/* roulang page: index */
:root {
      --primary: #E43D2A;
      --primary-dark: #B83020;
      --secondary: #1A1D23;
      --bg: #F9F7F4;
      --text-primary: #1A1D23;
      --text-secondary: #5C5F66;
      --accent: #2E8B57;
      --decorative: #D4A853;
      --card-radius: 12px;
      --btn-radius: 8px;
      --shadow-sm: 0 2px 12px rgba(26,29,35,0.06);
      --shadow-hover: 0 8px 24px rgba(26,29,35,0.12);
      --font-number: 'DIN Alternate', 'Bebas Neue', 'Oswald', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', 'Noto Sans SC', sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: var(--font-body);
      background-color: var(--bg);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    img {
      max-width: 100%;
      display: block;
      height: auto;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }

    button, .btn {
      cursor: pointer;
      font-family: var(--font-body);
      font-weight: 600;
      border: none;
      outline: none;
      transition: all 0.2s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border-radius: var(--btn-radius);
      padding: 10px 24px;
      font-size: 16px;
    }

    input, select {
      font-family: var(--font-body);
      border-radius: var(--btn-radius);
      border: 1px solid #ddd;
      padding: 14px 16px;
      font-size: 16px;
      width: 100%;
      background: white;
      color: var(--text-primary);
      outline: none;
    }
    input:focus, select:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(228,61,42,0.1);
    }

    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* Header / Navigation */
    header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0,0,0,0.05);
      height: 64px;
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      font-weight: 700;
      font-size: 22px;
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 4px;
    }
    .logo .brand-dark {
      color: var(--text-primary);
    }
    .logo .brand-red {
      color: var(--primary);
    }
    .nav-tabs {
      display: flex;
      gap: 8px;
      align-items: center;
    }
    .nav-chip {
      padding: 8px 18px;
      border-radius: 20px;
      font-size: 15px;
      font-weight: 500;
      color: var(--text-secondary);
      background: transparent;
      transition: all 0.2s;
      white-space: nowrap;
    }
    .nav-chip:hover {
      background: rgba(228,61,42,0.08);
      color: var(--primary);
    }
    .nav-chip.active {
      background: var(--primary);
      color: white;
      font-weight: 600;
    }
    .header-cta {
      background: var(--primary);
      color: white;
      padding: 10px 24px;
      border-radius: 20px;
      font-weight: 600;
      white-space: nowrap;
    }
    .header-cta:hover {
      background: var(--primary-dark);
      transform: translateY(-1px);
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-primary);
    }
    @media (max-width: 768px) {
      .nav-tabs { display: none; }
      .header-cta.desktop { display: none; }
      .mobile-menu-btn { display: block; }
    }
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(26,29,35,0.96);
      backdrop-filter: blur(20px);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
      z-index: 60;
      transform: translateX(100%);
      transition: transform 0.3s ease;
    }
    .mobile-menu.open {
      transform: translateX(0);
    }
    .mobile-menu a {
      color: white;
      font-size: 24px;
      font-weight: 600;
    }
    .mobile-menu .close-btn {
      position: absolute;
      top: 20px;
      right: 24px;
      font-size: 32px;
      color: white;
      background: none;
      border: none;
    }