/* roulang page: index */
/* 设计变量与基础重置 */
    :root {
      --deep-space: #0B0F2A;
      --card-bg: #1A1F3A;
      --electric-cyan: #00E5FF;
      --accent-orange: #FF6D00;
      --text-soft: #B0C4DE;
      --white: #FFFFFF;
      --glass-bg: rgba(255, 255, 255, 0.03);
      --glass-border: rgba(0, 229, 255, 0.15);
      --glass-blur: blur(12px);
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.3);
      --shadow-glow: 0 0 20px rgba(0, 229, 255, 0.5), 0 4px 15px rgba(0, 0, 0, 0.4);
      --radius-card: 20px;
      --radius-btn: 50px;
      --radius-input: 12px;
      --font-sans: 'Inter', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      --transition-smooth: 0.3s cubic-bezier(0.23, 1, 0.32, 1);
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--deep-space);
      color: var(--text-soft);
      line-height: 1.7;
      overflow-x: hidden;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-smooth);
    }
    button {
      font-family: inherit;
      cursor: pointer;
      border: none;
      background: transparent;
      transition: var(--transition-smooth);
    }
    /* 容器与布局 */
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }
    section {
      padding: 6rem 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 4rem 0;
      }
    }
    /* 导航样式 - 沉浸式顶部导航 */
    .site-header {
      position: fixed;
      top: 0;
      width: 100%;
      z-index: 1000;
      background: transparent;
      transition: background 0.3s, backdrop-filter 0.3s, box-shadow 0.3s;
    }
    .site-header.scrolled {
      background: rgba(11, 15, 42, 0.8);
      backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(0, 229, 255, 0.1);
      box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 1rem 1.5rem;
      max-width: 1200px;
      margin: 0 auto;
    }
    .logo {
      font-size: 1.8rem;
      font-weight: 800;
      background: linear-gradient(90deg, var(--electric-cyan), var(--accent-orange));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: -0.02em;
      line-height: 1.2;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text-soft);
      position: relative;
      padding-bottom: 4px;
      font-size: 1rem;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 0;
      height: 2px;
      background: var(--electric-cyan);
      box-shadow: 0 0 8px var(--electric-cyan);
      transition: width 0.3s;
    }
    .nav-links a:hover {
      color: var(--electric-cyan);
    }
    .nav-links a:hover::after {
      width: 20px;
    }
    /* 移动端菜单按钮 */
    .menu-toggle {
      display: none;
      flex-direction: column;
      justify-content: space-between;
      width: 28px;
      height: 20px;
      background: transparent;
      border: none;
      cursor: pointer;
      z-index: 1100;
      position: relative;
    }
    .menu-toggle span {
      display: block;
      width: 100%;
      height: 2px;
      background: var(--white);
      transition: all 0.3s;
      border-radius: 4px;
    }
    .menu-toggle.active span:nth-child(1) {
      transform: translateY(9px) rotate(45deg);
    }
    .menu-toggle.active span:nth-child(2) {
      opacity: 0;
    }
    .menu-toggle.active span:nth-child(3) {
      transform: translateY(-9px) rotate(-45deg);
    }
    /* 移动端胶囊菜单面板 */
    .mobile-menu {
      position: fixed;
      top: 0;
      right: -100%;
      width: 80%;
      max-width: 360px;
      height: 100vh;
      background: rgba(11, 15, 42, 0.95);
      backdrop-filter: blur(30px);
      z-index: 1050;
      display: flex;
      flex-direction: column;
      padding: 6rem 2rem 2rem;
      transition: right 0.4s cubic-bezier(0.23, 1, 0.32, 1);
      gap: 1.2rem;
    }
    .mobile-menu.active {
      right: 0;
    }
    .mobile-menu a {
      display: block;
      padding: 1rem 1.5rem;
      background: var(--glass-bg);
      border: 1px solid var(--glass-border);
      border-radius: 30px;
      backdrop-filter: blur(12px);
      color: var(--white);
      font-weight: 500;
      text-align: center;
      transition: all 0.3s;
      box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    }
    .mobile-menu a:hover {
      border-color: var(--electric-cyan);
      box-shadow: 0 0 20px rgba(0,229,255,0.3);
      color: var(--electric-cyan);
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .menu-toggle {
        display: flex;
      }
    }
    /* Hero 区域 */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #0B0F2A 0%, #1A1F3A 100%);
      position: relative;
      overflow: hidden;
      padding-top: 5rem;
    }
    .hero::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.25;
      z-index: 0;
    }
    .hero .container {
      position: relative;
      z-index: 2;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }
    .hero-content {
      color: var(--white);
    }
    .hero h1 {
      font-size: clamp(2.8rem, 6vw, 4.5rem);
      font-weight: 800;
      letter-spacing: -0.02em;
      line-height: 1.15;
      background: linear-gradient(90deg, var(--electric-cyan), var(--accent-orange));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 1.5rem;
    }
    .hero-subtitle {
      font-size: 1.2rem;
      color: var(--text-soft);
      margin-bottom: 2.5rem;
      max-width: 90%;
    }
    .hero-actions {
      display: flex;
      gap: 1.2rem;
      flex-wrap: wrap;
    }
    .btn {
      display: inline-block;
      padding: 0.9rem 2.2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      letter-spacing: 0.03em;
      text-transform: uppercase;
      font-size: 1rem;
      transition: all 0.3s;
      text-align: center;
    }
    .btn-primary {
      background: var(--accent-orange);
      color: var(--white);
      box-shadow: var(--shadow-glow);
    }
    .btn-primary:hover {
      background: #ff7b1a;
      box-shadow: 0 0 30px rgba(255,109,0,0.7);
      transform: scale(1.05);
    }
    .btn-secondary {
      background: transparent;
      border: 1px solid var(--electric-cyan);
      color: var(--electric-cyan);
    }
    .btn-secondary:hover {
      background: rgba(0, 229, 255, 0.1);
      border-color: var(--accent-orange);
      color: var(--white);
    }
    .hero-image {
      display: flex;
      justify-content: center;
      align-items: center;
    }
    .hero-image img {
      max-width: 100%;
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
      border: 1px solid rgba(0,229,255,0.2);
    }
    @media (max-width: 768px) {
      .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-subtitle {
        max-width: 100%;
      }
      .hero-actions {
        flex-direction: column;
        align-items: center;
      }
      .btn {
        width: 100%;
        max-width: 280px;
      }
      .hero-image {
        order: -1;
        margin-bottom: 2rem;
      }
    }
    /* 痛点共鸣区 */
    .pain-points {
      background: linear-gradient(180deg, #0B0F2A 0%, #13183A 100%);
      text-align: center;
    }
    .pain-grid {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 2.5rem;
      margin-top: 3rem;
    }
    .pain-item {
      max-width: 280px;
    }
    .pain-item i {
      font-size: 2.2rem;
      color: var(--electric-cyan);
      margin-bottom: 1rem;
      opacity: 0.9;
    }
    .pain-item p {
      font-size: 1.1rem;
      font-weight: 500;
      color: var(--text-soft);
    }
    /* 解决方案卡片 */
    .solutions {
      background: var(--deep-space);
    }
    .section-title {
      font-size: clamp(2rem, 4vw, 2.8rem);
      font-weight: 700;
      letter-spacing: -0.01em;
      color: var(--white);
      margin-bottom: 1rem;
      text-align: center;
    }
    .section-subtitle {
      color: var(--text-soft);
      text-align: center;
      max-width: 600px;
      margin: 0 auto 3rem;
    }
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .solution-card {
      background: var(--glass-bg);
      border: 1px solid var(--glass-border);
      backdrop-filter: var(--glass-blur);
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
    }
    .solution-card:hover {
      transform: translateY(-8px);
      border-color: rgba(0, 229, 255, 0.5);
      box-shadow: 0 12px 40px rgba(0, 229, 255, 0.15);
    }
    .card-img {
      width: 100%;
      height: 180px;
      border-radius: 16px;
      object-fit: cover;
      margin-bottom: 1.5rem;
      border: 1px solid rgba(255,255,255,0.1);
    }
    .solution-card h3 {
      font-size: 1.4rem;
      font-weight: 600;
      color: var(--electric-cyan);
      margin-bottom: 0.8rem;
    }
    .solution-card p {
      color: var(--text-soft);
      margin-bottom: 1.2rem;
      flex-grow: 1;
    }
    .feature-list {
      list-style: none;
      padding: 0;
    }
    .feature-list li {
      display: flex;
      align-items: center;
      gap: 0.6rem;
      margin-bottom: 0.5rem;
      font-size: 0.95rem;
      color: #cbd5e0;
    }
    .feature-list li i {
      color: var(--accent-orange);
      font-size: 0.8rem;
    }
    @media (max-width: 768px) {
      .cards-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
        margin-left: auto;
        margin-right: auto;
      }
    }
