/* Clmbn brand tokens, matched to clmbn.co */
:root {
  --bg: #FFF6EA;        /* cream */
  --card: #ffffff;
  --coral: #FF8A7A;
  --coral-dark: #C9503F;
  --coral-hover: #FF9D8F;
  --ink: #0B3C49;       /* teal */
  --teal: #0B3C49;
  --teal-dark: #072A33;
  --peach: #FFE9DB;     /* section band */
  --line: #ecdfcc;
  --muted: #4a6168;
  --lead-on-teal: #D6E6E8;
  --code-bg: #FBF1E3;
  --radius: 18px;
  --max: 1100px;
  --display: "Bricolage Grotesque", system-ui, sans-serif;
  --font: Inter, system-ui, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  color-scheme: light;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.6 var(--font); }
h1, h2, h3 { font-family: var(--display); font-weight: 700; line-height: 1.1; letter-spacing: -0.01em; }
a { color: var(--coral-dark); }
img { max-width: 100%; }
[hidden] { display: none !important; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 16px; }

/* Header (white, like clmbn.co) */
.topbar {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; gap: 12px;
  padding: 8px 16px; background: #fff; border-bottom: 1px solid var(--line);
}
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: var(--teal); }
.brand img { display: block; height: 40px; width: auto; }
.brand-sub { font-family: var(--display); font-weight: 700; font-size: 1.05rem; padding-left: 10px; border-left: 2px solid var(--coral); line-height: 1.2; }
.topnav { margin-left: auto; display: flex; align-items: center; gap: 8px; }
.who { color: var(--muted); font-size: 0.9rem; max-width: 10rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* Buttons (pill, as on clmbn.co) */
.btn {
  display: inline-flex; align-items: center; justify-content: center; min-height: 44px;
  border: 1.5px solid transparent; border-radius: 999px; padding: 8px 18px;
  font: 600 0.95rem/1.2 var(--font); text-decoration: none; cursor: pointer; white-space: nowrap;
  transition: background 0.2s, transform 0.2s, color 0.2s;
}
.btn-coral { background: var(--coral); color: var(--teal); }
.btn-coral:hover { background: var(--coral-hover); transform: translateY(-1px); }
.btn-teal { background: var(--teal); color: var(--bg); }
.btn-teal:hover { background: var(--teal-dark); }
.btn-outline { background: transparent; color: var(--teal); border-color: var(--teal); }
.btn-outline:hover { background: var(--teal); color: #fff; }
.btn-ghost-light { background: transparent; color: #fff; border-color: rgba(255, 255, 255, 0.5); }
.btn-ghost-light:hover { background: rgba(255, 255, 255, 0.12); }
.btn-lg { padding: 15px 28px; font-size: 1rem; }
.btn:focus-visible, a:focus-visible, summary:focus-visible { outline: 3px solid var(--coral); outline-offset: 2px; }

/* Hero (teal with coral circles, as on clmbn.co) */
.hero { background: var(--teal); color: #fff; position: relative; overflow: hidden; }
.hero::before { content: ""; position: absolute; right: -120px; top: -120px; width: 420px; height: 420px; border-radius: 50%; background: var(--coral); opacity: 0.9; }
.hero::after { content: ""; position: absolute; right: 140px; bottom: -160px; width: 260px; height: 260px; border-radius: 50%; background: var(--teal-dark); opacity: 0.7; }
.hero .wrap { position: relative; z-index: 1; padding-top: 84px; padding-bottom: 96px; }
.eyebrow { display: inline-block; font-size: 13px; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; background: rgba(255, 255, 255, 0.14); padding: 6px 14px; border-radius: 999px; margin: 0 0 22px; }
.hero h1 { font-size: clamp(38px, 6vw, 64px); max-width: 15ch; margin: 0; }
.hero h1 em { font-style: normal; color: var(--coral); }
.lead { font-size: clamp(17px, 2.2vw, 20px); max-width: 52ch; margin: 22px 0 34px; color: var(--lead-on-teal); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.fineprint { color: var(--lead-on-teal); font-size: 0.9rem; margin: 16px 0 0; }

