:root {
  --bg: #ffffff;
  --bg-soft: #f5f7fb;
  --bg-alt: #eef2f9;
  --text: #0f1b2d;
  --muted: #55627a;
  --border: #e3e8f0;
  --primary: #1d4ed8;
  --primary-dark: #1e3a8a;
  --primary-soft: #e8efff;
  --accent: #0ea5e9;
  --success: #059669;
  --success-soft: #dcfce7;
  --shadow: 0 10px 30px rgba(15, 27, 45, 0.08);
  --radius: 14px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--text); background: var(--bg); line-height: 1.6; -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font: inherit; }
.container { width: min(1140px, 92%); margin: 0 auto; }
.section { padding: 88px 0; }
.section.alt { background: var(--bg-soft); }
.section-head { max-width: 720px; margin-bottom: 48px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.eyebrow {
  display: inline-block; font-size: 12px; font-weight: 700; letter-spacing: .12em; text-transform: uppercase;
  color: var(--primary); background: var(--primary-soft); padding: 6px 12px; border-radius: 999px; margin-bottom: 14px;
}
h1, h2, h3 { line-height: 1.2; letter-spacing: -0.01em; }
h1 { font-size: clamp(36px, 5vw, 56px); font-weight: 800; }
h2 { font-size: clamp(28px, 3.4vw, 38px); font-weight: 800; margin-bottom: 14px; }
h3 { font-size: 19px; font-weight: 700; margin-bottom: 8px; }
.lead { font-size: 18px; color: var(--muted); }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 13px 24px; border-radius: 10px;
  font-weight: 600; font-size: 15px; border: 1px solid transparent; cursor: pointer; transition: all .2s ease;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); }
.btn-outline { border-color: var(--border); background: #fff; color: var(--text); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.btn-lg { padding: 16px 30px; font-size: 16px; }
.btn-block { width: 100%; }

/* Header */
.header { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.92); backdrop-filter: blur(10px); border-bottom: 1px solid var(--border); }
.nav { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 19px; letter-spacing: -0.01em; }
.logo-mark { width: 34px; height: 34px; border-radius: 9px; display: block; }
.nav-links { display: flex; gap: 32px; list-style: none; }
.nav-links a { font-size: 15px; font-weight: 500; color: var(--muted); }
.nav-links a:hover { color: var(--primary); }
.nav-actions { display: flex; align-items: center; gap: 12px; }
.nav-toggle { display: none; width: 40px; height: 40px; border: 1px solid var(--border); border-radius: 8px; background: #fff; cursor: pointer; }
.nav-toggle span { display: block; width: 18px; height: 2px; background: var(--text); margin: 4px auto; }
.nav-cross { padding: 10px 16px; font-size: 14px; color: var(--primary); border-color: var(--primary-soft); background: var(--primary-soft); }
.nav-cross:hover { background: var(--primary); color: #fff; border-color: var(--primary); }
.nav-mobile-only { display: none; }

/* Hero */
.hero {
  padding: 96px 0 72px;
  background:
    radial-gradient(900px 400px at 85% -10%, rgba(14,165,233,.14), transparent 60%),
    radial-gradient(700px 400px at 0% 100%, rgba(29,78,216,.10), transparent 60%), var(--bg);
}
.hero-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: 56px; align-items: center; }
.hero p.lead { margin: 20px 0 32px; max-width: 560px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-trust { display: flex; gap: 22px; flex-wrap: wrap; margin-top: 28px; font-size: 14px; color: var(--muted); }
.hero-trust span::before { content: "✓ "; color: var(--success); font-weight: 800; }

/* Hero product picker card */
.picker { background: #fff; border: 1px solid var(--border); border-radius: 18px; box-shadow: var(--shadow); padding: 28px; }
.picker-tabs { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; background: var(--bg-alt); padding: 6px; border-radius: 12px; margin-bottom: 22px; }
.picker-tabs button { border: 0; background: transparent; padding: 10px; border-radius: 9px; font-weight: 700; font-size: 14px; color: var(--muted); cursor: pointer; }
.picker-tabs button.active { background: #fff; color: var(--primary); box-shadow: 0 2px 8px rgba(15,27,45,.08); }
.picker-pane { display: none; }
.picker-pane.active { display: block; }
.picker label { display: block; font-size: 12px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); margin: 14px 0 8px; }
.picker select, .picker input[type=range] { width: 100%; }
.picker select { padding: 12px 14px; border: 1px solid var(--border); border-radius: 10px; font-size: 15px; background: #fff; }
.picker input[type=range] { accent-color: var(--primary); margin: 6px 0; }
.picker-out { display: flex; justify-content: space-between; align-items: baseline; padding: 18px 0 6px; border-top: 1px solid var(--border); margin-top: 18px; }
.picker-out .total { font-size: 34px; font-weight: 800; letter-spacing: -0.02em; }
.picker-out .rate { font-size: 14px; color: var(--muted); }
.picker .btn { margin-top: 14px; }
.picker-note { font-size: 12px; color: var(--muted); margin-top: 10px; text-align: center; }

