/* Lumyna Super AI — clean, white, Apple-style, futuristic. System font stack only. */

:root {
  --bg: #ffffff;
  --bg-soft: #f6f8fa;
  --ink: #1a1a1e;
  --ink-soft: #55555e;
  --ink-faint: #8a8a94;
  --accent: #0b5378;
  --accent-glow: rgba(11, 83, 120, 0.08);
  --line: #e8eaee;
  --radius: 18px;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav {
  max-width: 1080px; margin: 0 auto; padding: 14px 24px;
  display: flex; align-items: center; gap: 32px;
}
.logo { font-weight: 800; letter-spacing: 0.22em; font-size: 15px; color: var(--ink); text-decoration: none; }
.nav-links { display: flex; gap: 24px; margin-left: auto; }
.nav-links a { color: var(--ink-soft); text-decoration: none; font-size: 14px; }
.nav-links a:hover { color: var(--ink); }

/* Buttons */
.btn {
  display: inline-block; text-decoration: none; font-weight: 600;
  border-radius: 999px; transition: transform 0.15s ease, box-shadow 0.15s ease;
  cursor: pointer; border: none; font-family: var(--font);
}
.btn-primary {
  background: var(--ink); color: #fff; padding: 14px 30px; font-size: 16px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.14);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 30px rgba(0, 0, 0, 0.18); }
.btn-secondary {
  background: #fff; color: var(--ink); padding: 14px 30px; font-size: 16px;
  border: 1px solid var(--line);
}
.btn-secondary:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08); }
.btn-light {
  background: #fff; color: var(--ink); padding: 16px 36px; font-size: 17px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
}
.btn-light:hover { transform: translateY(-2px); }
.btn-sm { padding: 9px 20px; font-size: 14px; }
.btn-lg { padding: 16px 40px; font-size: 17px; }

/* Hero */
.hero {
  text-align: center; padding: 110px 24px 90px;
  background:
    radial-gradient(600px 300px at 50% -60px, var(--accent-glow), transparent),
    var(--bg);
}
.hero-inner { max-width: 780px; margin: 0 auto; }
.eyebrow {
  text-transform: uppercase; letter-spacing: 0.3em; font-size: 12px;
  color: var(--ink-faint); margin-bottom: 18px;
}
.hero h1 {
  font-size: clamp(42px, 7vw, 76px); font-weight: 800; letter-spacing: 0.04em; line-height: 1.05;
}
.hero-tagline {
  font-size: clamp(22px, 3.4vw, 32px); font-weight: 300; color: var(--ink-soft); margin-top: 10px;
}
.hero-sub { font-size: 18px; color: var(--ink-soft); max-width: 620px; margin: 22px auto 0; }
.hero-ctas { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; margin-top: 34px; }
.hero-note { margin-top: 18px; font-size: 14px; color: var(--ink-faint); }

/* Sections */
section { padding: 84px 0; }
h2 { font-size: clamp(28px, 4vw, 40px); font-weight: 700; letter-spacing: -0.01em; text-align: center; }
.lead { text-align: center; color: var(--ink-soft); font-size: 18px; max-width: 640px; margin: 14px auto 0; }

/* Problem */
.problem { background: var(--bg-soft); }
.problem h2 { max-width: 700px; margin: 0 auto; }
.stack-chips {
  display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-top: 36px;
}
.chip {
  background: #fff; border: 1px solid var(--line); border-radius: 999px;
  padding: 12px 22px; font-size: 15px; color: var(--ink-soft);
}
.chip strong { color: var(--ink); }
.chip.total { background: var(--ink); color: #fff; border-color: var(--ink); }
.chip.total strong { color: #fff; }

/* Features */
.feature-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px; margin-top: 44px;
}
.feature-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px 24px; transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.feature-card:hover { transform: translateY(-4px); box-shadow: 0 16px 40px rgba(0, 0, 0, 0.07); }
.feature-icon {
  width: 46px; height: 46px; border-radius: 14px; display: flex; align-items: center; justify-content: center;
  background: var(--accent-glow); color: var(--accent); font-size: 22px; margin-bottom: 16px;
}
.feature-card h3 { font-size: 18px; margin-bottom: 8px; }
.feature-card p { font-size: 15px; color: var(--ink-soft); }

/* Pricing */
.pricing { background: var(--bg-soft); }
.price-card {
  max-width: 560px; margin: 40px auto 0; background: #fff; border: 1px solid var(--line);
  border-radius: 24px; padding: 44px 40px; text-align: center;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.06);
}
.price-name { font-weight: 700; letter-spacing: 0.12em; font-size: 14px; color: var(--ink-faint); text-transform: uppercase; }
.price { margin: 12px 0 6px; }
.price-amount { font-size: 56px; font-weight: 800; letter-spacing: -0.02em; }
.price-per { font-size: 18px; color: var(--ink-soft); }
.price-list { list-style: none; text-align: left; margin: 26px 0 30px; }
.price-list li { padding: 9px 0 9px 30px; position: relative; font-size: 15.5px; color: var(--ink-soft); }
.price-list li::before { content: "✓"; position: absolute; left: 4px; color: var(--accent); font-weight: 700; }
.price-list li strong { color: var(--ink); }
.price-note { margin-top: 18px; font-size: 14px; color: var(--ink-faint); }
.price-note a { color: var(--accent); }

/* Demo band */
.demo-band {
  background: linear-gradient(135deg, #0b5378, #083a55);
  color: #fff; text-align: center;
}
.demo-band h2 { color: #fff; }
.demo-band .lead { color: rgba(255, 255, 255, 0.82); }
.demo-band .btn-light { margin-top: 30px; }

/* FAQ */
.faq-list { max-width: 720px; margin: 36px auto 0; }
.faq-item {
  border: 1px solid var(--line); border-radius: 14px; margin-bottom: 12px;
  background: #fff; overflow: hidden;
}
.faq-item summary {
  padding: 20px 24px; font-weight: 600; font-size: 16px; cursor: pointer; list-style: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; float: right; color: var(--accent); font-size: 20px; line-height: 1; }
.faq-item[open] summary::after { content: "–"; }
.faq-item p { padding: 0 24px 22px; color: var(--ink-soft); font-size: 15.5px; }

/* Footer */
.site-footer { border-top: 1px solid var(--line); padding: 44px 0; text-align: center; }
.footer-logo { font-weight: 800; letter-spacing: 0.22em; font-size: 15px; }
.footer-tag { color: var(--ink-faint); font-size: 14px; margin-top: 6px; }
.footer-copy { color: var(--ink-faint); font-size: 13px; margin-top: 14px; }

@media (max-width: 640px) {
  .nav-links { display: none; }
  section { padding: 60px 0; }
  .price-card { padding: 34px 24px; }
}