/* EthicsComputer Courses: site styles (light + dark). */

@font-face { font-family: 'Inter'; font-style: normal; font-weight: 400 700; font-display: swap; src: url('../fonts/inter-latin.woff2') format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+20B9, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }
@font-face { font-family: 'Inter'; font-style: normal; font-weight: 400 700; font-display: swap; src: url('../fonts/inter-latin-ext.woff2') format('woff2'); unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+1E00-1E9F, U+20A0-20AB, U+20AD-20C4, U+2C60-2C7F, U+A720-A7FF; }
@font-face { font-family: 'Plus Jakarta Sans'; font-style: normal; font-weight: 400 800; font-display: swap; src: url('../fonts/plus-jakarta-sans-latin.woff2') format('woff2'); unicode-range: U+0000-00FF, U+2000-206F, U+20B9, U+2122; }
@font-face { font-family: 'JetBrains Mono'; font-style: normal; font-weight: 400 600; font-display: swap; src: url('../fonts/jetbrains-mono-latin.woff2') format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02C6, U+02DA, U+02DC, U+2000-206F, U+20B9, U+2122, U+2190-2193, U+2212; }

:root {
  --bg: #ffffff;
  --bg-soft: #f6f8fa;
  --bg-muted: #eef1f5;
  --text: #17202b;
  --text-2: #4b5768;
  --border: #e2e6ec;
  --brand: #047857;
  --brand-hover: #065f46;
  --brand-soft: #e6f6ef;
  --brand-ink: #ffffff;
  --link: #0a64c2;
  --icode-bg: #f0f2f5;
  --icode: #b42357;
  --code-bg: #101827;
  --code-head: #0b1220;
  --code-text: #e5e9f0;
  --shadow: 0 1px 2px rgb(16 24 40 / .06), 0 4px 16px rgb(16 24 40 / .06);
  --note: #0a64c2; --note-bg: #eef5fd;
  --tip: #047857; --tip-bg: #ebf8f2;
  --warn: #9a5b00; --warn-bg: #fff6e5;
  --new: #6d28d9; --new-bg: #f4effe;
  --ok: #047857; --bad: #c0283c;
  --course: var(--brand);
  --header-h: 60px;
  --radius: 12px;
  --font: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --font-head: 'Plus Jakarta Sans', var(--font);
  --font-mono: 'JetBrains Mono', ui-monospace, 'Cascadia Code', Consolas, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0d1117; --bg-soft: #131a23; --bg-muted: #1a2330; --text: #e6edf3; --text-2: #a7b3c2; --border: #263142;
    --brand: #34d399; --brand-hover: #6ee7b7; --brand-soft: #0e2a21; --brand-ink: #052e22; --link: #6cb6ff;
    --icode-bg: #1d2633; --icode: #f9a8d4; --code-bg: #0a0f17; --code-head: #070b12;
    --shadow: 0 1px 2px rgb(0 0 0 / .4), 0 6px 20px rgb(0 0 0 / .35);
    --note: #6cb6ff; --note-bg: #0f2135; --tip: #34d399; --tip-bg: #0e2a21; --warn: #f5b84c; --warn-bg: #2b2210; --new: #b69cff; --new-bg: #221a3a;
    --ok: #34d399; --bad: #ff7b8b;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0d1117; --bg-soft: #131a23; --bg-muted: #1a2330; --text: #e6edf3; --text-2: #a7b3c2; --border: #263142;
  --brand: #34d399; --brand-hover: #6ee7b7; --brand-soft: #0e2a21; --brand-ink: #052e22; --link: #6cb6ff;
  --icode-bg: #1d2633; --icode: #f9a8d4; --code-bg: #0a0f17; --code-head: #070b12;
  --shadow: 0 1px 2px rgb(0 0 0 / .4), 0 6px 20px rgb(0 0 0 / .35);
  --note: #6cb6ff; --note-bg: #0f2135; --tip: #34d399; --tip-bg: #0e2a21; --warn: #f5b84c; --warn-bg: #2b2210; --new: #b69cff; --new-bg: #221a3a;
  --ok: #34d399; --bad: #ff7b8b;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: calc(var(--header-h) + 16px); }
body { margin: 0; background: var(--bg); color: var(--text); font: 400 16px/1.7 var(--font); overflow-wrap: break-word; }
img, svg { max-width: 100%; height: auto; }
a { color: var(--link); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
h1, h2, h3 { font-family: var(--font-head); line-height: 1.25; letter-spacing: -.01em; text-wrap: balance; }
:focus-visible { outline: 3px solid var(--brand); outline-offset: 2px; border-radius: 4px; }
.skip-link { position: absolute; left: 12px; top: -60px; z-index: 100; background: var(--brand); color: var(--brand-ink); padding: 8px 14px; border-radius: 8px; font-weight: 600; }
.skip-link:focus { top: 10px; }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.wrap { width: min(1200px, 100% - 32px); margin-inline: auto; }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 42px; padding: 0 18px; border-radius: 10px; border: 1px solid transparent; font: 600 15px/1 var(--font); text-decoration: none; cursor: pointer; white-space: nowrap; transition: background-color .15s, border-color .15s, color .15s; }
.btn-primary { background: var(--brand); color: var(--brand-ink); }
.btn-primary:hover { background: var(--brand-hover); }
.btn-ghost { background: transparent; color: var(--text); border-color: var(--border); }
.btn-ghost:hover { background: var(--bg-muted); }
.btn-sm { min-height: 36px; padding: 0 14px; font-size: 14px; }
.icon-btn { display: inline-grid; place-items: center; width: 40px; height: 40px; border-radius: 10px; border: 1px solid var(--border); background: var(--bg); color: var(--text); cursor: pointer; }
.icon-btn:hover { background: var(--bg-muted); }
.icon-btn svg { width: 18px; height: 18px; }

