/* roulang page: index */
:root {
      --primary-black: #0B0E14;
      --accent-orange: #FF6A2C;
      --accent-cyan: #00E5A0;
      --text-warm: #F4F4F6;
      --text-muted: #A1A5B0;
      --card-bg: #161B22;
      --card-border: rgba(255, 106, 44, 0.15);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.4);
      --shadow-hover: 0 12px 28px rgba(0,0,0,0.6);
      --spacing-section: 100px;
      --spacing-element: 24px;
      --transition: 0.25s ease;
    }

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

    body {
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
      background-color: var(--primary-black);
      color: var(--text-warm);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }

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

    button, .button {
      font-family: inherit;
      cursor: pointer;
      border: none;
      outline: none;
      transition: all var(--transition);
    }

    input, textarea {
      font-family: inherit;
      outline: none;
      transition: all var(--transition);
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(11, 14, 20, 0.8);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid var(--accent-cyan);
      box-shadow: 0 4px 20px rgba(0,0,0,0.3);
      padding: 12px 0;
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: var(--text-warm);
      display: flex;
      align-items: center;
    }

    .logo span {
      color: var(--accent-orange);
    }

    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
      font-weight: 500;
      font-size: 0.95rem;
    }

    .nav-links a {
      color: var(--text-muted);
      position: relative;
      padding: 6px 0;
    }

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

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-orange);
      transition: width var(--transition);
    }

    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }

    .cta-btn {
      background: var(--accent-orange);
      color: #0B0E14;
      font-weight: 700;
      padding: 10px 24px;
      border-radius: 50px;
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: 0.3px;
      box-shadow: 0 0 15px rgba(255, 106, 44, 0.4);
      animation: pulse 2s infinite;
    }

    .cta-btn:hover {
      background: #ff7f4a;
      box-shadow: 0 0 25px rgba(255, 106, 44, 0.6);
      color: #0B0E14;
    }

    .badge-live {
      background: var(--accent-cyan);
      color: #0B0E14;
      font-size: 0.7rem;
      font-weight: 700;
      padding: 4px 12px;
      border-radius: 50px;
      margin-left: 6px;
      letter-spacing: 0.5px;
    }

    .mobile-toggle {
      display: none;
      font-size: 1.8rem;
      color: var(--text-warm);
      background: none;
    }

    /* Hero */
    #hero {
      padding-top: 130px;
      padding-bottom: 80px;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      min-height: 85vh;
      display: flex;
      align-items: center;
    }

    #hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 20% 30%, rgba(11,14,20,0.7) 0%, rgba(11,14,20,0.9) 90%);
    }

    .hero-grid {
      position: relative;
      z-index: 2;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .hero-content h1 {
      font-size: 3.2rem;
      font-weight: 800;
      line-height: 1.2;
      letter-spacing: -0.8px;
      margin-bottom: 20px;
      color: var(--text-warm);
      text-shadow: 0 4px 20px rgba(0,0,0,0.5);
    }

    .hero-content h1 span {
      border-bottom: 4px solid var(--accent-cyan);
    }

    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 36px;
      max-width: 480px;
    }

    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--accent-orange);
      color: #0B0E14;
      font-weight: 700;
      padding: 14px 36px;
      border-radius: 50px;
      font-size: 1rem;
      letter-spacing: 0.5px;
      box-shadow: 0 6px 20px rgba(255, 106, 44, 0.4);
    }

    .btn-primary:hover {
      background: #ff8a5c;
      box-shadow: 0 10px 28px rgba(255, 106, 44, 0.6);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent-orange);
      color: var(--accent-orange);
      font-weight: 700;
      padding: 14px 36px;
      border-radius: 50px;
      font-size: 1rem;
    }

    .btn-outline:hover {
      background: rgba(255, 106, 44, 0.1);
      border-color: #ff8a5c;
    }

    .hero-visual {
      position: relative;
    }

    .hero-visual img {
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.7);
      transform: perspective(800px) rotateY(-5deg);
      border: 2px solid rgba(255,106,44,0.3);
    }

    .live-ticker {
      margin-top: 40px;
      display: flex;
      gap: 30px;
      background: rgba(22,27,34,0.8);
      backdrop-filter: blur(12px);
      padding: 16px 28px;
      border-radius: 60px;
      border: 1px solid var(--accent-cyan);
      width: fit-content;
      color: var(--text-warm);
    }

