:root {
  --bg: #ffffff;
  --bg-soft: #f6f6f8;
  --bg-card: #ffffff;
  --border: #e3e3e8;
  --text: #17171c;
  --text-muted: #62626e;
  --accent: #3b5bdb;
  --accent-soft: #e7ecfc;
  --accent-text: #ffffff;
  --code-bg: #f1f2f6;
  --shadow: 0 1px 2px rgb(0 0 0 / 0.04), 0 12px 32px rgb(20 30 70 / 0.08);
  --tag-reply: #c2410c;
  --tag-waiting: #7c3aed;
  --tag-fyi: #0f766e;
  --tag-quiet: #6b7280;
  --radius: 12px;
  --max: 1120px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #131316;
    --bg-soft: #1a1a1e;
    --bg-card: #1e1e23;
    --border: #2e2e35;
    --text: #ececf1;
    --text-muted: #9c9ca8;
    --accent: #7c95f5;
    --accent-soft: #232a45;
    --accent-text: #0e1020;
    --code-bg: #24242a;
    --shadow: 0 1px 2px rgb(0 0 0 / 0.3), 0 12px 32px rgb(0 0 0 / 0.35);
    --tag-reply: #fb923c;
    --tag-waiting: #a78bfa;
    --tag-fyi: #2dd4bf;
    --tag-quiet: #9ca3af;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #131316;
  --bg-soft: #1a1a1e;
  --bg-card: #1e1e23;
  --border: #2e2e35;
  --text: #ececf1;
  --text-muted: #9c9ca8;
  --accent: #7c95f5;
  --accent-soft: #232a45;
  --accent-text: #0e1020;
  --code-bg: #24242a;
  --shadow: 0 1px 2px rgb(0 0 0 / 0.3), 0 12px 32px rgb(0 0 0 / 0.35);
  --tag-reply: #fb923c;
  --tag-waiting: #a78bfa;
  --tag-fyi: #2dd4bf;
  --tag-quiet: #9ca3af;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Inter", system-ui, sans-serif;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; }
code, kbd, pre { font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: 0.88em; }
code { overflow-wrap: anywhere; background: var(--code-bg); padding: 0.1em 0.35em; border-radius: 5px; }
pre {
  background: var(--code-bg);
  padding: 14px 16px;
  border-radius: 10px;
  overflow-x: auto;
  line-height: 1.5;
}
pre code { background: none; padding: 0; }
kbd {
  display: inline-block;
  min-width: 1.7em;
  padding: 0.05em 0.45em;
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 6px;
  background: var(--bg-card);
  text-align: center;
}

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 16px; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.site-header .wrap { display: flex; align-items: center; gap: 24px; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 650; }
.brand:hover { text-decoration: none; }
.brand img { width: 28px; height: 28px; border-radius: 7px; }
.site-header nav { display: flex; gap: 20px; margin-left: auto; align-items: center; }
.site-header nav a { color: var(--text-muted); font-size: 15px; }
.site-header nav a:hover, .site-header nav a[aria-current] { color: var(--text); text-decoration: none; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 9px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text);
  font-weight: 550;
  font-size: 15px;
}
.btn:hover { text-decoration: none; border-color: var(--text-muted); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
.btn.primary:hover { filter: brightness(1.08); }
.site-header .btn { padding: 6px 14px; font-size: 14px; color: var(--accent-text); }

/* Hero */
.hero { padding: 88px 0 56px; text-align: center; }
.eyebrow {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 20px;
}
.hero h1 {
  font-size: clamp(36px, 6vw, 60px);
  line-height: 1.08;
  letter-spacing: -0.03em;
  margin: 0 auto 20px;
  max-width: 820px;
}
.hero .lede { font-size: clamp(17px, 2.2vw, 20px); color: var(--text-muted); max-width: 640px; margin: 0 auto 32px; }
.actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.fineprint { color: var(--text-muted); font-size: 13px; margin-top: 14px; }

/* App mock */
.mock {
  margin: 56px auto 0;
  max-width: 980px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--bg-card);
  box-shadow: var(--shadow);
  overflow: hidden;
  text-align: left;
  font-size: 13.5px;
}
.mock-bar { display: flex; gap: 7px; padding: 12px 14px; border-bottom: 1px solid var(--border); background: var(--bg-soft); }
.mock-bar span { width: 11px; height: 11px; border-radius: 50%; background: var(--border); }
.mock-body { display: grid; grid-template-columns: 340px 1fr; min-height: 340px; }
.mock-list { border-right: 1px solid var(--border); }
.mock-search { margin: 10px; padding: 7px 10px; border: 1px solid var(--border); border-radius: 8px; color: var(--text-muted); }
.mock-row { padding: 10px 14px; border-top: 1px solid var(--border); display: grid; gap: 2px; }
.mock-row.sel { background: var(--accent-soft); }
.mock-row .top { display: flex; justify-content: space-between; gap: 8px; }
.mock-row .from { font-weight: 600; }
.mock-row .time, .mock-row .snip { color: var(--text-muted); }
.mock-row .snip { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.mock-row.dim { opacity: 0.55; }
.chip {
  display: inline-block;
  font-size: 11.5px;
  font-weight: 600;
  padding: 1px 8px;
  border-radius: 999px;
  border: 1px solid currentColor;
  width: fit-content;
}
.chip.reply { color: var(--tag-reply); }
.chip.waiting { color: var(--tag-waiting); }
.chip.fyi { color: var(--tag-fyi); }
.chip.quiet { color: var(--tag-quiet); }
.mock-read { padding: 22px 26px; }
.mock-read h4 { margin: 0 0 6px; font-size: 17px; }
.mock-summary {
  margin: 16px 0;
  padding: 12px 14px;
  border-radius: 10px;
  background: var(--accent-soft);
  border: 1px solid color-mix(in srgb, var(--accent) 25%, transparent);
}
.mock-summary strong { color: var(--accent); font-size: 12px; text-transform: uppercase; letter-spacing: 0.05em; }
.mock-summary p { margin: 4px 0 0; }
.mock-draft { margin-top: 16px; border: 1px dashed var(--border); border-radius: 10px; padding: 12px 14px; color: var(--text-muted); }
.mock-draft b { color: var(--text); }

/* Sections */
section.band { padding: 80px 0; }
section.band.soft { background: var(--bg-soft); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section-head { max-width: 680px; margin: 0 auto 48px; text-align: center; }
.section-head h2 { font-size: clamp(28px, 4vw, 38px); letter-spacing: -0.02em; line-height: 1.15; margin: 0 0 12px; }
.section-head p { color: var(--text-muted); font-size: 18px; margin: 0; }

.grid { display: grid; gap: 20px; grid-template-columns: repeat(3, 1fr); }
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}
.card h3 { margin: 12px 0 6px; font-size: 17px; }
.card p { margin: 0; color: var(--text-muted); font-size: 15px; }
.icon {
  width: 38px;
  height: 38px;
  border-radius: 9px;
  display: grid;
  place-items: center;
  background: var(--accent-soft);
  color: var(--accent);
}
.icon svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }

.modes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.mode { border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; background: var(--bg-card); }
.mode.on { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.mode h3 { margin: 0 0 6px; font-size: 16px; }
.mode p { margin: 0; color: var(--text-muted); font-size: 15px; }
.mode .tagline { font-size: 12px; font-weight: 600; color: var(--accent); text-transform: uppercase; letter-spacing: 0.05em; }

.split { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.split h2 { font-size: clamp(26px, 3.6vw, 34px); letter-spacing: -0.02em; line-height: 1.2; margin: 0 0 14px; }
.split p { color: var(--text-muted); }
.checks { list-style: none; padding: 0; margin: 20px 0 0; display: grid; gap: 10px; }
.checks li { padding-left: 28px; position: relative; }
.checks li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.3em;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent-soft) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M4.5 8.2 7 10.5l4.5-5' fill='none' stroke='%233b5bdb' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/16px no-repeat;
}

.flow { list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; counter-reset: step; }
.flow li {
  counter-increment: step;
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 14px;
  align-items: start;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
}
.flow li::before {
  content: counter(step);
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--accent);
  color: var(--accent-text);
  font-weight: 650;
}
.flow strong { display: block; }
.flow span { color: var(--text-muted); font-size: 15px; }

.providers { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.providers span { border: 1px solid var(--border); border-radius: 999px; padding: 5px 14px; font-size: 14px; background: var(--bg-card); }

.keys-table { width: 100%; border-collapse: collapse; }
.keys-table td { padding: 9px 0; border-bottom: 1px solid var(--border); }
.keys-table td:last-child { text-align: right; white-space: nowrap; }

.cta { text-align: center; padding: 88px 0; }
.cta h2 { font-size: clamp(28px, 4vw, 40px); letter-spacing: -0.02em; margin: 0 0 12px; }
.cta p { color: var(--text-muted); font-size: 18px; margin: 0 0 28px; }

.site-footer { border-top: 1px solid var(--border); padding: 32px 0; color: var(--text-muted); font-size: 14px; }
.site-footer .wrap { display: flex; gap: 20px; flex-wrap: wrap; justify-content: space-between; }
.site-footer nav { display: flex; gap: 18px; }
.site-footer a { color: var(--text-muted); }

/* Docs */
.docs { display: grid; grid-template-columns: 230px minmax(0, 1fr); gap: 48px; padding-top: 40px; padding-bottom: 80px; }
.docs-nav { position: sticky; top: 84px; align-self: start; font-size: 15px; }
.docs-nav h4 { margin: 18px 0 6px; font-size: 12px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-muted); }
.docs-nav h4:first-child { margin-top: 0; }
.docs-nav ul { list-style: none; padding: 0; margin: 0; }
.docs-nav a { display: block; padding: 5px 10px; margin-left: -10px; border-radius: 7px; color: var(--text); }
.docs-nav a:hover { background: var(--bg-soft); text-decoration: none; }
.docs-nav a[aria-current] { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.doc { max-width: 760px; }
.doc h1 { font-size: 36px; letter-spacing: -0.02em; line-height: 1.15; margin: 0 0 10px; }
.doc .lede { font-size: 18px; color: var(--text-muted); margin: 0 0 32px; }
.doc h2 { font-size: 24px; letter-spacing: -0.01em; margin: 44px 0 12px; padding-top: 8px; }
.doc h3 { font-size: 18px; margin: 28px 0 8px; }
.doc table { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 15px; display: block; overflow-x: auto; }
.doc th, .doc td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--border); vertical-align: top; }
.doc th { font-size: 13px; color: var(--text-muted); font-weight: 600; }
.doc li { margin: 4px 0; }
.callout {
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  background: var(--bg-soft);
  border-radius: 8px;
  padding: 12px 16px;
  margin: 20px 0;
}
.callout p { margin: 0; }
.callout.warn { border-left-color: var(--tag-reply); }
.doc-pager { display: flex; justify-content: space-between; gap: 16px; margin-top: 56px; padding-top: 24px; border-top: 1px solid var(--border); }
.doc-pager a { display: grid; overflow-wrap: anywhere; padding: 12px 16px; border: 1px solid var(--border); border-radius: 10px; min-width: 0; }
.doc-pager a:hover { border-color: var(--accent); text-decoration: none; }
.doc-pager small { color: var(--text-muted); }
.doc-pager .next { margin-left: auto; text-align: right; }

@media (max-width: 900px) {
  .grid, .modes { grid-template-columns: 1fr 1fr; }
  .split { grid-template-columns: 1fr; gap: 32px; }
  .mock-body { grid-template-columns: 1fr; }
  .mock-read { display: none; }
  .docs { grid-template-columns: minmax(0, 1fr); gap: 24px; }
  .docs-nav { position: static; border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; }
}
@media (max-width: 620px) {
  .grid, .modes { grid-template-columns: 1fr; }
  .site-header nav a.hide-sm { display: none; }
  .hero { padding-top: 56px; }
  section.band { padding: 56px 0; }
}