/* ==========================================================================
   Hydrogen Oxygen Machines — fresh design system (Bootstrap 5 + custom)
   ========================================================================== */

:root {
  --brand:       #007bbd;
  --brand-2:     #00b09b;
  --ink:         #0e2a38;
  --body:        #38505b;
  --muted:       #6b7c85;
  --soft:        #f1f8fb;
  --line:        #e2edf2;
  --grad:        linear-gradient(135deg, #007bbd 0%, #00b09b 100%);
  --shadow-sm:   0 2px 10px rgba(14, 42, 56, .06);
  --shadow-md:   0 10px 30px rgba(14, 42, 56, .10);
  --radius:      14px;
}

* { scroll-behavior: smooth; }

body {
  font-family: 'Inter', system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--body);
  font-size: 1.02rem;
  line-height: 1.7;
}

h1, h2, h3, h4, h5, .hero-title { color: var(--ink); font-weight: 700; line-height: 1.2; }
h2 { font-size: clamp(1.6rem, 3vw, 2.3rem); }
a { color: var(--brand); text-decoration: none; }
a:hover { color: var(--brand-2); }

.eyebrow {
  text-transform: uppercase; letter-spacing: .12em; font-size: .8rem;
  font-weight: 700; color: var(--brand); margin-bottom: .5rem;
}

/* ---------- Buttons ---------- */
.btn { border-radius: 999px; font-weight: 600; padding: .65rem 1.5rem; }
.btn-primary-brand { background: var(--grad); border: none; color: #fff; }
.btn-primary-brand:hover { color: #fff; filter: brightness(1.06); box-shadow: var(--shadow-md); }
.btn-hero { background: #fff; color: var(--brand); border: none; }
.btn-hero:hover { color: var(--brand-2); box-shadow: var(--shadow-md); }
.btn-outline-brand { border: 2px solid var(--brand); color: var(--brand); background: transparent; }
.btn-outline-brand:hover { background: var(--brand); color: #fff; }

/* ---------- Top bar ---------- */
.topbar { background: var(--ink); color: #cfe6f0; font-size: .85rem; padding: .4rem 0; }

/* ---------- Navbar ---------- */
.site-nav { background: rgba(255,255,255,.96); backdrop-filter: saturate(180%) blur(8px);
  box-shadow: var(--shadow-sm); padding: .7rem 0; }
.site-nav .navbar-brand { font-weight: 800; color: var(--ink); letter-spacing: -.01em; }
.site-nav .nav-link { color: var(--ink); font-weight: 600; padding: .4rem .9rem; border-radius: 8px; }
.site-nav .nav-link:hover, .site-nav .nav-link.active { color: var(--brand); }
.lang-toggle { color: var(--muted) !important; }

/* ---------- Hero carousel ---------- */
.hero-slide {
  background: var(--grad);
  min-height: 74vh; display: flex; align-items: center;
  padding: 5rem 0; position: relative; overflow: hidden;
}
.hero-slide::after {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(circle at 80% 20%, rgba(255,255,255,.18), transparent 45%);
}
.hero-content { position: relative; max-width: 720px; color: #fff; }
.hero .eyebrow { color: rgba(255,255,255,.85); }
.hero-title { color: #fff; font-size: clamp(2.1rem, 5vw, 3.4rem); font-weight: 800; }
.hero-text { color: rgba(255,255,255,.92); font-size: 1.2rem; margin: 1.1rem 0 1.8rem; }
.carousel-indicators [data-bs-target] { width: 10px; height: 10px; border-radius: 50%; }

/* ---------- Sections ---------- */
.section { padding: 5rem 0; }
.section-head { max-width: 720px; margin: 0 auto 3rem; }
.features { background: var(--soft); }

/* ---------- Feature cards ---------- */
.feature-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 2rem 1.75rem; box-shadow: var(--shadow-sm);
  transition: transform .2s ease, box-shadow .2s ease;
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.feature-icon {
  width: 60px; height: 60px; border-radius: 14px; display: flex;
  align-items: center; justify-content: center; margin-bottom: 1.1rem;
  background: rgba(0,123,189,.10); color: var(--brand); font-size: 1.5rem;
}
.feature-title { font-size: 1.2rem; margin-bottom: .5rem; }
.feature-desc { color: var(--muted); margin: 0; }

/* ---------- Product highlight ---------- */
.product-highlight { background: #fff; }
.lead-text { font-size: 1.2rem; color: var(--body); margin-bottom: 1.6rem; }
.highlight-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.stat {
  background: var(--soft); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.5rem; text-align: center;
}
.stat-num { display: block; font-size: 1.9rem; font-weight: 800; color: var(--brand); line-height: 1; }
.stat-label { display: block; margin-top: .4rem; color: var(--muted); font-size: .9rem; }

/* ---------- CTA band ---------- */
.cta-band { background: var(--grad); color: #fff; }
.cta-band h2 { color: #fff; }
.cta-sub { color: rgba(255,255,255,.9); font-size: 1.15rem; max-width: 640px; margin: .5rem auto 1.6rem; }
.cta-icon { font-size: 2.4rem; margin-bottom: .6rem; }

/* ---------- Footer ---------- */
.site-footer { background: var(--ink); color: #b9cdd7; padding-top: 3.5rem; }
.site-footer h5, .footer-brand { color: #fff; }
.footer-brand { font-weight: 800; font-size: 1.25rem; margin-bottom: .8rem; }
.footer-heading { font-size: 1rem; margin-bottom: 1rem; }
.footer-links a { color: #b9cdd7; display: block; padding: .25rem 0; }
.footer-links a:hover { color: #fff; }
.text-muted-light, .footer-about { color: #94adb8; }
.footer-about p { margin-bottom: .4rem; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.12); margin-top: 3rem; padding: 1.3rem 0; font-size: .9rem; }

/* ==========================================================================
   Product page (AirPlus) — shared building blocks
   ========================================================================== */
.page-single { padding: 2.5rem 0 0; }
.prod-hero { border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-md); }
.prod-hero img { width: 100%; height: auto; display: block; }
.prod-intro { max-width: 860px; margin: 2rem auto 0; }
.badge-list { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: .6rem 1.4rem; justify-content: center; }
.badge-list li { font-weight: 600; color: var(--ink); }
.badge-list i { color: var(--brand-2); margin-right: .35rem; }

.block { padding: 3rem 0; border-top: 1px solid var(--line); }
.block-head { max-width: 760px; margin: 0 auto 2rem; }

.spec-table { width: 100%; border-collapse: collapse; }
.spec-table th, .spec-table td { padding: .85rem 1rem; border-bottom: 1px solid var(--line); text-align: left; }
.spec-table th { width: 42%; color: var(--ink); font-weight: 600; background: var(--soft); }

.mode-card, .box {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.75rem; box-shadow: var(--shadow-sm); height: 100%;
}
.faq-q { color: var(--ink); font-weight: 700; margin-top: 1.6rem; }
.faq-a { color: var(--muted); }

@media (max-width: 575px) {
  .hero-slide { min-height: 62vh; }
  .highlight-stats { grid-template-columns: 1fr 1fr; }
}