/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 2rem;
    color: white;
}

header h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

header p {
    font-size: 1.2rem;
    opacity: 0.9;
}

/* Main card */
.card {
    background: white;
    border-radius: 16px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    overflow: hidden;
    margin-bottom: 2rem;
}

/* Input section */
.input-section {
    padding: 2rem;
    border-bottom: 1px solid #eee;
}

.model-selector {
    margin-bottom: 1.5rem;
}

.model-selector label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: #555;
}

.model-selector select {
    width: 100%;
    max-width: 300px;
    padding: 12px 16px;
    border: 2px solid #e1e5e9;
    border-radius: 8px;
    font-size: 1rem;
    background: white;
    transition: border-color 0.3s;
}

.model-selector select:focus {
    outline: none;
    border-color: #667eea;
}

/* Tabs */
.method-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 1rem;
}

.tab-btn {
    padding: 10px 20px;
    border: none;
    background: #f8f9fa;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s;
}

.tab-btn.active {
    background: #667eea;
    color: white;
}

.tab-btn:hover:not(.active) {
    background: #e9ecef;
}

/* Tab content */
.tab-content {
    display: none;
    margin-bottom: 1.5rem;
}

.tab-content.active {
    display: block;
}

/* Text input */
#text-input {
    width: 100%;
    padding: 16px;
    border: 2px solid #e1e5e9;
    border-radius: 8px;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 14px;
    resize: vertical;
    min-height: 200px;
    transition: border-color 0.3s;
}

#text-input:focus {
    outline: none;
    border-color: #667eea;
}

/* File upload */
.file-upload-area {
    border: 2px dashed #d1d5db;
    border-radius: 8px;
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    background: #fafafa;
}

.file-upload-area:hover {
    border-color: #667eea;
    background: #f8faff;
}

.file-upload-area.dragover {
    border-color: #667eea;
    background: #f0f4ff;
}

.upload-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.file-upload-area p {
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: #555;
}

.file-upload-area small {
    color: #888;
}

/* Action buttons */
.action-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn-primary, .btn-secondary {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 1rem;
}

.btn-primary {
    background: #667eea;
    color: white;
}

.btn-primary:hover {
    background: #5a6fd8;
    transform: translateY(-2px);
}

.btn-secondary {
    background: #f8f9fa;
    color: #666;
    border: 2px solid #e9ecef;
}

.btn-secondary:hover {
    background: #e9ecef;
}

/* Results section */
.results-section {
    padding: 2rem;
    background: #f8f9fa;
}

.result-card h3 {
    color: #333;
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.stat-item {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.stat-label {
    display: block;
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.stat-value {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: #667eea;
}

/* Cost estimate */
.cost-estimate {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid #28a745;
}

.cost-estimate h4 {
    color: #28a745;
    margin-bottom: 1rem;
}

.cost-estimate p {
    margin-bottom: 0.5rem;
    font-weight: 500;
}

/* Info section */
.info-section {
    background: white;
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
}

.info-section h3 {
    text-align: center;
    margin-bottom: 2rem;
    color: #333;
    font-size: 1.8rem;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.info-card {
    padding: 1.5rem;
    border: 1px solid #e9ecef;
    border-radius: 8px;
    background: #fafafa;
}

.info-card h4 {
    color: #667eea;
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.info-card p {
    color: #666;
    line-height: 1.6;
}

/* Footer */
footer {
    text-align: center;
    color: white;
    opacity: 0.8;
    padding: 2rem 0;
}

footer a {
    color: white;
    text-decoration: none;
    font-weight: 500;
}

footer a:hover {
    text-decoration: underline;
}

/* Visitor counter */
.visitor-counter {
    margin-top: 1rem;
    padding: 0.8rem 1.2rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    display: inline-block;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.visitor-counter span {
    font-size: 0.9rem;
    font-weight: 500;
}

#count-number {
    color: #FFD700;
    font-weight: 700;
    margin-left: 4px;
}

/* Loading overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.8);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    color: white;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(255,255,255,0.3);
    border-top: 4px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 1rem;
}

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

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    header h1 {
        font-size: 2.5rem;
    }
    
    .input-section,
    .results-section {
        padding: 1.5rem;
    }
    
    .stats-grid {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
        gap: 0.8rem;
    }
    
    .stat-value {
        font-size: 1.5rem;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .btn-primary,
    .btn-secondary {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .method-tabs {
        flex-direction: column;
    }
    
    .tab-btn {
        width: 100%;
    }
}

/* Animations */
.result-card {
    animation: fadeInUp 0.5s ease-out;
}

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

/* Focus states for accessibility */
.btn-primary:focus,
.btn-secondary:focus,
.tab-btn:focus,
select:focus,
textarea:focus {
    outline: 2px solid #667eea;
    outline-offset: 2px;
}

/* Error states */
.error {
    border-color: #dc3545 !important;
}

.error-message {
    color: #dc3545;
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

.approx-badge {
    display: inline-block;
    font-size: 0.7rem;
    color: #f59e0b;
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.3);
    border-radius: 4px;
    padding: 2px 6px;
    margin-top: 4px;
    font-weight: 500;
}