/* Global AI Product Index — market observatory design system.
   Dense, flat and data-led: inspired by financial terminals and public datasets. */

:root,
[data-theme="dark"] {
  color-scheme: dark;
  --bg: #09090b;
  --bg-solid: #0e0e12;
  --elev: rgba(255, 255, 255, 0.035);
  --elev-strong: rgba(255, 255, 255, 0.06);
  --fg: #fafafa;
  --muted: #a1a1aa;
  --faint: #6b6b76;
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.16);
  --accent: #20d9c2;
  --accent-2: #ffb000;
  --accent-soft: rgba(32, 217, 194, 0.1);
  --header-bg: #09090b;
  --shadow-md: none;
  --shadow-glow: none;
}

[data-theme="light"] {
  color-scheme: light;
  --bg: #fafafa;
  --bg-solid: #ffffff;
  --elev: rgba(9, 9, 11, 0.03);
  --elev-strong: rgba(9, 9, 11, 0.055);
  --fg: #09090b;
  --muted: #52525b;
  --faint: #8e8e96;
  --border: rgba(9, 9, 11, 0.08);
  --border-strong: rgba(9, 9, 11, 0.18);
  --accent: #0f766e;
  --accent-2: #b45309;
  --accent-soft: rgba(15, 118, 110, 0.08);
  --header-bg: rgba(250, 250, 250, 0.85);
  --shadow-md: 0 8px 24px rgba(9, 9, 11, 0.08);
  --shadow-glow: none;
}

:root {
  --mono: ui-monospace, "SF Mono", "Cascadia Code", Menlo, Consolas, monospace;
  --radius: 2px;
  --radius-lg: 2px;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background 0.3s ease, color 0.3s ease;
}

/* Subtle film grain for depth */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.028;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");
}

body > * { position: relative; z-index: 1; }

::selection { background: var(--accent); color: #ffffff; }

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

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }

.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  z-index: 200;
  padding: 0.6rem 1.2rem;
  background: var(--accent);
  color: var(--bg);
  font-weight: 600;
  font-size: 0.875rem;
  border-radius: var(--radius);
  transition: top 0.2s var(--ease-out);
}
.skip-link:focus { top: 1rem; }

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 999px; border: 3px solid var(--bg); }
::-webkit-scrollbar-track { background: transparent; }

.container { max-width: 1120px; margin: 0 auto; padding: 0 1.5rem; }
main.container { padding-top: 0; padding-bottom: 4rem; }

.mono { font-family: var(--mono); font-variant-numeric: tabular-nums; }

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--header-bg);
  border-bottom: 1px solid var(--border-strong);
  transition: border-color 0.3s ease, background 0.3s ease;
}
.site-header.scrolled { border-bottom-color: var(--border); }
.site-header .container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.4rem 1.25rem;
  padding-top: 0.8rem;
  padding-bottom: 0.8rem;
}
.brand { display: inline-flex; align-items: center; gap: 0.55rem; font-weight: 650; color: var(--fg); font-size: 0.98rem; letter-spacing: -0.01em; }
.brand:hover { text-decoration: none; opacity: 0.8; }
.brand svg { flex: none; }
.header-right { display: flex; align-items: center; gap: 1.4rem; }
.site-header nav { display: flex; flex-wrap: wrap; gap: 1.35rem; }
.site-header nav a { color: var(--muted); font-size: 0.88rem; transition: color 0.2s ease; }
.site-header nav a:hover { color: var(--fg); text-decoration: none; }

#theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 2px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease;
}
#theme-toggle:hover { color: var(--fg); border-color: var(--border-strong); }
#theme-toggle .icon-sun { display: none; }
[data-theme="light"] #theme-toggle .icon-sun { display: block; }
[data-theme="light"] #theme-toggle .icon-moon { display: none; }

/* ---------- Typography ---------- */

h1, h2, h3 { letter-spacing: -0.03em; line-height: 1.12; text-wrap: balance; }
h1 { font-size: clamp(2.1rem, 4.5vw, 3rem); margin: 0 0 0.85rem; font-weight: 700; }
h2 { font-size: clamp(1.4rem, 2.6vw, 1.85rem); margin: 0 0 1rem; font-weight: 650; }
h3 { font-size: 1.1rem; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin: 0 0 0.9rem;
}
.eyebrow::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
}

.page-head { padding: 4rem 0 2rem; max-width: 46rem; }
.page-sub { color: var(--muted); font-size: 1.06rem; margin: 0; }

