/* Build4future.AI — dynamic, AI-forward aesthetic
   Deep-ink canvas, electric accent, animated gradients, real imagery, bold type
*/
:root {
  /* Core palette */
  --bg: #0A0B0F;
  --bg-2: #10121A;
  --surface: #14161F;
  --surface-2: #1A1D28;
  --ink: #F5F6FA;
  --ink-2: #D6D9E3;
  --ink-mute: #8A90A0;
  --ink-subtle: #5A6070;
  --line: rgba(255,255,255,0.08);
  --line-2: rgba(255,255,255,0.14);

  /* Accent spectrum — Blue → Turquoise */
  --accent: #2DD4BF;      /* turquoise */
  --accent-2: #22D3EE;    /* cyan */
  --accent-3: #3B82F6;    /* blue */
  --accent-4: #0EA5E9;    /* sky */
  --accent-soft: rgba(45,212,191,0.18);
  --accent-blue: #3B82F6;

  /* Gradients — unified blue→turquoise spectrum */
  --grad-brand: linear-gradient(135deg, #3B82F6 0%, #22D3EE 50%, #2DD4BF 100%);
  --grad-hero: conic-gradient(from 210deg at 50% 50%, #3B82F6 0%, #22D3EE 35%, #2DD4BF 70%, #3B82F6 100%);
  --grad-mesh: radial-gradient(ellipse 80% 60% at 20% 10%, rgba(59,130,246,0.30), transparent 60%),
               radial-gradient(ellipse 70% 50% at 80% 30%, rgba(34,211,238,0.22), transparent 60%),
               radial-gradient(ellipse 60% 60% at 50% 90%, rgba(45,212,191,0.22), transparent 60%);

  /* Radii / shadows */
  --r-sm: 8px; --r-md: 14px; --r-lg: 20px; --r-xl: 28px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.35), 0 0 0 1px rgba(255,255,255,0.04);
  --shadow-md: 0 10px 30px rgba(0,0,0,0.45), 0 0 0 1px rgba(255,255,255,0.06);
  --shadow-glow: 0 0 60px rgba(124,107,255,0.35), 0 0 0 1px rgba(124,107,255,0.35);

  /* Type */
  --sans: 'Inter', system-ui, -apple-system, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, monospace;
  --display: 'Instrument Serif', Georgia, serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  font-size: 16px;
  line-height: 1.55;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.container { max-width: 1440px; margin: 0 auto; padding: 0 48px; }
@media (min-width: 1600px) { .container { max-width: 1520px; padding: 0 64px; } }
@media (max-width: 1100px) { .container { padding: 0 32px; } }
@media (max-width: 700px) { .container { padding: 0 20px; } }

/* ==== NAV ==== */
.nav-wrap {
  position: fixed; top: 20px; left: 0; right: 0; z-index: 100;
  display: flex; justify-content: center; pointer-events: none;
}
.nav {
  pointer-events: auto;
  display: flex; align-items: center; gap: 6px;
  background: rgba(20,22,31,0.72);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border: 1px solid var(--line-2);
  border-radius: 999px;
  padding: 6px 6px 6px 20px;
  box-shadow: 0 20px 40px -20px rgba(0,0,0,0.6);
}
.brand { display: flex; align-items: center; gap: 10px; margin-right: 20px; font-weight: 600; letter-spacing: -0.015em; font-size: 15.5px; }
.brand-mark {
  width: 26px; height: 26px; border-radius: 8px;
  flex-shrink: 0;
  box-shadow: 0 0 18px rgba(34,211,238,0.35);
}
.brand-word { display: inline-flex; align-items: baseline; color: var(--ink); }
.brand-word .bw-4 {
  font-family: var(--display); font-style: italic; font-weight: 400;
  background: linear-gradient(135deg, #60A5FA, #22D3EE 55%, #2DD4BF);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  margin: 0 -0.02em; font-size: 1.05em;
}
.brand-word .bw-dot { color: var(--accent-2); font-weight: 500; margin-left: 1px; }
.nav-links { display: flex; gap: 2px; }
.nav-links a {
  padding: 8px 14px; border-radius: 999px; font-size: 13.5px; color: var(--ink-2);
  transition: color .2s, background .2s;
}
.nav-links a:hover { color: var(--ink); background: rgba(255,255,255,0.05); }
.nav-links a.active { color: var(--ink); background: rgba(255,255,255,0.08); }
.nav-cta {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 9px 18px; border-radius: 999px; font-size: 13.5px; font-weight: 500;
  background: var(--ink); color: var(--bg);
  transition: transform .2s, box-shadow .2s;
}
.nav-cta:hover { transform: translateY(-1px); box-shadow: 0 8px 20px rgba(255,255,255,0.15); }
.nav-toggle { display: none; background: none; border: 0; color: var(--ink); }
@media (max-width: 900px) {
  .nav-links, .nav-cta { display: none; }
  .nav-toggle { display: grid; place-items: center; padding: 10px; }
  .nav { padding: 8px 8px 8px 18px; }
}

