/* DeviceSign marketing site.
   One stylesheet, tokens first. The product name appears in exactly one
   place in Dart (lib/constants/brand.dart), so renaming is a one-line job. */

:root {
  /* Amber on a warm near-black. The neutrals are warm on purpose: amber
     over a blue-black reads as a warning, over a warm dark it reads as
     brand. Every accent is a token, so the palette changes here only. */
  --bg: #100d08;
  --bg-soft: #17130c;
  --surface: #1d1810;
  --surface-2: #251e14;
  --line: #3a2f1e;
  --text: #f6efe2;
  --muted: #b6a891;
  --accent: #ffb224;
  --accent-strong: #e0940b;
  --accent-soft: rgba(255, 178, 36, .14);
  /* The second stop in the brand gradient. Amber to orange stays in family;
     amber to the green below would fight it. */
  --accent-2: #ff7a2f;
  /* Kept green, warmed towards lime: a tick and a precision figure have to
     read as "good", which amber cannot do next to amber. */
  --good: #a8d95f;
  --good-soft: rgba(168, 217, 95, .14);
  --warn: #ff8a3d;
  --radius: 14px;
  --radius-lg: 22px;
  --page: 1120px;
  --font: Roboto, 'Helvetica Neue', Arial, sans-serif;
  --mono: 'Roboto Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--text); font-family: var(--font); line-height: 1.6; }
body { -webkit-font-smoothing: antialiased; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4 { margin: 0; line-height: 1.15; letter-spacing: -0.02em; }
p { margin: 0; }
code { font-family: var(--mono); font-size: .9em; }

.wrap { width: 100%; max-width: var(--page); margin: 0 auto; padding: 0 24px; }
.muted { color: var(--muted); }
.center { text-align: center; }

/* Navigation */
.nav { position: sticky; top: 0; z-index: 20; background: rgba(16, 13, 8, .85); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; height: 68px; }
.nav-actions { display: flex; align-items: center; gap: 8px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; color: var(--text); letter-spacing: -0.01em; }
.brand:hover { text-decoration: none; }
.brand-mark { width: 26px; height: 26px; border-radius: 8px; background: linear-gradient(135deg, var(--accent), var(--accent-2)); display: inline-block; }
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a { color: var(--muted); font-size: 15px; }
.nav-links a:hover, .nav-links a.active { color: var(--text); text-decoration: none; }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; height: 46px; padding: 0 22px; border-radius: 999px; border: 1px solid var(--line); background: transparent; color: var(--text); font-size: 15px; font-weight: 600; cursor: pointer; }
.btn:hover { border-color: var(--accent); text-decoration: none; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #241803; }
.btn.primary:hover { background: var(--accent-strong); border-color: var(--accent-strong); color: #1a1102; }
.btn.sm { height: 38px; padding: 0 16px; font-size: 14px; }

/* Hero */
.hero { padding: 96px 0 72px; background: radial-gradient(1000px 500px at 50% -10%, rgba(255,178,36,.16), transparent 70%); }
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; padding: 6px 14px; border-radius: 999px; background: var(--accent-soft); color: var(--accent); font-size: 13px; font-weight: 600; }
.hero h1 { font-size: 58px; font-weight: 800; margin: 20px 0 18px; }
.hero h1 .grad { background: linear-gradient(120deg, var(--accent), var(--accent-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p.lead { font-size: 19px; color: var(--muted); max-width: 34em; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 30px; }
.hero-note { margin-top: 16px; font-size: 14px; color: var(--muted); }

/* Code */
/* Darker than --bg so the snippet reads as inset, and warm like it. */
.code { background: #0c0a06; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; box-shadow: 0 24px 60px rgba(0,0,0,.45); }
.code-head { display: flex; align-items: center; gap: 8px; padding: 12px 16px; border-bottom: 1px solid var(--line); color: var(--muted); font-size: 13px; font-family: var(--mono); }
.dot { width: 10px; height: 10px; border-radius: 50%; background: var(--line); }
.code pre { margin: 0; padding: 18px 20px; overflow-x: auto; font-family: var(--mono); font-size: 13.5px; line-height: 1.65; color: #ede3d2; }
.code pre .c { color: #8a7c66; }
.code pre .k { color: #ffb224; }
.code pre .s { color: #a8d95f; }

/* Stat strip */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin: 56px 0 0; }
.stat { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; }
.stat .n { font-size: 30px; font-weight: 800; letter-spacing: -0.02em; }
.stat .n.good { color: var(--good); }
.stat .l { color: var(--muted); font-size: 13px; margin-top: 4px; }

/* Sections */
.section { padding: 84px 0; border-top: 1px solid var(--line); }
.section-head { max-width: 40em; margin-bottom: 40px; }
.section-head h2 { font-size: 36px; font-weight: 700; margin-bottom: 14px; }
.section-head p { color: var(--muted); font-size: 17px; }

.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.card h3 { font-size: 18px; margin-bottom: 10px; }
.card p { color: var(--muted); font-size: 15px; }
.card .ico { font-size: 22px; margin-bottom: 14px; display: block; }

