/* roulang page: index */
:root {
      --deep-green: #0B2B26;
      --deep-green-light: #12403A;
      --sand-gold: #C8A96E;
      --warm-white: #F7F5F0;
      --pure-white: #FFFFFF;
      --coral: #B85450;
      --border-light: #E5E0D8;
      --text-dark: #1E1E1E;
      --text-muted: #5A5A5A;
      --shadow-soft: 0 8px 30px rgba(0, 0, 0, 0.04);
      --font-serif: 'Noto Serif SC', 'Times New Roman', serif;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --border-radius: 2px;
      --transition-base: 0.25s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--warm-white);
      color: var(--text-dark);
      line-height: 1.7;
      margin: 0;
      padding-top: 80px;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, .font-serif {
      font-family: var(--font-serif);
      font-weight: 700;
      color: #0B2B26;
    }

    h2 {
      font-size: 42px;
      font-weight: 700;
      margin-bottom: 1.5rem;
    }

    h3 {
      font-size: 24px;
      font-weight: 600;
    }

    a {
      color: var(--deep-green);
      text-decoration: none;
      transition: color var(--transition-base);
    }

    a:hover {
      color: var(--sand-gold);
    }

    .container-custom {
      max-width: 1280px;
      margin: 0 auto;
      padding-left: 15px;
      padding-right: 15px;
    }

    /* 按钮系统 */
    .btn-primary-custom {
      background-color: var(--deep-green);
      color: var(--sand-gold);
      border: none;
      border-radius: var(--border-radius);
      padding: 14px 36px;
      font-weight: 500;
      letter-spacing: 0.5px;
      font-family: var(--font-sans);
      transition: background-color var(--transition-base), color var(--transition-base);
      text-transform: uppercase;
      font-size: 0.9rem;
      display: inline-block;
      text-align: center;
    }

    .btn-primary-custom:hover {
      background-color: var(--deep-green-light);
      color: #E5D5B0;
    }

    .btn-outline-custom {
      background: transparent;
      border: 1px solid var(--deep-green);
      color: var(--deep-green);
      padding: 14px 36px;
      font-weight: 500;
      letter-spacing: 0.5px;
      border-radius: var(--border-radius);
      transition: all var(--transition-base);
      display: inline-block;
    }

    .btn-outline-custom:hover {
      background-color: var(--deep-green);
      color: var(--sand-gold);
      border-color: var(--deep-green);
    }

    .text-link {
      color: var(--deep-green);
      font-weight: 500;
      border-bottom: 2px solid var(--sand-gold);
      padding-bottom: 2px;
      transition: border-color var(--transition-base), color var(--transition-base);
    }

    .text-link:hover {
      border-bottom-color: var(--deep-green);
      color: #0B2B26;
    }

    /* 导航 */
    .navbar-custom {
      background-color: rgba(247, 245, 240, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid rgba(11, 43, 38, 0.08);
      padding: 0 2rem;
      position: fixed;
      top: 0;
      width: 100%;
      z-index: 1000;
      height: 80px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .navbar-brand {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--deep-green);
      letter-spacing: 1px;
    }

    .nav-link {
      color: var(--text-dark) !important;
      font-weight: 500;
      margin: 0 0.5rem;
      padding: 0.5rem 0.8rem !important;
      transition: color var(--transition-base);
      font-size: 0.95rem;
      position: relative;
    }

    .nav-link:hover, .nav-link.active {
      color: var(--sand-gold) !important;
    }

    .mega-menu {
      position: absolute;
      top: 80px;
      left: 50%;
      transform: translateX(-50%);
      width: 850px;
      background: var(--pure-white);
      box-shadow: var(--shadow-soft);
      border-radius: 0 0 4px 4px;
      padding: 2rem;
      display: none;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 2rem;
      z-index: 999;
      border: 1px solid var(--border-light);
    }

    .nav-item.dropdown:hover .mega-menu {
      display: grid;
    }

    .mega-menu .menu-card {
      background: transparent;
      padding: 1rem;
      border-radius: var(--border-radius);
      transition: transform var(--transition-base), background var(--transition-base);
    }

    .mega-menu .menu-card:hover {
      background: #fafaf8;
      transform: translateY(-2px);
    }

    /* 汉堡菜单 */
    .navbar-toggler {
      border: none;
      padding: 0;
      background: transparent;
    }

    .navbar-toggler:focus {
      box-shadow: none;
    }

    .hamburger-line {
      width: 24px;
      height: 2px;
      background-color: var(--deep-green);
      margin: 5px 0;
      display: block;
      transition: var(--transition-base);
    }

    /* 区块间距 */
    section {
      padding: 120px 0;
    }

    @media (max-width: 992px) {
      section {
        padding: 80px 0;
      }
      h2 {
        font-size: 36px;
      }
      .navbar-custom {
        padding: 0 1rem;
      }
    }

    /* Hero */
    .hero-section {
      background-color: var(--warm-white);
      position: relative;
      overflow: hidden;
    }

    .hero-title {
      font-size: 56px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--deep-green);
    }

    .hero-visual {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      min-height: 450px;
      border-radius: var(--border-radius);
      opacity: 0.9;
      mix-blend-mode: multiply;
    }

    /* 卡片系统 */
    .card-custom {
      background: var(--pure-white);
      border: 1px solid var(--border-light);
      border-radius: var(--border-radius);
      padding: 32px;
      transition: border-color var(--transition-base), box-shadow var(--transition-base);
      height: 100%;
    }

    .card-custom:hover {
      border-color: var(--deep-green);
      box-shadow: var(--shadow-soft);
    }

    .icon-circle {
      font-size: 2rem;
      color: var(--sand-gold);
      margin-bottom: 1.2rem;
    }

    /* 数字墙 */
    .bg-light-green {
      background-color: #E8EDEB;
    }

    .stat-number {
      font-family: var(--font-serif);
      font-size: 64px;
      font-weight: 700;
      color: var(--sand-gold);
      line-height: 1;
    }

    /* 证言 */
    .testimonial-quote {
      font-family: var(--font-serif);
      font-style: italic;
      font-size: 1.3rem;
      border-left: 4px solid var(--sand-gold);
      padding-left: 2rem;
    }

    /* FAQ手风琴 */
    .accordion-button:not(.collapsed) {
      background-color: transparent;
      color: var(--deep-green);
      box-shadow: none;
    }

    .accordion-button:focus {
      border-color: var(--sand-gold);
      box-shadow: none;
    }

    .accordion-item {
      border-left: none;
      border-right: none;
      border-top: 1px solid var(--border-light);
      background: transparent;
    }

    .accordion-button {
      font-weight: 600;
      font-size: 1.1rem;
      background: transparent;
    }

    /* 表单 */
    .form-control-underline {
      border: none;
      border-bottom: 2px solid var(--deep-green);
      border-radius: 0;
      padding-left: 0;
      background: transparent;
      transition: border-color var(--transition-base);
    }

    .form-control-underline:focus {
      border-bottom-color: var(--sand-gold);
      box-shadow: none;
    }

    /* 页脚 */
    .footer-dark {
      background-color: var(--deep-green);
      color: #C8A96E;
    }

    .footer-dark a {
      color: #D4B87A;
      text-decoration: none;
    }

    .footer-dark a:hover {
      color: #FFFFFF;
    }

    @media (max-width: 768px) {
      .hero-title {
        font-size: 38px;
      }
      .stat-number {
        font-size: 48px;
      }
    }

    .fade-up {
      opacity: 0;
      transform: translateY(20px);
      transition: opacity 0.6s ease, transform 0.6s ease;
    }

    .fade-up.visible {
      opacity: 1;
      transform: translateY(0);
    }