/* Global Styles for X21 Landing Page */
:root {
  --bg: #ffffff;
  --bg-alt: #f5f7fa;
  --bg-accent: linear-gradient(135deg,#ffffff,#f3f6fb 60%);
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  --text: #0f172a;
  --text-dim: #475569;
  --brand: linear-gradient(90deg,#4f46e5,#6366f1,#8b5cf6,#ec4899);
  --brand-solid: #4f46e5;
  --brand-accent: #ec4899;
  --success: #10b981;
  --warn: #f59e0b;
  --danger: #ef4444;
  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 18px;
  --radius-full: 999px;
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  --shadow-sm: 0 4px 12px -2px rgba(0,0,0,0.4);
  --shadow-md: 0 8px 28px -6px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 0 1px #6366f1, 0 0 24px -4px #6366f1;
  --w-container: 1180px;
  --transition: 220ms cubic-bezier(.4,0,.2,1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* Header */
.site-header { position: fixed; top:0; left:0; right:0; z-index:40; backdrop-filter: saturate(180%) blur(14px); background: rgba(255,255,255,0.75); border-bottom: 1px solid rgba(226,232,240,0.6); display:flex; }
.site-header-inner { width:100%; max-width: var(--w-container); margin:0 auto; padding:.85rem 1.5rem; display:flex; align-items:center; gap:1.25rem; }
.brand { display:flex; align-items:center; gap:.65rem; font-weight:600; font-size:1rem; letter-spacing:-0.01em; color: var(--text); text-decoration:none; }
.brand:hover { opacity:.9; }
.brand-logo { height:34px; width:auto; display:block; }
.spacer { flex:1; }

body { padding-top:70px; }

::selection { background: #6366f1; color: #fff; }

h1,h2,h3,h4 { font-weight: 600; line-height: 1.12; letter-spacing: -0.02em; }
p { line-height: 1.6; }

img { max-width: 100%; height: auto; display: block; }

.container { width: 100%; max-width: var(--w-container); margin: 0 auto; padding: 0 1.5rem; }

.grid { display: grid; gap: 2.25rem; }
.flex { display: flex; }
.center { justify-content: center; align-items: center; }
.stack { display: flex; flex-direction: column; gap: 1.25rem; }

button, .btn { cursor: pointer; font: inherit; font-weight: 500; display: inline-flex; align-items: center; gap: .5rem; border-radius: var(--radius-full); border: 1px solid transparent; position: relative; isolation: isolate; white-space: nowrap; }
.btn-primary { background: var(--brand); color: #fff; padding: .9rem 1.4rem; box-shadow: var(--shadow-sm); }
.btn-primary:hover { filter: brightness(1.1); }
.btn-outline { background: rgba(255,255,255,0.04); color: var(--text); border-color: var(--border-strong); padding: .85rem 1.3rem; }
.btn-outline:hover { border-color: #6366f1; color: #fff; }

.badge { font-size: .7rem; letter-spacing: .08em; font-weight: 600; text-transform: uppercase; background: linear-gradient(90deg,#6366f1,#8b5cf6); color: #fff; padding: .35rem .6rem .3rem; border-radius: var(--radius-full); display: inline-flex; align-items: center; gap: .35rem; }

.section { position: relative; padding: clamp(3.5rem,7vw,6.5rem) 0; }
.section-tight { padding: clamp(2.5rem,6vw,4.75rem) 0; }

.hero { padding-top: 1em; }

.gradient-text { background: var(--brand); -webkit-background-clip: text; color: transparent; }

.card { background: #ffffff; border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 1.5rem 1.3rem 1.3rem; position: relative; overflow: hidden; }
.card:hover { border-color: var(--border-strong); box-shadow: 0 4px 14px -2px rgba(15,23,42,0.08), 0 2px 4px rgba(15,23,42,0.06); }
.card::before { content: ""; position: absolute; inset: 0; opacity: 0; background: radial-gradient(circle at 30% 15%,rgba(99,102,241,.18),transparent 60%); transition: var(--transition); }
.card:hover::before { opacity: 1; }

.logo-marquee { position: relative; overflow: hidden; mask: linear-gradient(90deg,transparent, #000 8%, #000 92%, transparent); }
.logo-track { display: flex; width: max-content; animation: marquee 38s linear infinite; gap: 4rem; }
.logo-track img { height: 40px; width: auto; filter: grayscale(1) brightness(.85); opacity: .75; transition: var(--transition); }
.logo-track img:hover { filter: grayscale(0) brightness(1); opacity: 1; }

@keyframes marquee { to { transform: translateX(-50%); } }

.screenshots { display: grid; grid-auto-flow: column; grid-auto-columns: min(70%,560px); gap: 2.4rem; overflow-x: auto; padding: 1rem .5rem 1rem 1rem; scroll-snap-type: x mandatory; }
.screenshots figure { scroll-snap-align: start; margin: 0; position: relative; }
.screenshots img { border-radius: var(--radius-md); border: 1px solid var(--border); box-shadow: var(--shadow-md); background: #ffffff; }

.fade-blur { opacity: 0; transform: translateY(24px); filter: blur(10px); transition: 900ms cubic-bezier(.22,.9,.25,1), filter 1300ms ease; }
.fade-blur.in-view { opacity: 1; transform: translateY(0); filter: blur(0); }

.divider-glow { height: 1px; width: 100%; background: linear-gradient(90deg, transparent, #6366f1 30%, #8b5cf6 70%, transparent); opacity: .35; margin: 0; border: none; }

footer { background: var(--bg-alt); border-top: 1px solid var(--border); padding: 3rem 0 4rem; }
footer a { color: var(--text-dim); text-decoration: none; }
footer a:hover { color: var(--text); }

/* Media Queries */
@media (max-width: 900px) {
  .features-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 620px) {
  .features-grid { grid-template-columns: 1fr; }
  h1 { font-size: clamp(2.2rem,8.5vw,3.1rem); }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .logo-track { animation: none; }
}