:root {
    --primary-color: #4CAF50;
    --secondary-color: #f44336;
    --accent-color: #2196F3;
    --background-color: #f5f5f5;
    --card-bg: #ffffff;
    --text-color: #333333;
    --text-light: #666666;
    --border-color: #dddddd;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

.dark-theme {
    --primary-color: #66BB6A;
    --secondary-color: #EF5350;
    --accent-color: #42A5F5;
    --background-color: #121212;
    --card-bg: #1e1e1e;
    --text-color: #e0e0e0;
    --text-light: #aaaaaa;
    --border-color: #333333;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: var(--transition);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 20px;
    background: var(--background-color);
    color: var(--text-color);
}

.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 100;
}

.theme-btn {
    background: var(--card-bg);
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    cursor: pointer;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: var(--text-color);
}

.tool-container {
    max-width: 900px;
    margin: 0 auto;
    background: var(--card-bg);
    border-radius: 12px;
    box-shadow: var(--shadow);
    padding: 30px;
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.header {
    text-align: center;
    margin-bottom: 30px;
}

.header h1 {
    color: var(--text-color);
    margin-bottom: 10px;
    font-size: 2.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.header h1 i {
    color: var(--accent-color);
}

.subtitle {
    color: var(--text-light);
    font-size: 1.1rem;
}

.dashboard {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.dashboard-card {
    background: var(--card-bg);
    border-radius: 10px;
    padding: 20px;
    text-align: center;
    box-shadow: var(--shadow);
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.dashboard-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.dashboard-card:nth-child(1):hover {
    border-color: var(--primary-color);
}

.dashboard-card:nth-child(2):hover {
    border-color: var(--accent-color);
}

.dashboard-card:nth-child(3):hover {
    border-color: #FF9800;
}

.dashboard-card:nth-child(4):hover {
    border-color: #9C27B0;
}

.card-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--accent-color), #1976D2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 15px;
    color: white;
    font-size: 1.5rem;
}

.dashboard-card:nth-child(1) .card-icon {
    background: linear-gradient(135deg, var(--primary-color), #388E3C);
}

.dashboard-card:nth-child(2) .card-icon {
    background: linear-gradient(135deg, var(--accent-color), #1976D2);
}

.dashboard-card:nth-child(3) .card-icon {
    background: linear-gradient(135deg, #FF9800, #F57C00);
}

.dashboard-card:nth-child(4) .card-icon {
    background: linear-gradient(135deg, #9C27B0, #7B1FA2);
}

.dashboard-card h3 {
    margin-bottom: 10px;
    color: var(--text-color);
}

.dashboard-card p {
    color: var(--text-light);
    font-size: 0.9rem;
}

.tool-section {
    margin-bottom: 25px;
    animation: slideUp 0.5s ease;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

.section-title {
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.2rem;
}

.section-title i {
    color: var(--accent-color);
}

.upload-area {
    width: 100%;
    height: 200px;
    border: 2px dashed var(--border-color);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    cursor: pointer;
    margin-bottom: 15px;
    transition: var(--transition);
    background: var(--card-bg);
    position: relative;
    overflow: hidden;
}

.upload-area::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: var(--transition);
}

.upload-area:hover::before {
    left: 100%;
}

.upload-area:hover {
    border-color: var(--primary-color);
    transform: scale(1.01);
}

.upload-content i {
    font-size: 48px;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.upload-content p {
    margin: 0;
    color: var(--text-color);
    font-weight: 500;
}

.file-types {
    font-size: 0.8rem;
    color: var(--text-light);
    margin-top: 5px;
}

#image-preview {
    max-width: 100%;
    max-height: 300px;
    display: block;
    margin: 15px auto;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.ai-assistant {
    margin-bottom: 15px;
}

.ai-btn {
    padding: 10px 15px;
    background: linear-gradient(135deg, #FF9800, #F57C00);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
}

.ai-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(255, 152, 0, 0.3);
}

.ai-loading {
    padding: 10px;
    background: rgba(255, 152, 0, 0.1);
    border-radius: 6px;
    text-align: center;
    color: #FF9800;
    margin-top: 10px;
}

.caption-editor {
    min-height: 150px;
    padding: 15px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--card-bg);
    outline: none;
    color: var(--text-color);
    line-height: 1.6;
    transition: var(--transition);
}

.caption-editor:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px rgba(33, 150, 243, 0.2);
}

.formatting-tools {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 10px;
}

.format-btn {
    padding: 10px 12px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    color: var(--text-color);
    transition: var(--transition);
}

.format-btn:hover {
    background: var(--accent-color);
    color: white;
    transform: translateY(-2px);
}

.color-picker {
    width: 40px;
    height: 40px;
    padding: 0;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
}

.font-selector, .caption-style-selector, .font-size-selector {
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--card-bg);
    color: var(--text-color);
}

.font-size-selector {
    width: 80px;
}

.caption-style-selector {
    width: 140px;
}

.action-btns {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.action-btn {
    padding: 12px 20px;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
    flex: 1;
    justify-content: center;
}

.action-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.action-btn.primary {
    background: linear-gradient(135deg, var(--primary-color), #388E3C);
}

.action-btn.primary:hover {
    background: linear-gradient(135deg, #388E3C, var(--primary-color));
}

.action-btn.secondary {
    background: linear-gradient(135deg, var(--secondary-color), #D32F2F);
}

.action-btn.secondary:hover {
    background: linear-gradient(135deg, #D32F2F, var(--secondary-color));
}

.action-btn.success {
    background: linear-gradient(135deg, #2196F3, #1976D2);
}

.action-btn.success:hover {
    background: linear-gradient(135deg, #1976D2, #2196F3);
}

.action-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.output-container {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    margin-top: 20px;
    background: var(--card-bg);
    animation: fadeIn 0.5s ease;
}

.output-title {
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.2rem;
}

.output-content {
    min-height: 50px;
    padding: 15px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    text-align: center;
}

.hidden {
    display: none;
}

/* Responsive Design */
@media (max-width: 768px) {
    .tool-container {
        padding: 20px;
    }
    
    .dashboard {
        grid-template-columns: 1fr 1fr;
    }
    
    .formatting-tools, .action-btns {
        flex-direction: column;
    }
    
    .format-btn, .action-btn {
        width: 100%;
    }
    
    .header h1 {
        font-size: 1.8rem;
    }
}

@media (max-width: 480px) {
    .dashboard {
        grid-template-columns: 1fr;
    }
    
    body {
        padding: 10px;
    }
    
    .theme-toggle {
        top: 10px;
        right: 10px;
    }
    
    .theme-btn {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }
}