:root {
            --primary-color: #8B4513;
            --secondary-color: #D2B48C;
            --accent-color: #8B0000;
            --light-color: #F5F5DC;
            --dark-color: #333;
            --font-serif: 'Times New Roman', Times, serif;
            --font-sans: Arial, sans-serif;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: var(--font-sans);
            line-height: 1.6;
            color: var(--dark-color);
            background-color: var(--light-color);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        
        header {
            background: linear-gradient(to bottom, var(--primary-color), #6b3300);
            color: white;
            padding: 1.5rem 1rem;
            text-align: center;
            box-shadow: 0 4px 12px rgba(0,0,0,0.2);
            border-bottom: 5px solid var(--secondary-color);
        }
        
        .logo {
            font-family: var(--font-serif);
            font-size: 2.5rem;
            margin-bottom: 0.5rem;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 15px;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
        }
        
        .logo i {
            color: var(--secondary-color);
            filter: drop-shadow(2px 2px 2px rgba(0,0,0,0.3));
        }
        
        .subtitle {
            font-family: var(--font-serif);
            font-size: 1.2rem;
            font-style: italic;
            margin-bottom: 1rem;
            color: var(--secondary-color);
        }
        
        .search-container {
            max-width: 700px;
            margin: 1.5rem auto;
            padding: 0 1rem;
        }
        
        .search-box {
            display: flex;
            gap: 0.5rem;
            background: white;
            padding: 0.7rem;
            border-radius: 8px;
            box-shadow: 0 3px 10px rgba(0,0,0,0.15);
        }
        
        .search-box input, .search-box select {
            padding: 0.8rem;
            border: 1px solid #ddd;
            border-radius: 4px;
            font-size: 1rem;
        }
        
        .search-box input {
            flex: 1;
        }
        
        .search-btn {
            background: linear-gradient(to bottom, var(--accent-color), #6b0000);
            color: white;
            border: none;
            padding: 0.8rem 1.5rem;
            border-radius: 4px;
            cursor: pointer;
            transition: all 0.3s;
            display: flex;
            align-items: center;
            gap: 8px;
            font-weight: bold;
        }
        
        .search-btn:hover {
            background: linear-gradient(to bottom, #a52a2a, #8b0000);
            transform: translateY(-2px);
            box-shadow: 0 4px 8px rgba(0,0,0,0.2);
        }
        
        .ad-container {
            display: flex;
            justify-content: center;
            margin: 1rem auto;
            padding: 0 1rem;
            max-width: 1200px;
        }
        
        .ad-leaderboard {
            background-color: #f8f8f8;
            border: 1px solid #ddd;
            text-align: center;
            padding: 8px;
            margin: 0 auto;
            border-radius: 4px;
            width: 690px; /* 18.3cm */
            height: 87px; /* 2.3cm */
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        .ad-label {
            font-size: 0.8rem;
            color: #666;
            margin-bottom: 5px;
            text-transform: uppercase;
            letter-spacing: 1px;
        }
        
        .ad-sidebar {
            background-color: #f8f8f8;
            border: 1px solid #ddd;
            text-align: center;
            padding: 10px;
            margin: 10px 0;
            border-radius: 4px;
            width: 287px; /* 7.6cm */
            height: 238px; /* 6.3cm */
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
        }
        
        main {
            max-width: 1200px;
            margin: 0 auto;
            padding: 1.5rem;
            display: grid;
            grid-template-columns: 1fr 2fr 1fr;
            gap: 1.5rem;
            flex: 1;
        }
        
        .bible-nav {
            background-color: white;
            padding: 1.5rem;
            border-radius: 8px;
            box-shadow: 0 3px 10px rgba(0,0,0,0.1);
            max-height: 600px;
            overflow-y: auto;
            border: 1px solid #e0d0b0;
        }
        
        .bible-nav h3 {
            margin-bottom: 1.2rem;
            color: var(--primary-color);
            border-bottom: 2px solid var(--secondary-color);
            padding-bottom: 0.7rem;
            display: flex;
            align-items: center;
            gap: 10px;
            font-family: var(--font-serif);
        }
        
        .testament {
            margin-bottom: 1.8rem;
        }
        
        .testament h4 {
            background: linear-gradient(to right, var(--secondary-color), #e6d2b5);
            padding: 0.8rem;
            margin-bottom: 0.8rem;
            border-radius: 4px;
            display: flex;
            align-items: center;
            gap: 10px;
            font-family: var(--font-serif);
            color: var(--dark-color);
            border-left: 4px solid var(--primary-color);
        }
        
        .books {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 0.6rem;
        }
        
        .book {
            padding: 0.6rem 0.4rem;
            cursor: pointer;
            border-radius: 4px;
            text-align: center;
            font-size: 0.9rem;
            transition: all 0.2s;
            border: 1px solid transparent;
        }
        
        .book:hover {
            background-color: #f5f0e6;
            border-color: var(--secondary-color);
        }
        
        .book.active {
            background-color: var(--primary-color);
            color: white;
            transform: scale(1.05);
            box-shadow: 0 3px 6px rgba(0,0,0,0.15);
        }
        
        .bible-content {
            background-color: white;
            padding: 2rem;
            border-radius: 8px;
            box-shadow: 0 3px 10px rgba(0,0,0,0.1);
            min-height: 500px;
            border: 1px solid #e0d0b0;
        }
        
        .verse {
            margin-bottom: 1.2rem;
            font-family: var(--font-serif);
            font-size: 1.15rem;
            line-height: 1.8;
            text-align: justify;
        }
        
        .verse-number {
            font-weight: bold;
            color: var(--accent-color);
            margin-right: 0.5rem;
            font-size: 0.9rem;
            vertical-align: super;
        }
        
        .chapter-nav {
            display: flex;
            justify-content: space-between;
            margin-top: 2.5rem;
            padding-top: 1.5rem;
            border-top: 2px solid #eee;
        }
        
        .chapter-btn {
            background: linear-gradient(to bottom, var(--primary-color), #6b3300);
            color: white;
            border: none;
            padding: 0.8rem 1.5rem;
            border-radius: 4px;
            cursor: pointer;
            display: flex;
            align-items: center;
            gap: 10px;
            transition: all 0.3s;
            font-weight: bold;
        }
        
        .chapter-btn:hover {
            background: linear-gradient(to bottom, #9c5c2a, #8B4513);
            transform: translateY(-2px);
            box-shadow: 0 4px 8px rgba(0,0,0,0.2);
        }
        
        .chapter-btn:disabled {
            background: #cccccc;
            cursor: not-allowed;
            transform: none;
            box-shadow: none;
        }
        
        .tools {
            background-color: white;
            padding: 1.5rem;
            border-radius: 8px;
            box-shadow: 0 3px 10px rgba(0,0,0,0.1);
            max-height: 600px;
            overflow-y: auto;
            border: 1px solid #e0d0b0;
        }
        
        .tools h3 {
            margin-bottom: 1.2rem;
            color: var(--primary-color);
            border-bottom: 2px solid var(--secondary-color);
            padding-bottom: 0.7rem;
            display: flex;
            align-items: center;
            gap: 10px;
            font-family: var(--font-serif);
        }
        
        .bookmark-btn, .highlight-btn {
            background: linear-gradient(to bottom, var(--secondary-color), #c9b28a);
            border: none;
            padding: 0.9rem;
            border-radius: 4px;
            cursor: pointer;
            width: 100%;
            margin-bottom: 0.9rem;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            transition: all 0.3s;
            font-weight: bold;
        }
        
        .bookmark-btn:hover, .highlight-btn:hover {
            background: linear-gradient(to bottom, #d8c4a8, var(--secondary-color));
            transform: translateY(-2px);
            box-shadow: 0 4px 8px rgba(0,0,0,0.15);
        }
        
        .bookmark-item {
            padding: 0.9rem;
            border-bottom: 1px solid #eee;
            cursor: pointer;
            transition: background-color 0.2s;
            border-left: 3px solid transparent;
        }
        
        .bookmark-item:hover {
            background-color: #f9f9f9;
            border-left-color: var(--secondary-color);
        }
        
        .remove-bookmark {
            background: none;
            border: none;
            color: var(--accent-color);
            cursor: pointer;
            float: right;
            font-size: 1.2rem;
            transition: transform 0.2s;
        }
        
        .remove-bookmark:hover {
            transform: scale(1.2);
        }
        
        footer {
            background: linear-gradient(to bottom, #6b3300, var(--primary-color));
            color: white;
            text-align: center;
            padding: 1.8rem;
            margin-top: 2.5rem;
            border-top: 5px solid var(--secondary-color);
        }
        
        .footer-content {
            max-width: 800px;
            margin: 0 auto;
        }
        
        .loading {
            text-align: center;
            padding: 3rem;
            color: var(--primary-color);
        }
        
        .loading i {
            font-size: 2rem;
            margin-bottom: 1rem;
        }
        
        .error {
            text-align: center;
            padding: 3rem;
            color: var(--accent-color);
        }
        
        .error i {
            font-size: 2rem;
            margin-bottom: 1rem;
        }
        
        @media (max-width: 900px) {
            main {
                grid-template-columns: 1fr 2fr;
            }
            
            .tools {
                grid-column: 1 / span 2;
            }
            
            .ad-sidebar {
                display: none;
            }
        }
        
        @media (max-width: 768px) {
            main {
                grid-template-columns: 1fr;
                gap: 1rem;
                padding: 1rem;
            }
            
            .tools {
                grid-column: 1;
            }
            
            .books {
                grid-template-columns: repeat(4, 1fr);
            }
            
            .logo {
                font-size: 2rem;
            }
            
            .ad-container {
                flex-direction: column;
                align-items: center;
            }
            
            .ad-leaderboard {
                margin: 5px 0;
                width: 100%;
                max-width: 690px;
                height: 87px;
            }
        }
        
        @media (max-width: 480px) {
            .books {
                grid-template-columns: repeat(3, 1fr);
                font-size: 0.8rem;
            }
            
            .search-box {
                flex-direction: column;
            }
            
            .logo {
                font-size: 1.8rem;
                flex-direction: column;
                gap: 5px;
            }
            
            .bible-content {
                padding: 1.5rem;
            }
            
            .verse {
                font-size: 1rem;
            }
            
            .ad-leaderboard {
                height: 87px;
            }
        }