/* roulang page: index */
/* ----- 设计变量与全局重置 ----- */
    :root {
      --primary-dark: #1E1E1E; /* 沥青黑 */
      --primary-brown: #4E342E; /* 暖橡木深棕 */
      --accent-gold: #D4AF37;   /* 帝王金 */
      --accent-orange: #FF5722; /* 警示橙 */
      --accent-orange-hover: #E64A19;
      --gray-concrete: #9E9E9E;
      --gray-light: #F5F5F5;
      --white: #FFFFFF;
      --text-dark: #333333;
      --text-light: #CCCCCC;
      --border-light: #E0E0E0;
      
      --font-heading: 'PingFang SC', '阿里巴巴普惠体', 'Microsoft YaHei', sans-serif;
      --font-number: 'Oswald', 'Bebas Neue', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      
      --shadow-hard: 4px 4px 0px rgba(0,0,0,0.08);
      --transition-default: 0.2s ease-in-out;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    html {
      scroll-behavior: smooth;
    }
    
    body {
      font-family: var(--font-body);
      line-height: 1.6;
      color: var(--text-dark);
      background-color: var(--white);
      -webkit-font-smoothing: antialiased;
    }
    
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-default);
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    ul {
      list-style: none;
    }
    
    /* 按钮基础 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 32px;
      font-weight: 600;
      border-radius: 4px;
      font-size: 1rem;
      cursor: pointer;
      transition: all var(--transition-default);
      border: none;
      letter-spacing: 0.5px;
      text-transform: uppercase;
      font-family: var(--font-heading);
    }
    
    .btn-primary {
      background-color: var(--accent-orange);
      color: var(--white);
      box-shadow: 0 2px 8px rgba(255, 87, 34, 0.3);
    }
    
    .btn-primary:hover {
      background-color: var(--accent-orange-hover);
      transform: translateX(2px);
      box-shadow: 0 6px 16px rgba(230, 74, 25, 0.4);
    }
    
    .btn-ghost {
      background: transparent;
      border: 2px solid var(--accent-gold);
      color: var(--accent-gold);
    }
    
    .btn-ghost:hover {
      background-color: rgba(212, 175, 55, 0.1);
      border-color: var(--accent-orange);
      color: var(--accent-orange);
    }
    
    .btn-white-ghost {
      background: transparent;
      border: 2px solid var(--white);
      color: var(--white);
    }
    .btn-white-ghost:hover {
      background-color: rgba(255,255,255,0.15);
    }

    /* ----- 顶部信息条 ----- */
    .top-bar {
      background-color: var(--primary-dark);
      color: var(--gray-concrete);
      font-size: 0.85rem;
      padding: 8px 0;
      height: 36px;
      display: flex;
      align-items: center;
    }
    .top-bar .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .top-bar a {
      color: var(--accent-orange);
      font-weight: 600;
      margin-left: 12px;
    }
    
    /* ----- 主导航 ----- */
    .main-header {
      background: var(--white);
      border-bottom: 1px solid var(--border-light);
      position: sticky;
      top: 0;
      z-index: 50;
      padding: 16px 0;
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .logo {
      font-family: var(--font-heading);
      font-weight: 800;
      font-size: 1.8rem;
      color: var(--primary-dark);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo i {
      color: var(--accent-orange);
      font-size: 2rem;
    }
    .nav-menu {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-menu a {
      font-weight: 600;
      color: var(--primary-brown);
      font-size: 1rem;
      border-bottom: 2px solid transparent;
      padding-bottom: 4px;
    }
    .nav-menu a:hover,
    .nav-menu a.active {
      border-bottom-color: var(--accent-orange);
      color: var(--accent-orange);
    }
    .hamburger {
      display: none;
      font-size: 1.8rem;
      cursor: pointer;
      color: var(--primary-dark);
    }
    
