/* ─── Reset & Base ─────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/*
 * Accent palette derived from src/gui/icons/matrix.svg (#647F94 / #45596B).
 * Dark theme uses the lighter logo tone as accent (pops on near-black bg);
 * light theme uses the darker logo tone (contrast on near-white bg) — the
 * two exact logo colors simply swap roles between themes.
 */
:root {
  --accent:      #647F94;
  --accent-dk:   #45596B;
  --accent-text: #AEBECB;
  --accent-rgb:  100,127,148;

  --bg:        #0f0f13;
  --bg2:       #16161d;
  --bg3:       #1e1e2a;
  --border:    rgba(255,255,255,0.08);
  --text:      #e2e2ee;
  --muted:     #8888aa;

  --nav-bg:     rgba(15,15,19,.92);
  --chip-bg:    rgba(255,255,255,.07);
  --hover-tint: rgba(255,255,255,.06);
  --overlay-1:  rgba(255,255,255,.02);
  --overlay-2:  rgba(255,255,255,.05);
  --overlay-3:  rgba(255,255,255,.1);
  --download-gradient: linear-gradient(160deg, #0f0f13 0%, #1c242c 100%);
  --mockup-shadow: rgba(0,0,0,.6);

  --green:     #22c55e;
  --red:       #ef4444;
  --yellow:    #eab308;
  --success-text: #4ade80;
  --radius:    10px;
  --font: 'Inter', system-ui, -apple-system, sans-serif;
  --mono: 'JetBrains Mono', 'Fira Mono', 'Cascadia Code', monospace;

  --code-comment: #636e7b;
  --code-keyword: #c792ea;
  --code-fn:      #82aaff;
  --code-string:  #c3e88d;
  --code-number:  #f78c6c;

  color-scheme: dark;
}

/*
 * Theme is resolved once on load (OS preference, unless the visitor has
 * toggled it before) and written to <html data-theme> by an inline script
 * in <head> — see index.html. The toggle button flips this attribute.
 */
:root[data-theme="light"] {
  --accent:      #45596B;
  --accent-dk:   #2E3C48;
  --accent-text: #3A4C5A;
  --accent-rgb:  69,89,107;

  --bg:        #f6f7f9;
  --bg2:       #ffffff;
  --bg3:       #eef1f4;
  --border:    rgba(15,23,32,0.10);
  --text:      #1b222b;
  --muted:     #5b6472;

  --nav-bg:     rgba(255,255,255,.85);
  --chip-bg:    rgba(15,23,32,.06);
  --hover-tint: rgba(15,23,32,.05);
  --overlay-1:  rgba(15,23,32,.025);
  --overlay-2:  rgba(15,23,32,.05);
  --overlay-3:  rgba(15,23,32,.09);
  --download-gradient: linear-gradient(160deg, #ffffff 0%, #eef2f6 100%);
  --mockup-shadow: rgba(15,23,32,.16);

  --success-text: #166534;

  --code-comment: #5b6472;
  --code-keyword: #7c3aed;
  --code-fn:      #0550ae;
  --code-string:  #116329;
  --code-number:  #953800;

  color-scheme: light;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: 16px;
}

a { color: inherit; text-decoration: none; }

/* ─── Buttons ───────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 22px;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all .2s;
  border: none;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: var(--accent-dk); transform: translateY(-1px); }

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-ghost:hover { background: var(--hover-tint); }

.btn-lg { padding: 14px 30px; font-size: 1rem; }

/* ─── Navbar ────────────────────────────────────────────────────────────── */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  gap: 32px;
}
.logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.2rem; }
.logo-mark { width: 30px; height: 30px; flex-shrink: 0; display: block; }
.nav-links { display: flex; gap: 28px; flex: 1; }
.nav-links a { color: var(--muted); font-size: 0.9rem; font-weight: 500; transition: color .2s; }
.nav-links a:hover { color: var(--text); }
.nav-actions { display: flex; align-items: center; gap: 12px; }
.lang-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: 6px;
  padding: 4px 10px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all .2s;
}
.lang-btn:hover, .lang-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }
.theme-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: 6px;
  cursor: pointer;
  transition: all .2s;
}
.theme-btn:hover { color: var(--text); border-color: var(--accent); }
.theme-btn .icon { width: 16px; height: 16px; }
.theme-btn .icon-moon { display: none; }
:root[data-theme="dark"] .theme-btn .icon-sun  { display: none; }
:root[data-theme="dark"] .theme-btn .icon-moon { display: block; }

/* ─── Hero ──────────────────────────────────────────────────────────────── */
.hero {
  padding: 80px 24px 0;
  overflow: hidden;
}
.hero-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}
.hero-badge {
  display: inline-block;
  background: rgba(var(--accent-rgb),.15);
  border: 1px solid rgba(var(--accent-rgb),.4);
  color: var(--accent-text);
  padding: 5px 14px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: .04em;
  margin-bottom: 28px;
}
.hero h1 {
  font-size: clamp(2.4rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -.02em;
  margin-bottom: 20px;
}
.hero h1 em { color: var(--accent); font-style: normal; }
.hero-sub {
  max-width: 580px;
  color: var(--muted);
  font-size: 1.1rem;
  margin-bottom: 36px;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; justify-content: center; margin-bottom: 60px; }

/* ─── Mockup Window ─────────────────────────────────────────────────────── */
.hero-visual { width: 100%; max-width: 800px; }
.mockup-window {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 40px 80px var(--mockup-shadow);
  text-align: left;
}
.mockup-titlebar {
  background: var(--bg3);
  padding: 10px 16px;
  display: flex;
  align-items: center;
  gap: 6px;
  border-bottom: 1px solid var(--border);
}
.dot { width: 12px; height: 12px; border-radius: 50%; }
.dot.red    { background: var(--red); }
.dot.yellow { background: var(--yellow); }
.dot.green  { background: var(--green); }
.mockup-title {
  flex: 1;
  text-align: center;
  font-size: 0.78rem;
  color: var(--muted);
  margin-left: -36px;
}
.mockup-toolbar {
  padding: 8px 14px;
  display: flex;
  align-items: center;
  gap: 4px;
  border-bottom: 1px solid var(--border);
  background: var(--bg3);
}
.tb-btn {
  padding: 4px 10px;
  border-radius: 5px;
  background: var(--overlay-2);
  font-size: 0.8rem;
  cursor: default;
  transition: background .15s;
}
.tb-btn:hover  { background: var(--overlay-3); }
.tb-btn.accent { background: rgba(var(--accent-rgb),.3); color: var(--accent-text); }
.tb-btn.success{ background: rgba(34,197,94,.2); color: var(--success-text); }
.tb-btn .icon  { width: 13px; height: 13px; vertical-align: middle; }
.tb-sep { flex: 0 0 1px; height: 20px; background: var(--border); margin: 0 4px; }
.mockup-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}
.mockup-table th {
  padding: 10px 14px;
  text-align: left;
  color: var(--muted);
  font-weight: 600;
  font-size: 0.78rem;
  letter-spacing: .05em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--border);
  background: var(--overlay-1);
}
.mockup-table td {
  padding: 11px 14px;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}
.mockup-table tr.selected td { background: rgba(var(--accent-rgb),.12); }
.mockup-table tr:last-child td { border-bottom: none; }
.mockup-check { width: 14px; height: 14px; color: var(--success-text); vertical-align: -2px; }
.mockup-status {
  padding: 8px 14px;
  font-size: 0.75rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
  background: var(--bg3);
}

/* ─── Strip ─────────────────────────────────────────────────────────────── */
.strip {
  background: rgba(var(--accent-rgb),.08);
  border-top: 1px solid rgba(var(--accent-rgb),.18);
  border-bottom: 1px solid rgba(var(--accent-rgb),.18);
  padding: 14px 24px;
  margin-top: 60px;
}
.strip-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--muted);
}
.strip-inner .divider { color: var(--border); }
.strip-item { display: inline-flex; align-items: center; gap: 6px; }
.strip-item .icon { width: 15px; height: 15px; color: var(--accent); }

/* ─── Sections ──────────────────────────────────────────────────────────── */
.section { padding: 96px 24px; }
.section-dark { background: var(--bg2); }
.section-alt  { background: var(--bg3); }
.section-inner {
  max-width: 1200px;
  margin: 0 auto;
}
.section-inner h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -.02em;
  margin-bottom: 12px;
  text-align: center;
}
.section-sub {
  color: var(--muted);
  font-size: 1rem;
  text-align: center;
  max-width: 600px;
  margin: 0 auto 56px;
}

/* ─── Features Grid ─────────────────────────────────────────────────────── */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}
.feat-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color .2s, transform .2s;
}
.feat-card:hover { border-color: rgba(var(--accent-rgb),.4); transform: translateY(-2px); }
.feat-icon { margin-bottom: 14px; }
.feat-icon .icon { display: block; width: 30px; height: 30px; color: var(--accent); }
.feat-card h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 8px; }
.feat-card p  { color: var(--muted); font-size: 0.9rem; line-height: 1.6; }
.feat-card code { font-family: var(--mono); font-size: 0.85em; background: var(--chip-bg); padding: 1px 5px; border-radius: 4px; }

/* ─── JavaScript Section ────────────────────────────────────────────────── */
.js-layout { display: grid; grid-template-columns: 1fr 380px; gap: 40px; align-items: start; }
.js-tabs { display: flex; gap: 8px; margin-bottom: 0; grid-column: 1; }
.js-tab {
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--muted);
  padding: 8px 18px;
  border-radius: 8px 8px 0 0;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all .2s;
}
.js-tab.active, .js-tab:hover { background: var(--bg2); color: var(--text); border-bottom-color: var(--bg2); }
.js-panel {
  grid-column: 1;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 0 var(--radius) var(--radius) var(--radius);
  overflow: auto;
}
.js-panel pre { padding: 24px 28px; margin: 0; }
.js-panel code { font-family: var(--mono); font-size: 0.83rem; line-height: 1.75; }
.js-panel.hidden { display: none; }

.js-callouts { grid-column: 2; grid-row: 1 / span 3; display: flex; flex-direction: column; gap: 16px; padding-top: 48px; }
.js-callout {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  display: flex;
  gap: 12px;
  font-size: 0.88rem;
  color: var(--muted);
}
.callout-icon { flex-shrink: 0; }
.callout-icon .icon { width: 20px; height: 20px; color: var(--accent); }
.js-callout code { font-family: var(--mono); font-size: 0.82em; background: var(--chip-bg); padding: 1px 5px; border-radius: 4px; color: var(--accent-text); }

/* Syntax colours */
.cm { color: var(--code-comment); }
.ck { color: var(--code-keyword); }
.cf { color: var(--code-fn); }
.cs { color: var(--code-string); }
.cn { color: var(--code-number); }

/* ─── Use Cases ─────────────────────────────────────────────────────────── */
.cases-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; }
.case-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  transition: border-color .2s;
}
.case-card:hover { border-color: rgba(var(--accent-rgb),.4); }
.case-tag {
  display: inline-block;
  background: rgba(var(--accent-rgb),.15);
  color: var(--accent-text);
  border: 1px solid rgba(var(--accent-rgb),.3);
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: .05em;
  text-transform: uppercase;
  margin-bottom: 12px;
}
.case-card h4 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.case-card p  { color: var(--muted); font-size: 0.88rem; }

/* ─── Platforms ─────────────────────────────────────────────────────────── */
.platforms-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.platforms-text h2 { text-align: left; }
.platforms-text p  { color: var(--muted); margin-bottom: 20px; }
.plat-list { list-style: none; display: flex; flex-direction: column; gap: 10px; margin-bottom: 20px; }
.plat-list li { display: flex; align-items: center; gap: 10px; font-weight: 500; }
.plat-icon .icon { width: 20px; height: 20px; color: var(--accent); }
.plat-note { font-size: 0.85rem; color: var(--muted); border-left: 3px solid var(--accent); padding-left: 12px; }
.platforms-badges { display: flex; flex-direction: column; gap: 16px; }
.plat-badge {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  transition: border-color .2s;
}
.plat-badge:hover { border-color: rgba(var(--accent-rgb),.4); }
.pb-icon .icon { width: 26px; height: 26px; color: var(--accent); }
.pb-label { font-weight: 700; font-size: 1rem; }
.pb-sub { color: var(--muted); font-size: 0.82rem; margin-left: auto; }

/* ─── Download ──────────────────────────────────────────────────────────── */
.download-section { background: var(--download-gradient); }
.download-inner { text-align: center; }
.download-cards { display: flex; gap: 20px; justify-content: center; flex-wrap: wrap; margin: 40px 0 32px; }
.dl-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 32px 28px;
  width: 220px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  transition: all .2s;
}
.dl-card:hover { transform: translateY(-4px); border-color: rgba(var(--accent-rgb),.4); }
.dl-card-featured { border-color: rgba(var(--accent-rgb),.5); background: rgba(var(--accent-rgb),.07); }
.dl-icon   { margin-bottom: 4px; }
.dl-icon .icon { display: block; width: 40px; height: 40px; color: var(--accent); }
.dl-os     { font-size: 1.1rem; font-weight: 700; }
.dl-format { font-size: 0.8rem; color: var(--muted); margin-bottom: 8px; }
.dl-alt    { color: var(--muted); font-size: 0.78rem; text-decoration: underline; margin-top: 2px; }
.dl-alt:hover { color: var(--accent); }
.dl-source { color: var(--muted); font-size: 0.85rem; }
.dl-source a { color: var(--accent); text-decoration: underline; }

/* ─── Footer ────────────────────────────────────────────────────────────── */
.footer { background: var(--bg2); border-top: 1px solid var(--border); padding: 40px 24px; text-align: center; }
.footer-inner { max-width: 1200px; margin: 0 auto; display: flex; flex-direction: column; align-items: center; gap: 8px; }
.footer p    { color: var(--muted); font-size: 0.85rem; }
.footer-copy { font-size: 0.78rem !important; }

/* ─── Responsive ────────────────────────────────────────────────────────── */
@media (max-width: 900px) {
  .js-layout      { grid-template-columns: 1fr; }
  .js-callouts    { grid-column: 1; grid-row: auto; padding-top: 0; }
  .platforms-inner{ grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .nav-links  { display: none; }
  .hero h1    { font-size: 2rem; }
  .js-tabs    { flex-wrap: wrap; }
}