/* roulang page: index */
:root {
      --deep-blue-black: #0A0E27;
      --card-dark: #1A1F3A;
      --blaze-red: #FF4655;
      --blaze-red-light: #FF6B7A;
      --cyan-electric: #00E5FF;
      --gold-glory: #FFD700;
      --light-gray-bg: #F4F6F9;
      --white: #FFFFFF;
      --text-secondary: #8A8FA6;
      --text-light: #B0B5CC;
      --border-light: rgba(0, 229, 255, 0.15);
      --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.08);
      --shadow-hover: 0 8px 40px rgba(0, 229, 255, 0.15);
      --radius-card: 16px;
      --radius-btn: 8px;
      --container-max: 1200px;
      --section-gap: 120px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      --transition-smooth: all 0.25s ease;
      --header-height: 72px;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--white);
      color: #1E2235;
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(10, 14, 39, 0.88);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0, 229, 255, 0.15);
      transition: background 0.3s ease, box-shadow 0.3s ease;
      height: var(--header-height);
    }
    
    .header.scrolled {
      background: rgba(10, 14, 39, 0.96);
      box-shadow: 0 4px 20px rgba(0,0,0,0.4);
    }
    
    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    
    .logo {
      font-size: 1.8rem;
      font-weight: 800;
      letter-spacing: 1px;
      color: var(--white);
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 4px;
    }
    .logo i {
      color: var(--cyan-electric);
      font-size: 2rem;
    }
    .logo span {
      background: linear-gradient(135deg, #fff 0%, #e0f0ff 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-links a {
      color: var(--text-light);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.2s;
      position: relative;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--cyan-electric);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--cyan-electric);
      border-radius: 2px;
    }
    
    .btn-primary {
      background: linear-gradient(135deg, var(--blaze-red) 0%, var(--blaze-red-light) 100%);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: var(--transition-smooth);
      border: none;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      box-shadow: 0 4px 14px rgba(255,70,85,0.35);
      letter-spacing: 0.3px;
    }
    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 22px rgba(255,70,85,0.5);
    }
    
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--cyan-electric);
      color: var(--cyan-electric);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: var(--transition-smooth);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-outline:hover {
      background: rgba(0, 229, 255, 0.08);
      border-color: #80f0ff;
      color: #80f0ff;
      box-shadow: 0 0 15px rgba(0,229,255,0.3);
    }
    
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
    }
    .hamburger span {
      width: 26px;
      height: 2px;
      background: var(--white);
      transition: 0.3s;
      border-radius: 2px;
    }
    
    /* Hero */
    .hero {
      background: linear-gradient(135deg, #0A0E27 0%, #1A1F3A 50%, #0F1333 100%);
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      padding-top: var(--header-height);
    }
    .hero::before {
      content: '';
      position: absolute;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(0,229,255,0.15) 0%, transparent 70%);
      top: -100px;
      right: -100px;
    }
    .hero .container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
      position: relative;
      z-index: 2;
    }
    .hero-content h1 {
      font-size: 48px;
      font-weight: 900;
      line-height: 1.2;
      color: white;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
    }
    .hero-content h1 .highlight {
      background: linear-gradient(to right, #FF4655, #FFD700);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-light);
      margin-bottom: 32px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-visual {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: 32px;
      height: 400px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
      position: relative;
    }
    .hero-visual::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(255,70,85,0.15) 0%, rgba(0,229,255,0.2) 100%);
      border-radius: 32px;
    }
    
    /* 公用板块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 36px;
      font-weight: 700;
      text-align: center;
      margin-bottom: 16px;
      color: #0A0E27;
    }
    .section-sub {
      text-align: center;
      color: #5A5F7A;
      max-width: 600px;
      margin: 0 auto 48px;
    }
    
    /* 痛点 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .pain-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-card);
      border-left: 4px solid var(--blaze-red);
      display: flex;
      gap: 16px;
      align-items: flex-start;
      transition: var(--transition-smooth);
    }
    .pain-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .pain-icon {
      font-size: 2rem;
      color: var(--cyan-electric);
    }
    
    /* 解决方案卡片 */
    .solutions-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .solution-card {
      background: var(--card-dark);
      border-radius: var(--radius-card);
      padding: 0;
      overflow: hidden;
      transition: var(--transition-smooth);
      color: white;
      border: 1px solid transparent;
    }
    .solution-card:hover {
      transform: translateY(-8px);
      border-color: rgba(0,229,255,0.4);
      box-shadow: 0 12px 32px rgba(0,229,255,0.25);
    }
    .card-cover {
      height: 160px;
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .card-cover::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(0deg, rgba(10,14,39,0.8) 0%, transparent 70%);
    }
    .card-body {
      padding: 24px;
    }
    .card-body i {
      font-size: 2rem;
      color: var(--cyan-electric);
      margin-bottom: 12px;
    }
    .card-body h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 8px;
    }
    
    /* 数据徽章 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
    }
    .stat-badge {
      background: radial-gradient(circle at 30% 30%, #1A1F3A, #0A0E27);
      border-radius: 24px;
      padding: 32px 16px;
      text-align: center;
      color: white;
      box-shadow: 0 8px 20px rgba(0,0,0,0.3);
    }
    .stat-number {
      font-size: 48px;
      font-weight: 900;
      color: var(--gold-glory);
    }
    
    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .testimonial-card {
      background: white;
      border-radius: 16px;
      padding: 28px;
      box-shadow: var(--shadow-card);
      border-left: 5px solid var(--blaze-red);
    }
    .stars {
      color: var(--gold-glory);
      margin-bottom: 12px;
    }
    
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid #e0e4ed;
      padding: 20px 0;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      font-size: 1.1rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: #4a4f66;
      margin-top: 8px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
    }
    
    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, #0A0E27, #141835);
      color: white;
    }
    
    /* Footer */
    .footer {
      background: #0A0E27;
      color: #B0B5CC;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    
    @media (max-width: 1024px) {
      .hero .container { grid-template-columns: 1fr; }
      .hero-visual { height: 300px; }
      .solutions-grid, .pain-grid, .testimonial-grid { grid-template-columns: repeat(2,1fr); }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .solutions-grid, .pain-grid, .testimonial-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .hero-content h1 { font-size: 32px; }
    }