/* roulang page: index */
:root {
      --primary-burgundy: #7B1E3B;
      --primary-burgundy-deep: #5E152D;
      --accent-gold: #C4A265;
      --accent-gold-hover: #B08D4B;
      --dark-slate: #2D2D2D;
      --warm-white: #FAF7F2;
      --pure-white: #FFFFFF;
      --text-gray: #4A4A4A;
      --text-light: #9A9A9A;
      --border-soft: #E5E0D8;
      --border-input: #D4CFC6;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 30px rgba(0,0,0,0.08);
      --shadow-gold: 0 4px 12px rgba(176,141,75,0.4);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-pill: 20px;
      --font-heading: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      --font-body: "Inter", "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-body);
      background-color: var(--warm-white);
      color: var(--text-gray);
      line-height: 1.8;
      margin: 0;
      overflow-x: hidden;
    }
    
    h1, h2, h3, h4, .h1, .h2, .h3, .h4 {
      font-family: var(--font-heading);
      letter-spacing: 0.02em;
    }
    
    h1 {
      font-size: 3.5rem;
      font-weight: 700;
      color: var(--dark-slate);
    }
    
    h2 {
      font-size: 2.25rem;
      font-weight: 600;
      color: var(--dark-slate);
      margin-bottom: 1.5rem;
      position: relative;
      display: inline-block;
    }
    
    .section-title-decoration {
      display: block;
      width: 40px;
      height: 4px;
      background-color: var(--accent-gold);
      margin-top: 0.5rem;
      margin-bottom: 2rem;
    }
    
    h3 {
      font-size: 1.35rem;
      font-weight: 600;
      color: var(--primary-burgundy);
    }
    
    .text-accent {
      color: var(--accent-gold);
      letter-spacing: 0.05em;
      text-transform: uppercase;
      font-size: 0.85rem;
      font-weight: 600;
    }
    
    .bg-warm {
      background-color: var(--warm-white);
    }
    
    .btn {
      border-radius: var(--radius-btn);
      padding: 0.75rem 2rem;
      font-weight: 600;
      transition: all 0.3s ease;
      border: none;
      letter-spacing: 0.02em;
    }
    
    .btn-primary {
      background-color: var(--primary-burgundy);
      color: white;
      border: 2px solid var(--primary-burgundy);
    }
    
    .btn-primary:hover, .btn-primary:focus {
      background-color: var(--accent-gold-hover);
      border-color: var(--accent-gold-hover);
      color: var(--dark-slate);
      box-shadow: var(--shadow-gold);
    }
    
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary-burgundy);
      color: var(--primary-burgundy);
    }
    
    .btn-outline:hover, .btn-outline:focus {
      background-color: var(--primary-burgundy);
      color: white;
      border-color: var(--primary-burgundy);
    }
    
    .btn-gold {
      background-color: var(--accent-gold);
      color: var(--dark-slate);
      font-weight: 700;
      border: none;
    }
    
    .btn-gold:hover {
      background-color: var(--accent-gold-hover);
      color: white;
    }
    
    /* 导航栏 */
    .navbar {
      background-color: var(--pure-white);
      box-shadow: 0 2px 10px rgba(0,0,0,0.04);
      padding: 0.8rem 0;
      z-index: 1000;
    }
    
    .navbar-brand {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary-burgundy) !important;
      letter-spacing: 0.03em;
    }
    
    .nav-pill {
      border-radius: var(--radius-pill);
      padding: 0.4rem 1.2rem;
      margin: 0 0.2rem;
      color: var(--text-gray);
      font-weight: 500;
      transition: all 0.25s ease;
      background: transparent;
      font-size: 0.95rem;
    }
    
    .nav-pill:hover {
      background-color: var(--warm-white);
      color: var(--dark-slate);
    }
    
    .nav-pill.active {
      background-color: var(--primary-burgundy);
      color: white !important;
    }
    
