:root {
  --paper: #FAFAFA; --paper-raised: #FFFFFF; --mist: #E2E8F0; --line: #CBD5E1;
  --ink: #0F172A; --slate: #475569; --on-ink: #FAFAFA; --slate-light: #94A3B8;
  --marigold: #F2B134; --marigold-soft: #FCEFD2; --on-marigold: #0F172A;
  --band: #0F172A; --on-band: #FAFAFA; --band-line: #334155;
  --serif: "Fraunces", Georgia, "Times New Roman", serif;
  --sans: "Inter", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --gutter: 120px; --max: 1200px;
  box-sizing: border-box;
  padding-top: env(safe-area-inset-top, 0px);
  padding-bottom: env(safe-area-inset-bottom, 0px);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #0B1120; --paper-raised: #111A2E; --mist: #1E293B; --line: #334155;
    --ink: #F1F5F9; --slate: #94A3B8; --on-ink: #0F172A; --slate-light: #94A3B8;
    --marigold: #F5BF4F; --marigold-soft: #2A2212;
    --band: #111A2E; --on-band: #F1F5F9; --band-line: #334155;
  }
}
:root[data-theme="dark"] {
  --paper: #0B1120; --paper-raised: #111A2E; --mist: #1E293B; --line: #334155;
  --ink: #F1F5F9; --slate: #94A3B8; --on-ink: #0F172A; --slate-light: #94A3B8;
  --marigold: #F5BF4F; --marigold-soft: #2A2212;
  --band: #111A2E; --on-band: #F1F5F9; --band-line: #334155;
}
html { scroll-padding-top: calc(env(safe-area-inset-top, 0px) + 80px); -webkit-text-size-adjust: 100%; }
*, *::before, *::after { box-sizing: border-box; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--sans); font-size: 16px; line-height: 1.6; }
img { max-width: 100%; display: block; }
a { color: inherit; }
button { font: inherit; }
:focus-visible { outline: 2px solid var(--ink); outline-offset: 2px; }
@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }

/* Type */
.label { margin: 0; font-size: 12px; line-height: 16px; font-weight: 600; letter-spacing: .12em; color: var(--slate); text-transform: none; }
.display { margin: 0; font-family: var(--serif); font-style: italic; font-weight: 400; font-size: clamp(44px, 6vw, 76px); line-height: 1.12; letter-spacing: -.02em; }
.h2 { margin: 0; font-family: var(--serif); font-style: italic; font-weight: 400; font-size: clamp(32px, 4vw, 48px); line-height: 1.16; letter-spacing: -.01em; }
.h3 { margin: 0; font-family: var(--serif); font-style: italic; font-weight: 400; font-size: clamp(26px, 3vw, 32px); line-height: 1.2; }
.lead { margin: 0; font-size: 19px; line-height: 30px; color: var(--slate); max-width: 34em; }
.muted { color: var(--slate); }
.small { font-size: 14px; line-height: 22px; }
.underline-accent { text-decoration: underline; text-decoration-color: var(--marigold); text-decoration-thickness: .13em; text-underline-offset: .15em; text-decoration-skip-ink: none; }

/* Layout */
.wrap { max-width: calc(var(--max) + 2 * var(--gutter)); margin: 0 auto; padding-left: var(--gutter); padding-right: var(--gutter); }
.section { padding-top: 112px; padding-bottom: 112px; }
.rule-b { border-bottom: 1px solid var(--line); }
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 96px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; }
.stack { display: flex; flex-direction: column; }
.gap-8 { gap: 8px; } .gap-12 { gap: 12px; } .gap-16 { gap: 16px; } .gap-24 { gap: 24px; } .gap-32 { gap: 32px; } .gap-48 { gap: 48px; }
.row { display: flex; align-items: center; flex-wrap: wrap; }

