/* Archadio landing page (RFC-012 §4). Placeholder brand (§4.5): the app's accent blue, an amber "live path", ink / paper neutrals. */
:root {
  --accent: #2f6fde;
  --accent-strong: #2459b8;
  --accent-soft: #e5eefc;
  --signal: #f5a524;
  --signal-ink: #8a5a00;
  --ink: #0f172a;
  --ink-2: #334155;
  --muted: #5b6577;
  --line: #dbe2ec;
  --line-2: #c7d1de;
  --paper: #f8fafc;
  --card: #ffffff;
  --grid: rgba(15, 23, 42, 0.045);
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.06), 0 8px 24px rgba(15, 23, 42, 0.06);
  --radius: 14px;
  --font: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "Cascadia Code", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --accent: #5b8ff0;
    --accent-strong: #86abf5;
    --accent-soft: #1f2d48;
    --signal: #f7b749;
    --signal-ink: #f7b749;
    --ink: #e2e8f0;
    --ink-2: #c3cddb;
    --muted: #94a0b4;
    --line: #233046;
    --line-2: #2f3e57;
    --paper: #0b1220;
    --card: #111a2b;
    --grid: rgba(226, 232, 240, 0.05);
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 10px 30px rgba(0, 0, 0, 0.35);
    color-scheme: dark;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0; background: var(--paper); color: var(--ink); font-family: var(--font); font-size: 17px; line-height: 1.6;
  -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
}
img, svg { display: block; max-width: 100%; }
a { color: var(--accent); text-underline-offset: 3px; }
a:hover { color: var(--accent-strong); }
:focus-visible { outline: 3px solid var(--signal); outline-offset: 3px; border-radius: 6px; }
h1, h2, h3 { line-height: 1.15; letter-spacing: -0.02em; margin: 0; }
p { margin: 0; }
.mono { font-family: var(--mono); }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.trap { position: absolute; left: -10000px; top: auto; width: 1px; height: 1px; overflow: hidden; }
.skip { position: absolute; left: 16px; top: -60px; background: var(--card); color: var(--ink); padding: 8px 14px; border-radius: 8px; z-index: 100; box-shadow: var(--shadow); }
.skip:focus { top: 12px; }

.wrap { width: 100%; max-width: 1160px; margin: 0 auto; padding: 0 16px; }
@media (min-width: 768px) { .wrap { padding: 0 32px; } }
section { padding: 72px 0; }
@media (min-width: 900px) { section { padding: 104px 0; } }
.eyebrow { font-family: var(--mono); font-size: 13px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--accent); margin-bottom: 14px; }
.section-title { font-size: clamp(30px, 4.2vw, 46px); font-weight: 750; max-width: 18ch; }
.lead { font-size: clamp(18px, 2vw, 21px); color: var(--ink-2); max-width: 60ch; margin-top: 18px; }

/* ---- buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 48px; padding: 12px 22px; border-radius: 999px;
  font: 600 16px/1 var(--font); text-decoration: none; border: 1px solid transparent; cursor: pointer; transition: transform .15s ease, background .15s ease, box-shadow .15s ease;
}
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 6px 18px rgba(47, 111, 222, 0.28); }
.btn-primary:hover { background: var(--accent-strong); color: #fff; transform: translateY(-1px); }
@media (prefers-color-scheme: dark) { .btn-primary { color: #0b1220; } .btn-primary:hover { color: #0b1220; } }
.btn-ghost { color: var(--ink); border-color: var(--line-2); background: transparent; }
.btn-ghost:hover { color: var(--ink); border-color: var(--accent); }
.btn-small { min-height: 40px; padding: 8px 16px; font-size: 15px; }
.btn[disabled] { opacity: .6; cursor: progress; transform: none; }

/* ---- header */
.site-header { position: sticky; top: 0; z-index: 50; background: color-mix(in srgb, var(--paper) 85%, transparent); backdrop-filter: saturate(1.4) blur(10px); border-bottom: 1px solid transparent; }
.site-header.scrolled { border-bottom-color: var(--line); }
.nav { display: flex; align-items: center; gap: 16px; height: 68px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-weight: 650; font-size: 20px; letter-spacing: -0.03em; }
.brand:hover { color: var(--ink); }
.brand svg { width: 30px; height: 30px; }
.nav-links { display: none; gap: 26px; margin-left: 28px; }
.nav-links a { color: var(--ink-2); text-decoration: none; font-size: 15px; }
.nav-links a:hover { color: var(--ink); }
.nav-spacer { flex: 1; }
.nav-signin { display: none; color: var(--ink-2); text-decoration: none; font-size: 15px; }
@media (min-width: 860px) { .nav-links, .nav-signin { display: inline-flex; } }

/* ---- the keystone mark */
.mark .edge { stroke: currentColor; stroke-width: 2; stroke-linecap: round; fill: none; }
.mark .node { fill: var(--paper); stroke: currentColor; stroke-width: 2; }
.mark .key { fill: var(--accent); stroke: var(--accent); stroke-width: 2; }

/* ---- hero */
.hero { padding: 40px 0 72px; position: relative; overflow: hidden; }
.hero::before {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background-image: linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 32px 32px; mask-image: radial-gradient(ellipse 80% 70% at 60% 40%, #000 30%, transparent 75%);
}
.hero-grid { display: grid; gap: 40px; align-items: center; }
@media (min-width: 980px) { .hero { padding: 64px 0 112px; } .hero-grid { grid-template-columns: 1fr 1.08fr; gap: 56px; } }
.pill { display: inline-flex; align-items: center; gap: 8px; padding: 6px 12px; border-radius: 999px; border: 1px solid var(--line-2); background: var(--card); font-size: 13px; color: var(--ink-2); }
.pill .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--signal); box-shadow: 0 0 0 4px color-mix(in srgb, var(--signal) 25%, transparent); }
.hero h1 { font-size: clamp(42px, 7vw, 76px); font-weight: 800; letter-spacing: -0.035em; margin-top: 22px; max-width: 12ch; }
.hero h1 em { font-style: normal; background: linear-gradient(100deg, var(--accent) 10%, var(--signal) 95%); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero .lead { margin-top: 22px; }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.hero-note { margin-top: 18px; font-size: 14px; color: var(--muted); }

/* ---- the living map (hero illustration) */
.map-card { margin: 0; min-width: 0; background: var(--card); border: 1px solid var(--line); border-radius: 20px; box-shadow: var(--shadow); padding: 14px 14px 10px; position: relative; }
.map-bar { display: flex; align-items: center; gap: 8px; padding: 2px 6px 10px; font-family: var(--mono); font-size: 12px; color: var(--muted); white-space: nowrap; overflow: hidden; }
@media (max-width: 520px) { .map-bar .where { display: none; } .map-card { padding: 10px 8px 8px; } }
.map-bar .dots { display: inline-flex; gap: 5px; margin-right: 6px; }
.map-bar .dots i { width: 9px; height: 9px; border-radius: 50%; background: var(--line-2); }
.map-bar .trace-label { margin-left: auto; color: var(--signal-ink); }
.map { width: 100%; height: auto; }
.map .grid-dot { fill: var(--line); }
.map .edge { fill: none; stroke: var(--line-2); stroke-width: 1.6; }
.map .edge.async { stroke-dasharray: 5 5; }
.map .trace { fill: none; stroke: var(--signal); stroke-width: 2.6; stroke-linecap: round; stroke-dasharray: 1; stroke-dashoffset: 1; }
.map .box { fill: var(--card); stroke: var(--line-2); stroke-width: 1.4; }
.map .n-service .box { stroke: color-mix(in srgb, var(--accent) 55%, var(--line-2)); }
.map .n-channel .box { stroke: color-mix(in srgb, var(--accent) 35%, var(--line-2)); stroke-dasharray: 4 3; }
.map .n-store .box { fill: color-mix(in srgb, var(--accent-soft) 60%, var(--card)); }
.map .n-external .box { stroke-dasharray: 2 3; }
.map .kind { font: 600 8.5px var(--mono); letter-spacing: .08em; text-transform: uppercase; fill: var(--muted); }
.map .name { font: 600 12.5px var(--mono); fill: var(--ink); }
.map .hot .box { transition: stroke .3s ease, fill .3s ease; }
.map .hot.lit .box { stroke: var(--signal); stroke-width: 2; fill: color-mix(in srgb, var(--signal) 12%, var(--card)); }
.map .ping { fill: none; stroke: var(--signal); stroke-width: 2; opacity: 0; }
.map.run .trace { animation: draw .55s ease-out forwards; }
.map.run .ping { animation: ping 2.4s ease-out 0.2s 2; }
.map.run .t1 { animation-delay: .3s; } .map.run .t2 { animation-delay: .95s; } .map.run .t3 { animation-delay: 1.6s; }
.map.run .t4 { animation-delay: 2.25s; } .map.run .t5 { animation-delay: 2.9s; }
@keyframes draw { to { stroke-dashoffset: 0; } }
@keyframes ping { 0% { opacity: .9; transform: scale(1); } 100% { opacity: 0; transform: scale(1.7); } }
.map .ping { transform-box: fill-box; transform-origin: center; }
.map.done .trace { stroke-dashoffset: 0; animation: none; }
.map.static .trace { stroke-dashoffset: 0; }
.map.static .hot .box { stroke: var(--signal); stroke-width: 2; fill: color-mix(in srgb, var(--signal) 12%, var(--card)); }
.map-caption { font-size: 13px; color: var(--muted); padding: 8px 6px 4px; display: flex; gap: 14px; flex-wrap: wrap; }
.map-caption .k { display: inline-flex; align-items: center; gap: 6px; }
.map-caption .k::before { content: ""; width: 18px; height: 0; border-top: 2px solid var(--line-2); }
.map-caption .k.async::before { border-top-style: dashed; }
.map-caption .k.live::before { border-top: 3px solid var(--signal); }

