/* roulang page: index */
:root {
      --primary-red: #D32F2F;
      --deep-red: #B71C1C;
      --charcoal: #1E1E1E;
      --asphalt: #2C2C2C;
      --warm-white: #FAFAF7;
      --card-bg: #FFFFFF;
      --border-light: #E8E8E4;
      --gray-text: #5A5A5A;
      --muted-bg: #F5F5F2;
      --neon-yellow: #C0FF00;
      --shadow-sm: 0 1px 4px rgba(0,0,0,0.08);
      --shadow-hover: 0 4px 16px rgba(0,0,0,0.12);
      --radius-md: 8px;
      --radius-pill: 40px;
      --font-sans: 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      --font-serif: 'Noto Serif SC', 'Times New Roman', serif;
      --font-mono: 'Roboto Mono', 'Courier New', monospace;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-serif);
      background-color: var(--warm-white);
      color: var(--asphalt);
      line-height: 1.8;
      font-size: 16px;
      margin: 0;
      padding-top: 100px;
    }
    h1, h2, h3, h4, .nav-link, .btn, .badge, .data-number, .mono-text {
      font-family: var(--font-sans);
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s, background-color 0.2s;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      max-width: 1200px;
      padding-left: 20px;
      padding-right: 20px;
    }
    /* 浮动导航 Dock */
    .navbar-dock {
      position: fixed;
      top: 16px;
      left: 50%;
      transform: translateX(-50%);
      width: calc(100% - 32px);
      max-width: 720px;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      border-radius: var(--radius-pill);
      border: 1px solid rgba(0,0,0,0.06);
      box-shadow: 0 2px 20px rgba(0,0,0,0.04);
      padding: 8px 24px;
      z-index: 1050;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .logo-text {
      font-family: var(--font-sans);
      font-weight: 900;
      font-size: 1.5rem;
      color: var(--asphalt);
      letter-spacing: 1px;
    }
    .logo-text small {
      font-weight: 400;
      font-size: 0.7rem;
      color: var(--gray-text);
      display: block;
      letter-spacing: 0.5px;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 20px;
    }
    .nav-link {
      font-size: 0.875rem;
      font-weight: 500;
      color: var(--asphalt);
      padding: 4px 8px;
      border-radius: 20px;
      transition: 0.2s;
    }
    .nav-link:hover {
      color: var(--primary-red);
    }
    .btn-nav-cta {
      background: var(--primary-red);
      color: white;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 6px 16px;
      border-radius: 20px;
      border: none;
      transition: 0.2s;
      margin-left: 8px;
    }
    .btn-nav-cta:hover {
      background: var(--deep-red);
      color: white;
    }
    .hamburger-menu {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--asphalt);
    }
    @media (max-width: 768px) {
      .nav-menu {
        display: none;
        position: absolute;
        top: 70px;
        left: 20px;
        right: 20px;
        background: white;
        flex-direction: column;
        border-radius: 24px;
        box-shadow: var(--shadow-hover);
        padding: 20px;
        gap: 12px;
      }
      .nav-menu.active {
        display: flex;
      }
      .hamburger-menu {
        display: block;
      }
      .navbar-dock {
        padding: 8px 20px;
      }
    }
    /* Hero */
    .hero-section {
      padding: 40px 0 80px;
    }
    .hero-title {
      font-size: 3rem;
      font-weight: 900;
      color: var(--asphalt);
      line-height: 1.2;
    }
    .hero-desc {
      font-size: 1.125rem;
      color: var(--gray-text);
    }
    .data-badge-group {
      display: flex;
      gap: 30px;
      margin: 30px 0;
    }
    .data-badge .number {
      font-family: var(--font-mono);
      font-size: 2rem;
      font-weight: 700;
      color: var(--neon-yellow);
      background: var(--asphalt);
      padding: 2px 8px;
      display: inline-block;
      border-radius: 4px;
    }
    .data-badge span {
      display: block;
      font-size: 0.9rem;
      color: var(--gray-text);
    }
    .hero-image-wrapper {
      position: relative;
      clip-path: polygon(4% 0%, 100% 0%, 96% 100%, 0% 100%);
    }
    .hero-image-wrapper img {
      width: 100%;
      height: auto;
      object-fit: cover;
      aspect-ratio: 4/3;
      filter: brightness(0.95);
    }
    .hero-tag {
      position: absolute;
      bottom: 16px;
      right: 16px;
      background: rgba(211,47,47,0.9);
      color: white;
      padding: 6px 18px;
      font-weight: 700;
      font-size: 0.9rem;
    }
    @media (max-width: 768px) {
      .hero-title {
        font-size: 2.4rem;
      }
      .data-badge-group {
        flex-wrap: wrap;
        gap: 20px;
      }
    }
    /* 按钮 */
    .btn-primary-red {
      background: var(--primary-red);
      border: 2px solid var(--primary-red);
      color: white;
      font-weight: 700;
      padding: 12px 28px;
      border-radius: 30px;
      transition: 0.25s;
    }
    .btn-primary-red:hover {
      background: var(--deep-red);
      border-color: var(--deep-red);
      color: white;
    }
    .btn-outline-red {
      background: transparent;
      border: 2px solid var(--primary-red);
      color: var(--primary-red);
      font-weight: 700;
      padding: 12px 28px;
      border-radius: 30px;
      transition: 0.25s;
    }
    .btn-outline-red:hover {
      background: var(--primary-red);
      color: white;
    }
    .btn-link-neon {
      color: var(--asphalt);
      font-weight: 600;
      position: relative;
      padding-bottom: 2px;
    }
    .btn-link-neon::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: 0;
      width: 0;
      height: 2px;
      background: var(--neon-yellow);
      transition: width 0.3s;
    }
    .btn-link-neon:hover::after {
      width: 100%;
    }
    /* 卡片 */
    .highlight-card {
      background: var(--card-bg);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: 0.2s;
    }
    .highlight-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .icon-red {
      color: var(--primary-red);
      font-size: 2rem;
    }
    /* 案例瀑布流 */
    .masonry-grid {
      column-count: 2;
      column-gap: 24px;
    }
    .masonry-item {
      break-inside: avoid;
      margin-bottom: 24px;
      background: white;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
      overflow: hidden;
      transition: 0.2s;
    }
    .masonry-item:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .masonry-item img {
      width: 100%;
      height: auto;
      transition: 0.3s;
    }
    .masonry-item:hover img {
      transform: scale(1.03);
    }
    @media (max-width: 768px) {
      .masonry-grid {
        column-count: 1;
      }
    }
    /* 对比表 */
    .compare-table {
      background: white;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-light);
    }
    .old-mode {
      background: #F5F5F2;
    }
    .new-mode {
      background: white;
      border-left: 4px solid var(--neon-yellow);
    }
    /* FAQ */
    .accordion-button:not(.collapsed) {
      background-color: #FAFAF7;
      color: var(--asphalt);
      font-weight: 700;
    }
    .accordion-button:focus {
      box-shadow: none;
      border-color: var(--border-light);
    }
    /* CTA 横幅 */
    .cta-banner {
      background: var(--charcoal);
      background-image: url('/assets/images/backpic/back-2.webp');
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
      position: relative;
    }
    .cta-banner::before {
      content: '';
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: rgba(30,30,30,0.85);
    }
    .cta-content {
      position: relative;
      z-index: 2;
    }
    footer a:hover {
      color: var(--primary-red);
      text-decoration: underline;
    }