/* roulang page: index */
:root {
      --deep-black: #1A1A1A;
      --dark-bg: #0D0D0D;
      --champagne-gold: #C8A96E;
      --gold-hover: #B8995A;
      --wine-red: #8B3A3A;
      --light-bg: #FAF8F5;
      --light-text: #2C2C2C;
      --dark-text: #F0EDE8;
      --muted-light: #8C8C8C;
      --border-light: #E0DBD2;
      --border-dark: #3A3A3A;
      --card-shadow-light: 0 2px 20px rgba(0,0,0,0.06);
      --card-shadow-dark: 0 4px 30px rgba(0,0,0,0.4);
      --radius-sm: 4px;
      --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: 'Georgia', 'Times New Roman', serif;
      --transition-base: 0.3s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--light-bg);
      color: var(--light-text);
      line-height: 1.8;
      margin: 0;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      letter-spacing: -0.02em;
      margin: 0;
    }
    a {
      transition: var(--transition-base);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container-section {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航系统 */
    .top-bar-info {
      background: var(--dark-bg);
      color: #A09888;
      font-size: 12px;
      height: 32px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 24px;
      position: relative;
      z-index: 30;
      letter-spacing: 0.5px;
    }
    .top-bar-info a {
      color: #A09888;
      text-decoration: none;
    }
    .top-bar-info a:hover {
      color: var(--champagne-gold);
    }
    .main-header {
      position: sticky;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 25;
      background: rgba(13,13,13,0.85);
      backdrop-filter: blur(10px);
      transition: background 0.3s, box-shadow 0.3s;
      height: 72px;
      display: flex;
      align-items: center;
      box-shadow: 0 2px 10px rgba(0,0,0,0.2);
    }
    .main-header.scrolled {
      background: rgba(13,13,13,0.98);
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo-brand {
      font-size: 24px;
      font-weight: 700;
      color: var(--champagne-gold);
      text-decoration: none;
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo-icon {
      font-size: 28px;
      color: var(--champagne-gold);
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      color: #D0CCC5;
      text-decoration: none;
      font-size: 15px;
      font-weight: 500;
      position: relative;
      padding: 4px 0;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--champagne-gold);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--champagne-gold);
      transition: width 0.3s;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
      background: transparent;
      border: none;
      padding: 8px;
    }
    .hamburger span {
      width: 26px;
      height: 2px;
      background: var(--champagne-gold);
      border-radius: 2px;
      transition: 0.3s;
    }
    /* 板块通用 */
    section {
      padding: 100px 0;
    }
    .section-dark {
      background: var(--dark-bg);
      color: var(--dark-text);
    }
    .section-light {
      background: var(--light-bg);
      color: var(--light-text);
    }
    .section-title {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 16px;
      color: inherit;
    }
    .section-subtitle {
      font-size: 18px;
      color: var(--muted-light);
      margin-bottom: 48px;
      max-width: 700px;
    }
    .dark-title {
      color: var(--champagne-gold);
    }
    .dark-subtitle {
      color: #A09888;
    }
    /* 按钮 */
    .btn-primary {
      background: var(--champagne-gold);
      color: var(--deep-black);
      font-weight: 600;
      padding: 14px 36px;
      border-radius: var(--radius-sm);
      text-decoration: none;
      display: inline-block;
      border: none;
      cursor: pointer;
      transition: all 0.3s ease;
      box-shadow: 0 4px 12px rgba(200,169,110,0.25);
      letter-spacing: 0.5px;
    }
    .btn-primary:hover {
      background: var(--gold-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 24px rgba(200,169,110,0.4);
      color: var(--deep-black);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--champagne-gold);
      color: var(--champagne-gold);
      font-weight: 600;
      padding: 12px 32px;
      border-radius: var(--radius-sm);
      text-decoration: none;
      display: inline-block;
      transition: all 0.3s ease;
    }
    .btn-outline:hover {
      background: var(--champagne-gold);
      color: var(--deep-black);
    }
    .dark-outline {
      color: var(--dark-text);
      border-color: var(--dark-text);