/* ==== TYPOGRAPHY ==== */
.display-xl { font-size: clamp(44px, 6.8vw, 108px); font-weight: 500; letter-spacing: -0.035em; line-height: 0.96; margin: 0; font-family: var(--sans); }
.display-lg { font-size: clamp(34px, 4.5vw, 64px); font-weight: 500; letter-spacing: -0.03em; line-height: 1.02; margin: 0; }
.display-md { font-size: clamp(28px, 3.5vw, 44px); font-weight: 500; letter-spacing: -0.025em; line-height: 1.1; margin: 0; }
.serif-accent { font-family: var(--display); font-weight: 400; font-style: italic; letter-spacing: -0.02em; }
.grad-text {
  background: linear-gradient(120deg, #F5F6FA 10%, #3B82F6 40%, #22D3EE 65%, #2DD4BF 95%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  background-size: 200% 200%;
  animation: gradShift 8s ease-in-out infinite;
}
@keyframes gradShift { 0%,100% { background-position: 0% 50%; } 50% { background-position: 100% 50%; } }

.lead { font-size: clamp(17px, 1.4vw, 20px); color: var(--ink-2); line-height: 1.55; max-width: 60ch; }

.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--mono); font-size: 11.5px; font-weight: 500;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink-mute);
  padding: 6px 12px; border: 1px solid var(--line-2);
  border-radius: 999px; background: rgba(255,255,255,0.02);
}
.eyebrow .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent-2); box-shadow: 0 0 10px var(--accent-2); animation: pulse 2s ease infinite; }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.4; } }

/* ==== BUTTONS ==== */
.btn {
  display: inline-flex; align-items: center; gap: 10px; padding: 13px 22px;
  border-radius: 999px; font-size: 14px; font-weight: 500; cursor: pointer;
  transition: transform .2s, box-shadow .25s, background .2s, color .2s;
  border: 1px solid transparent; line-height: 1; white-space: nowrap;
}
.btn-lg { padding: 15px 26px; font-size: 15px; }
.btn-primary { background: var(--ink); color: var(--bg); }
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 10px 30px rgba(255,255,255,0.15); }
.btn-accent { background: var(--grad-brand); color: #0A1520; font-weight: 600; }
.btn-accent:hover { transform: translateY(-1px); box-shadow: 0 10px 30px rgba(34,211,238,0.45); filter: brightness(1.08); }
.sec-num {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em;
  background: linear-gradient(135deg, #60A5FA, #22D3EE);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  font-weight: 600;
}
.btn-ghost { background: rgba(255,255,255,0.04); color: var(--ink); border-color: var(--line-2); }
.btn-ghost:hover { background: rgba(255,255,255,0.08); border-color: var(--line-2); }
.arrow { transition: transform .25s; }
.btn:hover .arrow { transform: translateX(4px); }

.flex-row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }

/* ==== PAGE HERO GENERIC ==== */
.page-hero {
  position: relative; overflow: hidden;
  padding: 150px 0 80px;
  background: var(--bg);
}
.page-hero::before {
  content: ''; position: absolute; inset: 0;
  background: var(--grad-mesh);
  opacity: 0.9; pointer-events: none;
}
.page-hero::after {
  content: ''; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.035) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse at 50% 40%, #000 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 40%, #000 30%, transparent 80%);
  pointer-events: none;
}
.page-hero .inner { position: relative; z-index: 2; text-align: center; }
.page-hero h1 { margin: 20px auto 24px; max-width: 20ch; }
.page-hero p.lead { margin: 0 auto 36px; }

