/* roulang page: index */
:root {
      --primary: #FF3300;
      --primary-hover: #CC2900;
      --secondary-gold: #FFD700;
      --dark-base: #1A1A1A;
      --dark-card: #222222;
      --dark-light: #2A2A2A;
      --warm-white: #F5F5F0;
      --text-light: #FFFFFF;
      --text-muted-light: #B3B3B3;
      --text-dark: #1A1A1A;
      --text-muted-dark: #666666;
      --border-radius-sm: 4px;
      --shadow-hard: 4px 4px 0px rgba(255, 51, 0, 0.3);
      --font-heading: 'Oswald', 'PingFang SC Heavy', 'Impact', sans-serif;
      --font-body: 'Noto Sans SC', 'PingFang SC Regular', sans-serif;
      --container-max: 1280px;
      --nav-height: 64px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      scroll-padding-top: var(--nav-height);
    }
    body {
      font-family: var(--font-body);
      background-color: var(--dark-base);
      color: var(--text-light);
      line-height: 1.7;
      font-weight: 400;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button, .btn {
      font-family: var(--font-heading);
      font-weight: 600;
      letter-spacing: 1px;
      cursor: pointer;
      border: none;
      background: none;
      display: inline-block;
      transition: all 0.25s ease;
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(26, 26, 26, 0.95);
      backdrop-filter: blur(12px);
      z-index: 1000;
      display: flex;
      align-items: center;
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 24px;
      color: var(--text-light);
      letter-spacing: 2px;
    }
    .logo i {
      color: var(--primary);
      font-size: 28px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      color: var(--text-light);
      font-weight: 500;
      font-size: 15px;
      letter-spacing: 0.8px;
      position: relative;
      padding: 8px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 2px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-nav {
      background: var(--primary);
      color: white;
      padding: 10px 24px;
      border-radius: var(--border-radius-sm);
      font-weight: 700;
    }
    .btn-nav:hover {
      background: var(--primary-hover);
      box-shadow: 0 0 12px rgba(255,51,0,0.7);
    }
    .hamburger {
      display: none;
      font-size: 24px;
      background: none;
      border: none;
      color: white;
      cursor: pointer;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(26,26,26,0.98);
      backdrop-filter: blur(20px);
      z-index: 999;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
    }
    .mobile-menu.active {
      display: flex;
    }
    .mobile-menu a {
      font-size: 22px;
      font-family: var(--font-heading);
      color: white;
    }
    .close-menu {
      position: absolute;
      top: 20px;
      right: 24px;
      font-size: 32px;
      background: none;
      border: none;
      color: white;
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 20% 30%, rgba(255,51,0,0.15) 0%, transparent 60%), 
                  url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      background-color: #0f0f0f;
      position: relative;
      margin-top: 0;
    }
    .hero-content {
      display: flex;
      align-items: center;
      gap: 40px;
      flex-wrap: wrap;
      width: 100%;
    }
    .hero-text {
      flex: 1 1 500px;
    }
    .hero-text h1 {
      font-family: var(--font-heading);
      font-size: clamp(42px, 7vw, 72px);
      font-weight: 800;
      line-height: 1.1;
      color: white;
      text-transform: uppercase;
      margin-bottom: 20px;
    }
    .hero-text h1 span {
      color: var(--primary);
    }
    .hero-text p {
      font-size: 18px;
      color: var(--text-muted-light);
      margin-bottom: 32px;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 16px 36px;
      border-radius: 2px;
      font-weight: 700;
      letter-spacing: 1.5px;
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      box-shadow: 0 0 18px rgba(255,51,0,0.8);
    }
    .btn-secondary {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 16px 36px;
      border-radius: 2px;
    }
    .btn-secondary:hover {
      background: var(--primary);
      color: white;
    }
    .hero-image {
      flex: 1 1 400px;
      display: flex;
      justify-content: center;
    }
    .hero-image img {
      max-height: 500px;
      object-fit: contain;
      filter: drop-shadow(8px 8px 0 rgba(255,51,0,0.2));
    }
    /* 通用区块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-family: var(--font-heading);
      font-size: clamp(32px, 5vw, 48px);
      font-weight: 700;
      margin-bottom: 16px;
      color: white;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      position: absolute;
      bottom: -8px;
      left: 0;
      width: 60%;
      height: 4px;
      background: var(--primary);
    }
    .section-sub {
      color: var(--text-muted-light);
      margin-bottom: 48px;
      font-size: 16px;
    }
    /* 核心优势 非对称网格 */
    .features-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 28px;
      margin-top: 40px;
    }
    .feature-card {
      background: #1e1e1e;
      padding: 32px;
      border-left: 4px solid var(--primary);
      box-shadow: var(--shadow-hard);
      transition: 0.2s;
    }
    .feature-card:hover {
      box-shadow: 6px 6px 0 var(--primary);
      border-left-width: 6px;
    }
    .feature-card i {
      font-size: 36px;
      color: var(--primary);
      margin-bottom: 16px;
    }
    .feature-card h3 {
      font-family: var(--font-heading);
      font-size: 22px;
      margin-bottom: 10px;
    }
    .feature-card p {
      color: var(--text-muted-light);
    }
    /* 产品卡片 */
    .product-row {
      display: flex;
      flex-direction: column;
      gap: 40px;
    }
    .product-item {
      display: flex;
      background: #1e1e1e;
      border-radius: var(--border-radius-sm);
      overflow: hidden;
      box-shadow: 4px 4px 0 rgba(255,51,0,0.15);
    }
    .product-img {
      flex: 0 0 40%;
      background: #2a2a2a;
      display: flex;
      align-items: center;
      justify-content: center;
      clip-path: polygon(0 0, 100% 0, 90% 100%, 0% 100%);
    }
    .product-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .product-info {
      flex: 1;
      padding: 32px;
    }
    .product-info h3 {
      font-family: var(--font-heading);
      font-size: 28px;
      margin-bottom: 12px;
    }
    .product-info ul {
      list-style: none;
    }
    .product-info li {
      margin-bottom: 8px;
      display: flex;
      align-items: center;
      gap: 8px;
      color: #ccc;
    }
    .product-info li i {
      color: var(--primary);
    }
    /* 流程 */
    .steps {
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      background: #111;
      padding: 40px;
      border-radius: 4px;
    }
    .step {
      flex: 1 1 180px;
      text-align: center;
      color: white;
    }
    .step-num {
      font-family: var(--font-heading);
      font-size: 48px;
      color: var(--primary);
      font-weight: 700;
    }
    /* 数据 */
    .stats {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 24px;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-heading);
      font-size: 56px;
      color: var(--secondary-gold);
      font-weight: 700;
    }
    /* 证言 */
    .testimonials {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
    }
    .testimonial-card {
      background: var(--warm-white);
      color: var(--text-dark);
      padding: 28px;
      flex: 1 1 280px;
      border-radius: 4px;
      position: relative;
      box-shadow: 4px 4px 0 rgba(0,0,0,0.1);
    }
    .testimonial-card::before {
      content: "“";
      font-size: 60px;
      color: var(--primary);
      position: absolute;
      top: 10px;
      left: 15px;
      opacity: 0.5;
      font-family: serif;
    }
    .user-info {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 16px;
    }
    .avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #ccc;
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid #333;
      margin-bottom: 8px;
    }
    .faq-question {
      background: none;
      border: none;
      color: white;
      font-size: 18px;
      font-weight: 600;
      width: 100%;
      text-align: left;
      padding: 18px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s;
      background: #2a2a2a;
      padding: 0 16px;
      color: #ccc;
    }
    .faq-answer.open {
      max-height: 200px;
      padding: 16px;
    }
    /* CTA */
    .cta-section {
      background: var(--primary);
      text-align: center;
      padding: 80px 24px;
    }
    .cta-section h2 {
      font-size: 42px;
      color: white;
    }
    .btn-cta {
      background: white;
      color: var(--primary);
      padding: 18px 48px;
      font-size: 20px;
      margin-top: 24px;
      border-radius: 2px;
    }
    .btn-cta:hover {
      background: #111;
      color: white;
    }
    footer {
      background: #111;
      padding: 48px 0 20px;
      border-top: 2px solid var(--primary);
    }
    .footer-grid {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 32px;
    }
    @media (max-width: 992px) {
      .features-grid { grid-template-columns: 1fr; }
      .product-item { flex-direction: column; }
      .product-img { clip-path: none; flex: auto; height: 240px; }
      .nav-links { display: none; }
      .hamburger { display: block; }
    }
    @media (max-width: 768px) {
      .hero-content { flex-direction: column; text-align: center; }
      .hero-text p { margin: 0 auto 24px; }
      .hero-buttons { justify-content: center; }
    }