/* roulang page: index */
:root {
      --color-primary: #0B2B26;
      --color-primary-light: #1B4D45;
      --color-accent: #E85D04;
      --color-accent-dark: #C94D00;
      --color-bg: #F5F7F6;
      --color-card-bg: #FFFFFF;
      --color-card-hover: #F0F4F3;
      --color-text: #1A1A1A;
      --color-text-secondary: #4A4A4A;
      --color-border: #E0E4E3;
      --color-white: #FFFFFF;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --shadow-card: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 8px 24px rgba(0,0,0,0.10);
      --shadow-hero: 0 12px 32px rgba(11,43,38,0.15);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      --font-number: "Inter", "SF Pro Display", system-ui, sans-serif;
      --transition-base: 0.25s ease;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--color-bg);
      color: var(--color-text);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    h1, h2, h3 {
      color: var(--color-primary);
    }

    a {
      text-decoration: none;
      color: inherit;
    }

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

    /* 导航 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      height: 72px;
      transition: background-color 0.3s ease, backdrop-filter 0.3s ease;
      display: flex;
      align-items: center;
    }

    .main-header.scrolled {
      background-color: var(--color-primary);
      backdrop-filter: blur(12px);
      box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--color-white);
      letter-spacing: 1px;
      transition: color 0.2s;
    }

    .logo-icon {
      width: 28px;
      height: 28px;
      background: var(--color-accent);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 16px;
      font-weight: bold;
      color: white;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-links a {
      color: var(--color-white);
      font-size: 0.95rem;
      font-weight: 500;
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }

    .nav-links a::after {
      content: "";
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--color-accent);
      transition: width 0.25s ease;
    }

    .nav-links a:hover::after,
    .nav-links a:focus-visible::after {
      width: 100%;
    }

    .btn-nav {
      background: var(--color-accent);
      color: white !important;
      padding: 10px 22px !important;
      border-radius: var(--radius-sm);
      font-weight: 600;
      transition: background 0.2s, box-shadow 0.2s;
    }

    .btn-nav:hover {
      background: var(--color-accent-dark);
      box-shadow: 0 4px 12px rgba(232,93,4,0.3);
    }

    .menu-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 8px;
    }

    .menu-toggle span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--color-white);
      transition: transform 0.3s, opacity 0.3s;
    }

    /* 移动端菜单 */
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 100%;
        height: 100vh;
        background: linear-gradient(135deg, var(--color-primary), #1B4D45);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 36px;
        transition: right 0.4s ease;
        z-index: 999;
      }
      .nav-links.active {
        right: 0;
      }
      .nav-links a {
        font-size: 1.4rem;
      }
      .menu-toggle {
        display: flex;
        z-index: 1001;
      }
      .menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
      }
      .menu-toggle.active span:nth-child(2) {
        opacity: 0;
      }
      .menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
      }
      .btn-nav {
        width: 80%;
        text-align: center;
      }
    }

    /* Hero */
    .hero {
      display: flex;
      align-items: center;
      min-height: 100vh;
      background: var(--color-bg);
      position: relative;
      overflow: hidden;
    }

    .hero-container {
      display: flex;
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
      gap: 40px;
      align-items: center;
    }

    .hero-left {
      flex: 5;
      z-index: 2;
    }

    .hero-right {
      flex: 7;
      position: relative;
    }

    .hero h1 {
      font-size: 3.2rem;
      font-weight: 700;
      line-height: 1.2;
      color: var(--color-primary);
      margin-bottom: 1.2rem;
      letter-spacing: -0.5px;
    }

    .hero-sub {
      font-size: 1.2rem;
      color: var(--color-text-secondary);
      margin-bottom: 2rem;
      max-width: 480px;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      margin-bottom: 2.5rem;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--color-accent);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: background 0.2s, box-shadow 0.2s;
      display: inline-block;
      text-align: center;
    }

    .btn-primary:hover {
      background: var(--color-accent-dark);
      box-shadow: 0 6px 18px rgba(232,93,4,0.4);
    }

    .btn-outline {
      background: transparent;
      color: var(--color-primary);
      border: 2px solid var(--color-primary);
      padding: 12px 30px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      transition: all 0.2s;
    }

    .btn-outline:hover {
      background: rgba(11,43,38,0.08);
    }

    .hero-badges {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    .badge-item {
      background: var(--color-card-bg);
      border-radius: var(--radius-sm);
      padding: 10px 16px;
      box-shadow: var(--shadow-card);
      text-align: center;
    }

    .badge-number {
      font-family: var(--font-number);
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--color-accent);
    }

    .badge-label {
      font-size: 0.8rem;
      color: var(--color-text-secondary);
    }

    .hero-image {
      width: 100%;
      height: 520px;
      object-fit: cover;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-hero);
    }

    .hero-overlay-card {
      position: absolute;
      bottom: 20px;
      right: 20px;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      padding: 16px 24px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      display: flex;
      align-items: center;
      gap: 12px;
    }

    @media (max-width: 1024px) {
      .hero-container {
        flex-direction: column;
        text-align: center;
      }
      .hero-left {
        order: 2;
        margin-top: 30px;
      }
      .hero-right {
        order: 1;
      }
      .hero-sub {
        max-width: 100%;
      }
      .hero-buttons, .hero-badges {
        justify-content: center;
      }
    }

    /* 通用板块 */
    section {
      padding: 80px 0;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 600;
      margin-bottom: 16px;
      text-align: center;
    }

    .section-desc {
      color: var(--color-text-secondary);
      text-align: center;
      max-width: 700px;
      margin: 0 auto 48px;
    }

    /* 核心亮点网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .feature-card {
      background: var(--color-card-bg);
      border-radius: var(--radius-lg);
      padding: 28px;
      box-shadow: var(--shadow-card);
      transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.2s;
    }

    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-card-hover);
      background: var(--color-card-hover);
    }

    .feature-icon {
      font-size: 2rem;
      margin-bottom: 20px;
    }

    .feature-card h3 {
      font-size: 1.3rem;
      margin-bottom: 12px;
    }

    .feature-desc {
      color: var(--color-text-secondary);
      font-size: 0.9rem;
      margin-bottom: 18px;
      display: -webkit-box;
      -webkit-line-clamp: 2;
      -webkit-box-orient: vertical;
      overflow: hidden;
    }

    .feature-tag {
      background: rgba(232,93,4,0.1);
      color: var(--color-accent);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 500;
    }

    @media (max-width: 768px) {
      .features-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 案例瀑布流 */
    .cases-masonry {
      columns: 3;
      column-gap: 24px;
    }

    .case-card {
      break-inside: avoid;
      margin-bottom: 24px;
      background: var(--color-card-bg);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: transform 0.2s;
    }

    .case-card:hover {
      transform: scale(1.02);
    }

    .case-img {
      width: 100%;
      display: block;
      aspect-ratio: 4/3;
      object-fit: cover;
    }

    .case-info {
      padding: 16px;
    }

    .case-tag {
      color: var(--color-accent);
      border: 1px solid var(--color-accent);
      padding: 2px 10px;
      border-radius: 20px;
      font-size: 0.75rem;
      display: inline-block;
      margin-bottom: 8px;
    }

    @media (max-width: 768px) {
      .cases-masonry {
        columns: 1;
      }
    }

    /* 方案对比 */
    .comparison-wrapper {
      display: flex;
      gap: 40px;
      align-items: stretch;
    }

    .comparison-col {
      flex: 1;
      background: var(--color-card-bg);
      border-radius: var(--radius-lg);
      padding: 32px;
    }

    .comparison-col.right {
      background: #F0F4F3;
    }

    .comparison-title {
      font-size: 1.5rem;
      font-weight: 600;
      margin-bottom: 24px;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .comparison-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 18px;
    }

    .advantage-badge {
      background: var(--color-accent);
      color: white;
      font-size: 0.7rem;
      padding: 2px 8px;
      border-radius: 20px;
      margin-left: 8px;
    }

    @media (max-width: 768px) {
      .comparison-wrapper {
        flex-direction: column;
      }
    }

    /* 荣誉墙 */
    .honor-grid {
      display: flex;
      justify-content: center;
      gap: 32px;
      flex-wrap: wrap;
    }

    .honor-card {
      background: var(--color-card-bg);
      border-radius: var(--radius-lg);
      padding: 24px 32px;
      text-align: center;
    }

    .honor-number {
      font-family: var(--font-number);
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--color-accent);
    }

    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
    }

    .faq-item {
      background: var(--color-card-bg);
      border-radius: var(--radius-md);
      padding: 16px 20px;
    }

    .faq-question {
      font-weight: 600;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--color-text-secondary);
      margin-top: 8px;
    }

    @media (max-width: 768px) {
      .faq-grid {
        grid-template-columns: 1fr;
      }
    }

    .cta-banner {
      background: linear-gradient(135deg, var(--color-primary), #1B4D45);
      border-radius: var(--radius-lg);
      padding: 64px 24px;
      text-align: center;
      color: white;
    }

    .btn-reverse {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      transition: 0.2s;
    }

    .btn-reverse:hover {
      background: white;
      color: var(--color-primary);
    }

    .footer {
      background: var(--color-primary);
      color: white;
      padding: 48px 0 24px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1.5fr 1fr;
      gap: 32px;
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }