/* Pendulum site */
:root {
  --bg: #0a0a0c;
  --bg-1: #111115;
  --bg-2: #17171d;
  --bg-3: #1e1e26;
  --panel: #15151b;
  --stroke: #26262f;
  --stroke-2: #32323d;
  --text: #e8e8ee;
  --text-dim: #a0a0ac;
  --text-mute: #6a6a76;
  --blue: #4aa3ff;
  --blue-dim: #2a6fc4;
  --purple: #c99cff;
  --red: #ff7a8a;
  --green: #7ee4b0;
  --orange: #ffb25e;
  --radius: 10px;
  --radius-sm: 6px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

.mono { font-family: 'JetBrains Mono', ui-monospace, monospace; }

a { color: var(--text); text-decoration: none; }
a:hover { color: var(--blue); }

h1, h2, h3, h4 {
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0;
  text-wrap: balance;
}

h1 { font-size: clamp(44px, 6vw, 88px); line-height: 1.02; letter-spacing: -0.035em; }
h2 { font-size: clamp(28px, 3.2vw, 44px); line-height: 1.1; letter-spacing: -0.025em; }
h3 { font-size: 20px; line-height: 1.3; }

p { margin: 0; color: var(--text-dim); }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
}

/* ───── NAV ───── */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: rgba(10, 10, 12, 0.7);
  border-bottom: 1px solid var(--stroke);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 32px;
  max-width: 1400px;
  margin: 0 auto;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 15px;
  letter-spacing: -0.01em;
}
.logo-mark {
  width: 22px;
  height: 22px;
}
.nav-links {
  display: flex;
  gap: 28px;
  font-size: 13.5px;
  color: var(--text-dim);
}
.nav-links a { color: var(--text-dim); }
.nav-links a:hover { color: var(--text); }
.nav-cta {
  display: flex;
  gap: 8px;
  align-items: center;
}

/* ───── BUTTONS ───── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 18px;
  border-radius: 8px;
  font-size: 13.5px;
  font-weight: 500;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 120ms ease, background 120ms ease, border-color 120ms ease;
  font-family: inherit;
  white-space: nowrap;
}
.btn-primary {
  background: var(--blue);
  color: #0a1628;
  font-weight: 600;
}
.btn-primary:hover { background: #6db6ff; color: #0a1628; transform: translateY(-1px); }
.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--stroke-2);
}
.btn-ghost:hover { background: var(--bg-2); border-color: #42424e; color: var(--text); }
.btn-sm { padding: 7px 13px; font-size: 12.5px; }

/* ───── HERO ───── */
.hero {
  position: relative;
  padding: 96px 0 64px;
  overflow: hidden;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 64px;
  align-items: center;
}
@media (max-width: 960px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-mute);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-family: 'JetBrains Mono', monospace;
  margin-bottom: 24px;
}
.eyebrow::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--blue);
  border-radius: 50%;
  box-shadow: 0 0 12px var(--blue);
}

.hero h1 .accent {
  background: linear-gradient(100deg, #4aa3ff 0%, #7ec4ff 50%, #c99cff 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-sub {
  margin-top: 24px;
  font-size: 18px;
  line-height: 1.55;
  max-width: 520px;
  color: var(--text-dim);
}

.hero-ctas {
  margin-top: 36px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.hero-meta {
  margin-top: 32px;
  display: flex;
  gap: 24px;
  color: var(--text-mute);
  font-size: 12.5px;
  font-family: 'JetBrains Mono', monospace;
}
.hero-meta span { display: flex; align-items: center; gap: 6px; }
.hero-meta span::before {
  content: '';
  width: 4px;
  height: 4px;
  background: var(--text-mute);
  border-radius: 50%;
}

/* ───── CURVE EDITOR ───── */
.curve-editor {
  position: relative;
  background: linear-gradient(180deg, #14141b 0%, #0f0f14 100%);
  border: 1px solid var(--stroke);
  border-radius: 14px;
  padding: 20px;
  box-shadow:
    0 30px 80px -20px rgba(0, 0, 0, 0.6),
    0 0 0 1px rgba(74, 163, 255, 0.04);
}
.curve-editor::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: 14px;
  padding: 1px;
  background: linear-gradient(160deg, rgba(74,163,255,0.3), transparent 40%, transparent 60%, rgba(201,156,255,0.15));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
          mask-composite: exclude;
  pointer-events: none;
}
.ce-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11.5px;
  color: var(--text-mute);
  letter-spacing: 0.03em;
}
.ce-toolbar .title { color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.1em; }
.ce-toolbar .readout { color: var(--blue); }
.canvas-wrap {
  position: relative;
  background: #0a0a10;
  border: 1px solid var(--stroke);
  border-radius: 8px;
  overflow: hidden;
}
.canvas-wrap canvas {
  display: block;
  width: 100%;
  aspect-ratio: 1 / 1;
  cursor: grab;
}
.canvas-wrap.dragging canvas { cursor: grabbing; }

.ce-presets {
  display: flex;
  gap: 8px;
  margin-top: 16px;
  flex-wrap: wrap;
}
.preset {
  background: var(--bg-2);
  border: 1px solid var(--stroke);
  border-radius: 8px;
  padding: 10px 12px 8px;
  cursor: pointer;
  transition: border-color 120ms, background 120ms, transform 120ms;
  min-width: 86px;
  text-align: left;
  font-family: inherit;
  color: var(--text-dim);
}
.preset:hover { border-color: var(--stroke-2); background: var(--bg-3); transform: translateY(-1px); }
.preset.active { border-color: var(--blue); background: rgba(74, 163, 255, 0.08); color: var(--text); }
.preset svg { display: block; width: 48px; height: 28px; margin-bottom: 4px; }
.preset .label { font-size: 11px; font-family: 'JetBrains Mono', monospace; letter-spacing: 0.02em; }
.preset[data-color="purple"].active { border-color: var(--purple); background: rgba(201,156,255,0.08); }
.preset[data-color="red"].active { border-color: var(--red); background: rgba(255,122,138,0.08); }
.preset[data-color="green"].active { border-color: var(--green); background: rgba(126,228,176,0.08); }
.preset[data-color="orange"].active { border-color: var(--orange); background: rgba(255,178,94,0.08); }

/* ───── SECTIONS ───── */
section {
  padding: 96px 0;
  position: relative;
}
.section-head {
  max-width: 640px;
  margin-bottom: 56px;
}
.section-head .eyebrow { margin-bottom: 16px; }
.section-head p {
  margin-top: 16px;
  font-size: 17px;
  color: var(--text-dim);
}

/* ───── FEATURES ───── */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--stroke);
  border: 1px solid var(--stroke);
  border-radius: 12px;
  overflow: hidden;
}
@media (max-width: 800px) {
  .features-grid { grid-template-columns: 1fr; }
}
.feature {
  background: var(--bg-1);
  padding: 32px 28px;
  min-height: 220px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: background 200ms;
}
.feature:hover { background: var(--bg-2); }
.feature .icon {
  width: 36px;
  height: 36px;
  margin-bottom: 16px;
  color: var(--blue);
}
.feature h3 { color: var(--text); }
.feature p { font-size: 14px; line-height: 1.55; }

/* ───── DOCS / GETTING STARTED ───── */
.docs-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 56px;
  align-items: start;
}
@media (max-width: 900px) {
  .docs-layout { grid-template-columns: 1fr; gap: 32px; }
}
.docs-nav {
  position: sticky;
  top: 80px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-size: 13.5px;
}
.docs-nav .group {
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 11px;
  color: var(--text-mute);
  margin: 16px 0 6px;
  font-family: 'JetBrains Mono', monospace;
}
.docs-nav .group:first-child { margin-top: 0; }
.docs-nav a {
  color: var(--text-dim);
  padding: 6px 10px;
  border-radius: 6px;
  border-left: 2px solid transparent;
  margin-left: -2px;
}
.docs-nav a:hover { color: var(--text); background: var(--bg-1); }
.docs-nav a.active { color: var(--blue); border-left-color: var(--blue); }

.docs-content .doc-block {
  margin-bottom: 56px;
}
.docs-content h2 {
  margin-bottom: 12px;
}
.docs-content h3 {
  margin-top: 32px;
  margin-bottom: 10px;
}
.docs-content p { margin-bottom: 12px; line-height: 1.65; }
.docs-content ol, .docs-content ul {
  color: var(--text-dim);
  padding-left: 20px;
  line-height: 1.75;
}
.docs-content li { margin-bottom: 6px; }
.docs-content li strong { color: var(--text); font-weight: 600; }

.kbd {
  display: inline-block;
  background: var(--bg-2);
  border: 1px solid var(--stroke-2);
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 1px 6px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--text);
}

code.inline {
  background: var(--bg-2);
  border: 1px solid var(--stroke);
  border-radius: 4px;
  padding: 1px 6px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12.5px;
  color: var(--blue);
}

.callout {
  border-left: 2px solid var(--blue);
  background: rgba(74, 163, 255, 0.05);
  padding: 14px 18px;
  border-radius: 0 8px 8px 0;
  margin: 16px 0;
  font-size: 14px;
  color: var(--text-dim);
}

