/* roulang page: index */
:root {
      --primary-dark: #0A0A14;
      --primary-bg: #0F0F1A;
      --card-bg: #1A1A2E;
      --text-main: #F0E6FF;
      --text-secondary: #C0C0D8;
      --text-muted: #A0A0C0;
      --text-label: #8888AA;
      --gold-highlight: #FFD700;
      --border-dim: #2A2A4A;
      --border-glow: rgba(123,47,247,0.5);
      --gradient-main: linear-gradient(135deg, #7B2FF7 0%, #F72F6B 100%);
      --gradient-button-hover: linear-gradient(135deg, #9B4FF7 0%, #F75F8B 100%);
      --shadow-card: 0 8px 32px rgba(123,47,247,0.15);
      --shadow-card-hover: 0 12px 40px rgba(247,47,107,0.25);
      --radius-xl: 20px;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 10px;
      --radius-xs: 8px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      --font-number: 'Inter', 'SF Pro Display', sans-serif;
      --max-width: 1280px;
      --section-gap: 120px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--primary-dark);
      color: var(--text-main);
      line-height: 1.7;
      overflow-x: hidden;
    }
    h1, h2, h3, .number-font {
      font-family: var(--font-sans);
    }
    .number-font, .badge-number {
      font-family: var(--font-number);
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
    }
    input, textarea {
      font-family: inherit;
    }
    .container {
      max-width: var(--max-width);
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    /* 导航卡片面板 */
    .nav-panel {
      position: sticky;
      top: 16px;
      z-index: 50;
      margin-top: 16px;
      background: rgba(26,26,46,0.85);
      backdrop-filter: blur(20px);
      border-radius: var(--radius-xl);
      border: 1px solid rgba(255,255,255,0.06);
      box-shadow: 0 4px 16px rgba(0,0,0,0.3);
      padding: 8px 16px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: box-shadow 0.3s ease;
    }
    .nav-panel.scrolled {
      box-shadow: 0 8px 24px rgba(123,47,247,0.2);
    }
    .nav-logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.125rem;
      color: var(--text-main);
      letter-spacing: 1px;
    }
    .logo-icon {
      width: 28px;
      height: 28px;
      background: var(--gradient-main);
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 800;
      font-size: 14px;
    }
    .nav-links {
      display: flex;
      gap: 8px;
      flex-wrap: wrap;
    }
    .nav-link-item {
      background: rgba(255,255,255,0.04);
      border-radius: var(--radius-md);
      padding: 10px 16px;
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-muted);
      display: flex;
      align-items: center;
      gap: 6px;
      transition: all 0.25s;
      border: 1px solid transparent;
    }
    .nav-link-item:hover, .nav-link-item.active {
      background: rgba(123,47,247,0.15);
      color: var(--gold-highlight);
      border-color: rgba(255,215,0,0.3);
    }
    .nav-cta {
      background: var(--gradient-main);
      border-radius: var(--radius-md);
      padding: 12px 24px;
      color: white;
      font-weight: 600;
      font-size: 0.95rem;
      transition: all 0.25s;
      white-space: nowrap;
      box-shadow: 0 4px 16px rgba(247,47,107,0.3);
    }
    .nav-cta:hover {
      filter: brightness(1.15);
      box-shadow: 0 0 24px rgba(247,47,107,0.5);
      transform: scale(1.03);
    }
    .hamburger {
      display: none;
      background: rgba(255,255,255,0.08);
      border-radius: 10px;
      padding: 10px;
      color: white;
      font-size: 1.5rem;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(10,10,20,0.97);
      backdrop-filter: blur(20px);
      z-index: 60;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 24px;
    }
    .mobile-menu.active {
      display: flex;
    }
    .mobile-menu a, .mobile-menu .nav-link-item {
      font-size: 1.5rem;
      background: transparent;
      color: var(--text-main);
    }
    /* Hero双栏 */
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
      margin-top: 40px;
      padding-top: 40px;
      padding-bottom: 60px;
      position: relative;
    }
    .hero-bg-dot {
      position: absolute;
      top:0; left:0; width:100%; height:100%;
      background-image: radial-gradient(rgba(123,47,247,0.1) 1px, transparent 1px);
      background-size: 32px 32px;
      pointer-events: none;
    }
    .hero-left {
      position: relative;
      z-index: 2;
    }
    .brand-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: rgba(123,47,247,0.15);
      border-radius: 20px;
      padding: 6px 16px;
      margin-bottom: 24px;
      color: var(--gold-highlight);
      font-weight: 600;
      font-size: 0.9rem;
    }
    .hero-title {
      font-size: 3rem;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 20px;
      background: var(--gradient-main);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .hero-sub {
      font-size: 1.25rem;
      color: var(--text-secondary);
      margin-bottom: 28px;
    }
    .hero-stats {
      display: flex;
      gap: 24px;
      margin-bottom: 32px;
      flex-wrap: wrap;
    }
    .stat-item {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      padding: 12px 18px;
      text-align: center;
    }
    .stat-number {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--gold-highlight);
      font-family: var(--font-number);
    }
    .stat-label {
      font-size: 0.8rem;
      color: var(--text-label);
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--gradient-main);
      padding: 14px 32px;
      border-radius: var(--radius-md);
      color: white;
      font-weight: 700;
      transition: all 0.25s;
      box-shadow: 0 4px 20px rgba(247,47,107,0.3);
    }
    .btn-primary:hover {
      filter: brightness(1.15);
      box-shadow: 0 0 28px rgba(247,47,107,0.6);
      transform: scale(1.03);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid #7B2FF7;
      padding: 14px 32px;
      border-radius: var(--radius-md);
      color: var(--text-main);
      font-weight: 600;
      transition: all 0.25s;
    }
    .btn-outline:hover {
      border-color: #F72F6B;
      background: rgba(123,47,247,0.1);
      box-shadow: 0 0 20px rgba(123,47,247,0.4);
    }
    .hero-right {
      position: relative;
      z-index: 2;
    }
    .hero-image-card {
      border-radius: 24px;
      overflow: hidden;
      border: 1px solid rgba(255,255,255,0.08);
      box-shadow: var(--shadow-card);
      position: relative;
    }
    .hero-image-card img {
      width: 100%;
      height: auto;
      object-fit: cover;
      aspect-ratio: 4/3;
      display: block;
    }
    .hero-image-overlay {
      position: absolute;
      top: 0; left: 0;
      width: 100%; height: 100%;
      background: linear-gradient(135deg, rgba(123,47,247,0.3), rgba(247,47,107,0.2));
    }
    /* 通用板块标题 */
    .section-title {
      font-size: 2.25rem;
      font-weight: 700;
      text-align: center;
      margin-bottom: 12px;
      color: var(--text-main);
    }
    .section-line {
      width: 60px;
      height: 4px;
      background: var(--gradient-main);
      margin: 0 auto 48px;
      border-radius: 4px;
    }
    section {
      padding: var(--section-gap) 0;
    }
    /* 优势网格 */
    .strength-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .strength-card {
      background: var(--card-bg);
      border-radius: var(--radius-xl);
      padding: 32px;
      border: 1px solid var(--border-dim);
      transition: all 0.3s;
      position: relative;
    }
    .strength-card:hover {
      transform: translateY(-6px);
      border-color: #7B2FF7;
      box-shadow: var(--shadow-card-hover);
    }
    .icon-circle {
      width: 56px;
      height: 56px;
      background: var(--gradient-main);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: white;
      font-size: 24px;
    }
    .strength-card h3 {
      font-size: 1.5rem;
      margin-bottom: 10px;
    }
    .strength-desc {
      color: var(--text-secondary);
      margin-bottom: 16px;
    }
    .badge-number {
      display: inline-block;
      background: rgba(255,215,0,0.1);
      color: var(--gold-highlight);
      padding: 4px 12px;
      border-radius: 20px;
      font-weight: 700;
      font-size: 1.2rem;
    }
    /* 案例瀑布流 */
    .cases-masonry {
      columns: 3;
      column-gap: 24px;
    }
    .case-card {
      background: var(--card-bg);
      border-radius: var(--radius-xl);
      overflow: hidden;
      margin-bottom: 24px;
      break-inside: avoid;
      border: 1px solid var(--border-dim);
      transition: all 0.3s;
    }
    .case-card:hover {
      transform: translateY(-4px);
      border-color: #7B2FF7;
    }
    .case-img {
      width: 100%;
      object-fit: cover;
      transition: transform 0.4s;
    }
    .case-card:hover .case-img {
      transform: scale(1.05);
    }
    .case-body {
      padding: 20px;
    }
    .case-body h3 {
      font-size: 1.3rem;
      margin-bottom: 8px;
    }
    .case-tags {
      display: flex;
      gap: 8px;
      flex-wrap: wrap;
      margin-top: 12px;
    }
    .tag {
      background: rgba(123,47,247,0.2);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      color: var(--text-muted);
    }
    /* 对比表 */
    .compare-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
    .compare-card {
      background: var(--card-bg);
      border-radius: var(--radius-xl);
      padding: 32px;
      border: 1px solid var(--border-dim);
      position: relative;
    }
    .compare-card.recommend {
      background: linear-gradient(135deg, rgba(123,47,247,0.2), rgba(247,47,107,0.2));
      border-color: #7B2FF7;
    }
    .badge-recommend {
      position: absolute;
      top: 16px;
      right: 16px;
      background: var(--gold-highlight);
      color: #0A0A14;
      padding: 4px 12px;
      border-radius: 20px;
      font-weight: 700;
    }
    .compare-card h3 {
      font-size: 1.5rem;
    }
    .compare-list {
      list-style: none;
      margin: 20px 0;
    }
    .compare-list li {
      padding: 8px 0;
      color: var(--text-secondary);
    }
    /* FAQ */
    .faq-container {
      background: var(--card-bg);
      border-radius: 24px;
      padding: 40px;
    }
    .faq-item {
      background: rgba(255,255,255,0.03);
      border-radius: 16px;
      margin-bottom: 12px;
      border-left: 4px solid transparent;
      transition: all 0.3s;
      cursor: pointer;
    }
    .faq-item.active {
      border-left-color: var(--gold-highlight);
      background: rgba(123,47,247,0.1);
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      padding: 0 24px 18px;
      color: var(--text-secondary);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    /* 联系表单 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .contact-form input, .contact-form textarea {
      width: 100%;
      background: var(--card-bg);
      border: 1px solid var(--border-dim);
      border-radius: var(--radius-sm);
      padding: 14px;
      color: white;
      margin-bottom: 16px;
    }
    .contact-form input:focus {
      border-color: #7B2FF7;
      box-shadow: 0 0 12px rgba(123,47,247,0.4);
    }
    .submit-btn {
      background: var(--gradient-main);
      width: 100%;
      padding: 16px;
      border-radius: var(--radius-md);
      font-weight: 700;
      color: white;
    }
    .footer {
      background: #0A0A14;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
      margin-bottom: 32px;
    }
    .footer a {
      color: var(--text-label);
      display: block;
      margin: 6px 0;
    }
    .footer a:hover {
      color: var(--gold-highlight);
    }
    @media (max-width: 1023px) {
      .hero-grid { grid-template-columns: 1fr; }
      .strength-grid { grid-template-columns: repeat(2,1fr); }
      .cases-masonry { columns: 2; }
      .compare-grid { grid-template-columns: 1fr; }
      .contact-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 767px) {
      .nav-links, .nav-cta { display: none; }
      .hamburger { display: block; }
      .strength-grid { grid-template-columns: 1fr; }
      .cases-masonry { columns: 1; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .hero-title { font-size: 2rem; }
    }