/* ============================================================
   fronte.io /ideas — the idea-paper library
   Shares the studio palette; tuned for long-form reading.
   Self-contained. No frameworks, no build tools.
   ============================================================ */

:root {
  --bg: #07070d;
  --bg-soft: #0c0c16;
  --ink: #f2f3fa;
  --ink-dim: #9aa0b5;
  --ink-faint: #666c82;
  --line: rgba(255, 255, 255, 0.08);
  --glass: rgba(255, 255, 255, 0.035);
  --glass-strong: rgba(255, 255, 255, 0.06);
  --violet: #8b5cf6;
  --fuchsia: #d946ef;
  --amber: #f59e0b;
  --cyan: #22d3ee;
  --green: #34d399;
  --rose: #fb7185;
  --blue: #60a5fa;
  --grad-main: linear-gradient(100deg, #a78bfa 0%, #e879f9 45%, #fbbf24 100%);
  --radius: 18px;
  --font-display: "Space Grotesk", "Inter", system-ui, sans-serif;
  --font-body: "Inter", system-ui, -apple-system, sans-serif;
  --maxw: 1120px;
  --readw: 44rem;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
.wrap { width: min(var(--maxw), 92vw); margin-inline: auto; }
.grad { background: var(--grad-main); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* ---------------- Ambient background ---------------- */
.bg { position: fixed; inset: 0; z-index: -2; overflow: hidden; }
.bg-orbs { position: absolute; inset: 0; }
.orb { position: absolute; border-radius: 50%; filter: blur(90px); opacity: 0.5; animation: drift 26s ease-in-out infinite alternate; }
.orb-1 { width: 560px; height: 560px; top: -180px; left: -120px; background: radial-gradient(circle, rgba(139,92,246,0.55), transparent 70%); }
.orb-2 { width: 480px; height: 480px; top: 8%; right: -160px; background: radial-gradient(circle, rgba(217,70,239,0.4), transparent 70%); animation-delay: -8s; }
.orb-3 { width: 620px; height: 620px; bottom: -260px; left: 30%; background: radial-gradient(circle, rgba(245,158,11,0.22), transparent 70%); animation-delay: -16s; }
@keyframes drift { from { transform: translate3d(0,0,0) scale(1); } to { transform: translate3d(40px,30px,0) scale(1.12); } }
.bg-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.035) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, black 30%, transparent 75%);
}
.bg-fade { position: absolute; inset: 0; background: linear-gradient(180deg, transparent 40%, var(--bg) 96%); }

/* ---------------- Nav ---------------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  background: rgba(7,7,13,0.55); border-bottom: 1px solid var(--line);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { display: inline-flex; align-items: center; gap: 8px; font-family: var(--font-display); font-weight: 700; letter-spacing: -0.02em; }
.logo-mark { color: var(--fuchsia); }
.logo-io { color: var(--ink-faint); }
.nav-links { display: flex; align-items: center; gap: 22px; font-size: 0.92rem; color: var(--ink-dim); }
.nav-links a:hover { color: var(--ink); }
.nav-cta { color: var(--ink); border: 1px solid var(--line); padding: 8px 14px; border-radius: 999px; background: var(--glass); }
.nav-cta:hover { background: var(--glass-strong); }

/* ---------------- Hub ---------------- */
.hub-hero { padding: 84px 0 24px; }
.kicker {
  font-family: var(--font-display); font-size: 0.78rem; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--amber); margin-bottom: 14px;
}
.hub-title { font-family: var(--font-display); font-weight: 700; letter-spacing: -0.03em; font-size: clamp(2.2rem, 5vw, 3.4rem); line-height: 1.05; }
.hub-dek { margin-top: 18px; max-width: 42rem; color: var(--ink-dim); font-size: 1.08rem; }
.hub-note { margin-top: 14px; max-width: 42rem; color: var(--ink-faint); font-size: 0.92rem; }

