { margin: 5px 0; }
.task__deliverable { background: var(--cream-2); border-radius: 9px; padding: 10px 14px; font-size: 13.5px; margin-top: 12px; }

/* ---------- Quiz / Exam ---------- */
.quiz-intro { background: var(--cream-2); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 22px; margin-bottom: 20px; }
.q { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px 22px; margin: 14px 0; box-shadow: var(--shadow); }
.q__num { font-size: 12px; color: var(--clay-dark); font-weight: 700; letter-spacing: .04em; }
.q__text { font-size: 16.5px; font-weight: 600; margin: 4px 0 14px; }
.q__opts { display: flex; flex-direction: column; gap: 8px; }
.opt { display: flex; gap: 11px; align-items: flex-start; padding: 12px 14px; border: 1.5px solid var(--line); border-radius: 10px; cursor: pointer; transition: .12s; background: var(--paper); }
.opt:hover { border-color: var(--line-2); background: var(--cream); }
.opt input { margin-top: 3px; accent-color: var(--clay); }
.opt.is-correct { border-color: var(--ok); background: var(--ok-soft); }
.opt.is-wrong { border-color: var(--danger); background: #f7e3df; }
.opt__letter { font-weight: 700; color: var(--ink-3); flex: 0 0 auto; }
.q__explain { margin-top: 12px; font-size: 13.5px; background: var(--info-soft); border-left: 3px solid var(--info); border-radius: 0 8px 8px 0; padding: 10px 14px; display: none; }
.q.is-graded .q__explain { display: block; }
.quiz-actions { display: flex; gap: 12px; align-items: center; margin: 22px 0; flex-wrap: wrap; }
.score-banner { border-radius: var(--radius); padding: 20px 24px; margin: 18px 0; display: flex; align-items: center; gap: 18px; }
.score-banner--pass { background: var(--ok-soft); border: 1px solid #c7e0cf; }
.score-banner--fail { background: var(--warn-soft); border: 1px solid #ecdcb0; }
.score-banner__big { font-family: var(--serif); font-size: 40px; font-weight: 700; }
.score-banner--pass .score-banner__big { color: var(--ok); }
.score-banner--fail .score-banner__big { color: var(--warn); }

/* ---------- Certificate ---------- */
.cert { border: 3px double var(--clay); border-radius: 18px; padding: 44px; text-align: center; background: linear-gradient(160deg, #fff, var(--cream-2)); margin: 24px 0; }
.cert__seal { font-size: 46px; }
.cert h2 { font-size: 30px; margin: 10px 0; }
.cert__name { font-family: var(--serif); font-size: 26px; color: var(--clay-dark); border-bottom: 2px solid var(--line-2); display: inline-block; padding: 4px 30px; margin: 14px 0; min-width: 260px; }

/* ---------- Pager ---------- */
.pager { display: flex; justify-content: space-between; gap: 12px; margin: 40px 0 10px; }
.pager a { flex: 1; border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 18px; text-decoration: none; color: var(--ink); background: var(--paper); transition: .15s; }
.pager a:hover { border-color: var(--clay); box-shadow: var(--shadow); }
.pager a span { display: block; font-size: 11.5px; color: var(--ink-3); }
.pager a b { font-size: 14.5px; font-family: var(--sans); }
.pager a.next { text-align: right; }
.pager a.disabled { opacity: .4; pointer-events: none; }

/* ---------- Footer ---------- */
.footer { padding: 26px clamp(20px,5vw,72px); color: var(--ink-3); font-size: 12.5px; border-top: 1px solid var(--line); display: flex; gap: 10px; align-items: center; flex-wrap: wrap; max-width: calc(var(--maxw) + 144px); margin: 0 auto; width: 100%; }
.footer__dot { opacity: .5; }
.footer code { font-size: 11.5px; }

.hidden { display: none !important; }

/* ---------- Sidebar quick links ---------- */
.quicklinks { padding: 12px 16px 4px; display: flex; flex-direction: column; gap: 6px; border-bottom: 1px solid var(--line); }
.quicklink { display: flex; align-items: center; gap: 9px; width: 100%; text-align: left; border: 1px solid var(--line); background: var(--paper); padding: 9px 12px; border-radius: 10px; cursor: pointer; font-size: 13px; font-weight: 600; color: var(--ink-2); font-family: var(--sans); transition: .12s; }
.quicklink:hover { background: var(--cream-2); border-color: var(--line-2); }
.quicklink span { font-size: 15px; }
.quicklink--adv { background: var(--adv-soft); border-color: transparent; color: var(--adv); }
.quicklink--adv:hover { background: #e2d5f0; }
.powered { margin-top: 8px; font-size: 11px; color: var(--ink-3); }
.powered b { color: var(--clay-dark); font-weight: 700; }

/* ---------- Module utility bar ---------- */
.mod-util { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin: 18px 0 6px; }
.mod-util__note { font-size: 12px; color: var(--adv); background: var(--adv-soft); padding: 4px 10px; border-radius: 99px; font-weight: 600; }

/* ---------- Step tracker ---------- */
.stepper { display: flex; align-items: center; margin: 26px 0 22px; padding: 4px 0; overflow-x: auto; }
.step { display: flex; align-items: center; gap: 8px; border: none; background: none; cursor: pointer; padding: 6px 8px; border-radius: 10px; font-family: var(--sans); flex: 0 0 auto; }
.step:hover { background: var(--cream-2); }
.step__dot { width: 30px; height: 30px; border-radius: 50%; display: grid; place-items: center; background: var(--cream-2); border: 2px solid var(--line-2); font-size: 14px; color: var(--ink-3); transition: .15s; }
.step__label { font-size: 13.5px; font-weight: 600; color: var(--ink-3); }
.step.is-active .step__dot { background: var(--clay); border-color: var(--clay); color: #fff; box-shadow: 0 0 0 4px var(--clay-soft); }
.step.is-active .step__label { color: var(--ink); }
.step.is-past .step__dot { background: var(--ok); border-color: var(--ok); color: #fff; }
.step.is-past .step__label { color: var(--ink-2); }
.step__line { flex: 1 1 18px; min-width: 14px; height: 2px; background: var(--line-2); margin: 0 2px; }
.step__line.is-past { background: var(--ok); }

/* ---------- Step pager ---------- */
.steppager { display: flex; justify-content: space-between; gap: 12px; margin: 30px 0 8px; padding-top: 20px; border-top: 1px solid var(--line); }
.btn.is-disabled { opacity: .4; pointer-events: none; }

/* ---------- Locked / AI+ teaser cards ---------- */
.locked-card { display: flex; gap: 14px; align-items: flex-start; margin: 20px 0 4px; padding: 16px 18px; border: 1.5px dashed var(--adv); border-radius: var(--radius); background: var(--adv-soft); cursor: pointer; transition: .15s; }
.locked-card:hover { transform: translateY(-1px); box-shadow: var(--shadow); }
.locked-card__lock { font-size: 22px; }
.locked-card__title { font-weight: 700; color: var(--adv); font-family: var(--sans); }
.locked-card p { margin: 3px 0 0; font-size: 13.5px; color: var(--ink-2); }

/* ---------- AI+ page ---------- */
.hero--adv { background: linear-gradient(160deg, #fff, var(--adv-soft)); }
.hero--adv::after { background: radial-gradient(circle, #d9c6ee, transparent 70%); }
.adv-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 16px; }
.adv-card { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow); }
.adv-card h3 { font-size: 18px; margin: 4px 0 6px; }
.adv-card > p { font-size: 13.5px; color: var(--ink-2); margin: 0 0 14px; }
.adv-card__list { list-style: none; margin: 0; padding: 0; }
.adv-card__list li { font-size: 13.5px; color: var(--ink-2); padding: 7px 0; border-top: 1px solid var(--line); }
.adv-mod { display: flex; align-items: center; gap: 9px; cursor: pointer; border-radius: 8px; margin: 0 -8px; padding: 8px !important; transition: background .12s; }
.adv-mod:hover { background: var(--adv-soft); }
.adv-mod__ico { flex: 0 0 20px; width: 20px; height: 20px; border-radius: 50%; display: grid; place-items: center; background: var(--adv-soft); color: var(--adv); font-size: 11px; font-weight: 700; }
.adv-mod.is-done .adv-mod__ico { background: var(--ok); color: #fff; }
.adv-mod--exam { color: var(--adv); font-weight: 600; }
.adv-final { margin: 18px 0 0; padding: 16px 20px; border-radius: var(--radius); background: var(--adv); color: #fff; font-weight: 600; cursor: pointer; text-align: center; transition: .15s; }
.adv-final:hover { background: #5a3d78; }
.adv-cta { margin: 30px 0 10px; padding: 28px; text-align: center; border: 1px solid var(--adv); border-radius: 20px; background: var(--adv-soft); }
.adv-cta h3 { font-size: 22px; margin: 0 0 8px; }
.adv-cta p { color: var(--ink-2); max-width: 52ch; margin: 0 auto 16px; }

/* ---------- AI+ purchase & license redemption ---------- */
.btn--lg { padding: 14px 28px; font-size: 16px; }
.buy-price { font-family: var(--serif); font-size: 40px; font-weight: 700; color: var(--adv); margin: 6px 0 14px; }
.buy-price span { font-family: var(--sans); font-size: 13px; font-weight: 600; color: var(--ink-3); display: block; letter-spacing: .02em; }
.buy-note { font-size: 12.5px; color: var(--ink-3); margin-top: 12px !important; }
.buy-error { margin-top: 12px !important; color: var(--danger); font-weight: 600; font-size: 13.5px; }
.redeem { margin-top: 22px; padding-top: 18px; border-top: 1px dashed var(--adv); display: flex; gap: 8px; flex-wrap: wrap; justify-content: center; align-items: center; }
.redeem__label { width: 100%; margin: 0 0 4px !important; font-size: 13px; font-weight: 600; color: var(--ink-2); }
.redeem__input { border: 1.5px solid var(--line-2); border-radius: 10px; padding: 10px 14px; font-family: var(--mono); font-size: 13.5px; width: min(320px, 80vw); text-transform: uppercase; }
.redeem__input:focus { outline: none; border-color: var(--adv); }
.adv-mod.is-locked { cursor: default; opacity: .75; }
.adv-mod.is-locked:hover { background: none; }
.keycard { background: var(--paper); border: 2px solid var(--adv); border-radius: var(--radius); padding: 22px; text-align: center; max-width: 480px; }
.keycard__label { font-size: 13px; color: var(--ink-3); margin: 0 0 10px; }
.keycard__key { font-family: var(--mono); font-size: 20px; font-weight: 700; letter-spacing: 1px; background: var(--adv-soft); color: var(--adv); border-radius: 10px; padding: 14px; user-select: all; }
.keycard__mail { font-size: 13px; color: var(--ink-2); margin: 12px 0 0; }

/* ---------- account / login ---------- */
.acct-card { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px 24px; box-shadow: var(--shadow); max-width: 580px; }
.acct-card h3 { font-size: 19px; margin: 0 0 10px; }
.acct-row { margin: 9px 0; font-size: 15px; color: var(--ink-2); }
.acct-row.muted { color: var(--ink-3); font-size: 13.5px; }
.acct-err { color: var(--danger); font-weight: 600; font-size: 13.5px; margin-top: 10px !important; min-height: 1em; }

/* ---------- Lesson-plan accordions ---------- */
.lp-part { margin-bottom: 8px; }
.lp-acc { border: 1px solid var(--line); border-radius: var(--radius); margin: 8px 0; background: var(--paper); overflow: hidden; }
.lp-acc > summary { cursor: pointer; padding: 14px 18px; font-weight: 600; font-family: var(--serif); font-size: 16px; }
.lp-acc[open] > summary { border-bottom: 1px solid var(--line); background: var(--cream-2); }
.lp-acc__body { padding: 8px 18px 18px; }

/* ============================================================
   Claudia video player
   ============================================================ */
.cvid { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.cvid__stage { aspect-ratio: 16/9; position: relative; overflow: hidden; color: #fff;
  background: radial-gradient(120% 140% at 85% -10%, #5a4636 0%, #3a3028 45%, #262019 100%); }
.cvid__slide { position: absolute; inset: 0; padding: clamp(18px, 5%, 48px) clamp(18px, 6%, 56px); padding-right: clamp(110px, 22%, 190px); }
.cvid__kicker { font-size: clamp(9px, 1.4vw, 12px); letter-spacing: .12em; text-transform: uppercase; color: #e8b39a; font-weight: 700; margin-bottom: .8em; }
.cvid__title { font-family: var(--serif); font-size: clamp(18px, 3.6vw, 34px); color: #fff; margin: 0 0 .55em; line-height: 1.15; max-width: 22ch; }
.cvid__bullets { list-style: none; margin: 0; padding: 0; font-size: clamp(12px, 1.9vw, 17px); color: #f0e6d8; max-width: 52ch; }
.cvid__bullets li { margin: .5em 0; padding-left: 1.2em; position: relative; opacity: 0; animation: cvidIn .5s ease forwards; }
.cvid__bullets li::before { content: "✦"; position: absolute; left: 0; color: var(--clay); }
.cvid__slide--in .cvid__kicker, .cvid__slide--in .cvid__title { animation: cvidIn .45s ease both; }
@keyframes cvidIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }

/* host: the voice orb — pulses with each spoken word */
.cvid__host { position: absolute; right: clamp(10px, 3%, 26px); bottom: clamp(44px, 12%, 64px); text-align: center; }
.cvid__hostname { display: block; margin-top: 6px; font-size: 11px; font-weight: 700; color: #fff; background: rgba(0,0,0,.35); border-radius: 99px; padding: 3px 10px; }
.cvid__hostname em { font-style: normal; font-weight: 500; color: #e8d9c8; display: block; font-size: 9.5px; }
.cvid-orb { position: relative; width: 84px; height: 84px; margin: 0 auto; }
.cvid-orb__breathe { position: absolute; inset: 0; animation: cvidBreathe 3.4s ease-in-out infinite; }
@keyframes cvidBreathe { 0%,100% { transform: scale(1);} 50% { transform: scale(1.05);} }
.cvid-orb__core { position: absolute; inset: 10px; border-radius: 50%;
  background: radial-gradient(circle at 36% 30%, #f0a284 0%, #d97757 45%, #a84a2f 100%);
  box-shadow: 0 0 18px rgba(217,119,87,.45), inset 0 -6px 14px rgba(90,30,10,.35);
  transform: scale(1); transition: transform .12s ease-out; will-change: transform; }
.cvid__host.is-speaking .cvid-orb__core { box-shadow: 0 0 30px rgba(217,119,87,.8), 0 0 64px rgba(217,119,87,.35), inset 0 -6px 14px rgba(90,30,10,.35); }
.cvid-orb__ring { position: absolute; inset: 10px; border-radius: 50%; border: 2px solid rgba(240,162,132,.7); pointer-events: none;
  animation: cvidRing .6s ease-out forwards; }
@keyframes cvidRing { from { transform: scale(1); opacity: .7; } to { transform: scale(2.1); opacity: 0; } }

/* captions */
.cvid__captions { position: absolute; left: 50%; transform: translateX(-50%); bottom: clamp(8px, 3%, 16px); max-width: min(86%, 60ch); background: rgba(0,0,0,.55); border-radius: 9px; padding: 6px 14px; font-size: clamp(11px, 1.8vw, 15px); line-height: 1.45; text-align: center; backdrop-filter: blur(3px); }
.cvid__captions:empty { display: none; }
.cvid-w { opacity: .38; }
.cvid-w-on { opacity: 1; color: #ffd9c7; }

