/* AIR Auditor - Main Stylesheet */

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --error-color: #ef4444;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --border-color: #e2e8f0;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--text-primary);
    background: var(--bg-secondary);
    line-height: 1.6;
}

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

/* Header */
header {
    text-align: center;
    padding: 40px 0;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-primary);
    margin-bottom: 40px;
}

.logo h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 5px;
    letter-spacing: 2px;
}

.tagline {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Sections */
.section {
    display: none;
    animation: fadeIn 0.4s ease-in;
}

.section.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.content-box {
    background: var(--bg-primary);
    border-radius: 12px;
    padding: 40px;
    box-shadow: var(--shadow-lg);
    margin-bottom: 30px;
}

.content-box h2 {
    font-size: 2rem;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.description {
    color: var(--text-secondary);
    font-size: 1.05rem;
    margin-bottom: 30px;
}

/* Upload Zone */
.upload-zone {
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    padding: 60px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: var(--bg-secondary);
}

.upload-zone:hover {
    border-color: var(--primary-color);
    background: #f1f5f9;
}

.upload-zone.drag-over {
    border-color: var(--primary-color);
    background: #eff6ff;
}

.upload-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.upload-text {
    font-size: 1.2rem;
    color: var(--text-primary);
    margin-bottom: 5px;
}

.upload-subtext {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 20px;
}

/* File Info */
.file-info {
    background: var(--bg-secondary);
    border-radius: 8px;
    padding: 30px;
    margin-top: 20px;
}

.file-details {
    margin-bottom: 25px;
}

.file-details p {
    margin-bottom: 10px;
    font-size: 1rem;
}

.file-details strong {
    color: var(--text-primary);
    min-width: 120px;
    display: inline-block;
}

/* Buttons */
.btn {
    padding: 12px 30px;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: #e2e8f0;
}

.btn-large {
    padding: 16px 40px;
    font-size: 1.1rem;
}

/* Progress */
.progress-container {
    margin: 30px 0;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--bg-secondary);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 10px;
}

.progress-fill {
    height: 100%;
    background: var(--primary-color);
    transition: width 0.3s ease;
    width: 0%;
}

.progress-text {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Error Message */
.error-message {
    background: #fee2e2;
    border: 1px solid #fecaca;
    border-radius: 8px;
    padding: 20px;
    margin-top: 20px;
    text-align: center;
}

.error-message p {
    color: var(--error-color);
    margin-bottom: 15px;
}

/* Info Box */
.info-box {
    background: var(--bg-primary);
    border-radius: 12px;
    padding: 30px;
    box-shadow: var(--shadow);
}

.info-box h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.info-box ul {
    list-style: none;
    margin-bottom: 25px;
}

.info-box li {
    padding: 10px 0;
    padding-left: 25px;
    position: relative;
}

.info-box li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: bold;
}

/* Payment Section */
.payment-details {
    text-align: center;
    padding: 40px 0;
}

.price-box {
    margin-bottom: 30px;
}

.price {
    font-size: 3.5rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.price-description {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.payment-note {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 15px;
}

/* Processing Steps */
.processing-steps {
    margin: 40px 0;
}

.step {
    display: flex;
    align-items: center;
    padding: 20px;
    margin-bottom: 15px;
    border-radius: 8px;
    background: var(--bg-secondary);
    transition: all 0.3s ease;
}

.step.active {
    background: #eff6ff;
    border-left: 4px solid var(--primary-color);
}

.step.completed {
    background: #f0fdf4;
    border-left: 4px solid var(--success-color);
}

.step-icon {
    font-size: 2rem;
    margin-right: 20px;
    min-width: 40px;
    text-align: center;
}

.step.completed .step-icon {
    color: var(--success-color);
}

.step.active .step-icon {
    color: var(--primary-color);
}

.spinner {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.step-content h4 {
    margin-bottom: 5px;
    color: var(--text-primary);
}

.step-content p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Success Icon */
.success-icon {
    font-size: 5rem;
    color: var(--success-color);
    text-align: center;
    margin-bottom: 20px;
}

/* Download Buttons */
.download-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin: 40px 0;
}

.download-btn {
    display: flex;
    align-items: center;
    padding: 25px;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.3s ease;
}

.download-btn:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.download-icon {
    font-size: 3rem;
    margin-right: 20px;
}

.download-info h4 {
    margin-bottom: 5px;
    color: var(--text-primary);
}

.download-info p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Report Info */
.report-info {
    background: var(--bg-secondary);
    border-radius: 8px;
    padding: 20px;
    margin: 30px 0;
}

.report-info p {
    margin-bottom: 8px;
}

.info-note {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-style: italic;
}

/* Footer */
footer {
    text-align: center;
    padding: 40px 20px;
    margin-top: 60px;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer-links {
    margin-top: 10px;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    margin: 0 10px;
}

.footer-links a:hover {
    color: var(--primary-color);
}

/* Responsive */
@media (max-width: 768px) {
    .logo h1 {
        font-size: 2rem;
    }
    
    .content-box {
        padding: 25px;
    }
    
    .download-buttons {
        grid-template-columns: 1fr;
    }
    
    .price {
        font-size: 2.5rem;
    }
}