/* ---- problem */
.problem { background: var(--card); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.punches { display: grid; gap: 18px; margin-top: 44px; }
@media (min-width: 860px) { .punches { grid-template-columns: repeat(3, 1fr); gap: 24px; } }
.punch { padding: 26px; border-radius: var(--radius); border: 1px solid var(--line); background: var(--paper); }
.punch h3 { font-size: 21px; font-weight: 700; }
.punch p { margin-top: 10px; color: var(--ink-2); }
.punch .num { font-family: var(--mono); font-size: 13px; color: var(--signal-ink); margin-bottom: 14px; display: block; }

/* ---- how it works */
.steps { display: grid; gap: 18px; margin: 48px 0 0; padding: 0; list-style: none; position: relative; }
@media (min-width: 900px) {
  .steps { grid-template-columns: repeat(4, 1fr); gap: 22px; }
  .steps::before { content: ""; position: absolute; top: 23px; left: 6%; right: 6%; border-top: 2px dashed var(--line-2); z-index: 0; }
}
.step { position: relative; z-index: 1; }
.step .marker {
  width: 48px; height: 48px; border-radius: 50%; display: grid; place-items: center; background: var(--card); border: 2px solid var(--accent);
  font: 700 16px var(--mono); color: var(--accent); margin-bottom: 18px;
}
.step:nth-child(2) .marker { border-color: var(--signal); color: var(--signal-ink); }
.step h3 { font-size: 21px; font-weight: 700; }
.step p { margin-top: 8px; color: var(--ink-2); }

/* ---- Claude section */
.claude { background: linear-gradient(180deg, var(--paper), color-mix(in srgb, var(--accent-soft) 45%, var(--paper))); }
.split { display: grid; gap: 40px; align-items: center; }
@media (min-width: 960px) { .split { grid-template-columns: 1fr 1fr; gap: 64px; } }
.checks { list-style: none; padding: 0; margin: 26px 0 0; display: grid; gap: 12px; }
.checks li { display: flex; gap: 12px; align-items: flex-start; color: var(--ink-2); }
.checks li::before { content: "\2713"; flex: none; width: 22px; height: 22px; margin-top: 3px; border-radius: 50%; display: grid; place-items: center;
  background: var(--accent-soft); color: var(--accent); font: 700 13px/1 var(--font); }
.checks li strong { color: var(--ink); }

