/* =========================================
   3D HI — styles.css
   ========================================= */

/* --- TOKENS --- */
:root {
  --primary: #06b6d4;       /* aqua blue */
  --primary-dark: #0891b2;
  --secondary: #f97316;     /* sunset orange */
  --accent: #f59e0b;        /* amber */
  --bg: #f8fafc;
  --text: #0f172a;
  --surface: #ffffff;
  --border: #e0f2fe;
  --ring: #06b6d4;
  --grad-hero: linear-gradient(135deg, #0891b2 0%, #06b6d4 40%, #f97316 100%);
  --grad-card: linear-gradient(135deg, #ecfeff 0%, #fff7ed 100%);
  --font-head: 'Montserrat', sans-serif;
  --font-body: 'Open Sans', sans-serif;
}

/* --- RESET / BASE --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: var(--font-body); background: var(--bg); color: var(--text); line-height: 1.6; }
h1,h2,h3 { font-family: var(--font-head); line-height: 1.2; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }

/* --- NAV --- */
.sticky-nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(6, 182, 212, 0.97);
  backdrop-filter: blur(8px);
  box-shadow: 0 2px 12px rgba(0,0,0,0.15);
}
.nav-inner {
  max-width: 1100px; margin: auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.75rem 1.25rem;
}
.nav-logo {
  font-family: var(--font-head); font-size: 1.5rem; font-weight: 900;
  color: #fff; letter-spacing: 0.05em;
  text-decoration: none;
}
.nav-links {
  display: flex; gap: 1.25rem; list-style: none;
}
.nav-links a {
  color: #fff; font-weight: 600; font-size: 0.875rem;
  padding: 0.25rem 0.5rem; border-radius: 4px;
  transition: background 0.2s;
  text-decoration: none;
}
.nav-links a:hover { background: rgba(255,255,255,0.2); }
.nav-toggle { display: none; background: none; border: none; color: #fff; font-size: 1.5rem; cursor: pointer; }
@media (max-width: 720px) {
  .nav-toggle { display: block; }
  .nav-links {
    display: none; flex-direction: column; gap: 0;
    position: absolute; top: 100%; left: 0; right: 0;
    background: var(--primary-dark); padding: 0.75rem 1.25rem;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 0.5rem 0; }
}

/* --- HERO --- */
.hero-shell {
  background: var(--grad-hero);
  color: #fff;
  padding: 5rem 1.25rem 4rem;
  display: flex; flex-wrap: wrap; align-items: center;
  justify-content: center; gap: 2.5rem;
}
.hero-content { max-width: 560px; }
.hero-content h1 {
  font-size: clamp(3rem, 8vw, 5.5rem);
  font-weight: 900; letter-spacing: -0.02em;
  text-shadow: 0 2px 12px rgba(0,0,0,0.25);
}
.hero-sub { font-size: 1.25rem; font-weight: 700; margin: 0.5rem 0 1rem; opacity: 0.92; font-family: var(--font-head); }
.hero-body { font-size: 1rem; opacity: 0.88; max-width: 460px; margin-bottom: 1.75rem; }
.hero-ctas { display: flex; flex-wrap: wrap; gap: 0.75rem; }
.hero-badge-col { display: flex; flex-direction: column; gap: 1rem; }
.hero-badge {
  background: rgba(255,255,255,0.18);
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: 12px; padding: 1rem 1.5rem;
  text-align: center; min-width: 130px;
}
.badge-num { display: block; font-family: var(--font-head); font-size: 2rem; font-weight: 900; }
.badge-label { font-size: 0.8rem; opacity: 0.85; }

/* --- BUTTONS --- */
.btn-primary {
  display: inline-block;
  background: var(--secondary);
  color: #fff; font-weight: 700; font-family: var(--font-head);
  padding: 0.65rem 1.5rem; border-radius: 999px;
  border: none; cursor: pointer; font-size: 0.9rem;
  transition: background 0.2s, transform 0.15s;
  text-decoration: none;
}
.btn-primary:hover { background: #ea6f10; transform: translateY(-1px); text-decoration: none; }

.btn-secondary {
  display: inline-block;
  background: transparent;
  color: #fff; font-weight: 700; font-family: var(--font-head);
  padding: 0.65rem 1.5rem; border-radius: 999px;
  border: 2px solid rgba(255,255,255,0.7); cursor: pointer; font-size: 0.9rem;
  transition: background 0.2s;
  text-decoration: none;
}
.btn-secondary:hover { background: rgba(255,255,255,0.15); text-decoration: none; }

/* Non-hero secondary button */
section:not(.hero-shell) .btn-secondary {
  color: var(--primary-dark);
  border-color: var(--primary);
}
section:not(.hero-shell) .btn-secondary:hover { background: #ecfeff; }

/* --- SECTION SHELL --- */
.section-shell {
  padding: 4rem 1.25rem;
  max-width: 100%;
}
.section-shell > * { max-width: 1100px; margin-left: auto; margin-right: auto; }
.section-heading {
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  font-weight: 900; color: var(--text);
  margin-bottom: 0.5rem; text-align: center;
}
.section-sub {
  text-align: center; color: #475569; max-width: 620px;
  margin: 0 auto 2.5rem; font-size: 1rem;
}
.section-note { text-align: center; margin-top: 1.5rem; color: #64748b; font-size: 0.9rem; }

/* --- DIAGONAL VARIANTS --- */
.diagonal-light { background: linear-gradient(160deg, #ecfeff 0%, #fff7ed 100%); }
.diagonal-dark { background: linear-gradient(160deg, #0891b2 0%, #0f172a 100%); }
.diagonal-dark .section-heading,
.diagonal-dark .section-sub,
.diagonal-dark p { color: #e2e8f0; }
.diagonal-dark .section-heading { color: #fff; }
.diagonal-dark .card { background: rgba(255,255,255,0.1); border-color: rgba(255,255,255,0.2); color: #e2e8f0; }
.diagonal-dark .card h3 { color: #fff; }

/* --- CARD