/* roulang page: index */
:root {
      --deep-charcoal: #1A1A1A;
      --competitive-red: #E63946;
      --warm-gold: #F4A261;
      --light-gray: #F8F9FA;
      --card-bg: #2C2C2C;
      --body-text: #CCCCCC;
      --white: #FFFFFF;
      --border-light: rgba(244, 162, 97, 0.3);
      --shadow-card: 0 8px 24px rgba(0,0,0,0.6);
      --shadow-hover: 0 16px 32px rgba(0,0,0,0.8);
      --radius-card: 14px;
      --radius-btn: 30px;
      --transition: all 0.25s ease;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: 'Noto Sans SC', 'Inter', sans-serif;
      background-color: var(--deep-charcoal);
      color: var(--body-text);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, h4 {
      font-weight: 600;
      color: var(--white);
    }
    h1 {
      font-size: clamp(2.2rem, 6vw, 3.2rem);
      font-weight: 700;
      line-height: 1.2;
    }
    h2 {
      font-size: 2rem;
      font-weight: 600;
      margin-bottom: 1rem;
      letter-spacing: -0.3px;
    }
    h3 {
      font-size: 1.25rem;
      font-weight: 500;
      color: var(--warm-gold);
    }
    h4 {
      font-size: 1.2rem;
      font-weight: 600;
      color: var(--white);
    }
    a {
      color: var(--warm-gold);
      text-decoration: none;
      transition: var(--transition);
    }
    a:hover {
      color: #fff;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    /* 导航 */
    .nav-container {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(26, 26, 26, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      z-index: 99;
      padding: 12px 0;
      transition: var(--transition);
    }
    .nav-grid {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
    }
    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--white);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
    }
    .logo span {
      background: var(--warm-gold);
      width: 10px;
      height: 10px;
      border-radius: 50%;
      margin-left: 6px;
      display: inline-block;
      box-shadow: 0 0 8px var(--warm-gold);
    }
    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    .nav-links a {
      color: var(--white);
      font-weight: 500;
      font-size: 1rem;
      position: relative;
      padding: 4px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--warm-gold);
      transition: width 0.3s;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .cta-btn {
      background: var(--competitive-red);
      color: var(--white) !important;
      padding: 12px 28px !important;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: 0 0 18px rgba(230, 57, 70, 0.6);
      transition: var(--transition);
      border: 1px solid var(--warm-gold);
      white-space: nowrap;
    }
    .cta-btn:hover {
      background: #FF4D5A;
      box-shadow: 0 0 28px rgba(255, 77, 90, 0.8);
      transform: translateY(-1px);
    }
    .hamburger {
      display: none;
      color: white;
      font-size: 2rem;
      cursor: pointer;
    }
    @media (max-width: 840px) {
      .nav-links {
        display: none;
        flex-direction: column;
        width: 100%;
        background: rgba(26,26,26,0.98);
        padding: 20px;
        margin-top: 15px;
        border-radius: 12px;
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: block;
      }
    }
    /* Hero */
    .hero {
      background: linear-gradient(135deg, rgba(26,26,26,0.85) 0%, rgba(20,20,20,0.9) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 85vh;
      display: flex;
      align-items: center;
      text-align: left;
      padding: 100px 0 60px;
      position: relative;
    }
    .hero-content h1 {
      color: var(--white);
      margin-bottom: 1.5rem;
    }
    .hero-content h1 .highlight {
      color: var(--competitive-red);
      text-shadow: 0 0 12px rgba(230,57,70,0.5);
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--body-text);
      margin-bottom: 2rem;
      max-width: 600px;
    }
    .hero-btn-group {
      display: flex;
      align-items: center;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-outline-gold {
      border: 1.5px solid var(--warm-gold);
      color: var(--warm-gold);
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      background: transparent;
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-outline-gold:hover {
      background: rgba(244,162,97,0.15);
      color: white;
    }
    .trust-badge {
      font-size: 0.9rem;
      color: var(--warm-gold);
      display: flex;
      align-items: center;
      gap: 6px;
    }
    /* 区块通用 */
    section {
      padding: 80px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 3rem;
    }
    .section-title h2 {
      color: var(--white);
      position: relative;
      display: inline-block;
    }
    .section-title h2::after {
      content: '';
      position: absolute;
      bottom: -10px;
      left: 50%;
      transform: translateX(-50%);
      width: 70px;
      height: 3px;
      background: var(--competitive-red);
    }
    /* 卡片网格 */
    .card-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 28px;
    }
    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px 20px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      border: 1px solid transparent;
      text-align: center;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: var(--warm-gold);
      background: #353535;
    }
    .icon-gold {
      color: var(--warm-gold);
      font-size: 2.5rem;
      margin-bottom: 1.2rem;
    }
    .service-card h4 {
      margin-bottom: 0.8rem;
    }
    .gold-divider {
      width: 45px;
      height: 2px;
      background: var(--warm-gold);
      margin: 15px auto 0;
    }
    /* 优势数据 */
    .stats-row {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 30px;
      text-align: center;
    }
    .stat-item .big-number {
      font-size: 3rem;
      font-weight: 700;
      color: var(--competitive-red);
      line-height: 1.1;
    }
    .stat-item p {
      color: var(--body-text);
      margin-top: 8px;
    }
    /* 流程 */
    .process-steps {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
      margin-top: 40px;
    }
    .step {
      flex: 1;
      min-width: 180px;
      text-align: center;
    }
    .step-circle {
      width: 65px;
      height: 65px;
      border: 2px solid var(--warm-gold);
      border-radius: 50%;
      margin: 0 auto 18px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--white);
      background: rgba(244,162,97,0.1);
    }
    /* 案例卡片 */
    .case-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .case-card:hover {
      transform: translateY(-5px);
    }
    .case-img {
      position: relative;
    }
    .case-img img {
      aspect-ratio: 16/9;
      object-fit: cover;
    }
    .case-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      background: linear-gradient(transparent, rgba(0,0,0,0.8));
      padding: 25px 15px 15px;
    }
    .case-overlay h4 {
      margin: 0;
    }
    .odds-gold {
      color: var(--warm-gold);
      font-weight: 700;
      font-size: 1.4rem;
    }
    /* FAQ */
    .accordion-item {
      background: var(--card-bg);
      border-radius: 12px;
      margin-bottom: 12px;
      border: 1px solid transparent;
      transition: var(--transition);
    }
    .accordion-item.active {
      border-color: var(--warm-gold);
    }
    .accordion-title {
      padding: 18px 24px;
      font-weight: 600;
      color: var(--white);
      display: flex;
      align-items: center;
      gap: 12px;
      cursor: pointer;
      user-select: none;
    }
    .accordion-title .q-mark {
      color: var(--warm-gold);
      font-weight: 700;
      font-size: 1.4rem;
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background: #222;
      color: var(--body-text);
      padding: 0 24px;
    }
    .accordion-content p {
      padding: 0 0 18px;
    }
    /* CTA 区域 */
    .cta-section {
      background: linear-gradient(0deg, rgba(26,26,26,0.95) 0%, #1e1e1e 100%);
      text-align: center;
      padding: 80px 20px;
    }
    /* 页脚 */
    .footer {
      background: #121212;
      padding: 60px 0 30px;
      color: #aaa;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
      gap: 30px;
      margin-bottom: 40px;
    }
    .footer h5 {
      color: var(--white);
      margin-bottom: 15px;
    }
    .footer a {
      color: #aaa;
      display: block;
      margin-bottom: 8px;
    }
    .social-icons i {
      font-size: 1.5rem;
      margin-right: 15px;
      color: var(--warm-gold);
    }
    .copyright {
      border-top: 1px solid #333;
      padding-top: 25px;
      text-align: center;
      font-size: 0.9rem;
    }
    @media (max-width: 640px) {
      h2 { font-size: 1.8rem; }
      .hero { text-align: center; }
      .hero-btn-group { justify-content: center; }
    }