/* RapidHub public landing page — self-contained, same tokens as the developer docs. */
:root {
  --bg: #0f1115;
  --bg-elev: #151821;
  --bg-elev-2: #1b1f2a;
  --bg-code: #0b0d12;
  --border: #252a37;
  --border-strong: #343a4a;
  --text: #e6e8ee;
  --text-strong: #ffffff;
  --muted: #9aa3b2;
  --faint: #6b7385;
  --accent: #ff7a59;
  --accent-strong: #ff8f73;
  --accent-ink: #15171c;
  --accent-soft: rgba(255, 122, 89, 0.12);
  --accent-glow: rgba(255, 122, 89, 0.22);
  --ok: #3ecf8e;
  --note: #5aa9ff;
  --tok-key: #9cdcfe;
  --tok-str: #a5d6a7;
  --tok-kw: #ff9a80;
  --tok-com: #6b7385;
  --tok-fn: #82aaff;
  --grid-line: rgba(255, 255, 255, 0.035);
  --header-bg: rgba(15, 17, 21, 0.72);
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.45);
  --shadow-sm: 0 6px 18px rgba(0, 0, 0, 0.28);
  --radius: 14px;
  --radius-sm: 10px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --wrap: 1240px;
  --header-h: 68px;
  color-scheme: dark;
}

:root[data-theme="light"] {
  --bg: #ffffff;
  --bg-elev: #f7f8fa;
  --bg-elev-2: #eef0f4;
  --bg-code: #0f1115;
  --border: #e3e6ec;
  --border-strong: #cfd4dd;
  --text: #1f2430;
  --text-strong: #0b0e14;
  --muted: #5b6475;
  --faint: #8a93a3;
  --accent: #e8572f;
  --accent-strong: #d0461f;
  --accent-ink: #ffffff;
  --accent-soft: rgba(232, 87, 47, 0.08);
  --accent-glow: rgba(232, 87, 47, 0.14);
  --ok: #138a55;
  --note: #1f6fd1;
  --grid-line: rgba(15, 17, 21, 0.045);
  --header-bg: rgba(255, 255, 255, 0.78);
  --shadow: 0 18px 50px rgba(20, 24, 33, 0.12);
  --shadow-sm: 0 6px 18px rgba(20, 24, 33, 0.08);
  color-scheme: light;
}

/* Hidden until translations are applied (set by the inline head script, removed by landing.js). */
html.i18n-wait body { opacity: 0; }
body { transition: opacity .18s ease; }

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 16px); -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: 16px; top: -60px; z-index: 100; background: var(--accent); color: var(--accent-ink); padding: 10px 14px; border-radius: 8px; font-weight: 600; }
.skip:focus { top: 12px; }

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }

/* ------------------------------------------------------------------ buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 46px; padding: 0 20px; border-radius: 12px; border: 1px solid transparent;
  font-size: 15px; font-weight: 600; letter-spacing: .1px; white-space: nowrap; cursor: pointer;
  transition: background .15s ease, border-color .15s ease, color .15s ease, transform .15s ease, box-shadow .15s ease;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--accent); color: var(--accent-ink); box-shadow: 0 8px 24px var(--accent-glow); }
.btn-primary:hover { background: var(--accent-strong); }
.btn-ghost { background: transparent; border-color: var(--border-strong); color: var(--text-strong); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn-sm { height: 38px; padding: 0 14px; font-size: 14px; border-radius: 10px; box-shadow: none; }
.btn .arrow { transition: transform .15s ease; }
.btn:hover .arrow { transform: translateX(3px); }

/* ------------------------------------------------------------------ header */
.site-header {
  position: sticky; top: 0; z-index: 50; height: var(--header-h);
  background: var(--header-bg);
  -webkit-backdrop-filter: saturate(160%) blur(14px); backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .2s ease, background .2s ease;
}
.site-header.scrolled { border-bottom-color: var(--border); }
.site-header .wrap { height: 100%; display: flex; align-items: center; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; font-size: 19px; color: var(--text-strong); letter-spacing: .2px; }
.brand-mark {
  width: 32px; height: 32px; border-radius: 9px; display: grid; place-items: center;
  background: var(--accent); color: #fff; font-size: 17px; font-weight: 800;
  box-shadow: 0 4px 14px var(--accent-glow);
}
.brand small { font-size: 12px; font-weight: 600; color: var(--muted); border: 1px solid var(--border-strong); border-radius: 6px; padding: 1px 6px; letter-spacing: .4px; }
.main-nav { display: flex; align-items: center; gap: 4px; }
.main-nav a { white-space: nowrap; padding: 8px 12px; border-radius: 8px; font-size: 14.5px; color: var(--muted); font-weight: 500; transition: color .15s ease, background .15s ease; }
.main-nav a:hover { color: var(--text-strong); background: var(--bg-elev-2); }
.header-spacer { flex: 1; }
.header-actions { display: flex; align-items: center; gap: 8px; }
.header-link { white-space: nowrap; display: inline-flex; align-items: center; gap: 7px; padding: 8px 12px; border-radius: 8px; font-size: 14.5px; font-weight: 600; color: var(--text); transition: color .15s ease, background .15s ease; }
.header-link:hover { color: var(--accent); background: var(--accent-soft); }
.icon-btn {
  width: 38px; height: 38px; display: inline-grid; place-items: center; border-radius: 10px;
  border: 1px solid var(--border); background: transparent; color: var(--muted); cursor: pointer;
  transition: color .15s ease, border-color .15s ease;
}
.icon-btn:hover { color: var(--text-strong); border-color: var(--border-strong); }
.theme-dark-icon { display: none; }
:root[data-theme="light"] .theme-dark-icon { display: block; }
:root[data-theme="light"] .theme-light-icon { display: none; }

/* language picker */
.lang { position: relative; }
.lang-btn {
  height: 38px; display: inline-flex; align-items: center; gap: 7px; padding: 0 11px; border-radius: 10px;
  border: 1px solid var(--border); background: transparent; color: var(--text); cursor: pointer; font-size: 13.5px; font-weight: 600;
  transition: border-color .15s ease;
}
.lang-btn:hover, .lang-btn[aria-expanded="true"] { border-color: var(--border-strong); }
.lang-btn .chev { transition: transform .15s ease; color: var(--faint); }
.lang-btn[aria-expanded="true"] .chev { transform: rotate(180deg); }
.lang-menu {
  position: absolute; right: 0; top: calc(100% + 8px); min-width: 180px; padding: 6px; margin: 0; list-style: none;
  background: var(--bg-elev); border: 1px solid var(--border); border-radius: 12px; box-shadow: var(--shadow);
  opacity: 0; visibility: hidden; transform: translateY(-4px); transition: opacity .15s ease, transform .15s ease, visibility .15s;
}
.lang-menu.open { opacity: 1; visibility: visible; transform: none; }
.lang-menu button {
  width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 9px 11px; border: 0; border-radius: 8px; background: transparent; cursor: pointer; font-size: 14px; text-align: left;
}
.lang-menu button:hover, .lang-menu button:focus-visible { background: var(--bg-elev-2); outline: none; }
.lang-menu button .code { font-size: 11.5px; color: var(--faint); font-weight: 700; letter-spacing: .6px; }
.lang-menu button[aria-checked="true"] { color: var(--accent); font-weight: 600; }
.lang-menu button[aria-checked="true"] .code { color: var(--accent); }

.menu-btn { display: none; }

/* mobile drawer */
.drawer {
  position: fixed; inset: var(--header-h) 0 0 0; z-index: 49; background: var(--bg);
  padding: 20px 24px 32px; display: flex; flex-direction: column; gap: 6px; overflow-y: auto;
  opacity: 0; visibility: hidden; transform: translateY(-8px); transition: opacity .18s ease, transform .18s ease, visibility .18s;
}
.drawer.open { opacity: 1; visibility: visible; transform: none; }
.drawer a.d-link { padding: 14px 4px; font-size: 18px; font-weight: 600; color: var(--text-strong); border-bottom: 1px solid var(--border); }
.drawer .d-actions { display: grid; gap: 10px; margin-top: 22px; }
.drawer .d-actions .btn { width: 100%; height: 50px; }

