/* roulang page: index */
:root {
      --primary: #E8451E;
      --primary-hover: #FF6B3D;
      --secondary: #1B3A4B;
      --accent: #FFB400;
      --bg-warm: #F7F5F0;
      --white: #FFFFFF;
      --text-main: #1E1E1E;
      --text-muted: #5A5A5A;
      --border-light: #E8E5DF;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 28px rgba(0,0,0,0.10);
      --radius-xl: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --radius-btn: 50px;
      --font-zh: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-en: "Inter", "SF Pro Display", system-ui;
      --max-width: 1200px;
      --spacing-section: 120px;
      --spacing-medium: 80px;
      --spacing-small: 60px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font-zh);
      background-color: var(--white);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button, .button {
      cursor: pointer;
      font-family: var(--font-zh);
      transition: all 0.2s ease;
      border: none;
      outline: none;
    }
    h1, h2, h3 {
      margin-bottom: 0.5em;
    }
    h1 {
      font-size: 48px;
      line-height: 1.2;
      font-weight: 800;
      letter-spacing: -0.5px;
    }
    h2 {
      font-size: 36px;
      line-height: 1.3;
      font-weight: 700;
    }
    h3 {
      font-size: 22px;
      line-height: 1.4;
      font-weight: 600;
    }
    .section {
      padding: var(--spacing-section) 0;
    }
    @media (max-width: 1024px) {
      h1 { font-size: 40px; }
      h2 { font-size: 30px; }
      .section { padding: var(--spacing-medium) 0; }
    }
    @media (max-width: 640px) {
      h1 { font-size: 32px; }
      h2 { font-size: 26px; }
      h3 { font-size: 20px; }
      .section { padding: var(--spacing-small) 0; }
      body { font-size: 15px; }
    }
    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: var(--white);
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
      z-index: 100;
      padding: 12px 0;
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      font-size: 24px;
      font-weight: 800;
      display: flex;
      align-items: center;
      gap: 4px;
      color: var(--text-main);
    }
    .logo .icon {
      color: var(--primary);
      font-size: 28px;
    }
    .logo .brand-light {
      color: var(--primary);
    }
    .nav-chips {
      display: flex;
      gap: 8px;
      flex-wrap: wrap;
    }
    .nav-chip {
      background: #f0f0f0;
      padding: 8px 16px;
      border-radius: 20px;
      font-size: 14px;
      font-weight: 500;
      color: var(--text-main);
      transition: all 0.2s;
    }
    .nav-chip:hover, .nav-chip.active {
      background: var(--primary);
      color: white;
    }
    .header-cta {
      background: linear-gradient(135deg, var(--primary), var(--primary-hover));
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 15px;
      white-space: nowrap;
    }
    .header-cta:hover {
      filter: brightness(1.1);
      transform: scale(1.03);
    }
    .hamburger {
      display: none;
      font-size: 24px;
      background: none;
      color: var(--text-main);
      cursor: pointer;
    }
    @media (max-width: 840px) {
      .nav-chips, .header-cta.desktop-only {
        display: none;
      }
      .hamburger {
        display: block;
      }
    }
    .mobile-menu {
      display: none;
      flex-direction: column;
      background: white;
      padding: 20px;
      gap: 12px;
      box-shadow: 0 10px 20px rgba(0,0,0,0.05);
    }
    .mobile-menu.active {
      display: flex;
    }
    /* Hero */
    #hero {
      min-height: 90vh;
      background: linear-gradient(135deg, #1B3A4B 0%, #0F2838 40%, #E8451E 100%);
      position: relative;
      display: flex;
      align-items: center;
      color: white;
      margin-top: 70px;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.2;
      z-index: 0;
    }
    .hero-radial {
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 40%, rgba(255,180,0,0.25) 0%, transparent 60%);
      z-index: 1;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
      padding: 40px 0;
    }
    .hero-badges {
      display: flex;
      gap: 20px;
      margin-top: 40px;
      flex-wrap: wrap;
    }
    .badge {
      background: linear-gradient(135deg, #FFB400, #E8451E);
      border-radius: var(--radius-md);
      padding: 16px 24px;
      text-align: center;
      color: white;
      min-width: 120px;
    }
    .badge .number {
      font-family: var(--font-en);
      font-size: 32px;
      font-weight: 700;
      display: block;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      margin-top: 32px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, #E8451E, #FF6B3D);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 700;
    }
    .btn-outline {
      border: 2px solid white;
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      background: transparent;
    }
    .btn-outline:hover {
      background: white;
      color: var(--primary);
    }
    @media (max-width: 640px) {
      .hero-badges {
        flex-wrap: nowrap;
        overflow-x: auto;
        gap: 12px;
      }
      .badge {
        min-width: 100px;
        padding: 12px;
      }
    }
    /* 通用卡片 */
    .card {
      background: var(--white);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-light);
      transition: all 0.25s ease;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-top: 3px solid var(--primary);
    }
    /* 痛点 */
    .pain-grid {
      display: flex;
      gap: 40px;
      flex-wrap: wrap;
      align-items: center;
    }
    .pain-item {
      display: flex;
      gap: 16px;
      align-items: flex-start;
      margin-bottom: 28px;
    }
    .pain-icon {
      color: var(--primary);
      font-size: 28px;
    }
    /* 解决方案卡片 */
    .solution-cards {
      display: grid;
      grid-template-columns: 1.5fr 1fr;
      gap: 24px;
    }
    @media (max-width: 768px) {
      .solution-cards {
        grid-template-columns: 1fr;
      }
    }
    .solution-main {
      background: url('/assets/images/coverpic/cover-1.webp') center/cover no-repeat;
      min-height: 320px;
      border-radius: var(--radius-xl);
      position: relative;
      overflow: hidden;
      display: flex;
      align-items: flex-end;
      color: white;
    }
    .solution-main .overlay {
      background: linear-gradient(0deg, rgba(0,0,0,0.7) 0%, transparent 70%);
      padding: 32px;
      width: 100%;
    }
    /* 优势网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    @media (max-width: 1024px) {
      .features-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 640px) {
      .features-grid { grid-template-columns: 1fr; }
    }
    .feature-card {
      padding: 32px 24px;
    }
    .feature-icon {
      background: rgba(232,69,30,0.1);
      width: 60px;
      height: 60px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 26px;
      margin-bottom: 20px;
    }
    /* 成果区 */
    #results {
      background: var(--secondary);
      color: white;
    }
    .results-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .result-card {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(10px);
      border-radius: var(--radius-md);
      padding: 28px;
    }
    @media (max-width: 640px) {
      .results-grid { grid-template-columns: 1fr; }
    }
    /* FAQ */
    .accordion-item {
      border-bottom: 1px solid var(--border-light);
      padding: 16px 0;
    }
    .accordion-title {
      font-weight: 600;
      font-size: 18px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-muted);
    }
    /* CTA */
    #cta {
      background: linear-gradient(135deg, #1B3A4B 0%, #E8451E 100%);
    }
    /* 页脚 */
    .site-footer {
      background: #141C22;
      color: #ccc;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr; }
    }