/* Header */
.site-header { position: sticky; top: 0; z-index: 50; height: var(--header-h); background: color-mix(in srgb, var(--bg) 92%, transparent); backdrop-filter: saturate(160%) blur(10px); border-bottom: 1px solid var(--border); }
.header-inner { display: flex; align-items: center; gap: 16px; height: 100%; padding-inline: 16px; max-width: 1440px; margin-inline: auto; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; flex: none; }
.brand img { width: 32px; height: 32px; border-radius: 8px; }
.brand-name { font: 800 17px/1.1 var(--font-head); }
.brand-name small { display: block; font: 600 11px/1.2 var(--font); color: var(--brand); letter-spacing: .08em; text-transform: uppercase; }
.course-tabs { display: flex; gap: 2px; overflow-x: auto; scrollbar-width: none; flex: 1; min-width: 0; margin: 0; padding: 0; list-style: none; }
.course-tabs::-webkit-scrollbar { display: none; }
.course-tabs a { display: block; padding: 7px 12px; border-radius: 8px; color: var(--text-2); font-weight: 600; font-size: 14.5px; text-decoration: none; white-space: nowrap; }
.course-tabs a:hover { color: var(--text); background: var(--bg-muted); }
.course-tabs a[aria-current="true"] { color: var(--text); background: var(--bg-muted); box-shadow: inset 0 -2px 0 var(--tab-color, var(--brand)); }
.header-actions { display: flex; align-items: center; gap: 8px; flex: none; }
.search-btn { display: inline-flex; align-items: center; gap: 8px; height: 40px; padding: 0 12px; border-radius: 10px; border: 1px solid var(--border); background: var(--bg-soft); color: var(--text-2); font: 500 14px var(--font); cursor: pointer; }
.search-btn kbd { font: 600 11px var(--font-mono); padding: 2px 6px; border-radius: 5px; border: 1px solid var(--border); background: var(--bg); }
@media (max-width: 1100px) { .search-btn .search-label, .search-btn kbd { display: none; } .search-btn { width: 40px; justify-content: center; padding: 0; } }
@media (max-width: 860px) { .course-tabs { display: none; } .header-cta { display: none; } .brand-name small { display: none; } .header-actions { margin-left: auto; } }