/* Sections */
.section { padding: 56px 0; }
.band { background: var(--peach); }
.kicker { color: var(--teal); font-weight: 600; font-size: 13px; letter-spacing: 0.08em; text-transform: uppercase; margin: 0 0 10px; display: flex; align-items: center; gap: 10px; }
.kicker::before { content: ""; width: 28px; height: 3px; border-radius: 2px; background: var(--coral); flex: 0 0 auto; }
.section h2 { font-size: clamp(26px, 4vw, 34px); margin: 0 0 24px; }
.grid { display: grid; gap: 18px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; }
.card h3 { font-size: 1.25rem; margin: 0 0 8px; }
.card p { margin: 0; color: var(--muted); }
.tag { display: inline-block; font-size: 12px; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; padding: 5px 12px; border-radius: 999px; background: var(--coral); color: var(--teal); margin-bottom: 14px; }
.tag.alt { background: var(--teal); color: var(--bg); }
.phases { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.phases li { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px 24px; }
.phases h3 { margin: 0 0 6px; font-size: 1.25rem; }
.phases p { margin: 0; color: var(--muted); }
.phases .tag { margin-bottom: 10px; }
.note { color: var(--muted); font-size: 0.95rem; margin-top: 18px; }

.cta-box { background: var(--teal); color: #fff; border-radius: 24px; padding: 48px 28px; text-align: center; position: relative; overflow: hidden; }
.cta-box::after { content: ""; position: absolute; right: -50px; bottom: -50px; width: 140px; height: 140px; border-radius: 50%; background: var(--coral); }
.cta-box h2 { color: #fff; margin: 0 0 22px; position: relative; z-index: 1; }
.cta-box .btn { position: relative; z-index: 1; }

footer { border-top: 1px solid var(--line); padding: 30px 0; color: var(--muted); font-size: 14px; }
footer .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; }
footer a { color: var(--teal); font-weight: 600; text-decoration: none; display: inline-block; padding: 10px 0; }

/* Learn app */
.layout { display: grid; grid-template-columns: 300px minmax(0, 1fr); max-width: 90rem; margin: 0 auto; }
.menu-btn { display: none; }
.sidebar { position: sticky; top: 57px; height: calc(100vh - 57px); overflow-y: auto; border-right: 1px solid var(--line); padding: 22px 12px 40px; }
.sidebar-title { font-family: var(--display); font-weight: 700; font-size: 1.1rem; line-height: 1.25; margin: 0 8px 14px; }
.nav-phase { font-size: 12px; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--teal); margin: 20px 8px 6px; display: flex; align-items: center; gap: 8px; }
.nav-phase::before { content: ""; width: 16px; height: 3px; border-radius: 2px; background: var(--coral); }
.sidebar ol { list-style: none; margin: 0; padding: 0; }
.sidebar li a, .sidebar li .soon { display: flex; align-items: baseline; gap: 10px; padding: 8px 10px; border-radius: 12px; color: var(--ink); text-decoration: none; font-size: 0.93rem; line-height: 1.35; }
.sidebar li a:hover { background: var(--peach); }
.sidebar li a.active { background: var(--teal); color: #fff; font-weight: 600; }
.sidebar li a.active .wk { color: var(--coral); }
.sidebar .wk { flex: 0 0 1.6rem; font-variant-numeric: tabular-nums; color: var(--muted); font-size: 0.82rem; font-weight: 600; }
.sidebar .soon { color: var(--muted); }
.sidebar .soon em { margin-left: auto; font-style: normal; font-size: 11px; font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase; border: 1px solid var(--line); border-radius: 999px; padding: 1px 8px; background: #fff; }

.lesson { padding: 36px 24px 80px; outline: none; min-width: 0; }
.lesson article { max-width: 46rem; margin: 0 auto; }
.lesson-eyebrow { display: inline-block; font-size: 12px; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; padding: 5px 12px; border-radius: 999px; background: var(--coral); color: var(--teal); margin: 0 0 14px; }
.lesson h1 { font-size: clamp(30px, 5vw, 44px); margin: 0 0 28px; }
.status { max-width: 46rem; margin: 40px auto; color: var(--muted); }

