/* chetanbatra.com — design tokens */

:root {
  /* Type */
  --font-sans: 'Geist', ui-sans-serif, system-ui, sans-serif;
  --font-mono: 'Geist Mono', ui-monospace, 'SF Mono', Menlo, monospace;
  --font-serif: 'Instrument Serif', 'Iowan Old Style', Georgia, serif;

  /* Dark palette (default) */
  --bg: oklch(0.155 0.006 60);
  --bg-elev: oklch(0.195 0.007 60);
  --bg-card: oklch(0.215 0.008 60);
  --fg: oklch(0.965 0.005 80);
  --fg-2: oklch(0.78 0.008 70);
  --fg-3: oklch(0.58 0.008 70);
  --fg-4: oklch(0.42 0.008 70);
  --border: oklch(0.30 0.008 70);
  --border-soft: oklch(0.25 0.008 70 / 0.7);

  --accent: oklch(0.78 0.16 38);   /* coral */
  --accent-soft: oklch(0.78 0.16 38 / 0.16);
  --accent-line: oklch(0.78 0.16 38 / 0.4);
  --term: oklch(0.84 0.18 145);    /* terminal green */
  --term-soft: oklch(0.84 0.18 145 / 0.16);

  /* Glow tokens */
  --accent-glow: 0 12px 32px var(--accent-soft);
  --lilac-glow: 0 12px 32px rgba(183, 156, 255, 0.18);
  --sky-glow: 0 12px 32px rgba(124, 192, 255, 0.18);
  --mint-glow: 0 12px 32px rgba(110, 231, 183, 0.18);

  /* Density */
  --section-pad-y: 120px;
  --container: 1180px;
  --gutter: 32px;

  /* Radii */
  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 16px;
  --r-xl: 22px;

  color-scheme: dark;
}

[data-theme="light"] {
  --bg: oklch(0.985 0.004 80);
  --bg-elev: oklch(0.975 0.004 80);
  --bg-card: oklch(0.965 0.005 80);
  --fg: oklch(0.18 0.006 60);
  --fg-2: oklch(0.32 0.008 70);
  --fg-3: oklch(0.50 0.008 70);
  --fg-4: oklch(0.65 0.008 70);
  --border: oklch(0.85 0.008 70);
  --border-soft: oklch(0.88 0.008 70 / 0.8);
  --accent-soft: oklch(0.78 0.16 38 / 0.18);
  --term-soft: oklch(0.84 0.18 145 / 0.22);
  color-scheme: light;
}

[data-density="compact"] {
  --section-pad-y: 88px;
}
[data-density="spacious"] {
  --section-pad-y: 160px;
}

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

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-feature-settings: 'ss01', 'cv11';
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-size: 16px;
  line-height: 1.55;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; }

::selection { background: var(--accent-soft); color: var(--fg); }

/* Layout */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}
.section {
  padding: var(--section-pad-y) 0;
  position: relative;
}

/* Subtle grain overlay */
.grain::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  opacity: 0.035;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='200' height='200'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
}

/* Type system */
h1, h2, h3, h4 { margin: 0; font-weight: 500; letter-spacing: -0.02em; line-height: 1.05; }
h1 { font-size: clamp(48px, 7.2vw, 104px); letter-spacing: -0.035em; }
h2 { font-size: clamp(32px, 4vw, 56px); letter-spacing: -0.028em; }
h3 { font-size: clamp(20px, 2vw, 28px); letter-spacing: -0.02em; }
p { margin: 0; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-3);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.eyebrow::before {
  content: '';
  width: 18px;
  height: 1px;
  background: var(--fg-4);
}

.mono { font-family: var(--font-mono); font-feature-settings: 'ss02', 'zero'; }
.serif { font-family: var(--font-serif); font-style: italic; font-weight: 400; }