/* Mobile course strip */
.mobile-strip { display: none; }
@media (max-width: 860px) {
  .mobile-strip { display: flex; gap: 8px; align-items: center; padding: 8px 16px; border-bottom: 1px solid var(--border); background: var(--bg); position: sticky; top: var(--header-h); z-index: 40; }
  .mobile-strip select { flex: 1; min-width: 0; height: 38px; border-radius: 9px; border: 1px solid var(--border); background: var(--bg-soft); color: var(--text); font: 600 14px var(--font); padding: 0 10px; }
}

/* Docs layout */
.docs { display: grid; grid-template-columns: 272px minmax(0, 1fr); max-width: 1440px; margin-inline: auto; }
@media (min-width: 1280px) { .docs.has-toc { grid-template-columns: 272px minmax(0, 1fr) 230px; } }
.sidebar { position: sticky; top: var(--header-h); height: calc(100dvh - var(--header-h)); overflow-y: auto; border-right: 1px solid var(--border); padding: 20px 14px 40px; background: var(--bg-soft); scrollbar-width: thin; }
.sidebar-course { display: flex; align-items: center; gap: 10px; padding: 4px 8px 14px; color: var(--text); text-decoration: none; }
.sidebar-course .course-dot { width: 34px; height: 34px; }
.sidebar-course strong { font: 800 16px var(--font-head); }
.sidebar-course span { display: block; font-size: 12.5px; color: var(--text-2); }
.progress { margin: 0 8px 16px; }
.progress-bar { height: 6px; border-radius: 99px; background: var(--bg-muted); overflow: hidden; }
.progress-bar span { display: block; height: 100%; width: 0; background: var(--course); border-radius: inherit; transition: width .3s; }
.progress-text { font-size: 12.5px; color: var(--text-2); margin-top: 6px; }
.side-section { margin-bottom: 14px; }
.side-section h2 { font: 700 11.5px/1.4 var(--font); text-transform: uppercase; letter-spacing: .08em; color: var(--text-2); margin: 0 8px 6px; }
.side-section ol { list-style: none; margin: 0; padding: 0; }
.side-section a, .side-section .soon { display: flex; align-items: center; gap: 8px; padding: 6px 10px; border-radius: 8px; color: var(--text); text-decoration: none; font-size: 14.5px; line-height: 1.35; }
.side-section a:hover { background: var(--bg-muted); }
.side-section a[aria-current="page"] { background: var(--brand-soft); color: var(--text); font-weight: 650; box-shadow: inset 3px 0 0 var(--course); }
.side-section .soon { color: var(--text-2); opacity: .6; cursor: default; }
.side-section .soon em { margin-left: auto; font-style: normal; font-size: 11px; }
.side-section .done-mark { margin-left: auto; color: var(--ok); font-size: 13px; visibility: hidden; }
.side-section a.is-done .done-mark { visibility: visible; }
@media (max-width: 860px) {
  .docs, .docs.has-toc { grid-template-columns: minmax(0, 1fr); }
  .sidebar { position: fixed; inset: 0 auto 0 0; z-index: 60; width: min(320px, 86vw); height: 100dvh; top: 0; transform: translateX(-102%); transition: transform .25s ease; box-shadow: var(--shadow); padding-top: 18px; }
  .sidebar.open { transform: none; }
  .sidebar-backdrop { position: fixed; inset: 0; background: rgb(0 0 0 / .45); z-index: 55; }
}
@media (min-width: 861px) { .sidebar-backdrop, .sidebar-close { display: none !important; } }
.sidebar-close { position: absolute; right: 10px; top: 10px; }

/* Main content */
.content { padding: 28px 40px 64px; min-width: 0; }
@media (max-width: 860px) { .content { padding: 20px 16px 48px; } }
.article { max-width: 780px; margin-inline: auto; }
.breadcrumb { display: flex; flex-wrap: wrap; gap: 6px; font-size: 13.5px; color: var(--text-2); margin: 0 0 14px; padding: 0; list-style: none; }
.breadcrumb li + li::before { content: '/'; margin-right: 6px; opacity: .6; }
.breadcrumb a { color: var(--text-2); text-decoration: none; }
.breadcrumb a:hover { color: var(--text); text-decoration: underline; }
.lesson-head h1 { font-size: clamp(1.9rem, 1.4rem + 2vw, 2.6rem); margin: 0 0 10px; }
.lesson-meta { display: flex; flex-wrap: wrap; gap: 8px 16px; align-items: center; color: var(--text-2); font-size: 14px; margin-bottom: 26px; padding-bottom: 18px; border-bottom: 1px solid var(--border); }
.pill { display: inline-flex; align-items: center; gap: 6px; padding: 3px 10px; border-radius: 99px; background: var(--bg-muted); font-size: 12.5px; font-weight: 600; color: var(--text-2); }
.pill-course { background: color-mix(in srgb, var(--course) 14%, transparent); color: var(--text); }
.prose { font-size: 16.5px; }
.prose > * + * { margin-top: 0; }
.prose p { margin: 0 0 1.1em; }
.prose h2 { font-size: 1.6rem; margin: 2.1em 0 .6em; padding-top: .2em; }
.prose h3 { font-size: 1.22rem; margin: 1.7em 0 .5em; }
.prose ul, .prose ol { margin: 0 0 1.2em; padding-left: 1.4em; }
.prose li { margin: .3em 0; }
.prose li::marker { color: var(--text-2); }
.prose code { font: 500 .88em var(--font-mono); background: var(--icode-bg); color: var(--icode); padding: .12em .38em; border-radius: 6px; }
.prose a code { color: inherit; }
.prose hr { border: 0; border-top: 1px solid var(--border); margin: 2em 0; }
.prose strong { font-weight: 650; }
.table-wrap { overflow-x: auto; margin: 0 0 1.4em; border: 1px solid var(--border); border-radius: var(--radius); }
.prose table { border-collapse: collapse; width: 100%; font-size: 15px; }
.prose th, .prose td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--border); vertical-align: top; }
.prose th { background: var(--bg-soft); font-weight: 650; }
.prose tr:last-child td { border-bottom: 0; }

/* Code blocks */
figure.code { margin: 0 0 1.4em; border-radius: var(--radius); overflow: hidden; background: var(--code-bg); border: 1px solid color-mix(in srgb, var(--code-bg) 70%, var(--border)); }
figure.code figcaption { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 6px 8px 6px 14px; background: var(--code-head); color: #9fb0c6; font: 600 12px var(--font); letter-spacing: .04em; text-transform: uppercase; }
.code-actions { display: flex; gap: 6px; }
.code-copy, .code-tryit { font: 600 12.5px/1 var(--font); letter-spacing: 0; text-transform: none; border-radius: 7px; padding: 7px 11px; cursor: pointer; text-decoration: none; }
.code-copy { background: transparent; color: #cbd5e1; border: 1px solid #334155; }
.code-copy:hover { background: #1e293b; }
.code-tryit { background: #10b981; color: #052e22; border: 1px solid #10b981; }
.code-tryit:hover { background: #34d399; }
figure.code pre { margin: 0; padding: 16px 18px; overflow-x: auto; font: 14px/1.6 var(--font-mono); color: var(--code-text); tab-size: 2; }
figure.code pre code { font: inherit; background: none; color: inherit; padding: 0; }
.output { margin: -0.6em 0 1.4em; border: 1px dashed var(--border); border-radius: var(--radius); background: var(--bg-soft); }
.output-label { font: 700 11px var(--font); letter-spacing: .08em; text-transform: uppercase; color: var(--text-2); padding: 8px 14px 0; }
.output pre { margin: 0; padding: 6px 14px 12px; overflow-x: auto; font: 13.5px/1.55 var(--font-mono); color: var(--text); }

