/* ===========================
   The Symbiosis Manifesto — styles
   Calm, warm, accessible; mobile-first; dark-mode aware
   =========================== */

:root {
  --bg: #0e0f11;
  --panel: #14161a;
  --text: #f5f7fa;
  --muted: #b7c2cf;
  --primary: #7bd1b8;  /* warm green-teal */
  --primary-ink: #0b3b33;
  --accent: #f0c27b;  /* soft gold for highlights */
  --border: #24272d;
  --shadow: 0 10px 30px rgba(0,0,0,.25);
  --radius: 16px;
  --space: 18px;
  --max: 1080px;
  --focus: 0 0 0 3px rgba(123, 209, 184, .55);
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f7fafb;
    --panel: #ffffff;
    --text: #0e141b;
    --muted: #536273;
    --border: #e7ecf2;
    --shadow: 0 10px 30px rgba(6,18,38,.06);
    --primary-ink: #052c25;
  }
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: radial-gradient(1200px 600px at 20% -10%, rgba(123,209,184,.10), transparent 60%),
              radial-gradient(1000px 600px at 90% 10%, rgba(240,194,123,.08), transparent 60%),
              var(--bg);
  color: var(--text);
  font: 16px/1.55 system-ui, -apple-system, Segoe UI, Roboto, Inter, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji";
  text-rendering: optimizeLegibility;
}

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 40;
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; padding: 12px 16px;
  background: rgba(20,22,26,.7); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
@media (prefers-color-scheme: light) {
  .site-header { background: rgba(255,255,255,.7); }
}
.brand { display: inline-flex; align-items: center; gap: 10px; }
.brand .dot { width: 10px; height: 10px; border-radius: 50%; background: var(--primary); box-shadow: 0 0 0 6px rgba(123,209,184,.25); }
.brand-name { text-decoration: none; color: var(--text); font-weight: 600; letter-spacing: .2px; }

.top-nav a {
  color: var(--muted); text-decoration: none; margin-left: 14px; font-weight: 500;
}
.top-nav a:hover { color: var(--text); }
.top-nav .cta {
  margin-left: 16px; padding: 8px 14px; border-radius: 999px; background: var(--primary); color: var(--primary-ink); font-weight: 700;
}

/* Hero */
.hero { display: grid; place-items: center; padding: 64px 16px 48px; }
.hero-card {
  width: 100%; max-width: var(--max); background: linear-gradient(180deg, rgba(255,255,255,.03), transparent 40%), var(--panel);
  border: 1px solid var(--border); border-radius: calc(var(--radius) + 6px);
  padding: clamp(20px, 4vw, 36px);
  box-shadow: var(--shadow);
}
.hero-card h1 { font-size: clamp(28px, 4.6vw, 48px); margin: 0 0 10px; letter-spacing: .2px; }
.lead { font-size: 1.125rem; color: var(--muted); margin: 0 0 18px; }
.hero-actions { display: inline-flex; gap: 10px; flex-wrap: wrap; margin-bottom: 8px; }

.btn {
  display: inline-block; border: 1px solid var(--border); background: var(--panel);
  color: var(--text); padding: 10px 14px; border-radius: 999px; text-decoration: none; font-weight: 600;
}
.btn.primary { background: var(--primary); color: var(--primary-ink); border-color: transparent; }
.btn.ghost { background: transparent; }
.btn:focus-visible { outline: none; box-shadow: var(--focus); }

/* Sections */
.section { padding: 42px 16px; }
.section-header { max-width: var(--max); margin: 0 auto 16px; }
.section-header h2 { margin: 0 0 6px; font-size: clamp(22px, 3.4vw, 32px); }
.muted { color: var(--muted); }
.subtle { color: var(--muted); font-size: .9rem; }

/* Timeline */
.timeline { max-width: var(--max); margin: 16px auto 0; display: grid; gap: 16px; }
.time-card {
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px 18px; box-shadow: var(--shadow);
}
.time-card h3 { margin: 0 0 6px; font-size: 1.05rem; }

/* Quote */
.pull-quote {
  max-width: var(--max); margin: 22px auto 0; padding: 18px 20px;
  border-left: 4px solid var(--accent); background: color-mix(in oklab, var(--panel) 88%, var(--accent) 12%);
  border-radius: var(--radius);
}
.pull-quote p { margin: 0; }
.pull-quote footer { margin-top: 10px; color: var(--muted); font-size: .95rem; }

/* Grid + Cards */
.grid { max-width: var(--max); margin: 8px auto 0; display: grid; gap: 16px; }
.grid.two { grid-template-columns: 1fr; }
@media (min-width: 860px) { .grid.two { grid-template-columns: 1fr 1fr; } }

.card {
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px 18px; box-shadow: var(--shadow);
}
.card h3 { margin: 0 0 8px; }
.card .note { color: var(--muted); }

/* Diagram */
.diagram { display: grid; grid-auto-flow: column; grid-auto-columns: 1fr; align-items: center; gap: 10px; overflow-x: auto; }
.diagram .pill {
  padding: 10px 12px; background: color-mix(in oklab, var(--panel) 75%, var(--primary) 25%);
  color: var(--primary-ink); border-radius: 999px; white-space: nowrap; font-weight: 700; border: 1px solid color-mix(in oklab, var(--border) 70%, var(--primary) 30%);
}
.diagram .arrow { text-align: center; color: var(--muted); font-weight: 800; }

/* Lists */
.checklist { padding-left: 18px; margin: 8px 0; }
.checklist li { margin: 6px 0; }
.numbered { padding-left: 18px; margin: 8px 0; }
.numbered li { margin: 8px 0; }

/* Details */
.expando { max-width: var(--max); margin: 14px auto 0; }
.expando summary { cursor: pointer; font-weight: 600; }
.expando[open] summary { color: var(--primary); }

/* Footer */
.site-footer {
  margin-top: 24px; padding: 24px 16px; border-top: 1px solid var(--border);
  display: grid; gap: 8px; place-items: center; color: var(--muted);
}
.foot-links a { color: var(--muted); text-decoration: none; margin: 0 8px; }
.foot-links a:hover { color: var(--text); }

/* Helpers */
.center { text-align: center; }
.stack { display: grid; gap: 10px; }
.tiny { font-size: .85rem; color: var(--muted); }

/* Focus visible */
a:focus-visible, button:focus-visible, summary:focus-visible { outline: none; box-shadow: var(--focus); border-radius: 8px; }

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; }
}