.section { margin-top: 5rem; }
.section-head { max-width: 46rem; margin-bottom: 1.9rem; }
.section-head p:not(.eyebrow) { color: var(--muted); margin: 0; }

/* ---------- Hero ---------- */

.hero { position: relative; text-align: left; padding: 5rem 0 3rem; border-bottom: 1px solid var(--border-strong); }
.hero-bg { position: absolute; inset: -4.5rem 0 0; overflow: hidden; pointer-events: none; }
.hero-bg::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 0%, black 20%, transparent 75%);
  mask-image: radial-gradient(ellipse 70% 60% at 50% 0%, black 20%, transparent 75%);
}
.hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: none;
  filter: none;
  animation: none;
}
.hero > * { position: relative; }
.hero h1 {
  font-size: clamp(2.7rem, 7vw, 4.8rem);
  font-weight: 720;
  letter-spacing: -0.04em;
  line-height: 1.04;
  margin: 0 0 1.2rem;
  max-width: 17ch;
}
.gradient-text { color: var(--accent); }
.hero-sub { color: var(--muted); font-size: clamp(1.05rem, 2vw, 1.22rem); max-width: 38rem; margin: 0 0 2.2rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.8rem; justify-content: flex-start; }

/* ---------- Ticker ---------- */

.ticker {
  overflow: hidden;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 0.85rem 0;
  -webkit-mask-image: linear-gradient(90deg, transparent, black 8%, black 92%, transparent);
  mask-image: linear-gradient(90deg, transparent, black 8%, black 92%, transparent);
}
.ticker-track { display: flex; width: max-content; animation: tick 48s linear infinite; }
.ticker:hover .ticker-track { animation-play-state: paused; }
@keyframes tick { to { transform: translateX(-50%); } }
.ticker-group { display: flex; align-items: center; }
.ticker-item {
  display: inline-flex;
  align-items: center;
  gap: 1.2rem;
  padding: 0 0.6rem;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.82rem;
  white-space: nowrap;
  transition: color 0.2s ease;
}
a.ticker-item:hover { color: var(--fg); text-decoration: none; }
.ticker-sep { color: var(--accent); font-size: 0.5rem; }

/* ---------- Buttons ---------- */

.button {
  display: inline-block;
  background: var(--fg);
  color: var(--bg);
  border: 1px solid var(--fg);
  border-radius: 2px;
  padding: 0.78rem 1.75rem;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.25s var(--ease-out), box-shadow 0.25s var(--ease-out), opacity 0.2s ease;
}
.button:hover { text-decoration: none; transform: translateY(-1px); box-shadow: var(--shadow-glow); }
.button.secondary { background: transparent; color: var(--fg); border-color: var(--border-strong); }
.button.secondary:hover { border-color: var(--fg); box-shadow: none; }

/* ---------- Stats ---------- */

.stats { display: flex; flex-wrap: wrap; gap: 2.5rem 4.5rem; justify-content: center; margin: 0.5rem 0 0; }
.stat { text-align: center; }
.stat strong {
  display: block;
  font-size: clamp(2.5rem, 5vw, 3.6rem);
  font-weight: 720;
  letter-spacing: -0.035em;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  background: linear-gradient(180deg, var(--fg) 30%, var(--muted));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stat span { color: var(--faint); font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.1em; text-transform: uppercase; }

/* ---------- Cards & grids ---------- */

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 1rem; }
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  background: var(--elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  color: var(--fg);
  overflow: hidden;
  transition: transform 0.35s var(--ease-out), border-color 0.3s ease, box-shadow 0.35s var(--ease-out);
}
.card::before { display: none; }
.card:hover { text-decoration: none; border-color: var(--accent); background: var(--elev-strong); }
.card:hover::before { opacity: 0; }
.card > * { position: relative; }
.card strong { font-size: 1.05rem; letter-spacing: -0.015em; }
.card > span { color: var(--accent); font-family: var(--mono); font-size: 0.75rem; letter-spacing: 0.06em; text-transform: uppercase; }
.card p { color: var(--muted); font-size: 0.9rem; margin: 0.3rem 0 0; }
.card .arrow { margin-top: auto; padding-top: 1rem; color: var(--faint); }

/* ---------- Link list ---------- */

.link-list { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--border); }
.link-list li { border-bottom: 1px solid var(--border); }
.link-list a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.05rem 0.5rem;
  color: var(--fg);
  border-radius: 10px;
  transition: background 0.2s ease, transform 0.25s var(--ease-out);
}
.link-list a:hover { text-decoration: none; background: var(--elev); transform: translateX(4px); }
.link-list-main { display: flex; align-items: baseline; gap: 0.7rem; flex-wrap: wrap; }
.link-list-meta { color: var(--faint); font-family: var(--mono); font-size: 0.8rem; white-space: nowrap; }