/* ------------------------------------------------------------------ hero */
.hero { position: relative; padding: 76px 0 56px; overflow: hidden; }
.hero::before {
  content: ""; position: absolute; inset: 0; z-index: -2;
  background-image: linear-gradient(var(--grid-line) 1px, transparent 1px), linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 48px 48px;
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 30%, #000 30%, transparent 75%);
          mask-image: radial-gradient(ellipse 80% 70% at 50% 30%, #000 30%, transparent 75%);
}
.hero::after {
  content: ""; position: absolute; z-index: -1; width: 720px; height: 720px; right: -160px; top: -260px;
  background: radial-gradient(circle, var(--accent-glow), transparent 62%); filter: blur(10px); pointer-events: none;
}
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.02fr) minmax(0, 1fr); gap: 56px; align-items: center; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px; padding: 5px 12px 5px 8px; border-radius: 999px;
  background: var(--accent-soft); color: var(--accent); font-size: 13px; font-weight: 600; letter-spacing: .2px;
}
.eyebrow .pulse { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 0 var(--accent-glow); animation: pulse 2.2s infinite; }
@keyframes pulse { 0% { box-shadow: 0 0 0 0 var(--accent-glow); } 70% { box-shadow: 0 0 0 9px transparent; } 100% { box-shadow: 0 0 0 0 transparent; } }
.hero h1 {
  margin: 20px 0 18px; font-size: clamp(36px, 4.6vw, 56px); line-height: 1.06; letter-spacing: -1.6px;
  color: var(--text-strong); font-weight: 800;
}
.hero h1 .hl { position: relative; color: var(--accent); }
.hero h1 .hl { background: linear-gradient(transparent 78%, var(--accent-soft) 78%, var(--accent-soft) 94%, transparent 94%); -webkit-box-decoration-break: clone; box-decoration-break: clone; }
.lead { font-size: 18.5px; line-height: 1.6; color: var(--muted); margin: 0 0 30px; max-width: 560px; }
.hero-ctas { display: flex; flex-wrap: wrap; gap: 12px; }
.hero-facts { display: flex; flex-wrap: wrap; gap: 0; margin-top: 38px; padding-top: 22px; border-top: 1px solid var(--border); max-width: 560px; }
.hero-facts > div { flex: 1 1 160px; padding-right: 20px; }
.hero-facts > div + div { padding-left: 20px; border-left: 1px solid var(--border); }
.fact-label { font-size: 11.5px; font-weight: 700; letter-spacing: 1px; text-transform: uppercase; color: var(--faint); }
.fact-value { font-size: 15px; font-weight: 600; color: var(--text-strong); margin-top: 3px; }

/* hero diagram */
.diagram {
  position: relative; border-radius: 22px; padding: 18px; background: var(--bg-elev);
  border: 1px solid var(--border); box-shadow: var(--shadow);
}
.diagram::before {
  content: ""; position: absolute; inset: 0; border-radius: inherit; pointer-events: none;
  background: radial-gradient(circle at 50% 50%, var(--accent-soft), transparent 55%);
}
.diagram svg { width: 100%; height: auto; overflow: visible; }
.diagram .d-caption { display: flex; justify-content: space-between; padding: 6px 6px 0; font: 600 10.5px/1 var(--mono); letter-spacing: 1.2px; text-transform: uppercase; color: var(--faint); }
.dg-line { fill: none; stroke: var(--border-strong); stroke-width: 1.5; }
.dg-line.live { stroke: var(--accent); stroke-opacity: .5; stroke-dasharray: 4 6; animation: dash 1.4s linear infinite; }
@keyframes dash { to { stroke-dashoffset: -20; } }
.dg-ring { fill: none; stroke: var(--border); stroke-dasharray: 2 5; }
.dg-node rect.card { fill: var(--bg-elev-2); stroke: var(--border-strong); }
.dg-node text { fill: var(--text-strong); font: 600 13px var(--font); }
.dg-node text.sub { fill: var(--faint); font: 500 10.5px var(--font); }
.dg-hub rect { fill: var(--accent); }
.dg-hub text { fill: #fff; font: 800 30px var(--font); }
.dg-hub text.sub { fill: var(--text-strong); font: 700 12px var(--font); }
.dg-dot { fill: var(--accent); }
.dg-dot.back { fill: var(--ok); }

/* ------------------------------------------------------------------ platform strip */
.strip { border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); background: var(--bg-elev); }
.strip .wrap { display: flex; align-items: center; gap: 28px; min-height: 84px; flex-wrap: wrap; padding-top: 16px; padding-bottom: 16px; }
.strip-label { font-size: 13px; font-weight: 600; color: var(--faint); flex: 0 0 auto; max-width: 180px; line-height: 1.35; }
.chips { display: flex; flex-wrap: wrap; gap: 10px 12px; flex: 1; }
.chip {
  display: inline-flex; align-items: center; gap: 9px; padding: 7px 14px 7px 8px; border-radius: 999px;
  border: 1px solid var(--border); background: var(--bg); font-size: 14px; font-weight: 600; color: var(--text-strong);
}
.chip i { width: 22px; height: 22px; border-radius: 7px; display: grid; place-items: center; font: 800 11px var(--font); font-style: normal; color: #fff; }
.chip.soon { color: var(--muted); }
.chip.soon::after { content: attr(data-soon); font-size: 10.5px; font-weight: 700; letter-spacing: .5px; text-transform: uppercase; color: var(--faint); border: 1px solid var(--border-strong); border-radius: 5px; padding: 0 5px; margin-left: 2px; }

/* ------------------------------------------------------------------ sections */
.section { padding: 104px 0; }
.section.alt { background: var(--bg-elev); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section-head { max-width: 720px; margin-bottom: 56px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.kicker { font-size: 13px; font-weight: 700; letter-spacing: 1.2px; text-transform: uppercase; color: var(--accent); }
.section h2 { margin: 12px 0 14px; font-size: clamp(28px, 3.6vw, 42px); line-height: 1.12; letter-spacing: -1px; color: var(--text-strong); font-weight: 800; }
.section-head p { margin: 0; font-size: 17.5px; color: var(--muted); }

/* problem / flows */
.problem-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr); gap: 56px; align-items: start; }
.flows { display: grid; gap: 4px; counter-reset: flow; }
.flow { display: grid; grid-template-columns: 52px 1fr; gap: 16px; padding: 20px 18px; border-radius: var(--radius); transition: background .15s ease; }
.flow:hover { background: var(--bg-elev-2); }
.flow .num { font: 700 13px var(--mono); color: var(--accent); width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center; background: var(--accent-soft); }
.flow h3 { margin: 0 0 4px; font-size: 18px; color: var(--text-strong); }
.flow p { margin: 0; color: var(--muted); font-size: 15.5px; }

.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.compare-card { border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg); padding: 18px 18px 14px; }
.compare-card.good { border-color: color-mix(in srgb, var(--accent) 45%, var(--border)); box-shadow: 0 0 0 4px var(--accent-soft); }
.compare-card h4 { margin: 0 0 2px; font-size: 14px; color: var(--text-strong); }
.compare-card .tag { font-size: 12px; color: var(--faint); }
.compare-card svg { margin-top: 12px; }
.cmp-line { stroke: var(--border-strong); stroke-width: 1.3; fill: none; }
.cmp-line.bad { stroke: #e5484d; stroke-opacity: .55; }
.cmp-line.good { stroke: var(--accent); stroke-opacity: .75; }
.cmp-box { fill: var(--bg-elev-2); stroke: var(--border-strong); }
.cmp-hub { fill: var(--accent); }
.cmp-text { fill: var(--text); font: 600 10px var(--font); }
.cmp-text.light { fill: #fff; font-weight: 800; }
.compare-note { grid-column: 1 / -1; font-size: 13px; color: var(--faint); margin: 2px 2px 0; }

/* how it works */
.how-grid { display: grid; grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr); gap: 56px; align-items: start; }
.steps { list-style: none; margin: 0; padding: 0; position: relative; }
.steps::before { content: ""; position: absolute; left: 19px; top: 24px; bottom: 24px; width: 2px; background: linear-gradient(var(--accent), var(--border)); opacity: .55; }
.steps li { position: relative; display: grid; grid-template-columns: 40px 1fr; gap: 18px; padding: 0 0 30px; }
.steps li:last-child { padding-bottom: 0; }
.steps .dot { width: 40px; height: 40px; border-radius: 50%; display: grid; place-items: center; background: var(--bg); border: 2px solid var(--accent); color: var(--accent); font-weight: 800; font-size: 15px; z-index: 1; }
.section.alt .steps .dot { background: var(--bg-elev); }
.steps h3 { margin: 6px 0 4px; font-size: 17.5px; color: var(--text-strong); }
.steps p { margin: 0; color: var(--muted); font-size: 15.5px; }
.steps code { font-family: var(--mono); font-size: 13px; background: var(--bg-elev-2); border: 1px solid var(--border); border-radius: 6px; padding: 1px 6px; color: var(--text-strong); }

.code-card { border-radius: 16px; overflow: hidden; background: var(--bg-code); border: 1px solid #252a37; box-shadow: var(--shadow); position: sticky; top: calc(var(--header-h) + 24px); }
.code-top { display: flex; align-items: center; gap: 4px; padding: 10px 12px; border-bottom: 1px solid #252a37; background: #12151c; }
.code-top .lights { display: flex; gap: 6px; margin-right: 10px; }
.code-top .lights i { width: 10px; height: 10px; border-radius: 50%; background: #343a4a; }
.tab { border: 0; background: transparent; color: #9aa3b2; font-size: 13px; font-weight: 600; padding: 6px 11px; border-radius: 7px; cursor: pointer; }
.tab:hover { color: #fff; }
.tab[aria-selected="true"] { background: #1b1f2a; color: #fff; }
.copy-btn { margin-left: auto; border: 1px solid #343a4a; background: transparent; color: #9aa3b2; font-size: 12px; font-weight: 600; padding: 5px 10px; border-radius: 7px; cursor: pointer; }
.copy-btn:hover { color: #fff; border-color: #6b7385; }
.copy-btn.done { color: #3ecf8e; border-color: #3ecf8e; }
.code-card pre { margin: 0; padding: 20px 22px 22px; overflow-x: auto; font: 13.5px/1.7 var(--mono); color: #e6e8ee; tab-size: 2; }
.code-card pre[hidden] { display: none; }
.t-k { color: #ff9a80; } .t-s { color: #a5d6a7; } .t-c { color: #6b7385; font-style: italic; } .t-f { color: #82aaff; } .t-p { color: #9cdcfe; }
.code-foot { display: flex; align-items: center; gap: 10px; padding: 12px 18px; border-top: 1px solid #252a37; font-size: 13px; color: #9aa3b2; background: #12151c; }
.code-foot .live-dot { width: 8px; height: 8px; border-radius: 50%; background: #3ecf8e; box-shadow: 0 0 0 3px rgba(62, 207, 142, .18); }
.code-foot a { margin-left: auto; color: #ff9a80; font-weight: 600; white-space: nowrap; }
.code-foot a:hover { text-decoration: underline; }

/* features */
.features { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.feature {
  position: relative; padding: 26px 24px 24px; border-radius: var(--radius); background: var(--bg);
  border: 1px solid var(--border); transition: border-color .2s ease, transform .2s ease, box-shadow .2s ease;
}
.section.alt .feature { background: var(--bg); }
.feature:hover { border-color: var(--border-strong); transform: translateY(-3px); box-shadow: var(--shadow-sm); }
.feature .ic { width: 42px; height: 42px; border-radius: 12px; display: grid; place-items: center; background: var(--accent-soft); color: var(--accent); margin-bottom: 18px; }
.feature h3 { margin: 0 0 6px; font-size: 17px; color: var(--text-strong); }
.feature p { margin: 0; font-size: 15px; color: var(--muted); }

/* audiences */
.paths { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.path {
  display: flex; flex-direction: column; padding: 28px 26px; border-radius: 18px; border: 1px solid var(--border);
  background: var(--bg-elev); transition: border-color .2s ease, transform .2s ease;
}
.path:hover { border-color: var(--accent); transform: translateY(-3px); }
.path .for { font-size: 12px; font-weight: 700; letter-spacing: 1px; text-transform: uppercase; color: var(--accent); }
.path h3 { margin: 10px 0 8px; font-size: 20px; line-height: 1.3; color: var(--text-strong); }
.path p { margin: 0 0 22px; color: var(--muted); font-size: 15px; flex: 1; }
.path .route { font: 600 12.5px var(--mono); color: var(--faint); padding-top: 16px; border-top: 1px dashed var(--border-strong); display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.path .route .go { color: var(--accent); font-family: var(--font); font-size: 14px; font-weight: 700; white-space: nowrap; }

/* operating models */
.models { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0; border: 1px solid var(--border); border-radius: 18px; overflow: hidden; background: var(--bg); }
.model { padding: 28px 26px; }
.model + .model { border-left: 1px solid var(--border); }
.model .m-tag { display: inline-block; font: 700 12px var(--mono); padding: 3px 9px; border-radius: 6px; background: var(--bg-elev-2); color: var(--text-strong); border: 1px solid var(--border); }
.model.rec .m-tag { background: var(--accent); color: var(--accent-ink); border-color: transparent; }
.model h3 { margin: 14px 0 6px; font-size: 18px; color: var(--text-strong); }
.model p { margin: 0; color: var(--muted); font-size: 15px; }

/* trust */
.trust { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 0; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.trust > div { padding: 30px 22px; }
.trust > div + div { border-left: 1px solid var(--border); }
.trust .big { white-space: nowrap; font-size: 26px; font-weight: 800; letter-spacing: -.5px; color: var(--text-strong); }
.trust .small { font-size: 14px; color: var(--muted); margin-top: 4px; }

/* developer resources */
.res-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.res {
  display: flex; flex-direction: column; gap: 8px; padding: 22px; border-radius: var(--radius); border: 1px solid var(--border);
  background: var(--bg); transition: border-color .2s ease, transform .2s ease;
}
.res:hover { border-color: var(--accent); transform: translateY(-3px); }
.res .ic { color: var(--accent); }
.res h3 { margin: 6px 0 0; font-size: 16.5px; color: var(--text-strong); display: flex; align-items: center; justify-content: space-between; }
.res h3 .arrow { color: var(--faint); transition: transform .15s ease, color .15s ease; }
.res:hover h3 .arrow { transform: translateX(3px); color: var(--accent); }
.res p { margin: 0; font-size: 14.5px; color: var(--muted); }

/* final CTA */
.cta-band { padding: 0 0 104px; }
.cta-box {
  position: relative; overflow: hidden; border-radius: 24px; padding: 64px 56px; text-align: center;
  background: linear-gradient(135deg, #1b1f2a, #12151c); border: 1px solid #252a37; color: #e6e8ee;
}
.cta-box::before { content: ""; position: absolute; width: 560px; height: 560px; left: 50%; top: -340px; transform: translateX(-50%); background: radial-gradient(circle, rgba(255, 122, 89, .35), transparent 65%); }
.cta-box > * { position: relative; }
.cta-box h2 { margin: 0 0 12px; font-size: clamp(28px, 3.4vw, 40px); line-height: 1.15; letter-spacing: -1px; color: #fff; }
.cta-box p { margin: 0 auto 28px; max-width: 560px; color: #9aa3b2; font-size: 17px; }
.cta-box .hero-ctas { justify-content: center; }
.cta-box .btn-ghost { color: #fff; border-color: #343a4a; }
.cta-box .btn-ghost:hover { border-color: #ff7a59; color: #ff7a59; }
.cta-box .btn-primary { background: #ff7a59; color: #15171c; }
.cta-box .btn-primary:hover { background: #ff8f73; }

/* footer */
.site-footer { border-top: 1px solid var(--border); padding: 56px 0 36px; background: var(--bg-elev); }
.foot-grid { display: grid; grid-template-columns: 1.4fr repeat(3, 1fr); gap: 32px; }
.foot-grid h4 { margin: 0 0 12px; font-size: 13px; font-weight: 700; letter-spacing: .8px; text-transform: uppercase; color: var(--faint); }
.foot-grid ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.foot-grid ul a { color: var(--muted); font-size: 14.5px; }
.foot-grid ul a:hover { color: var(--accent); }
.foot-about p { color: var(--muted); font-size: 14.5px; margin: 14px 0 0; max-width: 320px; }
.foot-bottom { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; margin-top: 44px; padding-top: 22px; border-top: 1px solid var(--border); font-size: 13.5px; color: var(--faint); }

/* ------------------------------------------------------------------ reveal on scroll */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s cubic-bezier(.2, .7, .2, 1); }
.reveal.in { opacity: 1; transform: none; }
.no-js .reveal { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
}

