/* roulang page: index */
:root {
      --primary-purple: #7B2FF7;
      --primary-blue: #00D4FF;
      --accent-neon: #00F0A8;
      --accent-warning: #FF6B35;
      --bg-deep: #0A0E1A;
      --card-bg: #1A1F2E;
      --border-light: #2A3040;
      --text-body: #B0B8CC;
      --text-title: #FFFFFF;
      --text-muted: #8A92A4;
      --glass-bg: rgba(255,255,255,0.03);
      --glass-border: rgba(255,255,255,0.08);
      --glass-highlight: rgba(255,255,255,0.1);
      --shadow-card: 0 4px 24px rgba(0,212,255,0.08);
      --shadow-hover: 0 8px 48px rgba(123,47,247,0.25);
      --radius-lg: 24px;
      --radius-card: 16px;
      --radius-btn: 50px;
      --radius-input: 12px;
      --radius-tag: 6px;
      --font-zh: 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-en: 'Inter', 'SF Pro Display', sans-serif;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-zh);
      background-color: var(--bg-deep);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 15px;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 40px;
    }

    img {
      max-width: 100%;
      display: block;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

    button, input {
      font-family: inherit;
      border: none;
      outline: none;
    }

    /* 导航 */
    .nav-bar {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 1000;
      background: rgba(10,14,26,0.85);
      backdrop-filter: blur(30px);
      border-bottom: 1px solid rgba(123,47,247,0.3);
      transition: background 0.3s ease, box-shadow 0.3s ease;
    }
    .nav-bar.scrolled {
      background: rgba(10,14,26,0.98);
      box-shadow: 0 0 24px rgba(0,212,255,0.2);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      display: flex;
      align-items: baseline;
      gap: 6px;
      font-family: var(--font-en);
    }
    .logo-cn {
      font-size: 28px;
      font-weight: 800;
      background: linear-gradient(135deg, var(--primary-purple), var(--primary-blue));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 2px;
    }
    .logo-en {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-muted);
      letter-spacing: 0.05em;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      color: var(--text-body);
      font-weight: 500;
      font-size: 15px;
      transition: color 0.2s;
    }
    .nav-links a:hover {
      color: var(--primary-blue);
    }
    .lang-icon {
      color: var(--text-body);
      font-size: 18px;
      cursor: pointer;
    }
    .hamburger {
      display: none;
      font-size: 24px;
      color: white;
      cursor: pointer;
    }
    .mobile-menu {
      display: none;
    }

    /* 首屏 Hero */
    .hero {
      padding: 160px 0 120px;
      background: radial-gradient(circle at 20% 20%, rgba(123,47,247,0.15), transparent 50%);
      position: relative;
      overflow: hidden;
    }
    .hero .container {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-left {
      flex: 0 0 50%;
    }
    .hero-right {
      flex: 1;
      display: flex;
      justify-content: center;
      align-items: center;
      position: relative;
    }
    .badge {
      display: inline-block;
      background: var(--accent-neon);
      color: var(--bg-deep);
      font-size: 13px;
      font-weight: 700;
      padding: 8px 18px;
      border-radius: var(--radius-tag);
      letter-spacing: 0.5px;
      margin-bottom: 24px;
    }
    .hero h1 {
      font-size: 56px;
      font-weight: 800;
      line-height: 1.1;
      background: linear-gradient(135deg, var(--primary-purple), var(--primary-blue));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 24px;
    }
    .hero-sub {
      font-size: 16px;
      color: var(--text-body);
      margin-bottom: 40px;
      max-width: 480px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 24px;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary-purple), var(--primary-blue));
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 16px;
      cursor: pointer;
      box-shadow: 0 0 30px rgba(0,212,255,0.5), 0 0 60px rgba(123,47,247,0.3);
      transition: all 0.3s ease;
      border: none;
    }
    .btn-primary:hover {
      box-shadow: 0 0 80px rgba(0,212,255,0.7), 0 0 100px rgba(123,47,247,0.5);
      transform: translateY(-2px);
    }
    .btn-ghost {
      background: transparent;
      border: 2px solid var(--primary-blue);
      color: var(--primary-blue);
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 16px;
      cursor: pointer;
      transition: all 0.3s;
    }
    .btn-ghost:hover {
      background: linear-gradient(135deg, var(--primary-purple), var(--primary-blue));
      color: white;
      border-color: transparent;
    }
    .hero-stats {
      color: var(--accent-neon);
      font-weight: 600;
      font-size: 14px;
    }
    .cards-stack {
      position: relative;
      width: 320px;
      height: 400px;
    }
    .stack-card {
      position: absolute;
      width: 260px;
      height: 340px;
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      overflow: hidden;
    }
    .stack-card img {
      height: 100%;
      object-fit: cover;
    }
    .stack-card:nth-child(1) { top: 0; left: 0; transform: rotate(-5deg); z-index: 2; }
    .stack-card:nth-child(2) { top: 20px; left: 30px; transform: rotate(2deg); z-index: 1; }
    .stack-card:nth-child(3) { top: 40px; left: 60px; transform: rotate(8deg); z-index: 0; }
    .particles {
      position: absolute;
      top:0;left:0;width:100%;height:100%;pointer-events:none;
    }

