/* ==========================================================================
   XLGateway — Enterprise AI Infrastructure
   Design system: dark base + gradient accents, modern SaaS
   ========================================================================== */

:root {
  color-scheme: dark;

  /* Base surfaces */
  --bg: #07080f;
  --bg-elev: #0d0f1a;
  --bg-card: #11142180;
  --bg-card-solid: #121527;
  --border: #1f2438;
  --border-strong: #2a3150;

  /* Text */
  --text: #eef0f7;
  --text-soft: #aab1c6;
  --text-dim: #6b7390;

  /* Brand gradient */
  --grad-1: #7c5cff;   /* violet */
  --grad-2: #4d8dff;   /* blue   */
  --grad-3: #29d3c2;   /* teal   */
  --accent: #8a6dff;
  --accent-soft: #b9a6ff;

  /* Effects */
  --radius: 18px;
  --radius-sm: 12px;
  --radius-lg: 28px;
  --maxw: 1180px;
  --shadow: 0 24px 60px -20px rgba(0, 0, 0, 0.65);
  --glow: 0 0 0 1px rgba(124, 92, 255, 0.18), 0 18px 50px -18px rgba(77, 141, 255, 0.35);

  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

/* ----------------------------------- reset --------------------------------- */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; }
h1, h2, h3, h4 { margin: 0; line-height: 1.1; letter-spacing: -0.02em; font-weight: 600; }
p { margin: 0; }

/* ambient background glows */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(60% 50% at 15% 0%, rgba(124, 92, 255, 0.18), transparent 60%),
    radial-gradient(55% 45% at 85% 5%, rgba(77, 141, 255, 0.16), transparent 60%),
    radial-gradient(50% 50% at 50% 100%, rgba(41, 211, 194, 0.10), transparent 70%);
  pointer-events: none;
}

/* ----------------------------------- layout -------------------------------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}
section { position: relative; }
.section-pad { padding: 110px 0; }
@media (max-width: 760px) { .section-pad { padding: 72px 0; } }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-soft);
  padding: 7px 14px;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: rgba(124, 92, 255, 0.08);
}
.section-head { max-width: 660px; margin-bottom: 56px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-head h2 {
  font-size: clamp(30px, 4.6vw, 46px);
  margin: 22px 0 16px;
}
.section-head p { color: var(--text-soft); font-size: 18px; }

.grad-text {
  background: linear-gradient(100deg, var(--grad-1), var(--grad-2) 55%, var(--grad-3));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ----------------------------------- buttons ------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  font-size: 15px;
  font-weight: 600;
  padding: 13px 24px;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: transform 0.18s ease, box-shadow 0.25s ease, background 0.25s ease, border-color 0.25s ease;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary {
  background: linear-gradient(100deg, var(--grad-1), var(--grad-2));
  color: #fff;
  box-shadow: var(--glow);
}
.btn-primary:hover { box-shadow: 0 0 0 1px rgba(124,92,255,0.4), 0 24px 60px -16px rgba(77,141,255,0.6); }
.btn-ghost {
  background: rgba(255, 255, 255, 0.03);
  color: var(--text);
  border-color: var(--border-strong);
}
.btn-ghost:hover { background: rgba(255, 255, 255, 0.07); border-color: var(--accent); }
.btn-lg { padding: 16px 30px; font-size: 16px; }

/* ----------------------------------- navbar -------------------------------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(7, 8, 15, 0.72);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand { display: flex; align-items: center; gap: 11px; font-weight: 700; font-size: 18px; letter-spacing: -0.02em; }
.brand .logo {
  width: 30px; height: 30px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--grad-1), var(--grad-2) 60%, var(--grad-3));
  display: grid; place-items: center;
  font-size: 15px; font-weight: 800; color: #fff;
  box-shadow: var(--glow);
}
.nav-links { display: flex; align-items: center; gap: 6px; }
.nav-links a {
  font-size: 15px; font-weight: 500; color: var(--text-soft);
  padding: 8px 14px; border-radius: 10px; transition: color 0.2s, background 0.2s;
}
.nav-links a:hover, .nav-links a.active { color: var(--text); background: rgba(255,255,255,0.05); }
.nav-cta { display: flex; align-items: center; gap: 10px; }
.nav-toggle {
  display: none; background: none; border: 0; color: var(--text); padding: 6px;
}
.nav-toggle svg { width: 26px; height: 26px; }

