/* Aleph to Omega. Tokens follow the design system at claude.ai/artifact/Xk5Nuu5hGLsJ8Egp3FMrF7.
   Layout: one centred column (max 1120px) on cool paper; a lapis-deep hero slab on the home page;
   app pages lead with the icon; help pages pair a sticky contents list with a 68ch reading column. */
:root {
  --paper: #f6f7fa;
  --surface: #ffffff;
  --ink: #1b2130;
  --ink-muted: #5a6377;
  --line: #d9dee7;
  --lapis: #2a4b9b;
  --lapis-deep: #17295a;
  --on-lapis: #ffffff;
  --on-lapis-deep: #ffffff;
  --gold: #8a6212;
  --gold-tint: #f3e9d2;
  --lapis-wash: #e6ebf6;

  --font-display: "Frank Ruhl Libre", "Noto Serif Hebrew", Georgia, serif;
  --font-body: Figtree, "Segoe UI", system-ui, sans-serif;
  --font-greek: "Gentium Book Plus", "GFS Didot", "Noto Serif", serif;
  --font-mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;

  --space-1: 4px; --space-2: 8px; --space-3: 12px; --space-4: 16px; --space-6: 24px;
  --space-8: 32px; --space-10: 40px; --space-16: 64px;
  --radius-s: 4px; --radius-m: 10px; --radius-icon: 22.5%;
  --wrap: 1120px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #11141c; --surface: #1a1e29; --ink: #e7eaf1; --ink-muted: #a3abbd; --line: #2c3242;
    --lapis: #8ea7ee; --lapis-deep: #26407f; --on-lapis: #0e1426; --on-lapis-deep: #f1f4fb;
    --gold: #d8b45f; --gold-tint: #2e2717; --lapis-wash: #1d2538;
    color-scheme: dark;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: var(--space-6); }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font: 400 17px/1.6 var(--font-body);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--lapis); text-underline-offset: 0.18em; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--lapis); outline-offset: 3px; border-radius: 2px; }
h1, h2, h3 { font-family: var(--font-display); font-weight: 700; line-height: 1.15; text-wrap: balance; margin: 0; }
p { margin: 0; }
[lang="el"] { font-family: var(--font-greek); }
[lang="he"], [lang="arc"] { font-family: var(--font-display); }
code, kbd { font-family: var(--font-mono); font-size: 0.85em; }

.wrap { max-width: var(--wrap); margin-inline: auto; padding-inline: max(var(--space-4), env(safe-area-inset-left, 0px)); }
@media (min-width: 720px) { .wrap { padding-inline: var(--space-8); } }

.skip { position: absolute; left: -999px; top: var(--space-2); background: var(--surface); padding: var(--space-2) var(--space-4); z-index: 10; }
.skip:focus { left: var(--space-4); }

.label {
  font: 600 12px/16px var(--font-body); letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--ink-muted); margin: 0;
}

/* Header */
.site-header { border-bottom: 1px solid var(--line); background: var(--paper); }
.header-row { display: flex; align-items: center; justify-content: space-between; gap: var(--space-4); padding-block: var(--space-4); flex-wrap: wrap; }
.wordmark { display: inline-flex; align-items: center; gap: var(--space-3); color: var(--ink); text-decoration: none; }
.mark {
  display: inline-flex; align-items: baseline; gap: 2px;
  font-family: var(--font-display); font-weight: 700; font-size: 26px; line-height: 1; color: var(--lapis);
}
.mark [lang="el"] { font-family: var(--font-greek); }
.wordmark-name { font-family: var(--font-display); font-weight: 700; font-size: 21px; letter-spacing: -0.005em; }
.site-nav { display: flex; gap: var(--space-6); }
.site-nav a { color: var(--ink); text-decoration: none; font-weight: 600; font-size: 15px; padding-block: var(--space-1); border-bottom: 2px solid transparent; }
.site-nav a:hover, .site-nav a[aria-current="page"] { border-bottom-color: var(--lapis); }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: var(--space-2);
  font: 600 15px/1 var(--font-body); text-decoration: none;
  padding: 12px 18px; border-radius: var(--radius-s); border: 1px solid var(--lapis);
  background: var(--lapis); color: var(--on-lapis); white-space: nowrap;
}
.btn:hover { filter: brightness(1.08); }
.btn-quiet { background: transparent; color: var(--lapis); }
.btn svg { width: 18px; height: 18px; flex: none; fill: currentColor; }
.btn-row { display: flex; flex-wrap: wrap; gap: var(--space-3); }

/* Home hero */
.hero { background: var(--lapis-deep); color: var(--on-lapis-deep); overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--space-8); padding-block: var(--space-16); position: relative; }
.hero h1 { font-size: clamp(44px, 7vw, 76px); line-height: 0.98; letter-spacing: -0.015em; }
.hero h1 .rule { display: block; width: 72px; height: 3px; background: var(--gold); margin-top: var(--space-6); }
.hero .lede { font-size: 20px; line-height: 1.5; max-width: 34ch; margin-top: var(--space-6); opacity: 0.92; }
.hero-langs { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: var(--space-8); }
.hero-langs a {
  color: var(--on-lapis-deep); text-decoration: none; font-weight: 600; font-size: 15px;
  border: 1px solid rgba(255,255,255,0.35); border-radius: 999px; padding: 8px 16px;
  display: inline-flex; gap: var(--space-2); align-items: baseline;
}
.hero-langs a:hover { background: rgba(255,255,255,0.1); }
.hero-langs .native { opacity: 0.75; font-weight: 500; }
.hero-glyphs { display: none; }
@media (min-width: 880px) {
  .hero-grid { grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); align-items: center; }
  .hero-glyphs {
    display: block; position: relative; height: 340px;
    font-family: var(--font-display); font-weight: 700; line-height: 1; user-select: none;
  }
  .hero-glyphs span { position: absolute; }
  .hero-glyphs .g-aleph { font-size: 320px; left: -10px; top: -70px; color: rgba(255,255,255,0.12); }
  .hero-glyphs .g-omega { font-family: var(--font-greek); font-size: 300px; right: -10px; bottom: 30px; color: var(--gold); opacity: 0.6; }
  .hero-glyphs .g-icons { position: absolute; z-index: 1; left: 36%; top: 58%; transform: translate(-50%, -50%); display: grid; grid-template-columns: repeat(3, 68px); gap: 12px; }
  .hero-glyphs .g-icons img { width: 68px; height: 68px; border-radius: var(--radius-icon); box-shadow: 0 10px 30px rgba(0,0,0,0.35); }
}

/* Sections */
.section { padding-block: var(--space-16); }
.section + .section { border-top: 1px solid var(--line); }
.section-head { display: grid; gap: var(--space-2); margin-bottom: var(--space-8); max-width: 60ch; }
.section-head h2 { font-size: clamp(28px, 4vw, 36px); }
.section-head p { color: var(--ink-muted); }

.lang-group + .lang-group { margin-top: var(--space-10); }
.lang-title { display: flex; align-items: baseline; gap: var(--space-3); margin-bottom: var(--space-4); padding-bottom: var(--space-2); border-bottom: 1px solid var(--line); }
.lang-title h3 { font-size: 24px; }
.lang-title .native { color: var(--ink-muted); font-size: 20px; }

/* App cards */
.app-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 236px), 1fr)); gap: var(--space-4); }
.app-card {
  display: grid; grid-template-columns: 60px minmax(0, 1fr); gap: var(--space-4); align-items: start;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-m);
  padding: var(--space-4); text-decoration: none; color: var(--ink); position: relative;
}
.app-card:hover { border-color: var(--lapis); }
.app-card .icon { width: 60px; height: 60px; border-radius: var(--radius-icon); }
.app-card h4 { font-family: var(--font-display); font-size: 20px; line-height: 1.2; margin: 0; }
.app-card .tagline { color: var(--ink-muted); font-size: 15px; line-height: 1.45; margin-top: var(--space-1); }
.app-card .meta { font-size: 13px; color: var(--ink-muted); margin-top: var(--space-3); display: flex; flex-wrap: wrap; gap: var(--space-1) var(--space-3); }
.badge {
  display: inline-block; font: 600 11px/1 var(--font-body); letter-spacing: 0.06em; text-transform: uppercase;
  padding: 4px 7px; border-radius: var(--radius-s); background: var(--gold-tint); color: var(--ink);
  vertical-align: middle; margin-left: var(--space-2);
}

/* Start here */
.start-here { background: var(--gold-tint); border-radius: var(--radius-m); padding: var(--space-8); display: grid; gap: var(--space-6); }
.start-here h2 { font-size: 28px; }
.paths { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr)); gap: var(--space-6); }
.path h3 { font-size: 20px; margin-bottom: var(--space-3); }
.path ol { margin: 0; padding-left: 1.25em; display: grid; gap: var(--space-2); }
.path li::marker { font-family: var(--font-display); font-weight: 700; color: var(--gold); }

.about-strip { display: grid; gap: var(--space-4); max-width: 68ch; }
.about-strip h2 { font-size: 28px; }

/* App page */
.app-hero { padding-block: var(--space-10) var(--space-10); border-bottom: 1px solid var(--line); }
.app-hero-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--space-6); align-items: center; }
@media (min-width: 720px) { .app-hero-grid { grid-template-columns: 148px minmax(0, 1fr); gap: var(--space-8); } }
.app-hero .icon { width: 112px; height: 112px; border-radius: var(--radius-icon); box-shadow: 0 8px 24px rgba(23,41,90,0.18); }
@media (min-width: 720px) { .app-hero .icon { width: 148px; height: 148px; } }
.app-hero h1 { font-size: clamp(36px, 5vw, 52px); }
.app-hero .tagline { font-size: 20px; color: var(--ink-muted); margin-top: var(--space-2); max-width: 40ch; }
.app-hero .btn-row { margin-top: var(--space-6); }
.app-subnav { display: flex; gap: var(--space-6); flex-wrap: wrap; margin-top: var(--space-6); font-size: 15px; font-weight: 600; }
.app-subnav a { text-decoration: none; }

.app-body { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--space-10); padding-block: var(--space-10); }
@media (min-width: 960px) { .app-body { grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr); gap: var(--space-16); } }
.prose { max-width: 68ch; }
.prose > * + * { margin-top: var(--space-4); }
.prose h2 { font-size: 28px; margin-top: var(--space-10); }
.prose h3 { font-size: 21px; margin-top: var(--space-8); }
.prose h2 + *, .prose h3 + * { margin-top: var(--space-3); }
.prose ul, .prose ol { padding-left: 1.3em; }
.prose li + li { margin-top: var(--space-2); }
.prose strong { font-weight: 600; }
.prose blockquote { margin: 0; padding: var(--space-4) var(--space-6); background: var(--lapis-wash); border-radius: var(--radius-m); }
.prose table { width: 100%; border-collapse: collapse; font-size: 15px; }
.prose th, .prose td { text-align: left; padding: var(--space-2) var(--space-3); border-bottom: 1px solid var(--line); vertical-align: top; }
.prose th { font-weight: 600; }
.table-scroll { overflow-x: auto; }

.panel { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-m); padding: var(--space-6); }
.panel + .panel { margin-top: var(--space-6); }
.panel h2 { font-size: 20px; margin-bottom: var(--space-4); }
.edition { display: grid; gap: var(--space-2); padding-block: var(--space-4); border-top: 1px solid var(--line); }
.edition:first-of-type { border-top: 0; padding-top: 0; }
.edition-head { display: flex; justify-content: space-between; gap: var(--space-3); align-items: baseline; flex-wrap: wrap; }
.edition-name { font-weight: 600; }
.edition-price { font-size: 14px; color: var(--ink-muted); }
.edition p { font-size: 15px; color: var(--ink-muted); }
.store-links { display: flex; flex-wrap: wrap; gap: var(--space-2) var(--space-4); font-size: 15px; font-weight: 600; }
.textbooks { list-style: none; padding: 0; margin: 0; display: grid; gap: var(--space-2); font-size: 15px; }
.textbooks .author { font-weight: 600; }

.features { list-style: none; padding: 0; display: grid; gap: var(--space-4); }
.features li { display: grid; grid-template-columns: 22px minmax(0, 1fr); gap: var(--space-3); }
.features li::before { content: ""; width: 8px; height: 8px; margin-top: 0.62em; margin-left: 6px; background: var(--lapis); transform: rotate(45deg); }

.shots { display: flex; gap: var(--space-4); overflow-x: auto; padding-bottom: var(--space-2); scroll-snap-type: x mandatory; }
.shots img { height: 420px; width: auto; max-width: none; border-radius: var(--radius-m); border: 1px solid var(--line); scroll-snap-align: start; }
@media (max-width: 600px) { .shots img { height: 360px; } }

/* Help and policy pages */
.doc-head { padding-block: var(--space-10) var(--space-6); border-bottom: 1px solid var(--line); }
.crumbs { display: flex; align-items: center; gap: var(--space-3); font-size: 15px; margin-bottom: var(--space-4); }
.crumbs img { width: 36px; height: 36px; border-radius: var(--radius-icon); }
.crumbs a { font-weight: 600; text-decoration: none; }
.doc-head h1 { font-size: clamp(32px, 4.5vw, 44px); }
.doc-head .sub { color: var(--ink-muted); margin-top: var(--space-2); }
.doc { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--space-8); padding-block: var(--space-8) var(--space-16); }
@media (min-width: 960px) { .doc { grid-template-columns: 240px minmax(0, 1fr); gap: var(--space-16); } }
.toc { font-size: 15px; }
@media (min-width: 960px) { .toc { position: sticky; top: var(--space-6); align-self: start; max-height: calc(100vh - 48px); overflow: auto; } }
.toc ol { list-style: none; padding: 0; margin: var(--space-3) 0 0; display: grid; gap: var(--space-2); }
.toc a { color: var(--ink); text-decoration: none; }
.toc a:hover { color: var(--lapis); }
.prose details { border: 1px solid var(--line); border-radius: var(--radius-m); background: var(--surface); padding: var(--space-3) var(--space-4); }
.prose details + details { margin-top: var(--space-2); }
.prose summary { cursor: pointer; font-weight: 600; }
.prose details[open] summary { margin-bottom: var(--space-2); }
.contact-card { margin-top: var(--space-10); }

/* Support index */
.support-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr)); gap: var(--space-4); }
.support-item { display: grid; grid-template-columns: 48px minmax(0, 1fr); gap: var(--space-3); align-items: center; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-m); padding: var(--space-4); }
.support-item img { width: 48px; height: 48px; border-radius: var(--radius-icon); }
.support-item .name { font-weight: 600; }
.support-item .links { font-size: 14px; display: flex; gap: var(--space-4); }

/* Footer */
.site-footer { background: var(--lapis-deep); color: var(--on-lapis-deep); margin-top: var(--space-16); }
.site-footer a { color: var(--on-lapis-deep); text-decoration: none; opacity: 0.9; }
.site-footer a:hover { opacity: 1; text-decoration: underline; }
.site-footer .label { color: var(--on-lapis-deep); opacity: 0.7; margin-bottom: var(--space-3); }
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 200px), 1fr)); gap: var(--space-8); padding-block: var(--space-10); }
.footer-grid ul { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--space-2); font-size: 15px; }
.footer-name { font-family: var(--font-display); font-weight: 700; font-size: 22px; }
.footer-sub { opacity: 0.8; font-size: 15px; margin-top: var(--space-1); }
.footer-base { border-top: 1px solid rgba(255,255,255,0.15); padding-block: var(--space-4); font-size: 14px; opacity: 0.75; }
main + .site-footer { margin-top: 0; }

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

/* Textbook covers */
.books { list-style: none; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(112px, 1fr)); gap: var(--space-6) var(--space-4); }
.prose .books li + li { margin-top: 0; }
.books-single { grid-template-columns: minmax(0, 200px); }
.book { display: grid; gap: var(--space-1); align-content: start; font-size: 13px; line-height: 1.35; }
.book a { display: grid; gap: var(--space-2); text-decoration: none; color: var(--ink); }
.book a:hover .book-title { color: var(--lapis); text-decoration: underline; }
.book img, .book-blank { width: 100%; aspect-ratio: 283 / 360; object-fit: cover; border-radius: 3px; border: 1px solid var(--line); box-shadow: 0 2px 6px rgba(23, 41, 90, 0.12); }
.book-blank { display: grid; place-items: center; padding: var(--space-3); text-align: center; background: var(--lapis-deep); color: var(--on-lapis-deep); font-family: var(--font-display); font-size: 15px; }
.book-title { font-weight: 600; font-size: 14px; }
.book-author { color: var(--ink); }
.book-meta { color: var(--ink-muted); }
.fine { font-size: 14px; color: var(--ink-muted); }

/* Full-width sections below the description and sidebar */
.app-more { padding-bottom: var(--space-16); }
.more-section { border-top: 1px solid var(--line); padding-top: var(--space-8); margin-top: var(--space-8); }
.app-more > .more-section:first-child { margin-top: 0; }
.more-section h2 { font-size: 28px; margin-bottom: var(--space-4); }
.more-section > p { max-width: 68ch; margin-bottom: var(--space-4); }
.more-section .fine { margin-top: var(--space-4); }
.app-more .books { grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); }
.sources-list { margin: 0; padding-left: 1.2em; columns: 2 320px; column-gap: var(--space-10); font-size: 15px; color: var(--ink-muted); }
.sources-list li { break-inside: avoid; margin-bottom: var(--space-2); }
@media (min-width: 960px) { .app-body aside { position: sticky; top: var(--space-6); align-self: start; } }

/* Screenshots inside help guides */
.guide-shot { display: inline-block; vertical-align: top; width: calc(50% - 8px); max-width: 220px; margin: var(--space-3) var(--space-2) var(--space-3) 0; }
.guide-shot img { width: 100%; border-radius: var(--radius-m); border: 1px solid var(--line); }
.prose h2 { clear: both; }
@media (min-width: 720px) {
  .guide-shot { display: block; float: right; clear: right; width: 220px; margin: var(--space-1) 0 var(--space-6) var(--space-8); }
}