/* roulang page: index */
:root {
      --bg-deep: #0A0F1E;
      --bg-mid: #0D1B2A;
      --bg-card: rgba(10, 20, 35, 0.7);
      --border-light: rgba(255, 255, 255, 0.08);
      --border-glow: rgba(0, 229, 255, 0.4);
      --text-soft: #C0D0E0;
      --text-dim: #8090A8;
      --text-cyan: #00E5FF;
      --cyan-glow: rgba(0, 229, 255, 0.15);
      --amber-soft: #FFB74D;
      --primary-glow: rgba(0, 198, 255, 0.5);
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --radius-lg: 16px;
      --radius-sm: 8px;
      --font-h1: 700 48px/1.2 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, sans-serif;
      --font-h2: 600 36px/1.3 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, sans-serif;
      --font-h3: 500 22px/1.4 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, sans-serif;
      --font-body: 400 16px/1.7 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, sans-serif;
      --font-sm: 14px/1.5 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, sans-serif;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      background: linear-gradient(135deg, #0A0F1E 0%, #0D1B2A 40%, #1B2A3A 100%);
      background-attachment: fixed;
      font: var(--font-body);
      color: var(--text-soft);
      letter-spacing: 0.01em;
      min-height: 100vh;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.3s, border-color 0.3s;
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, input {
      font-family: inherit;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 20px;
      width: 100%;
    }
    /* 顶部信息条 */
    .top-bar {
      background: rgba(0,0,0,0.5);
      height: 36px;
      font-size: 12px;
      color: #8899AA;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 20px;
      position: relative;
      z-index: 1001;
    }
    .top-bar .domain {
      display: flex;
      gap: 16px;
      align-items: center;
    }
    .top-bar .contact-link {
      color: #B0C8E0;
      transition: color 0.2s;
    }
    .top-bar .contact-link:hover {
      color: #00E5FF;
    }
    /* 主导航 */
    .main-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(10, 15, 30, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255,255,255,0.05);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      font-size: 28px;
      font-weight: 700;
      color: #00E5FF;
      text-shadow: 0 0 12px rgba(0,229,255,0.4);
      letter-spacing: 1px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      font-size: 16px;
      color: #B0C8E0;
      position: relative;
      padding: 4px 0;
    }
    .nav-links a:hover {
      color: #00E5FF;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -2px;
      width: 0%;
      height: 1px;
      background: #00E5FF;
      box-shadow: 0 0 8px #00E5FF;
      transition: width 0.3s;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-primary-sm {
      background: linear-gradient(135deg, #00C6FF, #0072FF);
      border: none;
      color: white;
      border-radius: 50px;
      padding: 10px 24px;
      font-weight: 600;
      font-size: 15px;
      cursor: pointer;
      box-shadow: 0 0 18px rgba(0,198,255,0.5);
      transition: all 0.3s;
      white-space: nowrap;
    }
    .btn-primary-sm:hover {
      box-shadow: 0 0 28px rgba(0,198,255,0.7);
      transform: translateY(-2px);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      justify-content: space-between;
      width: 28px;
      height: 22px;
      background: transparent;
      border: none;
      cursor: pointer;
    }
    .hamburger span {
      height: 2px;
      background: #B0C8E0;
      border-radius: 2px;
      transition: all 0.3s;
    }
    /* Hero */
    .hero {
      padding: 80px 0 100px;
      display: flex;
      align-items: center;
      gap: 40px;
    }
    .hero-left {
      flex: 0 0 55%;
    }
    .hero-right {
      flex: 1;
      position: relative;
    }
    .hero h1 {
      font: var(--font-h1);
      color: #FFFFFF;
      margin-bottom: 24px;
      letter-spacing: -0.5px;
    }
    .hero-sub {
      font-size: 18px;
      color: #B0D0F0;
      margin-bottom: 36px;
      max-width: 480px;
    }
    .btn-group {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, #00C6FF, #0072FF);
      border: none;
      color: white;
      border-radius: 50px;
      padding: 14px 36px;
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      box-shadow: 0 0 20px rgba(0,198,255,0.5);
      transition: all 0.3s;
    }
    .btn-primary:hover {
      box-shadow: 0 0 30px rgba(0,198,255,0.7);
      transform: translateY(-2px);
    }
    .btn-ghost {
      background: transparent;
      border: 1px solid rgba(0,229,255,0.4);
      color: #00E5FF;
      border-radius: 50px;
      padding: 14px 36px;
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      transition: all 0.3s;
    }
    .btn-ghost:hover {
      border-color: #00E5FF;
      background: rgba(0,229,255,0.08);
    }
    .hero-visual {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      background-blend-mode: overlay;
      width: 100%;
      aspect-ratio: 4/3;
      border-radius: 24px;
      box-shadow: 0 0 40px rgba(0,80,120,0.5);
      background-color: rgba(10,20,35,0.5);
    }
    /* 通用板块标题 */
    .section-title {
      text-align: center;
      margin-bottom: 60px;
    }
    .section-title h2 {
      font: var(--font-h2);
      color: #E0F0FF;
      margin-bottom: 12px;
    }
    .section-title h3 {
      font: var(--font-h3);
      color: #B0D0F0;
      font-weight: 400;
    }
    section {
      padding: 100px 0;
    }
    /* 亮点网格 */
    .grid-highlights {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .highlight-card {
      background: rgba(255,255,255,0.04);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(255,255,255,0.08);
      border-radius: var(--radius-lg);
      padding: 32px;
      transition: all 0.3s;
      box-shadow: var(--shadow-card);
    }
    .highlight-card:hover {
      background: rgba(255,255,255,0.08);
      border-color: rgba(255,255,255,0.15);
      box-shadow: 0 0 20px var(--cyan-glow);
      transform: translateY(-6px);
    }
    .icon-placeholder {
      width: 48px;
      height: 48px;
      background: rgba(0,229,255,0.15);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 24px;
      color: #00E5FF;
      font-size: 24px;
    }
    .highlight-card h4 {
      font-size: 20px;
      font-weight: 600;
      color: #E0F0FF;
      margin-bottom: 12px;
    }
    .highlight-card p {
      font-size: 14px;
      color: #9AAEC9;
    }
    /* 案例瀑布 */
    .case-waterfall {
      columns: 3 260px;
      column-gap: 24px;
    }
    .case-card {
      break-inside: avoid;
      margin-bottom: 24px;
      background: rgba(255,255,255,0.04);
      border-radius: 16px;
      overflow: hidden;
      border: 1px solid rgba(255,255,255,0.08);
      transition: all 0.3s;
    }
    .case-card:hover {
      transform: translateY(-6px);
      box-shadow: 0 12px 30px rgba(0,0,0,0.5);
    }
    .case-img {
      width: 100%;
      aspect-ratio: 3/2;
      object-fit: cover;
      transition: transform 0.3s;
    }
    .case-card:hover .case-img {
      transform: scale(1.03);
    }
    .case-content {
      padding: 20px;
    }
    .case-content h4 {
      font-weight: 600;
      font-size: 18px;
      color: #E0F0FF;
      margin-bottom: 8px;
    }
    .tag {
      background: rgba(0,229,255,0.15);
      color: #00E5FF;
      font-size: 12px;
      padding: 4px 10px;
      border-radius: 20px;
      display: inline-block;
      margin-top: 8px;
    }
    /* 方案对比 */
    .compare-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      align-items: start;
    }
    .plan-card {
      background: rgba(255,255,255,0.03);
      border-radius: 20px;
      padding: 36px 24px;
      border: 1px solid rgba(255,255,255,0.07);
      text-align: center;
      transition: 0.3s;
    }
    .plan-highlight {
      border: 1px solid #00E5FF;
      box-shadow: 0 0 24px rgba(0,229,255,0.25);
      position: relative;
    }
    .badge {
      background: #00E5FF;
      color: #0A0F1E;
      font-weight: 700;
      font-size: 14px;
      padding: 6px 16px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 16px;
    }
    .plan-name {
      font-size: 24px;
      font-weight: 600;
      color: white;
      margin: 16px 0;
    }
    .plan-list {
      list-style: none;
      color: #B0C8E0;
      margin: 20px 0;
      text-align: left;
    }
    /* 流程 */
    .steps {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      gap: 0;
      position: relative;
    }
    .step-item {
      text-align: center;
      flex: 1;
    }
    .step-circle {
      width: 56px;
      height: 56px;
      border-radius: 50%;
      border: 2px solid rgba(0,229,255,0.6);
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 20px;
      font-weight: 700;
      font-size: 22px;
      color: #00E5FF;
      background: rgba(0,0,0,0.4);
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.08);
      padding: 20px 0;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      color: #E0F0FF;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s;
      color: #B0C8E0;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }
    /* CTA横幅 */
    .cta-banner {
      background: rgba(0,0,0,0.4);
      backdrop-filter: blur(10px);
      border-radius: 32px;
      text-align: center;
      padding: 80px 20px;
    }
    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.06);
      margin-top: 40px;
      padding-top: 24px;
      color: #8899AA;
    }
    @media (max-width: 1024px) {
      .hero { flex-direction: column; }
      .grid-highlights { grid-template-columns: repeat(2,1fr); }
      .compare-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .grid-highlights { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .steps { flex-direction: column; gap: 30px; }
    }