/* roulang page: index */
:root {
      --deep-blue: #1A1A2E;
      --deep-blue-variant: #16213E;
      --star-gold: #E8B93A;
      --aurora-cyan: #4ECDC4;
      --bg-light: #F8F9FC;
      --card-bg: #FFFFFF;
      --text-primary: #2C3E50;
      --text-secondary: #5A6C7D;
      --text-on-dark: #FFFFFF;
      --border-light: rgba(0,0,0,0.06);
      --radius-card: 16px;
      --radius-btn: 50px;
      --radius-input: 12px;
      --shadow-card: 0 4px 20px rgba(26,26,46,0.06);
      --shadow-card-hover: 0 12px 32px rgba(26,26,46,0.12);
      --shadow-nav: 0 2px 20px rgba(0,0,0,0.06);
      --font-title: 'Noto Sans SC', sans-serif;
      --font-body: 'Inter', 'Noto Sans SC', sans-serif;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      color: var(--text-primary);
      background-color: var(--bg-light);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }
    h1, h2, h3, h4 {
      font-family: var(--font-title);
      font-weight: 700;
      letter-spacing: -0.2px;
    }
    a {
      text-decoration: none;
      transition: all 0.25s ease;
    }
    img {
      max-width: 100%;
      height: auto;
    }
    .section-padding {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      .section-padding {
        padding: 60px 0;
      }
    }

    /* 导航栏 */
    .navbar {
      padding: 16px 0;
      transition: background 0.3s, box-shadow 0.3s, backdrop-filter 0.3s;
      background: transparent;
    }
    .navbar.scrolled {
      background: rgba(255,255,255,0.94);
      backdrop-filter: blur(12px);
      box-shadow: var(--shadow-nav);
    }
    .navbar .navbar-brand {
      font-family: var(--font-title);
      font-weight: 900;
      font-size: 1.8rem;
      color: #fff;
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 8px;
      transition: color 0.3s;
    }
    .navbar.scrolled .navbar-brand {
      color: var(--deep-blue);
    }
    .navbar .nav-link {
      font-weight: 500;
      color: rgba(255,255,255,0.9);
      margin: 0 8px;
      transition: color 0.3s;
    }
    .navbar.scrolled .nav-link {
      color: var(--text-primary);
    }
    .navbar .nav-link:hover,
    .navbar .nav-link.active {
      color: var(--star-gold) !important;
    }
    .btn-outline-aurora {
      border: 2px solid var(--aurora-cyan);
      color: var(--aurora-cyan);
      background: transparent;
      border-radius: var(--radius-btn);
      padding: 10px 28px;
      font-weight: 600;
      transition: all 0.3s;
    }
    .btn-outline-aurora:hover {
      background: var(--aurora-cyan);
      color: var(--deep-blue);
      border-color: var(--aurora-cyan);
    }
    .btn-solid-gold {
      background: var(--star-gold);
      color: var(--deep-blue);
      font-weight: 700;
      border-radius: var(--radius-btn);
      padding: 12px 32px;
      border: none;
      transition: all 0.3s;
    }
    .btn-solid-gold:hover {
      background: #F0C94D;
      box-shadow: 0 0 18px rgba(232,185,58,0.5);
      color: var(--deep-blue);
    }
    .navbar-toggler {
      border: none;
      color: white;
    }
    .navbar.scrolled .navbar-toggler {
      color: var(--deep-blue);
    }
    @media (max-width: 992px) {
      .navbar-collapse {
        background: rgba(26,26,46,0.96);
        backdrop-filter: blur(20px);
        padding: 24px;
        border-radius: 20px;
        margin-top: 16px;
      }
      .navbar.scrolled .navbar-collapse {
        background: rgba(255,255,255,0.98);
        box-shadow: var(--shadow-nav);
      }
      .navbar .nav-link {
        color: white !important;
        font-size: 1.2rem;
        padding: 12px 0;
      }
      .navbar.scrolled .nav-link {
        color: var(--deep-blue) !important;
      }
    }

