:root {
  --primary: #22d3ee;
  --accent: #fb923c;
  --bg: #0f172a;
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --border-color: rgba(34, 211, 238, 0.3);
  --card-bg: rgba(255, 255, 255, 0.03);
}

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

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.7;
  overflow-x: hidden;
}

h1, h2, h3, h4, .navbar-brand {
  font-family: 'Inter', sans-serif;
  font-weight: 800;
  letter-spacing: -0.02em;
}

/* 顶部导航 */
.navbar-custom {
  background: rgba(15, 23, 42, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: 0.8rem 0;
  transition: all 0.3s ease;
}

.navbar-custom .navbar-brand {
  font-size: 1.6rem;
  font-weight: 900;
  color: var(--primary) !important;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  text-decoration: none;
}

.navbar-custom .nav-link {
  color: var(--text) !important;
  font-weight: 500;
  margin: 0 0.6rem;
  font-size: 0.95rem;
  transition: color 0.3s;
}

.navbar-custom .nav-link:hover {
  color: var(--primary) !important;
}

.navbar-toggler {
  border-color: var(--border-color);
  color: var(--text);
}

.navbar-toggler:focus { box-shadow: none; }

/* Hero 区块 */
.hero-section {
  min-height: 92vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 6rem 1.5rem 4rem;
  border-bottom: 1px solid var(--border-color);
  position: relative;
}

.hero-stats {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 3rem;
  margin-bottom: 2.5rem;
}

.stat-item {
  text-align: center;
}

.stat-number {
  font-size: 4rem;
  font-weight: 900;
  color: var(--primary);
  line-height: 1;
  display: block;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-top: 0.5rem;
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 900;
  margin-bottom: 1.2rem;
  color: var(--text);
}

.hero-title span {
  color: var(--primary);
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 650px;
  margin: 0 auto 2.5rem;
}

.hero-cta {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn-custom {
  padding: 0.8rem 2.2rem;
  font-weight: 600;
  border-radius: 50px;
  border: 2px solid var(--primary);
  color: var(--primary);
  background: transparent;
  transition: all 0.3s;
  text-decoration: none;
}

.btn-custom:hover {
  background: var(--primary);
  color: var(--bg);
}

.btn-accent {
  border-color: var(--accent);
  color: var(--accent);
}

.btn-accent:hover {
  background: var(--accent);
  color: var(--bg);
}

/* 通用区块样式 */
.section-block {
  padding: 5rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
}

.section-title {
  font-size: 2.4rem;
  font-weight: 900;
  text-align: center;
  margin-bottom: 1rem;
}

.section-subtitle {
  text-align: center;
  color: var(--text-muted);
  font-size: 1.05rem;
  margin-bottom: 3rem;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

/* 编号清单 */
.steps-list {
  max-width: 800px;
  margin: 0 auto;
  counter-reset: step-counter;
}

.step-item {
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
  padding: 1.5rem 0;
  border-bottom: 1px dashed rgba(148, 163, 184, 0.3);
}

.step-item:last-child { border-bottom: none; }

.step-num {
  counter-increment: step-counter;
  flex-shrink: 0;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  border: 2px solid var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.2rem;
  color: var(--primary);
}

.step-num::before {
  content: counter(step-counter);
}

.step-content {
  flex: 1;
}

.step-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.3rem;
}

.step-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* 对比表格 */
.comparison-wrap {
  max-width: 960px;
  margin: 0 auto;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  overflow: hidden;
}

.comparison-table {
  width: 100%;
  background: var(--card-bg);
}

.comparison-table thead th {
  background: rgba(34, 211, 238, 0.08);
  color: var(--text);
  font-weight: 700;
  padding: 1.2rem 1.5rem;
  font-size: 1.1rem;
  border-bottom: 2px solid var(--border-color);
}

.comparison-table tbody td {
  padding: 1.2rem 1.5rem;
  border-bottom: 1px solid rgba(148, 163, 184, 0.2);
  font-size: 0.95rem;
  color: var(--text-muted);
  vertical-align: top;
}

.comparison-table tbody td:first-child {
  font-weight: 600;
  color: var(--text);
}

.comparison-table tbody tr:last-child td { border-bottom: none; }

.comparison-table .highlight {
  color: var(--primary);
  font-weight: 600;
}

/* 特色卡片 */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  max-width: 1100px;
  margin: 0 auto;
}

.feature-card {
  padding: 2rem 1.5rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: var(--card-bg);
  transition: transform 0.3s ease, border-color 0.3s;
}

.feature-card:hover {
  border-color: var(--primary);
  transform: translateY(-5px);
}

.feature-icon {
  font-size: 2rem;
  color: var(--accent);
  margin-bottom: 1rem;
}

.feature-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

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

/* FAQ */
.faq-wrap {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  margin-bottom: 1rem;
  border-bottom: 1px solid rgba(148, 163, 184, 0.2);
  padding-bottom: 1.2rem;
}

.faq-question {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text);
}

.faq-answer {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* CTA */
.cta-section {
  background: rgba(34, 211, 238, 0.05);
  border-bottom: 1px solid var(--border-color);
}

.cta-inner {
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
}

.cta-title {
  font-size: 2.2rem;
  font-weight: 900;
  margin-bottom: 1rem;
}

.cta-desc {
  color: var(--text-muted);
  margin-bottom: 2rem;
  font-size: 1.05rem;
}

/* 友情链接 */
.friend-links {
  padding: 3rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
}

.friend-links h4 {
  text-align: center;
  color: var(--text-muted);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1.2rem;
  letter-spacing: 0.1em;
}

.friend-links-content {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
  word-break: break-all;
}

/* 页脚 */
.site-footer {
  padding: 2.5rem 1.5rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.site-footer .footer-brand {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 1rem;
}

.site-footer a {
  color: var(--text-muted);
  text-decoration: none;
  margin: 0 0.8rem;
}

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

/* 渐显与滚动动效 */
.fade-in-section {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in-section.visible {
  opacity: 1;
  transform: translateY(0);
}

img.lazy {
  opacity: 0;
  transition: opacity 0.4s;
}

img.lazy.loaded {
  opacity: 1;
}

/* 响应式 */
@media (max-width: 768px) {
  .hero-title { font-size: 2.2rem; }
  .stat-number { font-size: 3rem; }
  .section-title { font-size: 1.8rem; }
  .navbar-custom .navbar-collapse {
    background: var(--bg);
    padding: 1rem;
    border-top: 1px solid var(--border-color);
    margin-top: 0.5rem;
  }
}

/* --- 子页面追加 --- */
/* 本页专属补充样式 */
        .about-hero { padding: 100px 0 60px; }
.about-hero .hero-title { font-size: 2.8rem; }
.about-section { padding: 70px 0; border-bottom: 1px solid rgba(34, 211, 238, 0.1); }
.about-section:last-child { border-bottom: none; }
.about-text { color: var(--text); line-height: 1.9; font-size: 1.05rem; }
.about-text p { margin-bottom: 1.5rem; }
.about-text strong { color: var(--primary); font-weight: 600; }
.about-highlight { color: var(--accent); font-weight: 600; }
.feature-list-about { list-style: none; padding: 0; margin: 1.5rem 0; }
.feature-list-about li { padding: 10px 0; border-bottom: 1px solid rgba(34, 211, 238, 0.08); display: flex; align-items: flex-start; gap: 12px; }
.feature-list-about li:last-child { border-bottom: none; }
.feature-list-about li i { color: var(--primary); font-size: 1.1rem; margin-top: 4px; width: 22px; flex-shrink: 0; }
.timeline { position: relative; padding-left: 30px; margin: 2rem 0; }
.timeline::before { content: ''; position: absolute; left: 8px; top: 0; bottom: 0; width: 2px; background: linear-gradient(to bottom, var(--primary), var(--accent)); opacity: 0.4; }
.timeline-item { position: relative; margin-bottom: 2rem; }
.timeline-item::before { content: ''; position: absolute; left: -26px; top: 6px; width: 12px; height: 12px; border-radius: 50%; background: var(--primary); border: 2px solid var(--bg); box-shadow: 0 0 0 2px var(--primary); }
.timeline-year { color: var(--accent); font-weight: 700; font-size: 1.1rem; margin-bottom: 6px; }
.timeline-desc { color: var(--text-muted); font-size: 0.95rem; }
.values-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 24px; margin: 2rem 0; }
.value-card { background: var(--card-bg); border: 1px solid var(--border-color); border-radius: 12px; padding: 28px 24px; transition: transform 0.3s ease, border-color 0.3s ease; }
.value-card:hover { transform: translateY(-4px); border-color: var(--primary); }
.value-icon { font-size: 2rem; color: var(--primary); margin-bottom: 16px; display: block; }
.value-title { color: var(--text); font-weight: 600; font-size: 1.15rem; margin-bottom: 10px; }
.value-desc { color: var(--text-muted); font-size: 0.95rem; line-height: 1.7; }
.stat-box { text-align: center; padding: 30px 20px; background: rgba(34, 211, 238, 0.05); border: 1px solid rgba(34, 211, 238, 0.15); border-radius: 12px; }
.stat-box .stat-number { font-size: 2.2rem; font-weight: 800; color: var(--primary); }
.stat-box .stat-label { color: var(--text-muted); font-size: 0.9rem; margin-top: 8px; }
.about-hero .hero-title { font-size: 2rem; }
.about-section { padding: 50px 0; }
.values-grid { grid-template-columns: 1fr; }

