@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');
        @import url('https://fonts.googleapis.com/css2?family=Crimson+Text:ital,wght@0,400;0,600;1,400&display=swap');
        
        html {
            scroll-behavior: smooth;
        }
        :root {
            --primary-color: #6366f1;
            --primary-dark: #4f46e5;
            --secondary-color: #f1f5f9;
            --accent-color: #06b6d4;
            --text-primary: #1e293b;
            --text-secondary: #64748b;
            --bg-primary: #ffffff;
            --bg-secondary: #f8fafc;
            --bg-card: #ffffff;
            --border-color: #e2e8f0;
            --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
            --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
            --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
            --highlight-yellow: #fef3c7;
            --highlight-green: #dcfce7;
            --highlight-blue: #dbeafe;
            --highlight-pink: #fce7f3;
            --highlight-orange: #fed7aa;
        }
        
        [data-theme="dark"] {
            --text-primary: #f1f5f9;
            --text-secondary: #94a3b8;
            --bg-primary: #0f172a;
            --bg-secondary: #1e293b;
            --bg-card: #334155;
            --border-color: #475569;
            --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
            --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.2), 0 2px 4px -2px rgb(0 0 0 / 0.2);
            --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.3), 0 4px 6px -4px rgb(0 0 0 / 0.3);
            --highlight-yellow: #713f12;
            --highlight-green: #14532d;
            --highlight-blue: #1e3a8a;
            --highlight-pink: #831843;
            --highlight-orange: #9a3412;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
            background: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.6;
            transition: background-color 0.3s ease, color 0.3s ease;
            min-height: 100vh;
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1rem;
        }
        
        /* Header */
        .header {
            background: var(--bg-card);
            border-bottom: 1px solid var(--border-color);
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: var(--shadow-sm);
        }
        
        .header-content {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 1rem;
        }
        
        .logo {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-weight: 700;
            font-size: 1.25rem;
            color: var(--primary-color);
        }
        
        .header-controls {
            display: flex;
            align-items: center;
            gap: 1rem;
        }
        
        .search-container {
            position: relative;
            flex: 1;
            max-width: 400px;
        }
        
        .search-input {
            width: 100%;
            padding: 0.75rem 1rem 0.75rem 2.5rem;
            border: 1px solid var(--border-color);
            border-radius: 0.5rem;
            background: var(--bg-primary);
            color: var(--text-primary);
            font-size: 0.875rem;
            transition: all 0.2s ease;
        }
        
        .search-input:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgb(99 102 241 / 0.1);
        }
        
        .search-icon {
            position: absolute;
            left: 0.75rem;
            top: 50%;
            transform: translateY(-50%);
            color: var(--text-secondary);
        }
        
        .controls-toggle-btn {
            display: none;
            padding: 0.75rem 1.5rem;
            border: none;
            border-radius: 0.5rem;
            font-weight: 500;
            font-size: 0.875rem;
            cursor: pointer;
            transition: all 0.2s ease;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
        }
        
        .controls-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
            gap: 1rem;
            margin: 1.5rem 0;
            padding: 1.5rem;
            background: var(--bg-card);
            border-radius: 0.75rem;
            box-shadow: var(--shadow-md);
        }
        
        .controls-grid {
            display: block;
            transition: max-height 0.3s, opacity 0.3s;
            max-height: 1000px;
            opacity: 1;
            overflow: hidden;
        }
        
        .controls-grid.hidden {
            max-height: 0;
            opacity: 0;
            pointer-events: none;
        }
        
        .form-group {
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
        }
        
        .form-label {
            font-weight: 500;
            font-size: 0.875rem;
            color: var(--text-secondary);

        }
        
        .form-select {
            padding: 0.75rem;
            border: 1px solid var(--border-color);
            border-radius: 0.5rem;
            background: var(--bg-primary);
            color: var(--text-primary);
            font-size: 0.875rem;
            cursor: pointer;
            transition: all 0.2s ease;
        }
        
