/* roulang page: index */
:root {
      --color-deep-moss: #1A3636;
      --color-smoky-green: #2F4F4F;
      --color-warm-gold: #C5A059;
      --color-gold-hover: #D9B46D;
      --bg-warm-gray: #F8F9FA;
      --bg-cream: #F5F2EB;
      --card-bg: #FFFFFF;
      --text-body: #4A5568;
      --text-muted: #718096;
      --text-light: #ICON-like light;
      --border-light: rgba(26,54,54,0.08);
      --shadow-card: 0 4px 12px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 12px 24px rgba(0,0,0,0.08);
      --radius-md: 8px;
      --radius-sm: 4px;
      --transition-base: 0.3s ease;
      --max-width: 1200px;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    html {
      scroll-behavior: smooth;
    }
    
    body {
      font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      font-weight: 400;
      line-height: 1.6;
      color: var(--text-body);
      background-color: var(--bg-warm-gray);
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }
    
    h1, h2, h3, h4 {
      font-weight: 700;
      line-height: 1.3;
      color: var(--color-deep-moss);
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition-base);
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    .container {
      max-width: var(--max-width);
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    
    /* 导航栏 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: rgba(248, 249, 250, 0.8);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(26,54,54,0.06);
      transition: background var(--transition-base), box-shadow var(--transition-base);
    }
    
    .header.scrolled {
      background: rgba(255, 255, 255, 0.95);
      box-shadow: 0 2px 12px rgba(0,0,0,0.05);
      border-bottom-color: transparent;
    }
    
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--color-deep-moss);
      letter-spacing: -0.5px;
    }
    
    .logo-icon {
      font-size: 1.8rem;
      color: var(--color-warm-gold);
    }
    
    .nav-links {
      display: flex;
      align-items: center;
      gap: 34px;
      list-style: none;
    }
    
    .nav-links a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--color-deep-moss);
      position: relative;
      padding: 6px 0;
    }
    
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background-color: var(--color-warm-gold);
      transition: width var(--transition-base);
    }
    
    .nav-links a:hover::after,
    .nav-links a:focus-visible::after {
      width: 100%;
    }
    
    .mobile-menu-btn {
      display: none;
      background: none;
      border: 1px solid var(--color-deep-moss);
      font-size: 1.4rem;
      color: var(--color-deep-moss);
      cursor: pointer;
      padding: 6px 10px;
      border-radius: var(--radius-sm);
    }
    
    /* Hero区域 */
    .hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      background: linear-gradient(150deg, #1A3636 0%, #0F2020 100%);
      position: relative;
      overflow: hidden;
      margin-top: 72px;
      padding: 60px 0;
    }
    
    .hero::before {
      content: "";
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.35;
      mix-blend-mode: soft-light;
      pointer-events: none;
    }
    
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
      color: white;
    }
    
    .hero h1 {
      font-size: clamp(2.5rem, 8vw, 3.8rem);
      font-weight: 700;
      color: #FFFFFF;
      letter-spacing: -1px;
      margin-bottom: 20px;
      line-height: 1.15;
    }
    
    .hero h1 span {
      color: var(--color-warm-gold);
      font-family: 'Oswald', 'Impact', sans-serif;
      font-weight: 700;
    }
    
    .hero-sub {
      font-size: 1.1rem;
      line-height: 1.6;
      margin-bottom: 36px;
      color: rgba(255,255,255,0.75);
      max-width: 560px;
    }
    
    .btn-group {
      display: flex;
      flex-wrap: wrap;
      gap: 20px;
    }
    
    .btn-primary {
      background: var(--color-warm-gold);
      color: var(--color-deep-moss);
      border: 1px solid var(--color-warm-gold);
      padding: 14px 34px;
      border-radius: 50px;
      font-weight: 600;
      font-size: 1rem;
      transition: background var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base);
      display: inline-block;
      cursor: pointer;
      text-align: center;
      letter-spacing: 0.3px;
    }
    
    .btn-primary:hover {
      background: var(--color-gold-hover);
      border-color: var(--color-gold-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(197,160,89,0.3);
    }
    
    .btn-outline {
      background: transparent;
      color: white;
      border: 1px solid rgba(255,255,255,0.7);
      padding: 14px 34px;
      border-radius: 50px;
      font-weight: 500;
      font-size: 1rem;
      transition: all var(--transition-base);
      cursor: pointer;
    }
    
    .btn-outline:hover {
      background: white;
      color: var(--color-deep-moss);
      border-color: white;
      transform: translateY(-2px);
    }
    
    /* 通用板块样式 */
    section {
      padding: 90px 0;
    }
    
    .section-title {
      text-align: center;
      margin-bottom: 60px;
    }
    
    .section-title h2 {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--color-deep-moss);
      margin-bottom: 14px;
      letter-spacing: -0.5px;
    }
    
    .section-title p {
      color: var(--text-muted);
      max-width: 600px;
      margin: 0 auto;
      font-size: 1rem;
    }
    
    /* 优势卡片（非对称网格） */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
      gap: 30px;
    }
    
    .feature-item {
      background: var(--card-bg);
      padding: 28px 24px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      transition: all var(--transition-base);
      display: flex;
      flex-direction: column;
      border-left: 4px solid transparent;
    }
    
    .feature-item:nth-child(odd) {
      border-left-color: var(--color-warm-gold);
    }
    
    .feature-item:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-4px);
    }
    
    .feature-icon {
      font-size: 2rem;
      color: var(--color-warm-gold);
      margin-bottom: 18px;
    }
    
    .feature-item h3 {
      font-size: 1.25rem;
      margin-bottom: 10px;
    }
    
    /* 数据板块 */
    .stats-container {
      display: flex;
      justify-content: center;
      flex-wrap: wrap;
      gap: 45px;
      background: rgba(26,54,54,0.03);
      border-radius: var(--radius-md);
      padding: 50px 30px;
    }
    
    .stat-item {
      text-align: center;
    }
    
    .stat-number {
      font-family: 'Oswald', 'Impact', sans-serif;
      font-size: 3rem;
      font-weight: 700;
      color: var(--color-warm-gold);
      line-height: 1.1;
    }
    
    .stat-label {
      color: var(--text-muted);
      font-weight: 500;
      margin-top: 8px;
    }
    
    /* 案例卡片 */
    .cases-row {
      display: flex;
      gap: 28px;
      overflow-x: auto;
      padding-bottom: 10px;
      scroll-snap-type: x mandatory;
    }
    
    .case-card {
      flex: 0 0 calc(50% - 14px);
      min-width: 300px;
      background: var(--card-bg);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      display: flex;
      flex-direction: column;
      scroll-snap-align: start;
      transition: all var(--transition-base);
    }
    
    .case-card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-4px);
    }
    
    .case-img {
      height: 180px;
      background-size: cover;
      background-position: center;
      border-radius: var(--radius-md) var(--radius-md) 0 0;
    }
    
    .case-text {
      padding: 22px;
    }
    
    /* 解决方案步骤 */
    .steps-flow {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 35px;
    }
    
    .step {
      flex: 1 1 200px;
      text-align: center;
      max-width: 250px;
    }
    
    .step-icon {
      font-size: 2.2rem;
      color: var(--color-warm-gold);
      margin-bottom: 16px;
    }
    
    /* FAQ */
    .faq-list {
      max-width: 780px;
      margin: 0 auto;
    }
    
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 16px 0;
    }
    
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      cursor: pointer;
      color: var(--color-deep-moss);
    }
    
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-body);
      padding-right: 20px;
    }
    
    /* CTA 区块 */
    .cta-section {
      background: linear-gradient(120deg, #1A3636, #132525);
      color: white;
    }
    
    .form-line {
      background: transparent;
      border: none;
      border-bottom: 2px solid rgba(255,255,255,0.4);
      padding: 12px 0;
      margin-bottom: 25px;
      color: white;
      width: 100%;
      transition: border-color 0.2s;
    }
    
    .form-line:focus {
      outline: none;
      border-bottom-color: var(--color-warm-gold);
    }
    
    ::placeholder {
      color: #A0AEC0;
    }
    
    .footer {
      background: #0F2020;
      color: #A0AEC0;
      padding: 35px 0;
      font-size: 0.9rem;
    }
    
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 35px;
        gap: 26px;
        box-shadow: 0 12px 24px rgba(0,0,0,0.08);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
      .cases-row {
        flex-direction: column;
      }
    }