/* 人间副本 · 官网共用样式 */
:root {
  --bg: #f4f7fa;
  --bg-deep: #e8eef5;
  --ink: #0a1f33;
  --muted: #5a6b7d;
  --line: #d7e0ea;
  --brand: #0a3663;
  --brand-soft: #134a82;
  --mint: #00c887;
  --card: #ffffff;
  --shadow: 0 18px 50px rgba(10, 54, 99, 0.08);
  --radius: 18px;
  --max: 920px;
  --font: "Sora", "Noto Sans SC", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(1200px 500px at 10% -10%, rgba(0, 200, 135, 0.12), transparent 55%),
    radial-gradient(900px 420px at 100% 0%, rgba(10, 54, 99, 0.12), transparent 50%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-deep) 100%);
  min-height: 100vh;
  line-height: 1.65;
}

a { color: var(--brand-soft); text-decoration-thickness: 1px; }
a:hover { color: var(--mint); }

.wrap {
  width: min(100% - 32px, var(--max));
  margin: 0 auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 0 8px;
  gap: 16px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: inherit;
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.mark {
  width: 36px;
  height: 36px;
  border-radius: 12px;
  background: linear-gradient(145deg, var(--brand), #062442);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 800;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.12);
}
.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 18px;
  font-size: 14px;
}
.nav a { color: var(--muted); text-decoration: none; }
.nav a:hover, .nav a.active { color: var(--brand); }

.hero {
  padding: 48px 0 28px;
}
.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--brand);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.hero-kicker::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--mint);
  box-shadow: 0 0 0 4px rgba(0, 200, 135, 0.18);
}
.hero h1 {
  margin: 14px 0 12px;
  font-size: clamp(2rem, 5vw, 3.2rem);
  line-height: 1.15;
  letter-spacing: -0.03em;
  max-width: 14ch;
}
.hero p.lead {
  margin: 0;
  max-width: 36em;
  color: var(--muted);
  font-size: 1.05rem;
}
.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 18px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 600;
  font-size: 14px;
  text-decoration: none;
  cursor: pointer;
}
.btn-primary {
  background: var(--brand);
  color: #fff;
}
.btn-primary:hover { background: var(--brand-soft); color: #fff; }
.btn-ghost {
  background: rgba(255,255,255,0.7);
  border-color: var(--line);
  color: var(--brand);
}
.btn-ghost:hover { border-color: var(--brand); color: var(--brand); }

.panel {
  background: var(--card);
  border: 1px solid rgba(215, 224, 234, 0.9);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px 28px 24px;
  margin: 18px 0;
}
.panel h2 {
  margin: 0 0 10px;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}
.panel p { margin: 0 0 10px; color: var(--muted); }
.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin: 22px 0 8px;
}
@media (max-width: 760px) {
  .grid { grid-template-columns: 1fr; }
}
.card {
  background: linear-gradient(180deg, #fff, #f8fbfe);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 18px 16px;
}
.card strong {
  display: block;
  margin-bottom: 6px;
  color: var(--brand);
}
.card span { color: var(--muted); font-size: 14px; }

.doc {
  padding: 28px 0 64px;
}
.doc h1 {
  margin: 8px 0 6px;
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  letter-spacing: -0.02em;
}
.meta {
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 22px;
}
.doc h2 {
  margin: 28px 0 10px;
  font-size: 1.15rem;
  color: var(--brand);
}
.doc h3 {
  margin: 18px 0 8px;
  font-size: 1rem;
}
.doc p, .doc li { color: var(--muted); }
.doc ul { padding-left: 1.2em; }
.doc li { margin: 6px 0; }

.site-footer {
  padding: 28px 0 40px;
  color: var(--muted);
  font-size: 13px;
  border-top: 1px solid rgba(215, 224, 234, 0.7);
  margin-top: 24px;
}
.site-footer .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  justify-content: space-between;
}
.site-footer nav { display: flex; gap: 14px; flex-wrap: wrap; }
.site-footer a { color: var(--muted); text-decoration: none; }
.site-footer a:hover { color: var(--brand); }

.contact-box {
  display: grid;
  gap: 10px;
  margin-top: 8px;
}
.contact-box a.mail {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--brand);
  text-decoration: none;
}
.faq details {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 14px;
  margin: 10px 0;
  background: #fff;
}
.faq summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--brand);
}
.faq p { margin: 10px 0 0; }