:root {
  --ink: #101b2d;
  --ink-2: #1b2940;
  --body: #46536a;
  --blue: #0057ff;
  --blue-dark: #0044c7;
  --mint: #9bffda;
  --paper: #ffffff;
  --mist: #f3f6fb;
  --line: #dde3ee;
  --on-ink: #c6d0e0;
  --display: "Sora", "Inter", system-ui, sans-serif;
  --text: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, Menlo, monospace;
  --wrap: 1180px;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; scroll-padding-top: 88px; }
body { margin: 0; font-family: var(--text); color: var(--body); background: var(--paper); line-height: 1.6; font-size: 17px; -webkit-font-smoothing: antialiased; }
img, svg { display: block; max-width: 100%; }
a { color: var(--blue); }
h1, h2, h3 { font-family: var(--display); color: var(--ink); margin: 0; font-weight: 700; }
h2 { font-size: clamp(2rem, 4.4vw, 3.1rem); line-height: 1.08; letter-spacing: -0.03em; }
h3 { font-size: 1.2rem; line-height: 1.25; letter-spacing: -0.01em; }
p { margin: 0; }
:focus-visible { outline: 3px solid var(--blue); outline-offset: 3px; border-radius: 4px; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--ink); color: #fff; padding: 10px 16px; z-index: 50; border-radius: 8px; }
.skip:focus { left: 8px; }
.label { font-family: var(--mono); font-size: 0.8rem; font-weight: 500; letter-spacing: 0.04em; text-transform: uppercase; color: var(--blue); }

/* Header */
.site-header { position: sticky; top: 0; z-index: 20; background: rgba(255, 255, 255, 0.94); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.nav { display: flex; align-items: center; justify-content: space-between; gap: 20px; min-height: 72px; }
.brand img { height: 46px; width: auto; }
.nav-links { display: flex; align-items: center; gap: 30px; }
.nav-links a:not(.btn) { color: var(--ink); text-decoration: none; font-weight: 500; font-size: 0.95rem; }
.nav-links a:not(.btn):hover { color: var(--blue); }

.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 0 24px; border-radius: 12px; font: 600 1rem var(--text); text-decoration: none; border: 2px solid transparent; cursor: pointer; transition: background .15s, color .15s, border-color .15s; }
.btn-primary { background: var(--blue); color: #fff; }
.btn-primary:hover { background: var(--blue-dark); }
.btn-ghost { border-color: var(--line); color: var(--ink); background: #fff; }
.btn-ghost:hover { border-color: var(--ink); }
.nav .btn { min-height: 44px; padding: 0 18px; font-size: 0.95rem; white-space: nowrap; }

/* Hero */
.hero { padding: 72px 0 88px; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 56px; align-items: center; }
.hero h1 { font-size: clamp(2.9rem, 7.2vw, 5.6rem); line-height: 0.98; letter-spacing: -0.045em; margin: 18px 0 26px; }
.hero h1 span { color: var(--blue); display: block; }
.lead { font-size: 1.22rem; line-height: 1.55; max-width: 34em; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }

/* Example thread */
.thread { background: var(--ink); border-radius: 28px; padding: 22px 20px 24px; color: #fff; }
.thread-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 0 4px 16px; border-bottom: 1px solid rgba(255,255,255,.14); font-size: .86rem; color: var(--on-ink); }
.thread-head strong { color: #fff; font-weight: 600; font-size: 1rem; }
.msgs { list-style: none; margin: 18px 0 0; padding: 0; display: flex; flex-direction: column; gap: 10px; min-height: 368px; }
.msg { max-width: 86%; padding: 11px 15px; border-radius: 18px; font-size: .96rem; line-height: 1.4; }
.msg.in { align-self: flex-start; background: var(--ink-2); color: #eef2f8; border-bottom-left-radius: 5px; }
.msg.out { align-self: flex-end; background: var(--blue); color: #fff; border-bottom-right-radius: 5px; }
.msg.tag { align-self: center; max-width: 100%; background: var(--mint); color: var(--ink); font-family: var(--mono); font-size: .78rem; font-weight: 500; padding: 7px 13px; border-radius: 99px; }
.js .thread .msg { opacity: 0; transform: translateY(8px); transition: opacity .35s, transform .35s; }
.js .thread .msg.show { opacity: 1; transform: none; }
.thread-note { margin-top: 14px; font-size: .8rem; color: var(--on-ink); text-align: center; }

/* Sections */
section { padding: 96px 0; }
.head { max-width: 720px; margin-bottom: 52px; }
.head p:not(.label) { margin-top: 16px; font-size: 1.12rem; }
.head .label { margin-bottom: 14px; }

/* Cadence rail */
.mist { background: var(--mist); }
.rail { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, 1fr); position: relative; }
.rail::before { content: ""; position: absolute; left: 0; right: 0; top: 11px; height: 2px; background: var(--blue); }
.rail li { position: relative; padding: 42px 26px 0 0; }
.rail li::before { content: ""; position: absolute; left: 0; top: 0; width: 24px; height: 24px; border-radius: 50%; background: var(--blue); border: 6px solid var(--mist); box-shadow: 0 0 0 2px var(--blue); }
.rail .num { font-family: var(--mono); font-size: .85rem; color: var(--blue); display: block; margin-bottom: 8px; }
.rail h3 { margin-bottom: 8px; }

/* Features */
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 20px; overflow: hidden; }
.feature { background: #fff; padding: 34px 30px 38px; }
.feature svg { width: 28px; height: 28px; color: var(--blue); margin-bottom: 20px; }
.feature h3 { margin-bottom: 8px; }

/* Compliance */
.dark { background: var(--ink); color: var(--on-ink); }
.dark h2, .dark h3 { color: #fff; }
.dark .label { color: var(--mint); }
.dark a { color: var(--mint); }
.comp-grid { display: grid; grid-template-columns: 0.85fr 1.15fr; gap: 64px; align-items: start; }
.rules { list-style: none; margin: 0; padding: 0; }
.rules li { padding: 22px 0; border-top: 1px solid rgba(255,255,255,.16); }
.rules li:last-child { border-bottom: 1px solid rgba(255,255,255,.16); }
.rules h3 { margin-bottom: 4px; }
.keyword { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 26px; }
.keyword span { font-family: var(--mono); font-size: .82rem; color: var(--mint); border: 1px solid rgba(155,255,218,.45); padding: 5px 11px; border-radius: 8px; }

/* FAQ */
.faq-grid { display: grid; grid-template-columns: 0.8fr 1.2fr; gap: 56px; }
details { border-top: 1px solid var(--line); }
details:last-child { border-bottom: 1px solid var(--line); }
summary { cursor: pointer; list-style: none; padding: 20px 36px 20px 0; font: 600 1.08rem var(--display); color: var(--ink); position: relative; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; position: absolute; right: 4px; top: 16px; font-size: 1.5rem; font-weight: 400; color: var(--blue); }
details[open] summary::after { content: "\2212"; }
details p { padding: 0 36px 22px 0; }

/* Demo */
.demo-grid { display: grid; grid-template-columns: 0.85fr 1.15fr; gap: 64px; align-items: start; }
.demo-grid h2 { margin-bottom: 18px; }
.mail { margin-top: 22px; }
form { background: #fff; border: 1px solid var(--line); border-radius: 20px; padding: 32px; display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field.full, .consent, form .btn, .form-note { grid-column: 1 / -1; }
label { font-weight: 600; font-size: .92rem; color: var(--ink); }
input[type=text], input[type=email], input[type=tel], textarea { font: inherit; color: var(--ink); border: 1px solid #8a96a8; border-radius: 10px; padding: 11px 13px; min-height: 48px; width: 100%; background: #fff; }
textarea { min-height: 96px; resize: vertical; }
.consent { display: grid; grid-template-columns: 24px 1fr; gap: 10px; align-items: start; }
.consent input { width: 22px; height: 22px; margin: 2px 0 0; accent-color: var(--blue); }
.consent label { font-weight: 400; font-size: .86rem; line-height: 1.5; color: var(--body); }
.form-note { font-size: .86rem; }
.form-note.err { color: #b42318; }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; opacity: 0; }
.thanks { background: #fff; border: 1px solid var(--line); border-radius: 20px; padding: 40px 32px; }
.thanks svg { width: 40px; height: 40px; color: var(--blue); margin-bottom: 18px; }
.thanks h3 { font-size: 1.5rem; margin-bottom: 10px; }

/* Footer */
.site-footer { border-top: 1px solid var(--line); padding: 44px 0; font-size: .94rem; }
.foot { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 24px; align-items: center; }
.foot img { height: 42px; width: auto; }
.foot-links { display: flex; flex-wrap: wrap; gap: 8px 24px; }
.foot-links a { color: var(--ink); }
.copy { margin-top: 20px; font-size: .86rem; }

/* Legal */
.legal { padding: 64px 0 96px; }
.legal .wrap { max-width: 800px; }
.legal h1 { font-size: clamp(2.2rem, 5vw, 3.2rem); letter-spacing: -0.03em; line-height: 1.1; margin-bottom: 8px; }
.legal .updated { font-family: var(--mono); font-size: .85rem; margin-bottom: 30px; }
.legal h2 { font-size: 1.3rem; letter-spacing: -0.01em; margin: 40px 0 10px; line-height: 1.25; }
.legal p, .legal li { margin-bottom: 10px; }
.legal ul { padding-left: 22px; }
.legal .callout { background: var(--mist); border: 1px solid var(--line); padding: 20px 22px; border-radius: 14px; margin-top: 18px; }

@media (max-width: 920px) {
  .hero-grid, .comp-grid, .faq-grid, .demo-grid { grid-template-columns: 1fr; gap: 44px; }
  .hero { padding: 48px 0 64px; }
  section { padding: 72px 0; }
  .features { grid-template-columns: 1fr 1fr; }
  .rail { grid-template-columns: 1fr; gap: 0; }
  .rail::before { left: 11px; right: auto; top: 0; bottom: 0; width: 2px; height: auto; }
  .rail li { padding: 0 0 34px 46px; }
}
@media (max-width: 620px) {
  .nav-links a:not(.btn) { display: none; }
  .brand img { height: 38px; }
  .features, form { grid-template-columns: 1fr; }
  form { padding: 22px; }
  .hero-cta .btn { flex: 1 1 100%; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .thread .msg { opacity: 1; transform: none; transition: none; }
}