/* roulang page: index */
:root {
      --deep-brown: #3E2C1F;
      --bronze-gold: #C49A6C;
      --bronze-dark: #A87D4B;
      --warm-white: #FBF7F2;
      --pure-white: #FFFFFF;
      --soft-brown: #5C4A3A;
      --light-gold-bg: rgba(196, 154, 108, 0.08);
      --border-light: #DDD6CC;
      --shadow-sm: 0 2px 12px rgba(62, 44, 31, 0.06);
      --shadow-md: 0 8px 24px rgba(62, 44, 31, 0.12);
      --text-muted: #7A6A5A;
      --footer-text: #D6CEC4;
      --radius-card: 12px;
      --radius-btn: 8px;
      --transition: all 0.25s ease;
      --font-heading: 'Noto Serif SC', 'Songti SC', 'SimSun', serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-body);
      background-color: var(--warm-white);
      color: #2E241A;
      line-height: 1.8;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }

    h1, h2, h3, h4, .font-heading {
      font-family: var(--font-heading);
      font-weight: 700;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

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

    .container-custom {
      width: 100%;
      max-width: 1240px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 导航栏 SaaS 命令栏风格 */
    .navbar-custom {
      position: sticky;
      top: 0;
      z-index: 1050;
      background: rgba(251, 247, 242, 0.85);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      border-bottom: 1px solid rgba(196, 154, 108, 0.15);
      height: 72px;
      display: flex;
      align-items: center;
      padding: 0 20px;
    }

    .nav-logo {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--deep-brown);
      display: flex;
      align-items: center;
      gap: 8px;
      white-space: nowrap;
    }

    .nav-logo i {
      color: var(--bronze-gold);
      font-size: 1.8rem;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
      margin-left: auto;
      margin-right: 1.5rem;
      font-weight: 500;
      color: #4E3E30;
    }

    .nav-links a {
      position: relative;
      padding: 0.25rem 0;
      font-size: 0.95rem;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--bronze-gold);
      transition: width 0.25s ease;
    }

    .nav-links a:hover {
      color: var(--deep-brown);
    }

    .nav-links a:hover::after {
      width: 100%;
    }

    .search-box {
      display: flex;
      align-items: center;
      background: #F0EBE4;
      border-radius: 20px;
      padding: 0.35rem 1rem;
      margin-right: 1.2rem;
      color: #7A6A5A;
    }

    .search-box i {
      font-size: 0.9rem;
      margin-right: 6px;
    }

    .search-box input {
      border: none;
      background: transparent;
      outline: none;
      font-size: 0.9rem;
      width: 120px;
    }

    .btn-primary-custom {
      background: var(--bronze-gold);
      border: none;
      color: white;
      padding: 0.55rem 1.8rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
      white-space: nowrap;
    }

    .btn-primary-custom:hover {
      background: var(--bronze-dark);
      color: white;
    }

    .btn-outline-custom {
      background: transparent;
      border: 1.5px solid var(--bronze-gold);
      color: var(--bronze-gold);
      padding: 0.55rem 1.8rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
    }

    .btn-outline-custom:hover {
      background: var(--light-gold-bg);
      color: var(--bronze-dark);
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--deep-brown);
    }

    /* hero */
    .hero-section {
      padding: 4rem 0 5rem;
    }

    .hero-title {
      font-size: 42px;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: var(--deep-brown);
      line-height: 1.3;
    }

    .hero-sub {
      font-size: 18px;
      color: var(--text-muted);
      margin: 1.5rem 0 2rem;
    }

    /* 板块间距 */
    section {
      padding: 100px 0;
    }

    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--deep-brown);
      margin-bottom: 1rem;
      text-align: center;
    }

    .card-custom {
      background: var(--pure-white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      height: 100%;
      border: 1px solid rgba(196,154,108,0.08);
    }

    .card-custom:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .icon-circle {
      font-size: 48px;
      color: var(--bronze-gold);
      margin-bottom: 1.5rem;
    }

    .deep-bg {
      background: linear-gradient(135deg, #3E2C1F 0%, #2E1F14 100%);
      color: white;
    }

    .testimonial-card {
      background: rgba(255,255,255,0.06);
      backdrop-filter: blur(4px);
      border-radius: 16px;
      padding: 2rem;
      color: #F5EFE6;
    }

    .price-card {
      border: 1px solid #E8DFD4;
    }

    .price-card.recommended {
      border: 2px solid var(--bronze-gold);
      position: relative;
    }

    .badge-recommend {
      position: absolute;
      top: -12px;
      right: 20px;
      background: var(--bronze-gold);
      color: white;
      padding: 0.2rem 1.2rem;
      border-radius: 20px;
      font-size: 0.8rem;
    }

    .accordion-button:not(.collapsed) {
      background-color: rgba(196,154,108,0.1);
      color: var(--deep-brown);
      box-shadow: none;
    }

    .accordion-button:focus {
      border-color: var(--bronze-gold);
      box-shadow: 0 0 0 0.2rem rgba(196,154,108,0.25);
    }

    .form-control:focus {
      border-color: var(--bronze-gold);
      box-shadow: 0 0 0 0.2rem rgba(196,154,108,0.2);
    }

    footer {
      background: var(--deep-brown);
      color: var(--footer-text);
      padding: 3rem 0 1.5rem;
    }

    @media (max-width: 992px) {
      .nav-links, .search-box {
        display: none;
      }
      .mobile-menu-toggle {
        display: block;
        margin-left: auto;
      }
      .hero-title {
        font-size: 32px;
      }
    }

    @media (max-width: 768px) {
      .hero-title {
        font-size: 28px;
      }
      section {
        padding: 60px 0;
      }
    }