/* Stats bar */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.stat { padding: 22px 24px; border: 1px solid var(--border); border-radius: var(--radius); background: #fff; }
.stat b { display: block; font-size: 30px; font-weight: 800; color: var(--primary); letter-spacing: -0.02em; }
.stat span { font-size: 14px; color: var(--muted); }

/* Grids & cards */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; transition: transform .2s, box-shadow .2s; }
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.card p { color: var(--muted); font-size: 15px; }
.card-icon { width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center; margin-bottom: 18px; background: var(--primary-soft); color: var(--primary); font-size: 20px; font-weight: 800; }

/* Product cards */
.product { position: relative; padding: 36px; display: flex; flex-direction: column; }
.product .badge { position: absolute; top: 20px; right: 20px; font-size: 11px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--primary); background: var(--primary-soft); padding: 5px 10px; border-radius: 999px; }
.product h3 { font-size: 24px; margin-bottom: 4px; }
.product .sub { color: var(--muted); margin-bottom: 18px; }
.product .from { display: flex; align-items: baseline; gap: 6px; margin-bottom: 20px; }
.product .from b { font-size: 36px; font-weight: 800; letter-spacing: -0.02em; }
.product .from span { color: var(--muted); font-size: 14px; }
.check-list { list-style: none; display: grid; gap: 12px; margin-bottom: 26px; }
.check-list li { display: flex; gap: 12px; align-items: flex-start; font-size: 15px; }
.check-list li::before { content: "✓"; flex: none; width: 22px; height: 22px; border-radius: 50%; display: grid; place-items: center; background: var(--success-soft); color: var(--success); font-size: 12px; font-weight: 800; margin-top: 2px; }
.product .btn { margin-top: auto; }

/* Pricing tables */
.pricing-tabs { display: inline-flex; gap: 6px; background: var(--bg-alt); padding: 6px; border-radius: 12px; margin: 0 auto 36px; }
.pricing-tabs button { border: 0; background: transparent; padding: 10px 22px; border-radius: 9px; font-weight: 700; font-size: 14px; color: var(--muted); cursor: pointer; }
.pricing-tabs button.active { background: #fff; color: var(--primary); box-shadow: 0 2px 8px rgba(15,27,45,.08); }
.pricing-pane { display: none; }
.pricing-pane.active { display: block; }
.tier-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; }
.tier { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 22px 20px; text-align: center; position: relative; transition: transform .2s, box-shadow .2s, border-color .2s; }
.tier:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--primary); }
.tier.featured { border: 2px solid var(--primary); }
.tier .tag { position: absolute; top: -11px; left: 50%; transform: translateX(-50%); font-size: 11px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: #fff; background: var(--primary); padding: 4px 10px; border-radius: 999px; white-space: nowrap; }
.tier .vol { font-size: 15px; font-weight: 700; color: var(--muted); }
.tier .unit { font-size: 30px; font-weight: 800; letter-spacing: -0.02em; margin: 8px 0 2px; }
.tier .unit small { font-size: 13px; font-weight: 600; color: var(--muted); }
.tier .total { font-size: 14px; color: var(--muted); margin-bottom: 16px; }
.tier .btn { width: 100%; padding: 10px; font-size: 14px; }
.tier .save { display: inline-block; margin-top: 6px; font-size: 12px; color: var(--success); font-weight: 700; }
.pricing-note { margin-top: 24px; text-align: center; color: var(--muted); font-size: 14px; }

/* Mbps table */
.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); background: #fff; }
table { width: 100%; border-collapse: collapse; font-size: 15px; }
th, td { padding: 16px 18px; text-align: center; border-bottom: 1px solid var(--border); }
th:first-child, td:first-child { text-align: left; font-weight: 700; }
th { background: var(--bg-alt); font-weight: 700; font-size: 13px; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }
tr:last-child td { border-bottom: none; }
td b { color: var(--primary); }
td.hl { background: var(--primary-soft); }

/* Steps */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.step { padding: 28px 24px; background: #fff; border: 1px solid var(--border); border-radius: var(--radius); }
.step-num { font-size: 13px; font-weight: 800; letter-spacing: .1em; color: var(--primary); margin-bottom: 12px; }
.step p { color: var(--muted); font-size: 15px; }

/* Code */
pre { background: #0f1b2d; color: #e6edf7; border-radius: 12px; padding: 20px 22px; font-family: "SF Mono", Menlo, Consolas, monospace; font-size: 13px; line-height: 1.7; overflow-x: auto; }
pre .c { color: #7b8ba3; }
pre .k { color: #7dd3fc; }
pre .s { color: #a7f3d0; }

/* FAQ */
.faq { display: grid; gap: 12px; }
.faq-item { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 0 24px; transition: border-color .2s, box-shadow .2s; }
.faq-item[open] { border-color: var(--primary); box-shadow: 0 4px 16px rgba(29,78,216,.08); }
.faq-item summary { cursor: pointer; list-style: none; padding: 20px 0; display: flex; justify-content: space-between; align-items: center; gap: 16px; font-size: 17px; font-weight: 700; color: var(--text); }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; flex: none; width: 28px; height: 28px; border-radius: 50%; display: grid; place-items: center; background: var(--primary-soft); color: var(--primary); font-size: 18px; font-weight: 800; }
.faq-item[open] summary { color: var(--primary); }
.faq-item[open] summary::after { content: "–"; background: var(--primary); color: #fff; }
.faq-item p { margin: 0 0 20px; padding: 16px 18px; border-left: 3px solid var(--primary); border-radius: 0 10px 10px 0; background: var(--bg-soft); color: var(--muted); font-size: 15px; line-height: 1.7; }

/* Contact / CTA */
.contact { background: linear-gradient(135deg, var(--primary-dark), var(--primary) 60%, var(--accent)); color: #fff; border-radius: 22px; padding: 64px 56px; display: grid; grid-template-columns: 1.2fr 1fr; gap: 48px; align-items: center; }
.contact h2 { color: #fff; }
.contact p { color: rgba(255,255,255,.85); font-size: 17px; }
.contact-cards { display: grid; gap: 14px; }
.contact-card { display: flex; align-items: center; gap: 16px; padding: 18px 20px; border-radius: 14px; background: rgba(255,255,255,.12); border: 1px solid rgba(255,255,255,.25); transition: background .2s; }
.contact-card:hover { background: rgba(255,255,255,.2); }
.contact-icon { width: 44px; height: 44px; border-radius: 10px; background: #fff; color: var(--primary); display: grid; place-items: center; font-weight: 800; font-size: 14px; flex: none; }
.contact-card small { display: block; font-size: 12px; letter-spacing: .08em; text-transform: uppercase; opacity: .8; }
.contact-card b { font-size: 16px; word-break: break-all; }

/* Footer */
.footer { padding: 40px 0; border-top: 1px solid var(--border); color: var(--muted); font-size: 14px; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; gap: 20px; flex-wrap: wrap; }
.footer-links { display: flex; gap: 22px; }
.footer-links a:hover { color: var(--primary); }

/* Responsive */
@media (max-width: 960px) {
  .hero-grid { grid-template-columns: 1fr; }
  .grid-3, .grid-4, .steps, .stats { grid-template-columns: repeat(2, 1fr); }
  .tier-grid { grid-template-columns: repeat(3, 1fr); }
  .contact { grid-template-columns: 1fr; padding: 48px 32px; }
  .nav-links { display: none; position: absolute; top: 72px; left: 0; right: 0; background: #fff; border-bottom: 1px solid var(--border); flex-direction: column; gap: 0; padding: 12px 4%; }
  .nav-links.open { display: flex; }
  .nav-links a { display: block; padding: 14px 0; border-bottom: 1px solid var(--border); }
  .nav-toggle { display: block; }
  .nav-actions .btn { display: none; }
  .nav-mobile-only { display: block; }
  .nav-mobile-only a { color: var(--primary); font-weight: 700; }
}
@media (max-width: 640px) {
  .section { padding: 64px 0; }
  .hero { padding: 56px 0 48px; }
  .grid-2, .grid-3, .grid-4, .steps, .stats { grid-template-columns: 1fr; }
  .tier-grid { grid-template-columns: repeat(2, 1fr); }
  .contact { padding: 40px 24px; }
  .picker { padding: 22px; }
}