/* roulang page: index */
:root {
      --deep-space: #0B0C10;
      --starlight-indigo: #1F2833;
      --aurora-cyan: #45A29E;
      --text-primary: #F0F0F0;
      --text-secondary: #C5C6C7;
      --stardust-gold: #F2A900;
      --card-bg: rgba(31, 40, 51, 0.6);
      --card-border: rgba(69, 162, 158, 0.25);
      --glass-blur: blur(12px);
      --shadow-deep: 0 8px 32px rgba(0,0,0,0.4);
      --border-radius-lg: 16px;
      --border-radius-md: 12px;
      --border-radius-btn: 8px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-mono: "Inter", "SF Pro Display", sans-serif;
      --section-padding: 100px;
      --card-padding: 24px;
      --card-gap: 24px;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: var(--font-sans);
      background-color: var(--deep-space);
      color: var(--text-primary);
      line-height: 1.7;
      overflow-x: hidden;
    }
    h1, h2, h3, h4, h5, h6 {
      font-weight: 700;
      line-height: 1.3;
    }
    a {
      text-decoration: none;
      transition: all 0.25s ease;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    /* 背景星空噪点纹理 */
    body::before {
      content: "";
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: radial-gradient(rgba(255,255,255,0.06) 1px, transparent 1px);
      background-size: 4px 4px;
      pointer-events: none;
      z-index: 0;
    }
    .container-custom {
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    section {
      padding-top: var(--section-padding);
      padding-bottom: var(--section-padding);
      position: relative;
      z-index: 1;
    }
    /* 导航栏 */
    .navbar-custom {
      position: sticky;
      top: 0;
      z-index: 1030;
      background: rgba(11, 12, 16, 0.85);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(69, 162, 158, 0.3);
      padding: 0.5rem 0;
    }
    .navbar-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
    }
    .nav-left, .nav-right {
      display: flex;
      align-items: center;
      gap: 1.8rem;
    }
    .nav-link-custom {
      color: var(--text-secondary);
      font-weight: 500;
      font-size: 0.95rem;
      letter-spacing: 0.3px;
      position: relative;
      padding: 0.25rem 0;
    }
    .nav-link-custom:hover {
      color: var(--aurora-cyan);
    }
    .nav-link-custom.active {
      color: var(--aurora-cyan);
    }
    .nav-link-custom.active::after {
      content: "";
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--aurora-cyan);
    }
    .logo-text {
      font-size: 1.8rem;
      font-weight: 700;
      background: linear-gradient(135deg, var(--aurora-cyan) 0%, var(--stardust-gold) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      white-space: nowrap;
    }
    .navbar-toggler {
      border: 1px solid var(--aurora-cyan);
      color: var(--aurora-cyan);
      padding: 0.25rem 0.6rem;
      background: transparent;
    }
    .navbar-toggler-icon {
      background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(69, 162, 158, 1)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    }
    @media (max-width: 992px) {
      .nav-left, .nav-right {
        flex-direction: column;
        width: 100%;
        gap: 0.8rem;
        padding: 1rem 0;
        align-items: flex-start;
      }
      .navbar-container {
        flex-wrap: wrap;
      }
      .logo-wrap {
        order: -1;
        width: auto;
      }
      .navbar-collapse {
        width: 100%;
      }
    }
    /* Hero区域 */
    .hero-section {
      padding-top: 60px;
      padding-bottom: 60px;
      position: relative;
      background: radial-gradient(circle at 30% 40%, rgba(69,162,158,0.08) 0%, transparent 50%);
    }
    .hero-glow {
      position: absolute;
      width: 200px;
      height: 200px;
      background: rgba(69,162,158,0.2);
      filter: blur(80px);
      border-radius: 50%;
      top: 20%;
      right: 15%;
      z-index: 0;
    }
    .hero-title {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1.5rem;
    }
    .gradient-text {
      background: linear-gradient(135deg, var(--aurora-cyan) 0%, var(--stardust-gold) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .hero-subtitle {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 2rem;
      max-width: 500px;
    }
    .btn-primary-custom {
      background: var(--aurora-cyan);
      color: #0B0C10;
      font-weight: 600;
      padding: 0.7rem 2rem;
      border-radius: var(--border-radius-btn);
      border: none;
      transition: all 0.25s ease;
      box-shadow: 0 4px 12px rgba(69,162,158,0.3);
    }
    .btn-primary-custom:hover {
      background: #3b8b86;
      box-shadow: 0 0 18px rgba(69,162,158,0.7);
      transform: translateY(-2px);
      color: #0B0C10;