/* ───── CHANGELOG ───── */
.changelog-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--stroke);
}
.release {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 32px;
  padding: 32px 0;
  border-bottom: 1px solid var(--stroke);
}
@media (max-width: 700px) {
  .release { grid-template-columns: 1fr; gap: 12px; }
}
.release-meta { display: flex; flex-direction: column; gap: 8px; }
.version-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  background: var(--bg-2);
  border: 1px solid var(--stroke-2);
  color: var(--text);
  padding: 4px 10px;
  border-radius: 999px;
  width: fit-content;
}
.version-badge.latest { border-color: var(--blue); color: var(--blue); background: rgba(74,163,255,0.06); }
.release-date { font-family: 'JetBrains Mono', monospace; font-size: 12px; color: var(--text-mute); }
.release h3 { margin-bottom: 12px; }
.change-tag {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 10.5px;
  padding: 2px 8px;
  border-radius: 4px;
  margin-right: 8px;
  vertical-align: middle;
  letter-spacing: 0.04em;
}
.change-tag.added { background: rgba(126,228,176,0.1); color: var(--green); }
.change-tag.fixed { background: rgba(255,178,94,0.1); color: var(--orange); }
.change-tag.changed { background: rgba(74,163,255,0.1); color: var(--blue); }
.change-tag.removed { background: rgba(255,122,138,0.1); color: var(--red); }
.release ul { margin: 0; padding-left: 0; list-style: none; }
.release ul li { padding: 6px 0; color: var(--text-dim); font-size: 14.5px; }

/* ───── FAQ ───── */
.faq-list { display: flex; flex-direction: column; gap: 0; border-top: 1px solid var(--stroke); }
.faq {
  border-bottom: 1px solid var(--stroke);
  padding: 0;
}
.faq summary {
  padding: 24px 0;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  list-style: none;
  font-weight: 500;
  font-size: 16px;
  color: var(--text);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: '+';
  font-family: 'JetBrains Mono', monospace;
  font-size: 20px;
  color: var(--text-mute);
  transition: transform 200ms;
}
.faq[open] summary::after { transform: rotate(45deg); color: var(--blue); }
.faq-body {
  padding-bottom: 24px;
  color: var(--text-dim);
  font-size: 15px;
  line-height: 1.65;
  max-width: 760px;
}

/* ───── INSTALL ───── */
.install-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
@media (max-width: 760px) {
  .install-grid { grid-template-columns: 1fr; }
}
.install-card {
  background: var(--bg-1);
  border: 1px solid var(--stroke);
  border-radius: 12px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: border-color 200ms, transform 200ms;
}
.install-card:hover { border-color: var(--stroke-2); transform: translateY(-2px); }
.install-card .num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--text-mute);
  letter-spacing: 0.1em;
}
.install-card h3 { margin-bottom: 4px; }
.install-card p { font-size: 14px; color: var(--text-dim); flex: 1; }
.install-card .btn { align-self: flex-start; margin-top: 8px; }

/* ───── FOOTER ───── */
footer {
  border-top: 1px solid var(--stroke);
  padding: 48px 0 64px;
  margin-top: 48px;
}
.footer-grid {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 24px;
  color: var(--text-mute);
  font-size: 13px;
}
.footer-grid .mono { font-size: 12px; }
.footer-links { display: flex; gap: 24px; }
.footer-links a { color: var(--text-mute); }

/* ───── ANIMATED BG ───── */
.bg-grid {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(74, 163, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(74, 163, 255, 0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at 60% 40%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at 60% 40%, #000 30%, transparent 75%);
}
.bg-glow {
  position: absolute;
  width: 700px;
  height: 700px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(74,163,255,0.15), transparent 60%);
  top: -200px;
  right: -200px;
  pointer-events: none;
  filter: blur(40px);
}
.bg-glow.purple {
  background: radial-gradient(circle, rgba(201,156,255,0.08), transparent 60%);
  top: 40%;
  left: -300px;
  right: auto;
}

/* ───── section separators ───── */
.divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--stroke), transparent);
  margin: 0 auto;
  max-width: 1200px;
}

/* Reveal on scroll — progressive enhancement: visible by default, animated only when JS flags it */
.reveal { opacity: 1; transform: none; }
.js-reveal .reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 600ms ease, transform 600ms ease;
}
.js-reveal .reveal.in { opacity: 1; transform: translateY(0); }

/* ───── CURVE EDITOR CHROME ───── */
#curveReadout {
  background: none;
  border: none;
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 4px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11.5px;
  color: var(--blue);
  letter-spacing: 0.03em;
  transition: background 120ms, color 120ms;
}
#curveReadout:hover {
  background: var(--bg-2);
  color: var(--text);
}
#curveReadout.copied {
  color: var(--green);
}

.canvas-wrap.dragging canvas {
  cursor: grabbing;
}