/* 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;
    padding: 20px 0;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header Styles */
.header {
    text-align: center;
    margin-bottom: 40px;
    color: white;
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.header p {
    font-size: 1.1rem;
    opacity: 0.9;
    font-weight: 300;
}

/* Form Styles */
.upload-form {
    background: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    backdrop-filter: blur(10px);
}

.form-section {
    margin-bottom: 40px;
}

.form-section h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: #2d3748;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid #e2e8f0;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-weight: 500;
    color: #4a5568;
    margin-bottom: 8px;
    font-size: 0.9rem;
}

.form-group input {
    padding: 12px 16px;
    border: 2px solid #e2e8f0;
    border-radius: 10px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: #f7fafc;
}

.form-group input:focus {
    outline: none;
    border-color: #667eea;
    background: white;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-group input:invalid {
    border-color: #e53e3e;
}

/* Upload Section Styles */
.upload-section {
    margin-bottom: 30px;
    padding: 25px;
    background: #f8fafc;
    border-radius: 15px;
    border: 2px solid #e2e8f0;
    transition: all 0.3s ease;
}

.upload-section:hover {
    border-color: #cbd5e0;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

.upload-section h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: #2d3748;
    margin-bottom: 8px;
}

.section-description {
    color: #718096;
    font-size: 0.9rem;
    margin-bottom: 20px;
}

/* File Upload Area */
.file-upload-area {
    position: relative;
    border: 2px dashed #cbd5e0;
    border-radius: 12px;
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: white;
}

.file-upload-area:hover {
    border-color: #667eea;
    background: #f7fafc;
}

.file-upload-area.dragover {
    border-color: #667eea;
    background: #edf2f7;
    transform: scale(1.02);
}

.file-input {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
    z-index: 10;
}

.upload-placeholder {
    pointer-events: none;
}

.upload-placeholder svg {
    color: #a0aec0;
    margin-bottom: 15px;
}

.upload-placeholder p {
    font-weight: 500;
    color: #4a5568;
    margin-bottom: 8px;
    font-size: 1rem;
}

.upload-placeholder span {
    color: #a0aec0;
    font-size: 0.85rem;
}

/* File List */
.file-list {
    margin-top: 15px;
}

.file-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    background: white;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    margin-bottom: 8px;
    transition: all 0.3s ease;
}

.file-item:hover {
    border-color: #cbd5e0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.file-info {
    display: flex;
    align-items: center;
    flex: 1;
}

.file-icon {
    width: 24px;
    height: 24px;
    margin-right: 12px;
    color: #667eea;
}

.file-details {
    flex: 1;
}

.file-name {
    font-weight: 500;
    color: #2d3748;
    font-size: 0.9rem;
    margin-bottom: 2px;
}

.file-size {
    color: #a0aec0;
    font-size: 0.8rem;
}

.remove-file {
    background: #fed7d7;
    color: #c53030;
    border: none;
    border-radius: 6px;
    padding: 6px 12px;
    cursor: pointer;
    font-size: 0.8rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.remove-file:hover {
    background: #feb2b2;
}

/* Submit Button */
.submit-btn {
    width: 100%;
    padding: 16px 32px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.submit-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
}

.submit-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

.btn-loading {
    display: flex;
    align-items: center;
    gap: 10px;
}

.spinner {
    width: 20px;
    height: 20px;
    animation: spin 1s linear infinite;
}

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

/* Message Container */
.message-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    max-width: 400px;
}

.message-content {
    padding: 16px 20px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    animation: slideIn 0.3s ease-out;
}

.message-content.success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.message-content.error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.message-content.info {
    background: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

.close-message {
    background: none;
    border: none;
    font-size: 18px;
    cursor: pointer;
    color: inherit;
    opacity: 0.7;
    transition: opacity 0.2s;
}

.close-message:hover {
    opacity: 1;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Copyright Section */
.copyright-section {
    margin-top: 60px;
    text-align: center;
}

.copyright-divider {
    width: 90%;
    border: none;
    height: 1px;
    background-color: #e0e0e0;
    margin: 0 0 20px 0;
    justify-self: center;
}

.copyright-text {
    color: #fff;
    font-size: 14px;
    font-weight: 400;
    margin: 0;
    padding: 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    
    .header h1 {
        font-size: 2rem;
    }
    
    .upload-form {
        padding: 25px;
    }
    
    .form-grid {
        grid-template-columns: 1fr;
    }
    
    .upload-section {
        padding: 20px;
    }
    
    .file-upload-area {
        padding: 30px 15px;
    }
    
    .file-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    .file-info {
        width: 100%;
    }
    
    .remove-file {
        align-self: flex-end;
    }
    
    .message-container {
        left: 20px;
        right: 20px;
        max-width: none;
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 1.8rem;
    }
    
    .upload-form {
        padding: 20px;
    }
    
    .form-section {
        margin-bottom: 30px;
    }
    
    .upload-section {
        padding: 15px;
    }
    
    .file-upload-area {
        padding: 25px 10px;
    }
    
    .submit-btn {
        padding: 14px 24px;
        font-size: 1rem;
    }
}

/* Loading States */
.loading {
    opacity: 0.7;
    pointer-events: none;
}

/* File Type Icons */
.file-icon.pdf {
    color: #e53e3e;
}

.file-icon.image {
    color: #38a169;
}

.file-icon.document {
    color: #3182ce;
}