    }
    .btn-outline-custom {
      background: transparent;
      border: 2px solid var(--aurora-cyan);
      color: var(--aurora-cyan);
      font-weight: 600;
      padding: 0.7rem 2rem;
      border-radius: var(--border-radius-btn);
      transition: all 0.25s ease;
    }
    .btn-outline-custom:hover {
      background: rgba(69,162,158,0.15);
      box-shadow: 0 0 18px rgba(69,162,158,0.5);
      transform: translateY(-2px);
      color: var(--aurora-cyan);
    }
    .hero-image-placeholder {
      background: rgba(31,40,51,0.5);
      backdrop-filter: blur(8px);
      border-radius: var(--border-radius-lg);
      border: 1px solid var(--card-border);
      overflow: hidden;
      box-shadow: 0 0 25px rgba(69,162,158,0.25);
      aspect-ratio: 16/10;
    }
    /* 亮点卡片 */
    .highlight-card {
      background: var(--card-bg);
      backdrop-filter: var(--glass-blur);
      border: 1px solid var(--card-border);
      border-radius: var(--border-radius-md);
      padding: var(--card-padding);
      transition: all 0.3s ease;
      height: 100%;
    }
    .highlight-card:hover {
      transform: translateY(-8px);
      border-color: var(--aurora-cyan);
      box-shadow: 0 16px 40px rgba(0,0,0,0.6);
    }
    .icon-circle {
      width: 60px;
      height: 60px;
      background: rgba(69,162,158,0.15);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 2rem;
      color: var(--aurora-cyan);
      margin-bottom: 1.2rem;
    }
    /* 案例瀑布 */
    .case-grid {
      column-count: 2;
      column-gap: 24px;
    }
    .case-card {
      break-inside: avoid;
      margin-bottom: 24px;
      background: var(--card-bg);
      backdrop-filter: var(--glass-blur);
      border: 1px solid var(--card-border);
      border-radius: var(--border-radius-lg);
      overflow: hidden;
      transition: all 0.3s ease;
    }
    .case-card:hover {
      transform: translateY(-6px);
      border-color: var(--aurora-cyan);
    }
    .case-img {
      width: 100%;
      aspect-ratio: 16/9;
      object-fit: cover;
    }
    .case-content {
      padding: 20px;
    }
    .data-highlight {
      font-family: var(--font-mono);
      color: var(--stardust-gold);
      font-weight: 700;
      font-size: 1.5rem;
    }
    @media (max-width: 768px) {
      .case-grid {
        column-count: 1;
      }
    }
    /* 方案对比 */
    .plan-card {
      background: rgba(31,40,51,0.7);
      backdrop-filter: blur(10px);
      border: 1px solid var(--card-border);
      border-radius: var(--border-radius-lg);
      padding: 2rem;
      transition: all 0.3s;
      position: relative;
    }
    .plan-card.recommended {
      border-color: var(--aurora-cyan);
      box-shadow: 0 0 25px rgba(69,162,158,0.4);
      transform: scale(1.02);
    }
    .badge-gold {
      background: var(--stardust-gold);
      color: #0B0C10;
      font-weight: 700;
      padding: 0.2rem 1rem;
      border-radius: 20px;
      font-size: 0.8rem;
    }
    /* FAQ手风琴 */
    .accordion-custom .accordion-item {
      background: transparent;
      border: none;
      margin-bottom: 12px;
    }
    .accordion-custom .accordion-button {
      background: rgba(31,40,51,0.7);
      backdrop-filter: blur(8px);
      color: var(--text-primary);
      font-weight: 600;
      border-left: 4px solid var(--aurora-cyan);
      border-radius: 0 !important;
      box-shadow: none;
      padding: 1rem 1.5rem;
    }
    .accordion-custom .accordion-button:not(.collapsed) {
      background: rgba(69,162,158,0.2);
      color: white;
      box-shadow: 0 0 15px rgba(69,162,158,0.4);
    }
    .accordion-custom .accordion-body {
      background: rgba(11,12,16,0.7);
      color: var(--text-secondary);
      padding: 1.2rem 1.5rem;
    }
    /* CTA横幅 */
    .cta-banner {
      background: #1a1f2b;
      padding: 60px 0;
    }
    /* 页脚 */
    .footer-links a {
      color: var(--text-secondary);
      display: block;
      margin-bottom: 6px;
      transition: 0.2s;
    }
    .footer-links a:hover {
      color: var(--aurora-cyan);
    }
    .social-icons i {
      font-size: 1.8rem;
      margin-right: 15px;
      color: var(--text-secondary);
      transition: 0.2s;
    }
    .social-icons i:hover {
      color: var(--aurora-cyan);
    }
    @media (max-width: 768px) {
      .hero-title {
        font-size: 2.2rem;
      }
      section {
        padding-top: 60px;
        padding-bottom: 60px;
      }
    }
    .section-title {
      font-size: 2.2rem;
      margin-bottom: 1rem;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: "";
      display: block;
      width: 50px;
      height: 3px;
      background: var(--aurora-cyan);
      margin-top: 8px;
    }