/* ============================================================
   ARCH public front door. Rides on edu.css tokens (light/dark,
   comfort classes, reduced motion), adds the marketing layout.
   Contrast notes: --cta is a deeper blue than --accent so white
   button text clears 4.5:1; body copy uses --ink / --ink-soft only.
   ============================================================ */
:root {
  --cta: #3f5d99;       /* white on this: ~6.6:1 */
  --cta-ink: #ffffff;
  --cta-hover: #334c7e;
  --f-max: 1080px;
}
@media (prefers-color-scheme: dark) { :root { --cta: #8fb0ee; --cta-ink: #0f1420; --cta-hover: #a8c2f3; } }
:root[data-theme="light"] { --cta: #3f5d99; --cta-ink: #fff; --cta-hover: #334c7e; }
:root[data-theme="dark"]  { --cta: #8fb0ee; --cta-ink: #0f1420; --cta-hover: #a8c2f3; }

html { scroll-behavior: smooth; scroll-padding-top: 84px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body.front { min-height: 100vh; display: flex; flex-direction: column; }
body.front main { flex: 1; outline: none; }
.f-wrap { max-width: var(--f-max); margin: 0 auto; padding: 0 var(--pad); }
.f-narrow { max-width: 760px; }
.f-center { text-align: center; }
.f-vh { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: -999px; top: 8px; z-index: 100; background: var(--cta); color: var(--cta-ink); padding: 10px 16px; border-radius: 10px; }
.skip:focus { left: 8px; }

/* ---------- header ---------- */
.f-top { position: sticky; top: 0; z-index: 40; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: saturate(1.2) blur(10px); border-bottom: 1px solid var(--line); }
.f-top-in { max-width: var(--f-max); margin: 0 auto; padding: 10px var(--pad); display: flex; align-items: center; gap: 18px; }
.f-brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; font-size: 1.2rem; letter-spacing: .01em; text-decoration: none; color: var(--ink); }
.f-nav { display: flex; gap: 4px; margin-left: 12px; }
.f-nav a { text-decoration: none; padding: 10px 12px; border-radius: 10px; color: var(--ink-soft); font-weight: 600; }
.f-nav a:hover { background: var(--bg-soft); color: var(--ink); }
.f-actions { margin-left: auto; display: flex; align-items: center; gap: 10px; }
@media (max-width: 760px) { .f-nav { display: none; } .f-hide-sm { display: none; } }

/* ---------- buttons ---------- */
.f-btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: var(--tap); padding: 0 22px; border-radius: 14px; font-weight: 700; text-decoration: none; border: 2px solid transparent; cursor: pointer; transition: background .15s ease, transform .15s ease; }
.f-btn-primary { background: var(--cta); color: var(--cta-ink); }
.f-btn-primary:hover { background: var(--cta-hover); transform: translateY(-1px); }
.f-btn-ghost { border-color: var(--line-strong); color: var(--ink); background: transparent; }
.f-btn-ghost:hover { background: var(--bg-soft); }
.f-btn-big { min-height: 54px; font-size: 1.05rem; }
.f-block { display: flex; width: 100%; }
.f-btn[disabled] { opacity: .6; cursor: default; transform: none; }
@media (prefers-reduced-motion: reduce) { .f-btn:hover { transform: none; } }

/* ---------- comfort menu ---------- */
.comfort { position: relative; }
.comfort > summary { list-style: none; display: inline-flex; align-items: center; gap: 8px; min-height: var(--tap); padding: 0 14px; border-radius: 14px; cursor: pointer; font-weight: 600; color: var(--ink-soft); }
.comfort > summary::-webkit-details-marker { display: none; }
.comfort > summary:hover, .comfort[open] > summary { background: var(--bg-soft); color: var(--ink); }
.comfort-pop { position: absolute; right: 0; top: calc(100% + 8px); width: min(300px, 86vw); background: var(--surface); border: 1px solid var(--line-strong); border-radius: var(--radius-sm); box-shadow: var(--shadow-lift); padding: 16px; display: grid; gap: 12px; z-index: 50; }
.comfort-pop fieldset { border: 0; padding: 0; display: grid; gap: 2px; }
.comfort-pop legend { font-weight: 700; margin-bottom: 4px; }
.comfort-pop label { display: flex; align-items: center; gap: 10px; min-height: 40px; cursor: pointer; }
.comfort-pop input { width: 20px; height: 20px; accent-color: var(--cta); }
.c-note { color: var(--ink-soft); font-size: .85rem; }

/* ---------- type ---------- */
.f-h1 { font-size: clamp(1.9rem, 4.6vw, 2.7rem); line-height: 1.15; letter-spacing: -.02em; margin-bottom: 10px; }
.f-h2 { font-size: clamp(1.5rem, 3.4vw, 2rem); line-height: 1.2; letter-spacing: -.01em; margin-bottom: 8px; }
.f-h3 { font-size: 1.15rem; line-height: 1.3; margin-bottom: 8px; }
.f-sub { color: var(--ink-soft); font-size: 1.08rem; max-width: 60ch; margin-bottom: 28px; }
.f-lede { color: var(--ink-soft); font-size: 1.15rem; max-width: 58ch; margin: 14px 0 26px; }
.f-eyebrow { display: inline-block; background: var(--accent-soft); color: var(--ink); border-radius: 999px; padding: 6px 14px; font-weight: 700; font-size: .92rem; }
.f-fine { color: var(--ink-soft); font-size: .88rem; margin-top: 12px; }
.f-opt { color: var(--ink-soft); font-weight: 400; }
body.front a:not(.f-btn):not(.f-brand):not(.skip) { color: var(--cta); text-underline-offset: 3px; }
.f-nav a, .f-foot nav a { color: var(--ink-soft); }

/* ---------- hero ---------- */
.f-hero { padding: clamp(28px, 6vw, 72px) 0 clamp(24px, 5vw, 56px); background: radial-gradient(1200px 400px at 85% -10%, var(--accent-soft), transparent 60%), radial-gradient(900px 400px at -10% 110%, var(--warm-soft), transparent 55%); }
.f-hero-in { display: grid; grid-template-columns: 1.25fr .75fr; gap: 40px; align-items: center; }
.f-hero h1 { font-size: clamp(2.1rem, 5.4vw, 3.3rem); line-height: 1.1; letter-spacing: -.025em; margin-top: 16px; }
.f-hero h1 em { font-style: normal; background: linear-gradient(transparent 62%, var(--warm-soft) 62%); }
.f-hero-art svg { width: 100%; max-width: 340px; margin: 0 auto; height: auto; }
@media (max-width: 860px) { .f-hero-in { grid-template-columns: 1fr; } .f-hero-art { display: none; } }
.rise-in { animation: rise .35s ease both; }

/* ---------- sections / cards ---------- */
.f-sec { padding: clamp(36px, 6vw, 72px) 0; }
.f-sec-tight { padding-top: clamp(24px, 4vw, 44px); }
.f-sec-soft { background: var(--bg-soft); }
.f-sec-cta { background: linear-gradient(180deg, var(--bg), var(--accent-soft)); }
.f-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow); }
.f-card p { color: var(--ink-soft); }
.f-card-accent { background: var(--accent-soft); }
.f-grid { display: grid; gap: 18px; }
.f-grid-3 { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 900px) { .f-grid-3 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .f-grid-3 { grid-template-columns: 1fr; } }
.f-ico { display: inline-grid; place-items: center; width: 44px; height: 44px; border-radius: 12px; background: var(--warm-soft); font-size: 1.35rem; margin-bottom: 12px; }
.f-chips { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 28px; }
.f-chips li { background: var(--surface); border: 1px solid var(--line-strong); padding: 8px 18px; border-radius: 999px; font-weight: 700; }
.f-who p { color: var(--ink-soft); }

/* ---------- waitlist form ---------- */
.f-wl-card { padding: 22px; margin-top: 4px; }
.f-wl-row { display: grid; grid-template-columns: 1.4fr 1fr; gap: 14px; margin-bottom: 14px; }
@media (max-width: 620px) { .f-wl-row { grid-template-columns: 1fr; } }
.f-field label { display: block; font-weight: 700; margin-bottom: 6px; }
.f-field input, .f-field select, .f-search input { width: 100%; min-height: var(--tap); padding: 0 14px; border-radius: 12px; border: 2px solid var(--line-strong); background: var(--bg); color: var(--ink); }
.f-field input:focus, .f-field select:focus, .f-search input:focus { border-color: var(--cta); outline: none; box-shadow: 0 0 0 3px color-mix(in srgb, var(--cta) 30%, transparent); }
.f-hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.f-wl-msg { margin-top: 12px; min-height: 1.5em; font-weight: 600; color: var(--ink); }
.f-wl-msg.ok { color: var(--good); }
.f-wl-card .f-btn { width: 100%; }

/* ---------- FAQ ---------- */
.f-faq details { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-sm); margin-bottom: 10px; }
.f-faq summary, .f-syllabus summary { cursor: pointer; padding: 16px 18px; font-weight: 700; list-style: none; display: flex; align-items: center; gap: 10px; min-height: var(--tap); }
.f-faq summary::-webkit-details-marker, .f-syllabus summary::-webkit-details-marker { display: none; }
.f-faq summary::after { content: "+"; margin-left: auto; font-size: 1.4rem; color: var(--ink-soft); }
.f-faq details[open] summary::after { content: "\2212"; }
.f-faq p { padding: 0 18px 18px; color: var(--ink-soft); }

/* ---------- catalog + course ---------- */
.f-search { display: flex; gap: 10px; max-width: 520px; margin-bottom: 26px; }
.f-courses { list-style: none; padding: 0; }
.f-course h2 a { text-decoration: none; color: var(--ink); }
.f-course h2 a:hover { text-decoration: underline; }
.f-clamp { display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.f-meta { display: flex; flex-wrap: wrap; gap: 6px 14px; margin: 12px 0 22px; color: var(--ink-soft); font-size: .93rem; }
.f-course .f-meta { margin-bottom: 0; }
.f-meta span:not(:last-child)::after { content: "\00b7"; margin-left: 14px; }
.f-empty { text-align: center; padding: 38px 22px; }
.f-course-page { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 36px; align-items: start; }
.f-course-side { position: sticky; top: 90px; }
@media (max-width: 900px) { .f-course-page { grid-template-columns: 1fr; } .f-course-side { position: static; } }
.f-crumb { margin-bottom: 14px; }
.f-syllabus details { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-sm); margin-bottom: 10px; }
.f-syllabus details > p, .f-syllabus .f-obj, .f-syllabus .f-lessons { margin: 0 18px 14px; color: var(--ink-soft); }
.f-mod-n { display: inline-grid; place-items: center; min-width: 30px; height: 30px; border-radius: 50%; background: var(--accent-soft); font-weight: 800; }
.f-mod-count { margin-left: auto; font-weight: 500; color: var(--ink-soft); font-size: .9rem; }
.f-obj { padding-left: 1.2em; }
.f-lessons { padding-left: 1.4em; }
.f-lessons li { padding: 4px 0; }
.f-min { color: var(--ink-soft); font-size: .88rem; margin-left: 6px; }

/* ---------- footer ---------- */
.f-foot { border-top: 1px solid var(--line); background: var(--bg-soft); padding: 32px 0; margin-top: 24px; }
.f-foot-in { display: flex; flex-wrap: wrap; gap: 20px 40px; align-items: flex-start; }
.f-foot nav { display: flex; gap: 6px 22px; flex-wrap: wrap; }
.f-foot nav a { text-decoration: none; padding: 8px 0; font-weight: 600; }
.f-foot-tag { color: var(--ink-soft); margin-top: 8px; }
.f-foot .f-fine { flex-basis: 100%; margin: 0; }