/* roulang page: index */
:root {
      --deep-green: #0B1A1A;
      --electric-orange: #FF6B2B;
      --warm-white: #F5F3EE;
      --slate-gray: #2C2C2C;
      --neon-cyan: #00E5A0;
      --soft-shadow: 0 2px 12px rgba(0,0,0,0.04);
      --hover-shadow: 0 8px 24px rgba(0,0,0,0.08);
      --border-radius-card: 16px;
      --border-radius-btn: 8px;
      --font-title: -0.02em;
      --transition-smooth: all 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      background-color: var(--deep-green);
      color: var(--slate-gray);
      line-height: 1.5;
      margin: 0;
      overflow-x: hidden;
    }
    h1, h2, h3, h4, .hero-title, .section-title {
      font-weight: 700;
      letter-spacing: var(--font-title);
    }
    .mono-number {
      font-family: "SF Mono", "Menlo", "Consolas", monospace;
      font-weight: 600;
    }
    /* 导航 */
    .navbar-custom {
      background: rgba(11, 26, 26, 0.85);
      backdrop-filter: blur(12px);
      padding: 0.5rem 0;
      min-height: 72px;
      transition: var(--transition-smooth);
      border-bottom: 1px solid rgba(245,243,238,0.08);
    }
    .navbar-custom.scrolled {
      background: rgba(11, 26, 26, 0.95);
      box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    }
    .navbar-brand {
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--warm-white) !important;
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
    }
    .navbar-brand i {
      color: var(--electric-orange);
      margin-right: 8px;
    }
    .nav-link {
      color: rgba(245,243,238,0.8) !important;
      font-weight: 500;
      margin: 0 0.5rem;
      transition: var(--transition-smooth);
      position: relative;
      padding: 0.5rem 0.8rem !important;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--electric-orange) !important;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0.8rem;
      width: 0;
      height: 2px;
      background: var(--electric-orange);
      transition: width 0.2s ease;
    }
    .nav-link:hover::after, .nav-link.active::after {
      width: calc(100% - 1.6rem);
    }
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: var(--deep-green);
      border-top: 1px solid rgba(245,243,238,0.15);
      z-index: 1030;
      padding: 0.4rem 0;
      justify-content: space-around;
    }
    .mobile-nav-item {
      color: var(--warm-white);
      font-size: 0.7rem;
      text-align: center;
      opacity: 0.7;
      transition: var(--transition-smooth);
    }
    .mobile-nav-item i {
      font-size: 1.2rem;
      display: block;
      margin-bottom: 2px;
    }
    .mobile-nav-item.active {
      color: var(--electric-orange);
      opacity: 1;
    }
    /* 按钮 */
    .btn-primary-custom {
      background: var(--electric-orange);
      border: none;
      color: white;
      border-radius: var(--border-radius-btn);
      padding: 0.8rem 2rem;
      font-weight: 600;
      transition: var(--transition-smooth);
      box-shadow: 0 4px 10px rgba(255,107,43,0.3);
    }
    .btn-primary-custom:hover {
      background: #E55A1F;
      transform: translateY(-2px);
      box-shadow: 0 10px 20px rgba(255,107,43,0.4);
      color: white;
    }
    .btn-outline-custom {
      background: transparent;
      border: 1.5px solid var(--electric-orange);
      color: var(--electric-orange);
      border-radius: var(--border-radius-btn);
      padding: 0.8rem 2rem;
      font-weight: 600;
      transition: var(--transition-smooth);
    }
    .btn-outline-custom:hover {
      background: var(--electric-orange);
      color: white;
      border-color: var(--electric-orange);
    }
    /* 区块 */
    section {
      padding: 6rem 0;
    }
    .bg-warm {
      background-color: var(--warm-white);
    }
    .bg-deep {
      background-color: var(--deep-green);
    }
    .section-title {
      font-size: 2.2rem;
      color: var(--warm-white);
    }
    .bg-warm .section-title {
      color: var(--deep-green);
    }
    .title-decor {
      width: 4px;
      height: 2rem;
      background: var(--electric-orange);
      display: inline-block;
      margin-right: 1rem;
      vertical-align: middle;
    }
    /* 卡片 */
    .card-custom {
      background: rgba(44,44,44,0.7);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(245,243,238,0.1);
      border-radius: var(--border-radius-card);
      padding: 1.8rem;
      transition: var(--transition-smooth);
      color: var(--warm-white);
      height: 100%;
    }
    .card-custom:hover {
      transform: translateY(-4px);
      box-shadow: var(--hover-shadow);
      border-color: var(--electric-orange);
    }
    .bg-warm .card-custom {
      background: var(--warm-white);
      color: var(--slate-gray);
      border: 1px solid rgba(0,0,0,0.05);
    }
    .score-number {
      font-size: 2.8rem;
      color: var(--neon-cyan);
      text-shadow: 0 0 8px rgba(0,229,160,0.6);
      transition: color 0.2s, transform 0.2s;
    }
    /* 杂志流 */
    .magazine-img {
      background-size: cover;
      background-position: center;
      min-height: 280px;
      border-radius: var(--border-radius-card);
      transition: transform 0.3s ease;
    }
    .magazine-img:hover {
      transform: scale(1.02);
    }
    /* 方案对比 */
    .plan-card {
      background: var(--warm-white);
      border-radius: var(--border-radius-card);
      padding: 2rem;
      border: 1px solid rgba(0,0,0,0.05);
      transition: var(--transition-smooth);
      position: relative;
    }
    .plan-card.featured {
      border-top: 3px solid var(--electric-orange);
      box-shadow: 0 12px 28px rgba(0,0,0,0.08);
      transform: translateY(-8px);
    }
    /* FAQ */
    .accordion-button {
      background: var(--warm-white);
      color: var(--slate-gray);
      font-weight: 600;
      border-left: 4px solid var(--neon-cyan);
      box-shadow: none;
      border-radius: 8px !important;
      margin-bottom: 0.5rem;
      transition: var(--transition-smooth);
    }
    .accordion-button:not(.collapsed) {
      background: #f0ede6;
      color: var(--deep-green);
      box-shadow: none;
    }
    /* 页脚 */
    footer a {
      color: rgba(245,243,238,0.7);
      text-decoration: none;
      transition: color 0.2s;
    }
    footer a:hover {
      color: var(--electric-orange);
    }
    @media (max-width: 768px) {
      .navbar-custom {
        display: none;
      }
      .mobile-bottom-nav {
        display: flex;
      }
      section {
        padding: 4rem 0;
      }
      .hero-title {
        font-size: 2.5rem !important;
      }
      .plan-card.featured {
        transform: none;
      }
    }
    @media (min-width: 769px) {
      .mobile-bottom-nav {
        display: none;
      }
    }