/* roulang page: index */
:root {
      --primary: #0A6EFF;
      --primary-dark: #0056D6;
      --secondary: #0B0E14;
      --accent-neon: #00F0B5;
      --accent-purple: #7B2FFF;
      --surface-white: #FFFFFF;
      --surface-light: #F5F8FC;
      --text-primary: #1E293B;
      --text-secondary: #64748B;
      --text-on-dark: #B0B8C1;
      --border-light: #E2E8F0;
      --shadow-card: 0 4px 24px rgba(0,0,0,0.06);
      --shadow-card-hover: 0 12px 32px rgba(10,110,255,0.12);
      --radius-sm: 8px;
      --radius-md: 16px;
      --radius-lg: 24px;
      --transition: 0.3s cubic-bezier(0.2, 0.0, 0, 1.0);
      --container-max: 1280px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Helvetica Neue", Arial, sans-serif;
      --font-numeric: "Oswald", "DIN Alternate", "Bebas Neue", sans-serif;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--surface-white);
      color: var(--text-primary);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }
    
    h1, h2, h3 {
      font-weight: 700;
      line-height: 1.3;
    }
    
    /* Header & Navigation */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      transition: background 0.3s, box-shadow 0.3s, backdrop-filter 0.3s;
      background: transparent;
      backdrop-filter: blur(0px);
    }
    
    .main-header.scrolled {
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(16px);
      box-shadow: 0 10px 25px -5px rgba(0,0,0,0.08);
    }
    
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }
    
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: white;
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      transition: color 0.3s;
    }
    .main-header.scrolled .logo {
      color: var(--secondary);
    }
    .logo span {
      color: var(--accent-neon);
      margin-right: 6px;
      font-size: 28px;
      line-height: 1;
    }
    
    .nav-links {
      display: flex;
      align-items: center;
      gap: 36px;
      list-style: none;
    }
    
    .nav-links a {
      font-weight: 500;
      color: rgba(255,255,255,0.85);
      font-size: 15px;
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }
    .main-header.scrolled .nav-links a {
      color: var(--text-primary);
    }
    .nav-links a:hover {
      color: white;
    }
    .main-header.scrolled .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -4px;
      width: 0;
      height: 3px;
      background: var(--accent-neon);
      transition: width 0.25s ease;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    
    .btn-primary {
      background: var(--primary);
      color: white !important;
      font-weight: 600;
      border: none;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 15px;
      transition: background 0.2s, transform 0.15s, box-shadow 0.2s;
      box-shadow: 0 4px 12px rgba(10,110,255,0.3);
      white-space: nowrap;
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: scale(1.03);
      box-shadow: 0 8px 20px rgba(10,110,255,0.45);
    }
    
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      transition: 0.25s;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    
    /* Hamburger */
    .hamburger {
      display: none;
      flex-direction: column;
      justify-content: space-between;
      width: 24px;
      height: 18px;
      cursor: pointer;
      background: transparent;
      border: none;
    }
    .hamburger span {
      display: block;
      height: 2px;
      background: white;
      transition: 0.3s;
      width: 100%;
    }
    .main-header.scrolled .hamburger span {
      background: var(--secondary);
    }
    
    /* Mobile drawer */
    .mobile-drawer {
      position: fixed;
      top: 0;
      right: 0;
      width: 280px;
      height: 100vh;
      background: var(--secondary);
      z-index: 999;
      transform: translateX(100%);
      transition: transform 0.35s ease;
      padding: 28px;
      display: none;
      flex-direction: column;
      gap: 28px;
    }
    .mobile-drawer.open {
      transform: translateX(0);
    }
    .mobile-drawer a {
      color: white;
      font-size: 18px;
      font-weight: 500;
    }
    
    /* Hero */
    .hero {
      min-height: 100vh;
      background: linear-gradient(135deg, #070a12 0%, #0a1a3a 100%);
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }
    .hero::before {
      content: '';
      position: absolute;
      top: 0; left: 0; width: 100%; height: 100%;
      background: radial-gradient(circle at 80% 30%, rgba(0,240,181,0.1) 0%, transparent 50%);
    }
    .hero-content {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
      width: 100%;
    }
    .hero-text h1 {
      font-size: 58px;
      font-weight: 700;
      color: white;
      line-height: 1.2;
      margin-bottom: 24px;
      text-shadow: 0 4px 20px rgba(0,0,0,0.4);
    }
    .hero-text .subtitle {
      font-size: 18px;
      color: rgba(255,255,255,0.7);
      margin-bottom: 36px;
      max-width: 460px;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .hero-image {
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: 0 25px 50px rgba(0,0,0,0.5);
    }
    .hero-image img {
      width: 100%;
      object-fit: cover;
    }
    
    /* Sections */
    section {
      padding: 120px 0;
    }
    .section-header {
      text-align: center;
      margin-bottom: 64px;
    }
    .section-header h2 {
      font-size: 40px;
      font-weight: 700;
      color: var(--secondary);
      margin-bottom: 12px;
    }
    
    /* Stats Grid */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 28px;
    }
    .stat-card {
      background: var(--surface-light);
      border-radius: var(--radius-md);
      padding: 36px 24px;
      text-align: center;
      transition: var(--transition);
      box-shadow: var(--shadow-card);
    }
    .stat-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-card-hover);
    }
    .stat-number {
      font-family: var(--font-numeric);
      font-size: 52px;
      color: var(--accent-purple);
      font-weight: 700;
    }
    
    /* Services Grid */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 32px;
    }
    .service-card {
      background: white;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      overflow: hidden;
      transition: var(--transition);
    }
    .service-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-card-hover);
    }
    .service-card img {
      height: 200px;
      object-fit: cover;
      width: 100%;
    }
    .service-body {
      padding: 28px;
    }
    
    /* Timeline */
    .timeline {
      position: relative;
      padding-left: 28px;
    }
    .timeline-item {
      display: flex;
      gap: 32px;
      margin-bottom: 36px;
      position: relative;
    }
    .year-badge {
      font-family: var(--font-numeric);
      font-size: 28px;
      color: var(--accent-purple);
      min-width: 90px;
    }
    
    /* Brands */
    .brands-wall {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 30px;
    }
    .brand-item {
      filter: grayscale(100%) opacity(0.6);
      transition: 0.3s;
      font-weight: 700;
      color: var(--text-secondary);
      font-size: 22px;
    }
    .brand-item:hover {
      filter: none;
      opacity: 1;
      color: var(--primary);
    }
    
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-radius: 12px;
      margin-bottom: 12px;
      background: var(--surface-light);
      transition: 0.2s;
    }
    .faq-question {
      padding: 20px 28px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      padding: 0 28px;
    }
    .faq-item.active .faq-answer {
      max-height: 160px;
      padding-bottom: 20px;
    }
    
    /* CTA Banner */
    .cta-banner {
      background: var(--secondary);
      color: white;
      padding: 100px 0;
      text-align: center;
      position: relative;
    }
    
    footer {
      background: #0a0d13;
      color: var(--text-on-dark);
      padding: 70px 0 30px;
    }
    
    @media (max-width: 992px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .mobile-drawer { display: flex; }
      .hero-content { grid-template-columns: 1fr; }
    }
    
    @media (max-width: 768px) {
      .stats-grid, .services-grid { grid-template-columns: 1fr; }
    }