/* Nav */
.nav {
  position: fixed;
  top: 16px; left: 50%;
  transform: translateX(-50%);
  z-index: 50;
  display: flex; align-items: center; gap: 4px;
  padding: 6px;
  background: oklch(from var(--bg-elev) l c h / 0.72);
  -webkit-backdrop-filter: blur(20px) saturate(150%);
  backdrop-filter: blur(20px) saturate(150%);
  border: 0.5px solid var(--border-soft);
  border-radius: 999px;
  box-shadow: 0 8px 32px rgba(0,0,0,.18), inset 0 0.5px 0 oklch(1 0 0 / .06);
  font-size: 13px;
}
.nav a {
  padding: 8px 14px;
  border-radius: 999px;
  color: var(--fg-2);
  transition: background .15s, color .15s;
  font-weight: 500;
}
.nav a:hover { background: oklch(from var(--fg) l c h / .06); color: var(--fg); }
.nav .nav-brand {
  padding: 8px 12px 8px 8px;
  display: inline-flex; align-items: center; gap: 8px;
  color: var(--fg);
  font-weight: 600;
  letter-spacing: -0.01em;
}
.nav .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--term);
  box-shadow: 0 0 0 3px var(--term-soft);
  animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 3px var(--term-soft); }
  50% { box-shadow: 0 0 0 6px oklch(from var(--term) l c h / 0.05); }
}

/* Buttons / chips */
.chip {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 12px;
  border: 0.5px solid var(--border);
  border-radius: 999px;
  background: var(--bg-elev);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--fg-2);
}
.chip .led {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--term);
  box-shadow: 0 0 8px var(--term);
}

/* Cards */
.card {
  background: var(--bg-card);
  border: 0.5px solid var(--border);
  border-radius: var(--r-lg);
  padding: 28px;
  position: relative;
}

/* Reveal-on-scroll */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .9s cubic-bezier(.2,.7,.2,1), transform .9s cubic-bezier(.2,.7,.2,1);
}
.reveal.in {
  opacity: 1;
  transform: none;
}

/* Staggered hero entrance */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: none; }
}
.hero-anim {
  opacity: 0;
  animation: fadeUp .8s cubic-bezier(.2,.7,.2,1) forwards;
}
.hero-anim-1 { animation-delay: .05s; }
.hero-anim-2 { animation-delay: .18s; }
.hero-anim-3 { animation-delay: .32s; }
.hero-anim-4 { animation-delay: .48s; }
.hero-anim-5 { animation-delay: .65s; }
.hero-anim-6 { animation-delay: .85s; }

/* Scroll progress + nav sliding indicator */
.scroll-progress {
  position: fixed; top: 0; left: 0; right: 0;
  height: 2px;
  z-index: 60;
  background: var(--accent);
  transform-origin: left;
  transform: scaleX(var(--scroll-progress, 0));
  transition: transform .12s linear;
  pointer-events: none;
  opacity: 0.85;
}
.nav-indicator {
  position: absolute;
  top: 6px;
  height: calc(100% - 12px);
  background: var(--accent-soft);
  border-radius: 999px;
  transition: left .35s cubic-bezier(.4,.7,.2,1), width .35s cubic-bezier(.4,.7,.2,1), opacity .25s;
  pointer-events: none;
  z-index: 0;
}
.nav .nav-brand, .nav a { position: relative; z-index: 1; }
.nav a.on { background: transparent; color: var(--accent); }
.nav a.on:hover { background: transparent; }

/* Floating orbs */
@keyframes orb-drift-a {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(40px, -30px); }
}
@keyframes orb-drift-b {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(-50px, 40px); }
}

/* Bouncing dots */
@keyframes dot-bounce {
  0%, 80%, 100% { transform: translateY(0); opacity: 0.4; }
  40% { transform: translateY(-4px); opacity: 1; }
}

/* Section header common */
.sec-head {
  display: flex; align-items: flex-end; justify-content: space-between;
  gap: 32px; margin-bottom: 56px; flex-wrap: wrap;
}
.sec-head .meta {
  display: flex; flex-direction: column; gap: 16px; max-width: 560px;
}
.sec-head .num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--fg-4);
  letter-spacing: 0.06em;
}

/* Footer */
footer { border-top: 0.5px solid var(--border); }

/* Utility */
.divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border) 20%, var(--border) 80%, transparent);
  margin: 0 auto;
}

/* Selection rings */
.glow-ring {
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  pointer-events: none;
  background: radial-gradient(120% 80% at 50% 0%, var(--accent-soft), transparent 60%);
  opacity: 0;
  transition: opacity .3s;
}
.card:hover .glow-ring { opacity: 1; }

/* Marquee for tools */
.marquee {
  display: flex;
  gap: 56px;
  white-space: nowrap;
  animation: scroll-x 32s linear infinite;
}
@keyframes scroll-x {
  to { transform: translateX(-50%); }
}
.marquee-mask {
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
  overflow: hidden;
}