    /* 成果展示区 */
    .results {
      background: #0B0F2A;
      background-image: linear-gradient(rgba(0,229,255,0.05) 1px, transparent 1px), linear-gradient(90deg, rgba(0,229,255,0.05) 1px, transparent 1px);
      background-size: 40px 40px;
    }
    .stats-grid {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 3rem;
      margin-top: 2.5rem;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 3.5rem;
      font-weight: 800;
      color: var(--accent-orange);
      text-shadow: 0 0 20px rgba(255,109,0,0.4);
      line-height: 1.2;
    }
    .stat-label {
      font-size: 1.1rem;
      letter-spacing: 0.05em;
      color: var(--text-soft);
    }
    /* 客户证言 */
    .testimonials {
      background: #0B0F2A;
    }
    .testimonial-scroll {
      display: flex;
      gap: 2rem;
      overflow-x: auto;
      scroll-snap-type: x mandatory;
      padding: 1rem 0 2rem;
      -webkit-overflow-scrolling: touch;
      scrollbar-width: none;
    }
    .testimonial-scroll::-webkit-scrollbar {
      display: none;
    }
    .testimonial-card {
      flex: 0 0 calc(33.333% - 1.4rem);
      min-width: 280px;
      background: var(--glass-bg);
      border: 1px solid var(--glass-border);
      backdrop-filter: var(--glass-blur);
      border-radius: var(--radius-card);
      padding: 2rem;
      scroll-snap-align: start;
      box-shadow: 0 4px 20px rgba(0,0,0,0.2);
    }
    .testimonial-header {
      display: flex;
      align-items: center;
      gap: 1rem;
      margin-bottom: 1.5rem;
    }
    .avatar-placeholder {
      width: 60px;
      height: 60px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--electric-cyan), var(--accent-orange));
      border: 2px solid var(--electric-cyan);
    }
    .testimonial-text {
      font-style: italic;
      color: #e2e8f0;
      margin-bottom: 1.5rem;
      line-height: 1.6;
    }
    .client-name {
      font-weight: 700;
      color: var(--accent-orange);
    }
    .client-role {
      font-size: 0.9rem;
      color: var(--text-soft);
    }
    @media (max-width: 768px) {
      .testimonial-card {
        flex: 0 0 85%;
      }
    }
    /* FAQ 手风琴 */
    .faq {
      background: #0B0F2A;
    }
    .faq-list {
      max-width: 800px;
      margin: 2rem auto 0;
    }
    .faq-item {
      border-bottom: 1px solid rgba(0, 229, 255, 0.1);
    }
    .faq-question {
      width: 100%;
      padding: 1.5rem 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: transparent;
      color: var(--white);
      font-weight: 600;
      font-size: 1.1rem;
      text-align: left;
      border: none;
      cursor: pointer;
      transition: background 0.2s;
    }
    .faq-question i {
      color: var(--electric-cyan);
      transition: transform 0.4s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.4s;
      color: var(--text-soft);
      padding: 0 0;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 1.5rem;
    }
    .faq-item.active .faq-question i {
      transform: rotate(45deg);
    }
    /* CTA 区域 */
    .cta-section {
      background: linear-gradient(135deg, #0B0F2A 0%, #1A1F3A 100%);
      position: relative;
      text-align: center;
      overflow: hidden;
    }
    .cta-section::before {
      content: '';
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(0,229,255,0.15) 0%, transparent 70%);
      z-index: 0;
    }
    .cta-content {
      position: relative;
      z-index: 1;
    }
    .cta-content h2 {
      font-size: 2.5rem;
      font-weight: 700;
      color: white;
      margin-bottom: 1rem;
    }
    .btn-large {
      padding: 1rem 3rem;
      font-size: 1.2rem;
      margin-top: 2rem;
    }
    /* 页脚 */
    .footer {
      background: #070B1F;
      padding: 3rem 0 1.5rem;
      color: var(--text-soft);
    }
    .footer-grid {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 2rem;
      margin-bottom: 2rem;
    }
    .footer-brand .logo {
      font-size: 1.8rem;
      margin-bottom: 0.8rem;
      display: inline-block;
    }
    .footer-bottom {
      border-top: 1px solid rgba(0,229,255,0.1);
      padding-top: 1.5rem;
      text-align: center;
      font-size: 0.9rem;
    }
    @media (max-width: 768px) {
      .footer-grid {
        flex-direction: column;
        text-align: center;
      }
    }
    /* 动画与可访问性 */
    @media (prefers-reduced-motion: reduce) {
      *,
      *::before,
      *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
      }
    }
    button:focus-visible, a:focus-visible {
      outline: 2px solid var(--electric-cyan);
      outline-offset: 2px;
    }