    /* ----- Hero 首屏 ----- */
    .hero {
      background: linear-gradient(135deg, #1E1E1E 0%, #2A2A2A 100%);
      color: var(--white);
      padding: 100px 0 120px;
      position: relative;
      overflow: hidden;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
    }
    .hero::before {
      content: "";
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: radial-gradient(circle at 20% 30%, rgba(212,175,55,0.08) 0%, transparent 50%);
      pointer-events: none;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
      position: relative;
      z-index: 2;
    }
    .hero-content {
      flex: 1;
    }
    .hero h1 {
      font-family: var(--font-heading);
      font-weight: 900;
      font-size: 3.8rem;
      line-height: 1.2;
      letter-spacing: -0.5px;
      transform: skewX(-2deg);
      margin-bottom: 24px;
      color: var(--white);
      text-shadow: 2px 2px 0 rgba(0,0,0,0.3);
    }
    .hero h1 span {
      color: var(--accent-orange);
    }
    .hero-sub {
      font-size: 1.25rem;
      color: var(--text-light);
      margin-bottom: 32px;
      max-width: 500px;
    }
    .hero-cta-card {
      background: rgba(255,255,255,0.1);
      backdrop-filter: blur(8px);
      padding: 32px;
      border-radius: 6px;
      border-left: 4px solid var(--accent-orange);
    }
    
    /* 板块通用 */
    .section {
      padding: 90px 0;
    }
    .section-dark {
      background-color: var(--primary-dark);
      color: var(--white);
    }
    .section-light {
      background-color: var(--gray-light);
    }
    .section-title {
      font-family: var(--font-heading);
      font-weight: 800;
      font-size: 2.4rem;
      margin-bottom: 16px;
      color: var(--primary-dark);
      letter-spacing: -0.5px;
    }
    .section-dark .section-title {
      color: var(--white);
    }
    .section-sub {
      color: var(--gray-concrete);
      margin-bottom: 48px;
      font-size: 1.1rem;
    }
    
    /* 痛点卡片 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .pain-card {
      background: var(--white);
      padding: 32px 24px;
      border-left: 5px solid var(--accent-orange);
      box-shadow: var(--shadow-hard);
      transition: transform 0.2s;
    }
    .pain-card:hover {
      transform: translateY(-5px);
    }
    .pain-icon {
      font-size: 2.2rem;
      color: var(--accent-orange);
      margin-bottom: 16px;
    }
    
    /* 解决方案交替块 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .solution-row.reverse {
      flex-direction: row-reverse;
    }
    .solution-img {
      flex: 1;
      border-radius: 4px;
      overflow: hidden;
      box-shadow: 6px 6px 0 rgba(0,0,0,0.1);
    }
    .solution-text {
      flex: 1;
    }
    
    /* 数据区 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      text-align: center;
      gap: 40px;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 4rem;
      color: var(--accent-gold);
      line-height: 1;
    }
    
    /* 证言卡片 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .testimonial-card {
      background: var(--white);
      padding: 28px;
      border-radius: 2px;
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
    }
    .testimonial-avatar {
      width: 60px;
      height: 60px;
      border-radius: 50%;
      background: var(--gray-light);
      margin-bottom: 16px;
      overflow: hidden;
    }
    
    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 700;
      font-size: 1.2rem;
      display: flex;
      align-items: center;
      gap: 12px;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: #555;
      margin-top: 8px;
      padding-left: 32px;
    }
    
    /* 页脚 */
    .footer {
      background: #1A1A1A;
      color: #AAAAAA;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    
    /* 响应式 */
    @media (max-width: 1024px) {
      .container { padding: 0 24px; }
      .hero h1 { font-size: 2.8rem; }
    }
    @media (max-width: 768px) {
      .hamburger { display: block; }
      .nav-menu {
        display: none;
        position: absolute;
        top: 70px; left: 0; right: 0;
        background: white;
        flex-direction: column;
        padding: 24px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
      }
      .nav-menu.active { display: flex; }
      .hero-grid { flex-direction: column; }
      .cards-grid, .testimonial-grid, .stats-grid { grid-template-columns: 1fr; }
      .solution-row, .solution-row.reverse { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }