/* ============================================================
   EXCELSIOR WEB DESIGN — SHARED DESIGN SYSTEM
   Liquid-glass, cinematic-dark, editorial-serif
   ============================================================ */

:root {
  /* ---- Palette (monochrome + warm off-whites) ---- */
  --ink-000: #060607;
  --ink-050: #0b0b0d;
  --ink-100: #111114;
  --ink-200: #16171a;
  --ink-300: #1f2024;
  --ink-400: #2a2c31;
  --ink-500: #3a3d44;
  --ink-600: #5c616b;
  --ink-700: #8a909c;
  --ink-800: #b6bac3;
  --ink-900: #e7e6e1;   /* warm off-white */
  --ink-950: #f5f2ec;   /* paper */

  --accent: var(--ink-950);     /* monochrome — accent is light-on-dark */
  --accent-soft: rgba(245,242,236,.72);

  /* ---- Glass ---- */
  --glass-bg: rgba(255,255,255,0.055);
  --glass-bg-strong: rgba(255,255,255,0.09);
  --glass-border: rgba(255,255,255,0.14);
  --glass-border-strong: rgba(255,255,255,0.22);
  --glass-blur: 28px;
  --glass-sat: 140%;

  /* ---- Type ---- */
  --font-display: "Cormorant Garamond", "Cormorant", Georgia, serif;
  --font-sans: "Inter Tight", "Inter", ui-sans-serif, system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --tracking-tight: -0.022em;
  --tracking-snug: -0.012em;
  --tracking-wide: 0.18em;
  --tracking-ultra: 0.32em;

  /* ---- Scale ---- */
  --type-scale: 1;
  --fs-eyebrow: calc(11px * var(--type-scale));
  --fs-body: calc(16px * var(--type-scale));
  --fs-lead: calc(19px * var(--type-scale));
  --fs-h3: calc(28px * var(--type-scale));
  --fs-h2: calc(56px * var(--type-scale));
  --fs-display: clamp(56px, calc(9vw * var(--type-scale)), 168px);

  /* ---- Space ---- */
  --gutter: clamp(20px, 3.2vw, 56px);
  --page-max: 1440px;

  /* ---- Motion ---- */
  --motion-intensity: 1;
  --ease-out-soft: cubic-bezier(.22,.61,.36,1);
  --ease-out-expo: cubic-bezier(.16,1,.3,1);
}

/* Light-variant overrides */
:root[data-theme="light"] {
  --ink-000: #f5f2ec;
  --ink-050: #efece4;
  --ink-100: #e7e3d9;
  --ink-200: #d9d4c6;
  --ink-300: #b9b3a4;
  --ink-400: #8a8675;
  --ink-600: #45433d;
  --ink-700: #2a2924;
  --ink-800: #17161a;
  --ink-900: #0c0c0e;
  --ink-950: #060607;
  --accent: #0c0c0e;
  --glass-bg: rgba(12,12,14,0.045);
  --glass-bg-strong: rgba(12,12,14,0.08);
  --glass-border: rgba(12,12,14,0.14);
  --glass-border-strong: rgba(12,12,14,0.26);
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { background: var(--ink-000); color: var(--ink-900); -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }
body {
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.5;
  font-feature-settings: "ss01","cv11";
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
img, video { max-width: 100%; display: block; }
::selection { background: var(--ink-950); color: var(--ink-000); }

/* ---- Typography helpers ---- */
.display {
  font-family: var(--font-display);
  font-weight: 300;
  letter-spacing: var(--tracking-tight);
  line-height: 0.92;
  font-style: normal;
}
.display em { font-style: italic; font-weight: 300; color: var(--ink-800); }

.eyebrow {
  font-family: var(--font-sans);
  font-size: var(--fs-eyebrow);
  font-weight: 500;
  letter-spacing: var(--tracking-ultra);
  text-transform: uppercase;
  color: var(--ink-700);
}

.h2 {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: var(--fs-h2);
  line-height: 1.02;
  letter-spacing: var(--tracking-tight);
}
.h3 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--fs-h3);
  line-height: 1.15;
  letter-spacing: var(--tracking-snug);
}
.lead {
  font-size: var(--fs-lead);
  line-height: 1.45;
  color: var(--ink-800);
  font-weight: 300;
  max-width: 62ch;
  text-wrap: pretty;
}
.mono {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-700);
}

/* ---- Layout ---- */
.page {
  position: relative;
  min-height: 100vh;
  background: var(--ink-000);
}

.section {
  position: relative;
  width: 100%;
}

.section--full {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.container {
  width: 100%;
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 0 var(--gutter);
  position: relative;
  z-index: 2;
}

/* ---- Video background (dual-layer crossfade) ---- */
.bgvid {
  position: absolute;
  inset: 0;
  overflow: hidden;
  z-index: 0;
  background: var(--ink-000);
}
.bgvid video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity 1.2s var(--ease-out-soft);
  will-change: opacity;
}
.bgvid video.is-active { opacity: 1; }
.bgvid::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(120% 80% at 50% 100%, rgba(0,0,0,.55) 0%, rgba(0,0,0,0) 55%),
    linear-gradient(180deg, rgba(6,6,7,.35) 0%, rgba(6,6,7,.15) 30%, rgba(6,6,7,.55) 100%);
  pointer-events: none;
  z-index: 1;
}
.bgvid--vignette::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(100% 70% at 50% 50%, rgba(0,0,0,0) 45%, rgba(0,0,0,.55) 100%);
  pointer-events: none;
  z-index: 1;
}

/* Subtle noise/grain over video */
.grain {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 3;
  opacity: 0.08;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 1  0 0 0 0 1  0 0 0 0 1  0 0 0 .7 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
}

/* ---- Glass surface ---- */
.glass {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-sat));
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-sat));
  border-radius: 2px;
  position: relative;
  overflow: hidden;
}
.glass::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(255,255,255,.08) 0%, rgba(255,255,255,0) 35%, rgba(255,255,255,0) 65%, rgba(255,255,255,.04) 100%);
  pointer-events: none;
}
.glass--strong {
  background: var(--glass-bg-strong);
  border-color: var(--glass-border-strong);
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 16px 28px;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  border-radius: 999px;
  transition: transform .4s var(--ease-out-soft), background .4s var(--ease-out-soft), color .4s var(--ease-out-soft), border-color .4s var(--ease-out-soft);
  white-space: nowrap;
  position: relative;
}
.btn--primary {
  background: var(--ink-950);
  color: var(--ink-000);
}
.btn--primary:hover { transform: translateY(-1px); background: #fff; }
.btn--ghost {
  border: 1px solid var(--glass-border-strong);
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  color: var(--ink-900);
}
.btn--ghost:hover { background: var(--glass-bg-strong); border-color: rgba(255,255,255,.45); }
.btn .arrow {
  display: inline-block;
  transition: transform .4s var(--ease-out-soft);
}
.btn:hover .arrow { transform: translateX(4px); }

/* ---- Nav ---- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 22px var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  transition: background .4s var(--ease-out-soft), backdrop-filter .4s var(--ease-out-soft), border-color .4s var(--ease-out-soft);
  border-bottom: 1px solid transparent;
}
.nav.is-scrolled {
  background: rgba(6,6,7,0.55);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  border-bottom-color: var(--glass-border);
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 14px;
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: var(--tracking-ultra);
  text-transform: uppercase;
  color: var(--ink-900);
}
.nav-brand-mark {
  width: 32px; height: 32px;
  display: grid; place-items: center;
  border-radius: 50%;
  background: var(--ink-950);
  color: var(--ink-000);
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 400;
  line-height: 1;
  padding-bottom: 3px;
  position: relative;
}
.nav-brand-mark::after {
  content: "";
  position: absolute;
  left: 18%; right: 18%;
  top: 46%;
  height: 1px;
  background: var(--ink-000);
  transform: rotate(-8deg);
  opacity: .65;
}
.nav-links {
  display: flex;
  gap: 6px;
  align-items: center;
  list-style: none;
  padding: 0;
  margin: 0;
}
.nav-link {
  padding: 10px 16px;
  font-size: 12px;
  font-weight: 400;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--ink-800);
  border-radius: 999px;
  transition: color .3s, background .3s;
  position: relative;
}
.nav-link:hover { color: var(--ink-950); background: var(--glass-bg); }
.nav-link.is-active { color: var(--ink-950); }
.nav-link.is-active::after {
  content: "";
  position: absolute;
  left: 50%; bottom: 3px;
  width: 4px; height: 4px;
  transform: translateX(-50%);
  background: var(--ink-950);
  border-radius: 50%;
}
.nav-cta {
  padding: 10px 20px;
  font-size: 11px;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  border: 1px solid var(--glass-border-strong);
  border-radius: 999px;
  color: var(--ink-950);
  transition: all .3s;
}
.nav-cta:hover { background: var(--ink-950); color: var(--ink-000); border-color: var(--ink-950); }

@media (max-width: 820px) {
  .nav-links { display: none; }
}

/* ---- Footer ---- */
.footer {
  position: relative;
  padding: 120px var(--gutter) 40px;
  background: var(--ink-000);
  border-top: 1px solid var(--glass-border);
  color: var(--ink-700);
}
.footer-inner {
  max-width: var(--page-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 48px;
}
.footer h4 {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: var(--tracking-ultra);
  text-transform: uppercase;
  color: var(--ink-800);
  margin: 0 0 20px;
}
.footer ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 10px; }
.footer a:hover { color: var(--ink-950); }
.footer-bottom {
  max-width: var(--page-max);
  margin: 80px auto 0;
  padding-top: 24px;
  border-top: 1px solid var(--glass-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--ink-600);
}
.footer-wordmark {
  font-family: var(--font-display);
  font-size: clamp(80px, 18vw, 280px);
  line-height: .85;
  letter-spacing: -0.03em;
  color: var(--ink-200);
  margin: 80px 0 40px;
  user-select: none;
  pointer-events: none;
  overflow: hidden;
}
@media (max-width: 820px) {
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .footer-bottom { flex-direction: column; gap: 12px; align-items: flex-start; }
}

/* ---- Tiny decorative bits ---- */
.rule {
  height: 1px;
  background: var(--glass-border);
  width: 100%;
}
.dot { width: 5px; height: 5px; border-radius: 50%; background: var(--ink-800); display: inline-block; }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px 8px 10px;
  border-radius: 999px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(14px);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--ink-900);
}
.tag .dot { background: var(--ink-900); box-shadow: 0 0 10px var(--ink-900); }

/* Scroll cue */
.scroll-cue {
  position: absolute;
  left: 50%;
  bottom: 36px;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  color: var(--ink-700);
  font-size: 10px;
  letter-spacing: var(--tracking-ultra);
  text-transform: uppercase;
  z-index: 4;
}
.scroll-cue .line {
  width: 1px;
  height: 44px;
  background: linear-gradient(var(--ink-700), transparent);
  animation: cueDrop 2.4s var(--ease-out-soft) infinite;
}
@keyframes cueDrop {
  0% { transform: scaleY(0); transform-origin: top; }
  55% { transform: scaleY(1); transform-origin: top; }
  60% { transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* Utility */
.u-center { text-align: center; }
.u-spread { display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.u-stack-sm > * + * { margin-top: 10px; }
.u-stack-md > * + * { margin-top: 20px; }
.u-stack-lg > * + * { margin-top: 40px; }

/* Prefers reduced motion */
@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}