/* InterlaceLogic website. Colours follow the product's design tokens (web/src/styles/tokens.css). */
:root {
  --font: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, 'SFMono-Regular', Consolas, monospace;

  --bg: #ffffff;
  --bg-soft: #f4f6f9;
  --surface: #ffffff;
  --surface-2: #f8fafc;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  --text: #0f172a;
  --text-2: #475569;
  --text-3: #94a3b8;

  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-soft: #eff6ff;
  --indigo: #6366f1;
  --success: #16a34a;
  --success-soft: #f0fdf4;
  --warning: #d97706;
  --warning-soft: #fffbeb;
  --violet: #7c3aed;
  --cyan: #0891b2;

  --navy: #0b1324;
  --navy-2: #111c33;
  --navy-border: #1e2a45;
  --navy-text: #cbd5e1;
  --navy-muted: #7485a3;

  --radius: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, .08), 0 1px 2px rgba(15, 23, 42, .04);
  --shadow-md: 0 6px 18px rgba(15, 23, 42, .08), 0 2px 4px rgba(15, 23, 42, .04);
  --shadow-lg: 0 24px 60px rgba(15, 23, 42, .18), 0 6px 16px rgba(15, 23, 42, .08);
  --gutter: clamp(16px, 4vw, 32px);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; -webkit-text-size-adjust: 100%; }
body { margin: 0; font-family: var(--font); color: var(--text); background: var(--bg); line-height: 1.6; font-size: 16px; -webkit-font-smoothing: antialiased; overflow-x: hidden; }
img, svg { max-width: 100%; }
a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-hover); }
h1, h2, h3, h4 { line-height: 1.15; letter-spacing: -0.02em; margin: 0; }
p { margin: 0; }
code { font-family: var(--mono); font-size: .9em; }
:focus-visible { outline: 3px solid rgba(37, 99, 235, .45); outline-offset: 2px; border-radius: 6px; }

.container { width: 100%; max-width: 1180px; margin: 0 auto; padding: 0 var(--gutter); }
.section { padding: clamp(64px, 9vw, 112px) 0; }
.section.soft { background: var(--bg-soft); }
.section.dark { background: var(--navy); color: var(--navy-text); }
.section-head { max-width: 720px; margin-bottom: clamp(36px, 5vw, 56px); }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; color: var(--primary); margin-bottom: 14px; }
.dark .eyebrow { color: #7da6ff; }
.section-head h2 { font-size: clamp(28px, 4vw, 42px); font-weight: 750; }
.dark h2, .dark h3 { color: #fff; }
.section-head p { margin-top: 16px; font-size: clamp(16px, 1.6vw, 18.5px); color: var(--text-2); }
.dark .section-head p { color: var(--navy-text); }

/* ---------- Buttons ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; height: 46px; padding: 0 20px; border-radius: 10px; font-weight: 600; font-size: 15px; border: 1px solid transparent; cursor: pointer; transition: background .15s, box-shadow .15s, transform .15s; white-space: nowrap; }
.btn svg { width: 18px; height: 18px; }
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 6px 16px rgba(37, 99, 235, .3); }
.btn-primary:hover { background: var(--primary-hover); color: #fff; transform: translateY(-1px); }
.btn-ghost { background: var(--surface); color: var(--text); border-color: var(--border-strong); }
.btn-ghost:hover { background: var(--surface-2); color: var(--text); }
.dark .btn-ghost { background: transparent; color: #fff; border-color: var(--navy-border); }
.dark .btn-ghost:hover { background: rgba(255, 255, 255, .06); color: #fff; }

/* ---------- Header ---------- */
.site-header { position: sticky; top: 0; z-index: 50; background: rgba(255, 255, 255, .86); backdrop-filter: saturate(160%) blur(12px); -webkit-backdrop-filter: saturate(160%) blur(12px); border-bottom: 1px solid transparent; transition: border-color .2s; }
.site-header.scrolled { border-bottom-color: var(--border); }
.nav { display: flex; align-items: center; gap: 28px; height: 68px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 750; font-size: 18px; color: var(--text); letter-spacing: -.01em; }
.brand:hover { color: var(--text); }
.brand img { width: 32px; height: 32px; }
.brand-name span { color: var(--primary); }
.nav-links { display: flex; gap: 26px; margin-left: 12px; }
.nav-links a { color: var(--text-2); font-weight: 500; font-size: 15px; }
.nav-links a:hover { color: var(--text); }
.nav-cta { margin-left: auto; display: flex; gap: 10px; align-items: center; }
.nav-cta .btn { height: 40px; padding: 0 16px; font-size: 14.5px; }
.menu-toggle { display: none; margin-left: auto; width: 42px; height: 42px; border-radius: 10px; border: 1px solid var(--border); background: var(--surface); align-items: center; justify-content: center; cursor: pointer; color: var(--text); }
.menu-toggle svg { width: 20px; height: 20px; }

/* ---------- Hero ---------- */
.hero { position: relative; padding: clamp(48px, 7vw, 88px) 0 clamp(110px, 11vw, 140px); overflow: hidden;
  background: radial-gradient(1100px 520px at 85% -10%, rgba(99, 102, 241, .14), transparent 60%), radial-gradient(900px 480px at -10% 10%, rgba(37, 99, 235, .10), transparent 60%), var(--bg); }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr); gap: clamp(32px, 5vw, 64px); align-items: center; }
.pill { display: inline-flex; align-items: center; gap: 8px; padding: 6px 12px 6px 6px; border-radius: 999px; background: var(--surface); border: 1px solid var(--border); font-size: 13.5px; color: var(--text-2); box-shadow: var(--shadow-sm); margin-bottom: 22px; }
.pill b { background: var(--primary-soft); color: var(--primary); font-weight: 600; padding: 2px 9px; border-radius: 999px; font-size: 12.5px; }
.hero h1 { font-size: clamp(34px, 4.2vw, 52px); font-weight: 800; letter-spacing: -0.035em; }
.hero h1 .accent { background: linear-gradient(120deg, var(--primary), var(--indigo) 60%, var(--violet)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-lead { margin-top: 22px; font-size: clamp(17px, 1.8vw, 20px); color: var(--text-2); max-width: 560px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.hero-points { display: flex; flex-wrap: wrap; gap: 10px 22px; margin-top: 28px; padding: 0; list-style: none; color: var(--text-2); font-size: 14.5px; }
.hero-points li { display: inline-flex; align-items: center; gap: 8px; }
.hero-points svg { width: 17px; height: 17px; color: var(--success); flex: none; }

/* Product mock (built in HTML so it stays sharp) */
.mock { position: relative; border-radius: var(--radius-lg); background: var(--surface); border: 1px solid var(--border); box-shadow: var(--shadow-lg); overflow: hidden; font-size: 12.5px; }
.mock-bar { display: flex; align-items: center; gap: 7px; height: 38px; padding: 0 14px; background: var(--surface-2); border-bottom: 1px solid var(--border); }
.mock-bar i { width: 10px; height: 10px; border-radius: 50%; background: #e2e8f0; }
.mock-bar i:nth-child(1) { background: #fca5a5; } .mock-bar i:nth-child(2) { background: #fcd34d; } .mock-bar i:nth-child(3) { background: #86efac; }
.mock-bar span { margin-left: 10px; color: var(--text-3); font-size: 12px; }
.mock-body { display: grid; grid-template-columns: 36% 64%; min-height: 410px; }
.mock-chat { padding: 14px; border-right: 1px solid var(--border); display: flex; flex-direction: column; gap: 10px; background: var(--surface); }
.bubble { padding: 9px 11px; border-radius: 11px; line-height: 1.45; }
.bubble.user { align-self: flex-end; background: var(--primary); color: #fff; border-bottom-right-radius: 3px; max-width: 92%; }
.bubble.ai { background: var(--surface-2); border: 1px solid var(--border); border-top-left-radius: 3px; }
.bubble.ai strong { display: block; font-size: 11.5px; color: var(--success); margin-bottom: 4px; }
.bubble.ai ol { margin: 4px 0 0; padding-left: 18px; }
.bubble.ai .rule { margin-top: 8px; padding: 6px 8px; border-radius: 7px; background: var(--primary-soft); color: var(--primary-hover); font-size: 11.5px; }
.mock-draft { position: relative; background: #f8fafc; background-image: radial-gradient(#cbd5e1 1.1px, transparent 1.1px); background-size: 16px 16px; display: flex; flex-direction: column; }
.mock-tabs { display: flex; gap: 2px; padding: 0 10px; background: var(--surface); border-bottom: 1px solid var(--border); }
.mock-tabs span { padding: 9px 10px; color: var(--text-2); font-weight: 500; font-size: 11.5px; }
.mock-tabs span.on { color: var(--primary); box-shadow: inset 0 -2px 0 var(--primary); }
.mock-tabs em { font-style: normal; background: var(--success-soft); color: var(--success); padding: 1px 6px; border-radius: 999px; margin-left: 4px; font-size: 10.5px; font-weight: 600; }
.mock-canvas { position: relative; flex: 1; padding: 16px; }
.mock-canvas svg.wires { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }
.mnode { position: absolute; width: 30%; display: flex; align-items: center; gap: 7px; padding: 7px 8px; white-space: nowrap; background: var(--surface); border: 1px solid var(--border); border-left: 3px solid var(--c, var(--primary)); border-radius: 8px; box-shadow: var(--shadow-sm); font-weight: 600; font-size: 11.5px; color: var(--text); }
.mnode > span:last-child { min-width: 0; overflow: hidden; text-overflow: ellipsis; }
.mnode small { display: block; font-weight: 500; font-size: 10px; color: var(--text-3); overflow: hidden; text-overflow: ellipsis; }
.mnode .ic { width: 22px; height: 22px; border-radius: 6px; display: grid; place-items: center; background: color-mix(in srgb, var(--c, var(--primary)) 14%, white); color: var(--c, var(--primary)); flex: none; }
.mnode .ic svg { width: 13px; height: 13px; }
.trial-toast { position: absolute; left: 16px; right: 16px; bottom: 14px; display: flex; align-items: center; gap: 8px; padding: 9px 11px; border-radius: 10px; background: var(--surface); border: 1px solid #bbf7d0; box-shadow: var(--shadow-md); color: var(--text-2); font-size: 11.5px; }
.trial-toast svg { width: 16px; height: 16px; color: var(--success); flex: none; }
.trial-toast b { color: var(--text); }
.float-card { position: absolute; z-index: 2; background: var(--surface); border: 1px solid var(--border); border-radius: 12px; box-shadow: var(--shadow-lg); padding: 12px 14px; font-size: 12.5px; }
.float-card.approval { left: 8%; bottom: -100px; width: 240px; }
.float-card .k { font-size: 11px; font-weight: 600; color: var(--warning); text-transform: uppercase; letter-spacing: .05em; margin-bottom: 4px; }
.float-card .row { display: flex; gap: 8px; margin-top: 10px; }
.float-card .row span { flex: 1; text-align: center; padding: 6px 0; border-radius: 7px; font-weight: 600; font-size: 12px; }
.float-card .yes { background: var(--primary); color: #fff; } .float-card .no { background: var(--surface-2); border: 1px solid var(--border); color: var(--text-2); }
.hero-visual { position: relative; }

/* ---------- Strip ---------- */
.strip { border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); background: var(--surface-2); }
.strip-inner { display: grid; grid-template-columns: repeat(4, 1fr); }
.strip-item { padding: 26px 20px; border-right: 1px solid var(--border); }
.strip-item:last-child { border-right: 0; }
.strip-item strong { display: block; font-size: 17px; letter-spacing: -.01em; }
.strip-item span { color: var(--text-2); font-size: 14.5px; }

/* ---------- Steps (how it works) ---------- */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; counter-reset: step; }
.step { position: relative; padding: 24px 22px; border-radius: var(--radius-lg); background: var(--surface); border: 1px solid var(--border); box-shadow: var(--shadow-sm); }
.step::before { counter-increment: step; content: counter(step); display: grid; place-items: center; width: 32px; height: 32px; border-radius: 9px; background: var(--primary-soft); color: var(--primary); font-weight: 750; margin-bottom: 16px; }
.step h3 { font-size: 18px; margin-bottom: 8px; }
.step p { color: var(--text-2); font-size: 15px; }
.step .tag { display: inline-block; margin-top: 14px; font-size: 12.5px; font-weight: 600; color: var(--success); background: var(--success-soft); padding: 3px 9px; border-radius: 999px; }

/* ---------- Split rows ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(32px, 6vw, 80px); align-items: center; }
.split + .split { margin-top: clamp(64px, 9vw, 104px); }
.split.reverse .split-text { order: 2; }
.split-text h3 { font-size: clamp(24px, 3vw, 32px); font-weight: 750; }
.split-text > p { margin-top: 14px; color: var(--text-2); font-size: 17px; }
.checks { list-style: none; padding: 0; margin: 22px 0 0; display: grid; gap: 12px; }
.checks li { display: grid; grid-template-columns: 22px 1fr; gap: 10px; color: var(--text-2); font-size: 15.5px; }
.checks li svg { width: 20px; height: 20px; color: var(--primary); margin-top: 2px; }
.checks li b { color: var(--text); font-weight: 600; }
.panel { border-radius: var(--radius-lg); background: var(--surface); border: 1px solid var(--border); box-shadow: var(--shadow-md); overflow: hidden; }
.panel-head { display: flex; align-items: center; gap: 10px; padding: 12px 16px; border-bottom: 1px solid var(--border); background: var(--surface-2); font-weight: 600; font-size: 14px; }
.panel-head .badge { margin-left: auto; }
.panel-body { padding: 16px; display: grid; gap: 10px; font-size: 14px; }
.badge { display: inline-flex; align-items: center; gap: 5px; font-size: 12px; font-weight: 600; padding: 3px 9px; border-radius: 999px; background: var(--surface-2); border: 1px solid var(--border); color: var(--text-2); }
.badge.ok { background: var(--success-soft); color: var(--success); border-color: #bbf7d0; }
.badge.warn { background: var(--warning-soft); color: var(--warning); border-color: #fde68a; }
.badge.info { background: var(--primary-soft); color: var(--primary); border-color: #bfdbfe; }
.check-row { display: flex; align-items: center; gap: 10px; padding: 10px 12px; border-radius: 9px; border: 1px solid var(--border); background: var(--surface); }
.check-row svg { width: 17px; height: 17px; flex: none; color: var(--success); }
.check-row.fixed svg { color: var(--warning); }
.check-row span { flex: 1; }
.log { font-family: var(--mono); font-size: 12.5px; line-height: 1.7; color: var(--text-2); background: var(--surface-2); border: 1px solid var(--border); border-radius: 9px; padding: 12px 14px; }
.log b { color: var(--success); font-weight: 600; } .log i { color: var(--warning); font-style: normal; }
.mini-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.mini-table th { text-align: left; font-size: 11px; text-transform: uppercase; letter-spacing: .05em; color: var(--text-3); padding: 6px 8px; border-bottom: 1px solid var(--border); }
.mini-table td { padding: 7px 8px; border-bottom: 1px solid var(--border); color: var(--text-2); }
.mini-table tr:last-child td { border-bottom: 0; }
.mini-table td:first-child { color: var(--text); font-weight: 500; }

/* ---------- Feature grid ---------- */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feature { padding: 24px; border-radius: var(--radius-lg); background: var(--surface); border: 1px solid var(--border); transition: box-shadow .2s, transform .2s, border-color .2s; }
.feature:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); border-color: var(--border-strong); }
.feature .icon { width: 42px; height: 42px; border-radius: 11px; display: grid; place-items: center; margin-bottom: 16px; background: color-mix(in srgb, var(--c, var(--primary)) 12%, white); color: var(--c, var(--primary)); }
.feature .icon svg { width: 21px; height: 21px; }
.feature h3 { font-size: 17.5px; margin-bottom: 8px; }
.feature p { color: var(--text-2); font-size: 15px; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 14px; }
.chips span { font-size: 12px; padding: 3px 9px; border-radius: 999px; background: var(--surface-2); border: 1px solid var(--border); color: var(--text-2); }

/* ---------- Dark: trust ---------- */
.trust-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--navy-border); border: 1px solid var(--navy-border); border-radius: var(--radius-lg); overflow: hidden; }
.trust { padding: 28px 26px; background: var(--navy); }
.trust svg { width: 24px; height: 24px; color: #7da6ff; margin-bottom: 14px; }
.trust h3 { font-size: 17px; margin-bottom: 8px; }
.trust p { font-size: 15px; color: var(--navy-muted); }

/* ---------- Use cases ---------- */
.cases { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.case { padding: 26px; border-radius: var(--radius-lg); border: 1px solid var(--border); background: var(--surface); display: flex; flex-direction: column; gap: 12px; }
.case h3 { font-size: 19px; }
.case p { color: var(--text-2); font-size: 15px; }
.flowline { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; margin-top: auto; padding-top: 6px; }
.flowline span { font-size: 12.5px; font-weight: 600; padding: 5px 10px; border-radius: 8px; background: var(--surface-2); border: 1px solid var(--border); color: var(--text); }
.flowline svg { width: 14px; height: 14px; color: var(--text-3); }
.flowline span.human { background: var(--warning-soft); border-color: #fde68a; color: #92400e; }
.flowline span.send { background: var(--primary-soft); border-color: #bfdbfe; color: var(--primary-hover); }

