/* roulang page: index */
:root {
      --color-primary: #E63946;
      --color-primary-hover: #C1121F;
      --color-dark: #1D1D1F;
      --color-gray: #EFEFEF;
      --color-white: #F8F9FA;
      --color-gold: #F4A261;
      --color-green: #2A9D8F;
      --color-text: #1D1D1F;
      --color-muted: #6B7280;
      --color-border: rgba(0,0,0,0.06);
      --font-body: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-number: "Bebas Neue", "DIN Alternate", "PingFang SC", sans-serif;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 12px 28px rgba(0,0,0,0.12);
      --transition: all 0.25s ease;
      --max-width: 1280px;
    }

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

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

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

    button, .btn {
      cursor: pointer;
      font-family: var(--font-body);
      border: none;
      background: none;
      font-weight: 700;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: transparent;
      backdrop-filter: blur(0px);
      transition: background 0.3s, backdrop-filter 0.3s, box-shadow 0.3s;
      padding: 16px 0;
    }

    .navbar.scrolled {
      background: rgba(29, 29, 31, 0.88);
      backdrop-filter: blur(20px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.2);
      padding: 10px 0;
    }

    .navbar .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .logo {
      font-size: 26px;
      font-weight: 800;
      color: #fff;
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .navbar.scrolled .logo {
      color: #fff;
    }
    .logo i {
      color: var(--color-primary);
      font-size: 28px;
    }

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

    .nav-links a {
      color: rgba(255,255,255,0.9);
      font-weight: 500;
      font-size: 16px;
      position: relative;
      padding: 6px 0;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 0;
      height: 2px;
      background: var(--color-primary);
      transition: width 0.2s ease;
    }

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

    .nav-cta {
      background: var(--color-primary);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 15px;
    }
    .nav-cta:hover {
      background: var(--color-primary-hover);
      transform: scale(1.03);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
      padding: 8px;
      z-index: 1001;
    }
    .hamburger span {
      width: 26px;
      height: 3px;
      background: white;
      border-radius: 3px;
      transition: 0.3s;
    }
    .hamburger.active span:nth-child(1) {
      transform: rotate(45deg) translate(6px, 6px);
    }
    .hamburger.active span:nth-child(2) {
      opacity: 0;
    }
    .hamburger.active span:nth-child(3) {
      transform: rotate(-45deg) translate(6px, -6px);
    }

    .mobile-menu {
      position: fixed;
      top: 0;
      right: -100%;
      width: 80%;
      max-width: 320px;
      height: 100vh;
      background: var(--color-dark);
      backdrop-filter: blur(20px);
      display: flex;
      flex-direction: column;
      padding: 100px 32px 40px;
      transition: right 0.4s ease;
      z-index: 999;
      gap: 32px;
    }
    .mobile-menu.active {
      right: 0;
    }
    .mobile-menu a {
      color: white;
      font-size: 22px;
      font-weight: 600;
      border-bottom: 1px solid rgba(255,255,255,0.15);
      padding-bottom: 12px;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #1D1D1F 0%, #2B2B2F 100%);
      position: relative;
      overflow: hidden;
      padding-top: 80px;
    }

    .hero-content {
      display: flex;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
      gap: 48px;
      align-items: center;
      position: relative;
      z-index: 2;
    }

    .hero-left {
      flex: 1 1 50%;
      color: white;
    }

    .hero-h1 {
      font-size: 58px;
      font-weight: 800;
      line-height: 1.15;
      letter-spacing: 2px;
      margin-bottom: 24px;
      color: white;
    }
    .hero-h1 span {
      color: var(--color-primary);
    }
    .hero-sub {
      font-size: 20px;
      color: rgba(255,255,255,0.8);
      margin-bottom: 40px;
      line-height: 1.5;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--color-primary);
      color: white;
      padding: 16px 36px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 18px;
    }
    .btn-primary:hover {
      background: var(--color-primary-hover);
      transform: scale(1.04);
    }
    .btn-outline {
      border: 2px solid var(--color-primary);
      color: var(--color-primary);
      padding: 16px 36px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 18px;
      background: transparent;
    }
    .btn-outline:hover {
      background: rgba(230,57,70,0.1);
    }

    .hero-right {
      flex: 1 1 50%;
      position: relative;
      border-radius: 28px;
      overflow: hidden;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 520px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
      display: flex;
      align-items: flex-end;
      justify-content: flex-end;
    }
    .hero-right::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(225deg, rgba(230,57,70,0.7) 0%, transparent 60%);
    }
    .hero-badge {
      position: relative;
      background: var(--color-gold);
      color: #1D1D1F;
      font-weight: 800;
      padding: 12px 24px;
      border-radius: 8px 0 0 0;
      font-size: 20px;
      backdrop-filter: blur(10px);
      background: rgba(244,162,97,0.9);
    }

    @media (max-width: 1024px) {
      .hero-content {
        flex-direction: column;
        text-align: center;
      }
      .hero-left, .hero-right {
        flex: 1 1 auto;
        width: 100%;
      }
      .hero-right {
        min-height: 350px;
      }
    }

    /* 板块通用 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 42px;
      font-weight: 700;
      margin-bottom: 20px;
      text-align: center;
      color: var(--color-dark);
    }
    .section-sub {
      color: var(--color-muted);
      text-align: center;
      margin-bottom: 60px;
      font-size: 18px;
    }

    /* 亮点网格 */
    .features-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 28px;
      margin-bottom: 28px;
    }
    .features-grid-second {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .feature-card {
      background: white;
      padding: 36px 28px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      border: 1px solid var(--color-border);
      transition: var(--transition);
      position: relative;
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .feature-card i {
      font-size: 42px;
      color: var(--color-primary);
      margin-bottom: 20px;
    }
    .feature-card h3 {
      font-size: 26px;
      margin-bottom: 12px;
    }

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

    /* 瀑布流 */
    .masonry {
      columns: 3;
      column-gap: 24px;
    }
    .masonry-item {
      break-inside: avoid;
      margin-bottom: 24px;
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .masonry-item:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
    }
    .masonry-item img {
      width: 100%;
      height: auto;
      transition: 0.3s;
    }
    .masonry-item:hover img {
      transform: scale(1.04);
    }
    .masonry-text {
      padding: 22px;
    }
    @media (max-width: 1024px) {
      .masonry { columns: 2; }
    }
    @media (max-width: 640px) {
      .masonry { columns: 1; }
    }

    /* 对比表 */
    .compare-table {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      max-width: 900px;
      margin: 0 auto;
    }
    .compare-col {
      background: white;
      border-radius: var(--radius-card);
      padding: 40px 28px;
      box-shadow: var(--shadow-card);
    }
    .compare-col.pro {
      border-top: 8px solid var(--color-primary);
    }
    .compare-col.public {
      border-top: 8px solid var(--color-green);
    }
    @media (max-width: 768px) {
      .compare-table { grid-template-columns: 1fr; }
    }

    /* 数据区 */
    .stats {
      background: var(--color-dark);
      color: white;
      padding: 80px 0;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      text-align: center;
      gap: 32px;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 68px;
      color: white;
    }
    @media (max-width: 768px) {
      .stats-grid { grid-template-columns: 1fr 1fr; }
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid #ddd;
    }
    .faq-question {
      width: 100%;
      display: flex;
      justify-content: space-between;
      padding: 22px 0;
      font-weight: 700;
      font-size: 20px;
      background: transparent;
      border: none;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background: #f4f4f4;
      border-radius: 8px;
      margin-bottom: 12px;
    }
    .faq-answer.open {
      max-height: 300px;
      padding: 20px;
  }