:root {
      --main-color: #38bdf8;
      --accent-color: #a78bfa;
      --bg-color: #0f172a;
      --text-color: #e2e8f0;
      --card-bg: #1e293b;
      --border-color: #334155;
      --radius: 8px;
      --shadow: 0 8px 20px rgba(0,0,0,0.3);
    }

    body {
      background-color: var(--bg-color);
      color: var(--text-color);
      font-family: 'Noto Sans SC', 'Inter', sans-serif;
      font-weight: 300;
      line-height: 1.7;
      overflow-x: hidden;
    }
    h1, h2, h3, .display-font {
      font-family: 'Noto Serif SC', serif;
      font-weight: 700;
    }
    a { color: var(--main-color); text-decoration: none; }
    a:hover { color: var(--accent-color); }

    /* 波浪分割 */
    .wave-divider {
      position: relative;
      height: 60px;
      background: transparent;
    }
    .wave-divider::before {
      content: "";
      position: absolute;
      left: 0; right: 0; top: 0;
      height: 60px;
      background: radial-gradient(circle at 50% 0%, var(--bg-color) 25%, transparent 25%) 0 0/40px 30px repeat-x;
    }

    /* 导航 */
    .navbar-custom {
      background: rgba(15, 23, 42, 0.85);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border-color);
    }
    .navbar-brand {
      font-family: 'Noto Serif SC', serif;
      font-weight: 900;
      font-size: 1.6rem;
      color: var(--text-color) !important;
      letter-spacing: 0.05em;
    }
    .navbar-brand i {
      color: var(--accent-color);
      margin-right: 5px;
    }
    .navbar-nav .nav-link {
      color: var(--text-color) !important;
      font-weight: 400;
      margin: 0 12px;
      transition: 0.2s;
      border-radius: 20px;
      padding: 5px 12px;
    }
    .navbar-nav .nav-link:hover {
      color: var(--main-color) !important;
      background: rgba(56, 189, 248, 0.1);
    }

    /* Hero 主视觉 */
    .hero-section {
      position: relative;
      min-height: 70vh;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      background: linear-gradient(rgba(15,23,42,0.8), rgba(15,23,42,0.9)), url('{随机图片}') center/cover no-repeat;
      border-bottom: 3px solid var(--main-color);
    }
    .hero-content h1 {
      font-size: clamp(3rem, 8vw, 4.5rem);
      font-weight: 900;
      text-shadow: 0 8px 20px rgba(0,0,0,0.8);
      color: white;
    }
    .hero-content p {
      font-size: 1.2rem;
      max-width: 600px;
      margin: 1rem auto;
      color: #cbd5e1;
    }
    .hero-btn {
      background: var(--main-color);
      border: none;
      padding: 12px 28px;
      border-radius: 30px;
      font-weight: 600;
      color: #0f172a;
      box-shadow: 0 0 20px rgba(56,189,248,0.4);
      transition: 0.3s;
      position: relative;
      overflow: hidden;
    }
    .hero-btn::after {
      content: "";
      position: absolute;
      top: 0; left: -80%;
      width: 40%; height: 100%;
      background: linear-gradient(100deg, transparent, rgba(255,255,255,0.5), transparent);
      transform: skewX(-20deg);
      transition: 0.6s;
    }
    .hero-btn:hover::after {
      left: 120%;
    }
    .hero-btn:hover {
      background: var(--accent-color);
      color: white;
      box-shadow: 0 0 30px rgba(167,139,250,0.5);
    }

    /* Bento 网格 */
    .bento-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin: 40px 0;
    }
    .bento-card {
      background: var(--card-bg);
      border-radius: var(--radius);
      padding: 1.8rem;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow);
      transition: transform 0.2s;
    }
    .bento-card:hover {
      transform: translateY(-5px);
    }
    .col-span-2 { grid-column: span 2; }
    .col-span-4 { grid-column: span 4; }
    .row-span-2 { grid-row: span 2; }

    /* 卡片通用 */
    .card-flat {
      background: var(--card-bg);
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      padding: 2rem;
      box-shadow: 0 4px 10px rgba(0,0,0,0.2);
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      border-left: 6px solid var(--main-color);
      padding-left: 15px;
      margin: 2.5rem 0 2rem;
    }
    .list-number {
      list-style: none;
      counter-reset: my-counter;
      padding-left: 0;
    }
    .list-number li {
      counter-increment: my-counter;
      margin-bottom: 1.2rem;
      padding-left: 2.5rem;
      position: relative;
    }
    .list-number li::before {
      content: counter(my-counter);
      position: absolute;
      left: 0;
      top: 0;
      width: 1.8rem;
      height: 1.8rem;
      background: var(--accent-color);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      font-size: 0.9rem;
    }

    /* 表格样式 */
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      background: var(--card-bg);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow);
    }
    .compare-table th, .compare-table td {
      padding: 14px 16px;
      border-bottom: 1px solid var(--border-color);
    }
    .compare-table th {
      background: #1e293b;
      color: var(--main-color);
      font-weight: 600;
    }
    .compare-table td i.fa-check { color: var(--main-color); }
    .compare-table td i.fa-xmark { color: #f87171; }

    /* FAQ */
    .faq-item {
      background: var(--card-bg);
      border-radius: var(--radius);
      padding: 1.2rem 1.5rem;
      margin-bottom: 1rem;
      border-left: 4px solid var(--main-color);
    }
    .faq-question {
      font-weight: 600;
      font-size: 1.1rem;
    }
    .faq-answer {
      color: #b0c4de;
      margin-top: 0.5rem;
    }

    /* CTA */
    .cta-box {
      background: linear-gradient(145deg, #1e293b, #0f172a);
      border: 1px solid var(--main-color);
      border-radius: 12px;
      padding: 3rem 2rem;
      text-align: center;
    }
    .cta-box h2 {
      font-size: 2.8rem;
    }

    /* footer 友情链接 */
    .footer-link-section {
      border-top: 1px solid var(--border-color);
      padding: 30px 0;
    }
    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 20px;
      justify-content: center;
    }

    /* 数字动画占位 */
    .stat-number {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--accent-color);
    }

    /* 图片懒加载渐显 */
    .lazy-img {
      background: #1e293b;
      opacity: 0;
      transition: opacity 0.4s ease;
      width: 100%;
      border-radius: var(--radius);
    }
    .lazy-img.loaded {
      opacity: 1;
    }

    @media (max-width: 992px) {
      .bento-grid {
        grid-template-columns: 1fr 1fr;
      }
      .col-span-2 { grid-column: span 2; }
    }
    @media (max-width: 600px) {
      .bento-grid { grid-template-columns: 1fr; }
      .col-span-2 { grid-column: span 1; }
      .hero-content h1 { font-size: 2.5rem; }
    }

    /* 卡片数字动效 */
    .num-highlight {
      font-weight: 900;
      color: var(--main-color);
    }

/* --- 子页面追加 --- */
/* 保证品牌名连续不被图标打断 */
    .navbar-brand i {
      margin-right: 6px;
    }
/* 页面内小标题品牌色点缀 */
    .about-section h2 i {
      color: var(--main-color);
      margin-right: 10px;
    }
/* 关于页特色卡片的图标颜色 */
    .bento-card i {
      color: var(--accent-color);
    }
/* 确保任何bootstrap组件都不覆盖我们的配色 (本页少用bootstrap组件, 但保险起见) */
    .card, .card-body, .card-title, .card-text {
      background: var(--card-bg) !important;
      color: var(--text-color) !important;
      border-color: var(--border-color) !important;
    }
.form-control, .form-select {
      background: rgba(0,0,0,.35) !important;
      color: var(--text-color) !important;
      border-color: var(--border-color) !important;
    }
.form-control::placeholder {
      color: rgba(255,255,255,.45) !important;
    }
/* 覆盖Bootstrap导航可能带来的白色背景 */
    .navbar, .navbar-nav .nav-link {
      background: transparent !important;
      color: var(--text-color) !important;
    }
.navbar-nav .nav-link.active {
      color: var(--main-color) !important;
    }
/* 页脚友情链接样式与首页一致 */
    .friend-links a {
      color: var(--text-color);
      text-decoration: none;
      margin-right: 15px;
    }
.friend-links a:hover {
      color: var(--main-color);
    }