/* Lesson prose */
.prose h2 { font-size: 1.6rem; margin: 48px 0 14px; padding-top: 20px; border-top: 1px solid var(--line); }
.prose > h2:first-child { border-top: 0; margin-top: 0; padding-top: 0; }
.prose h3 { font-size: 1.2rem; margin: 30px 0 8px; }
.prose p, .prose li { max-width: 68ch; }
.prose li + li { margin-top: 4px; }
.prose li::marker { color: var(--coral-dark); font-weight: 600; }
.prose code { font-family: var(--mono); font-size: 0.88em; background: var(--code-bg); border: 1px solid var(--line); padding: 0 5px; border-radius: 6px; overflow-wrap: anywhere; }
.prose pre { background: var(--teal); color: #E8F1F2; border-radius: 14px; padding: 16px 18px; overflow-x: auto; }
.prose pre code { background: none; border: 0; padding: 0; font-size: 0.85rem; color: inherit; overflow-wrap: normal; }
.table-wrap { overflow-x: auto; margin: 18px 0; border: 1px solid var(--line); border-radius: 14px; background: var(--card); }
.prose table { border-collapse: collapse; width: 100%; font-size: 0.92rem; }
.prose th, .prose td { text-align: left; vertical-align: top; padding: 10px 12px; border-bottom: 1px solid var(--line); }
.prose th { background: var(--peach); font-weight: 600; white-space: nowrap; }
.prose tr:last-child td { border-bottom: 0; }
.prose details { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 14px 18px; margin: 18px 0; }
.prose summary { cursor: pointer; font-weight: 600; color: var(--teal); }
.prose summary::marker { color: var(--coral-dark); }
.prose strong { font-weight: 600; }

.pager { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-top: 52px; padding-top: 22px; border-top: 1px solid var(--line); }
.pager a { text-decoration: none; font-weight: 600; color: var(--teal); }
.pager a:hover { color: var(--coral-dark); }
.pager-next { margin-left: auto; text-align: right; }

@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; }
  .menu-btn { display: inline-flex; }
  .sidebar { position: fixed; top: 57px; left: 0; bottom: 0; width: min(320px, 88vw); height: auto; background: var(--bg); z-index: 15; transform: translateX(-105%); transition: transform 0.2s ease; }
  .menu-open .sidebar { transform: none; box-shadow: 0 0 0 100vmax rgba(7, 42, 51, 0.45); }
  .lesson { padding: 26px 16px 64px; }
  .who, .brand-sub { display: none; }
}
@media (max-width: 600px) {
  .hero::before { width: 260px; height: 260px; right: -110px; top: -110px; }
  .hero::after { display: none; }
  .hero .wrap { padding-top: 56px; padding-bottom: 64px; }
  .topnav .hide-sm { display: none; }
}
@media (prefers-reduced-motion: reduce) { .sidebar, .btn { transition: none; } }

/* Catalogue cards */
.course-card { display: flex; flex-direction: column; gap: 6px; text-decoration: none; color: var(--ink); transition: transform 0.2s, box-shadow 0.2s; }
.course-card:hover { transform: translateY(-2px); box-shadow: 0 10px 30px rgba(11, 60, 73, 0.08); }
.course-card h3 { margin: 4px 0 2px; }
.card-tags { display: flex; align-items: center; gap: 10px; }
.card-tags .tag { margin: 0; }
.card-level { font-size: 13px; font-weight: 600; color: var(--muted); }
.card-meta { font-size: 0.9rem; }
.card-cta { margin-top: auto; padding-top: 10px; font-weight: 600; color: var(--teal); }
.course-card:hover .card-cta { color: var(--coral-dark); }

/* Course page */
.about { font-size: 1.1rem; max-width: 62ch; margin: 0 0 28px; }
.outline-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 24px; }
.outline-head h2 { margin: 0; }
.outline { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.outline li { background: var(--card); border: 1px solid var(--line); border-radius: 14px; }
.outline details[open] { box-shadow: 0 6px 20px rgba(11, 60, 73, 0.06); }
.outline summary { list-style: none; display: flex; align-items: center; gap: 14px; padding: 14px 16px; cursor: pointer; border-radius: 14px; }
.outline summary::-webkit-details-marker { display: none; }
.outline summary:hover { background: var(--peach); }
.outline details[open] summary { border-bottom: 1px solid var(--line); border-radius: 14px 14px 0 0; }
.outline .wk { flex: 0 0 4.5rem; font-size: 13px; font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase; color: var(--coral-dark); }
.outline .wk-title { font-weight: 600; flex: 1; }
.outline summary em { font-style: normal; font-size: 11px; font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase; border: 1px solid var(--line); border-radius: 999px; padding: 1px 8px; color: var(--muted); white-space: nowrap; }
.outline summary em.is-ready { background: var(--teal); border-color: var(--teal); color: var(--bg); }
.outline .chev { flex: 0 0 auto; width: 10px; height: 10px; border-right: 2px solid var(--teal); border-bottom: 2px solid var(--teal); transform: rotate(45deg) translateY(-3px); transition: transform 0.2s; }
.outline details[open] .chev { transform: rotate(-135deg) translateY(-2px); }
.outline .is-soon .wk-title { color: var(--muted); }
.wk-body { padding: 16px 18px 20px; }
.wk-summary { margin: 0 0 14px; font-size: 1.02rem; }
.wk-label { margin: 0 0 4px; font-size: 12px; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; color: var(--teal); }
.wk-block ul { margin: 0 0 14px; padding-left: 20px; }
.wk-block li { border: 0; background: none; margin: 2px 0; }
.wk-block li::marker { color: var(--coral-dark); }
.wk-facts { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.wk-facts > div { background: var(--bg); border-radius: 12px; padding: 10px 14px; }
.wk-facts p:last-child { margin: 0; color: var(--muted); }
@media (max-width: 600px) { .outline summary { flex-wrap: wrap; gap: 4px 10px; } .outline .wk { flex-basis: auto; } .outline .wk-title { flex-basis: 100%; order: 3; } .outline summary em { margin-left: auto; } }
@media (prefers-reduced-motion: reduce) { .outline .chev { transition: none; } }
.hero-actions button[disabled] { opacity: 0.7; cursor: progress; }

/* Learn: enrol gate, linked sidebar title */
.gate { max-width: 40rem; margin: 48px auto; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 32px; }
.gate h1 { font-size: clamp(26px, 4vw, 34px); margin: 0 0 10px; }
.gate p { color: var(--muted); margin: 0 0 22px; }
a.sidebar-title { display: block; color: var(--ink); text-decoration: none; }
a.sidebar-title:hover { color: var(--coral-dark); }
@media (max-width: 600px) { #mycourses-btn { display: none; } }

/* Task lists ("Write it down", checklists) */
.prose ul:has(> li > label > input[type="checkbox"]), .prose ul:has(> li > input[type="checkbox"]) { list-style: none; padding-left: 4px; }
.prose li > input[type="checkbox"] { accent-color: var(--coral-dark); margin-right: 8px; transform: translateY(1px); }
.prose ul.task-list { list-style: none; padding-left: 4px; }
.prose ul.task-list label { display: inline-flex; gap: 8px; align-items: baseline; }
.prose h2#write-it-down { color: var(--coral-dark); }

/* Prerequisites */
.prereq-grid { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.prereq h3 { font-size: 1.1rem; margin: 0 0 10px; }
.prereq ul { margin: 0; padding-left: 18px; color: var(--muted); }
.prereq li { margin: 4px 0; }
.prereq li::marker { color: var(--coral-dark); }

/* Weekly hours */
.wk-hours { font-size: 13px; font-weight: 600; color: var(--muted); white-space: nowrap; }
.wk-time { margin-top: 14px; }
.wk-bar { display: flex; gap: 3px; height: 10px; border-radius: 999px; overflow: hidden; margin: 6px 0 8px; }
.wk-bar .seg { flex: 1 1 0; min-width: 6px; }
.seg-reading { background: var(--teal); }
.seg-lab { background: var(--coral); }
.seg-writing { background: #F2C14E; }
.wk-legend { display: flex; flex-wrap: wrap; gap: 6px 16px; margin: 0; font-size: 0.9rem; color: var(--muted); }
.wk-legend span { display: inline-flex; align-items: center; gap: 6px; }
.dot { width: 10px; height: 10px; border-radius: 3px; display: inline-block; }

/* FAQs */
.faq-list { display: grid; gap: 8px; max-width: 52rem; }
.faq { background: var(--card); border: 1px solid var(--line); border-radius: 14px; }
.faq summary { list-style: none; display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 16px 18px; cursor: pointer; font-weight: 600; border-radius: 14px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary:hover { background: var(--peach); }
.faq .chev { flex: 0 0 auto; width: 10px; height: 10px; border-right: 2px solid var(--teal); border-bottom: 2px solid var(--teal); transform: rotate(45deg) translateY(-3px); transition: transform 0.2s; }
.faq[open] .chev { transform: rotate(-135deg) translateY(-2px); }
.faq p { margin: 0; padding: 0 18px 18px; color: var(--muted); max-width: 68ch; }

.hero-sm .wrap { padding-top: 56px; padding-bottom: 64px; }