@media (max-width: 900px) {
  .nav-links, .nav-cta .btn-ghost { display: none; }
  .nav-toggle { display: block; }
  .nav.open .nav-links {
    display: flex; flex-direction: column; align-items: stretch;
    position: absolute; top: 70px; left: 0; right: 0;
    background: var(--bg-elev); border-bottom: 1px solid var(--border);
    padding: 14px 24px 22px; gap: 4px;
  }
  .nav.open .nav-links a { padding: 12px 14px; font-size: 16px; }
}

/* ----------------------------------- hero ---------------------------------- */
.hero { padding: 92px 0 96px; text-align: center; }
.hero .eyebrow { margin-bottom: 30px; }
.hero h1 {
  font-size: clamp(44px, 8vw, 92px);
  font-weight: 700;
  line-height: 0.98;
  letter-spacing: -0.035em;
}
.hero .sub {
  max-width: 660px; margin: 28px auto 0;
  font-size: clamp(17px, 2.2vw, 21px);
  color: var(--text-soft);
}
.hero-actions { margin-top: 40px; display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.hero-trust {
  margin-top: 54px; display: flex; gap: 12px 34px; justify-content: center; flex-wrap: wrap;
  color: var(--text-dim); font-size: 13px; font-weight: 500; letter-spacing: 0.04em;
}

/* model marquee under hero */
.logo-row {
  margin-top: 46px; display: flex; flex-wrap: wrap; gap: 12px; justify-content: center;
}
.logo-pill {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 10px 18px; border: 1px solid var(--border); border-radius: 12px;
  background: var(--bg-card); color: var(--text-soft); font-weight: 600; font-size: 14px;
}
.logo-pill .dot { width: 9px; height: 9px; border-radius: 50%; background: var(--accent); }

/* ----------------------------------- cards --------------------------------- */
.grid { display: grid; gap: 22px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 900px) { .grid-3 { grid-template-columns: 1fr; } .grid-2 { grid-template-columns: 1fr; } }

.card {
  position: relative;
  border: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(255,255,255,0.025), rgba(255,255,255,0.0));
  border-radius: var(--radius);
  padding: 30px;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
  overflow: hidden;
}
.card:hover { transform: translateY(-4px); border-color: var(--border-strong); box-shadow: var(--shadow); }
.card .card-glow {
  position: absolute; inset: -1px -1px auto -1px; height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0; transition: opacity 0.3s;
}
.card:hover .card-glow { opacity: 1; }

.icon-badge {
  width: 46px; height: 46px; border-radius: 13px;
  display: grid; place-items: center; margin-bottom: 18px;
  background: linear-gradient(135deg, rgba(124,92,255,0.2), rgba(77,141,255,0.2));
  border: 1px solid var(--border-strong);
  color: var(--accent-soft);
}
.icon-badge svg { width: 22px; height: 22px; }
.card h3 { font-size: 21px; margin-bottom: 6px; }
.card .card-meta { font-size: 13px; color: var(--accent-soft); font-weight: 600; margin-bottom: 12px; }
.card p { color: var(--text-soft); font-size: 15px; }

/* feature chips list inside ecosystem cards */
.chip-list { list-style: none; padding: 0; margin: 18px 0 0; display: flex; flex-wrap: wrap; gap: 8px; }
.chip-list li {
  font-size: 13px; font-weight: 500; color: var(--text-soft);
  padding: 6px 12px; border: 1px solid var(--border); border-radius: 999px;
  background: rgba(255,255,255,0.02);
}