.arrow { display: inline-block; transition: transform 0.25s var(--ease-out); }
a:hover .arrow { transform: translateX(4px); color: var(--accent); }

/* ---------- Promo / gradient-border panel ---------- */

.promo {
  position: relative;
  margin-top: 5.5rem;
  border-radius: var(--radius-lg);
  padding: clamp(2.4rem, 5vw, 3.6rem);
  text-align: center;
  border: 1px solid transparent;
  background:
    linear-gradient(var(--bg-solid), var(--bg-solid)) padding-box,
    linear-gradient(120deg, var(--accent), transparent 45%, var(--accent-2)) border-box;
  overflow: hidden;
}
.promo::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(60% 90% at 50% 0%, var(--accent-soft), transparent 70%);
  pointer-events: none;
}
.promo > * { position: relative; }
.promo h2 { margin-top: 0; font-size: clamp(1.5rem, 3vw, 2rem); }
.promo p { color: var(--muted); max-width: 32rem; margin: 0.4rem auto 1.7rem; }

/* ---------- Tables ---------- */

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-solid);
}
table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
th, td { text-align: left; padding: 0.9rem 1.15rem; border-bottom: 1px solid var(--border); vertical-align: middle; }
th {
  color: var(--faint);
  font-family: var(--mono);
  font-weight: 500;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  background: var(--elev);
}
tbody tr { transition: background 0.15s ease, box-shadow 0.15s ease; }
tbody tr:hover { background: var(--elev); box-shadow: inset 2px 0 0 var(--accent); }
tbody tr:last-child td { border-bottom: none; }
.num { text-align: right; font-family: var(--mono); font-variant-numeric: tabular-nums; }
.bar-cell { min-width: 12rem; }
.bar {
  display: inline-block;
  height: 0.45rem;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  border-radius: 2px;
  margin-right: 0.6rem;
  min-width: 2px;
  vertical-align: middle;
  box-shadow: 0 0 12px var(--accent-soft);
}

/* ---------- Badges, tags, code ---------- */

.badge {
  display: inline-block;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: 2px;
  padding: 0.2rem 0.8rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  margin: 0.15rem 0.25rem 0.15rem 0;
  transition: color 0.2s ease, border-color 0.2s ease;
}
a.badge:hover { text-decoration: none; border-color: var(--accent); color: var(--accent); }
.tag { display: inline-block; border: 1px solid var(--border); color: var(--faint); border-radius: 999px; padding: 0.1rem 0.65rem; font-family: var(--mono); font-size: 0.72rem; margin-right: 0.35rem; }
code { background: var(--elev-strong); border-radius: 6px; padding: 0.15rem 0.45rem; font-family: var(--mono); font-size: 0.85em; }

/* ---------- Filters ---------- */

.filters { display: flex; flex-wrap: wrap; gap: 0.7rem; align-items: center; margin: 0 0 1.4rem; }
.filters input, .filters select {
  padding: 0.68rem 1.15rem;
  border: 1px solid var(--border);
  border-radius: 2px;
  background: var(--elev);
  color: var(--fg);
  font-size: 0.92rem;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
  appearance: none;
}
.filters select {
  padding-right: 2.2rem;
  background-image: linear-gradient(45deg, transparent 50%, var(--muted) 50%), linear-gradient(135deg, var(--muted) 50%, transparent 50%);
  background-position: calc(100% - 18px) 50%, calc(100% - 13px) 50%;
  background-size: 5px 5px;
  background-repeat: no-repeat;
}
.filters input::placeholder { color: var(--faint); }
.filters input:focus, .filters select:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 4px var(--accent-soft); }
.filters input { flex: 1 1 17rem; }
#filter-count { font-family: var(--mono); font-size: 0.78rem; }

/* ---------- Product detail ---------- */

.crumb { color: var(--faint); font-family: var(--mono); font-size: 0.78rem; padding-top: 2.5rem; letter-spacing: 0.02em; }
.company-line { color: var(--muted); margin-top: -0.3rem; font-size: 1.05rem; }
.badges { margin: 1.15rem 0 0.4rem; }
.desc { font-size: 1.15rem; max-width: 44rem; }

