/* PlanetHub Co., Ltd. — corporate site */
:root {
  --primary: #2563EB;
  --primary-dark: #1D4ED8;
  --secondary: #10B981;
  --text: #111827;
  --subtext: #6B7280;
  --bg: #FFFFFF;
  --bg-alt: #F6F8FC;
  --border: #E5E7EB;
  --maxw: 1080px;
  --radius: 16px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo",
    "Pretendard", "Malgun Gothic", "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,0.85);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-text strong { font-size: 16px; }
.brand-text small { font-size: 11px; color: var(--subtext); letter-spacing: .02em; }
.nav { display: flex; gap: 28px; font-size: 15px; }
.nav a { color: var(--subtext); font-weight: 500; transition: color .15s; }
.nav a:hover { color: var(--text); }

/* Hero */
.hero {
  padding: 96px 0 88px;
  background:
    radial-gradient(1000px 500px at 15% -10%, rgba(37,99,235,.10), transparent 60%),
    radial-gradient(900px 500px at 100% 0%, rgba(16,185,129,.10), transparent 55%);
}
.eyebrow { color: var(--primary); font-weight: 700; font-size: 13px; letter-spacing: .12em; margin: 0 0 18px; }
.hero h1 { font-size: clamp(34px, 6vw, 60px); line-height: 1.12; margin: 0 0 24px; letter-spacing: -.02em; }
.lead { font-size: clamp(16px, 2.2vw, 20px); color: var(--subtext); max-width: 620px; margin: 0 0 34px; }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center;
  padding: 13px 26px; border-radius: 999px; font-weight: 600; font-size: 15px;
  transition: transform .12s, box-shadow .15s, background .15s; }
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 8px 20px rgba(37,99,235,.28); }
.btn-primary:hover { background: var(--primary-dark); }
.btn-ghost { background: #fff; color: var(--text); border: 1px solid var(--border); }
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); }
.btn-lg { padding: 16px 34px; font-size: 17px; }

/* Sections */
.section { padding: 80px 0; }
.section-alt { background: var(--bg-alt); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section-title { font-size: 28px; margin: 0 0 40px; display: flex; align-items: baseline; gap: 12px; letter-spacing: -.01em; }
.section-title span { font-size: 15px; color: var(--subtext); font-weight: 500; }

/* About */
.about-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: 48px; align-items: start; }
.about-lead { font-size: 18px; color: var(--text); margin: 0; }
.facts { margin: 0; display: grid; gap: 14px; }
.facts div { display: grid; grid-template-columns: 120px 1fr; gap: 12px; padding-bottom: 12px; border-bottom: 1px solid var(--border); }
.facts dt { color: var(--subtext); font-size: 14px; font-weight: 600; margin: 0; }
.facts dd { margin: 0; font-size: 15px; }
.facts a { color: var(--primary); }

/* Products */
.products { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.product-card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px; border-top: 4px solid var(--accent);
  transition: box-shadow .18s, transform .18s;
}
.product-card:hover { box-shadow: 0 16px 40px rgba(17,24,39,.08); transform: translateY(-2px); }
.product-head h3 { margin: 0 0 4px; font-size: 22px; }
.product-tagline { margin: 0 0 16px; color: var(--accent); font-weight: 600; font-size: 14px; }
.product-desc { margin: 0 0 8px; color: var(--text); font-size: 15px; }
.product-desc.en { color: var(--subtext); font-size: 13.5px; margin-bottom: 20px; }
.product-links { display: flex; flex-wrap: wrap; gap: 10px; }
.product-links a {
  font-size: 13px; font-weight: 600; color: var(--accent);
  border: 1px solid var(--border); border-radius: 999px; padding: 7px 15px;
  transition: background .15s, border-color .15s;
}
.product-links a:hover { background: color-mix(in srgb, var(--accent) 10%, #fff); border-color: var(--accent); }

/* Contact */
.contact { text-align: center; }
.contact-lead { color: var(--subtext); font-size: 17px; margin: 0 0 28px; }
.contact-address { font-style: normal; color: var(--subtext); font-size: 14px; margin-top: 28px; }

/* Footer */
.site-footer { background: #0F172A; color: #CBD5E1; padding: 44px 0; font-size: 14px; }
.footer-inner { display: grid; gap: 14px; }
.footer-inner strong { color: #fff; }
.footer-meta { color: #94A3B8; line-height: 1.7; }
.footer-meta a { color: #93C5FD; }
.footer-copy { color: #64748B; font-size: 13px; margin-top: 6px; }

/* Responsive */
@media (max-width: 820px) {
  .nav { display: none; }
  .about-grid, .products { grid-template-columns: 1fr; gap: 28px; }
  .hero { padding: 64px 0 56px; }
  .section { padding: 56px 0; }
}