/* roulang page: index */
:root {
      --copper: #B87333;
      --copper-deep: #9A5F2B;
      --dark-gray: #2C2C2C;
      --warm-white: #F9F6F0;
      --pure-white: #FFFFFF;
      --patina: #5F8B7A;
      --success: #3B6B4F;
      --warning: #D4783C;
      --text-main: #2C2C2C;
      --text-light: rgba(44,44,44,0.7);
      --border-light: rgba(44,44,44,0.08);
      --shadow-sm: 0 2px 12px rgba(44,44,44,0.06);
      --shadow-md: 0 8px 24px rgba(44,44,44,0.12);
      --radius-card: 8px;
      --radius-btn: 6px;
      --radius-input: 4px;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
      --transition: all 0.25s ease;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--warm-white);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }
    
    h1, h2, h3, h4 {
      font-weight: 600;
      letter-spacing: -0.2px;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    /* 容器微调 */
    .container-custom {
      max-width: 1140px;
      margin: 0 auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    
    /* 顶部信息条 */
    .top-bar {
      background: var(--dark-gray);
      color: var(--warm-white);
      font-size: 12px;
      height: 36px;
      display: flex;
      align-items: center;
      padding: 0 24px;
      letter-spacing: 0.3px;
    }
    .top-bar .domain-hint {
      margin-right: auto;
      opacity: 0.9;
    }
    .top-bar .action-entry {
      display: flex;
      align-items: center;
      gap: 18px;
    }
    .top-bar i {
      margin-right: 4px;
      color: var(--copper);
    }
    
    /* 主导航 */
    .main-nav {
      background: var(--warm-white);
      height: 64px;
      border-bottom: 1px solid var(--border-light);
      display: flex;
      align-items: center;
      padding: 0 24px;
      position: sticky;
      top: 0;
      z-index: 1020;
    }
    .nav-logo {
      font-weight: 700;
      font-size: 24px;
      color: var(--copper);
      display: flex;
      align-items: center;
      gap: 6px;
      letter-spacing: 0.5px;
    }
    .nav-logo i {
      font-size: 28px;
      color: var(--patina);
    }
    .nav-links {
      margin-left: auto;
      display: flex;
      gap: 28px;
    }
    .nav-links a {
      color: var(--dark-gray);
      font-weight: 500;
      font-size: 15px;
      padding: 8px 0;
      border-bottom: 2px solid transparent;
      transition: var(--transition);
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--copper);
      border-bottom-color: var(--copper);
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--dark-gray);
      margin-left: auto;
    }
    
    /* Hero */
    #hero {
      background-color: var(--warm-white);
      background-image: radial-gradient(circle at 20% 30%, rgba(184,115,51,0.03) 0%, transparent 45%);
      padding: 60px 0;
    }
    .hero-content h1 {
      font-size: 36px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--dark-gray);
      margin-bottom: 1rem;
    }
    .hero-content .subtitle {
      font-size: 18px;
      color: var(--text-light);
      margin-bottom: 2rem;
      line-height: 1.6;
    }
    .btn-primary-custom {
      background: var(--copper);
      border: none;
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
      display: inline-block;
      text-align: center;
      box-shadow: 0 4px 10px rgba(184,115,51,0.2);
    }
    .btn-primary-custom:hover {
      background: var(--copper-deep);
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(184,115,51,0.3);
      color: white;
    }
    .btn-outline-copper {
      background: transparent;
      border: 1.5px solid var(--copper);
      color: var(--copper);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
      display: inline-block;
      margin-left: 12px;
    }
    .btn-outline-copper:hover {
      background: rgba(184,115,51,0.06);
      color: var(--copper-deep);
      border-color: var(--copper-deep);
    }
    .hero-image-wrapper {
      position: relative;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-md);
    }
    .hero-image-wrapper img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }
    .hero-overlay {
      position: absolute;
      top: 0; left: 0; width: 100%; height: 100%;
      background: linear-gradient(135deg, rgba(184,115,51,0.18) 0%, transparent 60%);
    }
    
    /* 通用区块 */
    section {
      padding: 70px 0;
    }
    .section-header {
      text-align: center;
      margin-bottom: 48px;
    }
    .section-header h2 {
      font-size: 28px;
      font-weight: 600;
      color: var(--dark-gray);
      position: relative;
      display: inline-block;
    }
    .section-header h2::after {
      content: '';
      position: absolute;
      bottom: -8px;
      left: 50%;
      transform: translateX(-50%);
      width: 48px;
      height: 3px;
      background: var(--copper);
      border-radius: 2px;
    }
    
    /* 卡片系统 */
    .card-custom {
      background: var(--pure-white);
      border-radius: var(--radius-card);
      padding: 28px 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      border: none;
      height: 100%;
    }
    .card-custom:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 28px rgba(44,44,44,0.12), 0 0 0 1px rgba(184,115,51,0.15);
    }
    .icon-patina {
      color: var(--patina);
      font-size: 32px;
      margin-bottom: 16px;
    }
    .card-custom h3 {
      font-size: 20px;
      margin-bottom: 12px;
      color: var(--dark-gray);
    }
    .card-custom p {
      color: var(--text-light);
      line-height: 1.7;
    }
    
    /* 成果数字 */
    .metric-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--copper);
      line-height: 1.1;
      font-family: 'Inter', sans-serif;
    }
    .metric-unit {
      font-size: 20px;
      font-weight: 500;
    }
    
    /* 证言 */
    .testimonial-card {
      background: var(--pure-white);
      border-left: 3px solid var(--copper);
      padding: 24px;
      border-radius: 0 var(--radius-card) var(--radius-card) 0;
      box-shadow: var(--shadow-sm);
    }
    .quote-icon {
      color: var(--patina);
      font-size: 36px;
      font-family: serif;
      line-height: 1;
    }
    
    /* FAQ 手风琴 */
    .accordion-custom .accordion-item {
      border: none;
      background: transparent;
      margin-bottom: 12px;
    }
    .accordion-custom .accordion-header button {
      background: var(--warm-white);
      color: var(--dark-gray);
      font-weight: 600;
      padding: 16px 20px;
      border-radius: var(--radius-card);
      box-shadow: none;
      transition: var(--transition);
      display: flex;
      align-items: center;
      width: 100%;
      text-align: left;
      border: none;
    }
    .accordion-custom .accordion-header button:hover {
      background: rgba(184,115,51,0.08);
    }
    .accordion-custom .accordion-header button:not(.collapsed) {
      background: var(--pure-white);
      color: var(--copper);
      box-shadow: var(--shadow-sm);
    }
    .accordion-custom .accordion-body {
      background: var(--pure-white);
      color: var(--text-light);
      padding: 0 20px 20px;
      border-radius: 0 0 var(--radius-card) var(--radius-card);
    }
    
    /* CTA底部 */
    .cta-final {
      background: var(--dark-gray);
      color: var(--warm-white);
      padding: 60px 0;
    }
    .cta-final h2 {
      color: white;
    }
    .input-dark {
      background: transparent;
      border: 1px solid rgba(255,255,255,0.25);
      border-radius: var(--radius-input);
      padding: 10px 16px;
      color: white;
      width: 100%;
      margin-bottom: 12px;
    }
    .input-dark:focus {
      outline: none;
      border-color: var(--copper);
      box-shadow: 0 0 0 2px rgba(184,115,51,0.3);
    }
    .btn-light-copper {
      background: var(--warm-white);
      color: var(--copper);
      border: none;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
    }
    .btn-light-copper:hover {
      background: white;
    }
    
    /* 页脚 */
    .footer {
      background: var(--dark-gray);
      color: rgba(249,246,240,0.7);
      padding: 40px 0 20px;
      font-size: 14px;
    }
    .footer a {
      color: rgba(249,246,240,0.8);
    }
    .footer a:hover {
      color: var(--copper);
    }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 24px;
      padding-top: 16px;
      text-align: center;
      font-size: 13px;
    }
    
    /* 响应式 */
    @media (max-width: 992px) {
      .hero-content h1 { font-size: 30px; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-menu-btn { display: block; }
      .hero-content h1 { font-size: 28px; }
      .btn-outline-copper { margin-left: 0; margin-top: 10px; }
      .metric-number { font-size: 36px; }
    }
    @media (max-width: 576px) {
      section { padding: 50px 0; }
      .card-custom { padding: 20px; }
    }
    
    .mobile-menu {
      position: fixed; top: 0; left: 0; width: 100%; height: 100%;
      background: var(--warm-white); z-index: 1050; display: flex;
      flex-direction: column; align-items: center; justify-content: center;
      gap: 32px; font-size: 22px; transform: translateX(100%);
      transition: transform 0.3s ease;
    }
    .mobile-menu.open { transform: translateX(0); }