/* roulang page: index */
:root {
      --black: #1A1A1A;
      --gold: #D4AF37;
      --warm-gray: #F5F5F0;
      --accent-red: #C41E3A;
      --white: #FFFFFF;
      --text-dark: #2C2C2C;
      --text-muted: #6B6B6B;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-btn: 4px;
      --shadow-light: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.08);
      --transition: 0.2s ease;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--white);
      color: var(--text-dark);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.15s ease;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      outline: none;
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(10px);
      z-index: 1000;
      border-bottom: 1px solid rgba(0,0,0,0.04);
      transition: background 0.3s;
    }
    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      display: flex;
      align-items: baseline;
      gap: 8px;
      font-weight: 700;
      font-size: 24px;
      letter-spacing: 1px;
      color: var(--black);
    }
    .logo .vip-badge {
      font-size: 12px;
      background: var(--gold);
      color: var(--black);
      padding: 2px 8px;
      border-radius: 10px;
      font-weight: 600;
      letter-spacing: 0.5px;
      margin-left: 4px;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-dark);
      position: relative;
      padding: 8px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%) scaleX(0);
      width: 100%;
      height: 2px;
      background: var(--gold);
      transition: transform 0.25s ease;
      transform-origin: center;
    }
    .nav-links a:hover {
      color: var(--gold);
    }
    .nav-links a:hover::after {
      transform: translateX(-50%) scaleX(1);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
      padding: 8px;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--black);
      transition: 0.3s;
      display: block;
    }
    @media (max-width: 768px) {
      .hamburger {
        display: flex;
      }
      .nav-links {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(255,255,255,0.98);
        backdrop-filter: blur(12px);
        flex-direction: column;
        padding: 32px;
        gap: 24px;
        transform: translateY(-150%);
        transition: transform 0.35s ease;
        box-shadow: 0 10px 25px rgba(0,0,0,0.05);
      }
      .nav-links.active {
        transform: translateY(0);
      }
      .nav-links a {
        font-size: 20px;
      }
    }
    /* 按钮 */
    .btn-primary {
      background: var(--gold);
      color: var(--black);
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: background 0.2s, transform 0.2s ease;
      border: 1px solid transparent;
    }
    .btn-primary:hover {
      background: #b8962e;
      transform: translateX(2px);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--gold);
      color: var(--gold);
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      transition: all 0.2s ease;
    }
    .btn-outline:hover {
      background: var(--gold);
      color: var(--black);
    }
    .section {
      padding: 120px 0;
    }
    @media (max-width: 768px) {
      .section {
        padding: 80px 0;
      }
    }
    h2 {
      font-size: 40px;
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 16px;
      margin-bottom: 48px;
    }
    h2::before {
      content: '';
      display: inline-block;
      width: 40px;
      height: 2px;
      background: var(--gold);
    }
    @media (max-width: 768px) {
      h2 {
        font-size: 28px;
      }
    }
    /* Hero */
    .hero {
      display: flex;
      align-items: center;
      gap: 60px;
      min-height: 90vh;
      padding-top: 100px;
    }
    .hero-left {
      flex: 0 0 55%;
      animation: fadeUp 0.8s ease;
    }
    .hero-right {
      flex: 0 0 45%;
      position: relative;
      animation: fadeInRight 0.8s ease;
    }
    .hero h1 {
      font-size: 56px;
      font-weight: 700;
      line-height: 1.1;
      letter-spacing: -0.5px;
      color: var(--black);
      margin-bottom: 24px;
    }
    .hero-sub {
      font-size: 20px;
      color: var(--text-muted);
      margin-bottom: 16px;
      font-weight: 400;
    }
    .hero-desc {
      color: var(--text-muted);
      margin-bottom: 32px;
      max-width: 480px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-img {
      width: 100%;
      border-radius: var(--radius-md);
      box-shadow: 0 20px 35px rgba(0,0,0,0.08);