/* Prism tokens (code is always on a dark background) */
.token.comment, .token.prolog, .token.doctype, .token.cdata { color: #7f8ea3; font-style: italic; }
.token.punctuation { color: #a9b6c8; }
.token.tag, .token.deleted, .token.selector .token.class { color: #ff8fa3; }
.token.attr-name, .token.property, .token.class-name, .token.constant, .token.symbol { color: #ffcb6b; }
.token.boolean, .token.number { color: #f78c6c; }
.token.string, .token.char, .token.attr-value, .token.inserted, .token.url { color: #a5e075; }
.token.operator, .token.entity { color: #89ddff; }
.token.atrule, .token.keyword, .token.important { color: #c792ea; }
.token.function { color: #82aaff; }
.token.regex, .token.variable { color: #f7c46c; }
.token.selector { color: #ff8fa3; }
.token.builtin { color: #7fdbca; }

/* Callouts */
.callout { margin: 0 0 1.4em; padding: 14px 18px; border-radius: var(--radius); border-left: 4px solid var(--c); background: var(--cbg); }
.callout > :last-child { margin-bottom: 0; }
.callout-title { font: 700 13.5px var(--font); text-transform: uppercase; letter-spacing: .05em; color: var(--c); margin: 0 0 .35em !important; }
.callout-note { --c: var(--note); --cbg: var(--note-bg); }
.callout-tip { --c: var(--tip); --cbg: var(--tip-bg); }
.callout-warning { --c: var(--warn); --cbg: var(--warn-bg); }
.callout-new { --c: var(--new); --cbg: var(--new-bg); }

/* Exercise, solution, quiz */
.exercise { margin: 2.2em 0 1em; padding: 4px 22px 10px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg-soft); }
.exercise h2 { margin-top: .9em !important; font-size: 1.35rem !important; }
details.solution { margin: 0 0 2em; border: 1px solid var(--border); border-radius: var(--radius); padding: 0 18px; }
details.solution summary { cursor: pointer; padding: 12px 0; font-weight: 650; color: var(--brand); }
details.solution[open] { padding-bottom: 6px; }
.quiz { margin: 2.4em 0 1em; }
.quiz h2 { margin-top: 0 !important; }
.quiz-q { padding: 16px 18px; border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 14px; }
.quiz-question { font-weight: 600; margin: 0 0 12px !important; }
.quiz-num { color: var(--text-2); }
.quiz-options { display: grid; gap: 8px; }
.quiz-option { text-align: left; font: 500 15px/1.45 var(--font); color: var(--text); background: var(--bg); border: 1px solid var(--border); border-radius: 10px; padding: 10px 14px; cursor: pointer; }
.quiz-option:hover:not(:disabled) { border-color: var(--brand); background: var(--brand-soft); }
.quiz-option:disabled { cursor: default; }
.quiz-option.is-right { border-color: var(--ok); background: color-mix(in srgb, var(--ok) 14%, transparent); }
.quiz-option.is-wrong { border-color: var(--bad); background: color-mix(in srgb, var(--bad) 12%, transparent); }
.quiz-option.is-right::after { content: '  ✓ Correct'; color: var(--ok); font-weight: 700; }
.quiz-option.is-wrong::after { content: '  ✗ Not quite'; color: var(--bad); font-weight: 700; }
.quiz-why { margin: 12px 0 0 !important; padding: 10px 14px; background: var(--bg-soft); border-radius: 10px; font-size: 15px; }
.quiz-score { font-weight: 650; color: var(--text-2); }

