/* ===== BBTECHHOUSE — Design System ===== */
:root {
  --bg-0: #04060f;
  --bg-1: #070b1c;
  --bg-2: #0b1130;
  --surface: rgba(255,255,255,0.04);
  --surface-2: rgba(255,255,255,0.06);
  --stroke: rgba(255,255,255,0.08);
  --stroke-2: rgba(255,255,255,0.14);
  --fg: #f1f4ff;
  --fg-2: #c5cbe3;
  --fg-3: #8990b5;
  --fg-4: #5e6588;
  --accent-blue: #4f8bff;
  --accent-purple: #a370ff;
  --accent-cyan: #34dcff;
  --accent-pink: #ff6fb7;
  --grad-primary: linear-gradient(135deg, #4f8bff 0%, #a370ff 50%, #34dcff 100%);
  --grad-warm: linear-gradient(135deg, #a370ff 0%, #ff6fb7 100%);
  --grad-soft: linear-gradient(135deg, rgba(79,139,255,.16), rgba(163,112,255,.16) 50%, rgba(52,220,255,.16));
  --radius-sm: 10px;
  --radius: 16px;
  --radius-lg: 22px;
  --shadow-glow: 0 0 0 1px rgba(255,255,255,.06), 0 30px 60px -20px rgba(79,139,255,.35), 0 0 120px -30px rgba(163,112,255,.4);
}

[data-theme="light"] {
  --bg-0: #f5f6fb;
  --bg-1: #ffffff;
  --bg-2: #eef0f9;
  --surface: rgba(13,18,40,0.03);
  --surface-2: rgba(13,18,40,0.05);
  --stroke: rgba(13,18,40,0.08);
  --stroke-2: rgba(13,18,40,0.14);
  --fg: #0b1130;
  --fg-2: #2c3460;
  --fg-3: #555c82;
  --fg-4: #8a90b0;
}

* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0;
  background: var(--bg-0);
  color: var(--fg);
  font-family: 'Manrope', system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  font-feature-settings: 'ss01','cv11';
}
body {
  min-height: 100vh;
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(79,139,255,.18), transparent 60%),
    radial-gradient(900px 700px at 110% 10%, rgba(163,112,255,.18), transparent 55%),
    radial-gradient(800px 500px at 50% 110%, rgba(52,220,255,.10), transparent 60%),
    var(--bg-0);
  background-attachment: fixed;
}
[data-theme="light"] body {
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(79,139,255,.10), transparent 60%),
    radial-gradient(900px 700px at 110% 10%, rgba(163,112,255,.08), transparent 55%),
    var(--bg-0);
}

h1,h2,h3,h4,h5 { font-family: 'Space Grotesk', sans-serif; letter-spacing: -0.02em; margin: 0; color: var(--fg); }
p { margin: 0; color: var(--fg-2); line-height: 1.6; }
a { color: inherit; text-decoration: none; }
.mono { font-family: 'JetBrains Mono', monospace; }

.container { max-width: 1280px; margin: 0 auto; padding: 0 24px; }
.section { padding: 96px 0; position: relative; }
@media (max-width: 720px){ .section { padding: 64px 0; } }

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 20px; border-radius: 999px;
  font-weight: 600; font-size: 14px;
  border: 1px solid transparent; cursor: pointer; transition: transform .15s ease, box-shadow .25s ease, background .25s ease, opacity .2s;
  font-family: inherit; color: var(--fg);
}
.btn:hover { transform: translateY(-1px); }
.btn-primary {
  background: var(--grad-primary); color: white;
  box-shadow: 0 10px 30px -10px rgba(79,139,255,.6), inset 0 0 0 1px rgba(255,255,255,.18);
}
.btn-primary:hover { box-shadow: 0 14px 40px -10px rgba(163,112,255,.7), inset 0 0 0 1px rgba(255,255,255,.25); }
.btn-ghost { background: var(--surface); border-color: var(--stroke-2); color: var(--fg); backdrop-filter: blur(20px); }
.btn-ghost:hover { background: var(--surface-2); }

/* ===== Glass card ===== */
.glass {
  background: var(--surface);
  border: 1px solid var(--stroke);
  border-radius: var(--radius);
  backdrop-filter: blur(20px);
  position: relative;
}
.glass-strong {
  background: linear-gradient(180deg, rgba(255,255,255,.05), rgba(255,255,255,.02));
  border: 1px solid var(--stroke-2);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(24px);
}
[data-theme="light"] .glass-strong { background: linear-gradient(180deg, rgba(255,255,255,1), rgba(255,255,255,.6)); }

.glow-hover { transition: transform .2s, box-shadow .35s, border-color .2s; }
.glow-hover:hover { transform: translateY(-3px); border-color: var(--stroke-2); box-shadow: 0 22px 50px -20px rgba(79,139,255,.4), 0 0 0 1px rgba(163,112,255,.25); }

