/* roulang page: index */
:root {
      --mk-black: #1A1A1A;
      --mk-dark-gray: #2A2A2A;
      --mk-orange: #FF5500;
      --mk-orange-hover: #E04E00;
      --mk-light-gray: #F2F2F2;
      --mk-bg-light: #FAFAFA;
      --mk-card-bg: #FFFFFF;
      --mk-border-light: rgba(0,0,0,0.06);
      --mk-border-dark: rgba(255,255,255,0.08);
      --mk-text-body: #4A4A4A;
      --mk-text-muted: #7A7A7A;
      --mk-shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
      --mk-shadow-md: 0 6px 16px rgba(0,0,0,0.06);
      --mk-shadow-lg: 0 12px 24px rgba(0,0,0,0.08);
      --mk-radius-card: 12px;
      --mk-radius-btn: 8px;
      --mk-radius-pill: 40px;
      --mk-font-heading: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --mk-font-body: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --mk-font-data: 'Inter', 'SF Pro Text', 'Segoe UI', system-ui, sans-serif;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--mk-font-body);
      background-color: var(--mk-bg-light);
      color: var(--mk-text-body);
      line-height: 1.7;
      font-weight: 400;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      padding-top: 90px; /* offset for fixed floating nav */
    }
    
    h1, h2, h3, h4, .h1, .h2, .h3, .h4 {
      font-family: var(--mk-font-heading);
      font-weight: 700;
      letter-spacing: -0.02em;
      color: var(--mk-black);
    }
    
    h1 {
      font-size: 52px;
      line-height: 1.2;
    }
    
    h2 {
      font-size: 34px;
      margin-bottom: 1rem;
    }
    
    h3 {
      font-size: 22px;
      font-weight: 700;
    }
    
    .text-body {
      color: var(--mk-text-body);
      font-size: 16px;
    }
    
    .text-muted {
      color: var(--mk-text-muted);
    }
    
    .lead {
      font-size: 18px;
      color: var(--mk-text-muted);
    }
    
    a {
      color: var(--mk-orange);
      text-decoration: none;
      transition: color 0.2s;
    }
    a:hover {
      color: var(--mk-orange-hover);
    }
    
    /* Floating Dock Navigation */
    .navbar-float {
      position: fixed;
      top: 16px;
      left: 50%;
      transform: translateX(-50%);
      z-index: 1050;
      width: auto;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border: 1px solid var(--mk-border-light);
      border-radius: var(--mk-radius-pill);
      padding: 8px 28px;
      box-shadow: var(--mk-shadow-sm);
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 2rem;
      transition: all 0.25s ease;
    }
    
    .navbar-float .logo {
      font-family: var(--mk-font-heading);
      font-weight: 800;
      font-size: 24px;
      color: var(--mk-black);
      letter-spacing: -0.02em;
      white-space: nowrap;
    }
    .navbar-float .logo span {
      color: var(--mk-orange);
    }
    
    .nav-links {
      display: flex;
      gap: 1.5rem;
      align-items: center;
    }
    .nav-links a {
      color: var(--mk-dark-gray);
      font-weight: 500;
      font-size: 15px;
      text-decoration: none;
      transition: color 0.2s;
      white-space: nowrap;
    }
    .nav-links a:hover {
      color: var(--mk-orange);
    }
    
    .btn-primary-mk {
      background: var(--mk-orange);
      border: none;
      color: white;
      font-weight: 600;
      border-radius: var(--mk-radius-btn);
      padding: 10px 24px;
      font-size: 15px;
      transition: background 0.2s ease, transform 0.1s;
      white-space: nowrap;
    }
    .btn-primary-mk:hover {
      background: var(--mk-orange-hover);
      color: white;
    }
    
