/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    :root {
      --primary-purple: #7B2FF7;
      --primary-red: #F7295A;
      --deep-black: #0D0F1A;
      --white: #FFFFFF;
      --light-gray: #F8F9FC;
      --text-dark: #1E1E24;
      --text-muted: #6B6E7B;
      --accent-cyan: #00E5FF;
      --success-green: #00C853;
      --gradient-main: linear-gradient(135deg, #7B2FF7 0%, #F7295A 100%);
      --border-radius-card: 20px;
      --border-radius-btn: 50px;
      --shadow-card: 0 8px 30px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 16px 40px rgba(123,47,247,0.12);
      --shadow-btn-glow: 0 0 20px rgba(247,41,90,0.4);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--white);
      color: var(--text-dark);
      line-height: 1.6;
      scroll-behavior: smooth;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 32px;
      background: transparent;
      transition: background 0.3s ease, backdrop-filter 0.3s;
    }

    .navbar.scrolled {
      background: rgba(13,15,26,0.85);
      backdrop-filter: blur(12px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.2);
    }

    .logo {
      font-size: 26px;
      font-weight: 700;
      background: var(--gradient-main);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .logo i {
      background: none;
      -webkit-text-fill-color: var(--accent-cyan);
      font-size: 24px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-links a {
      text-decoration: none;
      color: rgba(255,255,255,0.85);
      font-weight: 500;
      font-size: 15px;
      transition: color 0.2s;
      position: relative;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent-cyan);
    }

    .nav-cta {
      background: var(--gradient-main);
      padding: 10px 26px;
      border-radius: var(--border-radius-btn);
      color: white !important;
      font-weight: 600;
      box-shadow: 0 4px 15px rgba(247,41,90,0.3);
    }

    .mobile-bottom-nav {
      display: none;
    }

    /* Hero */
    #hero {
      background: var(--deep-black);
      position: relative;
      overflow: hidden;
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding-top: 72px;
    }

    .hero-glow {
      position: absolute;
      top: -20%;
      right: -10%;
      width: 700px;
      height: 700px;
      background: radial-gradient(circle, rgba(123,47,247,0.25) 0%, rgba(247,41,90,0.1) 50%, transparent 70%);
      border-radius: 50%;
      pointer-events: none;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 40px;
      width: 100%;
    }

    .hero-left {
      flex: 1 1 60%;
      position: relative;
      z-index: 2;
    }

    .hero-right {
      flex: 1 1 40%;
      display: flex;
      justify-content: center;
      animation: float 5s ease-in-out infinite;
    }

    @keyframes float {
      0% { transform: translateY(0px); }
      50% { transform: translateY(-12px); }
      100% { transform: translateY(0px); }
    }

    .hero-right img {
      max-width: 100%;
      height: auto;
      filter: drop-shadow(0 20px 40px rgba(123,47,247,0.3));
    }

    h1 {
      font-size: 52px;
      font-weight: 700;
      line-height: 1.2;
      color: white;
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 36px;
      max-width: 500px;
    }

    .btn-primary {
      background: var(--gradient-main);
      border: none;
      padding: 16px 40px;
      border-radius: var(--border-radius-btn);
      font-weight: 600;
      font-size: 16px;
      color: white;
      cursor: pointer;
      display: inline-block;
      text-decoration: none;
      transition: all 0.3s;
      box-shadow: 0 8px 20px rgba(247,41,90,0.4);
    }

    .btn-primary:hover {
      filter: brightness(1.1);
      box-shadow: var(--shadow-btn-glow);
      transform: translateY(-2px);
    }

    /* section */
    section {
      padding: 100px 0;
    }

    h2 {
      font-size: 38px;
      font-weight: 600;
      margin-bottom: 48px;
      text-align: center;
      color: var(--text-dark);
    }

    /* Highlights */
    #highlights {
      background: var(--white);
    }

    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
      text-align: center;
    }

    .highlight-item .number {
      font-size: 56px;
      font-weight: 800;
      background: linear-gradient(135deg, var(--accent-cyan), #7B2FF7);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      line-height: 1.1;
    }

    .highlight-item .label {
      font-size: 16px;
      color: var(--text-muted);
      margin-top: 10px;
    }

    /* Services */
    #services {
      background: var(--light-gray);
    }

    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .service-card {
      background: white;
      border-radius: var(--border-radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-card);
      transition: all 0.3s;
      display: flex;
      flex-direction: column;
    }

    .service-card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-6px);
      outline: 2px solid transparent;
      outline-offset: 2px;
      background: linear-gradient(white, white) padding-box,
                  linear-gradient(135deg, #7B2FF7, #F7295A) border-box;
      border: 1px solid transparent;
    }

    .service-icon {
      font-size: 40px;
      color: var(--primary-purple);
      margin-bottom: 20px;
    }

    .service-card h3 {
      font-size: 22px;
      margin-bottom: 12px;
    }

    .service-card p {
      color: var(--text-muted);
      margin-bottom: 20px;
      flex: 1;
    }

    .text-link {
      color: var(--accent-cyan);
      text-decoration: none;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 4px;
      transition: gap 0.2s;
    }

    .text-link:hover {
      gap: 8px;
      text-decoration: underline;
    }

    /* Cases 瀑布 */
    #cases {
      background: white;
    }

    .cases-masonry {
      column-count: 2;
      column-gap: 24px;
    }

    .case-card {
      break-inside: avoid;
      margin-bottom: 24px;
      border-radius: 16px;
      overflow: hidden;
      position: relative;
      transition: transform 0.3s, box-shadow 0.3s;
    }

    .case-card img {
      width: 100%;
      display: block;
      transition: transform 0.4s;
    }

    .case-card:hover img {
      transform: scale(1.04);
    }

    .case-info {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      background: linear-gradient(transparent, rgba(0,0,0,0.8));
      padding: 24px 16px 16px;
      color: white;
    }

    .case-info h4 {
      font-size: 18px;
      margin-bottom: 6px;
    }

    .case-tag {
      display: inline-block;
      background: var(--accent-cyan);
      color: black;
      font-size: 12px;
      padding: 2px 10px;
      border-radius: 20px;
    }

    .center-btn {
      text-align: center;
      margin-top: 40px;
    }

    /* Compare */
    #compare {
      background: var(--light-gray);
    }

    .compare-wrapper {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 20px;
    }

    .compare-card {
      background: white;
      border-radius: var(--border-radius-card);
      padding: 36px 24px;
      flex: 1;
      box-shadow: var(--shadow-card);
    }

    .compare-vs {
      font-size: 42px;
      font-weight: 900;
      color: var(--accent-cyan);
      display: flex;
      align-items: center;
      justify-content: center;
      width: 80px;
    }

    .compare-list {
      list-style: none;
      margin: 24px 0;
    }

    .compare-list li {
      margin-bottom: 14px;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .check {
      color: var(--success-green);
    }

    .cross {
      color: #ccc;
    }

    /* FAQ */
    #faq {
      background: white;
    }

    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      border-bottom: 1px solid #eee;
      padding: 20px 0;
      cursor: pointer;
    }

    .faq-question {
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-weight: 600;
      font-size: 18px;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: var(--light-gray);
      border-radius: 12px;
      margin-top: 12px;
      padding: 0 20px;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 20px;
    }

    /* Contact */
    #contact {
      background: var(--light-gray);
    }

    .contact-grid {
      display: flex;
      gap: 40px;
    }

    .contact-left h2 {
      text-align: left;
    }

    .contact-form {
      background: white;
      border-radius: var(--border-radius-card);
      padding: 32px;
      flex: 1;
      box-shadow: var(--shadow-card);
    }

    .form-group {
      margin-bottom: 20px;
    }

    input, select, textarea {
      width: 100%;
      padding: 14px;
      border: 1px solid #ddd;
      border-radius: 12px;
      font-family: inherit;
      background: #f9f9f9;
    }

    /* Footer */
    #footer {
      background: var(--deep-black);
      color: #ccc;
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: white;
      margin-bottom: 16px;
    }

    .footer-col a {
      color: #aaa;
      text-decoration: none;
      display: block;
      margin-bottom: 8px;
    }

    .copyright {
      border-top: 1px solid #222;
      padding-top: 24px;
      text-align: center;
      font-size: 14px;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .services-grid { grid-template-columns: repeat(2,1fr); }
      .compare-wrapper { flex-direction: column; }
      .compare-vs { margin: 16px 0; }
    }

    @media (max-width: 768px) {
      .navbar .nav-links { display: none; }
      .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        background: rgba(13,15,26,0.95);
        backdrop-filter: blur(12px);
        justify-content: space-around;
        padding: 10px 0;
        z-index: 999;
      }
      .mobile-bottom-nav a {
        color: #aaa;
        text-decoration: none;
        font-size: 12px;
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 4px;
      }
      .hero-grid { flex-direction: column; }
      h1 { font-size: 36px; }
      .highlights-grid { grid-template-columns: 1fr; }
      .services-grid { grid-template-columns: 1fr; }
      .cases-masonry { column-count: 1; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .contact-grid { flex-direction: column; }
    }