    }
    .dark-outline:hover {
      background: var(--dark-text);
      color: var(--deep-black);
    }
    /* Hero */
    .hero-section {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #0D0D0D 0%, #1A1A1A 100%);
      color: white;
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 40px;
    }
    .hero-left {
      flex: 1 1 50%;
    }
    .hero-right {
      flex: 1 1 40%;
      position: relative;
    }
    .hero-right img {
      border-radius: 12px;
      opacity: 0.9;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
    }
    .hero-h1 {
      font-size: 52px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--champagne-gold);
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 20px;
      color: #B0A89A;
      margin-bottom: 36px;
      font-weight: 400;
    }
    /* 痛点卡片 */
    .pain-grid {
      display: flex;
      gap: 30px;
      flex-wrap: wrap;
      margin-top: 40px;
    }
    .pain-card {
      background: #1A1A1A;
      padding: 32px;
      border-radius: var(--radius-sm);
      flex: 1 1 250px;
      border-left: 4px solid var(--wine-red);
      box-shadow: var(--card-shadow-dark);
    }
    .pain-icon {
      font-size: 32px;
      color: var(--champagne-gold);
      margin-bottom: 16px;
    }
    /* 解决方案错落栅格 */
    .solution-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 30px;
      margin-top: 40px;
    }
    .solution-main {
      background: white;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--card-shadow-light);
    }
    .solution-side {
      display: flex;
      flex-direction: column;
      gap: 30px;
    }
    .solution-card {
      background: white;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--card-shadow-light);
    }
    .solution-img {
      height: 220px;
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .solution-img::after {
      content: '';
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: rgba(200,169,110,0.25);
    }
    .solution-text {
      padding: 28px;
    }
    .feature-list {
      list-style: none;
      padding: 0;
      margin-top: 12px;
    }
    .feature-list li {
      margin-bottom: 8px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .feature-list i {
      color: var(--champagne-gold);
    }
    /* 成果数据 */
    .results-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 30px;
      text-align: center;
    }
    .result-item .big-number {
      font-family: var(--font-number);
      font-size: 56px;
      color: var(--champagne-gold);
      font-weight: 700;
    }
    /* 证言 */
    .testimonial-grid {
      display: flex;
      gap: 30px;
      flex-wrap: wrap;
    }
    .testimonial-card {
      background: white;
      padding: 32px;
      border-radius: var(--radius-md);
      box-shadow: var(--card-shadow-light);
      flex: 1 1 280px;
      display: flex;
      gap: 20px;
      align-items: flex-start;
    }
    .avatar-placeholder {
      width: 64px;
      height: 64px;
      border-radius: 50%;
      background: #ddd;
      flex-shrink: 0;
    }
    /* FAQ */
    .accordion-faq {
      margin-top: 30px;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 16px 0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 18px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--deep-black);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background: #F5F2ED;
      padding: 0 20px;
      margin-top: 8px;
      border-radius: 4px;
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 20px;
    }
    /* 联系表单 */
    .contact-form input, .contact-form textarea {
      background: #1A1A1A;
      border: 1px solid #3A3A3A;
      color: #F0EDE8;
      padding: 14px;
      border-radius: 4px;
    }
    .contact-form input:focus, .contact-form textarea:focus {
      border-color: var(--champagne-gold);
      outline: none;
    }
    .footer {
      background: #0D0D0D;
      color: #8C8C8C;
      padding: 60px 0 30px;
    }
    @media (max-width: 1024px) {
      .solution-grid {
        grid-template-columns: 1fr;
      }
      .hero-h1 {
        font-size: 40px;
      }
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(13,13,13,0.98);
        flex-direction: column;
        padding: 24px;
        gap: 16px;
      }
      .nav-links.show {
        display: flex;
      }
      .hamburger {
        display: flex;
      }
      .hero-grid {
        flex-direction: column;
      }
      .pain-grid, .testimonial-grid {
        flex-direction: column;
      }
    }