/* ============================================================
   Node Bridge — project site
   Aesthetic: "engineering index" — monospace labels, hairline
   borders, a single indigo accent, token-driven dual theme.
   Palette aligned with fellow99.github.io / dsh-desktop-website.
   No frameworks, no external requests, offline-safe.
   ============================================================ */

/* ---------- Design tokens: light (default) ---------- */
:root {
  color-scheme: light;
  --bg:          #f5f6fa;
  --bg-soft:     #eceef6;
  --surface:     #ffffff;
  --surface-2:   #f8f9fc;
  --text:        #14161c;
  --muted:       #565d6e;
  --faint:       #868da0;
  --hairline:    #e3e6ef;
  --hairline-strong: #d2d7e4;

  --accent:        #4b5cf6;
  --accent-strong: #3a4ae0;
  --accent-ink:    #ffffff;
  --accent-soft:   #eceefe;
  --accent-line:   rgba(75, 92, 246, 0.42);
  --glow:          rgba(75, 92, 246, 0.16);
  --grid:          rgba(20, 24, 50, 0.045);
  --header-bg:     rgba(245, 246, 250, 0.82);

  /* platform semantic hues (used sparingly: dot + small label) */
  --android:       #23915a;
  --android-soft:  #e6f5ec;
  --harmony:       #0e83a8;
  --harmony-soft:  #e3f3f9;

  --shadow-sm: 0 1px 2px rgba(16, 20, 40, 0.06);
  --shadow-md: 0 10px 30px -16px rgba(16, 20, 40, 0.28);
  --shadow-lg: 0 28px 64px -30px rgba(16, 20, 40, 0.36);
  --code-shadow: 0 18px 42px -18px rgba(16, 20, 40, 0.28);

  --radius:    16px;
  --radius-sm: 11px;
  --radius-xs: 8px;
  --radius-lg: 20px;
  --header-h:  62px;
  --container: 1180px;
  --ease:      cubic-bezier(0.22, 0.61, 0.36, 1);

  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue",
               "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
               "Cascadia Code", "JetBrains Mono", "Fira Code", "Courier New", monospace;
}

/* ---------- Design tokens: dark ---------- */
html[data-theme="dark"] {
  color-scheme: dark;
  --bg:          #08090d;
  --bg-soft:     #0d0f16;
  --surface:     #101319;
  --surface-2:   #151922;
  --text:        #eceef4;
  --muted:       #9aa1b2;
  --faint:       #6b7286;
  --hairline:    #20242f;
  --hairline-strong: #2e3646;

  --accent:        #8290ff;
  --accent-strong: #95a7ff;
  --accent-ink:    #0a0b10;
  --accent-soft:   #161a29;
  --accent-line:   rgba(130, 144, 255, 0.48);
  --glow:          rgba(130, 144, 255, 0.20);
  --grid:          rgba(255, 255, 255, 0.035);
  --header-bg:     rgba(8, 9, 13, 0.78);

  --android:       #46c987;
  --android-soft:  #12241b;
  --harmony:       #44c6e6;
  --harmony-soft:  #0f242c;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.45);
  --shadow-md: 0 12px 32px -16px rgba(0, 0, 0, 0.72);
  --shadow-lg: 0 32px 72px -32px rgba(0, 0, 0, 0.9);
  --code-shadow: 0 22px 48px -20px rgba(0, 0, 0, 0.75);
}

/* no-JS fallback: mirror the dark token set from the OS preference. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    color-scheme: dark;
    --bg:#08090d; --bg-soft:#0d0f16; --surface:#101319; --surface-2:#151922;
    --text:#eceef4; --muted:#9aa1b2; --faint:#6b7286; --hairline:#20242f;
    --hairline-strong:#2e3646;
    --accent:#8290ff; --accent-strong:#95a7ff; --accent-ink:#0a0b10;
    --accent-soft:#161a29; --accent-line:rgba(130,144,255,.48);
    --glow:rgba(130,144,255,.20); --grid:rgba(255,255,255,.035);
    --header-bg:rgba(8,9,13,.78);
    --android:#46c987; --android-soft:#12241b;
    --harmony:#44c6e6; --harmony-soft:#0f242c;
    --shadow-sm:0 1px 2px rgba(0,0,0,.45);
    --shadow-md:0 12px 32px -16px rgba(0,0,0,.72);
    --shadow-lg:0 32px 72px -32px rgba(0,0,0,.9);
    --code-shadow:0 22px 48px -20px rgba(0,0,0,.75);
  }
}

/* ---------- Reset & base ---------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 20px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background-color 0.3s var(--ease), color 0.3s var(--ease);
}

h1, h2, h3, p, ul, ol, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg { display: block; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

code, pre { font-family: var(--font-mono); }

::selection { background: var(--accent); color: var(--accent-ink); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: 12px; top: -60px;
  z-index: 200;
  padding: 0.55rem 1rem;
  background: var(--accent);
  color: var(--accent-ink);
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: 0 0 var(--radius-xs) var(--radius-xs);
  transition: top 0.2s var(--ease);
}
.skip-link:focus { top: 0; }

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 24px;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-h);
  border-bottom: 1px solid var(--hairline);
  background: var(--header-bg);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  backdrop-filter: saturate(180%) blur(14px);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 20px;
  height: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 650;
  letter-spacing: -0.01em;
  white-space: nowrap;
}
.brand:hover { text-decoration: none; }
.brand-logo { width: 30px; height: 30px; border-radius: 8px; flex: none; }
.brand-name { font-size: 16px; }
.brand-by {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--faint);
  border-left: 1px solid var(--hairline);
  padding-left: 10px;
}

.nav { display: flex; gap: 4px; margin-left: 8px; }
.nav a {
  color: var(--muted);
  font-size: 14px;
  padding: 7px 11px;
  border-radius: 8px;
  transition: color 0.2s var(--ease), background-color 0.2s var(--ease);
}
.nav a:hover { color: var(--text); background: var(--surface-2); text-decoration: none; }
.nav a.is-active { color: var(--accent); background: var(--accent-soft); }

.controls { display: flex; align-items: center; gap: 10px; margin-left: auto; }

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-family: var(--font-mono);
  font-size: 13px;
  border: 1px solid var(--hairline);
  border-radius: 999px;
  padding: 4px 6px;
  background: var(--surface);
}
.lang {
  color: var(--muted);
  padding: 2px 8px;
  border-radius: 999px;
  transition: color 0.2s var(--ease), background-color 0.2s var(--ease);
}
.lang:hover { color: var(--text); text-decoration: none; }
.lang.is-active { color: var(--accent-ink); background: var(--accent); }
.lang-sep { color: var(--faint); }

.theme-toggle {
  display: inline-grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--hairline);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}
.theme-toggle:hover { border-color: var(--accent-line); transform: translateY(-1px); }
.theme-toggle svg { width: 17px; height: 17px; }
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }
html[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
html[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(64px, 10vw, 128px) 0 clamp(48px, 7vw, 84px);
}
.hero::before {
  content: "";
  position: absolute;
  inset: -50% 0 auto;
  height: 150%;
  background: radial-gradient(58% 56% at 50% 34%, var(--glow), transparent 70%);
  pointer-events: none;
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(72% 62% at 50% 22%, #000, transparent 74%);
  mask-image: radial-gradient(72% 62% at 50% 22%, #000, transparent 74%);
  pointer-events: none;
}
.hero-inner { position: relative; z-index: 1; max-width: 880px; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--accent);
  margin-bottom: 16px;
}
.eyebrow::before { content: "$ "; }

.hero-title {
  font-size: clamp(40px, 7.2vw, 68px);
  line-height: 1.04;
  letter-spacing: -0.035em;
  font-weight: 750;
  text-wrap: balance;
}
.hero-title .accent { color: var(--accent); }

.hero-lede {
  margin-top: 20px;
  max-width: 66ch;
  font-size: 17px;
  color: var(--muted);
}
.hero-lede code {
  font-size: 0.9em;
  padding: 1px 5px;
  border-radius: 6px;
  background: var(--surface-2);
  border: 1px solid var(--hairline);
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
}
.chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--muted);
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: 999px;
  padding: 5px 12px;
}
.chip .dot { width: 7px; height: 7px; border-radius: 50%; flex: none; }
.dot-android { background: var(--android); box-shadow: 0 0 0 3px var(--android-soft); }
.dot-harmony { background: var(--harmony); box-shadow: 0 0 0 3px var(--harmony-soft); }
.dot-node { background: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }

.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 46px;
  padding: 0 20px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 560;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.2s var(--ease), background-color 0.2s var(--ease),
              border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}
.btn:hover { text-decoration: none; transform: translateY(-2px); }
.btn svg { width: 16px; height: 16px; }

.btn-primary { background: var(--accent); color: var(--accent-ink); box-shadow: var(--shadow-sm); }
.btn-primary:hover { background: var(--accent-strong); box-shadow: var(--shadow-md); }
.btn-ghost { background: var(--surface); color: var(--text); border-color: var(--hairline); }
.btn-ghost:hover { border-color: var(--accent-line); }

.stat-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 38px;
  margin-top: 44px;
  padding-top: 26px;
  border-top: 1px solid var(--hairline);
}
.stat-strip li { display: flex; flex-direction: column; gap: 2px; }
.stat-num {
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 600;
  letter-spacing: -0.02em;
}
.stat-label { font-size: 13px; color: var(--muted); }

/* ---------- Section shell ---------- */
.section { padding: clamp(56px, 8vw, 96px) 0; }
.section-head { max-width: 740px; margin-bottom: 42px; }
.section-title {
  font-size: clamp(28px, 4vw, 38px);
  line-height: 1.12;
  letter-spacing: -0.025em;
  font-weight: 720;
  text-wrap: balance;
}
.section-lede { margin-top: 12px; font-size: 16px; color: var(--muted); }

.tint-bg { background: var(--bg-soft); border-block: 1px solid var(--hairline); }

/* ---------- Repo cards ---------- */
.repo-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.repo-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 13px;
  padding: 26px;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease),
              box-shadow 0.3s var(--ease);
}
.repo-card:hover {
  text-decoration: none;
  transform: translateY(-3px);
  border-color: var(--accent-line);
  box-shadow: var(--shadow-lg);
}
.repo-card::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(120% 90% at 50% -30%, var(--glow), transparent 62%);
  opacity: 0;
  transition: opacity 0.35s var(--ease);
  pointer-events: none;
}
.repo-card:hover::after { opacity: 1; }

.card-top { display: flex; align-items: center; justify-content: space-between; gap: 10px; }

.plat-badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.02em;
  padding: 4px 10px;
  border-radius: 999px;
}
.plat-badge .dot { width: 7px; height: 7px; border-radius: 50%; flex: none; }
.plat-android { color: var(--android); background: var(--android-soft); }
.plat-android .dot { background: var(--android); }
.plat-harmony { color: var(--harmony); background: var(--harmony-soft); }
.plat-harmony .dot { background: var(--harmony); }

.role-pill {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--faint);
  border: 1px solid var(--hairline);
  border-radius: 999px;
  padding: 3px 10px;
}

.repo-title {
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.repo-desc { font-size: 14.5px; color: var(--muted); }

.coord-chip {
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text);
  background: var(--surface-2);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-xs);
  padding: 5px 10px;
  overflow-x: auto;
  max-width: 100%;
  white-space: nowrap;
}

.card-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 2px; }
.card-tags li {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--muted);
  background: var(--surface-2);
  border: 1px solid var(--hairline);
  border-radius: 999px;
  padding: 3px 9px;
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: auto;
  padding-top: 8px;
  font-size: 14px;
  font-weight: 560;
  color: var(--accent);
}
.card-link svg { width: 14px; height: 14px; transition: transform 0.25s var(--ease); }
.repo-card:hover .card-link svg { transform: translate(2px, -2px); }

/* ---------- Architecture ---------- */
.arch-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 40px;
  align-items: center;
}
.arch-copy p { margin-top: 14px; color: var(--muted); max-width: 56ch; }
.arch-copy p code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  padding: 1px 5px;
  border-radius: 6px;
  background: var(--surface-2);
  border: 1px solid var(--hairline);
}

.legend { display: grid; gap: 10px; margin-top: 22px; }
.legend li { display: flex; gap: 12px; font-size: 14px; color: var(--muted); }
.legend code {
  flex: none;
  font-size: 12px;
  color: var(--text);
  background: var(--surface-2);
  border: 1px solid var(--hairline);
  border-radius: 7px;
  padding: 2px 8px;
  min-width: 178px;
  text-align: center;
  align-self: start;
}

/* code / diagram window */
.codewin {
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  box-shadow: var(--code-shadow);
  overflow: hidden;
}
.codewin-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--hairline);
  background: var(--surface-2);
}
.codewin-dots { display: inline-flex; gap: 6px; }
.codewin-dots i { width: 10px; height: 10px; border-radius: 50%; background: var(--hairline-strong); }
.codewin-name {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
}
.codewin-body {
  margin: 0;
  padding: 18px 20px;
  font-size: 13px;
  line-height: 1.55;
  color: var(--text);
  overflow-x: auto;
}
.codewin-body .c { color: var(--faint); }
.codewin-body .k { color: var(--accent); }
.codewin-body .s { color: var(--android); }
html[data-theme="dark"] .codewin-body .s { color: var(--android); }

.principles {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  margin-top: 56px;
}
.principle {
  padding: 22px 20px;
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
}
.principle-num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 7px;
  padding: 3px 8px;
}
.principle h3 { font-size: 15.5px; font-weight: 650; margin: 14px 0 8px; letter-spacing: -0.01em; }
.principle p { font-size: 13.5px; color: var(--muted); }
.principle code {
  font-size: 0.88em;
  padding: 1px 4px;
  border-radius: 5px;
  background: var(--surface-2);
  border: 1px solid var(--hairline);
}

/* ---------- Install ---------- */
.install-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
  align-items: start;
}

.install-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 26px;
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}
.install-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; flex-wrap: wrap; }
.install-head h3 { font-size: 19px; font-weight: 650; letter-spacing: -0.015em; }
.install-card .codewin { box-shadow: none; }
.install-card .codewin + .codewin { margin-top: 2px; }

.callout {
  display: flex;
  gap: 11px;
  padding: 13px 15px;
  border-radius: var(--radius-sm);
  background: var(--harmony-soft);
  border: 1px solid color-mix(in srgb, var(--harmony) 30%, transparent);
  font-size: 13px;
  color: var(--muted);
}
.callout strong { color: var(--text); }
.callout code {
  font-size: 0.85em;
  padding: 1px 5px;
  border-radius: 5px;
  background: var(--surface);
  border: 1px solid var(--hairline);
}
.callout-icon { flex: none; color: var(--harmony); margin-top: 2px; }
.callout-icon svg { width: 16px; height: 16px; }

.constraints {
  margin-top: 26px;
  padding: 22px 26px;
  background: var(--surface);
  border: 1px dashed var(--hairline-strong);
  border-radius: var(--radius);
}
.constraints h3 {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 12px;
}
.constraints h3::before { content: "⚠ "; }
.constraints ul { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 9px 28px; }
.constraints li {
  position: relative;
  padding-left: 18px;
  font-size: 13.5px;
  color: var(--muted);
}
.constraints li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 0.55em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--faint);
}
.constraints code {
  font-size: 0.88em;
  padding: 1px 4px;
  border-radius: 5px;
  background: var(--surface-2);
  border: 1px solid var(--hairline);
  color: var(--text);
}

/* ---------- CTA band ---------- */
.cta-band {
  text-align: center;
}
.cta-band .section-head { margin-inline: auto; margin-bottom: 28px; }
.cta-band .hero-actions { justify-content: center; margin-top: 24px; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--hairline);
  background: var(--bg-soft);
  padding: 40px 0 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 32px;
}
.footer-brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 650; }
.footer-brand .brand-logo { width: 26px; height: 26px; }
.footer-one { margin-top: 12px; font-size: 14px; color: var(--muted); max-width: 38ch; }
.footer-copy {
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--faint);
}
.footer-cols {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}
.footer-col h4 {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--faint);
  margin-bottom: 12px;
}
.footer-col a {
  display: block;
  font-size: 14px;
  color: var(--muted);
  padding: 3px 0;
  transition: color 0.2s var(--ease);
}
.footer-col a:hover { color: var(--accent); text-decoration: none; }

/* ---------- Reveal on scroll (JS-gated) ---------- */
html.js .reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}
html.js .reveal.is-visible { opacity: 1; transform: none; }

.hero-inner .reveal:nth-child(1) { transition-delay: 0ms; }
.hero-inner .reveal:nth-child(2) { transition-delay: 70ms; }
.hero-inner .reveal:nth-child(3) { transition-delay: 140ms; }
.hero-inner .reveal:nth-child(4) { transition-delay: 210ms; }
.hero-inner .reveal:nth-child(5) { transition-delay: 280ms; }
.hero-inner .reveal:nth-child(6) { transition-delay: 350ms; }

/* ---------- Responsive ---------- */
@media (max-width: 1020px) {
  .principles { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .arch-grid { grid-template-columns: 1fr; gap: 32px; }
}

@media (max-width: 860px) {
  .repo-grid, .install-grid { grid-template-columns: 1fr; }
  .constraints ul { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  :root { --header-h: 104px; }
  .site-header { height: auto; }
  .header-inner {
    flex-wrap: wrap;
    row-gap: 4px;
    height: auto;
    padding: 9px 18px 7px;
  }
  .brand { order: 1; }
  .controls { order: 2; margin-left: auto; }
  .nav {
    order: 3;
    width: 100%;
    margin: 4px 0 0;
    gap: 4px;
    overflow-x: auto;
    scrollbar-width: none;
  }
  .nav::-webkit-scrollbar { display: none; }
  .nav a { display: inline-flex; align-items: center; min-height: 38px; padding: 0 14px; white-space: nowrap; }
  .container { padding-inline: 18px; }
  .theme-toggle { width: 42px; height: 42px; }
  .lang { display: inline-flex; align-items: center; min-height: 36px; padding: 0 11px; }
  .brand-by { display: none; }
  .footer-grid { grid-template-columns: 1fr; gap: 26px; }
}

@media (max-width: 620px) {
  .principles { grid-template-columns: 1fr; }
  .hero-title { font-size: clamp(34px, 9vw, 46px); }
  .hero-lede { font-size: 16px; }
  .section { padding: 52px 0; }
  .section-head { margin-bottom: 30px; }
  .repo-card, .install-card { padding: 22px 20px; }
  .legend li { flex-direction: column; gap: 5px; }
  .legend code { min-width: 0; text-align: left; align-self: flex-start; }
  .stat-strip { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
}

@media (max-width: 440px) {
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; justify-content: center; }
  .footer-cols { grid-template-columns: 1fr; }
}

@media (max-width: 380px) {
  .container, .header-inner { padding-inline: 14px; }
  .lang { padding: 6px 9px; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
    transition-delay: 0ms !important;
  }
  html.js .reveal { opacity: 1; transform: none; }
  .repo-card:hover, .btn:hover, .theme-toggle:hover { transform: none; }
}