/* roulang page: index */
:root {
      --red: #E63946;
      --red-deep: #C1121F;
      --black: #1D1D1D;
      --deep-black: #0B0B0B;
      --silver: #F1F5F9;
      --white-track: #FAFAFA;
      --gray-light: #F3F4F6;
      --gray-mid: #9CA3AF;
      --gray-dark: #4B5563;
      --gray-text: #6B7280;
      --border-light: #E5E7EB;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-hero: 48px;
      --font-h1: 39px;
      --font-h2: 31.25px;
      --font-h3: 25px;
      --font-h4: 20px;
      --font-body: 16px;
      --transition: all 0.2s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: var(--white-track);
      color: var(--black);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航固定 */
    header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(8px);
      z-index: 50;
      border-bottom: 1px solid var(--border-light);
    }
    .nav-link {
      color: var(--black);
      font-weight: 500;
      transition: var(--transition);
      position: relative;
      padding-bottom: 4px;
      border-bottom: 2px solid transparent;
    }
    .nav-link:hover {
      color: var(--red);
      border-bottom-color: var(--red);
    }
    .nav-link.active {
      color: var(--red);
      border-bottom: 2px solid var(--red);
    }
    /* 汉堡菜单 */
    #menu-toggle:checked ~ #mobile-menu {
      display: flex;
    }
    .hamburger-line {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--black);
      margin: 5px 0;
      transition: 0.3s;
    }
    #menu-toggle:checked + .hamburger-icon .hamburger-line:nth-child(1) {
      transform: rotate(45deg) translate(5px, 5px);
    }
    #menu-toggle:checked + .hamburger-icon .hamburger-line:nth-child(2) {
      opacity: 0;
    }
    #menu-toggle:checked + .hamburger-icon .hamburger-line:nth-child(3) {
      transform: rotate(-45deg) translate(5px, -5px);
    }
    /* 按钮 */
    .btn-primary {
      background: var(--red);
      color: white;
      font-weight: 700;
      padding: 16px 40px;
      border-radius: var(--radius-btn);
      transition: var(--transition);
      display: inline-block;
      text-align: center;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background: var(--red-deep);
      box-shadow: var(--shadow-hover);
    }
    .btn-outline {
      background: transparent;
      color: white;
      font-weight: 700;
      padding: 14px 38px;
      border-radius: var(--radius-btn);
      border: 2px solid white;
      transition: var(--transition);
      display: inline-block;
      text-align: center;
    }
    .btn-outline:hover {
      background: white;
      color: var(--deep-black);
    }
    .btn-white {
      background: white;
      color: var(--red);
      font-weight: 700;
      padding: 18px 48px;
      border-radius: var(--radius-btn);
      transition: var(--transition);
      display: inline-block;
      border: none;
      cursor: pointer;
    }
    .btn-white:hover {
      background: #F1F5F9;
      box-shadow: 0 10px 25px rgba(0,0,0,0.15);
    }
    /* 卡片通用 */
    .card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      border: 1px solid var(--gray-light);
    }
    .card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
      border-color: var(--red);
    }
    /* 痛点竖线卡片 */
    .pain-card {
      background: transparent;
      padding: 0 0 0 20px;
      border-left: 4px solid var(--red);
    }
    /* 数据指标 */
    .data-number {
      font-size: 48px;
      font-weight: 800;
      color: var(--red);
      line-height: 1.2;
    }
    /* 证言引号 */
    .testimonial-quote {
      position: absolute;
      top: -20px;
      left: 20px;
      font-size: 72px;
      color: var(--red);
      opacity: 0.1;
      font-family: serif;
      line-height: 1;
    }
    /* 页脚细线 */
    .footer-divider {
      border-top: 1px solid #374151;
    }
    /* 移动端调整 */
    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
      .hero-title {
        font-size: 32px;
      }
      .data-number {
        font-size: 36px;
      }
    }