/* Prev / next + complete */
.lesson-foot { margin-top: 36px; border-top: 1px solid var(--border); padding-top: 22px; }
.complete-row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; justify-content: space-between; margin-bottom: 18px; }
.complete-btn[aria-pressed="true"] { background: var(--brand-soft); border-color: var(--brand); color: var(--text); }
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.pager a { display: block; padding: 14px 16px; border: 1px solid var(--border); border-radius: var(--radius); text-decoration: none; color: var(--text); }
.pager a:hover { border-color: var(--brand); background: var(--bg-soft); }
.pager small { display: block; color: var(--text-2); font-size: 12.5px; font-weight: 600; text-transform: uppercase; letter-spacing: .06em; }
.pager strong { font-family: var(--font-head); }
.pager .next { text-align: right; grid-column: 2; }
@media (max-width: 560px) { .pager { grid-template-columns: 1fr; } .pager .next { grid-column: 1; } }

/* Training CTA */
.cta-card { margin: 36px 0 0; padding: 22px 24px; border-radius: 16px; background: linear-gradient(135deg, color-mix(in srgb, var(--course) 16%, var(--bg)) 0%, var(--bg-soft) 70%); border: 1px solid color-mix(in srgb, var(--course) 35%, var(--border)); display: grid; grid-template-columns: 1fr auto; gap: 16px 24px; align-items: center; }
.cta-card h2 { margin: 0 0 6px; font-size: 1.3rem; }
.cta-card p { margin: 0; color: var(--text-2); }
.cta-card ul { margin: 10px 0 0; padding: 0; list-style: none; display: flex; flex-wrap: wrap; gap: 6px 16px; font-size: 14px; color: var(--text); }
.cta-card li::before { content: '✓ '; color: var(--brand); font-weight: 700; }
.cta-actions { display: flex; flex-direction: column; gap: 8px; }
@media (max-width: 640px) { .cta-card { grid-template-columns: 1fr; } .cta-actions { flex-direction: row; flex-wrap: wrap; } }
.toc-cta { margin-top: 22px; padding: 14px; border-radius: var(--radius); border: 1px solid var(--border); background: var(--bg-soft); font-size: 13.5px; }
.toc-cta strong { display: block; font-family: var(--font-head); font-size: 14.5px; margin-bottom: 4px; }
.toc-cta p { margin: 0 0 10px; color: var(--text-2); }

/* Table of contents */
.toc { display: none; }
@media (min-width: 1280px) {
  .toc { display: block; position: sticky; top: calc(var(--header-h) + 24px); align-self: start; max-height: calc(100dvh - var(--header-h) - 48px); overflow-y: auto; padding: 28px 18px 0 6px; font-size: 13.5px; }
  .toc h2 { font: 700 11.5px var(--font); text-transform: uppercase; letter-spacing: .08em; color: var(--text-2); margin: 0 0 8px; }
  .toc ol { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--border); }
  .toc ol a { display: block; padding: 4px 0 4px 12px; margin-left: -1px; border-left: 2px solid transparent; color: var(--text-2); text-decoration: none; line-height: 1.4; }
  .toc ol a:hover { color: var(--text); }
  .toc ol a.active { color: var(--text); border-left-color: var(--course); font-weight: 600; }
  .toc .lvl-3 a { padding-left: 24px; }
}

