/* roulang page: index */
:root {
      --primary: #1A1A2E;
      --accent: #7B2FBE;
      --highlight: #00E676;
      --bg: #F5F3F7;
      --card-bg: #FFFFFF;
      --text-primary: #0D0D1A;
      --text-heading: #1A1A2E;
      --text-body: #3D3D5C;
      --text-muted: #7A7A9E;
      --border-light: rgba(26,26,46,0.06);
      --shadow-sm: 0 2px 16px rgba(26,26,46,0.06);
      --shadow-hover: 0 8px 32px rgba(123,47,190,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --max-width: 1200px;
      --nav-height: 72px;
      --nav-height-mobile: 60px;
      --transition-base: 0.25s ease;
    }

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

    body {
      font-family: 'Inter', 'Noto Sans SC', sans-serif;
      font-weight: 400;
      line-height: 1.7;
      color: var(--text-body);
      background-color: var(--bg);
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      overflow-x: hidden;
    }

    h1, h2, h3, h4, .logo, .nav-link, .btn, .stat-number {
      font-family: 'Noto Sans SC', 'Inter', sans-serif;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* 排版 */
    h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      color: #FFFFFF;
    }
    h2 {
      font-size: 36px;
      font-weight: 600;
      color: var(--text-heading);
      margin-bottom: 16px;
    }
    h3 {
      font-size: 24px;
      font-weight: 600;
      color: var(--text-primary);
    }
    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }
    .section-title h2 {
      position: relative;
      display: inline-block;
    }
    .section-title h2::after {
      content: '';
      position: absolute;
      left: 50%;
      bottom: -12px;
      transform: translateX(-50%);
      width: 50px;
      height: 3px;
      background: var(--accent);
      border-radius: 3px;
    }

    /* 按钮 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      text-decoration: none;
      cursor: pointer;
      transition: all var(--transition-base);
      border: 1.5px solid transparent;
      white-space: nowrap;
      gap: 8px;
    }
    .btn-primary {
      background: var(--accent);
      color: #fff;
      border-color: var(--accent);
      box-shadow: 0 4px 12px rgba(123,47,190,0.3);
    }
    .btn-primary:hover {
      background: #6A28A8;
      border-color: #6A28A8;
      box-shadow: 0 6px 18px rgba(123,47,190,0.4);
      transform: translateY(-1px);
    }
    .btn-secondary {
      background: transparent;
      color: var(--primary);
      border-color: var(--primary);
    }
    .btn-secondary:hover {
      background: rgba(26,26,46,0.05);
      border-color: var(--primary);
    }
    .btn-outline-light {
      background: transparent;
      color: #fff;
      border-color: rgba(255,255,255,0.7);
    }
    .btn-outline-light:hover {
      background: rgba(255,255,255,0.1);
      border-color: #fff;
    }
    .btn-light {
      background: #fff;
      color: var(--accent);
      border-color: #fff;
    }
    .btn-light:hover {
      background: #f0f0f0;
      border-color: #f0f0f0;
    }
    .btn-text {
      background: transparent;
      color: var(--accent);
      border: none;
      padding: 8px 0;
      text-decoration: underline;
      text-underline-offset: 4px;
    }
    .btn-text:hover {
      text-decoration-thickness: 2px;
    }
    .btn:focus-visible {
      outline: 2px solid var(--accent);
      outline-offset: 2px;
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      height: var(--nav-height);
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255,255,255,0.15);
      box-shadow: 0 4px 24px rgba(0,0,0,0.06);
      transition: background 0.3s, box-shadow 0.3s;
    }
    .header.scrolled {
      background: rgba(26,26,46,0.94);
      box-shadow: 0 6px 28px rgba(0,0,0,0.15);
    }
    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
    }
    .logo {
      font-size: 22px;
      font-weight: 700;
      background: linear-gradient(135deg, var(--accent), var(--highlight));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      text-decoration: none;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-link {
      color: #fff;
      text-decoration: none;
      font-weight: 500;
      font-size: 15px;
      transition: color var(--transition-base);
    }
    .nav-link:hover {
      color: var(--accent);
    }
    .header.scrolled .nav-link {
      color: rgba(255,255,255,0.9);
    }
    .header.scrolled .nav-link:hover {
      color: var(--accent);
    }
    .nav-cta {
      margin-left: 16px;
    }
    .burger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
    }
    .burger span {
      width: 24px;
      height: 2px;
      background: #fff;
      border-radius: 2px;
      transition: 0.3s;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      right: 0;
      width: 80%;
      max-width: 400px;
      height: 100vh;
      background: var(--primary);
      padding: 24px;
      z-index: 999;
      transform: translateX(100%);
      transition: transform 0.3s ease;
      flex-direction: column;
      gap: 28px;
    }
    .mobile-menu.active {
      transform: translateX(0);
    }
    .mobile-menu .nav-link {
      font-size: 18px;
      padding-left: 12px;
      border-left: 3px solid transparent;
    }
    .mobile-menu .nav-link:hover {
      border-left-color: var(--accent);
      color: #fff;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #1A1A2E 0%, #16213E 100%);
      position: relative;
      overflow: hidden;
      padding-top: var(--nav-height);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 60% 40%;
      gap: 40px;
      align-items: center;
    }
    .hero-left {
      z-index: 2;
    }
    .hero h1 {
      margin-bottom: 20px;
    }
    .hero h1 span {
      color: var(--accent);
    }
    .hero-sub {
      font-size: 18px;
      color: rgba(255,255,255,0.7);
      max-width: 520px;
      margin-bottom: 32px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }
    .trust-badges {
      display: flex;
      gap: 24px;
      align-items: center;
      flex-wrap: wrap;
    }
    .trust-badge {
      color: rgba(255,255,255,0.6);
      font-weight: 500;
      font-size: 14px;
      transition: color 0.3s;
      letter-spacing: 0.5px;
    }
    .trust-badge:hover {
      color: #fff;
    }
    .hero-right {
      position: relative;
      display: flex;
      justify-content: center;
      align-items: center;
    }
    .geo-art {
      width: 320px;
      height: 320px;
      position: relative;
      animation: float 4s ease-in-out infinite;
    }
    .geo-ring {
      position: absolute;
      border-radius: 50%;
      border: 3px solid rgba(123,47,190,0.4);
      width: 100%;
      height: 100%;
      top: 0;
      left: 0;
      animation: rotate 20s linear infinite;
    }
    .geo-triangle {
      position: absolute;
      width: 120px;
      height: 120px;
      background: rgba(0,230,118,0.15);
      clip-path: polygon(50% 0%, 0% 100%, 100% 100%);
      top: 60px;
      left: 100px;
      animation: rotate 25s linear infinite reverse;
    }
    .data-card-float {
      position: absolute;
      background: rgba(255,255,255,0.1);
      backdrop-filter: blur(12px);
      padding: 16px 20px;
      border-radius: 12px;
      color: #fff;
      bottom: 40px;
      right: 10px;
      border: 1px solid rgba(255,255,255,0.2);
    }
    .pulse-dot {
      width: 8px;
      height: 8px;
      background: var(--highlight);
      border-radius: 50%;
      display: inline-block;
      margin-right: 6px;
      animation: pulse 1.5s infinite;
    }
    @keyframes rotate { 100% { transform: rotate(360deg); } }
    @keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }
    @keyframes pulse { 0% { box-shadow: 0 0 0 0 rgba(0,230,118,0.7); } 70% { box-shadow: 0 0 0 10px rgba(0,230,118,0); } 100% { box-shadow: 0 0 0 0 rgba(0,230,118,0); } }

    .scroll-indicator {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      color: rgba(255,255,255,0.6);
      animation: bounce 2s infinite;
    }
    @keyframes bounce { 0%,100%{transform:translateY(0);} 50%{transform:translateY(8px);} }

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

    /* 亮点网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .feature-card {
      background: var(--card-bg);
      padding: 32px;
      border-radius: var(--radius-card);
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      transition: all var(--transition-base);
      border-left: 3px solid transparent;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-left-color: var(--accent);
    }
    .feature-icon {
      font-size: 40px;
      color: var(--accent);
      margin-bottom: 16px;
      transition: transform 0.3s;
    }
    .feature-card:hover .feature-icon {
      transform: rotate(5deg);
    }
    .feature-card h3 {
      margin-bottom: 8px;
    }
    .feature-card p {
      color: var(--text-body);
    }