.hub-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 18px; padding: 34px 0 96px;
}
.card {
  position: relative; display: flex; flex-direction: column; gap: 12px;
  padding: 24px; border-radius: var(--radius);
  background: var(--glass); border: 1px solid var(--line);
  transition: transform .25s ease, border-color .25s ease, background .25s ease;
}
.card:hover { transform: translateY(-4px); border-color: rgba(255,255,255,0.18); background: var(--glass-strong); }
.card-top { display: flex; align-items: center; justify-content: space-between; }
.card-icon { font-size: 1.5rem; }
.card-kind { font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-faint); }
.card-name { font-family: var(--font-display); font-size: 1.28rem; letter-spacing: -0.02em; line-height: 1.2; }
.card-dek { color: var(--ink-dim); font-size: 0.98rem; flex: 1; }
.card-more { color: var(--amber); font-size: 0.9rem; font-weight: 500; }
.accent-violet { box-shadow: inset 0 2px 0 0 var(--violet); }
.accent-rose { box-shadow: inset 0 2px 0 0 var(--rose); }
.accent-blue { box-shadow: inset 0 2px 0 0 var(--blue); }
.accent-green { box-shadow: inset 0 2px 0 0 var(--green); }
.accent-amber { box-shadow: inset 0 2px 0 0 var(--amber); }
.accent-cyan { box-shadow: inset 0 2px 0 0 var(--cyan); }
.accent-fuchsia { box-shadow: inset 0 2px 0 0 var(--fuchsia); }

/* ---------------- Article ---------------- */
.paper { width: min(var(--readw), 92vw); margin-inline: auto; padding: 56px 0 96px; }
.back { display: inline-block; color: var(--ink-faint); font-size: 0.9rem; margin-bottom: 30px; }
.back:hover { color: var(--ink); }
.paper-title {
  font-family: var(--font-display); font-weight: 700; letter-spacing: -0.03em;
  font-size: clamp(1.9rem, 4.4vw, 3rem); line-height: 1.08; margin-top: 8px;
}
.paper-dek { margin-top: 18px; font-size: 1.15rem; color: var(--ink-dim); }
.paper-meta { margin-top: 20px; padding-bottom: 26px; border-bottom: 1px solid var(--line); color: var(--ink-faint); font-size: 0.85rem; letter-spacing: 0.02em; }

.prose { margin-top: 30px; font-size: 1.08rem; }
.prose p { margin: 0 0 1.15em; }
.prose h2 { font-family: var(--font-display); font-size: 1.5rem; letter-spacing: -0.02em; margin: 1.7em 0 0.5em; }
.prose h3 { font-family: var(--font-display); font-size: 1.2rem; margin: 1.4em 0 0.4em; }
.prose ul, .prose ol { margin: 0 0 1.15em 1.3em; }
.prose li { margin: 0.35em 0; }
.prose blockquote { border-left: 3px solid var(--violet); padding: 0.2em 0 0.2em 1em; color: var(--ink-dim); margin: 0 0 1.15em; font-style: italic; }
.prose a { color: var(--cyan); border-bottom: 1px solid rgba(34,211,238,0.35); }
.prose a:hover { border-bottom-color: var(--cyan); }
.prose strong { color: #fff; font-weight: 600; }
.prose code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.9em; background: var(--glass-strong); border: 1px solid var(--line); border-radius: 6px; padding: 1px 6px; }
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 2em 0; }

.paper-foot { margin-top: 46px; padding-top: 24px; border-top: 1px solid var(--line); color: var(--ink-faint); font-size: 0.9rem; display: flex; flex-wrap: wrap; gap: 10px 20px; justify-content: space-between; }
.paper-foot a { color: var(--ink-dim); }
.paper-foot a:hover { color: var(--ink); }

@media (max-width: 640px) {
  .nav-links a:not(.nav-cta) { display: none; }
  .hub-hero { padding-top: 56px; }
}