        .form-select:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgb(99 102 241 / 0.1);
        }
        
        .btn {
            padding: 0.75rem 1.5rem;
            border: none;
            border-radius: 0.5rem;
            font-weight: 500;
            font-size: 0.875rem;
            cursor: pointer;
            transition: all 0.2s ease;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
        }
        
        .btn-primary {
            background: var(--primary-color);
            color: white;
        }
        
        .btn-primary:hover {
            background: var(--primary-dark);
        }
        
        .btn-secondary {
            background: var(--bg-secondary);
            color: var(--text-primary);
            border: 1px solid var(--border-color);
        }
        
        .btn-secondary:hover {
            background: var(--border-color);
        }
        
        .btn-icon {
            padding: 0.75rem;
            border-radius: 0.5rem;
            background: transparent;
            color: var(--text-secondary);
            border: 1px solid var(--border-color);
            cursor: pointer;
            transition: all 0.2s ease;
        }
        
        .btn-icon:hover {
            background: var(--bg-secondary);
            color: var(--text-primary);
        }
        
        .content-area {
            display: grid;
            grid-template-columns: 1fr;
            gap: .5rem;
            margin: .2rem 0;
        }
        
        @media (min-width: 1024px) {
            .content-area {
                grid-template-columns: 1fr 300px;
            }
        }
        
        .main-content {
            background: var(--bg-card);
            border-radius: 0.75rem;
            padding: 2rem;
            box-shadow: var(--shadow-md);
            min-height: 500px;
        }
        
        .sidebar {
            background: var(--bg-card);
            border-radius: 0.75rem;
            padding: 1.5rem;
            box-shadow: var(--shadow-md);
            height: fit-content;
        }
        
        .verse-content {
            font-family: 'Crimson Text', serif;
            font-size: 1.1rem;
            line-height: 1.8;
            color: var(--text-primary);
        }
        
        .verse-number {
            font-weight: 600;
            color: var(--primary-color);
            margin-right: 0.5rem;
            font-size: 0.9rem;
            vertical-align: super;
        }
        
        .verse-text {
            cursor: pointer;
            padding: 0.25rem 0;
            border-radius: 0.25rem;
            transition: all 0.2s ease;
        }
        
        .verse-text:hover {
            background: var(--bg-secondary);
        }
        
        .verse-text.selected {
            background: var(--highlight-blue);
            box-shadow: 0 0 0 2px var(--primary-color);
        }
        
        .highlight-yellow { background: var(--highlight-yellow) !important; }
        .highlight-green { background: var(--highlight-green) !important; }
        .highlight-blue { background: var(--highlight-blue) !important; }
        .highlight-pink { background: var(--highlight-pink) !important; }
        .highlight-orange { background: var(--highlight-orange) !important; }
        
        .highlight-controls {
            margin-bottom: 1rem;
            padding: 1rem;
            background: var(--bg-secondary);
            border-radius: 0.5rem;
            display: none;
        }
        
        .highlight-controls.show {
            display: block;
        }
        
        .color-picker {
            display: flex;
            gap: 0.5rem;
            margin-top: 0.5rem;
        }
        
        .color-option {
            width: 2rem;
            height: 2rem;
            border-radius: 0.25rem;
            cursor: pointer;
            border: 2px solid transparent;
            transition: all 0.2s ease;
        }
        
        .color-option:hover,
        .color-option.selected {
            border-color: var(--text-primary);
            transform: scale(1.1);
        }
        
        .welcome-text {
            text-align: center;
            color: var(--text-secondary);
            font-size: 1.125rem;
            margin-top: 2rem;
        }
        
        .offline-status {
            position: fixed;
            top: 4rem;
            right: 1rem;
            background: var(--accent-color);
            color: white;
            padding: 0.5rem 1rem;
            border-radius: 0.5rem;
            font-size: 0.875rem;
            box-shadow: var(--shadow-lg);
            display: none;
        }
        
        .offline-status.show {
            display: block;
        }
        
        .search-results {
            max-height: 300px;
            overflow-y: auto;
            border: 1px solid var(--border-color);
            border-top: none;
            background: var(--bg-card);
            border-radius: 0 0 0.5rem 0.5rem;
            position: absolute;
            width: 100%;
            z-index: 50;
            display: none;
        }
        
        .search-result-item {
            padding: 0.75rem;
            border-bottom: 1px solid var(--border-color);
            cursor: pointer;
            transition: background-color 0.2s ease;
        }
        
        .search-result-item:hover {
            background: var(--bg-secondary);
        }
        
        .search-result-reference {
            font-weight: 500;
            color: var(--primary-color);
            font-size: 0.875rem;
        }
        
        .search-result-text {
            color: var(--text-secondary);
            font-size: 0.875rem;
            margin-top: 0.25rem;
        }
        
        .back-to-top {
            position: fixed;
            bottom: 2rem;
            right: 2rem;
            background: var(--primary-color);
            color: white;
            width: 3rem;
            height: 3rem;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            opacity: 0;
            transition: all 0.3s ease;
            box-shadow: var(--shadow-lg);
        }
        
        .back-to-top.show {
            opacity: 1;
        }
        
        .back-to-top:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
        }
        
        .chapter-info {
            text-align: center;
            margin-bottom: 2rem;
            padding: 1rem;
            background: var(--bg-secondary);
            border-radius: 0.5rem;
        }
        
        .chapter-title {
            font-size: 1.5rem;
            font-weight: 600;
            color: var(--primary-color);
            margin-bottom: 0.5rem;
        }
        
        .chapter-subtitle {
            color: var(--text-secondary);
            font-size: 0.875rem;
        }
        
        /* Mobile optimizations */
        @media (max-width: 768px) {
            .container {
                max-width: 100vw;
                box-sizing: border-box;
            }
            .content-area {
                width: 100%;
                box-sizing: border-box;
                overflow-x: hidden;
            }
            .main-content {
                padding: 0.5rem;
                min-width: 0;
                width: 100%;
                box-sizing: border-box;
            }
            .verse-content {
                font-size: 1rem;
                line-height: 1.7;
                overflow-wrap: break-word;
                word-break: break-word;
            }
            .controls-toggle-btn {
                display: block;
                width: 100%;
                margin-bottom: 0;
                padding: 10px;
                font-size: 15px;
            }
            .controls-grid {
                display: block;
                max-height: 1000px;
                opacity: 1;
                overflow: hidden;
                transition: max-height 0.4s cubic-bezier(.4,0,.2,1), opacity 0.4s cubic-bezier(.4,0,.2,1);
                will-change: max-height, opacity;
                scroll-margin-top: 80px; /* para scroll suave */
            }
            .controls-grid.hidden {
                max-height: 0;
                opacity: 0;
                pointer-events: none;
            }
        }
        @media (min-width: 769px) {
            .controls-toggle-btn {
                display: none;
            }
        }
        
        @media (max-width: 480px) {
             .controls-grid {
                display: grid;
                grid-template-columns: repeat(auto-fit, minmax(150px, 2fr));
                gap: .5rem;
                margin: .2rem 0;
                padding: 1.5rem;
                background: var(--bg-card);
                border-radius: 0.75rem;
                box-shadow: var(--shadow-md);
            }
            .form-group:last-child {
                grid-column: 1 / -1;
            }
        }
        
        .loading {
            display: inline-block;
            width: 1rem;
            height: 1rem;
            border: 2px solid var(--border-color);
            border-radius: 50%;
            border-top-color: var(--primary-color);
            animation: spin 1s linear infinite;
        }
        
        @keyframes spin {
            to { transform: rotate(360deg); }
        }