/* =====================
   BELMONT OS — THEME
   ===================== */

/* Reset & Base */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --navy:    #0f1923;
  --amber:   #f5a623;
  --cream:   #faf9f6;
  --slate:   #4a5568;
  --light:   #e8e4dc;
  --white:   #ffffff;
  --mono:    'DM Sans', sans-serif;
  --serif:   'Fraunces', serif;
}

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--mono);
  background: var(--cream);
  color: var(--navy);
  -webkit-font-smoothing: antialiased;
}

/* Nav */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: var(--navy);
  border-bottom: 1px solid rgba(245,166,35,0.2);
}
.nav-inner {
  max-width: 1100px; margin: 0 auto;
  padding: 14px 24px;
  display: flex; align-items: center; justify-content: space-between;
}
.nav-logo {
  font-family: var(--serif);
  font-size: 1.25rem; font-weight: 700;
  color: var(--amber);
  letter-spacing: -0.01em;
}
.nav-tag {
  font-size: 0.75rem; color: rgba(255,255,255,0.45);
  letter-spacing: 0.04em; text-transform: uppercase;
}

/* Hero */
.hero {
  background: var(--navy);
  color: var(--white);
  padding: 80px 24px 0;
  overflow: hidden;
}
.hero-inner { max-width: 1100px; margin: 0 auto; }
.hero-eyebrow {
  font-size: 0.75rem; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--amber); margin-bottom: 24px;
  display: inline-block; border: 1px solid rgba(245,166,35,0.4);
  padding: 4px 12px; border-radius: 2px;
}
.hero-headline {
  font-family: var(--serif);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--white);
  max-width: 680px;
  margin-bottom: 24px;
}
.hero-sub {
  font-size: 1.05rem; line-height: 1.65;
  color: rgba(255,255,255,0.65);
  max-width: 560px;
  margin-bottom: 48px;
}

/* Hero visual — CSS illustration */
.hero-visual {
  display: flex; align-items: flex-end; gap: 0;
  margin: 0 -24px;
  padding: 0 0 0;
  border-top: 1px solid rgba(255,255,255,0.08);
  background: linear-gradient(to top, rgba(245,166,35,0.04) 0%, transparent 40%);
}
.visual-ladder {
  display: flex; flex-direction: column;
  align-items: center;
  padding: 0 24px 40px 32px;
}
.ladder-rails { display: flex; gap: 24px; }
.ladder-rail {
  width: 4px; height: 240px;
  background: rgba(255,255,255,0.15);
  border-radius: 2px;
}
.ladder-rail--left { align-self: flex-start; height: 260px; }
.ladder-rail--right { align-self: flex-start; height: 260px; }
.ladder-rungs {
  display: flex; flex-direction: column;
  gap: 22px; padding: 0 8px;
  position: absolute; left: 50%; transform: translateX(-50%);
}
.ladder-rungs { position: relative; display: flex; flex-direction: column; gap: 22px; }
.rung {
  width: 48px; height: 4px;
  background: rgba(255,255,255,0.18);
  border-radius: 2px;
}
.rung--highlight { background: var(--amber); }

.visual-guy {
  flex: 1; display: flex; flex-direction: column; align-items: center;
  padding: 0 16px 40px;
}
.guy-head {
  width: 20px; height: 20px;
  background: var(--amber);
  border-radius: 50%;
  margin-bottom: 4px;
}
.guy-body {
  width: 14px; height: 36px;
  background: rgba(255,255,255,0.15);
  border-radius: 4px;
}
.guy-label {
  font-size: 0.65rem; color: rgba(255,255,255,0.4);
  text-align: center; margin-top: 8px; max-width: 70px; line-height: 1.3;
}

