/* Layout uses logical properties only (inline/block, start/end) so RTL mirrors automatically. */
:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-2: #eef1f5;
  --text: #16202b;
  --muted: #5a6776;
  --border: #dde2e8;
  --primary: #1d4e89;
  --primary-strong: #163d6c;
  --primary-soft: #e6eef8;
  --on-primary: #ffffff;
  --success: #1f7a4d;
  --success-soft: #e3f3ea;
  --focus: #f0a500;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 2px rgb(16 24 40 / 6%), 0 4px 16px rgb(16 24 40 / 6%);
  --paper: #f7f5f0;
  --paper-line: rgb(29 78 137 / 7%);
  --header-h: 64px;
  --font: "Rubik", system-ui, -apple-system, "Segoe UI", Arial, sans-serif;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1319;
    --surface: #161d25;
    --surface-2: #1e2731;
    --text: #e7edf3;
    --muted: #9aa8b7;
    --border: #2a3542;
    --primary: #6aa7ec;
    --primary-strong: #8dbcf2;
    --primary-soft: #1a2c42;
    --on-primary: #0b1520;
    --success: #4cc38a;
    --success-soft: #16301f;
    --shadow: 0 1px 2px rgb(0 0 0 / 30%), 0 4px 16px rgb(0 0 0 / 25%);
    --paper: #151c24;
    --paper-line: rgb(255 255 255 / 5%);
    color-scheme: dark;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  display: flex;
  flex-direction: column;
  min-block-size: 100vh;
}
main { flex: 1; outline: none; }
h1, h2, h3, h4 { line-height: 1.25; margin-block: 0 0.5em; font-weight: 600; }
h1 { font-size: clamp(1.75rem, 1.3rem + 2vw, 2.6rem); }
h2 { font-size: 1.45rem; }
h3 { font-size: 1.15rem; }
.h4, h4 { font-size: 1rem; }
p { margin-block: 0 1em; }
a { color: var(--primary); text-underline-offset: 3px; }
a:hover { color: var(--primary-strong); }
img { max-inline-size: 100%; display: block; }
h1:focus { outline: none; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; border-radius: 4px; }

.container { inline-size: min(1200px, 100%); margin-inline: auto; padding-inline: 16px; }
@media (min-width: 640px) { .container { padding-inline: 24px; } }
.section { padding-block: 32px; }
.muted { color: var(--muted); }
.small { font-size: 0.875rem; }
.lead { font-size: 1.125rem; }
.eyebrow { font-size: 0.78rem; font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase; color: var(--muted); margin: 0; }
.visually-hidden { position: absolute; inline-size: 1px; block-size: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }

.icon { inline-size: 1.15em; block-size: 1.15em; flex: none; vertical-align: -0.2em; }
[dir="rtl"] .flip-rtl { transform: scaleX(-1); }

.skip-link {
  position: absolute; inset-inline-start: 16px; inset-block-start: -100px; z-index: 100;
  background: var(--primary); color: var(--on-primary); padding: 8px 16px; border-radius: var(--radius-sm);
}
.skip-link:focus { inset-block-start: 12px; }

/* Header */
.site-header {
  position: sticky; inset-block-start: 0; z-index: 20;
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  backdrop-filter: blur(8px);
  border-block-end: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; block-size: var(--header-h); }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 700; font-size: 1.1rem; }
.brand-mark {
  inline-size: 30px; block-size: 30px; border-radius: 8px;
  background: linear-gradient(135deg, #1d4e89, #2a9d8f);
}
.header-nav { display: flex; align-items: center; gap: 16px; }
.header-nav > a { color: var(--text); text-decoration: none; font-weight: 500; }
.header-nav > a:hover { color: var(--primary); }
@media (max-width: 480px) { .header-nav > a { display: none; } .brand-name { font-size: 1rem; } }
.lang-switch { display: flex; border: 1px solid var(--border); border-radius: 999px; padding: 2px; background: var(--surface-2); }
.lang-switch button {
  font: inherit; font-size: 0.85rem; border: 0; background: none; color: var(--muted);
  padding: 4px 12px; border-radius: 999px; cursor: pointer; min-block-size: 32px;
}
.lang-switch button[aria-pressed="true"] { background: var(--surface); color: var(--text); font-weight: 600; box-shadow: var(--shadow); }