/* Cinematic header image band — sits below page-hero text, before content */
.hero-image-band {
  position: relative; z-index: 2;
  margin: 64px auto 0;
  width: min(1200px, calc(100% - 48px));
  aspect-ratio: 21 / 8;
  border-radius: 24px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: 0 40px 80px -40px rgba(0,0,0,0.6), 0 0 0 1px rgba(255,255,255,0.04) inset;
}
.hero-image-band > img,
.hero-image-band > picture > img {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover; display: block;
  transition: transform .8s cubic-bezier(.2,.7,.2,1);
}
.hero-image-band:hover > img,
.hero-image-band:hover > picture > img { transform: scale(1.03); }
.hero-image-band::after {
  content: ''; position: absolute; inset: 0;
  background:
    linear-gradient(180deg, rgba(10,11,15,0) 30%, rgba(10,11,15,0.55) 100%),
    linear-gradient(120deg, rgba(34,211,238,0.18) 0%, rgba(34,211,238,0) 40%, rgba(45,212,191,0) 60%, rgba(59,130,246,0.22) 100%);
  pointer-events: none;
}
.hero-image-band .caption {
  position: absolute; left: 28px; right: 28px; bottom: 22px;
  display: flex; align-items: center; gap: 14px;
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em;
  text-transform: uppercase; color: rgba(255,255,255,0.85);
  z-index: 2;
}
.hero-image-band .caption .pill {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 12px; border-radius: 999px;
  background: rgba(10,11,15,0.55); border: 1px solid rgba(255,255,255,0.14);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}
.hero-image-band .caption .pill::before {
  content: ''; width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent-2); box-shadow: 0 0 10px var(--accent-2);
}
@media (max-width: 720px) {
  .hero-image-band { aspect-ratio: 4/3; margin-top: 40px; border-radius: 18px; }
  .hero-image-band .caption { left: 16px; right: 16px; bottom: 14px; font-size: 10px; }
}

.breadcrumbs { display: inline-flex; gap: 8px; align-items: center; font-family: var(--mono); font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-mute); margin-bottom: 14px; }
.breadcrumbs a:hover { color: var(--ink); }
.breadcrumbs .sep { opacity: 0.4; }

/* ==== SECTION ==== */
.section { padding: clamp(96px, 11vw, 160px) 0; position: relative; }
.section-head { display: grid; grid-template-columns: auto 1fr; gap: 40px; align-items: end; margin-bottom: 56px; }
.section-head h2 { max-width: 22ch; }
@media (max-width: 800px) { .section-head { grid-template-columns: 1fr; gap: 16px; } }

/* ==== CARDS ==== */
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 28px;
  transition: border-color .25s, transform .25s, background .25s;
  position: relative; overflow: hidden;
}
.card:hover { border-color: var(--line-2); background: var(--surface-2); }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
@media (max-width: 1000px) { .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } }

/* ==== FOOTER ==== */
.site-footer {
  background: var(--bg-2);
  border-top: 1px solid var(--line);
  padding: 80px 0 40px;
  margin-top: 80px;
  position: relative; overflow: hidden;
}
.site-footer::before {
  content: ''; position: absolute; inset: 0;
  background: var(--grad-mesh); opacity: 0.3; pointer-events: none;
}
.footer-wrap { position: relative; display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 56px; }
@media (max-width: 900px) { .footer-wrap { grid-template-columns: 1fr 1fr; } }
@media (max-width: 540px) { .footer-wrap { grid-template-columns: 1fr; } }
.site-footer .brand { font-size: 18px; }
.site-footer p.tag { color: var(--ink-mute); margin: 20px 0 0; max-width: 32ch; font-size: 14px; }
.site-footer h5 { font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em; color: var(--ink-mute); text-transform: uppercase; margin: 0 0 16px; font-weight: 500; }
.site-footer a.fl { display: block; font-size: 14px; color: var(--ink-2); padding: 6px 0; transition: color .2s; }
.site-footer a.fl:hover { color: var(--ink); }
.footer-bottom { position: relative; border-top: 1px solid var(--line); padding-top: 24px; display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-family: var(--mono); font-size: 11px; letter-spacing: 0.1em; color: var(--ink-mute); text-transform: uppercase; }
.footer-bottom .footer-legal a { color: var(--ink-mute); transition: color .2s; }
.footer-bottom .footer-legal a:hover { color: var(--ink); }
.footer-bottom .footer-legal .dot-sep { opacity: 0.4; margin: 0 8px; }

/* ==== REVEAL ==== */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .8s ease, transform .8s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ==== UTIL ==== */
.mono { font-family: var(--mono); }
.muted { color: var(--ink-mute); }
.chip-tag {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 11px; border-radius: 999px;
  background: rgba(59,130,246,0.14); color: #93C5FD;
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase;
}

/* hero-specific helpers used on home */
.orbital-ring {
  position: absolute; inset: 0; pointer-events: none;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,0.06);
}