:root {
  --bg: #0f172a;
  --bg-2: #111827;
  --text: #172033;
  --muted: #5b6678;
  --line: #d8dde8;
  --panel: #ffffff;
  --soft: #f4f6fa;
  --accent: #1d4ed8;
  --accent-dark: #1e40af;
  --white: #ffffff;
  --radius: 14px;
  --shadow: 0 18px 45px rgba(15, 23, 42, 0.12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--text);
  background: var(--white);
  line-height: 1.6;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.container { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(8px);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; min-height: 72px; gap: 24px; }
.brand { display: flex; align-items: center; gap: 12px; color: var(--text); }
.brand:hover { text-decoration: none; }
.brand-mark { display: grid; place-items: center; width: 46px; height: 46px; border-radius: 12px; background: var(--accent); color: var(--white); font-weight: 700; }
.brand small { display: block; color: var(--muted); font-size: 0.82rem; margin-top: -2px; }
.site-nav { display: flex; align-items: center; gap: 20px; font-size: 0.95rem; }
.site-nav a { color: var(--text); }
.nav-toggle { display: none; font-size: 1.5rem; border: 0; background: transparent; cursor: pointer; }

.button { display: inline-block; background: var(--accent); color: var(--white) !important; padding: 0.82rem 1.05rem; border-radius: 10px; font-weight: 700; }
.button:hover { background: var(--accent-dark); text-decoration: none; }
.button.secondary { background: #e8eefc; color: var(--accent-dark) !important; }
.button.small { padding: 0.55rem 0.78rem; }

.hero { background: linear-gradient(135deg, var(--bg), var(--bg-2)); color: var(--white); padding: 86px 0; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(280px, 0.65fr); gap: 42px; align-items: center; }
.hero h1, .page-hero h1 { font-size: clamp(2.1rem, 5vw, 4.2rem); line-height: 1.05; margin: 0 0 20px; letter-spacing: -0.04em; }
.lead { font-size: 1.2rem; color: #dbe3f2; max-width: 760px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
.hero-card { background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.18); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); }
.hero-card h2 { margin-top: 0; }
.check-list { padding-left: 1.2rem; }
.check-list li { margin: 0.35rem 0; }

.eyebrow { color: var(--accent); text-transform: uppercase; letter-spacing: 0.12em; font-size: 0.78rem; font-weight: 700; }
.hero .eyebrow { color: #93c5fd; }
.section { padding: 72px 0; }
.section.muted { background: var(--soft); }
.section-heading { max-width: 780px; margin-bottom: 28px; }
.section h2 { font-size: clamp(1.7rem, 3vw, 2.6rem); line-height: 1.15; margin: 0 0 14px; letter-spacing: -0.03em; }
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.card, .panel, .contact-card, .file-card, .notice { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); }
.card h3, .panel h3, .file-card h2 { margin-top: 0; }
.two-column { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: start; }
.steps { list-style: none; padding: 0; margin: 0; counter-reset: step; }
.steps li { counter-increment: step; display: grid; grid-template-columns: 44px 1fr; gap: 14px; padding: 18px 0; border-bottom: 1px solid var(--line); }
.steps li::before { content: counter(step); display: grid; place-items: center; width: 38px; height: 38px; border-radius: 50%; background: var(--accent); color: var(--white); font-weight: 700; }
.steps span { display: block; color: var(--muted); }
.contact-section { background: var(--bg); }
.contact-card { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.contact-details p { margin: 0 0 10px; }
.page-hero { background: var(--bg); color: var(--white); padding: 72px 0; }
.notice { margin-bottom: 24px; background: #fff7ed; border-color: #fed7aa; box-shadow: none; }
.file-list { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
pre { white-space: pre-wrap; background: #0b1020; color: #e5e7eb; padding: 14px; border-radius: 10px; overflow-x: auto; }
code { font-family: Consolas, Monaco, monospace; }
.site-footer { background: #07101f; color: #dbe3f2; padding: 24px 0; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.site-footer a { color: #bfdbfe; }

@media (max-width: 880px) {
  .nav-toggle { display: block; }
  .site-nav { display: none; position: absolute; left: 0; right: 0; top: 72px; background: var(--white); border-bottom: 1px solid var(--line); padding: 18px 20px; flex-direction: column; align-items: flex-start; }
  .site-nav.open { display: flex; }
  .hero-grid, .two-column, .contact-card, .file-list { grid-template-columns: 1fr; }
  .cards { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 620px) {
  .container { width: min(100% - 28px, 1120px); }
  .cards { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}