/* Buttons & tags */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font: inherit; font-weight: 500; text-decoration: none; cursor: pointer;
  min-block-size: 44px; padding: 8px 18px; border-radius: 999px; border: 1px solid transparent;
  transition: background-color 0.15s, color 0.15s, border-color 0.15s;
}
.btn-sm { min-block-size: 36px; padding: 4px 14px; font-size: 0.9rem; }
.btn-primary { background: var(--primary); color: var(--on-primary); }
.btn-primary:hover { background: var(--primary-strong); color: var(--on-primary); }
.btn-ghost { background: var(--surface); color: var(--text); border-color: var(--border); }
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); }
.btn-light { background: #fff; color: #163d6c; }
.btn-light:hover { background: #eef4fb; color: #163d6c; }
.btn-done { background: var(--success-soft); color: var(--success); border-color: var(--success); }
.btn-icon { border: 0; background: none; color: var(--muted); cursor: pointer; padding: 8px; border-radius: var(--radius-sm); font-size: 1.1rem; }
.tag {
  display: inline-flex; align-items: center; gap: 4px; white-space: nowrap;
  font-size: 0.75rem; font-weight: 500; padding: 1px 8px; border-radius: 999px;
  background: var(--primary-soft); color: var(--primary); margin-inline-start: 6px;
}
.tag-muted { background: var(--surface-2); color: var(--muted); }
.tag-type { margin-inline-start: 0; }

.progress { block-size: 6px; background: var(--surface-2); border-radius: 999px; overflow: hidden; margin-block: 8px 4px; }
.progress span { display: block; block-size: 100%; background: var(--success); border-radius: inherit; }

.meta { list-style: none; padding: 0; margin: 12px 0 0; display: flex; flex-wrap: wrap; gap: 6px 16px; color: var(--muted); font-size: 0.9rem; }
.meta li { display: inline-flex; align-items: center; gap: 6px; }

/* Home */
.hero { background: linear-gradient(135deg, #1d4e89, #1f6f8b 55%, #2a9d8f); color: #fff; }
.hero-inner { padding-block: 64px 72px; max-inline-size: 760px; margin-inline: 0; }
@media (min-width: 1200px) { .hero-inner { margin-inline: calc((100vw - 1200px) / 2); } }
.hero .lead { color: rgb(255 255 255 / 88%); margin-block-end: 28px; }
.hero .btn-primary { background: #fff; color: #163d6c; }

.course-grid { list-style: none; padding: 0; margin: 0; display: grid; gap: 20px; grid-template-columns: repeat(auto-fill, minmax(min(100%, 320px), 1fr)); }
.course-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); transition: transform 0.15s, box-shadow 0.15s; }
.course-card:has(a:hover) { transform: translateY(-2px); }
.card-link { display: block; color: inherit; text-decoration: none; block-size: 100%; }
.card-link:hover h3 { color: var(--primary); }
.card-body { padding: 18px 20px 20px; }
.card-body h3 { margin-block: 4px 6px; }
.coming-soon { display: grid; place-items: center; text-align: center; background: transparent; border-style: dashed; box-shadow: none; min-block-size: 200px; }

.cover {
  display: grid; place-items: center; aspect-ratio: 16 / 7; color: rgb(255 255 255 / 92%);
  background: radial-gradient(circle at 80% 20%, rgb(255 255 255 / 18%), transparent 45%), linear-gradient(135deg, var(--from), var(--to));
}
.cover-icon { inline-size: 64px; block-size: 64px; stroke-width: 1.2; }
.cover-lg { aspect-ratio: 4 / 3; border-radius: var(--radius); box-shadow: 0 10px 40px rgb(0 0 0 / 25%); }
.cover-lg .cover-icon { inline-size: 96px; block-size: 96px; }

/* Course page */
.course-hero { background: linear-gradient(135deg, var(--from, #1d4e89), var(--to, #2a9d8f)); color: #fff; }
.course-hero-inner { display: grid; gap: 32px; padding-block: 40px 48px; align-items: center; }
@media (min-width: 900px) { .course-hero-inner { grid-template-columns: 1fr 340px; padding-block: 56px; } }
@media (max-width: 899px) { .course-hero .cover-lg { display: none; } }
.course-hero .lead { color: rgb(255 255 255 / 90%); }
.breadcrumb a { color: rgb(255 255 255 / 85%); font-size: 0.9rem; }
.meta-light { color: rgb(255 255 255 / 88%); }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 16px 24px; margin-block-start: 24px; }
.hero-progress { display: flex; align-items: center; gap: 12px; font-size: 0.9rem; }
.hero-progress .progress { inline-size: 160px; background: rgb(255 255 255 / 25%); margin: 0; }
.hero-progress .progress span { background: #fff; }

.course-layout { display: grid; gap: 8px 40px; }
@media (min-width: 900px) { .course-layout { grid-template-columns: 1fr 300px; } }
.course-aside { padding-block: 32px; }
@media (min-width: 900px) { .course-aside .panel { position: sticky; inset-block-start: calc(var(--header-h) + 24px); } }
.panel { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; }
.panel .h4 { margin-block: 0 8px; color: var(--muted); font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.04em; }
.panel .h4:not(:first-child) { margin-block-start: 20px; }
.instructor { display: flex; align-items: center; gap: 10px; font-weight: 600; margin-block-end: 4px; }
.check-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
@media (min-width: 640px) { .check-list { grid-template-columns: 1fr 1fr; } }
.check-list li { display: flex; gap: 10px; align-items: flex-start; }
.check-list .icon { color: var(--success); margin-block-start: 0.2em; }
.section-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-block-end: 12px; }
.section-head h2 { margin: 0; }

/* Modules (accordion) */
.module-list { display: grid; gap: 10px; }
.module, .outline-module { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); }
.module > summary, .outline-module > summary {
  list-style: none; cursor: pointer; display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 14px 18px; border-radius: var(--radius);
}
.module > summary::-webkit-details-marker, .outline-module > summary::-webkit-details-marker { display: none; }
.module > summary:hover .module-title { color: var(--primary); }
.module-head { display: grid; gap: 2px; }
.module-title { font-weight: 600; font-size: 1.05rem; }
.chevron { color: var(--muted); transition: transform 0.2s; }
details[open] > summary .chevron { transform: rotate(180deg); }
.module-body { padding: 0 18px 18px; }
.materials-heading { margin-block: 18px 8px; font-size: 0.95rem; }

.step-list { list-style: none; padding: 0; margin: 0; }
.step-row, .outline-step {
  display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 12px;
  padding: 9px 10px; border-radius: var(--radius-sm); color: var(--text); text-decoration: none;
}
.step-row:hover, .outline-step:hover { background: var(--surface-2); color: var(--text); }
.step-icon {
  display: grid; place-items: center; inline-size: 30px; block-size: 30px; border-radius: 50%;
  background: var(--surface-2); color: var(--muted);
}
.is-done .step-icon { background: var(--success-soft); color: var(--success); }
.step-meta { font-size: 0.82rem; color: var(--muted); font-variant-numeric: tabular-nums; }

.file-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 6px; }
.file-row {
  display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 12px;
  padding: 8px 10px; border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--surface);
}
.file-type {
  font-size: 0.7rem; font-weight: 700; letter-spacing: 0.03em; min-inline-size: 44px; text-align: center;
  padding: 4px 6px; border-radius: 6px; background: var(--primary-soft); color: var(--primary);
}
.file-name { display: grid; line-height: 1.3; overflow-wrap: anywhere; }
.file-name small { color: var(--muted); }
.file-row .tag { margin: 0; }

/* Learn view */
.learn { display: grid; min-block-size: calc(100vh - var(--header-h)); }
@media (min-width: 1024px) { .learn { grid-template-columns: 360px 1fr; } }
.outline {
  background: var(--surface); border-inline-end: 1px solid var(--border);
  overflow-y: auto; overscroll-behavior: contain; padding: 16px 12px 32px;
}
@media (min-width: 1024px) {
  .outline { position: sticky; inset-block-start: var(--header-h); block-size: calc(100vh - var(--header-h)); }
  .outline-close, .outline-open, .outline-backdrop { display: none !important; }
}
.outline-head { position: relative; padding: 4px 8px 12px; border-block-end: 1px solid var(--border); margin-block-end: 12px; }
.outline-course { display: block; font-weight: 600; color: var(--text); text-decoration: none; padding-inline-end: 36px; }
.outline-close { position: absolute; inset-inline-end: 0; inset-block-start: 0; }
.outline nav { display: grid; gap: 8px; }
.outline-module > summary { padding: 10px 12px; }
.outline-module .module-title { font-size: 0.95rem; }
.outline-module .step-list { padding: 0 6px 8px; }
.outline-step { padding: 7px 8px; font-size: 0.92rem; }
.outline-step .step-icon { inline-size: 26px; block-size: 26px; font-size: 0.85rem; }
.outline-step.is-current { background: var(--primary-soft); color: var(--primary); font-weight: 500; }
.outline-step.is-current .step-icon { background: var(--primary); color: var(--on-primary); }

/* Mobile drawer; --dir flips the slide direction in RTL. */
:root { --dir: 1; }
[dir="rtl"] { --dir: -1; }
@media (max-width: 1023px) {
  .outline {
    position: fixed; z-index: 40; inset-block: 0; inset-inline-start: 0; inline-size: min(360px, 88vw);
    transform: translateX(calc(var(--dir) * -105%)); box-shadow: var(--shadow);
    visibility: hidden; transition: transform 0.25s ease, visibility 0s linear 0.25s;
  }
  .outline-is-open .outline { transform: none; visibility: visible; transition: transform 0.25s ease; }
  .outline-backdrop { position: fixed; inset: 0; z-index: 30; background: rgb(0 0 0 / 45%); opacity: 0; pointer-events: none; transition: opacity 0.25s; }
  .outline-is-open .outline-backdrop { opacity: 1; pointer-events: auto; }
}

.viewer { padding: 16px 16px 48px; inline-size: min(1000px, 100%); margin-inline: auto; }
@media (min-width: 640px) { .viewer { padding: 24px 32px 64px; } }
.viewer-bar { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-block-end: 16px; min-block-size: 36px; }
@media (min-width: 1024px) { .viewer-bar { justify-content: flex-end; } }

.player { position: relative; aspect-ratio: 16 / 9; background: #000; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.player iframe, .player-poster { position: absolute; inset: 0; inline-size: 100%; block-size: 100%; border: 0; }
.player-poster { padding: 0; cursor: pointer; background: #000; }
.player-poster img { inline-size: 100%; block-size: 100%; object-fit: cover; opacity: 0.85; transition: opacity 0.2s; }
.player-poster:hover img { opacity: 1; }
.play-button {
  position: absolute; inset: 0; margin: auto; inline-size: 76px; block-size: 76px; border-radius: 50%;
  display: grid; place-items: center; background: rgb(0 0 0 / 65%); color: #fff; font-size: 2rem;
  transition: transform 0.15s, background-color 0.15s;
}
.player-poster:hover .play-button, .player-poster:focus-visible .play-button { background: #e62117; transform: scale(1.06); }
.play-button .icon { margin-inline-start: 4px; }

.stage-card {
  display: grid; justify-items: center; text-align: center; gap: 8px; padding: 40px 24px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
}
.stage-card p { max-inline-size: 60ch; }
.stage-icon { display: grid; place-items: center; inline-size: 56px; block-size: 56px; border-radius: 50%; background: var(--primary-soft); color: var(--primary); font-size: 1.5rem; margin-block-end: 8px; }
.stage-exercise { text-align: start; justify-items: start; }

.item-head { margin-block: 24px 16px; }
.item-head h1 { font-size: clamp(1.4rem, 1.1rem + 1.2vw, 2rem); margin-block: 4px 8px; }
.item-tags { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin: 0; }
.item-tags .tag { margin: 0; }
.item-actions {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px;
  padding-block: 16px; border-block: 1px solid var(--border);
}
@media (max-width: 639px) {
  .item-actions { display: grid; grid-template-columns: 1fr 1fr; }
  .item-actions [data-toggle-done] { grid-column: 1 / -1; order: -1; }
  .item-actions .finished { grid-column: 2; }
}
.finished { margin: 0; font-weight: 600; color: var(--success); }
.materials { margin-block-start: 28px; }

/* Footer */
.site-footer { border-block-start: 1px solid var(--border); background: var(--surface); color: var(--muted); font-size: 0.9rem; }
.footer-inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 24px; padding-block: 24px; }
.footer-inner p { margin: 0; }
body[data-view="learn"] .site-footer { display: none; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; scroll-behavior: auto !important; }
}

/* Blueprint grid behind the colored hero bands */
.hero, .course-hero, .page-hero { position: relative; isolation: isolate; overflow: hidden; }
.hero::before, .course-hero::before, .page-hero::before {
  content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background-image:
    linear-gradient(rgb(255 255 255 / 7%) 1px, transparent 1px),
    linear-gradient(90deg, rgb(255 255 255 / 7%) 1px, transparent 1px),
    linear-gradient(rgb(255 255 255 / 4%) 1px, transparent 1px),
    linear-gradient(90deg, rgb(255 255 255 / 4%) 1px, transparent 1px);
  background-size: 96px 96px, 96px 96px, 24px 24px, 24px 24px;
  mask-image: linear-gradient(to bottom, #000 30%, transparent);
}
/* How it works */
.how { padding-block: 40px 8px; }
.how-steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr)); }
.how-step { position: relative; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; }
.how-step h3 { margin-block: 12px 4px; font-size: 1.05rem; }
.how-step p { margin: 0; font-size: 0.95rem; }
.how-icon { display: grid; place-items: center; inline-size: 44px; block-size: 44px; border-radius: 12px; background: var(--primary-soft); color: var(--primary); font-size: 1.3rem; }
.how-num { position: absolute; inset-block-start: 14px; inset-inline-end: 18px; font-size: 2rem; font-weight: 700; color: var(--surface-2); line-height: 1; }

/* Cover images */
.cover.has-image { background: var(--surface-2); padding: 0; }
.cover.has-image img { inline-size: 100%; block-size: 100%; object-fit: cover; }
.cover-lg.has-image { overflow: hidden; }

/* Project card (course page) */
.course-aside { display: grid; gap: 16px; align-content: start; }
@media (min-width: 900px) { .course-aside { position: sticky; inset-block-start: calc(var(--header-h) + 24px); align-self: start; } .course-aside .panel { position: static; } }
.project-card { display: grid; gap: 4px; text-decoration: none; color: var(--text); border-color: color-mix(in srgb, var(--primary) 35%, var(--border));
  background: linear-gradient(160deg, var(--primary-soft), var(--surface) 70%); }
.project-card strong { font-size: 1.15rem; }
.project-card-cta { display: inline-flex; align-items: center; gap: 6px; margin-block-start: 8px; color: var(--primary); font-weight: 500; }
.project-card:hover { border-color: var(--primary); color: var(--text); }

/* Project brief page */
.page-hero { background: linear-gradient(135deg, #1d4e89, #1f6f8b 55%, #2a9d8f); color: #fff; padding-block: 40px 48px; }
.page-hero .lead { color: rgb(255 255 255 / 90%); max-inline-size: 70ch; margin: 0; }
.brief-layout { display: grid; gap: 32px; padding-block: 32px 56px; align-items: start; }
@media (min-width: 960px) { .brief-layout { grid-template-columns: 360px 1fr; } .brief-site { position: sticky; inset-block-start: calc(var(--header-h) + 24px); } }
.brief-site h2 { font-size: 1.2rem; }
.plot { inline-size: 100%; block-size: auto; margin-block: 8px 16px; font-family: var(--font); font-size: 13px; fill: var(--muted); }
.plot-land { fill: color-mix(in srgb, var(--success) 12%, var(--surface)); stroke: var(--success); stroke-width: 2; }
.plot-build { fill: var(--primary-soft); stroke: var(--primary); stroke-width: 1.5; stroke-dasharray: 6 4; }
.plot-area { fill: var(--primary); font-weight: 600; font-size: 16px; }
.plot-small { font-size: 11px; }
[dir="rtl"] .plot text { direction: ltr; }
.check-list.single { grid-template-columns: 1fr; font-size: 0.95rem; }
.bullets { margin: 0; padding-inline-start: 1.2em; display: grid; gap: 6px; font-size: 0.95rem; }
.brief-stages { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.brief-stage { display: grid; grid-template-columns: 44px 1fr; gap: 14px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; scroll-margin-block-start: calc(var(--header-h) + 16px); }
.brief-stage.is-target { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft); }
.brief-num { display: grid; place-items: center; inline-size: 40px; block-size: 40px; border-radius: 50%; background: var(--primary); color: var(--on-primary); font-weight: 700; }
.brief-body h3 { margin-block: 6px 2px; }
.brief-body > p.small { margin-block-end: 10px; }

