/* ============================================
   AI HUB 4 BIZ — Dark Theme
   ============================================ */

:root {
  --bg: #0b1219;
  --bg-card: #111c27;
  --bg-elevated: #172435;
  --bg-hover: #1c2d40;
  --ink: #e8e3d9;
  --ink-soft: rgba(232, 227, 217, 0.72);
  --muted: rgba(232, 227, 217, 0.45);
  --accent: #c8532a;
  --accent-hover: #e06030;
  --accent-soft: rgba(200, 83, 42, 0.15);
  --teal: #2db89a;
  --teal-soft: rgba(45, 184, 154, 0.12);
  --line: rgba(232, 227, 217, 0.1);
  --line-strong: rgba(232, 227, 217, 0.18);
  --white: #ffffff;

  --font-display: 'Fraunces', Georgia, 'Times New Roman', serif;
  --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --maxw: 1200px;
  --radius: 6px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
html, body { overflow-x: hidden; max-width: 100%; }
img, svg, video { max-width: 100%; height: auto; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.65;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
}

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 28px; }

h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 500; letter-spacing: -0.02em; line-height: 1.1; color: var(--ink); }
h1 { font-size: clamp(2.4rem, 5vw, 4.2rem); }
h2 { font-size: clamp(1.8rem, 3vw, 2.6rem); }
h3 { font-size: 1.35rem; }
p { margin-bottom: 1rem; color: var(--ink-soft); }
a { color: var(--accent); text-decoration: none; transition: color .2s; }
a:hover { color: var(--accent-hover); text-decoration: underline; }

/* ---------- Header ---------- */
.site-header { position: sticky; top: 0; background: rgba(11, 18, 25, 0.88); backdrop-filter: blur(14px); border-bottom: 1px solid var(--line); z-index: 100; }
.site-header .container { display: flex; justify-content: space-between; align-items: center; padding-top: 16px; padding-bottom: 16px; }
.logo-link { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.logo-link:hover { text-decoration: none; }
.logo-mark { flex-shrink: 0; }
.logo-group { display: flex; flex-direction: column; gap: 0; }
.logo-text { font-family: var(--font-display); font-size: 1.35rem; font-weight: 600; color: var(--ink); letter-spacing: -0.02em; line-height: 1.2; }
.logo-tagline { font-family: var(--font-body); font-size: 0.68rem; font-weight: 500; color: var(--accent); letter-spacing: 0.12em; text-transform: uppercase; line-height: 1; margin-top: 2px; }
.logo-4 { color: var(--accent); }
nav ul { list-style: none; display: flex; gap: 28px; }
nav a { color: var(--ink-soft); font-size: 0.92rem; font-weight: 500; transition: color .2s; }
nav a:hover { color: var(--accent); text-decoration: none; }
nav a.active { color: var(--accent); }
.mobile-toggle { display: none; background: none; border: none; font-size: 1.4rem; cursor: pointer; color: var(--ink); }

/* ---------- Buttons ---------- */
.btn { display: inline-block; padding: 14px 28px; background: var(--accent); color: var(--white); border: none; border-radius: var(--radius); font-family: var(--font-body); font-size: 1rem; font-weight: 500; cursor: pointer; transition: all .2s ease; }
.btn:hover { background: var(--accent-hover); color: var(--white); text-decoration: none; transform: translateY(-1px); }
.btn-outline { background: transparent; color: var(--ink); border: 1px solid var(--line-strong); }
.btn-outline:hover { background: var(--bg-elevated); color: var(--ink); border-color: var(--accent); transform: translateY(-1px); }

/* ---------- Hero ---------- */
.hero { padding: 100px 0 80px; position: relative; overflow: hidden; }
.hero::before { content: ""; position: absolute; top: -60%; right: -20%; width: 600px; height: 600px; background: radial-gradient(circle, rgba(200, 83, 42, 0.08) 0%, transparent 70%); pointer-events: none; }
.hero-grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: 60px; align-items: center; }
.hero-eyebrow { display: inline-block; font-size: 0.82rem; font-weight: 500; text-transform: uppercase; letter-spacing: 0.14em; color: var(--teal); margin-bottom: 20px; }
.hero h1 { margin-bottom: 24px; }
.hero h1 em { font-style: italic; font-weight: 300; color: var(--accent); }
.hero-sub { font-size: 1.18rem; color: var(--ink-soft); margin-bottom: 36px; max-width: 560px; }
.hero-ctas { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-visual { position: relative; aspect-ratio: 1; background: var(--bg-card); border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
.hero-visual svg { width: 100%; height: 100%; }

/* ---------- Sections ---------- */
section { padding: 80px 0; }
.section-label { font-size: 0.78rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.16em; color: var(--teal); margin-bottom: 12px; }
.section-title { margin-bottom: 56px; max-width: 720px; }
.section-title h2 { margin-bottom: 16px; }
.section-title p { font-size: 1.1rem; }

/* ---------- Value grid ---------- */
.value-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
.value-card { background: var(--bg-card); padding: 40px 32px; transition: background .2s; }
.value-card:hover { background: var(--bg-elevated); }
.value-num { font-family: var(--font-display); font-size: 2.2rem; font-weight: 300; color: var(--accent); margin-bottom: 18px; font-style: italic; }
.value-card h3 { margin-bottom: 12px; }

/* ---------- Category cards ---------- */
.cat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; }
.cat-card { background: var(--bg-card); border: 1px solid var(--line); border-radius: 8px; padding: 28px 24px; transition: all .25s; display: block; color: var(--ink); }
.cat-card:hover { background: var(--bg-elevated); border-color: var(--accent); text-decoration: none; color: var(--ink); transform: translateY(-2px); }
.cat-icon { font-size: 1.5rem; margin-bottom: 14px; display: block; }
.cat-card h3 { margin-bottom: 8px; font-size: 1.15rem; }
.cat-card p { font-size: 0.92rem; margin-bottom: 12px; }
.cat-count { font-size: 0.8rem; color: var(--teal); font-weight: 500; }

/* ---------- Help (consulting) ---------- */
.help-section { background: var(--bg-card); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.help-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 48px 64px; margin-top: 40px; }
.help-item { padding-left: 24px; border-left: 2px solid var(--accent); }
.help-item h3 { margin-bottom: 10px; font-size: 1.2rem; }

/* ---------- CTA band ---------- */
.cta-band { background: var(--bg-elevated); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); text-align: center; padding: 80px 0; }
.cta-band h2 { margin-bottom: 20px; }
.cta-band p { font-size: 1.15rem; margin-bottom: 32px; max-width: 600px; margin-left: auto; margin-right: auto; }

/* ---------- Blog ---------- */
.blog-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 40px; }
.blog-card { border-top: 1px solid var(--line); padding-top: 24px; display: block; color: var(--ink); }
.blog-card:hover { color: var(--ink); text-decoration: none; }
.blog-card:hover h3 { color: var(--accent); }
.blog-meta { font-size: 0.82rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 12px; }
.blog-card h3 { margin-bottom: 12px; transition: color .2s; }
.blog-card p { font-size: 0.98rem; }
.blog-card .read-more { color: var(--accent); font-weight: 500; font-size: 0.9rem; }

/* ---------- Article ---------- */
.article { max-width: 720px; margin: 0 auto; padding: 80px 28px; }
.article header { margin-bottom: 48px; padding-bottom: 32px; border-bottom: 1px solid var(--line); }
.article h1 { margin-bottom: 16px; }
.article .meta { color: var(--muted); font-size: 0.95rem; }
.article h2, .article h3 { margin-top: 2.2em; margin-bottom: 0.8em; }
.article p { margin-bottom: 1.2em; font-size: 1.08rem; }
.article ul, .article ol { margin: 0 0 1.2em 1.4em; color: var(--ink-soft); }
.article li { margin-bottom: 0.5em; }
.article blockquote { border-left: 3px solid var(--accent); padding: 8px 0 8px 24px; margin: 1.6em 0; font-family: var(--font-display); font-style: italic; font-size: 1.3rem; color: var(--ink); }

/* ---------- About ---------- */
.about-hero { padding: 80px 0 40px; }
.about-grid { display: grid; grid-template-columns: 1fr 1.6fr; gap: 64px; align-items: start; }
.about-photo { aspect-ratio: 4/5; background: var(--bg-card); border: 1px solid var(--line); border-radius: 8px; display: flex; align-items: center; justify-content: center; color: var(--muted); font-family: var(--font-display); font-size: 1.3rem; font-style: italic; }
.about-content h1 { margin-bottom: 28px; }
.about-content p { font-size: 1.1rem; margin-bottom: 1.3em; }

/* ---------- Contact ---------- */
.contact-wrap { display: grid; grid-template-columns: 1fr 1.2fr; gap: 64px; }
.contact-info .info-block { margin-bottom: 32px; }
.contact-info .label { font-size: 0.78rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.14em; color: var(--teal); margin-bottom: 6px; display: block; }
.form-group { margin-bottom: 22px; }
.form-group label { display: block; font-size: 0.9rem; font-weight: 500; margin-bottom: 8px; color: var(--ink); }
.form-group input, .form-group textarea, .form-group select { width: 100%; padding: 13px 16px; border: 1px solid var(--line-strong); border-radius: var(--radius); background: var(--bg-card); font-family: var(--font-body); font-size: 1rem; color: var(--ink); transition: border-color .2s; }
.form-group input::placeholder, .form-group textarea::placeholder { color: var(--muted); }
.form-group input:focus, .form-group textarea:focus, .form-group select:focus { outline: none; border-color: var(--accent); }
.form-group select option { background: var(--bg-card); color: var(--ink); }
.form-group textarea { resize: vertical; min-height: 140px; }

/* ---------- Legal ---------- */
.legal { max-width: 760px; margin: 0 auto; padding: 80px 28px; }
.legal h1 { margin-bottom: 12px; }
.legal .last-updated { color: var(--muted); margin-bottom: 48px; font-size: 0.95rem; }
.legal h2 { margin-top: 2em; margin-bottom: 0.6em; font-size: 1.5rem; }
.legal p, .legal li { margin-bottom: 0.9em; }
.legal ul { margin: 0 0 1em 1.4em; color: var(--ink-soft); }

/* ---------- Footer ---------- */
.site-footer { background: var(--bg-card); color: var(--ink-soft); padding: 60px 0 32px; margin-top: 80px; border-top: 1px solid var(--line); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 48px; }
.site-footer h4 { color: var(--ink); font-family: var(--font-body); font-size: 0.82rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.14em; margin-bottom: 18px; }
.site-footer .logo-link { margin-bottom: 12px; }
.site-footer p { color: var(--muted); font-size: 0.92rem; }
.footer-tagline { color: var(--accent); font-size: 0.82rem; font-weight: 500; letter-spacing: 0.08em; margin-top: 4px; }
.site-footer ul { list-style: none; }
.site-footer li { margin-bottom: 10px; }
.site-footer a { color: var(--ink-soft); font-size: 0.92rem; }
.site-footer a:hover { color: var(--accent); text-decoration: none; }
.footer-bottom { border-top: 1px solid var(--line); padding-top: 24px; font-size: 0.82rem; text-align: center; color: var(--muted); }

/* ---------- Animations ---------- */
@keyframes fadeUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
.fade-up { animation: fadeUp .8s ease both; }
.fade-up-1 { animation: fadeUp .8s ease .1s both; opacity: 0; }
.fade-up-2 { animation: fadeUp .8s ease .25s both; opacity: 0; }
.fade-up-3 { animation: fadeUp .8s ease .4s both; opacity: 0; }
.fade-up-4 { animation: fadeUp .8s ease .55s both; opacity: 0; }

/* ---------- Responsive ---------- */
@media (hover: none) and (pointer: coarse) { nav a, .btn, .mobile-toggle { min-height: 44px; } nav a { display: flex; align-items: center; } }

@media (max-width: 860px) {
  .hero { padding: 60px 0 40px; } .hero-grid { grid-template-columns: 1fr; gap: 40px; } .hero-visual { max-width: 400px; margin: 0 auto; }
  .value-grid { grid-template-columns: 1fr; } .help-grid { grid-template-columns: 1fr; gap: 32px; }
  .about-grid { grid-template-columns: 1fr; gap: 40px; } .about-photo { max-width: 320px; margin: 0 auto; }
  .contact-wrap { grid-template-columns: 1fr; gap: 40px; } .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  section { padding: 56px 0; }
  nav { display: none; } nav.open { display: block; position: absolute; top: 100%; left: 0; right: 0; background: var(--bg); border-bottom: 1px solid var(--line); padding: 20px 28px; }
  nav.open ul { flex-direction: column; gap: 16px; } .mobile-toggle { display: block; }
}

@media (max-width: 640px) {
  body { font-size: 16px; } .container { padding: 0 20px; }
  .site-header .container { padding-top: 14px; padding-bottom: 14px; } .logo-text { font-size: 1.1rem; }
  .logo-tagline { font-size: 0.6rem; letter-spacing: 0.08em; }
  .hero { padding: 40px 0 32px; } .hero h1 { font-size: clamp(2rem, 8vw, 2.6rem); } .hero-sub { font-size: 1.05rem; margin-bottom: 28px; }
  .hero-eyebrow { font-size: 0.76rem; margin-bottom: 14px; } .hero-visual { max-width: 100%; }
  .hero-ctas { flex-direction: column; gap: 10px; } .hero-ctas .btn { width: 100%; text-align: center; }
  section { padding: 48px 0; } .section-title { margin-bottom: 40px; } .section-title h2 { font-size: clamp(1.6rem, 6vw, 2rem); }
  .value-card { padding: 32px 24px; } .value-num { font-size: 1.8rem; }
  .cat-grid { grid-template-columns: 1fr; gap: 16px; } .blog-grid { grid-template-columns: 1fr; gap: 28px; }
  .article { padding: 48px 20px; } .article h1 { font-size: clamp(1.9rem, 7vw, 2.4rem); }
  .about-hero { padding: 48px 0 24px; } .about-photo { max-width: 260px; }
  .form-group input, .form-group textarea, .form-group select { font-size: 16px; padding: 12px 14px; }
  .btn { width: 100%; padding: 14px 24px; } .contact-info .btn, .article .btn { width: auto; }
  .legal { padding: 48px 20px; } .legal h1 { font-size: 2rem; } .legal h2 { font-size: 1.3rem; }
  .site-footer { padding: 48px 0 24px; margin-top: 56px; } .footer-grid { grid-template-columns: 1fr; gap: 28px; }
}

@media (max-width: 380px) {
  .container { padding: 0 16px; } .hero h1 { font-size: 1.85rem; } .section-title h2 { font-size: 1.5rem; }
  .logo-text { font-size: 1rem; } .value-card { padding: 28px 20px; } .article { padding: 40px 16px; } .legal { padding: 40px 16px; }
}

@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; } }