/* Reset & Variables */
:root {
    /* Light Theme */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --accent-primary: #4361ee;
    --accent-secondary: #3a0ca3;
    --success: #2ecc71;
    --warning: #f39c12;
    --danger: #e74c3c;
    --border: #dee2e6;
    --shadow: 0 4px 12px rgba(0,0,0,0.1);
    --radius: 12px;
    --transition: all 0.3s ease;
}

[data-theme="dark"] {
    --bg-primary: #1a1a2e;
    --bg-secondary: #16213e;
    --bg-tertiary: #0f3460;
    --text-primary: #f8f9fa;
    --text-secondary: #adb5bd;
    --accent-primary: #4cc9f0;
    --accent-secondary: #4361ee;
    --border: #2d3748;
    --shadow: 0 4px 12px rgba(0,0,0,0.3);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: var(--transition);
    min-height: 100vh;
}

/* App Container */
.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.app-header {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    padding: 1.5rem 0;
    border-radius: 0 0 var(--radius) var(--radius);
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.header-content h1 {
    font-size: 2.2rem;
    font-weight: 700;
}

.subtitle {
    font-size: 1rem;
    opacity: 0.9;
}

.header-actions {
    display: flex;
    gap: 0.5rem;
}

/* Buttons */
.btn-icon, .btn-primary, .btn-secondary, .btn-export {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-icon {
    width: 40px;
    height: 40px;
    padding: 0;
    background: rgba(255,255,255,0.2);
    color: white;
    font-size: 1.2rem;
}

.btn-icon:hover {
    background: rgba(255,255,255,0.3);
    transform: translateY(-2px);
}

.btn-primary {
    background: var(--accent-primary);
    color: white;
    font-size: 1.1rem;
}

.btn-primary:hover {
    background: var(--accent-secondary);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: var(--border);
    transform: translateY(-2px);
}

.btn-export {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 2px solid var(--border);
}

.btn-export:hover {
    background: var(--bg-tertiary);
    border-color: var(--accent-primary);
}

/* Main Layout */
.main-layout {
    display: flex;
    gap: 2rem;
    min-height: calc(100vh - 200px);
}

/* Sidebar */
.sidebar {
    width: 300px;
    background: var(--bg-secondary);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: sticky;
    top: 2rem;
    height: fit-content;
}

.sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.history-list {
    max-height: 400px;
    overflow-y: auto;
    margin-bottom: 1rem;
}

.history-item {
    background: var(--bg-primary);
    padding: 1rem;
    margin-bottom: 0.75rem;
    border-radius: var(--radius);
    border-left: 4px solid var(--accent-primary);
    cursor: pointer;
    transition: var(--transition);
}

.history-item:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow);
}

.history-item h4 {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.history-item p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.history-date {
    font-size: 0.8rem;
    color: var(--text-secondary);
    opacity: 0.7;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Info Panel */
.info-panel {
    background: linear-gradient(135deg, var(--bg-tertiary), var(--bg-secondary));
    padding: 1.5rem;
    border-radius: var(--radius);
    border-left: 5px solid var(--accent-primary);
    margin-bottom: 1rem;
}

.info-panel h3 {
    margin-bottom: 1rem;
    color: var(--accent-primary);
}

.info-panel ul {
    padding-left: 1.5rem;
    margin-bottom: 1rem;
}

.info-panel li {
    margin-bottom: 0.5rem;
}

/* Controls Grid */
.controls-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 1rem;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.control-group label {
    font-weight: 600;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.form-select {
    padding: 0.75rem;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition);
}

.form-select:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
}

/* Input Section */
.input-section {
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: var(--radius);
}

.input-section textarea {
    width: 100%;
    padding: 1rem;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 1rem;
    resize: vertical;
    min-height: 120px;
    margin: 1rem 0;
    transition: var(--transition);
}

.input-section textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
}

.input-actions {
    display: flex;
    gap: 1rem;
}

/* Action Buttons */
.action-buttons {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.btn-group {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

/* Result Section */
.result-section {
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border);
}

.result-stats {
    display: flex;
    gap: 1.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Loading */
.loading {
    text-align: center;
    padding: 3rem;
    display: none;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid var(--border);
    border-top: 5px solid var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-details {
    margin-top: 1rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Error */
.error {
    background: rgba(231, 76, 60, 0.1);
    color: var(--danger);
    padding: 1rem;
    border-radius: var(--radius);
    border-left: 4px solid var(--danger);
    margin-bottom: 1rem;
    display: none;
}

/* Result Text */
.result-text {
    min-height: 300px;
    padding: 1.5rem;
    background: var(--bg-primary);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-size: 1rem;
    line-height: 1.8;
    white-space: pre-wrap;
    overflow-wrap: break-word;
    outline: none;
    transition: var(--transition);
}

.result-text:empty:before {
    content: attr(placeholder);
    color: var(--text-secondary);
    opacity: 0.7;
}

.result-text:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
}

/* Export Buttons */
.export-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin: 1.5rem 0;
    padding-top: 1.5rem;
    border-top: 2px solid var(--border);
}

/* Result Actions */
.result-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 2px solid var(--border);
}

.quality-rating {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.stars {
    display: flex;
    gap: 0.25rem;
}

.star {
    font-size: 1.5rem;
    color: var(--border);
    cursor: pointer;
    transition: var(--transition);
}

.star:hover,
.star.active {
    color: var(--warning);
}

/* Footer */
.app-footer {
    text-align: center;
    padding: 2rem 0;
    color: var(--text-secondary);
    border-top: 2px solid var(--border);
    margin-top: 2rem;
}

.footer-info {
    margin-top: 1rem;
    font-size: 0.9rem;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1rem;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--accent-primary);
    color: white;
    padding: 1rem 1.5rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transform: translateY(100px);
    opacity: 0;
    transition: var(--transition);
    z-index: 1000;
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

/* Responsive */
@media (max-width: 768px) {
    .main-layout {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        position: static;
        margin-bottom: 1rem;
    }
    
    .controls-grid {
        grid-template-columns: 1fr;
    }
    
    .action-buttons {
        flex-direction: column;
        align-items: stretch;
    }
    
    .btn-group {
        justify-content: center;
    }
    
    .result-actions {
        flex-direction: column;
        gap: 1rem;
    }
    
    .header-content {
        flex-direction: column;
        text-align: center;
    }
}

/* Print Styles */
@media print {
    .sidebar,
    .action-buttons,
    .export-buttons,
    .result-actions,
    .app-footer {
        display: none;
    }
    
    .result-text {
        border: none;
        min-height: auto;
    }
}