/* ==========================================================================
   EntAIFab — Enterprise AI Fabric marketing site
   ========================================================================== */

:root{
  --bg: #05070d;
  --bg-alt: #080c16;
  --surface: rgba(255,255,255,0.035);
  --surface-strong: rgba(255,255,255,0.06);
  --border: rgba(255,255,255,0.09);
  --border-strong: rgba(255,255,255,0.16);

  --text-primary: #f3f6fb;
  --text-secondary: #9fb0c7;
  --text-tertiary: #64748b;

  --blue-300: #7dd3fc;
  --blue-400: #60a5fa;
  --blue-500: #3b82f6;
  --blue-600: #2563eb;
  --cyan-400: #22d3ee;
  --indigo-400: #818cf8;

  --gradient-primary: linear-gradient(135deg, var(--blue-600), var(--cyan-400));
  --gradient-text: linear-gradient(120deg, #ffffff 0%, var(--blue-300) 45%, var(--cyan-400) 100%);

  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;

  --shadow-glow: 0 0 0 1px rgba(96,165,250,0.12), 0 20px 60px -20px rgba(37,99,235,0.35);
  --container-w: 1240px;

  font-size: 16px;
}

*, *::before, *::after{ box-sizing: border-box; }

html{ scroll-behavior: smooth; }

body{
  margin:0;
  background: var(--bg);
  color: var(--text-primary);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1,h2,h3,h4{
  font-family: "Space Grotesk", "Inter", sans-serif;
  line-height: 1.15;
  margin: 0 0 16px;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

p{ margin: 0 0 16px; color: var(--text-secondary); }
a{ color: inherit; text-decoration: none; }
ul{ margin:0; padding:0; list-style:none; }
svg{ display:block; }
button{ font-family: inherit; }

.container{
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 32px;
}

/* ---------------- Background decoration ---------------- */
.bg-grid{
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  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 80% 60% at 50% 0%, #000 10%, transparent 75%);
}

.bg-glow{
  position: fixed; z-index: 0; pointer-events: none; border-radius: 50%;
  filter: blur(110px); opacity: 0.35;
}
.bg-glow--1{ width: 640px; height: 640px; top: -220px; left: -160px; background: radial-gradient(circle, var(--blue-600), transparent 70%); }
.bg-glow--2{ width: 560px; height: 560px; top: 40vh; right: -220px; background: radial-gradient(circle, var(--cyan-400), transparent 70%); opacity: 0.18; }
.bg-glow--3{ width: 700px; height: 700px; bottom: -260px; left: 20%; background: radial-gradient(circle, var(--indigo-400), transparent 70%); opacity: 0.16; }

main, header, footer{ position: relative; z-index: 1; }

/* ---------------- Buttons ---------------- */
.btn{
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px 22px; border-radius: 999px; font-weight: 600; font-size: 0.92rem;
  border: 1px solid transparent; cursor: pointer; white-space: nowrap;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease, border-color .18s ease;
}
.btn-lg{ padding: 14px 28px; font-size: 0.98rem; }
.btn-primary{
  background: var(--gradient-primary); color: #04101f;
  box-shadow: 0 8px 30px -8px rgba(59,130,246,0.6);
}
.btn-primary:hover{ transform: translateY(-1px); box-shadow: 0 12px 34px -6px rgba(59,130,246,0.75); }
.btn-outline{ background: transparent; border-color: var(--border-strong); color: var(--text-primary); }
.btn-outline:hover{ border-color: var(--blue-400); background: rgba(96,165,250,0.08); }
.btn-ghost{ background: transparent; color: var(--text-secondary); }
.btn-ghost:hover{ color: var(--text-primary); }

/* ---------------- Header / Nav ---------------- */
.site-header{
  position: sticky; top: 0; z-index: 50;
  border-bottom: 1px solid transparent;
  transition: background .25s ease, border-color .25s ease, backdrop-filter .25s ease;
}
.site-header.is-scrolled{
  background: rgba(5,7,13,0.72);
  backdrop-filter: blur(16px) saturate(140%);
  border-bottom-color: var(--border);
}
.nav-inner{
  display: flex; align-items: center; justify-content: space-between;
  height: 76px; gap: 24px;
}
.brand{ display: flex; align-items: center; }
.brand-logo{ height: 40px; width: auto; display: block; }

