:root {
  --nav-dark: #0a1628;
  --nav-glass: rgba(10, 22, 40, 0.95);
  --primary: #3b82f6;
  --primary-dark: #2563eb;
  --hero-from: #0f2744;
  --hero-to: #1e3a5f;
  --text: #0f172a;
  --text-muted: #64748b;
  --bg: #ffffff;
  --bg-soft: #f8fafc;
  --border: #e2e8f0;
  --risk-high: #ef4444;
  --risk-mid: #f97316;
  --risk-low: #10b981;
  --shadow: 0 10px 40px rgba(15, 23, 42, 0.12);
  --radius: 12px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.container { width: min(1200px, 92vw); margin: 0 auto; }
.muted { color: var(--text-muted); }
.page-main { min-height: calc(100vh - 180px); }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; padding: 0 4vw; height: 70px;
  background: var(--nav-glass); color: #fff;
  backdrop-filter: blur(10px); border-bottom: 1px solid rgba(255,255,255,.08);
}
.brand { display: flex; align-items: center; gap: 12px; color: #fff; }
.brand-icon {
  width: 36px; height: 36px; border-radius: 8px;
  background: linear-gradient(135deg, var(--primary), #60a5fa);
  display: grid; place-items: center; font-weight: 700; font-size: 13px;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-text small { opacity: .75; font-size: 11px; }
.nav-main { display: flex; gap: 8px; flex-wrap: wrap; }
.nav-link {
  padding: 8px 12px; border-radius: 8px; font-size: 14px; opacity: .85;
}
.nav-link:hover, .nav-link.active { background: rgba(255,255,255,.1); opacity: 1; }
.header-actions { display: flex; gap: 8px; align-items: center; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 22px; border-radius: 10px; border: none; cursor: pointer;
  font-weight: 600; font-size: 15px; transition: .2s;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-ghost { background: transparent; color: #fff; border: 1px solid rgba(255,255,255,.35); }
.btn-ghost:hover { background: rgba(255,255,255,.08); }
.btn-sm { padding: 8px 14px; font-size: 13px; }
.btn-block { width: 100%; }

/* Hero */
.hero {
  background: radial-gradient(circle at 20% 20%, #1d4ed8 0%, transparent 40%),
    linear-gradient(135deg, var(--hero-from), var(--hero-to));
  color: #fff; padding: 72px 0 88px;
}
.hero-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 40px; align-items: center; }
.hero h1 { font-size: clamp(28px, 4vw, 44px); line-height: 1.25; margin-bottom: 16px; }
.hero p.lead { font-size: 18px; opacity: .9; margin-bottom: 12px; }
.hero .cta { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 24px; }
.preview-card {
  background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.12);
  border-radius: 16px; padding: 20px; box-shadow: var(--shadow);
}
.preview-card h3 { margin-bottom: 14px; font-size: 16px; }
.risk-item {
  padding: 12px 14px; border-radius: 10px; margin-bottom: 10px; font-size: 14px;
  border-left: 4px solid;
}
.risk-high { background: rgba(239,68,68,.15); border-color: var(--risk-high); }
.risk-mid { background: rgba(249,115,22,.15); border-color: var(--risk-mid); }
.risk-low { background: rgba(16,185,129,.15); border-color: var(--risk-low); }

/* Sections */
.section { padding: 64px 0; }
.section.soft { background: var(--bg-soft); }
.section-title { text-align: center; margin-bottom: 36px; }
.section-title h2 { font-size: 30px; margin-bottom: 8px; }
.cards-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px; box-shadow: 0 4px 20px rgba(15,23,42,.04);
}
.card h3 { margin-bottom: 10px; }
.card p { color: var(--text-muted); font-size: 14px; }

/* Page hero */
.page-hero {
  background: linear-gradient(135deg, var(--hero-from), var(--hero-to));
  color: #fff; padding: 48px 0;
}
.page-hero h1 { font-size: 32px; margin-bottom: 8px; }
.page-hero p { opacity: .9; }

/* Upload */
.upload-zone {
  border: 2px dashed #93c5fd; background: #eff6ff; border-radius: 16px;
  padding: 48px 24px; text-align: center; cursor: pointer; transition: .2s;
}
.upload-zone:hover, .upload-zone.dragover { border-color: var(--primary); background: #dbeafe; }
.upload-zone h3 { margin-bottom: 8px; }
.upload-zone input { display: none; }

/* Forms */
.form-card {
  max-width: 480px; margin: 0 auto; background: #fff;
  border: 1px solid var(--border); border-radius: 16px; padding: 32px;
  box-shadow: var(--shadow);
}
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 14px; margin-bottom: 6px; font-weight: 600; }
.form-group input, .form-group textarea, .form-group select {
  width: 100%; padding: 12px 14px; border: 1px solid var(--border);
  border-radius: 10px; font-size: 15px;
}
.tabs { display: flex; gap: 8px; margin-bottom: 20px; }
.tab {
  flex: 1; padding: 10px; border: 1px solid var(--border); background: #fff;
  border-radius: 10px; cursor: pointer; font-weight: 600;
}
.tab.active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* Results */
.result-panel {
  margin-top: 24px; border: 1px solid var(--border); border-radius: 16px;
  padding: 24px; background: #fff;
}
.badge {
  display: inline-block; padding: 4px 10px; border-radius: 999px;
  font-size: 12px; font-weight: 600;
}
.badge-pending { background: #fef3c7; color: #b45309; }
.badge-ready { background: #d1fae5; color: #047857; }
.field-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin-top: 16px; }
.field-item { background: var(--bg-soft); padding: 12px; border-radius: 10px; font-size: 14px; }
.field-item strong { display: block; font-size: 12px; color: var(--text-muted); margin-bottom: 4px; }
.summary-text { white-space: pre-wrap; font-size: 14px; line-height: 1.7; margin-top: 12px; }

/* Loading overlay */
.loading-overlay {
  position: fixed; inset: 0; background: rgba(10,22,40,.55);
  display: none; place-items: center; z-index: 200;
}
.loading-overlay.show { display: grid; }
.loading-box {
  background: #fff; padding: 28px 36px; border-radius: 16px; text-align: center;
  max-width: 360px; box-shadow: var(--shadow);
}
.spinner {
  width: 40px; height: 40px; border: 4px solid #e2e8f0;
  border-top-color: var(--primary); border-radius: 50%;
  animation: spin .8s linear infinite; margin: 0 auto 16px;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Table */
.table { width: 100%; border-collapse: collapse; margin-top: 16px; }
.table th, .table td { padding: 12px; border-bottom: 1px solid var(--border); text-align: left; font-size: 14px; }
.table th { color: var(--text-muted); font-weight: 600; }

/* Footer */
.site-footer {
  background: var(--nav-dark); color: rgba(255,255,255,.85);
  padding: 48px 4vw 24px; margin-top: 48px;
}
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 24px; max-width: 1200px; margin: 0 auto 24px;
}
.site-footer a { display: block; margin-top: 6px; opacity: .8; }
.site-footer a:hover { opacity: 1; }
.footer-bottom, .footer-disclaimer {
  max-width: 1200px; margin: 12px auto 0; font-size: 13px; opacity: .7;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px;
}

@media (max-width: 900px) {
  .hero-grid, .cards-3, .footer-grid, .field-grid { grid-template-columns: 1fr; }
  .nav-main { display: none; }
}