    /* 通用板块标题 */
    .section-title {
      font-size: 40px;
      font-weight: 700;
      color: var(--text-title);
      margin-bottom: 16px;
      text-align: center;
    }
    .section-sub {
      color: var(--text-muted);
      text-align: center;
      margin-bottom: 60px;
      font-size: 16px;
    }

    /* 亮点网格 */
    .advantages {
      padding: 100px 0;
    }
    .grid-6 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .adv-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 32px;
      transition: all 0.3s ease;
    }
    .adv-card:hover {
      border-color: var(--primary-blue);
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .adv-icon {
      font-size: 28px;
      color: var(--accent-neon);
      margin-bottom: 20px;
    }
    .adv-card h3 {
      font-size: 22px;
      font-weight: 600;
      color: var(--text-title);
      margin-bottom: 12px;
    }

    /* 案例瀑布流 */
    .cases {
      padding: 100px 0;
    }
    .masonry {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      grid-auto-rows: 280px;
    }
    .case-card {
      position: relative;
      border-radius: var(--radius-card);
      overflow: hidden;
      background: var(--card-bg);
    }
    .case-card img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .case-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      background: linear-gradient(to top, rgba(0,0,0,0.8), transparent);
      padding: 24px;
      color: white;
    }
    .case-overlay h3 {
      font-size: 20px;
      font-weight: 600;
    }
    .case-tag {
      font-size: 12px;
      color: var(--accent-neon);
    }
    .case-card:hover .case-overlay {
      background: linear-gradient(to top, rgba(0,0,0,0.95), rgba(0,0,0,0.2));
    }
    .case-card:hover .case-detail {
      opacity: 1;
    }
    .case-detail {
      opacity: 0;
      transition: 0.3s;
      color: white;
      margin-top: 8px;
    }
    .capsule-cta {
      display: inline-block;
      background: var(--accent-neon);
      color: var(--bg-deep);
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      margin-top: 40px;
      text-align: center;
    }

    /* 方案对比 */
    .solutions {
      padding: 100px 0;
    }
    .compare-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .plan-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 40px 32px;
      text-align: center;
    }
    .plan-popular {
      border-color: var(--primary-blue);
      box-shadow: 0 0 20px rgba(0,212,255,0.3);
    }
    .plan-badge {
      background: var(--accent-neon);
      color: var(--bg-deep);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 12px;
      font-weight: 700;
      margin-bottom: 16px;
      display: inline-block;
    }
    .plan-list {
      list-style: none;
      text-align: left;
      margin: 24px 0;
    }
    .plan-list li {
      margin: 12px 0;
      color: var(--text-body);
    }
    .plan-list i {
      color: var(--primary-blue);
      margin-right: 8px;
    }

    /* 跑马灯 */
    .partners {
      padding: 80px 0;
      overflow: hidden;
      white-space: nowrap;
    }
    .marquee {
      display: flex;
      animation: scroll 20s linear infinite;
      gap: 60px;
    }
    @keyframes scroll {
      0% { transform: translateX(0); }
      100% { transform: translateX(-50%); }
    }
    .partner-item {
      font-size: 24px;
      font-weight: 600;
      color: rgba(255,255,255,0.5);
      white-space: nowrap;
    }
    .data-highlight {
      font-size: 48px;
      font-weight: 800;
      color: var(--accent-neon);
    }

    /* FAQ */
    .faq {
      padding: 100px 0;
    }
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 24px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-size: 20px;
      font-weight: 600;
      color: var(--text-title);
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-body);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 12px;
    }

    /* CTA */
    .contact-cta {
      background: var(--card-bg);
      padding: 100px 0;
      text-align: center;
    }
    .contact-form {
      display: flex;
      justify-content: center;
      gap: 12px;
      margin-top: 32px;
    }
    .contact-form input {
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: var(--radius-input);
      padding: 14px 20px;
      color: white;
      width: 300px;
    }
    .contact-form input:focus {
      border-color: var(--primary-blue);
      box-shadow: 0 0 12px rgba(0,212,255,0.3);
    }

    /* 页脚 */
    .footer {
      background: #060912;
      padding: 60px 0 30px;
      border-top: 1px solid rgba(123,47,247,0.3);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer-bottom {
      text-align: center;
      margin-top: 40px;
      color: var(--text-muted);
    }

    @media (max-width: 1024px) {
      .hero .container { flex-direction: column; }
      .grid-6 { grid-template-columns: repeat(2,1fr); }
      .masonry { grid-template-columns: repeat(2,1fr); }
      .compare-grid { grid-template-columns: 1fr; max-width: 400px; margin:0 auto; }
    }
    @media (max-width: 768px) {
      .container { padding: 0 20px; }
      .nav-links { display: none; }
      .hamburger { display: block; }
      .hero h1 { font-size: 40px; }
      .grid-6 { grid-template-columns: 1fr; }
      .masonry { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .cards-stack { width: 260px; height: 320px; }
    }