    /* 方案对比 */
    .plans-row {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      align-items: start;
    }
    .plan-card {
      background: var(--card-bg);
      padding: 32px;
      border-radius: var(--radius-card);
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      text-align: center;
      position: relative;
      transition: all var(--transition-base);
    }
    .plan-card.featured {
      transform: translateY(-8px);
      border-color: var(--accent);
      box-shadow: var(--shadow-hover);
    }
    .plan-badge {
      position: absolute;
      top: 16px;
      right: 16px;
      background: var(--accent);
      color: #fff;
      padding: 4px 12px;
      border-radius: 4px;
      font-size: 12px;
      font-weight: 600;
    }
    .plan-price {
      font-size: 48px;
      font-weight: 700;
      color: var(--highlight);
      font-family: 'Inter', sans-serif;
    }
    .plan-unit {
      font-size: 14px;
      color: var(--text-muted);
    }
    .plan-features {
      list-style: none;
      text-align: left;
      margin: 24px 0;
    }
    .plan-features li {
      padding: 8px 0;
      display: flex;
      align-items: center;
      gap: 10px;
      color: var(--text-body);
    }
    .plan-features i.fa-check {
      color: var(--highlight);
    }
    .plan-features i.fa-times {
      color: #ccc;
    }

    /* 案例瀑布流 */
    .masonry {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      grid-auto-rows: masonry;
    }
    .case-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      overflow: hidden;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      transition: all var(--transition-base);
      break-inside: avoid;
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      position: relative;
      overflow: hidden;
      aspect-ratio: 4/3;
      background: #e0e0e0;
    }
    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.3s;
    }
    .case-card:hover .case-img img {
      transform: scale(1.03);
    }
    .case-overlay {
      position: absolute;
      inset: 0;
      background: rgba(123,47,190,0.85);
      display: flex;
      align-items: center;
      justify-content: center;
      opacity: 0;
      transition: opacity 0.3s;
    }
    .case-card:hover .case-overlay {
      opacity: 1;
    }
    .case-tag {
      position: absolute;
      top: 16px;
      left: 16px;
      background: rgba(0,0,0,0.6);
      color: #fff;
      padding: 4px 10px;
      border-radius: 4px;
      font-size: 12px;
    }
    .case-body {
      padding: 20px;
    }
    .case-stats {
      display: flex;
      gap: 16px;
      margin-top: 12px;
    }
    .stat-number {
      font-weight: 700;
      color: var(--highlight);
      font-family: 'Inter', sans-serif;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      margin-bottom: 12px;
      border: 1px solid var(--border-light);
      overflow: hidden;
    }
    .faq-question {
      padding: 20px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 500;
      background: var(--card-bg);
      transition: background var(--transition-base);
    }
    .faq-question:hover {
      background: #f9f7fc;
    }
    .faq-icon {
      color: var(--accent);
      transition: transform 0.3s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      background: #F9F7FC;
      padding: 0 20px;
      border-left: 3px solid var(--accent);
      margin-left: 20px;
      color: var(--text-body);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 20px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* CTA 横幅 */
    .cta-band {
      background: linear-gradient(135deg, #1A1A2E 0%, #7B2FBE 100%);
      text-align: center;
      padding: 80px 24px;
      color: #fff;
    }

    /* 页脚 */
    .footer {
      background: #0D0D1A;
      color: rgba(255,255,255,0.6);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer a {
      color: #fff;
      text-decoration: none;
      transition: color 0.3s;
    }
    .footer a:hover {
      color: var(--accent);
    }
    .footer h4 {
      color: #fff;
      margin-bottom: 16px;
    }

    @media (max-width: 992px) {
      .nav-links { display: none; }
      .burger { display: flex; }
      .mobile-menu { display: flex; }
      .hero-grid { grid-template-columns: 1fr; }
      .hero-right { order: -1; margin-bottom: 20px; }
      .features-grid { grid-template-columns: repeat(2,1fr); }
      .plans-row { grid-template-columns: repeat(2,1fr); }
      .masonry { grid-template-columns: repeat(2,1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      h1 { font-size: 32px; } h2 { font-size: 26px; }
      .features-grid, .plans-row, .masonry { grid-template-columns: 1fr; }
      .hero-right .geo-art { width: 200px; height: 200px; }
      .footer-grid { grid-template-columns: 1fr; }
    }