/* big play + controls */
.cvid__bigplay { position: absolute; inset: 0; margin: auto; width: 76px; height: 76px; border-radius: 50%; border: none; background: var(--clay); color: #fff; font-size: 26px; cursor: pointer; box-shadow: var(--shadow-lg); transition: .15s; }
.cvid__bigplay:hover { transform: scale(1.07); background: var(--clay-dark); }
.cvid__bar { display: flex; gap: 4px; padding: 8px 10px 0; }
.cvid__seg { flex: 1; height: 14px; border: none; background: none; cursor: pointer; padding: 4px 0; }
.cvid__seg span { display: block; height: 5px; border-radius: 99px; background: var(--cream-2); transition: background .2s; }
.cvid__seg:hover span { background: var(--line-2); }
.cvid__seg.is-done span { background: var(--clay-soft); }
.cvid__seg.is-now span { background: var(--clay); }
.cvid__controls { display: flex; align-items: center; gap: 8px; padding: 8px 12px 12px; flex-wrap: wrap; }
.cvid__btn { border: 1px solid var(--line); background: var(--paper); border-radius: 8px; width: 34px; height: 30px; cursor: pointer; font-size: 13px; color: var(--ink-2); }
.cvid__btn:hover { background: var(--cream-2); }
.cvid__btn--txt { width: auto; padding: 0 9px; font-weight: 700; font-size: 11px; letter-spacing: .04em; }
.cvid__btn--txt.is-on { background: var(--clay-soft); color: var(--clay-dark); border-color: transparent; }
.cvid__count { font-family: var(--mono); font-size: 12px; color: var(--ink-3); }
.cvid__flex { flex: 1; }
.cvid__silent { font-size: 11px; color: var(--warn); background: var(--warn-soft); border-radius: 99px; padding: 3px 9px; }
.cvid__select { border: 1px solid var(--line); border-radius: 8px; background: var(--paper); font-size: 12px; color: var(--ink-2); padding: 5px 6px; font-family: var(--sans); max-width: 150px; }
.cvid__transcript { margin-top: 18px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--paper); }
.cvid__transcript summary { cursor: pointer; padding: 13px 18px; font-weight: 600; font-size: 14px; color: var(--ink-2); }
.cvid__transcript[open] summary { border-bottom: 1px solid var(--line); }

/* Claudia chip on the hero */
.hero__host { display: inline-flex; align-items: center; gap: 10px; margin-top: 22px; background: var(--paper); border: 1px solid var(--line); border-radius: 99px; padding: 6px 16px 6px 6px; box-shadow: var(--shadow); position: relative; z-index: 1; }
.hero__orb { width: 32px; height: 32px; border-radius: 50%; flex: 0 0 auto;
  background: radial-gradient(circle at 36% 30%, #f0a284 0%, #d97757 45%, #a84a2f 100%);
  box-shadow: 0 0 10px rgba(217,119,87,.4); animation: cvidBreathe 3.4s ease-in-out infinite; }
.hero__host span { font-size: 12.5px; color: var(--ink-2); }
.hero__host b { color: var(--ink); }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .topbar { display: flex; }
  .sidebar { position: fixed; left: 0; top: 0; z-index: 60; transform: translateX(-100%); transition: transform .25s ease; box-shadow: var(--shadow-lg); }
  .sidebar.is-open { transform: translateX(0); }
  .scrim.is-open { display: block; position: fixed; inset: 0; background: rgba(20,15,10,.4); z-index: 50; }
  .view { padding: 28px 20px 16px; }
}
@media print {
  .sidebar, .topbar, .stepper, .steppager, .quiz-actions, .pager, .footer, .video-stage__play { display: none !important; }
  .view { max-width: 100%; }
  .tabpanel { display: block !important; }
}