/* Requirement checklists (brief page + exercise view) */
.req-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 4px; inline-size: 100%; }
.req { display: flex; gap: 10px; align-items: flex-start; padding: 6px 8px; border-radius: var(--radius-sm); cursor: pointer; }
.req:hover { background: var(--surface-2); }
.req input { inline-size: 18px; block-size: 18px; margin-block-start: 0.2em; flex: none; accent-color: var(--success); }
.req input:checked + span { color: var(--muted); text-decoration: line-through; text-decoration-color: color-mix(in srgb, var(--muted) 50%, transparent); }
.note { margin: 10px 0 0; padding: 10px 14px; border-radius: var(--radius-sm); background: var(--primary-soft); color: var(--text); font-size: 0.92rem; border-inline-start: 3px solid var(--primary); }
.stage-exercise { gap: 12px; }

/* Sign-in (downloads only) */
.user-slot { display: flex; align-items: center; gap: 8px; }
.user-slot:empty { display: none; }
.user-chip { font-size: 0.85rem; color: var(--muted); max-inline-size: 180px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
@media (max-width: 640px) { .user-chip { display: none; } }
.signin-box {
  display: grid; gap: 10px; margin-block-start: 10px; padding: 14px 16px;
  border: 1px dashed var(--border); border-radius: var(--radius-sm); background: var(--surface-2);
}
.signin-box p { margin: 0; font-size: 0.92rem; }
.signin-row { display: flex; flex-wrap: wrap; gap: 8px; }
.signin-row input {
  flex: 1 1 220px; min-block-size: 40px; padding: 6px 14px; font: inherit; color: var(--text);
  background: var(--surface); border: 1px solid var(--border); border-radius: 999px;
}
.signin-row input:focus-visible { outline: 3px solid var(--focus); outline-offset: 1px; }
.signin-msg:empty { display: none; }
.signin-msg { color: var(--success); }
.signin-msg.is-error { color: #c0392b; }

.footer-links { display: flex; gap: 16px; flex-wrap: wrap; }
.legal { max-inline-size: 760px; }
.legal h2 { font-size: 1.2rem; margin-block-start: 1.6em; }
.legal li { margin-block-end: 0.5em; }

/* Imagery */
.hero-grid { display: grid; gap: 24px; align-items: center; padding-block: 48px 40px; }
@media (min-width: 900px) { .hero-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); padding-block: 40px; } }
.hero-text { max-inline-size: 600px; }
.hero-illustration { inline-size: 100%; block-size: auto; max-inline-size: 640px; justify-self: center; }
@media (max-width: 899px) { .hero-illustration { max-inline-size: 420px; margin-block-start: -8px; } }

.showcase { list-style: none; margin: 0; padding: 0; display: grid; gap: 16px; grid-template-columns: repeat(auto-fill, minmax(min(100%, 240px), 1fr)); }
.showcase a { display: block; border-radius: var(--radius); overflow: hidden; text-decoration: none; color: var(--text); background: var(--surface); border: 1px solid var(--border); }
.showcase a:hover { border-color: var(--primary); color: var(--text); }
.showcase img { display: block; inline-size: 100%; block-size: auto; aspect-ratio: 16 / 10; object-fit: cover; transition: transform 0.4s ease; }
.showcase a:hover img { transform: scale(1.03); }
.showcase-caption { display: grid; gap: 2px; padding: 10px 14px 14px; border-block-start: 1px solid var(--border); }

.module > summary { justify-content: flex-start; }
.module > summary .chevron { margin-inline-start: auto; }
.module-thumb { inline-size: 96px; block-size: auto; aspect-ratio: 16 / 10; object-fit: cover; border-radius: 8px; flex: none; border: 1px solid var(--border); }
@media (max-width: 520px) { .module-thumb { inline-size: 64px; } }

.page-hero-grid { display: grid; gap: 24px; align-items: center; }
@media (min-width: 900px) { .page-hero-grid { grid-template-columns: 1fr 380px; } }
.page-hero-image { inline-size: 100%; block-size: auto; border-radius: var(--radius); box-shadow: 0 10px 40px rgb(0 0 0 / 25%); }
@media (max-width: 899px) { .page-hero-image { display: none; } }

.code {
  inline-size: 100%; max-block-size: 320px; overflow: auto; margin: 0; padding: 14px 16px; text-align: start;
  font: 0.85rem/1.5 ui-monospace, "Cascadia Code", Consolas, monospace; background: var(--surface-2);
  border: 1px solid var(--border); border-radius: var(--radius-sm); white-space: pre;
}