/* Home */
.hero { padding: 64px 0 40px; text-align: center; background: radial-gradient(1200px 400px at 50% -100px, var(--brand-soft), transparent 70%); }
.hero h1 { font-size: clamp(2.1rem, 1.3rem + 3.6vw, 3.6rem); margin: 0 auto 14px; max-width: 18ch; }
.hero h1 span { color: var(--brand); }
.hero p { font-size: clamp(1.05rem, 1rem + .4vw, 1.25rem); color: var(--text-2); max-width: 62ch; margin: 0 auto 26px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; }
.hero-badges { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px 18px; margin-top: 26px; color: var(--text-2); font-size: 14px; }
.hero-badges span::before { content: '● '; color: var(--brand); }
.section { padding: 40px 0; }
.section-head { display: flex; flex-wrap: wrap; align-items: end; justify-content: space-between; gap: 10px; margin-bottom: 20px; }
.section-head h2 { margin: 0; font-size: clamp(1.5rem, 1.2rem + 1.2vw, 2rem); }
.section-head p { margin: 0; color: var(--text-2); }
.course-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 320px), 1fr)); gap: 16px; }
.course-card { position: relative; display: flex; flex-direction: column; gap: 10px; padding: 22px; border: 1px solid var(--border); border-radius: 16px; background: var(--bg); text-decoration: none; color: var(--text); box-shadow: var(--shadow); transition: transform .15s, border-color .15s; }
.course-card:hover { transform: translateY(-2px); border-color: color-mix(in srgb, var(--course) 60%, var(--border)); }
.course-card h3 { margin: 0; font-size: 1.3rem; }
.course-card p { margin: 0; color: var(--text-2); font-size: 15px; flex: 1; }
.course-card .meta { display: flex; flex-wrap: wrap; gap: 6px; }
.course-card .go { font-weight: 650; color: var(--brand); }
.course-dot { display: inline-grid; place-items: center; width: 46px; height: 46px; border-radius: 12px; background: var(--course); color: #fff; font: 800 15px var(--font-mono); flex: none; }
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr)); gap: 16px; }
.feature { padding: 20px; border-radius: 14px; background: var(--bg-soft); border: 1px solid var(--border); }
.feature h3 { margin: 0 0 6px; font-size: 1.08rem; }
.feature p { margin: 0; color: var(--text-2); font-size: 15px; }
.band { margin: 24px 0 56px; padding: 32px; border-radius: 20px; background: linear-gradient(135deg, #064e3b, #047857 60%, #0f766e); color: #ecfdf5; display: grid; grid-template-columns: 1fr auto; gap: 20px; align-items: center; }
.band h2 { margin: 0 0 8px; color: #fff; font-size: clamp(1.4rem, 1.1rem + 1vw, 1.9rem); }
.band p { margin: 0; color: #d1fae5; }
.band .btn-primary { background: #fff; color: #064e3b; }
.band .btn-primary:hover { background: #d1fae5; }
.band .btn-ghost { color: #fff; border-color: rgb(255 255 255 / .45); }
.band .btn-ghost:hover { background: rgb(255 255 255 / .12); }
@media (max-width: 720px) { .band { grid-template-columns: 1fr; padding: 24px; } }

/* Course landing */
.course-hero { display: flex; gap: 18px; align-items: flex-start; margin-bottom: 18px; }
.course-hero h1 { margin: 0 0 8px; font-size: clamp(2rem, 1.5rem + 2vw, 2.8rem); }
.course-hero p { margin: 0; color: var(--text-2); font-size: 1.1rem; }
.course-facts { display: flex; flex-wrap: wrap; gap: 8px; margin: 18px 0 24px; }
.syllabus { counter-reset: lesson; }
.syllabus h2 { font-size: 1.15rem !important; margin: 1.6em 0 .6em !important; }
.syllabus ol { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr)); gap: 8px; }
.syllabus li a, .syllabus li .soon { display: flex; gap: 10px; align-items: baseline; padding: 10px 14px; border: 1px solid var(--border); border-radius: 10px; text-decoration: none; color: var(--text); }
.syllabus li a:hover { border-color: var(--brand); background: var(--bg-soft); }
.syllabus li .soon { color: var(--text-2); }
.syllabus .num { font: 600 12.5px var(--font-mono); color: var(--text-2); min-width: 2ch; }

/* Footer */
.site-footer { border-top: 1px solid var(--border); background: var(--bg-soft); padding: 36px 0 28px; font-size: 14.5px; color: var(--text-2); }
.footer-grid { display: grid; grid-template-columns: 2fr repeat(3, 1fr); gap: 24px; }
.site-footer h2 { font: 700 12px var(--font); text-transform: uppercase; letter-spacing: .08em; color: var(--text); margin: 0 0 10px; }
.site-footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.site-footer a { color: var(--text-2); text-decoration: none; }
.site-footer a:hover { color: var(--text); text-decoration: underline; }
.footer-bottom { margin-top: 26px; padding-top: 18px; border-top: 1px solid var(--border); display: flex; flex-wrap: wrap; justify-content: space-between; gap: 10px; font-size: 13px; }
@media (max-width: 760px) { .footer-grid { grid-template-columns: 1fr 1fr; } .footer-grid > :first-child { grid-column: 1 / -1; } }

/* Search dialog */
dialog.search { width: min(640px, 100% - 24px); max-height: min(560px, 100dvh - 80px); margin: 72px auto auto; padding: 0; border: 1px solid var(--border); border-radius: 16px; background: var(--bg); color: var(--text); box-shadow: 0 24px 60px rgb(0 0 0 / .3); }
dialog.search::backdrop { background: rgb(10 15 25 / .5); }
.search-box { display: flex; align-items: center; gap: 10px; padding: 12px 14px; border-bottom: 1px solid var(--border); }
.search-box input { flex: 1; min-width: 0; border: 0; outline: 0; background: transparent; color: var(--text); font: 500 17px var(--font); }
.search-results { list-style: none; margin: 0; padding: 8px; overflow-y: auto; max-height: 440px; }
.search-results a { display: block; padding: 10px 12px; border-radius: 10px; text-decoration: none; color: var(--text); }
.search-results a:hover, .search-results a.sel { background: var(--bg-muted); }
.search-results small { display: block; color: var(--text-2); font-size: 12.5px; }
.search-empty { padding: 18px; color: var(--text-2); text-align: center; }

/* Forms (enrol page) */
.form-card { max-width: 640px; padding: 26px; border: 1px solid var(--border); border-radius: 16px; background: var(--bg); box-shadow: var(--shadow); }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px 16px; }
.form-grid .full { grid-column: 1 / -1; }
@media (max-width: 560px) { .form-grid { grid-template-columns: 1fr; } }
.field label { display: block; font-weight: 600; font-size: 14.5px; margin-bottom: 6px; }
.field input, .field select, .field textarea { width: 100%; min-height: 44px; padding: 10px 12px; border-radius: 10px; border: 1px solid var(--border); background: var(--bg-soft); color: var(--text); font: 500 15.5px var(--font); }
.field textarea { min-height: 96px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus { outline: 2px solid var(--brand); outline-offset: 1px; background: var(--bg); }
.field .hint { font-size: 13px; color: var(--text-2); margin-top: 4px; }
.flash { padding: 12px 16px; border-radius: 12px; margin: 0 0 18px; font-weight: 600; }
.flash-success { background: var(--tip-bg); color: var(--tip); border: 1px solid color-mix(in srgb, var(--tip) 40%, transparent); }
.flash-error { background: color-mix(in srgb, var(--bad) 10%, var(--bg)); color: var(--bad); border: 1px solid color-mix(in srgb, var(--bad) 40%, transparent); }
.trap { position: absolute; left: -9999px; }
.enroll-layout { display: grid; grid-template-columns: minmax(0, 1fr) 340px; gap: 32px; align-items: start; }
@media (max-width: 960px) { .enroll-layout { grid-template-columns: 1fr; } }
.side-card { padding: 20px; border-radius: 16px; border: 1px solid var(--border); background: var(--bg-soft); }
.side-card h2 { font-size: 1.1rem; margin: 0 0 10px; }
.side-card ul { margin: 0; padding-left: 1.1em; color: var(--text-2); }

/* 404 */
.notfound { padding: 80px 0; text-align: center; }
.notfound h1 { font-size: clamp(2rem, 1.5rem + 2vw, 3rem); margin: 0 0 10px; }

@media (prefers-reduced-motion: reduce) { *, *::before, *::after { transition: none !important; animation: none !important; scroll-behavior: auto !important; } }
@media print { .site-header, .mobile-strip, .sidebar, .toc, .cta-card, .lesson-foot, .site-footer, .code-actions { display: none !important; } .docs { display: block; } }