/* ----------------------------------- stats --------------------------------- */
.stats-band {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(120% 120% at 0% 0%, rgba(124,92,255,0.12), transparent 50%),
    radial-gradient(120% 120% at 100% 100%, rgba(41,211,194,0.10), transparent 55%),
    var(--bg-elev);
  padding: 56px 44px;
}
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 30px; }
@media (max-width: 820px) { .stats-grid { grid-template-columns: repeat(2, 1fr); } }
.stat .num {
  font-size: clamp(34px, 5vw, 52px); font-weight: 700; letter-spacing: -0.03em;
  background: linear-gradient(100deg, #fff, var(--accent-soft));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.stat .label { color: var(--text-soft); font-size: 15px; margin-top: 6px; }

/* ----------------------------------- model grid ---------------------------- */
.model-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
@media (max-width: 820px) { .model-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .model-grid { grid-template-columns: 1fr; } }
.model {
  display: flex; align-items: center; gap: 16px;
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: var(--bg-card); padding: 20px;
  transition: border-color 0.25s, transform 0.25s;
}
.model:hover { border-color: var(--border-strong); transform: translateY(-3px); }
.model .m-logo {
  width: 44px; height: 44px; flex: none; border-radius: 11px;
  display: grid; place-items: center; font-weight: 800; font-size: 17px; color: #fff;
}
.model .m-name { font-weight: 600; font-size: 16px; }
.model .m-sub { font-size: 13px; color: var(--text-dim); }

/* gateway callout */
.gateway-callout {
  margin-top: 40px; text-align: center;
  padding: 40px; border: 1px dashed var(--border-strong); border-radius: var(--radius);
  background: rgba(124,92,255,0.05);
}
.gateway-callout .label { font-size: 13px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--text-dim); }
.gateway-callout .big { font-size: clamp(22px, 3.4vw, 32px); font-weight: 700; margin-top: 8px; }

/* ----------------------------------- CTA band ------------------------------ */
.cta-band {
  border-radius: var(--radius-lg);
  text-align: center;
  padding: 72px 32px;
  border: 1px solid var(--border-strong);
  background:
    radial-gradient(90% 140% at 50% 0%, rgba(124,92,255,0.22), transparent 60%),
    var(--bg-elev);
}
.cta-band h2 { font-size: clamp(28px, 4.4vw, 42px); }
.cta-band p { color: var(--text-soft); margin: 16px auto 30px; max-width: 540px; }
.cta-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ----------------------------------- footer -------------------------------- */
.footer { border-top: 1px solid var(--border); padding: 64px 0 40px; margin-top: 40px; }
.footer-grid { display: grid; grid-template-columns: 1.6fr repeat(3, 1fr); gap: 40px; }
@media (max-width: 820px) { .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; } }
.footer .brand { margin-bottom: 16px; }
.footer-about { color: var(--text-dim); font-size: 14px; max-width: 300px; }
.footer h4 { font-size: 13px; text-transform: uppercase; letter-spacing: 0.12em; color: var(--text-dim); margin-bottom: 16px; font-weight: 600; }
.footer ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 11px; }
.footer ul a { color: var(--text-soft); font-size: 15px; transition: color 0.2s; }
.footer ul a:hover { color: var(--text); }
.footer-bottom {
  margin-top: 48px; padding-top: 26px; border-top: 1px solid var(--border);
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
  color: var(--text-dim); font-size: 13px;
}

/* ----------------------------------- page header --------------------------- */
.page-hero { padding: 80px 0 30px; text-align: center; }
.page-hero h1 { font-size: clamp(38px, 6vw, 64px); }
.page-hero p { color: var(--text-soft); font-size: 19px; max-width: 600px; margin: 22px auto 0; }

/* ----------------------------------- about prose --------------------------- */
.prose { max-width: 760px; margin: 0 auto; color: var(--text-soft); font-size: 18px; }
.prose p + p { margin-top: 20px; }
.value-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; margin-top: 40px; }
@media (max-width: 720px) { .value-grid { grid-template-columns: 1fr; } }

/* ----------------------------------- product matrix ------------------------ */
.product-row {
  display: grid; grid-template-columns: 220px 1fr; gap: 30px; align-items: start;
  padding: 36px 0; border-top: 1px solid var(--border);
}
@media (max-width: 720px) { .product-row { grid-template-columns: 1fr; gap: 14px; } }
.product-row .p-name { font-size: 26px; font-weight: 700; }
.product-row .p-tag { color: var(--accent-soft); font-size: 14px; font-weight: 600; margin-top: 6px; }
.product-row .p-badge {
  display: inline-block; margin-top: 12px; font-size: 12px; font-weight: 600;
  padding: 4px 11px; border-radius: 999px; border: 1px solid var(--border-strong);
  color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.1em;
}

/* ----------------------------------- form ---------------------------------- */
.form-wrap {
  max-width: 640px; margin: 0 auto;
  border: 1px solid var(--border); border-radius: var(--radius-lg);
  background: var(--bg-elev); padding: 44px;
}
@media (max-width: 600px) { .form-wrap { padding: 28px 22px; } }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.field { display: flex; flex-direction: column; gap: 7px; }
.field.full { grid-column: 1 / -1; }
@media (max-width: 600px) { .form-grid { grid-template-columns: 1fr; } .field { grid-column: 1 / -1; } }
.field label { font-size: 14px; font-weight: 600; color: var(--text-soft); }
.field label .req { color: var(--accent-soft); }
.field input, .field select {
  width: 100%; padding: 13px 15px; font-size: 15px; font-family: inherit;
  color: var(--text); background: var(--bg-card-solid);
  border: 1px solid var(--border-strong); border-radius: 11px;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.field input::placeholder { color: var(--text-dim); }
.field input:focus, .field select:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(124, 92, 255, 0.18);
}
.field .error-msg { font-size: 12.5px; color: #ff8089; display: none; }
.field.invalid input, .field.invalid select { border-color: #ff5a67; }
.field.invalid .error-msg { display: block; }

/* checkbox group for models */
.check-group { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
@media (max-width: 520px) { .check-group { grid-template-columns: 1fr 1fr; } }
.check {
  display: flex; align-items: center; gap: 9px; cursor: pointer; user-select: none;
  padding: 11px 13px; border: 1px solid var(--border-strong); border-radius: 11px;
  background: var(--bg-card-solid); font-size: 14px; transition: border-color 0.2s, background 0.2s;
}
.check:hover { border-color: var(--accent); }
.check input { accent-color: var(--accent); width: 16px; height: 16px; }
.check.checked { border-color: var(--accent); background: rgba(124,92,255,0.1); }

.form-submit { margin-top: 26px; }
.form-submit .btn { width: 100%; }
.form-note { margin-top: 14px; font-size: 13px; color: var(--text-dim); text-align: center; }

/* success state */
.form-success {
  display: none; text-align: center; padding: 30px 10px;
}
.form-success.show { display: block; }
.form-success .check-circle {
  width: 64px; height: 64px; border-radius: 50%; margin: 0 auto 20px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--grad-1), var(--grad-3));
  box-shadow: var(--glow);
}
.form-success .check-circle svg { width: 32px; height: 32px; color: #fff; }
.form-success h3 { font-size: 24px; margin-bottom: 10px; }
.form-success p { color: var(--text-soft); }

.todo-banner {
  max-width: 640px; margin: 22px auto 0; text-align: center;
  font-size: 13px; color: var(--text-dim);
  border: 1px dashed var(--border-strong); border-radius: 12px; padding: 12px 16px;
}

/* ----------------------------------- scroll reveal ------------------------- */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}