/* roulang page: index */
:root {
      --panda-black: #1A1A1A;
      --panda-white: #FFFFFF;
      --comp-green: #00C853;
      --energy-orange: #FF6D00;
      --bg-light: #FAFAFA;
      --text-primary: #1A1A1A;
      --text-secondary: #666666;
      --text-light: #CCCCCC;
      --card-shadow: 0 2px 12px rgba(0,0,0,0.06);
      --card-shadow-hover: 0 8px 24px rgba(0,0,0,0.12);
      --radius-lg: 12px;
      --radius-md: 8px;
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-number: 'DIN Alternate', 'Roboto', 'Oswald', sans-serif;
      --transition: 0.2s ease;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    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;
    }

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

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

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    #header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: var(--panda-white);
      z-index: 1000;
      height: 64px;
      display: flex;
      align-items: center;
      box-shadow: 0 1px 8px rgba(0,0,0,0.04);
      transition: box-shadow 0.2s;
    }

    #header.scrolled {
      box-shadow: 0 2px 12px rgba(0,0,0,0.08);
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-family: 'Oswald', var(--font-heading);
      font-weight: 700;
      font-size: 1.8rem;
      letter-spacing: 2px;
      color: var(--panda-black);
      text-transform: uppercase;
    }

    .logo-icon {
      width: 36px;
      height: 36px;
      background: var(--panda-black);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
    }

    .logo-icon::before {
      content: "🐼";
      font-size: 20px;
      filter: grayscale(100%) brightness(2);
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
    }

    .nav-menu a {
      font-weight: 600;
      font-size: 0.95rem;
      color: var(--text-primary);
      transition: color 0.2s;
      position: relative;
    }

    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--comp-green);
      transition: width 0.2s;
    }

    .nav-menu a:hover::after,
    .nav-menu a.active::after {
      width: 100%;
    }

    .btn-primary {
      background: var(--comp-green);
      color: var(--panda-white);
      padding: 10px 24px;
      border-radius: var(--radius-md);
      font-weight: 700;
      font-size: 0.9rem;
      letter-spacing: 0.5px;
      border: none;
      cursor: pointer;
      transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
      display: inline-block;
    }

    .btn-primary:hover {
      background: #00b84c;
      transform: translateY(-2px);
      box-shadow: 0 6px 16px rgba(0,200,83,0.3);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--panda-black);
      color: var(--panda-black);
      padding: 10px 24px;
      border-radius: var(--radius-md);
      font-weight: 700;
      font-size: 0.9rem;
      transition: all 0.2s;
      display: inline-block;
    }

    .btn-outline:hover {
      background: var(--panda-black);
      color: var(--panda-white);
      transform: translateY(-2px);
    }

    .btn-orange {
      background: var(--energy-orange);
      color: var(--panda-white);
      border: none;
    }

    .btn-orange:hover {
      background: #e65100;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
    }

    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--panda-black);
      transition: 0.3s;
    }

    /* 板块通用 */
    section {
      padding: 80px 0;
    }

    .section-title {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 2.4rem;
      margin-bottom: 16px;
      color: var(--panda-black);
    }

    .section-subtitle {
      color: var(--text-secondary);
      font-size: 1.1rem;
      margin-bottom: 48px;
    }

    .text-center {
      text-align: center;
    }

    /* Hero */
    #hero {
      background: linear-gradient(180deg, rgba(0,0,0,0.65) 0%, rgba(0,0,0,0.45) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 90vh;
      display: flex;
      align-items: center;
      color: var(--panda-white);
      margin-top: 64px;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 40px;
    }

    .hero-text {
      flex: 1;
    }

    .hero-text h1 {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 3.2rem;
      line-height: 1.2;
      margin-bottom: 20px;
      color: white;
    }

    .hero-text p {
      font-size: 1.2rem;
      opacity: 0.9;
      margin-bottom: 32px;
    }

    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .hero-visual {
      flex: 1;
      display: flex;
      justify-content: center;
    }

    .hero-graphic {
      width: 280px;
      height: 280px;
      border: 2px solid rgba(255,255,255,0.4);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      backdrop-filter: blur(4px);
    }

    /* 痛点 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
      margin-top: 24px;
    }

    .pain-item {
      text-align: center;
      padding: 24px;
      background: var(--panda-white);
      border-radius: var(--radius-lg);
      box-shadow: var(--card-shadow);
    }

    .pain-icon {
      font-size: 2.5rem;
      margin-bottom: 16px;
    }

    /* 解决方案卡片 */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .solution-card {
      background: var(--panda-white);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--card-shadow);
      transition: all 0.25s;
    }

    .solution-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--card-shadow-hover);
    }

    .solution-card img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      background: #e0e0e0;
    }

    .solution-content {
      padding: 20px;
    }

    /* 优势 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    .adv-item {
      display: flex;
      gap: 16px;
      align-items: flex-start;
    }

    .adv-icon {
      width: 48px;
      height: 48px;
      background: var(--comp-green);
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 1.5rem;
    }

    /* 成果深色块 */
    #results {
      background: var(--panda-black);
      color: white;
    }

    .results-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }

    .result-number {
      font-family: var(--font-number);
      font-size: 3.5rem;
      font-weight: 700;
      color: var(--comp-green);
    }

    /* 客户证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }

    .testimonial-card {
      background: white;
      padding: 24px;
      border-radius: var(--radius-lg);
      display: flex;
      gap: 16px;
      align-items: center;
      box-shadow: var(--card-shadow);
    }

    .avatar-placeholder {
      width: 64px;
      height: 64px;
      background: #ddd;
      border-radius: 50%;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      border-bottom: 1px solid #e0e0e0;
      padding: 20px 0;
    }

    .faq-question {
      font-weight: 700;
      font-size: 1.1rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
    }

    .faq-item.open .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }

    /* CTA */
    #cta {
      background: var(--energy-orange);
      color: white;
      text-align: center;
    }

    /* 页脚 */
    #footer {
      background: var(--panda-black);
      color: var(--text-light);
      padding: 40px 0;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }

    @media (max-width: 1024px) {
      .pain-grid, .solution-grid, .advantages-grid { grid-template-columns: 1fr 1fr; }
      .results-grid { grid-template-columns: 1fr 1fr; }
      .testimonial-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .hero-text h1 { font-size: 2.5rem; }
    }

    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: flex; }
      .hero-grid { flex-direction: column; }
      .pain-grid, .solution-grid, .advantages-grid { grid-template-columns: 1fr; }
      .results-grid { grid-template-columns: 1fr; }
      .section-title { font-size: 2rem; }
      .hero-text h1 { font-size: 2rem; }
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 64px;
      left: 0;
      width: 100%;
      background: white;
      flex-direction: column;
      padding: 20px;
      box-shadow: 0 4px 12px rgba(0,0,0,0.1);
      z-index: 999;
    }

    .mobile-menu a {
      padding: 12px 0;
      font-weight: 600;
      border-bottom: 1px solid #f0f0f0;
    }