/* roulang page: index */
:root {
      --primary-red: #FF3B30;
      --dark-bg: #1A1A2E;
      --deep-bg: #0F0F23;
      --gold-accent: #FFD700;
      --soft-gray: #F8F9FA;
      --text-main: #1E1E2E;
      --text-muted: #5A5A6E;
      --card-shadow: 0 20px 35px rgba(0, 0, 0, 0.05);
      --card-hover-shadow: 0 28px 45px rgba(0, 0, 0, 0.1);
      --border-radius-card: 24px;
      --border-radius-btn: 14px;
      --transition-smooth: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: #ffffff;
      color: var(--text-main);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-smooth);
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
    }

    /* 滚动条美化 */
    ::-webkit-scrollbar {
      width: 6px;
    }
    ::-webkit-scrollbar-track {
      background: #f1f1f1;
    }
    ::-webkit-scrollbar-thumb {
      background: var(--primary-red);
      border-radius: 12px;
    }

    /* 导航系统 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 76px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 48px;
      z-index: 50;
      transition: background 0.4s ease, backdrop-filter 0.4s ease, box-shadow 0.3s;
      background: transparent;
    }
    .navbar.scrolled {
      background: rgba(26, 26, 46, 0.85);
      backdrop-filter: blur(24px);
      box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    }
    .logo {
      font-size: 28px;
      font-weight: 700;
      color: white;
      letter-spacing: 2px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo i {
      color: var(--primary-red);
      font-size: 32px;
    }
    .nav-links {
      display: flex;
      gap: 36px;
      align-items: center;
      font-weight: 500;
      color: rgba(255,255,255,0.85);
    }
    .nav-links a {
      position: relative;
      padding: 8px 0;
      font-size: 16px;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary-red);
      transition: width 0.3s;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .nav-cta {
      background: var(--primary-red);
      padding: 10px 24px;
      border-radius: 30px;
      color: white !important;
      font-weight: 600;
      transition: 0.3s;
      box-shadow: 0 6px 18px rgba(255,59,48,0.4);
    }
    .nav-cta:hover {
      background: #e0352b;
      transform: scale(1.03);
    }

    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
    }
    @media (max-width: 768px) {
      .navbar {
        padding: 0 20px;
        height: 68px;
      }
      .nav-links {
        display: none;
      }
      .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        height: 68px;
        background: rgba(26,26,46,0.95);
        backdrop-filter: blur(30px);
        justify-content: space-around;
        align-items: center;
        z-index: 60;
        border-top: 1px solid rgba(255,255,255,0.08);
      }
      .mobile-bottom-nav a {
        display: flex;
        flex-direction: column;
        align-items: center;
        color: rgba(255,255,255,0.7);
        font-size: 12px;
        gap: 4px;
        transition: 0.2s;
      }
      .mobile-bottom-nav a i {
        font-size: 20px;
      }
      .mobile-bottom-nav a.active {
        color: var(--primary-red);
      }
    }

    /* Hero 区域 */
    .hero-section {
      min-height: 100vh;
      background: linear-gradient(135deg, #1A1A2E 0%, #0F0F23 100%);
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.1fr 1fr;
      gap: 50px;
      align-items: center;
    }
    .hero-text h1 {
      font-size: 54px;
      font-weight: 800;
      color: white;
      line-height: 1.2;
      margin-bottom: 20px;
    }
    .hero-text .highlight {
      color: var(--gold-accent);
    }
    .hero-sub {
      font-size: 18px;
      color: rgba(255,255,255,0.8);
      margin-bottom: 36px;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary-red);
      color: white;
      padding: 16px 38px;
      border-radius: var(--border-radius-btn);
      font-weight: 700;
      font-size: 18px;
      box-shadow: 0 10px 25px rgba(255,59,48,0.45);
      transition: var(--transition-smooth);
      border: none;
      cursor: pointer;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      filter: brightness(1.1);
      transform: translateY(-3px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid rgba(255,255,255,0.7);
      color: white;
      padding: 16px 38px;
      border-radius: var(--border-radius-btn);
      font-weight: 600;
      transition: var(--transition-smooth);
      backdrop-filter: blur(8px);
    }
    .btn-outline:hover {
      background: rgba(255,255,255,0.1);
      border-color: white;
    }
    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 32px;
      height: 420px;
      box-shadow: 0 30px 50px rgba(0,0,0,0.5);
      animation: float 6s ease-in-out infinite;
      border: 1px solid rgba(255,215,0,0.25);
    }
    @keyframes float {
      0% { transform: translateY(0px); }
      50% { transform: translateY(-12px); }
      100% { transform: translateY(0px); }
    }
    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .hero-image {
        height: 300px;
        order: -1;
      }
      .hero-text h1 {
        font-size: 40px;
      }
    }

    /* 通用板块 */
    .section {
      padding: 90px 0;
    }
    .section-dark {
      background: #1A1A2E;
      color: white;
    }
    .section-light {
      background: #F8F9FA;
    }
    .section-title {
      font-size: 38px;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .card {
      background: white;
      border-radius: var(--border-radius-card);
      padding: 32px;
      box-shadow: var(--card-shadow);
      transition: var(--transition-smooth);
      border: 1px solid transparent;
    }
    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--card-hover-shadow);
      border-color: var(--primary-red);
    }

    /* 痛点卡片 */
    .pain-card {
      background: #ffffff;
      border-left: 5px solid var(--primary-red);
    }

    /* 数据徽章 */
    .badge-gold {
      background: rgba(255,215,0,0.12);
      color: #FFD700;
      font-weight: 700;
      padding: 6px 16px;
      border-radius: 30px;
      font-size: 15px;
    }

    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid #e0e0e0;
    }
    .faq-question {
      cursor: pointer;
      padding: 20px 0;
      display: flex;
      justify-content: space-between;
      font-weight: 600;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.45s ease;
      background: #f5f5f8;
      border-radius: 12px;
      margin-bottom: 10px;
      padding: 0 20px;
      color: #4a4a5e;
    }

    /* CTA 脉冲 */
    .pulse-animation {
      animation: pulse 2.2s infinite;
    }
    @keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(255,59,48,0.6); }
      70% { box-shadow: 0 0 0 18px rgba(255,59,48,0); }
      100% { box-shadow: 0 0 0 0 rgba(255,59,48,0); }
    }

    footer {
      background: #0F0F23;
      color: #ccc;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }