/* roulang page: index */
:root {
      --neon-cyan: #00F0FF;
      --warm-orange: #FF6B35;
      --bg-hero: #050505;
      --bg-nav: #0A0A0A;
      --bg-card: #0D0D0D;
      --bg-card-alt: #111111;
      --text-white: #FFFFFF;
      --text-h2: #FFFFFF;
      --text-h3: #E0E0E0;
      --text-body: #B0B0B0;
      --text-muted: #888888;
      --text-footer: #666666;
      --border-default: #1A1A1A;
      --border-hover: #333333;
      --border-glow: rgba(0,240,255,0.3);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --radius-pill: 50px;
      --shadow-glow: 0 0 12px rgba(0,240,255,0.3), 0 0 24px rgba(0,240,255,0.1);
      --shadow-card: 0 12px 28px rgba(0,240,255,0.08);
      --transition-smooth: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Inter", "SF Pro Display", system-ui, sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-hero);
      color: var(--text-body);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

    a {
      color: var(--neon-cyan);
      text-decoration: none;
      transition: var(--transition-smooth);
    }

    a:hover {
      color: var(--neon-cyan);
      text-decoration: none;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    @media (max-width: 768px) {
      .container {
        padding: 0 16px;
      }
    }

    /* 霓虹文字Logo */
    .logo-text {
      font-weight: 600;
      font-size: 1.25rem;
      letter-spacing: 0.08em;
      color: var(--text-white);
      display: flex;
      align-items: center;
    }
    .logo-text span {
      background: linear-gradient(135deg, var(--neon-cyan) 0%, #00c8d4 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    /* 导航 */
    .kaiwing-nav {
      background: var(--bg-nav);
      height: 72px;
      position: sticky;
      top: 0;
      z-index: 1000;
      border-bottom: 1px solid rgba(0,240,255,0.4);
      box-shadow: 0 0 8px rgba(0,240,255,0.2);
      display: flex;
      align-items: center;
    }

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

    .nav-links {
      display: flex;
      gap: 2rem;
      list-style: none;
    }

    .nav-links a {
      color: #B0B0B0;
      font-weight: 500;
      font-size: 0.95rem;
      padding: 0.25rem 0;
      position: relative;
      transition: var(--transition-smooth);
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--neon-cyan);
      box-shadow: 0 0 8px var(--neon-cyan);
      transition: width 0.3s ease;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--neon-cyan);
    }

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

    .nav-cta {
      border: 1px solid var(--neon-cyan);
      color: var(--neon-cyan);
      background: transparent;
      padding: 0.5rem 1.5rem;
      border-radius: var(--radius-pill);
      font-weight: 600;
      transition: var(--transition-smooth);
      cursor: pointer;
    }

    .nav-cta:hover {
      background: var(--neon-cyan);
      color: #0A0A0A;
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 1.8rem;
      cursor: pointer;
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: rgba(10,10,10,0.95);
        flex-direction: column;
        padding: 2rem;
        gap: 1.5rem;
        backdrop-filter: blur(8px);
      }
      .nav-links.show {
        display: flex;
      }
      .menu-toggle {
        display: block;
      }
    }

    /* Hero双栏 */
    .hero-section {
      background: var(--bg-hero);
      min-height: 90vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 60% 40%;
      gap: 2rem;
      align-items: center;
    }

    .hero-left {
      animation: fadeInUp 0.8s ease 0.2s both;
    }

    .hero-left h1 {
      font-size: clamp(2.5rem, 5vw, 4rem);
      font-weight: 700;
      line-height: 1.15;
      color: var(--text-white);
      letter-spacing: -0.02em;
    }

    .hero-sub {
      font-size: 1.15rem;
      color: #909090;
      max-width: 520px;
      margin-top: 24px;
      margin-bottom: 32px;
    }

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

    .btn-primary {
      background: var(--neon-cyan);
      color: #0A0A0A;
      border: none;
      padding: 0.85rem 2.2rem;
      border-radius: var(--radius-pill);
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition-smooth);
      box-shadow: 0 0 12px rgba(0,240,255,0.25);
    }

    .btn-primary:hover {
      background: #33F5FF;
      box-shadow: 0 0 24px rgba(0,240,255,0.4);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid #333;
      color: #CCC;
      padding: 0.85rem 2.2rem;
      border-radius: var(--radius-pill);
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition-smooth);
    }

    .btn-outline:hover {
      border-color: var(--neon-cyan);
      color: var(--neon-cyan);
    }

    .hero-right {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: var(--radius-lg);
      height: 420px;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .hero-right::after {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(5,5,5,0.45);
      border-radius: var(--radius-lg);
    }

    .geo-lines {
      position: relative;
      z-index: 2;
      width: 100px;
      height: 100px;
      border: 2px solid rgba(0,240,255,0.5);
      border-radius: 50%;
      box-shadow: 0 0 18px rgba(0,240,255,0.3);
      animation: pulse 3s infinite;
    }

    @keyframes pulse {
      0% { transform: scale(1); opacity: 0.7; }
      50% { transform: scale(1.05); opacity: 1; }
      100% { transform: scale(1); opacity: 0.7; }
    }

    @keyframes fadeInUp {
      from { opacity: 0; transform: translateY(20px); }
      to { opacity: 1; transform: translateY(0); }
    }

    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .hero-right {
        height: 280px;
        margin-top: 2rem;
      }
    }

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

    .section-title {
      text-align: center;
      font-size: 2rem;
      font-weight: 600;
      color: var(--text-h2);
      margin-bottom: 0.75rem;
    }

    .title-underline {
      width: 60px;
      height: 3px;
      background: var(--neon-cyan);
      margin: 0 auto 48px;
      box-shadow: 0 0 8px var(--neon-cyan);
    }

    /* 核心优势 */
    .advantages {
      background: var(--bg-nav);
    }

    .adv-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .adv-card {
      background: var(--bg-card-alt);
      border: 1px solid var(--border-default);
      border-radius: var(--radius-md);
      padding: 32px;
      transition: var(--transition-smooth);
    }

    .adv-card:hover {
      border-color: var(--neon-cyan);
      transform: translateY(-4px);
      box-shadow: var(--shadow-card);
    }

    .adv-icon {
      font-size: 2.2rem;
      color: var(--neon-cyan);
      margin-bottom: 16px;
    }

    .adv-card h3 {
      font-size: 1.25rem;
      color: var(--text-h3);
      margin-bottom: 12px;
    }

    .adv-desc {
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 案例瀑布流 */
    .cases-bg {
      background: var(--bg-hero);
    }

    .case-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

    .case-card {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      overflow: hidden;
      transition: var(--transition-smooth);
      border: 1px solid var(--border-default);
    }

    .case-card:hover {
      border-color: var(--border-glow);
      box-shadow: var(--shadow-card);
    }

    .case-img {
      height: 240px;
      background-size: cover;
      background-position: center;
      position: relative;
    }

    .case-img::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      height: 60%;
      background: linear-gradient(to top, rgba(0,0,0,0.7), transparent);
    }

    .case-content {
      padding: 24px;
    }

    .case-tag {
      font-size: 0.7rem;
      border: 1px solid var(--neon-cyan);
      color: var(--neon-cyan);
      padding: 0.15rem 0.8rem;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 12px;
      text-transform: uppercase;
    }

    .case-card h3 {
      color: var(--text-white);
      font-size: 1.1rem;
      margin-bottom: 8px;
    }

    .case-summary {
      color: #777;
      font-size: 0.85rem;
      display: -webkit-box;
      -webkit-line-clamp: 2;
      -webkit-box-orient: vertical;
      overflow: hidden;
    }

    @media (max-width: 640px) {
      .case-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 方案对比 */
    .pricing {
      background: var(--bg-nav);
    }

    .price-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .price-card {
      background: #0F0F0F;
      border: 1px solid var(--border-default);
      border-radius: var(--radius-md);
      padding: 32px;
      position: relative;
      transition: var(--transition-smooth);
    }

    .price-card.featured {
      border-color: rgba(0,240,255,0.4);
      box-shadow: 0 0 20px rgba(0,240,255,0.1);
    }

    .badge-hot {
      background: var(--neon-cyan);
      color: #0A0A0A;
      font-size: 0.7rem;
      font-weight: bold;
      padding: 0.2rem 0.8rem;
      border-radius: 20px;
      position: absolute;
      top: 16px;
      right: 16px;
    }

    .price-amount {
      font-size: 2rem;
      color: var(--text-white);
      font-weight: 700;
    }

    .price-period {
      font-size: 0.8rem;
      color: #666;
    }

    .feature-list {
      list-style: none;
      margin-top: 24px;
    }

    .feature-list li {
      color: #AAA;
      margin-bottom: 14px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .feature-list i {
      color: var(--neon-cyan);
    }

    @media (max-width: 1024px) {
      .price-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin: 0 auto;
      }
    }

    /* FAQ */
    .faq-section {
      background: var(--bg-hero);
    }

    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-default);
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      overflow: hidden;
    }

    .faq-question {
      padding: 20px 24px;
      color: #E0E0E0;
      font-weight: 500;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      transition: var(--transition-smooth);
    }

    .faq-answer {
      padding: 0 24px;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      color: var(--text-muted);
    }

    .faq-item.active {
      border-color: rgba(0,240,255,0.3);
    }

    .faq-item.active .faq-answer {
      padding-bottom: 20px;
      max-height: 200px;
    }

    /* CTA 联系 */
    .cta-section {
      background: var(--bg-hero);
      text-align: center;
    }

    .cta-title {
      font-size: 2.5rem;
      color: var(--text-white);
    }

    .cta-sub {
      color: #888;
      margin: 16px 0 32px;
    }

    .contact-form {
      display: flex;
      gap: 12px;
      justify-content: center;
      flex-wrap: wrap;
      margin-top: 24px;
    }

    .contact-form input {
      background: #111;
      border: 1px solid #222;
      color: white;
      padding: 12px 16px;
      border-radius: var(--radius-sm);
      min-width: 260px;
    }

    .contact-form input:focus {
      border-color: var(--neon-cyan);
      outline: none;
    }

    /* 页脚 */
    .footer {
      background: var(--bg-nav);
      border-top: 1px solid var(--border-default);
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }

    .footer-brand p {
      color: #888;
      margin-top: 12px;
    }

    .footer-links h4 {
      color: var(--text-white);
      margin-bottom: 12px;
    }

    .footer-links a {
      display: block;
      color: #777;
      margin-bottom: 8px;
    }

    .copyright {
      text-align: center;
      color: #666;
      font-size: 0.8rem;
      margin-top: 40px;
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .section {
        padding: 60px 0;
      }
      .adv-grid {
        grid-template-columns: 1fr;
      }
    }