.visual-cable {
  display: flex; flex-direction: column; align-items: center;
  padding: 0 8px 40px;
}
.cable-line {
  width: 3px; height: 160px;
  background: repeating-linear-gradient(
    to bottom,
    var(--amber) 0px, var(--amber) 8px,
    transparent 8px, transparent 14px
  );
  border-radius: 2px;
}
.cable-label {
  font-size: 0.65rem; color: rgba(255,255,255,0.4);
  text-align: center; margin-top: 8px; max-width: 70px; line-height: 1.3;
}

.visual-hatch {
  flex: 1; display: flex; flex-direction: column; align-items: center;
  padding: 0 24px 40px 8px;
}
.hatch-box {
  width: 80px; height: 50px;
  border: 3px solid var(--amber);
  border-radius: 4px;
  background: rgba(245,166,35,0.1);
  position: relative;
}
.hatch-box::after {
  content: '';
  position: absolute;
  top: -20px; left: 50%; transform: translateX(-50%);
  width: 2px; height: 20px;
  background: rgba(255,255,255,0.1);
}
.hatch-label {
  font-size: 0.65rem; color: rgba(255,255,255,0.4);
  text-align: center; margin-top: 12px; max-width: 90px; line-height: 1.3;
}

/* Stats */
.stats {
  background: var(--amber);
  padding: 32px 24px;
}
.stats-inner {
  max-width: 1100px; margin: 0 auto;
  display: flex; align-items: center; gap: 0;
}
.stat { flex: 1; text-align: center; padding: 8px 24px; }
.stat-value {
  font-family: var(--serif);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 900;
  color: var(--navy);
  line-height: 1;
  margin-bottom: 6px;
}
.stat-label {
  font-size: 0.8rem; color: rgba(15,25,35,0.7);
  line-height: 1.4;
  font-weight: 500;
}
.stat-divider {
  width: 1px; height: 48px;
  background: rgba(15,25,35,0.2);
  flex-shrink: 0;
}

/* Section header */
.section-eyebrow {
  font-size: 0.7rem; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--amber); font-weight: 600; margin-bottom: 12px;
}
.section-headline {
  font-family: var(--serif);
  font-size: clamp(1.5rem, 3.5vw, 2.25rem);
  font-weight: 700;
  color: var(--navy);
  line-height: 1.15;
  margin-bottom: 40px;
}

/* How */
.how { padding: 80px 24px; }
.how-inner { max-width: 1100px; margin: 0 auto; }
.how-body {
  display: grid; grid-template-columns: 1fr 1fr; gap: 64px;
}
.how-text {
  font-size: 1rem; line-height: 1.7;
  color: var(--slate); margin-bottom: 20px;
}
.how-text.strong {
  font-family: var(--serif);
  font-size: 1.15rem; font-weight: 600;
  color: var(--navy);
  border-left: 3px solid var(--amber);
  padding-left: 16px;
}
.comparison-card {
  background: var(--white);
  border: 1px solid var(--light);
  border-radius: 6px; padding: 24px; margin-bottom: 16px;
}
.comparison-card--active {
  border-color: var(--amber);
  box-shadow: 0 0 0 1px var(--amber);
}
.comparison-title {
  font-size: 0.75rem; font-weight: 600; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--slate); margin-bottom: 16px;
}
.comparison-card--active .comparison-title { color: var(--amber); }
.comparison-list { list-style: none; }
.comparison-list li {
  font-size: 0.9rem; line-height: 1.5;
  color: var(--slate); padding: 6px 0;
  border-bottom: 1px solid var(--light);
  position: relative; padding-left: 20px;
}
.comparison-list li:last-child { border-bottom: none; }
.comparison-list li::before {
  content: ''; position: absolute; left: 0; top: 50%; transform: translateY(-50%);
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--light);
}
.comparison-card--active .comparison-list li::before { background: var(--amber); }

/* Features */
.features {
  background: var(--navy); color: var(--white);
  padding: 80px 24px;
}
.features .section-eyebrow { color: var(--amber); }
.features .section-headline { color: var(--white); }
.feature-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px;
}
.feature-card { padding: 0; }
.feature-icon {
  margin-bottom: 16px;
  width: 40px; height: 40px;
}
.feature-title {
  font-family: var(--serif);
  font-size: 1.15rem; font-weight: 600;
  color: var(--white); margin-bottom: 10px;
}
.feature-desc {
  font-size: 0.9rem; line-height: 1.65;
  color: rgba(255,255,255,0.55);
}

/* Claims */
.claims { padding: 80px 24px; background: var(--cream); }
.claims-inner {
  max-width: 1100px; margin: 0 auto;
  display: grid; grid-template-columns: 1fr 1fr; gap: 64px;
}
.claims-body {
  font-size: 0.95rem; line-height: 1.75;
  color: var(--slate); margin-bottom: 20px;
}
.claims-badges {
  display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px;
}
.badge {
  display: inline-block;
  font-size: 0.72rem; font-weight: 600; letter-spacing: 0.06em;
  text-transform: uppercase;
  background: var(--navy); color: var(--amber);
  padding: 6px 14px; border-radius: 3px;
}
.ideal-list { list-style: none; }
.ideal-list li {
  font-size: 0.95rem; line-height: 1.6;
  color: var(--navy); padding: 10px 0;
  border-bottom: 1px solid var(--light);
  padding-left: 24px;
  position: relative;
}
.ideal-list li::before {
  content: ''; position: absolute; left: 0; top: 50%; transform: translateY(-50%);
  width: 10px; height: 10px;
  background: var(--amber); border-radius: 2px;
}

/* Closing */
.closing { padding: 80px 24px; }
.closing-inner { max-width: 700px; margin: 0 auto; text-align: center; }
.closing-rule {
  width: 48px; height: 3px; background: var(--amber);
  margin: 0 auto 40px; border-radius: 2px;
}
.closing-headline {
  font-family: var(--serif);
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 700;
  color: var(--navy);
  line-height: 1.15; margin-bottom: 24px;
}
.closing-body {
  font-size: 1.05rem; line-height: 1.7;
  color: var(--slate);
}

/* Footer */
.footer {
  background: var(--navy); color: var(--white);
  padding: 40px 24px;
}
.footer-inner {
  max-width: 1100px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  gap: 32px;
}
.footer-logo {
  font-family: var(--serif); font-size: 1.1rem; font-weight: 700;
  color: var(--amber); margin-bottom: 8px;
}
.footer-company {
  font-size: 0.8rem; color: rgba(255,255,255,0.4);
  line-height: 1.6;
}
.footer-right { text-align: right; }
.footer-links {
  display: flex; align-items: center; gap: 8px;
  margin-bottom: 8px;
}
.footer-links a {
  color: rgba(255,255,255,0.55); text-decoration: none;
  font-size: 0.85rem;
}
.footer-links a:hover { color: var(--amber); }
.footer-links span { color: rgba(255,255,255,0.25); }
.footer-patent {
  font-size: 0.72rem; color: rgba(255,255,255,0.25);
  letter-spacing: 0.05em;
}

/* Responsive */
@media (max-width: 768px) {
  .stats-inner {
    flex-direction: column; gap: 16px;
  }
  .stat-divider { width: 100%; height: 1px; }
  .how-body, .claims-inner, .feature-grid {
    grid-template-columns: 1fr; gap: 40px;
  }
  .hero-visual { flex-direction: column; align-items: center; padding-bottom: 40px; gap: 0; }
  .visual-ladder, .visual-guy, .visual-cable, .visual-hatch { padding: 0 0 24px; }
  .ladder-rail--left, .ladder-rail--right { height: 180px; }
  .cable-line { height: 80px; }
  .footer-inner { flex-direction: column; text-align: left; }
  .footer-right { text-align: left; }
  .footer-links { flex-wrap: wrap; }
}
@media (max-width: 480px) {
  .hero-headline { font-size: 1.75rem; }
  .section-headline { font-size: 1.4rem; }
  .closing-headline { font-size: 1.6rem; }
  .feature-grid { gap: 24px; }
}