:root {
  --bg: #0b1220;
  --bg-card: #121c2e;
  --bg-light: #f4f7fb;
  --text: #e8eef7;
  --text-muted: #94a3b8;
  --primary: #38bdf8;
  --primary-dark: #0ea5e9;
  --accent: #6366f1;
  --border: rgba(148, 163, 184, 0.18);
  --shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
  --radius: 12px;
  --nav-h: 72px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

a { color: inherit; text-decoration: none; }

img { max-width: 100%; display: block; }

.container {
  width: min(1120px, 92vw);
  margin: 0 auto;
}

/* 调试阶段提示条 */
.debug-banner {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1001;
  background: linear-gradient(90deg, rgba(245, 158, 11, 0.18), rgba(56, 189, 248, 0.12));
  border-bottom: 1px solid rgba(245, 158, 11, 0.35);
  color: #fde68a;
  text-align: center;
  font-size: 0.82rem;
  padding: 8px 16px;
  line-height: 1.45;
}

body.has-debug-banner .site-header {
  top: var(--debug-banner-h, 40px);
}

body.has-debug-banner .hero,
body.has-debug-banner .form-page,
body.has-debug-banner .legal-page {
  padding-top: calc(var(--nav-h) + var(--debug-banner-h, 40px) + 48px);
}

body.has-debug-banner .form-page {
  padding-top: calc(var(--nav-h) + var(--debug-banner-h, 40px) + 32px);
}

body.has-debug-banner .legal-page {
  padding-top: calc(var(--nav-h) + var(--debug-banner-h, 40px) + 24px);
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-h);
  background: rgba(11, 18, 32, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.logo-icon {
  height: 46px;
  width: auto;
  flex-shrink: 0;
  filter: drop-shadow(0 2px 8px rgba(56, 189, 248, 0.25));
}

.logo-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  line-height: 1.2;
}

.logo-name {
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.04em;
  background: linear-gradient(90deg, #38bdf8, #818cf8);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  white-space: nowrap;
}

.logo-sub {
  font-size: 0.68rem;
  color: var(--text-muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  white-space: nowrap;
}

.nav { display: flex; gap: 20px; align-items: center; }

.nav a {
  font-size: 0.92rem;
  color: var(--text-muted);
  transition: color 0.2s;
}

.nav a:hover, .nav a.active { color: var(--primary); }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 6px 10px;
  border-radius: 8px;
  cursor: pointer;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border-radius: 999px;
  border: none;
  cursor: pointer;
  font-size: 0.92rem;
  transition: all 0.2s;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
}

.btn-primary:hover { opacity: 0.9; transform: translateY(-1px); }

.btn-outline {
  background: transparent;
  border: 1px solid var(--primary);
  color: var(--primary);
}

.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

/* Hero */
.hero {
  padding: calc(var(--nav-h) + 64px) 0 72px;
  background: radial-gradient(ellipse at 30% 0%, rgba(56, 189, 248, 0.15), transparent 55%),
              radial-gradient(ellipse at 80% 20%, rgba(99, 102, 241, 0.12), transparent 50%);
}

.hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  line-height: 1.25;
  margin-bottom: 16px;
}

.hero p {
  color: var(--text-muted);
  max-width: 640px;
  font-size: 1.05rem;
}

.hero-actions { margin-top: 28px; display: flex; gap: 12px; flex-wrap: wrap; }

/* Sections */
.section { padding: 64px 0; }

.section-title {
  font-size: 1.6rem;
  margin-bottom: 8px;
}

.section-desc {
  color: var(--text-muted);
  margin-bottom: 32px;
}

.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}

.card h3 { font-size: 1.1rem; margin-bottom: 10px; color: var(--primary); }

.card p { color: var(--text-muted); font-size: 0.92rem; }

.card-img {
  width: 100%;
  height: 160px;
  object-fit: cover;
  border-radius: 8px;
  margin-bottom: 14px;
  background: rgba(56, 189, 248, 0.08);
}

.tag {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 0.75rem;
  background: rgba(56, 189, 248, 0.15);
  color: var(--primary);
  margin-bottom: 8px;
}

/* Solution blocks */
.track-block {
  margin-bottom: 40px;
  padding: 28px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.track-block h3 { color: var(--primary); margin-bottom: 16px; font-size: 1.2rem; }

.track-block ul { list-style: none; }

.track-block li {
  padding: 8px 0;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
}

.track-block li:last-child { border-bottom: none; }

.track-block li strong { color: var(--text); }

/* Form */
.form-page { padding: calc(var(--nav-h) + 48px) 0 80px; }

.form-card {
  max-width: 560px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
}

.form-group { margin-bottom: 20px; }

.form-group label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.9rem;
}

.form-group label.required::after { content: " *"; color: #f87171; }

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 10px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.2);
  color: var(--text);
  font-size: 0.95rem;
}

.form-group textarea { min-height: 120px; resize: vertical; }

.form-tip { font-size: 0.8rem; color: var(--text-muted); margin-top: 4px; }

/* 蜜罐字段：对用户隐藏 */
.hp-field {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
  opacity: 0;
  pointer-events: none;
}

/* CTA bar */
.cta-bar {
  background: linear-gradient(90deg, rgba(56, 189, 248, 0.12), rgba(99, 102, 241, 0.12));
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 32px 0;
}

.cta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

/* Footer */
.site-footer {
  padding: 40px 0 24px;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer-links {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.footer-links a:hover { color: var(--primary); }

.footer-copy { opacity: 0.8; }

/* Modal */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: 2000;
  align-items: center;
  justify-content: center;
}

.modal-overlay.show { display: flex; }

.modal-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  max-width: 400px;
  width: 90%;
  text-align: center;
}

.modal-box h3 { margin-bottom: 12px; color: var(--primary); }

/* Legal pages */
.legal-page {
  padding: calc(var(--nav-h) + 40px) 0 60px;
}

.legal-page h1 { margin-bottom: 24px; }

.legal-page h2 { margin: 24px 0 12px; font-size: 1.1rem; color: var(--primary); }

.legal-page p, .legal-page li { color: var(--text-muted); margin-bottom: 10px; }

.legal-page ul { padding-left: 20px; }

/* Loading */
.loading { text-align: center; padding: 40px; color: var(--text-muted); }

.empty { text-align: center; padding: 40px; color: var(--text-muted); }

@media (max-width: 768px) {
  .nav-toggle { display: block; }

  .nav {
    display: none;
    position: absolute;
    top: var(--nav-h);
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 16px;
  }

  .nav.open { display: flex; }

  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }

  .hero { padding-top: calc(var(--nav-h) + 40px); }

  .logo-icon { height: 38px; }

  .logo-sub { display: none; }

  .logo-name { font-size: 1rem; }
}