:root {
  --main: #38bdf8;
  --accent: #a78bfa;
  --bg: #0f172a;
  --text: #e2e8f0;
  --border-glow: rgba(56, 189, 248, 0.35);
  --card-bg: #1e293b;
}
* { margin:0; padding:0; box-sizing: border-box; }
body {
  background-color: var(--bg);
  color: var(--text);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  font-weight: 300;
  line-height: 1.7;
  letter-spacing: 0.2px;
  overflow-x: hidden;
}
h1,h2,h3,h4,.brand-font {
  font-family: 'Inter', 'Segoe UI', sans-serif;
  font-weight: 900;
  letter-spacing: -0.02em;
}
/* 手写体标题点缀 */
.display-hand {
  font-family: 'Comic Neue', 'Kalam', 'Segoe Print', 'Bradley Hand', cursive;
  font-weight: 700;
  letter-spacing: 1px;
}
/* 几何色块背景 */
.geo-bg::before {
  content: '';
  position: fixed;
  top: -5%; left: -10%;
  width: 300px; height: 300px;
  background: var(--main);
  opacity: 0.04;
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
}
.geo-bg::after {
  content: '';
  position: fixed;
  bottom: 0; right: -5%;
  width: 250px; height: 250px;
  background: var(--accent);
  opacity: 0.04;
  clip-path: polygon(50% 0%, 100% 100%, 0% 100%);
  pointer-events: none;
  z-index: 0;
}
.navbar {
  transition: background 0.2s ease, backdrop-filter 0.2s ease;
  background: transparent;
  border-bottom: 1px solid transparent;
}
.navbar.scrolled {
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(9px);
  border-bottom: 1px solid var(--border-glow);
}
.navbar-brand {
  font-weight: 800;
  font-size: 1.7rem;
  color: var(--main) !important;
  letter-spacing: -0.03em;
}
.nav-link {
  color: var(--text) !important;
  font-weight: 500;
  margin: 0 0.8rem;
  opacity: 0.8;
  transition: 0.2s;
}
.nav-link:hover { opacity: 1; color: var(--main) !important; }
/* HERO 打字机 + 视差 */
.hero-section {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: var(--bg);
  /* 视差背景 */
  background-image: url('{随机图片}');
  background-size: cover;
  background-position: center 30%;
  background-attachment: fixed;
  border-bottom: 1px solid var(--border-glow);
}
.hero-cover {
  background: rgba(15, 23, 42, 0.55);
  padding: 3rem 2rem;
  text-align: center;
  width: 100%;
  backdrop-filter: blur(2px);
}
.typewriter-title {
  font-size: clamp(3rem, 10vw, 7rem);
  font-weight: 900;
  color: var(--text);
  text-shadow: 0 0 20px rgba(56, 189, 248, 0.3);
  border-right: 4px solid var(--main);
  display: inline-block;
  white-space: nowrap;
  overflow: hidden;
  animation: caret 0.8s step-end infinite;
}
@keyframes caret { 50% { border-color: transparent; } }
.hero-sub {
  font-size: 1.3rem;
  color: var(--text);
  opacity: 0.85;
  font-weight: 300;
  letter-spacing: 2px;
  margin-top: 1rem;
}
/* 分区通用 */
.section-block {
  padding: 5rem 0;
  border-bottom: 1px solid rgba(226, 232, 240, 0.08);
}
.container-custom {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
}
/* 标题大字 */
.heading-lg {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 2rem;
  color: var(--text);
  border-left: 8px solid var(--main);
  padding-left: 1.5rem;
}
.heading-md {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--main);
  margin-bottom: 1.5rem;
}
/* 长文排版 */
.long-read p {
  font-size: 1.1rem;
  line-height: 2;
  margin-bottom: 1.8rem;
  color: #cbd5e1;
}
.highlight-number {
  font-size: 4.5rem;
  font-weight: 900;
  color: var(--accent);
  line-height: 1;
  display: block;
  margin: 0.8rem 0;
}
/* 对比表格 */
.compare-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--card-bg);
}
.compare-table th, .compare-table td {
  border: 1px solid #334155;
  padding: 1.2rem 1.5rem;
  text-align: center;
}
.compare-table th {
  background: #0f172a;
  color: var(--main);
  font-weight: 600;
}
.compare-table td {
  color: var(--text);
}
/* 步骤条 */
.steps-rail {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  justify-content: space-between;
  position: relative;
}
.step-item {
  flex: 1 1 200px;
  border-top: 2px solid var(--accent);
  padding-top: 1.5rem;
  position: relative;
}
.step-item::before {
  content: attr(data-step);
  position: absolute;
  top: -1.2rem;
  left: 0;
  background: var(--bg);
  padding-right: 1rem;
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
}
/* 卡片网格 */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 2rem;
}
.feature-card {
  background: transparent;
  border: 1px solid var(--border-glow);
  border-radius: 0;
  overflow: hidden;
  transition: border-color 0.2s;
  position: relative;
}
.feature-card img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  transition: transform 0.4s ease;
  display: block;
  background: url('{随机图片}') center/cover;
}
.feature-card:hover img {
  transform: scale(1.1);
}
.card-body {
  padding: 1.5rem;
  background: var(--bg);
}
.feature-card .card-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(0deg, rgba(15,23,42,0.95), transparent);
  padding: 2rem 1rem 1rem;
  opacity: 0;
  transition: opacity 0.3s;
  color: white;
}
.feature-card:hover .card-overlay {
  opacity: 1;
}
/* FAQ */
.faq-item {
  border-bottom: 1px solid #1e293b;
  padding: 1.5rem 0;
}
.faq-question {
  font-weight: 600;
  font-size: 1.25rem;
  color: var(--main);
}
/* CTA */
.cta-section {
  background: linear-gradient(145deg, #0f172a, #1e293b);
  border-top: 1px solid var(--border-glow);
  text-align: center;
}
.btn-accent {
  border: 2px solid var(--accent);
  color: var(--accent);
  background: transparent;
  padding: 0.8rem 3rem;
  font-weight: 600;
  transition: 0.2s;
}
.btn-accent:hover {
  background: var(--accent);
  color: #0f172a;
}
footer {
  border-top: 1px solid #1e293b;
  padding: 2rem 0;
  color: #94a3b8;
}
.footer-link a {
  color: var(--text);
  opacity: 0.8;
  text-decoration: none;
  margin: 0 0.8rem;
}

/* --- 子页面追加 --- */
/* 本页专属微调样式 */
        .about-hero {
            background: linear-gradient(135deg, rgba(56, 189, 248, 0.12) 0%, rgba(167, 139, 250, 0.08) 50%, rgba(15, 23, 42, 0.6) 100%);
            border-bottom: 1px solid var(--border-glow);
            padding: 5rem 0 3.5rem;
        }
.about-stats {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1.5rem;
            margin: 2.5rem 0;
        }
.stat-item {
            background: var(--card-bg);
            border: 1px solid var(--border-glow);
            border-radius: 1rem;
            padding: 1.5rem 1rem;
            text-align: center;
            transition: transform .3s ease, box-shadow .3s ease;
        }
.stat-item:hover {
            transform: translateY(-6px);
            box-shadow: 0 12px 30px rgba(56, 189, 248, 0.12);
        }
.stat-num {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--main);
            display: block;
            line-height: 1.2;
        }
.stat-label {
            font-size: .9rem;
            color: var(--text);
            opacity: .75;
            margin-top: .35rem;
        }
.about-section {
            padding: 3.5rem 0;
        }
.about-grid {
            display: grid;
            grid-template-columns: 1.1fr 1fr;
            gap: 3rem;
            align-items: center;
        }
.about-text p {
            color: var(--text);
            line-height: 1.85;
            margin-bottom: 1.1rem;
            opacity: .92;
        }
.about-text strong {
            color: var(--main);
        }
.timeline-list {
            list-style: none;
            padding: 0;
            margin: 0;
        }
.timeline-list li {
            padding: .8rem 0 .8rem 2.2rem;
            position: relative;
            border-bottom: 1px dashed rgba(56, 189, 248, 0.18);
            color: var(--text);
            line-height: 1.7;
        }
.timeline-list li::before {
            content: '◆';
            position: absolute;
            left: 0;
            top: .9rem;
            color: var(--main);
            font-size: .85rem;
        }
.timeline-list li:last-child {
            border-bottom: none;
        }
.feature-badge {
            display: inline-block;
            background: rgba(56, 189, 248, 0.12);
            border: 1px solid var(--border-glow);
            color: var(--main);
            font-size: .8rem;
            font-weight: 600;
            padding: .2rem 1rem;
            border-radius: 2rem;
            margin-bottom: 1.2rem;
        }
.about-cta {
            background: var(--card-bg);
            border: 1px solid var(--border-glow);
            border-radius: 1.2rem;
            padding: 2.5rem 2rem;
            text-align: center;
            margin-top: 2.5rem;
        }
.about-stats {
                grid-template-columns: repeat(3, 1fr);
                gap: .8rem;
            }
.stat-num {
                font-size: 1.6rem;
            }
.about-grid {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
.about-hero {
                padding: 3rem 0 2rem;
            }

/* --- 子页面追加 --- */
/* 页面专属补充样式 */
    .privacy-section {
      padding: 4rem 0;
    }
.privacy-card {
      background: var(--card-bg);
      border: 1px solid var(--border-glow);
      border-radius: 16px;
      padding: 2rem;
      margin-bottom: 1.5rem;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
    }
.privacy-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 8px 24px rgba(56, 189, 248, 0.15);
    }
.privacy-card h3 {
      color: var(--main);
      font-weight: 700;
      font-size: 1.4rem;
      margin-bottom: 1rem;
      display: flex;
      align-items: center;
      gap: 0.75rem;
    }
.privacy-card h3 i {
      color: var(--accent);
      font-size: 1.2rem;
    }
.privacy-card p, .privacy-card li {
      color: var(--text);
      opacity: 0.9;
      line-height: 1.8;
      font-size: 0.95rem;
    }
.privacy-card ul {
      padding-left: 1.5rem;
      margin-top: 0.5rem;
    }
.privacy-card li {
      margin-bottom: 0.5rem;
    }
.last-updated {
      color: var(--text);
      opacity: 0.7;
      font-size: 0.9rem;
      border-left: 3px solid var(--accent);
      padding-left: 1rem;
      margin-bottom: 2rem;
    }
.contact-link {
      color: var(--main);
      text-decoration: none;
      font-weight: 600;
      transition: color 0.3s ease;
    }
.contact-link:hover {
      color: var(--accent);
    }
.highlight-box {
      background: rgba(167, 139, 250, 0.1);
      border: 1px solid rgba(167, 139, 250, 0.3);
      border-radius: 12px;
      padding: 1.5rem;
      margin-top: 2rem;
    }