.nav-links{ display:flex; align-items:center; gap: 30px; }
.nav-links a{ font-size: 0.92rem; color: var(--text-secondary); font-weight: 500; transition: color .15s ease; position:relative; }
.nav-links a:hover{ color: var(--text-primary); }

.nav-cta{ display:flex; align-items:center; gap: 10px; }
.nav-toggle{ display:none; flex-direction:column; gap:5px; background:none; border:none; padding:8px; cursor:pointer; }
.nav-toggle span{ width: 22px; height: 2px; background: var(--text-primary); border-radius: 2px; }

/* ---------------- Hero ---------------- */
.hero{
  position: relative; padding: 96px 0 88px; overflow: hidden;
}
.hero-canvas{ position: absolute; inset: 0; width: 100%; height: 100%; opacity: 0.55; }
.hero-inner{
  position: relative; display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 56px; align-items: center;
}

.eyebrow{
  display: inline-flex; align-items:center; gap: 8px;
  font-size: 0.78rem; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--blue-300); background: rgba(96,165,250,0.1); border: 1px solid rgba(96,165,250,0.25);
  padding: 7px 14px; border-radius: 999px; margin-bottom: 22px;
}
.eyebrow .dot{ width:6px; height:6px; border-radius:50%; background: var(--cyan-400); box-shadow: 0 0 10px 2px var(--cyan-400); }
.eyebrow--muted{ color: var(--text-secondary); background: var(--surface); border-color: var(--border); }

.hero-copy h1{ font-size: clamp(2.4rem, 4.2vw, 3.6rem); margin-bottom: 20px; }
.text-gradient{
  background: var(--gradient-text); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-lead{ font-size: 1.12rem; max-width: 560px; color: var(--text-secondary); }
.hero-actions{ display:flex; gap: 14px; margin: 30px 0 34px; flex-wrap: wrap; }

/* glass panel base */
.glass-panel{
  background: linear-gradient(160deg, rgba(255,255,255,0.055), rgba(255,255,255,0.015));
  border: 1px solid var(--border); border-radius: var(--radius-lg);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow-glow);
}

.hero-panel{ padding: 6px; }
.panel-head{ display:flex; align-items:center; gap:7px; padding: 14px 18px; border-bottom: 1px solid var(--border); }
.panel-dot{ width:9px; height:9px; border-radius:50%; background: rgba(255,255,255,0.14); }
.panel-title{ margin-left: 8px; font-size: 0.78rem; color: var(--text-tertiary); font-weight:600; letter-spacing: 0.02em; }
.panel-body{ padding: 26px 22px 22px; }

.hub-diagram{ position: relative; height: 258px; }

.hub-lines{ position:absolute; inset:0; width:100%; height:100%; z-index:1; }
.hub-line{ fill:none; stroke: url(#hubLineGrad); stroke-width: 1.1; stroke-dasharray: 3.5 4.5; opacity: 0.4; animation: hubDash 3.2s linear infinite; vector-effect: non-scaling-stroke; }
.hub-line--accent{ opacity: 0.6; }
.hub-pulse{ fill: #7dd3fc; opacity: 0.85; filter: blur(0.4px) drop-shadow(0 0 4px rgba(125,211,252,0.95)); }
.hub-pulse--accent{ fill: #22d3ee; filter: blur(0.4px) drop-shadow(0 0 4px rgba(34,211,238,0.95)); }
@keyframes hubDash{ to{ stroke-dashoffset: -80; } }

.hub-node--center{
  position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%);
  z-index: 3; display:flex; flex-direction:column; align-items:center; justify-content:center;
  width: 96px; height: 96px; border-radius: 50%; text-align: center;
  background: radial-gradient(circle at 35% 30%, rgba(96,165,250,0.28), rgba(15,23,42,0.75));
  border: 1px solid rgba(125,211,252,0.45);
  box-shadow: 0 0 40px 6px rgba(59,130,246,0.35), inset 0 0 20px rgba(125,211,252,0.15);
  font-family: "Space Grotesk", sans-serif; font-size: 0.86rem; font-weight: 700; color: var(--blue-300);
  animation: pulseGlow 3.2s ease-in-out infinite;
}
.hub-node--sm{
  position:absolute; z-index:2; display:inline-flex; align-items:center; gap: 6px; transform: translateY(-50%);
  font-size: 0.66rem; font-weight:600; color: var(--text-secondary);
  background: rgba(10,15,26,0.75); backdrop-filter: blur(6px); border:1px solid var(--border); border-radius: 999px;
  padding: 6px 12px; white-space:nowrap;
}
.hub-node--accent{ color: var(--cyan-400); border-color: rgba(34,211,238,0.35); background: rgba(11,30,34,0.75); }
.hub-dot{ width:5px; height:5px; border-radius:50%; background: var(--blue-400); box-shadow: 0 0 6px 1px var(--blue-400); flex: none; }
.hub-node--accent .hub-dot{ background: var(--cyan-400); box-shadow: 0 0 6px 1px var(--cyan-400); }

@keyframes pulseGlow{
  0%,100%{ box-shadow: 0 0 40px 6px rgba(59,130,246,0.35), inset 0 0 20px rgba(125,211,252,0.15); }
  50%{ box-shadow: 0 0 56px 12px rgba(59,130,246,0.5), inset 0 0 26px rgba(125,211,252,0.25); }
}

.panel-stats{ display:grid; grid-template-columns: repeat(3,1fr); gap: 10px; margin-top: 22px; padding-top: 20px; border-top: 1px solid var(--border); }
.panel-stats div{ text-align:center; }
.panel-stats strong{ display:block; font-family:"Space Grotesk"; font-size:1.3rem; color: var(--text-primary); }
.panel-stats span{ font-size: 0.68rem; color: var(--text-tertiary); }

/* ---------------- Sections (shared) ---------------- */
.section{ padding: 108px 0; }
.section--alt{ background: linear-gradient(180deg, transparent, rgba(255,255,255,0.012) 12%, rgba(255,255,255,0.012) 88%, transparent); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }

.section-head{ max-width: 700px; margin: 0 auto 56px; text-align: center; }
.section-head h2{ font-size: clamp(1.7rem, 3vw, 2.4rem); }
.section-sub{ font-size: 1.02rem; color: var(--text-secondary); }
.section-head .section-sub{ margin: 0 auto; }

.grid{ display:grid; gap: 22px; }
.grid-3{ grid-template-columns: repeat(3, 1fr); }
.grid-4{ grid-template-columns: repeat(4, 1fr); }

/* Cards */
.card{
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-md);
  padding: 28px 24px; transition: transform .22s ease, border-color .22s ease, background .22s ease, box-shadow .22s ease;
}
.card:hover{ transform: translateY(-4px); border-color: rgba(96,165,250,0.35); background: var(--surface-strong); box-shadow: 0 24px 50px -24px rgba(37,99,235,0.5); }
.card h3{ font-size: 1.05rem; margin-bottom: 8px; }
.card p{ font-size: 0.92rem; margin-bottom: 0; }

.card-icon{
  width: 46px; height: 46px; border-radius: 12px; margin-bottom: 18px;
  display:flex; align-items:center; justify-content:center;
  background: rgba(96,165,250,0.08); border: 1px solid rgba(96,165,250,0.2); color: var(--blue-300);
}
.card-icon svg{ width: 22px; height: 22px; }
.card-icon--accent{ background: rgba(34,211,238,0.08); border-color: rgba(34,211,238,0.25); color: var(--cyan-400); }

.card-problem{ border-color: rgba(248,113,113,0.0); }
.card-problem .card-icon{ background: rgba(248,113,113,0.08); border-color: rgba(248,113,113,0.22); color: #fca5a5; }
.card-problem:hover{ border-color: rgba(248,113,113,0.3); }

.card-cap--highlight{
  border-color: rgba(34,211,238,0.35);
  background: linear-gradient(160deg, rgba(34,211,238,0.08), rgba(255,255,255,0.02));
  box-shadow: 0 0 0 1px rgba(34,211,238,0.08), 0 20px 46px -26px rgba(34,211,238,0.45);
}
.card-cap--highlight:hover{ border-color: rgba(34,211,238,0.55); }