.facts { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 0.9rem; margin: 1.9rem 0; }
.facts div { background: var(--elev); border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem 1.2rem; }
.facts dt { color: var(--faint); font-family: var(--mono); font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.1em; }
.facts dd { margin: 0.3rem 0 0; font-weight: 600; overflow-wrap: anywhere; }
.facts dd a { color: var(--fg); }

/* ---------- Download cards ---------- */

.download-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(270px, 1fr)); gap: 1rem; margin: 1.5rem 0; }
.download-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  background: var(--elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 1.6rem;
  color: var(--fg);
  overflow: hidden;
  transition: transform 0.35s var(--ease-out), border-color 0.3s ease, box-shadow 0.35s var(--ease-out);
}
.download-card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(300px circle at var(--mx, 50%) var(--my, 50%), var(--accent-soft), transparent 65%);
  opacity: 0;
  transition: opacity 0.35s ease;
  pointer-events: none;
}
.download-card:hover { text-decoration: none; transform: translateY(-3px); border-color: var(--border-strong); box-shadow: var(--shadow-md); }
.download-card:hover::before { opacity: 1; }
.download-card > * { position: relative; }
.download-card strong { font-size: 1.08rem; }
.download-card span { color: var(--muted); font-size: 0.9rem; }
.download-card .arrow { margin-top: 0.9rem; color: var(--accent); font-family: var(--mono); font-size: 0.8rem; }

/* ---------- Prose ---------- */

.prose { max-width: 46rem; }
.prose h2 { margin-top: 2.75rem; }
.prose ul { padding-left: 1.3rem; }
.prose li { margin: 0.35rem 0; }
.prose .muted, .prose p { color: var(--fg); }

/* ---------- FAQ ---------- */

.faq { border-top: 1px solid var(--border); }
.faq details { border-bottom: 1px solid var(--border); }
.faq summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1.15rem 0.2rem;
  font-weight: 600;
  font-size: 1.02rem;
  letter-spacing: -0.015em;
  transition: color 0.2s ease;
}
.faq summary:hover { color: var(--accent); }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  color: var(--faint);
  font-weight: 400;
  font-size: 1.35rem;
  line-height: 1;
  transition: transform 0.25s var(--ease-out), color 0.2s ease;
}
.faq details[open] summary::after { transform: rotate(45deg); color: var(--accent); }
.faq details p { color: var(--muted); margin: 0 0 1.15rem; max-width: 44rem; }

/* ---------- Footer ---------- */

.site-footer { border-top: 1px solid var(--border); margin-top: 5rem; color: var(--faint); font-size: 0.85rem; }
.site-footer .container { padding-top: 2rem; padding-bottom: 2.5rem; display: flex; flex-wrap: wrap; gap: 0.5rem 2rem; justify-content: space-between; }
.site-footer p { margin: 0; }
.site-footer a { color: var(--muted); }
.site-footer a:hover { color: var(--fg); }

/* ---------- Reveal animations ---------- */

.js [data-reveal] {
  opacity: 0;
  transform: translateY(22px);
  filter: blur(5px);
  transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out), filter 0.8s var(--ease-out);
  transition-delay: var(--reveal-delay, 0s);
}
.js [data-reveal].is-visible { opacity: 1; transform: none; filter: none; }

.js .grid > [data-reveal]:nth-child(2), .js .stats > [data-reveal]:nth-child(2), .js .download-grid > [data-reveal]:nth-child(2) { --reveal-delay: 0.06s; }
.js .grid > [data-reveal]:nth-child(3), .js .stats > [data-reveal]:nth-child(3), .js .download-grid > [data-reveal]:nth-child(3) { --reveal-delay: 0.12s; }
.js .grid > [data-reveal]:nth-child(4) { --reveal-delay: 0.18s; }
.js .grid > [data-reveal]:nth-child(5) { --reveal-delay: 0.24s; }
.js .grid > [data-reveal]:nth-child(6) { --reveal-delay: 0.3s; }
.js .grid > [data-reveal]:nth-child(n+7) { --reveal-delay: 0.36s; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .ticker-track { animation: none; }
  .hero-bg::after { animation: none; }
  .js [data-reveal] { opacity: 1; transform: none; filter: none; transition: none; }
  *, *::before, *::after { transition-duration: 0.01ms !important; }
}

/* ---------- Small screens ---------- */

@media (max-width: 640px) {
  .hero { padding: 4.5rem 0 3rem; }
  .page-head { padding-top: 2.75rem; }
  .section { margin-top: 3.5rem; }
  .stats { gap: 1.75rem 2.5rem; }
  .site-header nav { gap: 0.95rem; }
  .header-right { gap: 0.9rem; }
}