.plan { background: var(--card); border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow); overflow: hidden; font-size: 15px; }
.plan-head { display: flex; align-items: center; gap: 10px; padding: 14px 18px; border-bottom: 1px solid var(--line); }
.plan-head .title { font-weight: 700; }
.plan-head .tag { margin-left: auto; font: 600 11px var(--mono); text-transform: uppercase; letter-spacing: .06em; color: var(--accent); background: var(--accent-soft); padding: 4px 8px; border-radius: 6px; }
.plan-meta { padding: 10px 18px; font: 12.5px var(--mono); color: var(--muted); border-bottom: 1px solid var(--line); }
.plan-rows { list-style: none; margin: 0; padding: 8px 0; }
.plan-rows li { display: grid; grid-template-columns: 26px 1fr auto; align-items: center; gap: 10px; padding: 9px 18px; }
.plan-rows .op { font: 700 15px var(--mono); text-align: center; border-radius: 6px; line-height: 24px; }
.op.add { color: #0f8a4a; background: color-mix(in srgb, #12b76a 14%, transparent); }
.op.chg { color: var(--accent); background: var(--accent-soft); }
.op.del { color: #c4320a; background: color-mix(in srgb, #f04438 13%, transparent); }
.op.cfl { color: var(--signal-ink); background: color-mix(in srgb, var(--signal) 18%, transparent); }
@media (prefers-color-scheme: dark) { .op.add { color: #47cd89; } .op.del { color: #f97066; } }
.plan-rows .what { color: var(--ink-2); }
.plan-rows .what code { font-family: var(--mono); font-size: 13px; color: var(--ink); }
.plan-rows .n { font: 600 13px var(--mono); color: var(--muted); }
.plan-foot { display: flex; gap: 10px; justify-content: flex-end; padding: 14px 18px; border-top: 1px solid var(--line); background: var(--paper); }
.fake-btn { font: 600 13px var(--font); padding: 8px 14px; border-radius: 999px; border: 1px solid var(--line-2); color: var(--ink-2); }
.fake-btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
@media (prefers-color-scheme: dark) { .fake-btn.primary { color: #0b1220; } }
.illus-note { font-size: 13px; color: var(--muted); margin-top: 10px; text-align: right; }

/* ---- features */
.tiles { display: grid; gap: 18px; margin-top: 48px; }
@media (min-width: 700px) { .tiles { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1040px) { .tiles { grid-template-columns: repeat(3, 1fr); gap: 22px; } }
.tile { padding: 26px; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); transition: border-color .2s ease, transform .2s ease; }
.tile:hover { border-color: color-mix(in srgb, var(--accent) 50%, var(--line)); transform: translateY(-2px); }
.tile .icon { width: 42px; height: 42px; border-radius: 12px; display: grid; place-items: center; background: var(--accent-soft); color: var(--accent); margin-bottom: 18px; }
.tile .icon svg { width: 24px; height: 24px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.tile:first-child .icon { background: color-mix(in srgb, var(--signal) 18%, transparent); color: var(--signal-ink); }
.tile h3 { font-size: 19px; font-weight: 700; }
.tile p { margin-top: 8px; color: var(--ink-2); font-size: 16px; }

/* ---- moments */
.moments { padding-top: 0; }
.moments-inner { border: 1px solid var(--line); border-radius: 20px; background: var(--card); padding: 32px; display: grid; gap: 20px; align-items: center; }
@media (min-width: 900px) { .moments-inner { grid-template-columns: auto 1fr; gap: 40px; padding: 36px 40px; } }
.moments h2 { font-size: 24px; font-weight: 750; max-width: 14ch; }
.chips { display: flex; flex-wrap: wrap; gap: 10px; list-style: none; padding: 0; margin: 0; }
.chips li { padding: 9px 16px; border-radius: 999px; border: 1px solid var(--line-2); background: var(--paper); font-size: 15px; color: var(--ink-2); }

/* ---- beta + form */
.beta { background: var(--card); border-top: 1px solid var(--line); }
.beta-grid { display: grid; gap: 40px; }
@media (min-width: 980px) { .beta-grid { grid-template-columns: 0.9fr 1.1fr; gap: 64px; align-items: start; } }
.beta-points { list-style: none; padding: 0; margin: 28px 0 0; display: grid; gap: 16px; }
.beta-points li { padding-left: 30px; position: relative; color: var(--ink-2); }
.beta-points li::before { content: ""; position: absolute; left: 4px; top: 9px; width: 10px; height: 10px; border-radius: 50%; border: 2px solid var(--accent); }
.beta-points li:first-child::before { background: var(--signal); border-color: var(--signal); }
.form-card { background: var(--paper); border: 1px solid var(--line); border-radius: 20px; padding: 24px; }
@media (min-width: 700px) { .form-card { padding: 32px; } }
.fields { display: grid; gap: 18px; }
.fields .two { display: grid; gap: 18px; align-items: end; }
@media (min-width: 700px) { .fields .two { grid-template-columns: 1fr 1fr; } }
/* errors under a field would push its neighbour out of line: keep each field's own top */
.fields .two:has(.has-error) { align-items: start; }
.field label, .field .label { display: block; font-weight: 600; font-size: 15px; margin-bottom: 6px; }
.field .opt { font-weight: 400; color: var(--muted); }
.input, select.input, textarea.input {
  width: 100%; min-height: 48px; padding: 11px 14px; border-radius: 10px; border: 1px solid var(--line-2); background: var(--card); color: var(--ink);
  font: 16px/1.4 var(--font); transition: border-color .15s ease, box-shadow .15s ease;
}
textarea.input { min-height: 110px; resize: vertical; }
.input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 20%, transparent); }
.field.has-error .input { border-color: #d92d20; }
.field .error { color: #d92d20; font-size: 14px; margin-top: 6px; }
@media (prefers-color-scheme: dark) { .field.has-error .input { border-color: #f97066; } .field .error { color: #f97066; } }
.consent { display: flex; gap: 10px; align-items: flex-start; font-size: 15px; color: var(--ink-2); }
.consent input { width: 20px; height: 20px; margin-top: 2px; accent-color: var(--accent); flex: none; }
.form-actions { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; margin-top: 6px; }
.form-status { font-size: 15px; color: var(--ink-2); }
.form-status.bad { color: #d92d20; }
@media (prefers-color-scheme: dark) { .form-status.bad { color: #f97066; } }
.thanks { text-align: left; padding: 8px 0; }
.thanks .big { font-size: 28px; font-weight: 750; letter-spacing: -0.02em; }
.thanks p { margin-top: 10px; color: var(--ink-2); }
.thanks svg { width: 56px; height: 56px; margin-bottom: 18px; }
.thanks .ring { fill: none; stroke: var(--signal); stroke-width: 3; }
.thanks .tick { fill: none; stroke: var(--accent); stroke-width: 3.5; stroke-linecap: round; stroke-linejoin: round; }

/* ---- FAQ */
.faq-list { margin-top: 40px; display: grid; gap: 12px; max-width: 860px; }
.faq-list details { border: 1px solid var(--line); border-radius: 14px; background: var(--card); padding: 0 22px; }
.faq-list summary { cursor: pointer; list-style: none; padding: 18px 0; font-weight: 650; font-size: 18px; display: flex; gap: 12px; align-items: center; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: "+"; margin-left: auto; font: 500 22px var(--mono); color: var(--accent); transition: transform .2s ease; }
.faq-list details[open] summary::after { transform: rotate(45deg); }
.faq-list details p { padding: 0 0 20px; color: var(--ink-2); max-width: 70ch; }

/* ---- footer */
.site-footer { border-top: 1px solid var(--line); padding: 40px 0 48px; color: var(--muted); font-size: 15px; }
.foot { display: grid; gap: 20px; }
@media (min-width: 800px) { .foot { grid-template-columns: 1fr auto; align-items: center; } }
.foot .brand { font-size: 18px; }
.foot .tagline { margin-top: 8px; }
.foot nav { display: flex; flex-wrap: wrap; gap: 20px; }
.foot nav a { color: var(--ink-2); text-decoration: none; }
.foot nav a:hover { color: var(--ink); }

/* ---- simple pages (privacy, terms, 404, thanks) */
.page { max-width: 760px; padding: 56px 16px 80px; margin: 0 auto; }
.page h1 { font-size: clamp(34px, 5vw, 48px); font-weight: 800; }
.page h2 { font-size: 22px; margin-top: 36px; }
.page p, .page li { color: var(--ink-2); margin-top: 12px; }
.page ul { padding-left: 22px; }
.page .updated { color: var(--muted); font-size: 14px; margin-top: 10px; }
.center-page { min-height: 70vh; display: grid; place-items: center; text-align: center; }
.center-page .page { padding-top: 40px; }
.center-page .cta-row { justify-content: center; }

/* ---- entrance */
.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; } }
.no-js .reveal { opacity: 1; transform: none; }