/* roulang page: index */
:root {
      --primary: #7C3AED;
      --primary-dark: #6D28D9;
      --secondary: #FF6B6B;
      --secondary-dark: #EE5A5A;
      --bg-dark: #0F0A1A;
      --bg-deep: #1E1345;
      --bg-light: #F8F7FA;
      --card-white: #FFFFFF;
      --text-dark: #1A1A2E;
      --text-muted: #6B7280;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --shadow-card: 0 4px 24px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 32px rgba(124,58,237,0.12);
      --transition: 0.3s ease;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-title: "PingFang SC", "Microsoft YaHei", sans-serif;
      --font-number: "Inter", "SF Pro Display", sans-serif;
      --container-max: 1200px;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.7;
      font-size: 1rem;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button, input, textarea {
      font-family: inherit;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 20px;
    }

    @media (max-width: 640px) {
      .container {
        padding: 0 16px;
      }
    }

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

    .nav.scrolled {
      background: rgba(15,10,26,0.92);
      backdrop-filter: blur(12px);
      box-shadow: 0 1px 0 rgba(255,255,255,0.08);
    }

    .nav .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      font-family: var(--font-title);
      font-size: 1.25rem;
      font-weight: 700;
      color: #fff;
      letter-spacing: 0.5px;
      background: linear-gradient(135deg, #fff 0%, #d4bfff 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

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

    .nav-links a {
      color: rgba(255,255,255,0.8);
      font-size: 0.95rem;
      font-weight: 500;
      position: relative;
      padding: 4px 0;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--secondary);
      transition: width 0.3s ease;
    }

    .nav-links a:hover {
      color: var(--secondary);
    }

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

    .nav-cta {
      border: 2px solid var(--primary);
      color: #fff;
      padding: 8px 20px;
      border-radius: 30px;
      font-size: 0.9rem;
      font-weight: 600;
      transition: var(--transition);
      background: transparent;
    }

    .nav-cta:hover {
      background: var(--primary);
      color: #fff;
      box-shadow: 0 0 16px rgba(124,58,237,0.5);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      cursor: pointer;
      gap: 5px;
      background: none;
      border: none;
      padding: 4px;
    }

    .hamburger span {
      width: 24px;
      height: 2px;
      background: #fff;
      border-radius: 2px;
      transition: 0.3s;
    }

    .mobile-menu {
      position: fixed;
      top: 0;
      right: -100%;
      width: 100%;
      height: 100vh;
      background: var(--bg-dark);
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 32px;
      transition: right 0.4s ease;
      z-index: 99;
    }

    .mobile-menu.active {
      right: 0;
    }

    .mobile-menu a {
      font-size: 1.5rem;
      font-weight: 600;
      color: #fff;
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #0F0A1A 0%, #1E1345 50%, #0F0A1A 100%);
      min-height: 90vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }

    .hero::before {
      content: "";
      position: absolute;
      inset: 0;
      background-image: radial-gradient(circle at 20% 40%, rgba(124,58,237,0.2) 0%, transparent 40%);
      pointer-events: none;
    }

    .particles {
      position: absolute;
      inset: 0;
      pointer-events: none;
      background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" opacity="0.08"><circle cx="20" cy="30" r="1" fill="white"/><circle cx="80" cy="70" r="1.2" fill="white"/><circle cx="45" cy="20" r="0.8" fill="white"/></svg>');
      background-size: 180px 180px;
    }

    .hero .container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
      position: relative;
      z-index: 2;
      width: 100%;
    }

    .hero-content h1 {
      font-family: var(--font-title);
      font-size: clamp(2.5rem, 5vw, 3.5rem);
      font-weight: 800;
      line-height: 1.2;
      color: #fff;
      margin-bottom: 20px;
    }

    .hero-content p {
      font-size: 1.125rem;
      color: rgba(255,255,255,0.7);
      margin-bottom: 36px;
      max-width: 90%;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--secondary);
      color: #fff;
      font-weight: 700;
      padding: 14px 32px;
      border-radius: 30px;
      font-size: 1rem;
      border: none;
      cursor: pointer;
      box-shadow: 0 0 20px rgba(255,107,107,0.4);
      transition: var(--transition);
      display: inline-block;
    }

    .btn-primary:hover {
      background: var(--secondary-dark);
      transform: scale(1.03);
    }

    .btn-secondary {
      background: transparent;
      border: 2px solid var(--primary);
      color: #fff;
      padding: 14px 32px;
      border-radius: 30px;
      font-weight: 600;
      transition: var(--transition);
    }

    .btn-secondary:hover {
      background: var(--primary);
      border-color: var(--primary);
    }

    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 24px;
      height: 400px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
      border: 1px solid rgba(255,255,255,0.2);
      animation: float 6s ease-in-out infinite;
    }