      border: 1px solid rgba(212,175,55,0.2);
    }
    .live-badge {
      position: absolute;
      bottom: 16px;
      right: 16px;
      background: rgba(26,26,26,0.8);
      backdrop-filter: blur(8px);
      color: white;
      padding: 8px 18px;
      border-radius: 20px;
      font-size: 14px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .live-dot {
      width: 8px;
      height: 8px;
      background: var(--accent-red);
      border-radius: 50%;
      animation: pulse 1.5s infinite;
    }
    @keyframes fadeUp {
      from { opacity: 0; transform: translateY(30px); }
      to { opacity: 1; transform: translateY(0); }
    }
    @keyframes fadeInRight {
      from { opacity: 0; transform: translateX(30px); }
      to { opacity: 1; transform: translateX(0); }
    }
    @keyframes pulse {
      0%,100% { opacity: 1; }
      50% { opacity: 0.4; }
    }
    @media (max-width: 768px) {
      .hero {
        flex-direction: column;
        gap: 40px;
      }
      .hero-left, .hero-right {
        flex: auto;
        width: 100%;
      }
      .hero h1 {
        font-size: 36px;
      }
    }
    /* 网格特色 */
    .features-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 24px;
    }
    .feature-main {
      grid-row: span 2;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: var(--radius-md);
      padding: 48px;
      display: flex;
      flex-direction: column;
      justify-content: flex-end;
      min-height: 360px;
      position: relative;
      overflow: hidden;
    }
    .feature-main::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(0deg, rgba(0,0,0,0.7) 0%, rgba(0,0,0,0.2) 100%);
    }
    .feature-main h3, .feature-main p {
      position: relative;
      color: white;
    }
    .feature-card {
      background: var(--warm-gray);
      border-radius: var(--radius-sm);
      padding: 32px;
      transition: all 0.25s;
      box-shadow: var(--shadow-light);
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .feature-card h3 {
      font-size: 22px;
      margin: 16px 0 8px;
    }
    @media (max-width: 768px) {
      .features-grid {
        grid-template-columns: 1fr;
      }
      .feature-main {
        grid-row: auto;
      }
    }
    /* 服务瀑布 */
    .service-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 100px;
    }
    .service-row.reverse {
      flex-direction: row-reverse;
    }
    .service-img {
      flex: 1;
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: transform 0.4s ease;
    }
    .service-img:hover {
      transform: scale(1.03);
    }
    .service-text {
      flex: 1;
      position: relative;
    }
    .service-number {
      font-size: 64px;
      font-weight: 700;
      color: rgba(0,0,0,0.03);
      position: absolute;
      top: -30px;
      left: 0;
    }
    @media (max-width: 768px) {
      .service-row, .service-row.reverse {
        flex-direction: column;
        gap: 30px;
      }
    }
    /* 方案对比 */
    .plans {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .plan-card {
      background: var(--warm-gray);
      padding: 40px 28px;
      border-radius: var(--radius-md);
      position: relative;
      border: 1px solid transparent;
      transition: all 0.25s;
    }
    .plan-card.featured {
      background: white;
      border-left: 4px solid var(--gold);
      box-shadow: var(--shadow-hover);
    }
    .plan-tag {
      background: var(--gold);
      color: var(--black);
      font-size: 12px;
      font-weight: 600;
      padding: 4px 12px;
      border-radius: 12px;
      display: inline-block;
      margin-bottom: 16px;
    }
    @media (max-width: 768px) {
      .plans {
        grid-template-columns: 1fr;
      }
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid #e0e0e0;
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-muted);
    }
    /* 联系 */
    .contact-section {
      background: var(--black);
      color: white;
      display: flex;
      gap: 60px;
      padding: 80px 0;
    }
    .contact-form input, .contact-form textarea {
      background: transparent;
      border: none;
      border-bottom: 1px solid var(--gold);
      padding: 12px 0;
      width: 100%;
      color: white;
      outline: none;
    }
    @media (max-width: 768px) {
      .contact-section {
        flex-direction: column;
      }
    }
    footer {
      background: var(--black);
      color: #aaa;
      padding: 40px 0;
      font-size: 14px;
    }