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

.chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 12px; border-radius: 999px;
  background: var(--surface); border: 1px solid var(--stroke);
  font-size: 12px; font-weight: 500; color: var(--fg-2);
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: .02em;
}
.chip-dot { width: 6px; height: 6px; border-radius: 999px; background: var(--accent-cyan); box-shadow: 0 0 12px var(--accent-cyan); }
.chip-grad { background: var(--grad-soft); color: var(--fg); border-color: var(--stroke-2); }

/* ===== Nav ===== */
.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(20px);
  background: color-mix(in srgb, var(--bg-0) 70%, transparent);
  border-bottom: 1px solid var(--stroke);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; padding: 16px 24px; max-width: 1440px; margin: 0 auto; gap: 24px; }
.nav-logo { display: flex; align-items: center; gap: 10px; font-family: 'Space Grotesk', sans-serif; font-weight: 700; font-size: 18px; letter-spacing: -0.02em; }
.nav-logo-mark {
  width: 32px; height: 32px; border-radius: 9px;
  background: var(--grad-primary);
  display: grid; place-items: center;
  box-shadow: 0 8px 24px -8px rgba(163,112,255,.6);
  position: relative; overflow: hidden;
}
.nav-logo-mark::after {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(circle at 30% 30%, rgba(255,255,255,.4), transparent 50%);
}
.nav-links { display: flex; gap: 4px; align-items: center; }
.nav-link {
  padding: 8px 14px; border-radius: 999px;
  font-size: 14px; color: var(--fg-2); cursor: pointer;
  font-weight: 500;
  transition: background .15s, color .15s;
  display: inline-flex; align-items: center; gap: 4px;
}
.nav-link:hover { color: var(--fg); background: var(--surface); }
.nav-link.active { color: var(--fg); background: var(--surface); }
.nav-right { display: flex; gap: 8px; align-items: center; }
.theme-toggle {
  width: 36px; height: 36px; border-radius: 999px;
  border: 1px solid var(--stroke); background: var(--surface);
  display: grid; place-items: center; cursor: pointer; color: var(--fg-2);
}
.theme-toggle:hover { color: var(--fg); border-color: var(--stroke-2); }

/* Mega menu */
.mega {
  position: absolute; top: calc(100% + 8px); left: 50%; transform: translateX(-50%) translateY(-4px);
  width: min(960px, 92vw);
  background: var(--bg-1);
  border: 1px solid var(--stroke-2);
  border-radius: 22px;
  padding: 24px;
  display: none;
  box-shadow: 0 40px 80px -30px rgba(0,0,0,.5), 0 0 0 1px var(--stroke);
  z-index: 60;
}
.nav-link.has-mega { position: relative; }
.nav-link.has-mega:hover + .mega, .mega:hover { display: grid; }
.mega-grid { display: grid; grid-template-columns: 1.1fr 1fr 1fr; gap: 20px; }
.mega-feat { background: var(--grad-soft); border: 1px solid var(--stroke-2); border-radius: 16px; padding: 18px; display: flex; flex-direction: column; gap: 8px; }

/* ===== Hero glow grid backdrop ===== */
.grid-bg {
  position: absolute; inset: 0; overflow: hidden; pointer-events: none;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
}
.grid-bg::before {
  content: ''; position: absolute; inset: -2px;
  background-image:
    linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px);
  background-size: 56px 56px;
}
[data-theme="light"] .grid-bg::before { background-image:
  linear-gradient(rgba(13,18,40,.05) 1px, transparent 1px),
  linear-gradient(90deg, rgba(13,18,40,.05) 1px, transparent 1px); }

/* particles */
.particles { position: absolute; inset: 0; overflow: hidden; pointer-events: none; }
.particle { position: absolute; width: 4px; height: 4px; border-radius: 999px; background: var(--accent-cyan); opacity: .5; filter: blur(1px); animation: float 14s linear infinite; }
@keyframes float { 0% { transform: translateY(120vh) translateX(0); opacity: 0; } 10% { opacity: .6; } 90% { opacity: .6; } 100% { transform: translateY(-20vh) translateX(40px); opacity: 0; } }

/* ===== Footer ===== */
footer { padding: 80px 0 40px; border-top: 1px solid var(--stroke); margin-top: 80px; }
.footer-grid { display: grid; grid-template-columns: 1.5fr repeat(4, 1fr); gap: 40px; }
@media (max-width: 880px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
.footer-col h5 { font-size: 13px; text-transform: uppercase; letter-spacing: .1em; color: var(--fg-3); margin-bottom: 16px; font-weight: 600; }
.footer-col a { display: block; padding: 6px 0; color: var(--fg-2); font-size: 14px; }
.footer-col a:hover { color: var(--fg); }
.footer-bottom { display: flex; justify-content: space-between; align-items: center; padding-top: 40px; margin-top: 40px; border-top: 1px solid var(--stroke); color: var(--fg-3); font-size: 13px; }