    @keyframes float {
      0% { transform: translateY(0px); }
      50% { transform: translateY(-8px); }
      100% { transform: translateY(0px); }
    }

    @media (max-width: 768px) {
      .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-content p {
        max-width: 100%;
        margin-left: auto;
        margin-right: auto;
      }
      .hero-buttons {
        justify-content: center;
      }
      .hero-image {
        height: 280px;
        order: -1;
      }
    }

    /* 区块通用 */
    section {
      padding: 100px 0;
    }

    @media (max-width: 640px) {
      section {
        padding: 70px 0;
      }
    }

    .section-title {
      font-family: var(--font-title);
      font-size: 2.25rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--text-dark);
    }

    .section-sub {
      color: var(--text-muted);
      font-size: 1.1rem;
      margin-bottom: 48px;
    }

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

    .feature-card {
      background: var(--card-white);
      border-radius: var(--radius-lg);
      padding: 28px;
      box-shadow: var(--shadow-card);
      display: flex;
      gap: 20px;
      align-items: flex-start;
      transition: var(--transition);
    }

    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    .feature-icon {
      width: 44px;
      height: 44px;
      background: rgba(124,58,237,0.1);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      color: var(--primary);
      flex-shrink: 0;
    }

    .feature-text h3 {
      font-weight: 700;
      font-size: 1.2rem;
      margin-bottom: 8px;
    }

    .feature-text p {
      color: var(--text-muted);
      font-size: 0.95rem;
    }

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

    /* 案例瀑布流 */
    .showcase-grid {
      column-count: 3;
      column-gap: 24px;
    }

    .showcase-card {
      break-inside: avoid;
      background: var(--card-white);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      margin-bottom: 24px;
      transition: var(--transition);
    }

    .showcase-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    .showcase-img {
      height: 200px;
      background-size: cover;
      background-position: center;
      transition: transform 0.4s ease;
    }

    .showcase-card:hover .showcase-img {
      transform: scale(1.03);
    }

    .showcase-info {
      padding: 20px;
    }

    .showcase-info h4 {
      font-weight: 700;
      margin-bottom: 4px;
    }

    .tag {
      background: rgba(124,58,237,0.08);
      color: var(--primary);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
    }

    @media (max-width: 768px) {
      .showcase-grid {
        column-count: 2;
      }
    }
    @media (max-width: 480px) {
      .showcase-grid {
        column-count: 1;
      }
    }

    /* 对比表 */
    .comparison-wrapper {
      overflow-x: auto;
      border-radius: var(--radius-lg);
      background: var(--card-white);
      box-shadow: var(--shadow-card);
    }

    table {
      width: 100%;
      border-collapse: collapse;
      min-width: 640px;
    }

    th {
      background: #F8F7FA;
      padding: 18px;
      font-weight: 700;
      text-align: left;
    }

    td {
      padding: 18px;
      border-bottom: 1px solid #f0f0f0;
    }

    .highlight-col {
      background: rgba(124,58,237,0.03);
    }

    .badge {
      background: var(--secondary);
      color: #fff;
      font-size: 0.7rem;
      padding: 2px 10px;
      border-radius: 20px;
      margin-left: 8px;
    }

    /* FAQ */
    .faq-item {
      background: var(--card-white);
      border-radius: var(--radius-md);
      margin-bottom: 16px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
      overflow: hidden;
    }

    .faq-question {
      display: flex;
      align-items: center;
      padding: 20px 24px;
      cursor: pointer;
      font-weight: 600;
      gap: 16px;
    }

    .faq-num {
      font-size: 2rem;
      font-weight: 800;
      color: rgba(124,58,237,0.2);
      width: 40px;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background: #fafafa;
      padding: 0 24px;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px 24px;
    }

    /* CTA */
    .cta-section {
      background: var(--bg-dark);
      color: #fff;
    }

    .cta-form {
      display: flex;
      flex-direction: column;
      gap: 20px;
      max-width: 480px;
      margin: 0 auto;
    }

    .input-field {
      background: transparent;
      border: none;
      border-bottom: 2px solid rgba(255,255,255,0.3);
      padding: 12px 4px;
      color: #fff;
      font-size: 1rem;
      outline: none;
      transition: border-color 0.3s;
    }

    .input-field:focus {
      border-bottom-color: var(--primary);
    }

    .btn-submit {
      background: var(--secondary);
      border: none;
      color: #fff;
      font-weight: 700;
      padding: 16px;
      border-radius: 30px;
      font-size: 1.1rem;
      cursor: pointer;
      transition: var(--transition);
    }

    .btn-submit:hover {
      background: var(--secondary-dark);
    }

    footer {
      background: var(--bg-dark);
      color: rgba(255,255,255,0.6);
      padding: 48px 0 24px;
    }

    .footer-grid {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 32px;
    }