    .ticker-item {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 600;
    }

    .ticker-dot {
      width: 10px;
      height: 10px;
      background: var(--accent-cyan);
      border-radius: 50%;
      animation: blink 1.2s infinite;
    }

    /* 通用板块 */
    section {
      padding: var(--spacing-section) 0;
    }

    .section-title {
      font-size: 2.4rem;
      font-weight: 700;
      margin-bottom: 18px;
      color: var(--text-warm);
    }

    .section-sub {
      color: var(--text-muted);
      margin-bottom: 48px;
      font-size: 1.1rem;
    }

    /* 核心优势 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 28px;
    }

    .adv-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 36px 28px;
      border: 1px solid transparent;
      box-shadow: var(--shadow-card);
      transition: all var(--transition);
      text-align: left;
    }

    .adv-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover);
      border-color: var(--accent-orange);
    }

    .adv-icon {
      font-size: 2.4rem;
      color: var(--accent-cyan);
      margin-bottom: 22px;
    }

    .adv-card h3 {
      font-size: 1.5rem;
      font-weight: 600;
      margin-bottom: 14px;
    }

    /* 热门项目 */
    .products-scroll {
      display: flex;
      gap: 28px;
      overflow-x: auto;
      padding-bottom: 16px;
      scroll-snap-type: x mandatory;
      -webkit-overflow-scrolling: touch;
    }

    .product-card {
      min-width: 260px;
      background: var(--card-bg);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      border: 1px solid transparent;
      transition: all var(--transition);
      scroll-snap-align: start;
    }

    .product-card:hover {
      transform: translateY(-6px);
      border-color: var(--accent-orange);
    }

    .product-img {
      height: 160px;
      object-fit: cover;
    }

    .product-info {
      padding: 22px;
    }

    .tag {
      background: var(--accent-orange);
      color: #0B0E14;
      font-weight: 700;
      font-size: 0.7rem;
      padding: 4px 12px;
      border-radius: 50px;
      display: inline-block;
      margin-bottom: 12px;
    }

    /* 流程 */
    .steps {
      display: flex;
      justify-content: space-between;
      text-align: center;
      position: relative;
    }

    .step {
      flex: 1;
      padding: 0 18px;
    }

    .step-num {
      width: 60px;
      height: 60px;
      background: var(--accent-orange);
      color: #0B0E14;
      font-weight: 800;
      font-size: 1.6rem;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 20px;
      box-shadow: 0 0 20px rgba(255,106,44,0.5);
    }

    /* 合作案例 */
    .cases-block {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .stats {
      display: flex;
      gap: 30px;
      margin-top: 30px;
    }

    .stat-number {
      font-size: 2.6rem;
      font-weight: 800;
      color: var(--accent-orange);
    }

    /* FAQ */
    .accordion-item {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      margin-bottom: 16px;
      border-left: 4px solid transparent;
      transition: all var(--transition);
    }

    .accordion-item.active {
      border-left-color: var(--accent-orange);
    }

    .accordion-header {
      padding: 22px 28px;
      font-weight: 700;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: var(--text-warm);
    }

    .accordion-content {
      padding: 0 28px 22px;
      color: var(--text-muted);
      display: none;
    }

    .accordion-item.active .accordion-content {
      display: block;
    }

    /* 联系 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 50px;
    }

    .contact-form input,
    .contact-form textarea {
      width: 100%;
      background: var(--card-bg);
      border: 1px solid #2A2F38;
      border-radius: var(--radius-input);
      padding: 14px;
      margin-bottom: 18px;
      color: var(--text-warm);
    }

    .contact-form input:focus,
    .contact-form textarea:focus {
      border-color: var(--accent-cyan);
      box-shadow: 0 0 12px rgba(0,229,160,0.3);
    }

    .footer {
      background: #0A0D12;
      padding: 60px 0 30px;
      border-top: 1px solid #1E2430;
      color: var(--text-muted);
    }

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

    @keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(255, 106, 44, 0.5); }
      70% { box-shadow: 0 0 0 12px rgba(255, 106, 44, 0); }
      100% { box-shadow: 0 0 0 0 rgba(255, 106, 44, 0); }
    }

    @keyframes blink {
      50% { opacity: 0.4; }
    }

    @media (max-width: 1024px) {
      .advantages-grid { grid-template-columns: repeat(2,1fr); }
      .hero-grid { grid-template-columns: 1fr; }
      .cases-block { grid-template-columns: 1fr; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-toggle { display: block; }
      .advantages-grid { grid-template-columns: 1fr; }
      .contact-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }