/* roulang page: index */
:root {
      --primary-purple: #7B2FBE;
      --accent-orange: #FF6B1A;
      --dark-bg: #0F0A1A;
      --light-bg: #F8F6FC;
      --card-bg: #FFFFFF;
      --text-main: #2D2A3A;
      --text-soft: #6B6880;
      --border-color: #E2DFED;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --shadow-card: 0 2px 12px rgba(123,47,190,0.08);
      --shadow-hover: 0 8px 30px rgba(123,47,190,0.18);
      --shadow-cta: 0 4px 20px rgba(255,107,26,0.4);
      --font-title: 'Orbitron', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      background-color: #fff;
      color: var(--text-main);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(15,10,26,0.92);
      backdrop-filter: blur(12px);
      display: flex;
      align-items: center;
      justify-content: center;
      z-index: 1000;
      border-bottom: 1px solid rgba(255,255,255,0.05);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1280px;
      padding: 0 24px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-family: var(--font-title);
      font-size: 1.3rem;
      font-weight: 700;
      background: linear-gradient(135deg, #7B2FBE, #FF6B1A);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .logo svg {
      flex-shrink: 0;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      font-size: 0.95rem;
      font-weight: 500;
      color: #B8B5CC;
      transition: color 0.2s;
      position: relative;
      padding-bottom: 4px;
    }
    .nav-links a:hover {
      color: #FFFFFF;
    }
    .nav-links a.active {
      color: var(--accent-orange);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--accent-orange);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 25px;
      height: 3px;
      background: #fff;
      border-radius: 3px;
      transition: 0.3s;
    }
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(15,10,26,0.98);
      backdrop-filter: blur(16px);
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: flex-start;
      padding-left: 40px;
      gap: 28px;
      transform: translateX(-100%);
      transition: transform 0.3s ease;
      z-index: 999;
    }
    .mobile-menu.open {
      transform: translateX(0);
    }
    .mobile-menu a {
      font-size: 1.2rem;
      color: #B8B5CC;
      font-weight: 500;
    }
    .mobile-menu a.active {
      color: var(--accent-orange);
    }
    /* Hero */
    .hero {
      background-color: var(--dark-bg);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      padding: 140px 0 100px;
      min-height: 90vh;
      display: flex;
      align-items: center;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 40%, rgba(123,47,190,0.45) 0%, rgba(15,10,26,0.8) 70%);
    }
    .hero .container {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      gap: 40px;
      flex-wrap: wrap;
    }
    .hero-left {
      flex: 1 1 55%;
    }
    .hero-right {
      flex: 1 1 40%;
      display: flex;
      justify-content: center;
    }
    .hero-right img {
      max-height: 380px;
      border-radius: 24px;
      filter: drop-shadow(0 0 30px rgba(123,47,190,0.5));
    }
    .hero h1 {
      font-family: var(--font-title);
      font-size: clamp(2.2rem, 5vw, 3.5rem);
      font-weight: 800;
      line-height: 1.2;
      color: #fff;
      margin-bottom: 24px;
    }
    .hero-sub {
      font-size: 1.1rem;
      color: #ccc;
      margin-bottom: 32px;
      max-width: 500px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, #7B2FBE, #FF6B1A);
      color: #fff;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: all 0.25s;
      box-shadow: var(--shadow-cta);
      font-size: 1rem;
    }
    .btn-primary:hover {
      background: linear-gradient(135deg, #FF6B1A, #7B2FBE);
      transform: translateY(-2px);
      box-shadow: 0 8px 25px rgba(255,107,26,0.5);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid #fff;
      color: #fff;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: 0.25s;
    }
    .btn-outline:hover {
      background: rgba(123,47,190,0.15);
      border-color: var(--primary-purple);
    }
    /* 板块通用 */
    section {
      padding: 90px 0;
    }
    .section-title {
      font-family: var(--font-title);
      font-size: clamp(1.6rem, 3.5vw, 2.4rem);
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--text-main);
      text-align: center;
    }
    .section-sub {
      color: var(--text-soft);
      text-align: center;
      max-width: 600px;
      margin: 0 auto 48px;
    }
    /* 亮点网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .feature-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-card);
      transition: all 0.3s;
      border: 1px solid var(--border-color);
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .feature-card.large {
      grid-column: span 2;
    }
    .feature-card:hover {
      border-color: var(--primary-purple);
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .feature-icon {
      width: 48px;
      height: 48px;
      background: var(--primary-purple);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
    }
    .feature-card h3 {
      font-size: 1.25rem;
      font-weight: 600;
    }
    /* 案例瀑布流 */
    .masonry {
      column-count: 3;
      column-gap: 24px;
    }
    .case-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      break-inside: avoid;
      margin-bottom: 24px;
      transition: all 0.3s;
      border: 1px solid var(--border-color);
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: var(--primary-purple);
    }
    .case-img {
      width: 100%;
      display: block;
      border-radius: 12px 12px 0 0;
    }
    .case-content {
      padding: 20px;
    }
    .tags {
      display: flex;
      gap: 8px;
      margin-bottom: 12px;
    }
    .tag {
      font-size: 0.75rem;
      border: 1px solid var(--primary-purple);
      color: var(--primary-purple);
      padding: 4px 12px;
      border-radius: 20px;
      font-weight: 500;
    }
    .case-card h3 {
      font-size: 1.1rem;
      font-weight: 600;
      margin-bottom: 8px;
    }
    /* 对比表 */
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .plan-card {
      background: var(--card-bg);
      border-radius: 16px;
      padding: 32px;
      border: 1px solid var(--border-color);
      transition: 0.3s;
      position: relative;
    }
    .plan-recommend {
      border-color: var(--accent-orange);
      box-shadow: 0 0 20px rgba(255,107,26,0.15);
    }
    .badge {
      background: var(--accent-orange);
      color: #fff;
      font-size: 0.8rem;
      padding: 4px 14px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 12px;
    }
    .plan-title {
      font-size: 1.5rem;
      font-weight: 700;
    }
    .price {
      font-size: 2rem;
      font-weight: 800;
      color: var(--accent-orange);
    }
    .compare-table {
      width: 100%;
      margin: 24px 0;
      border-collapse: collapse;
    }
    .compare-table td {
      padding: 12px 0;
      border-bottom: 1px solid var(--border-color);
    }
    /* FAQ */
    .faq-group {
      margin-bottom: 40px;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-color);
      padding: 16px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 1.05rem;
      cursor: pointer;
      gap: 12px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: #4A475C;
    }
    .faq-answer.open {
      max-height: 200px;
      padding-top: 12px;
    }
    /* CTA横幅 */
    .cta-banner {
      background: #0F0A1A;
      background-image: radial-gradient(circle at 70% 50%, rgba(255,107,26,0.2) 0%, transparent 60%);
      text-align: center;
      padding: 100px 0;
    }
    .cta-banner h2 {
      color: #fff;
      font-family: var(--font-title);
    }
    /* 页脚 */
    .footer {
      background: #0A0614;
      color: #8B87A0;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
    }
    .footer a:hover {
      color: var(--accent-orange);
    }
    .copyright {
      background: #06030D;
      text-align: center;
      padding: 16px 0;
      font-size: 0.8rem;
    }
    @media (max-width: 1024px) {
      .features-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .feature-card.large {
        grid-column: span 1;
      }
      .masonry {
        column-count: 2;
      }
      .compare-grid {
        grid-template-columns: 1fr;
      }
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .hero .container {
        flex-direction: column;
      }
      .features-grid, .masonry {
        grid-template-columns: 1fr;
        column-count: 1;
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }