/* CHanGE — black & orange, mobile-first. */
:root {
  --bg: #0a0a0b;
  --surface: #141416;
  --surface-2: #1c1c20;
  --line: #2a2a30;
  --text: #f4f4f5;
  --muted: #a1a1aa;
  --orange: #ff6b00;
  --orange-soft: rgba(255, 107, 0, 0.14);
  --radius: 16px;
  --maxw: 880px;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.5;
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}
a { color: inherit; text-decoration: none; }

/* Header */
.app-header {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 28px 20px 8px;
}
.brand { display: flex; align-items: center; gap: 14px; }
.brand-mark {
  flex: none;
  width: 48px; height: 48px;
  border-radius: 12px;
  display: block;
  object-fit: cover;
}
.brand-text h1 {
  margin: 0;
  font-size: 26px;
  letter-spacing: 1px;
  font-weight: 800;
}
.owner { margin: 0; color: var(--muted); font-size: 13px; }
.equation {
  margin: 16px 0 0;
  color: var(--orange);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.3px;
}

/* Sticky pillar nav */
.pillar-nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 12px 20px;
  max-width: var(--maxw);
  margin: 8px auto 0;
  background: rgba(10, 10, 11, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  scrollbar-width: none;
}
.pillar-nav::-webkit-scrollbar { display: none; }
.pill {
  flex: none;
  padding: 7px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  white-space: nowrap;
  transition: all .15s ease;
}
.pill.active, .pill:hover {
  color: #0a0a0b;
  background: var(--orange);
  border-color: var(--orange);
}

/* Layout */
main { max-width: var(--maxw); margin: 0 auto; padding: 8px 20px 40px; }

/* Framework intro */
.intro { margin: 16px 0 8px; }
.intro-card {
  display: block;
  background: linear-gradient(135deg, var(--surface-2), var(--surface));
  border: 1px solid var(--line);
  border-left: 3px solid var(--orange);
  border-radius: var(--radius);
  padding: 20px;
}
.intro-card h2 { margin: 10px 0 6px; font-size: 19px; }
.intro-card p { margin: 0; color: var(--muted); font-size: 14px; }
.intro-open {
  display: inline-block;
  margin-top: 12px;
  color: var(--orange);
  font-weight: 600;
  font-size: 13px;
}

/* Pillar sections */
.pillar { padding-top: 26px; scroll-margin-top: 64px; }
.pillar-head { margin-bottom: 14px; }
.pillar-kicker {
  text-transform: uppercase;
  letter-spacing: 1.5px;
  font-size: 11px;
  font-weight: 700;
  color: var(--orange);
}
.pillar-head h2 { margin: 4px 0 6px; font-size: 23px; }
.pillar-desc { margin: 0; color: var(--muted); font-size: 14px; max-width: 60ch; }

/* Cards */
.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}
.card {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
  transition: transform .12s ease, border-color .12s ease, background .12s ease;
}
.card:not(.card--note):hover {
  transform: translateY(-2px);
  border-color: var(--orange);
  background: var(--surface-2);
}
.card--note { opacity: 0.92; border-style: dashed; }
.card-top { display: flex; align-items: center; justify-content: space-between; }
.card-title { margin: 10px 0 4px; font-size: 16px; }
.card-summary { margin: 0; color: var(--muted); font-size: 13.5px; }
.open { color: var(--orange); font-size: 18px; font-weight: 700; }

/* Type badges */
.badge {
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.6px;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: 6px;
  background: var(--surface-2);
  color: var(--muted);
}
.t-doc { background: var(--orange-soft); color: var(--orange); }
.t-canva { background: rgba(124, 92, 255, 0.16); color: #b3a0ff; }
.t-web { background: rgba(56, 189, 248, 0.16); color: #7dd3fc; }
.t-note { background: var(--surface-2); color: var(--muted); }

/* Footer */
.app-footer {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 24px 20px 40px;
  color: var(--muted);
  font-size: 12px;
  text-align: center;
  border-top: 1px solid var(--line);
}

/* Wider screens (desktop standalone window) */
@media (min-width: 620px) {
  .grid { grid-template-columns: 1fr 1fr; }
  .brand-text h1 { font-size: 30px; }
}
@media (min-width: 860px) {
  .grid { grid-template-columns: 1fr 1fr 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}