/* Doublebook marketing site */
:root {
  color-scheme: light dark;
  --fg: #0e0e10;
  --bg: #fafafa;
  --bg-soft: #f1f1f3;
  --muted: #5b5b62;
  --accent: #2256dd;
  --accent-fg: #ffffff;
  --border: #e5e5e9;
  --shadow: 0 1px 0 rgba(0,0,0,0.04), 0 8px 24px rgba(0,0,0,0.06);
  --radius: 10px;
  --radius-lg: 14px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --fg: #ececf0;
    --bg: #0c0c10;
    --bg-soft: #16161c;
    --muted: #9999a3;
    --accent: #88aaff;
    --accent-fg: #0c0c10;
    --border: #25252e;
    --shadow: 0 1px 0 rgba(0,0,0,0.4), 0 8px 24px rgba(0,0,0,0.4);
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", system-ui, sans-serif;
  font-size: 17px;
  line-height: 1.55;
  color: var(--fg);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code, pre {
  font-family: ui-monospace, "JetBrains Mono", "SF Mono", Menlo, monospace;
  font-size: 0.9em;
}
pre {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.8rem 1rem;
  overflow-x: auto;
}
code:not(pre code) {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.05rem 0.35rem;
}

.container { max-width: 920px; margin: 0 auto; padding: 0 1.25rem; }

/* Header */
header {
  padding: 1.4rem 0;
  border-bottom: 1px solid transparent;
}
header .container {
  display: flex; align-items: center; gap: 1rem;
}
.logo {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-weight: 600; font-size: 1.05rem; letter-spacing: -0.01em;
  color: var(--fg); text-decoration: none;
}
.logo svg { width: 26px; height: 26px; }
nav.top { margin-left: auto; display: flex; gap: 0.4rem; align-items: center; }
nav.top a {
  color: var(--fg); padding: 0.45rem 0.8rem; border-radius: 8px;
  text-decoration: none; font-size: 0.95rem;
}
nav.top a:hover { background: var(--bg-soft); }

/* Buttons */
.btn {
  display: inline-block; padding: 0.6rem 1.05rem;
  border-radius: 9px; font-weight: 500; font-size: 0.98rem;
  border: 1px solid var(--border); color: var(--fg); background: transparent;
  text-decoration: none; transition: transform 0.05s ease, background 0.15s ease;
}
.btn:hover { background: var(--bg-soft); text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn.primary { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); }
.btn.primary:hover { filter: brightness(1.06); background: var(--accent); }

/* Hero */
.hero { padding: 4.5rem 0 3rem; }
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0 0 0.8rem;
  font-weight: 700;
}
.hero .lede {
  font-size: 1.2rem; color: var(--muted);
  max-width: 36ch; margin: 0 0 1.6rem;
}
.hero .cta { display: flex; gap: 0.6rem; flex-wrap: wrap; }
.hero .meta { margin-top: 1.1rem; color: var(--muted); font-size: 0.9rem; }

/* Two-card visual */
.split {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1rem;
  margin: 2.5rem 0 0;
}
@media (max-width: 640px) { .split { grid-template-columns: 1fr; } }
.card {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--bg-soft);
  box-shadow: var(--shadow);
  padding: 1.2rem 1.25rem 1.4rem;
}
.card h3 {
  margin: 0 0 0.2rem; font-size: 0.95rem; font-weight: 600;
  letter-spacing: 0.02em; text-transform: uppercase; color: var(--muted);
}
.card .who { font-size: 0.85rem; color: var(--muted); margin-bottom: 0.8rem; }
.event {
  display: grid; grid-template-columns: 4.4rem 1fr;
  gap: 0.8rem; padding: 0.55rem 0; border-top: 1px solid var(--border);
}
.event:first-of-type { border-top: 0; }
.event .time { color: var(--muted); font-family: ui-monospace, monospace; font-size: 0.8rem; padding-top: 0.15rem; }
.event .what strong { font-weight: 500; }
.event .what .where { color: var(--muted); font-size: 0.85rem; }
.event.busy .what strong { color: var(--muted); }
.event.busy .what::before { content: "■"; color: var(--accent); margin-right: 0.45rem; opacity: 0.7; }

/* Sections */
section { padding: 3.5rem 0; }
section.alt { background: var(--bg-soft); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
section h2 {
  font-size: clamp(1.4rem, 3vw, 2rem);
  margin: 0 0 0.4rem;
  letter-spacing: -0.015em;
}
section .sub { color: var(--muted); margin: 0 0 2rem; max-width: 60ch; }

/* Feature grid */
.features {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem;
}
@media (max-width: 800px) { .features { grid-template-columns: 1fr; } }
.feature {
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.1rem 1.2rem; background: var(--bg);
}
.feature h3 { margin: 0 0 0.4rem; font-size: 1.02rem; }
.feature p { margin: 0; color: var(--muted); font-size: 0.95rem; }

/* How it works */
.steps { counter-reset: step; display: grid; gap: 0.8rem; }
.step {
  display: grid; grid-template-columns: 2.4rem 1fr; gap: 0.8rem;
  padding: 0.9rem 1rem; border: 1px solid var(--border);
  border-radius: var(--radius); background: var(--bg);
}
.step::before {
  counter-increment: step; content: counter(step);
  font-weight: 600; font-size: 1.1rem; color: var(--accent);
  display: flex; align-items: center; justify-content: center;
}
.step h3 { margin: 0 0 0.15rem; font-size: 1rem; }
.step p { margin: 0; color: var(--muted); font-size: 0.93rem; }

/* FAQ */
details {
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 0.7rem 1rem; margin-bottom: 0.5rem; background: var(--bg);
}
details[open] { background: var(--bg-soft); }
summary { cursor: pointer; font-weight: 500; padding: 0.2rem 0; }
details p { margin: 0.6rem 0 0.2rem; color: var(--muted); }

/* Footer */
footer {
  padding: 2.5rem 0 3rem; border-top: 1px solid var(--border);
  color: var(--muted); font-size: 0.9rem;
}
footer .container { display: flex; flex-wrap: wrap; gap: 1rem; align-items: center; }
footer nav { margin-left: auto; display: flex; gap: 1rem; }
footer a { color: var(--muted); }

/* Pages */
.prose { padding: 2.5rem 0 4rem; max-width: 70ch; }
.prose h1 { font-size: 2rem; margin: 0 0 0.4rem; letter-spacing: -0.015em; }
.prose .updated { color: var(--muted); margin: 0 0 1.6rem; }
.prose h2 { margin-top: 2rem; font-size: 1.2rem; }
.prose ul { padding-left: 1.2rem; }
.prose li { margin: 0.2rem 0; }