/* --- 子页面追加 --- */
/* 页面专属补充样式 */
        .guide-hero { padding: 120px 0 60px; background: radial-gradient(ellipse at 20% 50%, rgba(34,211,238,0.08), transparent 50%), radial-gradient(ellipse at 80% 20%, rgba(251,146,60,0.06), transparent 40%); }
.guide-section { padding: 60px 0; border-bottom: 1px solid var(--border-color); }
.guide-section:last-of-type { border-bottom: none; }
.guide-card { background: var(--card-bg); border: 1px solid var(--border-color); border-radius: 12px; padding: 28px; height: 100%; transition: transform .3s ease, box-shadow .3s ease; }
.guide-card:hover { transform: translateY(-4px); box-shadow: 0 8px 30px rgba(34,211,238,0.08); }
.guide-card-icon { font-size: 28px; color: var(--primary); margin-bottom: 14px; }
.guide-card h3 { font-size: 1.2rem; font-weight: 700; color: var(--text); margin-bottom: 10px; }
.guide-card p { color: var(--text-muted); font-size: .92rem; line-height: 1.7; margin-bottom: 0; }
.step-number { display: inline-flex; align-items: center; justify-content: center; width: 36px; height: 36px; border-radius: 50%; background: rgba(34,211,238,.12); color: var(--primary); font-weight: 700; font-size: .95rem; margin-right: 12px; border: 1px solid var(--border-color); }
.guide-list { list-style: none; padding: 0; margin: 0; }
.guide-list li { padding: 10px 0; border-bottom: 1px solid rgba(255,255,255,.04); display: flex; align-items: flex-start; gap: 12px; color: var(--text-muted); font-size: .95rem; line-height: 1.7; }
.guide-list li:last-child { border-bottom: none; }
.guide-list i { color: var(--accent); font-size: .85rem; margin-top: 5px; }
.tip-box { background: rgba(251,146,60,.06); border-left: 3px solid var(--accent); padding: 18px 22px; border-radius: 0 8px 8px 0; margin: 24px 0; }
.tip-box p { margin: 0; color: var(--text); font-size: .93rem; line-height: 1.7; }
.tip-box i { color: var(--accent); margin-right: 8px; }
.badge-custom { display: inline-block; padding: 4px 14px; border-radius: 20px; font-size: .78rem; font-weight: 600; background: rgba(34,211,238,.12); color: var(--primary); border: 1px solid var(--border-color); margin-bottom: 16px; }
.nav-link.active { color: var(--primary) !important; }
.accordion-item { background: var(--card-bg); border: 1px solid var(--border-color); border-radius: 10px !important; margin-bottom: 12px; overflow: hidden; }
.accordion-button { background: transparent; color: var(--text); font-weight: 600; box-shadow: none; padding: 18px 22px; }
.accordion-button:not(.collapsed) { background: rgba(34,211,238,.05); color: var(--primary); }
.accordion-button:focus { box-shadow: none; border-color: var(--border-color); }
.accordion-button::after { filter: invert(1) brightness(1.5); }
.accordion-body { background: transparent; color: var(--text-muted); line-height: 1.8; font-size: .92rem; padding: 0 22px 20px; }
.table-custom { width: 100%; color: var(--text-muted); font-size: .9rem; }
.table-custom th { color: var(--text); font-weight: 600; padding: 12px 16px; border-bottom: 1px solid var(--border-color); background: rgba(34,211,238,.04); }
.table-custom td { padding: 12px 16px; border-bottom: 1px solid rgba(255,255,255,.04); }
.table-custom tr:last-child td { border-bottom: none; }
.guide-hero { padding: 90px 0 40px; }
.guide-section { padding: 40px 0; }

/* --- 子页面追加 --- */
/* 确保所有 bootstrap 组件跟随本站深色主题 */
        .card, .card-body, .card-header, .card-footer {
            background: var(--card-bg);
            color: var(--text);
            border-color: var(--border-color);
        }
.list-group-item {
            background: transparent;
            color: var(--text);
            border-color: var(--border-color);
        }
.accordion-item, .accordion-button {
            background: var(--card-bg);
            color: var(--text);
            border-color: var(--border-color);
        }
.form-control, .form-select {
            background: rgba(0, 0, 0, 0.35);
            color: var(--text);
            border-color: var(--border-color);
        }
.form-control::placeholder {
            color: rgba(255, 255, 255, 0.45);
        }
/* 页面专用轻微调整 */
        .legal-section {
            padding: 3.5rem 0;
            border-bottom: 1px solid rgba(148, 163, 184, 0.15);
        }
.legal-section:last-of-type {
            border-bottom: none;
        }
.legal-title {
            color: var(--primary);
            font-weight: 700;
            font-size: 1.65rem;
            margin-bottom: 1.25rem;
            letter-spacing: -0.01em;
        }
.legal-title i {
            color: var(--accent);
            margin-right: 0.6rem;
        }
.legal-text, .legal-list li {
            color: var(--text-muted);
            line-height: 1.8;
            font-weight: 300;
        }
.legal-list {
            padding-left: 1.2rem;
            list-style-type: none;
        }
.legal-list li {
            position: relative;
            margin-bottom: 0.75rem;
            padding-left: 1.5rem;
        }
.legal-list li::before {
            content: "\f061"; /* fa-arrow-right */
            font-family: "Font Awesome 6 Free";
            font-weight: 900;
            color: var(--accent);
            position: absolute;
            left: 0;
            top: 0.1rem;
            font-size: 0.8rem;
            opacity: 0.8;
        }
.highlight-badge {
            background: rgba(251, 146, 60, 0.12);
            border: 1px solid rgba(251, 146, 60, 0.3);
            color: var(--accent);
            border-radius: 50px;
            padding: 0.15rem 0.9rem;
            font-size: 0.85rem;
            font-weight: 600;
            display: inline-block;
            margin-bottom: 1.2rem;
        }
/* 保证导航品牌连续 */
        .navbar-brand {
            font-weight: 800;
            letter-spacing: -0.02em;
        }
.navbar-brand i {
            margin-right: 0.3rem;
        }

/* --- 子页面追加 --- */
.privacy-section {
            padding: 80px 0;
        }
.privacy-title {
            font-size: 2.5rem;
            font-weight: 800;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            margin-bottom: 20px;
        }
.privacy-meta {
            color: var(--text-muted);
            font-size: 0.9rem;
            margin-bottom: 40px;
            padding-bottom: 20px;
            border-bottom: 1px solid var(--border-color);
        }
.privacy-block {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 30px;
            margin-bottom: 30px;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
.privacy-block:hover {
            transform: translateY(-4px);
            box-shadow: 0 8px 32px rgba(34, 211, 238, 0.1);
        }
.privacy-block h2 {
            color: var(--primary);
            font-size: 1.4rem;
            font-weight: 700;
            margin-bottom: 15px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
.privacy-block h2 i {
            color: var(--accent);
            font-size: 1.2rem;
        }
.privacy-block p {
            color: var(--text-muted);
            line-height: 1.8;
            margin-bottom: 12px;
        }
.privacy-block ul {
            color: var(--text-muted);
            padding-left: 20px;
            margin-bottom: 12px;
        }
.privacy-block ul li {
            margin-bottom: 8px;
            line-height: 1.6;
        }
.privacy-block strong {
            color: var(--text);
        }
.highlight-box {
            background: rgba(34, 211, 238, 0.08);
            border-left: 4px solid var(--primary);
            padding: 15px 20px;
            border-radius: 0 8px 8px 0;
            margin: 20px 0;
        }
.highlight-box p {
            color: var(--text);
            margin-bottom: 0;
        }
.last-updated {
            display: inline-block;
            background: rgba(251, 146, 60, 0.1);
            color: var(--accent);
            padding: 5px 15px;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 600;
            margin-bottom: 30px;
        }
.privacy-title {
                font-size: 2rem;
            }
.privacy-block {
                padding: 20px;
            }

/* --- Bootstrap 组件配色适配(程序自动补,避免白底黑字) --- */
.accordion-header { background:transparent !important; }