/* roulang page: index */
:root {
      --primary-deep: #0A0E17;
      --accent-cyan: #00F0FF;
      --accent-cyan-hover: #00D0DD;
      --bg-light: #F4F5F7;
      --text-primary: #1A1D26;
      --text-secondary: #6B7280;
      --text-light: #9CA3AF;
      --border-light: #E5E7EB;
      --white: #FFFFFF;
      --font-display: 'DIN Next LT Pro', 'Roboto Condensed', 'Teko', sans-serif;
      --font-body: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --container-max: 1280px;
      --section-padding-y: 120px;
      --section-padding-y-mobile: 80px;
      --nav-height: 80px;
      --border-radius: 2px;
      --shadow-subtle: 0 1px 2px rgba(0,0,0,0.04);
      --transition-smooth: 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--bg-light);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      overflow-x: hidden;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 2rem;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

    button, input {
      font-family: var(--font-body);
      border: none;
      outline: none;
      background: transparent;
    }

    /* 导航栏：搜索主导风格 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(244, 245, 247, 0.88);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      z-index: 100;
      border-bottom: 1px solid var(--border-light);
      display: flex;
      align-items: center;
      transition: background 0.3s;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 2rem;
      gap: 1.5rem;
    }

    .logo {
      font-family: var(--font-display);
      font-weight: 800;
      font-size: 1.8rem;
      letter-spacing: -0.5px;
      color: var(--primary-deep);
      white-space: nowrap;
      transition: color 0.2s;
    }
    .logo span {
      color: var(--accent-cyan);
    }

    .nav-search-wrapper {
      flex: 1;
      max-width: 380px;
      min-width: 200px;
      position: relative;
      margin: 0 auto;
    }

    .nav-search-icon {
      position: absolute;
      left: 16px;
      top: 50%;
      transform: translateY(-50%);
      color: var(--accent-cyan);
      font-size: 1.2rem;
      pointer-events: none;
    }

    .nav-search-input {
      width: 100%;
      padding: 0.75rem 1.2rem 0.75rem 2.8rem;
      border: 1px solid var(--border-light);
      border-radius: var(--border-radius);
      background: var(--white);
      font-size: 0.95rem;
      color: var(--text-primary);
      transition: all var(--transition-smooth);
      font-family: var(--font-body);
    }

    .nav-search-input:focus {
      border-color: var(--accent-cyan);
      box-shadow: 0 0 0 3px rgba(0, 240, 255, 0.15);
      outline: none;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 2.4rem;
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-primary);
      white-space: nowrap;
    }

    .nav-links a {
      position: relative;
      padding: 0.3rem 0;
      transition: color 0.2s;
      font-family: var(--font-body);
      letter-spacing: 0.3px;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-cyan);
      transition: width var(--transition-smooth);
    }

    .nav-links a:hover {
      color: var(--accent-cyan);
    }
    .nav-links a:hover::after {
      width: 100%;
    }

    .menu-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      padding: 8px;
      background: transparent;
    }
    .menu-toggle span {
      width: 24px;
      height: 2px;
      background: var(--primary-deep);
      transition: 0.2s;
    }

    /* 通用板块样式 */
    .section {
      padding: var(--section-padding-y) 0;
    }

    .section-title {
      font-family: var(--font-display);
      font-size: clamp(2.2rem, 6vw, 3.5rem);
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      margin-bottom: 1rem;
      color: var(--primary-deep);
      text-transform: uppercase;
    }

    .section-sub {
      font-size: 1.125rem;
      color: var(--text-secondary);
      max-width: 700px;
    }

    /* Hero 首屏 */
    #hero {
      padding-top: calc(var(--nav-height) + 2.5rem);
      padding-bottom: var(--section-padding-y);
      display: flex;
      align-items: center;
      min-height: 100vh;
      background: var(--bg-light);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }

    .hero-content h1 {
      font-family: var(--font-display);
      font-size: clamp(3rem, 8vw, 5.5rem);
      font-weight: 900;
      line-height: 1.1;
      color: var(--primary-deep);
      letter-spacing: -1px;
    }
    .hero-content h1 .strike {
      text-decoration: line-through;
      color: var(--text-secondary);
      font-weight: 700;
    }
    .hero-content h1 .highlight {
      color: var(--accent-cyan);
      border-bottom: 4px solid var(--accent-cyan);
      display: inline-block;
    }
    .hero-desc {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin: 1.8rem 0 2.2rem;
      max-width: 90%;
    }

    .btn-primary {
      background: var(--accent-cyan);
      color: var(--primary-deep);
      font-family: var(--font-display);
      font-weight: 700;
      font-size: 1.1rem;
      padding: 0.9rem 2.8rem;
      border-radius: var(--border-radius);
      display: inline-block;
      letter-spacing: 0.5px;
      transition: all var(--transition-smooth);
      border: 2px solid transparent;
      cursor: pointer;
      text-transform: uppercase;
    }
    .btn-primary:hover {
      background: var(--accent-cyan-hover);
      box-shadow: 0 0 22px rgba(0, 240, 255, 0.5);
      transform: translateY(-2px);
      border-color: var(--accent-cyan);
    }

    .hero-visual {
      background: linear-gradient(135deg, #0A0E17 0%, #1F2A3A 100%);
      border-radius: 2px;
      height: 420px;
      width: 100%;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      overflow: hidden;
      border: 1px solid rgba(0,240,255,0.2);
    }
    .dynamic-shape {
      width: 180px;
      height: 180px;
      border: 2px solid var(--accent-cyan);
      border-radius: 50%;
      opacity: 0.7;
      animation: pulseShape 4s infinite alternate;
    }
    @keyframes pulseShape {
      0% { transform: scale(0.9); opacity: 0.5; border-color: #00F0FF; }
      100% { transform: scale(1.2); opacity: 0.9; border-color: #0A0E17; }
    }

    /* 解决方案：左右交替 */
    #solution .solution-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
      margin-bottom: 5rem;
    }
    #solution .solution-row:last-child {
      margin-bottom: 0;
    }
    .solution-text {
      position: relative;
    }
    .solution-number {
      font-family: var(--font-display);
      font-size: 6rem;
      font-weight: 900;
      color: rgba(0, 240, 255, 0.08);
      position: absolute;
      top: -30px;
      left: -20px;
      line-height: 1;
      z-index: 0;
    }
    .solution-text h3 {
      font-family: var(--font-display);
      font-size: 2rem;
      font-weight: 700;
      position: relative;
      z-index: 1;
    }
    .solution-img {
      background-size: cover;
      background-position: center;
      height: 320px;
      border-radius: 2px;
      transition: transform 0.4s ease;
      border: 1px solid var(--border-light);
    }
    .solution-img:hover {
      transform: scale(1.03);
    }

    /* 成果数据 */
    #result .metrics {
      display: flex;
      flex-wrap: wrap;
      justify-content: space-around;
      text-align: center;
      gap: 3rem;
      margin-top: 3rem;
    }
    .metric-value {
      font-family: var(--font-display);
      font-size: 5rem;
      font-weight: 900;
      color: var(--accent-cyan);
      line-height: 1;
    }
    .metric-label {
      font-size: 1rem;
      color: var(--text-secondary);
      letter-spacing: 0.5px;
      margin-top: 0.5rem;
    }

    /* 客户证言 */
    #testimonials .quote-block {
      display: flex;
      gap: 2.5rem;
      align-items: center;
      margin-bottom: 3rem;
      padding: 1.5rem 0;
      border-bottom: 1px solid var(--border-light);
    }
    .quote-avatar {
      width: 70px;
      height: 70px;
      border-radius: 2px;
      background-size: cover;
      background-position: center;
      flex-shrink: 0;
      border: 1px solid var(--border-light);
    }
    .quote-text {
      font-size: 1.5rem;
      font-style: italic;
      font-weight: 400;
      color: var(--primary-deep);
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 1.5rem 0;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      font-size: 1.2rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-secondary);
    }

    /* CTA */
    #contact {
      background: var(--primary-deep);
      color: white;
    }
    .contact-form {
      display: flex;
      max-width: 500px;
      margin-top: 2rem;
      border-bottom: 2px solid var(--accent-cyan);
    }
    .contact-form input {
      flex:1;
      background: transparent;
      padding: 0.8rem 0;
      color: white;
      font-size: 1rem;
    }
    
    footer {
      background: var(--primary-deep);
      color: var(--text-light);
      padding: 2rem 0;
      text-align: center;
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .menu-toggle { display: flex; }
      .hero-grid, .solution-row { grid-template-columns: 1fr; }
      .solution-img { height: 250px; }
    }