/* ------------------------------------------------------------------ responsive */
@media (max-width: 1180px) {
  .main-nav { display: none; }
  .menu-btn { display: inline-grid; }
}
@media (max-width: 1080px) {
  .features { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .res-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .trust { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .trust > div:nth-child(4) { border-left: 0; }
  .trust > div:nth-child(n+4) { border-top: 1px solid var(--border); }
}
@media (max-width: 920px) {
  .hero { padding: 48px 0 40px; }
  .hero-grid, .problem-grid, .how-grid { grid-template-columns: minmax(0, 1fr); gap: 40px; }
  .code-card { position: static; }
  .paths, .models { grid-template-columns: minmax(0, 1fr); }
  .model + .model { border-left: 0; border-top: 1px solid var(--border); }
  .foot-grid { grid-template-columns: 1fr 1fr; }
  .foot-about { grid-column: 1 / -1; }
  .section { padding: 76px 0; }
  .cta-band { padding-bottom: 76px; }
}
@media (max-width: 760px) {
  .header-actions .hide-sm { display: none; }
  .site-header .wrap { gap: 12px; }
}
@media (max-width: 600px) {
  .wrap { padding: 0 16px; }
  .brand small { display: none; }
  .lang-btn .lang-name { display: none; }
  .hero h1 { letter-spacing: -1px; }
    .lead { font-size: 17px; }
  .hero-ctas .btn { flex: 1 1 100%; }
  .hero-facts > div { flex-basis: 100%; padding: 0; }
  .hero-facts > div + div { border-left: 0; padding: 14px 0 0; margin-top: 14px; border-top: 1px solid var(--border); }
  .diagram { padding: 10px; border-radius: 16px; }
  .strip-label { max-width: none; flex-basis: 100%; }
  .compare { grid-template-columns: minmax(0, 1fr); }
  .features, .res-grid { grid-template-columns: minmax(0, 1fr); }
  .trust { grid-template-columns: 1fr 1fr; }
  .trust > div { padding: 22px 14px; }
  .trust .big { font-size: 21px; }
  .trust > div:nth-child(odd) { border-left: 0; }
  .trust > div:nth-child(4) { border-left: 1px solid var(--border); }
  .trust > div:nth-child(n+3) { border-top: 1px solid var(--border); }
  .trust > div:last-child { grid-column: 1 / -1; border-left: 0; }
  .flow { grid-template-columns: 44px 1fr; padding: 16px 6px; }
  .cta-box { padding: 44px 22px; border-radius: 18px; }
  .foot-grid { grid-template-columns: 1fr 1fr; gap: 28px 20px; }
  .code-card pre { font-size: 12.5px; padding: 16px; }
  .code-top .lights { display: none; }
}

/* ================================================================== inner pages (about, contact, legal) */
.main-nav a[aria-current="page"], .drawer a[aria-current="page"] { color: var(--accent); }
.main-nav a[aria-current="page"] { background: var(--accent-soft); }

.page-hero { position: relative; padding: 84px 0 40px; overflow: hidden; }
.page-hero::before {
  content: ""; position: absolute; inset: 0; z-index: -2;
  background-image: linear-gradient(var(--grid-line) 1px, transparent 1px), linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 48px 48px;
  -webkit-mask-image: radial-gradient(ellipse 70% 90% at 30% 0%, #000 25%, transparent 70%);
          mask-image: radial-gradient(ellipse 70% 90% at 30% 0%, #000 25%, transparent 70%);
}
.page-hero::after { content: ""; position: absolute; z-index: -1; width: 560px; height: 560px; left: -180px; top: -320px; background: radial-gradient(circle, var(--accent-glow), transparent 62%); pointer-events: none; }
.page-hero h1 { margin: 12px 0 16px; max-width: 820px; font-size: clamp(34px, 4.6vw, 52px); line-height: 1.08; letter-spacing: -1.4px; color: var(--text-strong); font-weight: 800; }
.page-hero .lead { max-width: 680px; margin: 0; }
.section.tight { padding-top: 32px; }
.cta-band.top-pad { padding-top: 104px; }

/* about */
.story { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); gap: 56px; align-items: start; }
.story-text h2 { margin-top: 0; }
.story-text p { color: var(--muted); font-size: 17px; margin: 0 0 16px; }
.story-card { position: sticky; top: calc(var(--header-h) + 24px); display: grid; gap: 0; padding: 8px 24px 24px; border-radius: 18px; border: 1px solid var(--border); background: var(--bg-elev); box-shadow: var(--shadow-sm); }
.sc-row { display: grid; gap: 2px; padding: 16px 0; border-bottom: 1px solid var(--border); }
.sc-label { font-size: 12px; font-weight: 700; letter-spacing: .8px; text-transform: uppercase; color: var(--faint); }
.sc-value { font-size: 15.5px; font-weight: 600; color: var(--text-strong); }
.story-card .btn { margin-top: 20px; justify-self: start; }

/* contact */
.contact-grid { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr); gap: 40px; align-items: start; }
.contact-form { padding: 32px; border-radius: 20px; border: 1px solid var(--border); background: var(--bg-elev); box-shadow: var(--shadow-sm); display: grid; gap: 18px; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.field { display: grid; gap: 7px; min-width: 0; }
.field label { font-size: 14px; font-weight: 600; color: var(--text-strong); }
.field .opt { font-weight: 500; color: var(--faint); font-size: 13px; }
.field input, .field select, .field textarea {
  width: 100%; font: inherit; font-size: 15px; color: var(--text-strong); background: var(--bg);
  border: 1px solid var(--border-strong); border-radius: 10px; padding: 11px 13px; transition: border-color .15s ease, box-shadow .15s ease;
}
.field textarea { resize: vertical; min-height: 140px; line-height: 1.55; }
.field input:hover, .field select:hover, .field textarea:hover { border-color: var(--faint); }
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 4px var(--accent-soft); }
.select { position: relative; }
.select select { -webkit-appearance: none; appearance: none; padding-right: 38px; cursor: pointer; }
.select::after { content: ""; position: absolute; right: 15px; top: 50%; width: 8px; height: 8px; margin-top: -6px; border-right: 2px solid var(--faint); border-bottom: 2px solid var(--faint); transform: rotate(45deg); pointer-events: none; }
.field-err { display: none; margin: 0; font-size: 13px; color: #ff6b6b; }
:root[data-theme="light"] .field-err { color: #c62828; }
.field.invalid input, .field.invalid textarea { border-color: #ff6b6b; }
.field.invalid .field-err { display: block; }
.form-foot { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; margin-top: 4px; }
.form-note { margin: 0; font-size: 13px; color: var(--faint); flex: 1 1 220px; }
.form-ok { margin: 0; padding: 12px 14px; border-radius: 10px; background: rgba(62, 207, 142, .1); color: var(--ok); font-size: 14px; font-weight: 600; }
.contact-side { display: grid; gap: 12px; }
.contact-card { display: flex; gap: 14px; align-items: flex-start; padding: 18px 20px; border-radius: var(--radius); border: 1px solid var(--border); background: var(--bg); transition: border-color .2s ease, transform .2s ease; }
a.contact-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.cc-ic { flex: 0 0 auto; width: 40px; height: 40px; border-radius: 11px; display: grid; place-items: center; background: var(--accent-soft); color: var(--accent); }
.cc-t { display: block; font-size: 15px; font-weight: 700; color: var(--text-strong); }
.cc-v { display: block; font-size: 14.5px; color: var(--muted); margin-top: 2px; line-height: 1.5; word-break: break-word; }

/* legal */
.legal-grid { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 56px; align-items: start; }
.legal-toc { position: sticky; top: calc(var(--header-h) + 24px); display: grid; gap: 2px; border-left: 2px solid var(--border); }
.legal-toc a { padding: 6px 0 6px 16px; margin-left: -2px; border-left: 2px solid transparent; font-size: 14px; color: var(--muted); }
.legal-toc a:hover { color: var(--text-strong); border-left-color: var(--accent); }
.prose { max-width: 720px; }
.prose h2 { margin: 40px 0 10px; font-size: 21px; color: var(--text-strong); letter-spacing: -.3px; }
.prose h2:first-child { margin-top: 0; }
.prose p { color: var(--muted); margin: 0 0 12px; }
.prose a { color: var(--accent); font-weight: 600; }
.prose a:hover { text-decoration: underline; }
.kv { display: grid; grid-template-columns: 180px 1fr; margin: 0; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.kv dt, .kv dd { margin: 0; padding: 13px 16px; border-bottom: 1px solid var(--border); }
.kv dt { font-size: 14px; font-weight: 600; color: var(--faint); background: var(--bg-elev); }
.kv dd { color: var(--text-strong); font-weight: 500; }
.kv dt:last-of-type, .kv dd:last-of-type { border-bottom: 0; }

@media (max-width: 920px) {
  .story, .contact-grid, .legal-grid { grid-template-columns: minmax(0, 1fr); gap: 32px; }
  .story-card, .legal-toc { position: static; }
  .legal-toc { display: none; }
  .page-hero { padding: 56px 0 28px; }
  .cta-band.top-pad { padding-top: 76px; }
}
@media (max-width: 600px) {
  .field-row { grid-template-columns: minmax(0, 1fr); }
  .contact-form { padding: 22px 18px; }
  .form-foot .btn { width: 100%; }
  .kv { grid-template-columns: minmax(0, 1fr); }
  .kv dt { border-bottom: 0; padding-bottom: 2px; background: transparent; font-size: 12.5px; text-transform: uppercase; letter-spacing: .6px; }
  .kv dd { padding-top: 0; }
}