@media (max-width: 1100px) { :root { --gutter: 48px; } .grid-2 { gap: 56px; } }
@media (max-width: 860px) {
  :root { --gutter: 24px; }
  .grid-2, .grid-3 { grid-template-columns: minmax(0, 1fr); gap: 40px; }
  .section { padding-top: 72px; padding-bottom: 72px; }
}

/* Header */
.site-header { position: sticky; top: 0; z-index: 20; background: var(--paper); border-bottom: 1px solid var(--line); padding-top: env(safe-area-inset-top, 0px); margin-top: calc(-1 * env(safe-area-inset-top, 0px)); }
.site-header .wrap { height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 16px; text-decoration: none; font-weight: 700; font-size: 20px; letter-spacing: -.01em; color: var(--ink); }
.brand .num { color: var(--slate); }
.brand svg { width: 18px; height: 18px; flex-shrink: 0; }
.brand .bar1 { fill: var(--ink); } .brand .bar2 { fill: var(--slate); }
.nav { display: flex; align-items: center; gap: 32px; font-size: 15px; }
.nav a { text-decoration: none; }
.nav a:not(.btn):hover { color: var(--slate); }
.menu-btn { display: none; width: 44px; height: 44px; border: 1px solid var(--line); border-radius: 4px; background: var(--paper-raised); color: var(--ink); align-items: center; justify-content: center; }
.menu-btn svg { width: 20px; height: 20px; }
@media (max-width: 860px) {
  .menu-btn { display: inline-flex; }
  .nav { display: none; position: absolute; left: 0; right: 0; top: 100%; background: var(--paper); border-bottom: 1px solid var(--line); flex-direction: column; align-items: stretch; gap: 0; padding: 8px var(--gutter) 20px; }
  .nav.open { display: flex; }
  .nav a:not(.btn) { padding: 14px 0; border-bottom: 1px solid var(--line); }
  .nav .btn { margin-top: 16px; justify-content: center; }
}

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 0 24px; border-radius: 4px; font-size: 16px; font-weight: 600; text-decoration: none; cursor: pointer; border: 1px solid transparent; }
.btn-primary { background: var(--marigold); color: var(--on-marigold); border-color: var(--marigold); }
.btn-primary:hover { filter: brightness(.96); }
.btn-quiet { background: var(--paper-raised); color: var(--ink); border-color: var(--line); }
.btn-quiet:hover { border-color: var(--ink); }
.btn-ink { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.btn-small { min-height: 40px; padding: 0 16px; font-size: 15px; }
.btn[disabled], .btn[aria-disabled="true"] { opacity: .5; cursor: not-allowed; }
.btn-block { width: 100%; }

/* Hero */
.hero { padding-top: 104px; padding-bottom: 112px; align-items: center; }
@media (max-width: 860px) { .hero { padding-top: 56px; padding-bottom: 72px; } }

/* Comparison */
.cmp { border: 1px solid var(--line); background: var(--paper-raised); }
.cmp-side { padding: 28px 32px; display: flex; flex-direction: column; gap: 10px; }
.cmp-before { border-bottom: 1px solid var(--line); }
.cmp-before .cmp-text { color: var(--slate); }
.cmp-after { background: var(--marigold-soft); }
.cmp-after .label { color: var(--ink); display: flex; align-items: center; gap: 10px; }
.dot { display: inline-block; width: 10px; height: 10px; background: var(--marigold); flex-shrink: 0; }
.cmp-text { margin: 0; font-family: var(--serif); font-style: italic; font-size: clamp(22px, 2.4vw, 30px); line-height: 1.3; }
.cmp-note { padding: 20px 32px; border-top: 1px solid var(--line); display: flex; flex-direction: column; gap: 12px; }
.cmp-note p { margin: 0; font-size: 14px; line-height: 22px; color: var(--slate); }
.cmp.side-by-side { display: grid; grid-template-columns: 1fr 1fr; }
.cmp.side-by-side .cmp-before { border-bottom: 0; border-right: 1px solid var(--line); }
.cmp.side-by-side .cmp-note { grid-column: 1 / -1; }
@media (max-width: 700px) { .cmp.side-by-side { grid-template-columns: 1fr; } .cmp.side-by-side .cmp-before { border-right: 0; border-bottom: 1px solid var(--line); } .cmp-side, .cmp-note { padding-left: 22px; padding-right: 22px; } }

/* Explain PT */
.pt { display: flex; flex-direction: column; gap: 10px; align-items: flex-start; }
.pt-btn { font-size: 14px; font-weight: 600; min-height: 40px; padding: 0 12px 0 6px; display: inline-flex; align-items: center; gap: 8px; border: 1px solid var(--line); border-radius: 4px; background: var(--paper-raised); color: var(--ink); cursor: pointer; }
.pt-btn:hover { border-color: var(--ink); }
.pt-tag { font-size: 11px; line-height: 16px; letter-spacing: .08em; padding: 2px 6px; border-radius: 2px; background: var(--marigold); color: var(--on-marigold); }
.pt-panel { background: var(--mist); color: var(--ink); padding: 16px; font-size: 15px; line-height: 24px; max-width: 60ch; }

/* Intro points */
.point-bar { width: 40px; height: 5px; background: var(--marigold); }

/* Course cards */
.course-card { background: var(--paper-raised); border: 1px solid var(--line); padding: 36px; display: flex; flex-direction: column; gap: 22px; }
.course-card.featured { background: var(--band); color: var(--on-band); border-color: var(--band); }
.course-card.featured .label { color: var(--marigold); }
.course-card.featured .desc, .course-card.featured .meta { color: #CBD5E1; }
.course-card .desc { margin: 0; color: var(--slate); }
.course-card ul { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.course-card.featured ul { border-color: var(--band-line); }
.course-card li { padding: 12px 0; border-bottom: 1px solid var(--line); font-size: 15px; line-height: 22px; }
.course-card.featured li { border-color: var(--band-line); }
.course-card .meta { margin: 0; font-size: 13px; line-height: 20px; color: var(--slate); }
.course-card .foot { margin-top: auto; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.price { margin: 0; font-size: 28px; font-weight: 600; }

/* Numbered steps */
.steps { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.steps li { padding: 22px 0; border-bottom: 1px solid var(--line); display: grid; grid-template-columns: 56px 1fr; gap: 12px; }
.steps .n { font-family: var(--serif); font-style: italic; font-size: 26px; line-height: 30px; color: var(--slate); }
.steps strong { display: block; font-size: 18px; line-height: 26px; font-weight: 600; }
.steps span.t { color: var(--slate); }

/* Panels */
.panel { background: var(--paper-raised); border: 1px solid var(--line); padding: 32px; display: flex; flex-direction: column; gap: 16px; }
.panel-mist { background: var(--mist); padding: 32px; display: flex; flex-direction: column; gap: 16px; }
@media (max-width: 700px) { .panel, .panel-mist, .course-card { padding: 24px; } }
.phrase { border-top: 1px solid var(--line); padding-top: 14px; }
.phrase p { margin: 0; }
.phrase .ph { font-weight: 600; }
.phrase .when { font-size: 13px; line-height: 20px; color: var(--slate); }

/* Drill */
.drill-prompt { margin: 0; font-family: var(--serif); font-style: italic; font-size: 24px; line-height: 32px; }
.opts { display: flex; flex-direction: column; gap: 8px; }
.opt { font-size: 15px; line-height: 22px; text-align: left; padding: 14px 16px; border: 1px solid var(--line); border-radius: 4px; background: var(--paper); color: var(--ink); display: flex; justify-content: space-between; align-items: center; gap: 16px; cursor: pointer; min-height: 48px; }
.opt:hover:not([disabled]) { border-color: var(--ink); }
.opt[disabled] { cursor: default; }
.opt.is-correct { background: var(--band); border-color: var(--band); color: var(--on-band); font-weight: 600; }
.opt.is-correct .tag { color: var(--marigold); }
.opt.is-wrong { background: var(--mist); border-color: var(--slate); }
.opt.is-wrong .txt { text-decoration: line-through; text-decoration-color: var(--slate); }
.opt.is-muted { color: var(--slate); }
.tag { font-size: 11px; font-weight: 600; letter-spacing: .12em; white-space: nowrap; }
.feedback { border-top: 1px solid var(--line); padding-top: 16px; display: flex; flex-direction: column; gap: 10px; align-items: flex-start; }
.feedback p { margin: 0; }
.verdict { font-weight: 600; }
textarea, input[type="email"], input[type="text"] { font: inherit; font-size: 16px; width: 100%; padding: 14px 16px; border: 1px solid var(--line); border-radius: 2px; background: var(--paper); color: var(--ink); }
textarea { min-height: 140px; resize: vertical; line-height: 1.5; }
label.field { display: flex; flex-direction: column; gap: 8px; font-weight: 600; font-size: 15px; }
.fb-list { margin: 0; padding-left: 20px; }
.improved { background: var(--marigold-soft); padding: 16px; font-family: var(--serif); font-style: italic; font-size: 19px; line-height: 28px; }

/* Band */
.band { background: var(--marigold); color: var(--on-marigold); }
.band .label { color: var(--on-marigold); }

/* Founder */
.founder { display: grid; grid-template-columns: 400px 1fr; gap: 96px; align-items: center; }
.photo { position: relative; width: 100%; max-width: 400px; aspect-ratio: 400 / 520; }
.photo::before { content: ""; position: absolute; inset: 0; transform: translate(20px, 20px); background: var(--marigold); }
.photo img { position: relative; width: 100%; height: 100%; object-fit: cover; object-position: center top; }
@media (max-width: 860px) { .founder { grid-template-columns: 1fr; gap: 48px; } .photo { max-width: 300px; } }

/* FAQ */
.faq { margin: 0; border-top: 1px solid var(--line); }
.faq > div { padding: 24px 0; border-bottom: 1px solid var(--line); }
.faq dt { font-size: 18px; line-height: 26px; font-weight: 600; }
.faq dd { margin: 8px 0 0; color: var(--slate); }
.faq-grid { display: grid; grid-template-columns: 360px 1fr; gap: 96px; }
@media (max-width: 860px) { .faq-grid { grid-template-columns: 1fr; gap: 32px; } }

/* Footer */
.site-footer { background: var(--band); color: var(--on-band); padding: 56px 0 calc(56px + env(safe-area-inset-bottom, 0px)); margin-bottom: calc(-1 * env(safe-area-inset-bottom, 0px)); }
.site-footer .wrap { display: flex; justify-content: space-between; align-items: flex-end; gap: 32px; flex-wrap: wrap; }
.site-footer .brand { color: #FAFAFA; font-size: 26px; gap: 18px; }
.site-footer .brand svg { width: 24px; height: 24px; }
.site-footer .brand .bar1 { fill: #FAFAFA; } .site-footer .brand .bar2 { fill: #94A3B8; } .site-footer .brand .num { color: #94A3B8; }
.site-footer nav { display: flex; gap: 24px; flex-wrap: wrap; font-size: 14px; }
.site-footer nav a { text-decoration: none; color: #FAFAFA; }

/* Course page */
.course-hero { background: var(--band); color: var(--on-band); padding: 96px 0 88px; }
.course-hero .label { color: var(--marigold); }
.course-hero .lead { color: #CBD5E1; }
.course-layout { display: grid; grid-template-columns: minmax(0, 1fr) 380px; gap: 80px; align-items: start; }
.buy-card { position: sticky; top: 96px; background: var(--paper-raised); border: 1px solid var(--line); border-top: 6px solid var(--marigold); padding: 32px; display: flex; flex-direction: column; gap: 18px; }
.buy-card ul { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.buy-card li { padding: 12px 0; border-bottom: 1px solid var(--line); font-size: 15px; line-height: 22px; }
@media (max-width: 960px) { .course-layout { grid-template-columns: 1fr; gap: 48px; } .buy-card { position: static; } .course-hero { padding: 64px 0 56px; } }

/* Test banner */
.test-banner { background: var(--mist); color: var(--ink); font-size: 13px; line-height: 20px; }
.test-banner .wrap { padding-top: 8px; padding-bottom: 8px; display: flex; gap: 12px; align-items: center; justify-content: space-between; flex-wrap: wrap; }
.linkbtn { background: none; border: 0; padding: 0; font: inherit; color: inherit; text-decoration: underline; cursor: pointer; min-height: 32px; }

/* Forms / narrow pages */
.narrow { max-width: 560px; margin: 0 auto; padding: 80px 24px 112px; display: flex; flex-direction: column; gap: 28px; }
.summary { border: 1px solid var(--line); background: var(--paper-raised); }
.summary > div { padding: 18px 20px; border-bottom: 1px solid var(--line); display: flex; justify-content: space-between; gap: 16px; }
.summary > div:last-child { border-bottom: 0; font-weight: 600; }
.pay-methods { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.pay-methods label { border: 1px solid var(--line); border-radius: 4px; padding: 14px 16px; display: flex; gap: 10px; align-items: center; cursor: pointer; background: var(--paper-raised); min-height: 48px; }
.pay-methods input { accent-color: var(--ink); width: 18px; height: 18px; }
.error { color: var(--ink); background: var(--marigold-soft); padding: 10px 14px; font-size: 14px; }

/* App */
.app-top { display: flex; justify-content: space-between; align-items: flex-end; gap: 24px; flex-wrap: wrap; }
.progress { height: 6px; background: var(--mist); width: 100%; }
.progress > span { display: block; height: 100%; background: var(--marigold); }
.lesson-list { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.lesson-list li { border-bottom: 1px solid var(--line); }
.lesson-list a, .lesson-list .locked { display: grid; grid-template-columns: 48px 1fr auto; gap: 12px; align-items: center; padding: 16px 0; text-decoration: none; min-height: 56px; }
.lesson-list .n { font-family: var(--serif); font-style: italic; font-size: 22px; color: var(--slate); }
.lesson-list .locked { color: var(--slate); }
.status { font-size: 13px; line-height: 20px; color: var(--slate); white-space: nowrap; display: inline-flex; align-items: center; gap: 8px; }
.status.done::before { content: ""; width: 10px; height: 10px; background: var(--marigold); display: inline-block; }
.video { position: relative; aspect-ratio: 16 / 9; background: var(--band); color: var(--on-band); display: flex; flex-direction: column; justify-content: flex-end; padding: clamp(20px, 4vw, 48px); gap: 12px; }
.video .label { color: var(--marigold); }
.video .vt { margin: 0; font-family: var(--serif); font-style: italic; font-size: clamp(26px, 4vw, 48px); line-height: 1.12; max-width: 16em; }
.video .play { position: absolute; top: clamp(20px, 4vw, 48px); right: clamp(20px, 4vw, 48px); font-size: 13px; color: #CBD5E1; }
.parts { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.parts > div { background: var(--paper-raised); padding: 22px; display: flex; flex-direction: column; gap: 6px; }
.parts .pn { font-weight: 600; font-size: 17px; }
.parts .ex { font-family: var(--serif); font-style: italic; font-size: 18px; line-height: 26px; }
@media (max-width: 600px) { .parts { grid-template-columns: 1fr; } }
.lesson-wrap { max-width: 820px; margin: 0 auto; padding: 48px 24px 112px; display: flex; flex-direction: column; gap: 56px; }
.done-bar { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; border-top: 1px solid var(--line); padding-top: 28px; }
.crumb { font-size: 14px; display: flex; gap: 8px; align-items: center; flex-wrap: wrap; color: var(--slate); }
.crumb a { color: var(--ink); }
.hidden { display: none !important; }