/* roulang page: index */
:root {
      --primary-charcoal: #2C2C2C;
      --deep-charcoal: #1E1E1E;
      --accent-gold: #C5A47E;
      --accent-gold-hover: #A88968;
      --bg-warm: #F9F6F1;
      --white: #FFFFFF;
      --lake-green: #4A6B5F;
      --text-muted: #6B6B6B;
      --border-light: rgba(0,0,0,0.04);
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 30px rgba(0,0,0,0.08);
      --border-radius-card: 16px;
      --border-radius-btn: 50px;
      --font-sans: 'Inter', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      --transition-smooth: all 0.3s ease;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--primary-charcoal);
      font-weight: 400;
      line-height: 1.8;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
      letter-spacing: 0.01em;
    }
    
    h1, h2, h3, h4, h5 {
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.2;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-smooth);
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    /* 覆盖 Bootstrap 默认 */
    .btn {
      border-radius: var(--border-radius-btn);
      padding: 12px 32px;
      font-weight: 600;
      letter-spacing: 0.02em;
      transition: var(--transition-smooth);
      border: 1px solid transparent;
    }
    .btn-primary-custom {
      background-color: var(--accent-gold);
      border-color: var(--accent-gold);
      color: white;
    }
    .btn-primary-custom:hover, .btn-primary-custom:focus {
      background-color: var(--accent-gold-hover);
      border-color: var(--accent-gold-hover);
      color: white;
      box-shadow: 0 8px 18px rgba(197, 164, 126, 0.25);
    }
    .btn-outline-custom {
      background: transparent;
      border: 1px solid var(--accent-gold);
      color: var(--accent-gold);
    }
    .btn-outline-custom:hover {
      background: var(--accent-gold);
      color: white;
    }
    
    .container-custom {
      max-width: 1280px;
      margin: 0 auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    
    /* 浮动 Dock 导航 */
    .floating-nav {
      position: fixed;
      top: 20px;
      left: 50%;
      transform: translateX(-50%);
      width: auto;
      max-width: 1100px;
      z-index: 1050;
      background: rgba(255, 255, 255, 0.8);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-radius: 40px;
      padding: 10px 28px;
      box-shadow: 0 8px 28px rgba(0,0,0,0.06);
      border: 1px solid rgba(255,255,255,0.5);
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: var(--transition-smooth);
    }
    .logo-text {
      font-weight: 700;
      font-size: 1.6rem;
      letter-spacing: -0.02em;
      color: var(--primary-charcoal);
    }
    .logo-text span {
      color: var(--accent-gold);
    }
    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--primary-charcoal);
    }
    .nav-links a {
      position: relative;
      padding: 6px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--accent-gold);
      transition: width 0.25s ease;
    }
    .nav-links a:hover::after, .nav-links a.active::after {
      width: 100%;
    }
    .nav-cta {
      background: var(--accent-gold);
      color: white !important;
      padding: 8px 22px !important;
      border-radius: 30px;
      font-weight: 600;
    }
    .nav-cta:hover {
      background: var(--accent-gold-hover);
    }
    
    /* 移动端导航 */
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.6rem;
      color: var(--primary-charcoal);
    }
    
    /* Hero */
    .hero-section {
      padding: 140px 0 80px;
      background-color: var(--deep-charcoal);
      color: white;
      position: relative;
      overflow: hidden;
    }
    .hero-bg-img {
      position: absolute;
      right: 0;
      top: 0;
      width: 48%;
      height: 100%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.35;
      mask-image: radial-gradient(circle at center, black 30%, transparent 80%);
    }
    .hero-title {
      font-size: 4rem;
      font-weight: 700;
      letter-spacing: -0.03em;
      line-height: 1.1;
      margin-bottom: 1.5rem;
    }
    .hero-title .gold {
      color: var(--accent-gold);
    }
    .hero-sub {
      font-size: 1.25rem;
      opacity: 0.85;
      max-width: 520px;
      margin-bottom: 2.5rem;
      font-weight: 300;
    }
    
    /* 亮点网格 */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .highlight-card {
      background: transparent;
      padding: 20px 8px;
      text-align: left;
      border: none;
    }
    .highlight-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--primary-charcoal);
      letter-spacing: -0.02em;
    }
    .highlight-label {
      color: var(--text-muted);
      font-weight: 400;
    }
    
    /* 案例瀑布流 */
    .masonry-grid {
      column-count: 3;
      column-gap: 24px;
    }
    .masonry-item {
      break-inside: avoid;
      margin-bottom: 24px;
      border-radius: var(--border-radius-card);
      overflow: hidden;
      background: white;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-smooth);
    }
    .masonry-item:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .masonry-img {
      width: 100%;
      height: auto;
      display: block;
      aspect-ratio: 4/3;
      object-fit: cover;
    }
    .masonry-caption {
      padding: 18px;
      background: white;
    }
    .masonry-tag {
      color: var(--lake-green);
      font-size: 0.8rem;
      font-weight: 600;
      background: rgba(74,107,95,0.08);
      padding: 2px 12px;
      border-radius: 20px;
    }
    
    /* 方案对比视觉化 */
    .compare-card {
      background: white;
      border-radius: 28px;
      padding: 32px;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-light);
    }
    .compare-highlight {
      color: var(--accent-gold);
      font-weight: 700;
    }
    
    /* FAQ */
    .accordion-button {
      font-weight: 600;
      background: transparent;
      box-shadow: none;
      border-left: 3px solid transparent;
      transition: 0.25s;
    }
    .accordion-button:not(.collapsed) {
      background-color: rgba(249,246,241,0.7);
      border-left: 3px solid var(--accent-gold);
      color: var(--primary-charcoal);
    }
    
    /* Footer */
    .footer-cta {
      background: var(--deep-charcoal);
      color: white;
    }
    .footer-main {
      background: var(--primary-charcoal);
      color: #ccc;
    }
    
    @media (max-width: 992px) {
      .hero-title { font-size: 2.8rem; }
      .highlights-grid { grid-template-columns: repeat(2, 1fr); }
      .masonry-grid { column-count: 2; }
    }
    @media (max-width: 768px) {
      .floating-nav {
        width: 92%;
        padding: 10px 20px;
      }
      .nav-links { display: none; }
      .mobile-menu-toggle { display: block; }
      .hero-bg-img { width: 100%; opacity: 0.2; }
      .highlights-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 576px) {
      .hero-title { font-size: 2.2rem; }
      .masonry-grid { column-count: 1; }
      .highlights-grid { grid-template-columns: 1fr; }
    }