/* ---------------- Why EntAIFab ---------------- */
.why-grid{ display:grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.check-list{ margin: 26px 0; display:flex; flex-direction:column; gap: 14px; }
.check-list li{ display:flex; align-items:flex-start; gap: 12px; color: var(--text-secondary); font-size: 0.98rem; }
.check-ico{
  flex: none; width: 22px; height: 22px; border-radius: 50%; display:flex; align-items:center; justify-content:center;
  background: rgba(34,211,238,0.12); color: var(--cyan-400); font-size: 0.72rem; font-weight:700; margin-top: 2px;
}
.link-arrow{ color: var(--blue-300); font-weight: 600; font-size: 0.92rem; }
.link-arrow:hover{ color: var(--cyan-400); }

.why-panel{ padding: 8px; }
.why-row{ display:flex; gap: 18px; padding: 20px 22px; border-bottom: 1px solid var(--border); }
.why-row:last-child{ border-bottom: none; }
.why-num{ font-family:"Space Grotesk"; font-weight:700; font-size: 1.4rem; color: rgba(125,211,252,0.35); }
.why-row h4{ margin: 0 0 4px; font-size: 1rem; }
.why-row p{ margin:0; font-size: 0.88rem; }

/* ---------------- Architecture diagram ---------------- */
.architecture-diagram{
  display:grid; grid-template-columns: 1fr auto auto auto 1.15fr; align-items:center; gap: 6px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 40px 34px;
}
.arch-col{ display:flex; flex-direction:column; gap: 12px; }
.arch-col-label{ font-size: 0.72rem; text-transform:uppercase; letter-spacing:0.08em; color: var(--text-tertiary); font-weight:700; margin-bottom: 4px; }
.arch-node{
  border: 1px solid var(--border); background: rgba(255,255,255,0.03); border-radius: 10px;
  padding: 12px 14px; font-size: 0.86rem; font-weight: 500; color: var(--text-secondary);
}
.arch-node--provider{ color: var(--cyan-400); border-color: rgba(34,211,238,0.28); background: rgba(34,211,238,0.05); }
.arch-node--future{ color: var(--text-tertiary); border-style: dashed; }

.arch-connector{ width: 90px; }
.arch-connector svg{ width:100%; height: 100%; overflow: visible; }
.arch-line{ fill:none; stroke: rgba(148,163,184,0.4); stroke-width: 1.4; stroke-dasharray: 5 6; animation: dash 3.4s linear infinite; }
.arch-line--accent{ stroke: rgba(34,211,238,0.55); }
@keyframes dash{ to{ stroke-dashoffset: -100; } }

.arch-hub{ display:flex; flex-direction:column; align-items:center; gap: 10px; text-align:center; }
.arch-hub-core{
  width: 130px; height: 130px; border-radius: 50%; display:flex; flex-direction:column; align-items:center; justify-content:center; gap:4px;
  background: radial-gradient(circle at 35% 30%, rgba(96,165,250,0.3), rgba(8,12,22,0.7));
  border: 1px solid rgba(125,211,252,0.5);
  box-shadow: 0 0 50px 8px rgba(59,130,246,0.35), inset 0 0 24px rgba(125,211,252,0.18);
  animation: pulseGlow 3.2s ease-in-out infinite;
}
.arch-hub-core strong{ font-family:"Space Grotesk"; font-size: 1.05rem; color: var(--text-primary); }
.arch-hub-core span{ font-size: 0.62rem; color: var(--text-tertiary); }
.arch-hub-tag{ font-size: 0.7rem; color: var(--text-tertiary); max-width: 140px; }

/* ---------------- About ---------------- */
.about-grid{ display:grid; grid-template-columns: 1.1fr 0.9fr; gap: 56px; align-items:center; }
.about-copy{ font-size: 1.02rem; }
.about-panel{ padding: 28px; display:flex; flex-direction:column; gap: 14px; }
.about-pill{
  display:flex; align-items:center; gap: 12px; padding: 16px 18px; border-radius: 12px;
  background: rgba(255,255,255,0.03); border: 1px solid var(--border); font-weight: 600; font-size: 0.95rem;
}
.about-pill::before{ content:""; width: 8px; height: 8px; border-radius: 50%; background: var(--gradient-primary); box-shadow: 0 0 10px 2px rgba(59,130,246,0.6); }

/* ---------------- Contact ---------------- */
.contact-section{ padding-bottom: 130px; }
.contact-panel{ padding: 52px; display:grid; grid-template-columns: 1fr 1fr; gap: 50px; }
.contact-cta-row{ display:flex; gap: 12px; flex-wrap: wrap; margin-top: 8px; }