    .navbar-nav .nav-link {
      padding: 0.4rem 1.2rem;
    }
    
    /* Hero */
    .hero-image {
      border-radius: 16px;
      box-shadow: var(--shadow-md);
      width: 100%;
      height: auto;
      object-fit: cover;
      max-height: 450px;
    }
    
    .data-highlight {
      font-size: 2rem;
      font-weight: 700;
      color: var(--primary-burgundy);
      line-height: 1.2;
    }
    
    .data-label {
      font-size: 0.9rem;
      color: var(--text-gray);
    }
    
    /* 卡片 */
    .card-advantage {
      background: var(--pure-white);
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      border: none;
      height: 100%;
    }
    
    .card-advantage:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    
    .icon-circle {
      color: var(--accent-gold);
      font-size: 2.2rem;
      margin-bottom: 1.2rem;
    }
    
    /* 案例瀑布流 */
    .masonry-grid {
      column-count: 3;
      column-gap: 1.5rem;
    }
    
    .masonry-item {
      break-inside: avoid;
      margin-bottom: 1.5rem;
    }
    
    .project-card img {
      border-radius: 10px;
      box-shadow: 0 10px 20px rgba(0,0,0,0.06);
      width: 100%;
      transition: transform 0.3s ease;
    }
    
    .project-card img:hover {
      transform: scale(1.02);
    }
    
    .project-tag {
      color: var(--accent-gold);
      font-size: 0.8rem;
      letter-spacing: 0.05em;
      text-transform: uppercase;
      font-weight: 600;
    }
    
    /* 方案对比表 */
    .plan-card {
      background: var(--pure-white);
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      position: relative;
      height: 100%;
    }
    
    .plan-featured {
      border-top: 4px solid var(--primary-burgundy);
      background-color: #FDF5F7;
    }
    
    .plan-badge {
      background: var(--accent-gold);
      color: var(--dark-slate);
      font-size: 0.75rem;
      padding: 0.25rem 0.8rem;
      border-radius: 20px;
      font-weight: 700;
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
      white-space: nowrap;
    }
    
    /* FAQ */
    .accordion-item {
      border: none;
      border-bottom: 1px solid var(--border-soft);
      background: transparent;
    }
    
    .accordion-button {
      background: var(--warm-white);
      color: var(--dark-slate);
      font-weight: 600;
      font-size: 1.1rem;
      padding: 1.2rem 0;
      box-shadow: none;
      border: none;
    }
    
    .accordion-button::after {
      display: none;
    }
    
    .accordion-button .faq-icon {
      color: var(--accent-gold);
      font-weight: bold;
      margin-right: 1rem;
      font-size: 1.3rem;
    }
    
    .accordion-button:not(.collapsed) {
      background-color: #FDF5F7;
      color: var(--primary-burgundy);
    }
    
    .accordion-body {
      color: var(--text-gray);
      padding: 0.5rem 0 1.5rem 2.5rem;
    }
    
    /* 底部CTA */
    .cta-banner {
      background-color: var(--primary-burgundy);
      border-radius: var(--radius-card);
      color: white;
    }
    
    .form-control {
      border: 1px solid var(--border-input);
      border-radius: 6px;
      padding: 0.7rem 1rem;
      background: white;
      transition: 0.2s;
    }
    
    .form-control:focus {
      border-color: var(--primary-burgundy);
      box-shadow: 0 0 0 0.2rem rgba(123,30,59,0.15);
    }
    
    .footer-dark {
      background-color: var(--dark-slate);
      color: var(--text-light);
    }
    
    /* 移动端调整 */
    @media (max-width: 1024px) {
      h1 { font-size: 2.8rem; }
      .masonry-grid { column-count: 2; }
    }
    
    @media (max-width: 768px) {
      h1 { font-size: 2.2rem; }
      h2 { font-size: 1.8rem; }
      .navbar-nav { text-align: center; }
      .masonry-grid { column-count: 1; }
      .hero-image { margin-top: 2rem; max-height: 350px; }
      .data-highlight { font-size: 1.6rem; }
    }
    
    @media (max-width: 520px) {
      .btn { padding: 0.6rem 1.5rem; font-size: 0.9rem; }
    }