/* Signal ladder */
.ladder { display: flex; flex-direction: column; gap: 10px; }
.rung { display: grid; grid-template-columns: 42px 1fr auto; gap: 18px; align-items: center; background: var(--surface); border: 1px solid var(--line); border-left: 3px solid var(--accent); border-radius: var(--radius); padding: 18px 22px; }
.rung .step { width: 30px; height: 30px; border-radius: 50%; background: var(--accent-soft); color: var(--accent); display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 14px; }
.rung h4 { font-size: 16px; margin-bottom: 4px; }
.rung p { color: var(--muted); font-size: 14.5px; }
.rung .conf { font-family: var(--mono); font-size: 13px; color: var(--good); background: var(--good-soft); padding: 5px 12px; border-radius: 999px; white-space: nowrap; }
.rung.last { border-left-color: var(--muted); }
.rung.last .conf { color: var(--muted); background: rgba(154,168,192,.12); }

/* Split */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.list { display: flex; flex-direction: column; gap: 16px; }
.list-item { display: grid; grid-template-columns: 24px 1fr; gap: 14px; }
.list-item .tick { color: var(--good); font-weight: 700; }
.list-item p { color: var(--muted); font-size: 15px; }
.list-item strong { color: var(--text); font-weight: 600; }

/* Tables */
.table-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 14px 20px; border-bottom: 1px solid var(--line); font-size: 15px; }
th { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .06em; font-weight: 600; }
tr:last-child td { border-bottom: 0; }
td.num, th.num { text-align: right; font-family: var(--mono); font-size: 14px; }

/* Pricing */
.plans { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; max-width: 840px; margin: 0 auto; }
.plan { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 30px; display: flex; flex-direction: column; gap: 18px; }
.plan.featured { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent), 0 24px 60px rgba(255,178,36,.18); }
.plan .price { font-size: 40px; font-weight: 800; letter-spacing: -0.02em; }
/* The note sits on its own line rather than wrapping mid-phrase: at four
   cards the widest one ("300,000 devices") split across the price line. */
.plan .price span { display: block; font-size: 15px; font-weight: 400; color: var(--muted); line-height: 1.4; }
.plan ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 12px; }
.plan li { display: grid; grid-template-columns: 20px 1fr; gap: 10px; color: var(--muted); font-size: 15px; }
.plan li .tick { color: var(--good); }
.plan li .no { color: var(--muted); opacity: .6; }

/* FAQ */
.faq { display: flex; flex-direction: column; gap: 12px; }
.faq details { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 22px; }
.faq summary { cursor: pointer; font-weight: 600; font-size: 16px; }
.faq details[open] summary { margin-bottom: 10px; }
.faq p { color: var(--muted); font-size: 15px; }

/* CTA + footer */
.cta { background: linear-gradient(135deg, rgba(255,178,36,.18), rgba(255,138,61,.10)); border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 56px 40px; text-align: center; }
.cta h2 { font-size: 34px; margin-bottom: 14px; }
.cta p { color: var(--muted); font-size: 17px; max-width: 32em; margin: 0 auto 26px; }
.footer { border-top: 1px solid var(--line); padding: 40px 0; color: var(--muted); font-size: 14px; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; gap: 20px; flex-wrap: wrap; }
.built-with { display: inline-flex; line-height: 0; opacity: .85; transition: opacity .15s; }
.built-with:hover { opacity: 1; text-decoration: none; }
.footer a { color: var(--muted); }

/* Docs */
.docs { display: grid; grid-template-columns: 220px 1fr; gap: 48px; padding: 56px 0; }
.toc { position: sticky; top: 92px; align-self: start; display: flex; flex-direction: column; gap: 8px; }
.toc a { color: var(--muted); font-size: 14.5px; padding: 4px 0; }
.doc-body { display: flex; flex-direction: column; gap: 34px; min-width: 0; }
.doc-body h2 { font-size: 26px; }
.doc-body h3 { font-size: 18px; margin-top: 8px; }
.doc-body p { color: var(--muted); }
.doc-section { display: flex; flex-direction: column; gap: 14px; }

@media (max-width: 900px) {
  .hero-grid, .split, .stats, .cards, .plans, .docs { grid-template-columns: 1fr; }
  .hero h1 { font-size: 40px; }
  .section-head h2 { font-size: 28px; }
  .nav-links { display: none; }
  .toc { position: static; }
}

/* Sign-up */
.signup { padding-top: 56px; }
.signup-grid { display: grid; grid-template-columns: minmax(0, 420px) 1fr; gap: 56px; align-items: start; }
.signup-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 30px; display: flex; flex-direction: column; gap: 14px; box-shadow: 0 24px 60px rgba(0,0,0,.35); }
.signup-card h2 { font-size: 26px; }
.signup-card .field { display: flex; flex-direction: column; gap: 6px; }
.signup-card label { font-size: 13px; color: var(--muted); }
.signup-card input { background: var(--bg); color: var(--text); border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; font: inherit; font-size: 15px; }
.signup-card input:focus { outline: none; border-color: var(--accent); }
.signup-card .btn.wide { width: 100%; }
.signup-card .btn:disabled { opacity: .45; cursor: not-allowed; }
.signup-card .form-error { background: rgba(231,76,60,.12); border: 1px solid rgba(231,76,60,.45); color: #f1948a; border-radius: 10px; padding: 10px 14px; font-size: 14px; }
.signup-card .tiny { font-size: 12px; }
.signup-card.done { align-items: flex-start; gap: 16px; }
.signup-side { display: flex; flex-direction: column; gap: 18px; padding-top: 12px; }
.signup-side h2 { font-size: 30px; }
@media (max-width: 900px) { .signup-grid { grid-template-columns: 1fr; } }
.plans.four { grid-template-columns: repeat(4, minmax(0, 1fr)); max-width: none; }
@media (max-width: 1000px) { .plans.four { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 620px) { .plans.four { grid-template-columns: 1fr; } }