    /* Hero 区块 */
    .hero-section {
      min-height: 100vh;
      background: linear-gradient(125deg, rgba(26,26,46,0.75) 0%, rgba(22,33,62,0.8) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      color: white;
    }
    .hero-content {
      text-align: center;
      max-width: 900px;
      padding: 0 20px;
    }
    .hero-content h1 {
      font-size: 3.5rem;
      font-weight: 900;
      line-height: 1.2;
      margin-bottom: 1.5rem;
    }
    .hero-content .lead {
      font-size: 1.25rem;
      opacity: 0.9;
      margin-bottom: 2.5rem;
    }
    @media (max-width: 768px) {
      .hero-content h1 {
        font-size: 2.2rem;
      }
      .hero-content .lead {
        font-size: 1rem;
      }
    }
    .star-particles {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
      overflow: hidden;
    }
    .star-particle {
      position: absolute;
      background: white;
      border-radius: 50%;
      opacity: 0.7;
      animation: twinkle 3s infinite alternate;
    }
    @keyframes twinkle {
      0% { opacity: 0.3; transform: scale(0.8); }
      100% { opacity: 0.9; transform: scale(1.2); }
    }

    /* 区块标题 */
    .section-title {
      font-size: 2.25rem;
      font-weight: 700;
      margin-bottom: 1rem;
    }
    .section-subtitle {
      color: var(--text-secondary);
      font-size: 1.1rem;
      margin-bottom: 3rem;
    }

    /* 服务卡片 */
    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: transform 0.3s, box-shadow 0.3s;
      height: 100%;
      border: 1px solid transparent;
    }
    .service-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-card-hover), inset 0 0 0 1px rgba(232,185,58,0.3);
    }
    .icon-circle {
      width: 64px;
      height: 64px;
      background: rgba(78,205,196,0.12);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 24px;
      color: var(--aurora-cyan);
      font-size: 2rem;
    }
    .service-card:hover .icon-circle {
      background: var(--star-gold);
      color: var(--deep-blue);
    }

    /* 优势数据 */
    .stats-section {
      background-color: #F0F2F8;
      background-image: radial-gradient(circle at 20% 30%, rgba(232,185,58,0.03) 1px, transparent 1px);
      background-size: 40px 40px;
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 900;
      color: var(--star-gold);
    }
    .stat-label {
      color: var(--text-secondary);
      font-weight: 500;
    }

    /* 案例卡片 */
    .case-card {
      border-radius: var(--radius-card);
      overflow: hidden;
      background: white;
      box-shadow: var(--shadow-card);
      transition: transform 0.3s;
      position: relative;
    }
    .case-card:hover {
      transform: translateY(-6px);
    }
    .case-img {
      height: 220px;
      object-fit: cover;
      width: 100%;
    }
    .case-overlay {
      position: absolute;
      top: 0; left: 0; width: 100%; height: 220px;
      background: rgba(26,26,46,0.7);
      display: flex; align-items: center; justify-content: center;
      opacity: 0; transition: 0.3s;
      color: white;
    }
    .case-card:hover .case-overlay {
      opacity: 1;
    }

    /* 流程步骤 */
    .step-line {
      border-top: 2px dashed var(--star-gold);
      flex: 1;
      margin: 0 8px;
    }
    .step-circle {
      width: 48px; height: 48px;
      background: var(--aurora-cyan);
      color: white;
      border-radius: 50%;
      display: flex; align-items: center; justify-content: center;
      font-weight: 700;
    }

    /* FAQ */
    .accordion-button {
      font-weight: 600;
      background: white;
      box-shadow: none;
      border-left: 4px solid var(--aurora-cyan);
    }
    .accordion-button:not(.collapsed) {
      background: white;
      border-left-color: var(--star-gold);
      color: var(--deep-blue);
    }

    /* CTA 横幅 */
    .cta-banner {
      background: var(--deep-blue);
      position: relative;
      overflow: hidden;
    }

    /* 页脚 */
    .footer {
      background: var(--deep-blue-variant);
      color: #ccc;
    }
    .social-icon {
      width: 40px; height: 40px;
      border: 2px solid var(--aurora-cyan);
      border-radius: 50%;
      display: inline-flex; align-items: center; justify-content: center;
      color: var(--aurora-cyan);
      margin-right: 10px;
      transition: 0.3s;
    }
    .social-icon:hover {
      background: var(--aurora-cyan);
      color: var(--deep-blue);
    }