/* roulang page: index */
:root {
      --primary-red: #C8102E;
      --primary-red-hover: #A00D24;
      --deep-black: #1A1A1A;
      --champion-gold: #D4A843;
      --warm-bg: #FAF9F7;
      --card-white: #FFFFFF;
      --text-main: #1A1A1A;
      --text-secondary: #4A4A4A;
      --text-light: #6B6B6B;
      --border-light: #E5E3DF;
      --success-green: #2E7D32;
      --alert-orange: #F57C00;

      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 8px 30px rgba(0,0,0,0.08);
      --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-number: 'Inter', 'SF Pro Text', sans-serif;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--warm-bg);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
    }

    /* 导航 */
    #header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(255,255,255,0.88);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      z-index: 50;
      transition: background 0.3s ease, box-shadow 0.3s ease;
    }
    .header-scrolled {
      background: rgba(255,255,255,0.98);
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo-text {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary-red);
      letter-spacing: -0.3px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo-diamond {
      display: inline-block;
      width: 8px;
      height: 8px;
      background: var(--champion-gold);
      transform: rotate(45deg);
      margin-left: 2px;
    }
    .desktop-nav {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-secondary);
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }
    .nav-link:hover,
    .nav-link.active {
      color: var(--primary-red);
    }
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary-red);
      border-radius: 2px;
    }
    .btn-download-sm {
      background: var(--primary-red);
      color: white;
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 14px;
      transition: background 0.2s, box-shadow 0.2s;
      border: none;
    }
    .btn-download-sm:hover {
      background: var(--primary-red-hover);
      box-shadow: 0 4px 14px rgba(200,16,46,0.3);
    }

    /* 汉堡菜单 */
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 8px;
    }
    .hamburger span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--deep-black);
      border-radius: 2px;
      transition: all 0.3s;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: var(--warm-bg);
      backdrop-filter: blur(20px);
      padding: 32px 20px;
      flex-direction: column;
      gap: 24px;
      border-bottom: 1px solid var(--border-light);
      z-index: 49;
      transform: translateY(-10px);
      opacity: 0;
      transition: opacity 0.3s, transform 0.3s;
    }
    .mobile-menu.open {
      display: flex;
      transform: translateY(0);
      opacity: 1;
    }
    .mobile-nav-link {
      font-size: 20px;
      font-weight: 600;
      color: var(--deep-black);
      padding: 8px 0;
      border-bottom: 1px solid var(--border-light);
    }

    /* 按钮体系 */
    .btn-primary {
      background: var(--primary-red);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: background 0.2s, box-shadow 0.2s, transform 0.2s;
      border: none;
    }
    .btn-primary:hover {
      background: var(--primary-red-hover);
      box-shadow: 0 4px 16px rgba(200,16,46,0.3);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      color: var(--primary-red);
      border: 2px solid var(--primary-red);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      transition: background 0.2s, transform 0.2s;
    }
    .btn-outline:hover {
      background: rgba(200,16,46,0.06);
      transform: translateY(-1px);
    }
    .text-link {
      color: var(--primary-red);
      font-weight: 500;
      display: inline-flex;
      align-items: center;
      gap: 4px;
      position: relative;
    }
    .text-link::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary-red);
      transition: width 0.25s ease;
    }
    .text-link:hover::after {
      width: 100%;
    }

    /* 卡片 */
    .card {
      background: var(--card-white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 28px 24px;
      box-shadow: var(--shadow-card);
      transition: transform 0.2s, box-shadow 0.2s;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }

    /* Hero 斜切分隔 */
    .hero-clip {
      position: relative;
      background: var(--warm-bg);
    }
    .hero-clip::after {
      content: '';
      position: absolute;
      bottom: -40px;
      left: 0;
      width: 100%;
      height: 80px;
      background: var(--warm-bg);
      clip-path: polygon(0 0, 100% 60px, 100% 100%, 0 100%);
      z-index: 2;
    }

    /* 数据区 */
    .data-block {
      background: var(--deep-black);
      padding: 80px 0;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 48px;
      font-weight: 700;
      color: var(--champion-gold);
      line-height: 1.2;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }
    .faq-question {
      font-size: 18px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-icon {
      font-size: 20px;
      color: var(--primary-red);
      transition: transform 0.25s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s;
      color: var(--text-secondary);
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-top: 12px;
    }
    .faq-item.open .faq-icon {
      transform: rotate(45deg);
    }

    /* 区块间距 */
    section {
      padding: 80px 0;
    }

    @media (max-width: 1023px) {
      .desktop-nav { display: none; }
      .hamburger { display: flex; }
      .stat-number { font-size: 36px; }
      section { padding: 60px 0; }
    }
    @media (max-width: 767px) {
      .hero-clip::after { bottom: -20px; height: 50px; }
      .container { padding-left: 16px; padding-right: 16px; }
      h1 { font-size: 32px !important; }
      h2 { font-size: 28px !important; }
      .stat-number { font-size: 32px; }
      .mobile-menu { display: none; }
    }