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

body {
    font-family: -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: 800px;
    margin: 0 auto;
    padding: 20px;
}

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

.header h1 {
    font-size: 3rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

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

.card {
    background: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    margin-bottom: 20px;
}

.upload-area {
    border: 3px dashed #ddd;
    border-radius: 15px;
    padding: 60px 20px;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    margin-bottom: 30px;
}

.upload-area:hover {
    border-color: #667eea;
    background: #f8f9ff;
}

.upload-area.dragover {
    border-color: #667eea;
    background: #f0f2ff;
}

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

.upload-text {
    font-size: 1.2rem;
    color: #666;
    margin-bottom: 20px;
}

.file-input {
    display: none;
}

.btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 15px 30px;
    border-radius: 10px;
    font-size: 1.1rem;
    cursor: pointer;
    transition: transform 0.2s ease;
    width: 100%;
    margin-bottom: 20px;
}

.btn:hover {
    transform: translateY(-2px);
}

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

.auth-section {
    display: none;
    margin-bottom: 30px;
}

.auth-section.active {
    display: block;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
    color: #555;
}

.form-group input {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus {
    outline: none;
    border-color: #667eea;
}

.form-group small {
    color: #666;
    font-size: 0.8rem;
    margin-top: 5px;
    display: block;
}

.status {
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    display: none;
}

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

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

.nav-tabs {
    display: flex;
    margin-bottom: 30px;
    border-bottom: 2px solid #eee;
}

.nav-tab {
    flex: 1;
    padding: 15px;
    text-align: center;
    cursor: pointer;
    border-bottom: 3px solid transparent;
    transition: all 0.3s ease;
    font-weight: 600;
}

.nav-tab:hover {
    background: #f8f9ff;
}

.nav-tab.active {
    border-bottom-color: #667eea;
    color: #667eea;
}

.footer {
    text-align: center;
    color: white;
    opacity: 0.8;
    margin-top: 40px;
}

.tab-content {
    display: none;
}

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

/* Mobile responsive */
@media (max-width: 600px) {
    .header h1 {
        font-size: 2rem;
    }
    
    .card {
        padding: 20px;
    }
    
    .upload-area {
        padding: 40px 20px;
    }
    
    .nav-tabs {
        flex-direction: column;
    }
    
    .nav-tab {
        border-bottom: 1px solid #eee;
        border-right: none;
    }
    
    .nav-tab.active {
        border-bottom-color: #667eea;
        border-right-color: transparent;
    }
}

/* Loading animations */
.processing {
    opacity: 0.7;
    pointer-events: none;
}

.btn.loading::after {
    content: "...";
    animation: loading 1s infinite;
}

@keyframes loading {
    0%, 33% { content: "."; }
    34%, 66% { content: ".."; }
    67%, 100% { content: "..."; }
}

/* Success animations */
.success-flash {
    animation: successFlash 0.5s ease-in-out;
}

@keyframes successFlash {
    0% { background-color: #d4edda; }
    50% { background-color: #c3e6cb; }
    100% { background-color: #d4edda; }
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0);
    backdrop-filter: blur(0px);
    transition: background-color 0.3s ease, backdrop-filter 0.3s ease;
    /* Center content from the start */
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.modal.show {
    display: flex;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(5px);
}

.modal-content {
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow: hidden;
    position: relative;
    animation: modalSlideIn 0.3s ease-out;
    /* Ensure content starts centered */
    margin: auto;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.modal-header {
    padding: 2rem 2rem 1rem 2rem;
    border-bottom: 1px solid #e9ecef;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    margin: 0;
    color: #333;
    font-size: 1.5rem;
}

.modal-close {
    background: none;
    border: none;
    font-size: 2rem;
    color: #999;
    cursor: pointer;
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.2s ease;
}

.modal-close:hover {
    background: #f0f0f0;
    color: #333;
}

.modal-body {
    padding: 1rem 2rem 2rem 2rem;
    overflow-y: auto;
    max-height: calc(90vh - 120px);
}

/* Prevent body scroll when modal is open */
body.modal-open {
    overflow: hidden;
    position: fixed;
    width: 100%;
    height: 100%;
}

/* Toggle Switch Styles */
.toggle-switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 26px;
}

.toggle-switch input[type="checkbox"] {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: 0.3s;
    border-radius: 26px;
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: 0.3s;
    border-radius: 50%;
}

.toggle-switch input:checked + .toggle-slider {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.toggle-switch input:checked + .toggle-slider:before {
    transform: translateX(24px);
}

.toggle-switch input:focus + .toggle-slider {
    box-shadow: 0 0 1px #667eea;
}

/* Dark mode toggle switch */
[data-theme="dark"] .toggle-slider {
    background-color: #555;
}

[data-theme="dark"] .toggle-switch input:checked + .toggle-slider {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

/* Button variants */
.btn-outline {
    background: transparent;
    color: #667eea;
    border: 2px solid #667eea;
}

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

.btn-secondary {
    background: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background: #5a6268;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-large {
    padding: 18px 36px;
    font-size: 1.2rem;
}

.btn-full {
    width: 100%;
}

/* Dark mode styles are loaded separately via HTML link tag */