/* utility */
.flex { display: flex; }
.grid { display: grid; }
.hide-sm { }
@media (max-width: 880px) { .hide-sm { display: none !important; } }

.divider { height: 1px; background: var(--stroke); margin: 24px 0; }

/* Marquee */
.marquee { display: flex; gap: 56px; overflow: hidden; mask-image: linear-gradient(90deg, transparent, black 10%, black 90%, transparent); }
.marquee-track { display: flex; gap: 56px; animation: marq 35s linear infinite; flex-shrink: 0; align-items: center; }
@keyframes marq { to { transform: translateX(-50%); } }
.partner-logo { font-family: 'Space Grotesk', sans-serif; font-weight: 600; font-size: 22px; color: var(--fg-3); opacity: .8; white-space: nowrap; letter-spacing: -.02em; }
.partner-logo:hover { color: var(--fg); }

/* Animated counter / fade-in */
.fade-up { opacity: 0; transform: translateY(20px); transition: opacity .8s ease, transform .8s ease; }
.fade-up.in { opacity: 1; transform: translateY(0); }

/* Accordion */
.acc-item { border: 1px solid var(--stroke); border-radius: 14px; background: var(--surface); margin-bottom: 10px; overflow: hidden; transition: border-color .2s; }
.acc-item.open { border-color: var(--stroke-2); }
.acc-head { width: 100%; text-align: left; padding: 18px 20px; background: transparent; border: 0; color: var(--fg); font-family: inherit; font-size: 16px; font-weight: 600; cursor: pointer; display: flex; justify-content: space-between; align-items: center; gap: 16px; }
.acc-body { max-height: 0; overflow: hidden; transition: max-height .35s ease, padding .25s ease; padding: 0 20px; }
.acc-item.open .acc-body { max-height: 1200px; padding: 0 20px 20px; }
.acc-icon { width: 26px; height: 26px; border-radius: 8px; background: var(--surface); border: 1px solid var(--stroke-2); display: grid; place-items: center; transition: transform .25s, background .25s; flex-shrink: 0; }
.acc-item.open .acc-icon { background: var(--grad-primary); border-color: transparent; transform: rotate(45deg); }

/* progress ring */
.ring-bg { stroke: var(--stroke-2); }
.ring-fg { stroke: url(#grad-stroke); stroke-linecap: round; transition: stroke-dashoffset .8s ease; }

/* table */
.tbl { width: 100%; border-collapse: collapse; }
.tbl th, .tbl td { text-align: left; padding: 14px 16px; font-size: 14px; border-bottom: 1px solid var(--stroke); }
.tbl th { color: var(--fg-3); font-weight: 500; font-size: 12px; text-transform: uppercase; letter-spacing: .08em; }
.tbl tr:hover td { background: var(--surface); }

/* badges */
.badge { display: inline-flex; align-items: center; gap: 4px; padding: 3px 10px; border-radius: 999px; font-size: 11px; font-weight: 600; font-family: 'JetBrains Mono', monospace; letter-spacing: .02em; }
.badge-success { background: rgba(52,220,255,.12); color: var(--accent-cyan); border: 1px solid rgba(52,220,255,.3); }
.badge-warn { background: rgba(255,111,183,.12); color: var(--accent-pink); border: 1px solid rgba(255,111,183,.3); }
.badge-info { background: rgba(163,112,255,.14); color: var(--accent-purple); border: 1px solid rgba(163,112,255,.3); }

/* Section heading kit */
.eyebrow { font-family: 'JetBrains Mono', monospace; font-size: 12px; letter-spacing: .15em; text-transform: uppercase; color: var(--accent-cyan); margin-bottom: 14px; display: inline-flex; align-items: center; gap: 8px; }
.eyebrow::before { content: ''; width: 24px; height: 1px; background: var(--accent-cyan); }
.h-display { font-size: clamp(36px, 5vw, 64px); font-weight: 700; line-height: 1.04; letter-spacing: -0.03em; }
.h-section { font-size: clamp(28px, 3.4vw, 46px); font-weight: 700; line-height: 1.08; letter-spacing: -0.025em; }
.lede { font-size: clamp(16px, 1.2vw, 18px); color: var(--fg-2); max-width: 60ch; }

/* mobile nav */
.mob-toggle { display: none; width: 38px; height: 38px; border-radius: 10px; background: var(--surface); border: 1px solid var(--stroke); align-items: center; justify-content: center; cursor: pointer; color: var(--fg); }
@media (max-width: 1024px){
  .nav-links { display: none; }
  .mob-toggle { display: inline-flex; }
  .mega { display: none !important; }
}