.contact-form{ display:flex; flex-direction:column; gap: 16px; }
.form-row{ display:grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.contact-form label{ display:flex; flex-direction:column; gap: 8px; font-size: 0.82rem; color: var(--text-tertiary); font-weight:600; }
.contact-form label.full{ grid-column: 1 / -1; }
.contact-form input, .contact-form textarea{
  font-family: inherit; font-size: 0.94rem; color: var(--text-primary);
  background: rgba(255,255,255,0.03); border: 1px solid var(--border); border-radius: 10px;
  padding: 11px 13px; resize: vertical; transition: border-color .15s ease, background .15s ease;
}
.contact-form input:focus, .contact-form textarea:focus{ outline:none; border-color: var(--blue-400); background: rgba(96,165,250,0.06); }
.form-submit{ align-self: flex-start; margin-top: 4px; }
.form-note{ font-size: 0.85rem; color: var(--cyan-400); min-height: 1.2em; margin: 0; }

/* ---------------- Footer ---------------- */
.site-footer{ border-top: 1px solid var(--border); padding: 44px 0; }
.footer-inner{ display:flex; align-items:center; justify-content:space-between; gap: 24px; flex-wrap: wrap; }
.footer-brand{ display:flex; align-items:center; }
.footer-logo{ height: 30px; width: auto; display: block; margin-bottom: 6px; }
.footer-brand p{ margin:0; font-size: 0.72rem; color: var(--text-tertiary); }
.footer-links{ display:flex; gap: 22px; flex-wrap: wrap; }
.footer-links a{ font-size: 0.85rem; color: var(--text-secondary); }
.footer-links a:hover{ color: var(--text-primary); }
.footer-meta{ text-align: right; font-size: 0.78rem; color: var(--text-tertiary); }
.footer-meta p{ margin: 0 0 4px; }
.footer-meta a{ color: var(--blue-300); font-weight:600; }

/* ---------------- Scroll reveal ---------------- */
.reveal{ opacity: 0; transform: translateY(24px); transition: opacity .7s cubic-bezier(.2,.7,.2,1), transform .7s cubic-bezier(.2,.7,.2,1); }
.reveal.is-visible{ opacity: 1; transform: translateY(0); }

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 1080px){
  .grid-4{ grid-template-columns: repeat(3,1fr); }
  .architecture-diagram{ grid-template-columns: 1fr; text-align:center; }
  .arch-connector{ width: 100%; height: 60px; margin: 0 auto; transform: rotate(90deg); }
  .arch-col{ align-items:center; }
  .arch-hub{ margin: 10px 0; }
}

@media (max-width: 860px){
  .nav-links, .nav-cta{ display:none; }
  .nav-toggle{ display:flex; }
  .site-header.nav-open .nav-links{
    display:flex; position:absolute; top: 76px; left:0; right:0; flex-direction:column; gap:0;
    background: rgba(5,7,13,0.97); border-bottom: 1px solid var(--border); padding: 8px 32px 20px;
  }
  .site-header.nav-open .nav-links a{ padding: 14px 0; border-bottom: 1px solid var(--border); }
  .site-header.nav-open .nav-cta{ display:flex; position:absolute; top: calc(76px + 1px); }

  .hero-inner{ grid-template-columns: 1fr; }
  .hero-visual{ order: -1; }
  .why-grid, .about-grid{ grid-template-columns: 1fr; }
  .contact-panel{ grid-template-columns: 1fr; padding: 32px; }
  .grid-3{ grid-template-columns: repeat(2,1fr); }
  .grid-4{ grid-template-columns: repeat(2,1fr); }
}

@media (max-width: 560px){
  .container{ padding: 0 20px; }
  .section{ padding: 76px 0; }
  .hero{ padding: 56px 0 64px; }
  .grid-3, .grid-4{ grid-template-columns: 1fr; }
  .hero-actions .btn, .contact-cta-row .btn{ width: 100%; }
  .form-row{ grid-template-columns: 1fr; }
  .footer-inner{ flex-direction:column; align-items:flex-start; text-align:left; }
  .footer-meta{ text-align:left; }
}

@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior: auto; }
  .reveal{ transition: none; opacity:1; transform:none; }
  .hub-node--center, .arch-hub-core{ animation: none; }
  .arch-line{ animation: none; }
}