    .btn-outline-mk {
      background: transparent;
      border: 1.5px solid var(--mk-orange);
      color: var(--mk-orange);
      font-weight: 600;
      border-radius: var(--mk-radius-btn);
      padding: 10px 24px;
      font-size: 15px;
      transition: all 0.2s ease;
    }
    .btn-outline-mk:hover {
      background: rgba(255,85,0,0.1);
      border-color: var(--mk-orange-hover);
      color: var(--mk-orange-hover);
    }
    
    /* Mobile menu toggle */
    .navbar-toggler-mk {
      background: transparent;
      border: none;
      font-size: 24px;
      color: var(--mk-dark-gray);
      display: none;
    }
    
    /* Sections */
    .section {
      padding: 90px 0;
    }
    .section-dark {
      background-color: var(--mk-black);
      color: white;
    }
    .section-dark h2, .section-dark h3 {
      color: white;
    }
    
    /* Hero */
    .hero-bg {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .hero-overlay {
      background: rgba(26,26,26,0.75);
      backdrop-filter: blur(2px);
    }
    
    /* Cards */
    .card-mk {
      background: var(--mk-card-bg);
      border: 1px solid var(--mk-border-light);
      border-radius: var(--mk-radius-card);
      padding: 28px 24px;
      box-shadow: var(--mk-shadow-sm);
      transition: transform 0.25s ease, box-shadow 0.25s ease;
      height: 100%;
    }
    .card-mk:hover {
      transform: translateY(-4px);
      box-shadow: var(--mk-shadow-md);
    }
    
    .feature-icon {
      font-size: 42px;
      color: var(--mk-orange);
      margin-bottom: 1rem;
    }
    
    .scenario-card {
      background: #F7F7F7;
      border-radius: 16px;
      padding: 40px;
      border: 1px solid rgba(0,0,0,0.04);
    }
    
    .case-number {
      font-family: var(--mk-font-data);
      font-weight: 700;
      font-size: 2.8rem;
      color: var(--mk-orange);
    }
    
    .pricing-card {
      border-radius: var(--mk-radius-card);
      padding: 32px 24px;
      background: white;
      border: 1px solid var(--mk-border-light);
      box-shadow: var(--mk-shadow-sm);
      height: 100%;
      display: flex;
      flex-direction: column;
    }
    .pricing-highlight {
      border-top: 4px solid var(--mk-orange);
      background: #FFF9F5;
    }
    
    /* Accordion */
    .accordion-button:not(.collapsed) {
      background-color: white;
      color: var(--mk-orange);
      font-weight: 700;
      box-shadow: none;
    }
    .accordion-button:focus {
      border-color: var(--mk-orange);
      box-shadow: 0 0 0 3px rgba(255,85,0,0.15);
    }
    
    /* Form */
    .form-control:focus {
      border-color: var(--mk-orange);
      box-shadow: 0 0 0 3px rgba(255,85,0,0.15);
    }
    
    footer {
      background: var(--mk-black);
      color: #ccc;
    }
    footer a {
      color: #ddd;
    }
    footer a:hover {
      color: var(--mk-orange);
    }
    
    /* Responsive */
    @media (max-width: 992px) {
      h1 { font-size: 42px; }
      h2 { font-size: 30px; }
      .navbar-float {
        padding: 8px 20px;
        gap: 1rem;
      }
      .nav-links {
        gap: 1rem;
      }
    }
    
    @media (max-width: 768px) {
      body {
        padding-top: 80px;
      }
      h1 { font-size: 36px; }
      h2 { font-size: 28px; }
      .navbar-float {
        width: calc(100% - 32px);
        left: 16px;
        transform: none;
        border-radius: 32px;
        justify-content: space-between;
      }
      .nav-links {
        display: none;
      }
      .navbar-toggler-mk {
        display: block;
      }
      .mobile-menu {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0,0,0,0.85);
        backdrop-filter: blur(12px);
        z-index: 1060;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 2rem;
      }
      .mobile-menu a {
        color: white;
        font-size: 22px;
        font-weight: 600;
      }
      .scenario-card {
        padding: 24px;
      }
    }