/* ---------- Deploy ---------- */
.deploy { display: grid; grid-template-columns: 1.1fr 1fr; gap: clamp(28px, 5vw, 64px); align-items: center; }
.code { font-family: var(--mono); font-size: 13.5px; line-height: 1.8; background: var(--navy); color: #e2e8f0; padding: 22px 24px; border-radius: var(--radius-lg); box-shadow: var(--shadow-lg); overflow-x: auto; }
.code .c { color: #64748b; } .code .p { color: #7da6ff; }
.models { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
.models span { padding: 7px 12px; border-radius: 10px; border: 1px solid var(--border); background: var(--surface); font-weight: 600; font-size: 13.5px; }

/* ---------- FAQ ---------- */
.faq { max-width: 820px; margin: 0 auto; display: grid; gap: 10px; }
.faq details { border: 1px solid var(--border); border-radius: 12px; background: var(--surface); padding: 0 20px; }
.faq summary { cursor: pointer; list-style: none; padding: 18px 0; font-weight: 600; font-size: 16.5px; display: flex; align-items: center; gap: 12px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: ''; margin-left: auto; width: 10px; height: 10px; border-right: 2px solid var(--text-3); border-bottom: 2px solid var(--text-3); transform: rotate(45deg); transition: transform .2s; flex: none; }
.faq details[open] summary::after { transform: rotate(-135deg); }
.faq details p { padding: 0 0 18px; color: var(--text-2); }

/* ---------- CTA + footer ---------- */
.cta { position: relative; overflow: hidden; border-radius: 22px; padding: clamp(36px, 6vw, 64px); text-align: center; color: #fff;
  background: radial-gradient(600px 300px at 15% 0%, rgba(125, 166, 255, .35), transparent 60%), linear-gradient(135deg, #1d4ed8, #4f46e5 55%, #6d28d9); }
.cta h2 { font-size: clamp(28px, 4vw, 40px); color: #fff; }
.cta p { margin: 14px auto 0; max-width: 560px; color: #dbe5ff; font-size: 17.5px; }
.cta .hero-actions { justify-content: center; }
.cta .btn-primary { background: #fff; color: var(--primary-hover); box-shadow: none; }
.cta .btn-primary:hover { background: #eef2ff; color: var(--primary-hover); }
.cta .btn-ghost { background: transparent; color: #fff; border-color: rgba(255, 255, 255, .45); }
.cta .btn-ghost:hover { background: rgba(255, 255, 255, .1); color: #fff; }
.site-footer { background: var(--navy); color: var(--navy-muted); padding: 48px 0 36px; font-size: 14.5px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr repeat(3, 1fr); gap: 28px; }
.site-footer .brand { color: #fff; }
.site-footer .brand-name span { color: #7da6ff; }
.site-footer h4 { color: #fff; font-size: 14px; margin-bottom: 12px; }
.site-footer ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.site-footer a { color: var(--navy-muted); }
.site-footer a:hover { color: #fff; }
.footer-note { margin-top: 36px; padding-top: 20px; border-top: 1px solid var(--navy-border); display: flex; flex-wrap: wrap; gap: 12px; justify-content: space-between; }

/* ---------- Reveal on scroll ---------- */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; transition: none; } html { scroll-behavior: auto; } .feature, .btn { transition: none; } }

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .hero-grid, .split, .deploy { grid-template-columns: 1fr; }
  .split.reverse .split-text { order: 0; }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .grid-3, .trust-grid { grid-template-columns: repeat(2, 1fr); }
  .float-card.approval { left: auto; right: 12px; bottom: -22px; }
}
@media (max-width: 860px) {
  .nav-links, .nav-cta { display: none; }
  .menu-toggle { display: inline-flex; }
  .site-header.open .nav-links { display: flex; flex-direction: column; gap: 0; position: absolute; top: 68px; left: 0; right: 0; background: var(--surface); border-bottom: 1px solid var(--border); padding: 8px var(--gutter) 16px; margin: 0; box-shadow: var(--shadow-md); }
  .site-header.open .nav-links a { padding: 12px 0; border-bottom: 1px solid var(--border); font-size: 16px; }
  .strip-inner { grid-template-columns: repeat(2, 1fr); }
  .strip-item:nth-child(2) { border-right: 0; }
  .strip-item:nth-child(-n+2) { border-bottom: 1px solid var(--border); }
  .cases { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  .mock-body { grid-template-columns: 1fr; }
  .mock-chat { border-right: 0; border-bottom: 1px solid var(--border); }
  .mock-canvas { min-height: 300px; }
  .steps, .grid-3, .trust-grid { grid-template-columns: 1fr; }
  .float-card.approval { display: none; }
  .hero-actions .btn { flex: 1; }
  .footer-grid { grid-template-columns: 1fr; }
}