/* Modern Black & White Design with Avenir */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-black: #000000;
    --secondary-gray: #333333;
    --light-gray: #666666;
    --border-gray: #e0e0e0;
    --bg-white: #ffffff;
    --bg-gray: #f8f8f8;
    --disabled-gray: #cccccc;
}

body {
    font-family: 'Avenir', 'Avenir Next', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--primary-black);
    background: var(--bg-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 60px;
    padding-bottom: 30px;
    border-bottom: 2px solid var(--primary-black);
}

header h1 {
    font-size: 2.5rem;
    font-weight: 600;
    letter-spacing: -0.5px;
    margin-bottom: 10px;
}

.logo {
    max-width: 200px;
    height: auto;
    margin: 20px 0;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

.subtitle {
    font-size: 1.1rem;
    color: var(--secondary-gray);
    font-weight: 400;
}

/* Loading Screen */
.loading-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 50vh;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 3px solid var(--border-gray);
    border-top: 3px solid var(--primary-black);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.loading-detail {
    color: var(--light-gray);
    font-size: 0.9rem;
    margin-top: 10px;
}

/* Cards */
.card {
    background: var(--bg-white);
    border: 1px solid var(--border-gray);
    padding: 30px;
    margin-bottom: 30px;
    transition: box-shadow 0.2s;
}

.card:hover {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.card h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 20px;
    letter-spacing: -0.3px;
}

.card h3 {
    font-size: 1.2rem;
    font-weight: 500;
    margin: 25px 0 15px;
}

/* Help Text */
.help-text {
    color: var(--light-gray);
    font-size: 0.95rem;
    margin-bottom: 20px;
    line-height: 1.5;
}

.help-text code {
    background: var(--bg-gray);
    padding: 2px 6px;
    font-family: 'SF Mono', 'Monaco', 'Courier New', monospace;
    font-size: 0.9em;
    border: 1px solid var(--border-gray);
}

/* Upload Area */
.upload-area {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

input[type="file"] {
    flex: 1;
    min-width: 200px;
    padding: 12px;
    border: 2px solid var(--border-gray);
    background: var(--bg-white);
    font-family: inherit;
    font-size: 0.95rem;
    cursor: pointer;
    transition: border-color 0.2s;
}

input[type="file"]:hover {
    border-color: var(--secondary-gray);
}

/* Buttons */
.btn {
    padding: 12px 24px;
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: 500;
    border: none;
    cursor: pointer;
    transition: all 0.2s;
    letter-spacing: 0.3px;
}

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

.btn-primary:hover:not(:disabled) {
    background: var(--secondary-gray);
}

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

.btn-secondary:hover:not(:disabled) {
    background: var(--bg-gray);
}

.btn:disabled {
    background: var(--bg-gray);
    color: var(--disabled-gray);
    border-color: var(--border-gray);
    cursor: not-allowed;
    opacity: 0.6;
}

.button-row {
    display: flex;
    gap: 15px;
    margin-top: 25px;
}

/* Form Groups */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--secondary-gray);
    font-size: 0.95rem;
}

.form-group input[type="checkbox"] {
    margin-right: 8px;
}

.form-group input[type="number"],
.form-group select {
    width: 100%;
    max-width: 300px;
    padding: 10px;
    border: 1px solid var(--border-gray);
    background: var(--bg-white);
    font-family: inherit;
    font-size: 0.95rem;
    transition: border-color 0.2s;
}

.form-group input[type="number"]:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-black);
}

/* Data Preview */
.data-preview {
    margin-top: 25px;
    padding-top: 25px;
    border-top: 1px solid var(--border-gray);
}

#data-summary {
    background: var(--bg-gray);
    padding: 15px;
    margin-bottom: 20px;
    font-size: 0.95rem;
    border-left: 3px solid var(--primary-black);
}

#data-table {
    overflow-x: auto;
    border: 1px solid var(--border-gray);
}

#data-table table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

#data-table th,
#data-table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--border-gray);
}

#data-table th {
    background: var(--bg-gray);
    font-weight: 600;
    color: var(--secondary-gray);
}

#data-table tr:hover {
    background: var(--bg-gray);
}

/* Status Area */
.status-area {
    background: var(--bg-gray);
    padding: 20px;
    border-left: 3px solid var(--primary-black);
    font-size: 0.95rem;
}

.console-output {
    background: var(--primary-black);
    color: #00ff00;
    padding: 15px;
    font-family: 'SF Mono', 'Monaco', 'Courier New', monospace;
    font-size: 0.85rem;
    max-height: 300px;
    overflow-y: auto;
    margin-top: 15px;
    display: none;
}

.console-output.active {
    display: block;
}

/* Tabs */
.tabs {
    display: flex;
    gap: 0;
    border-bottom: 2px solid var(--primary-black);
    margin-bottom: 25px;
}

.tab-btn {
    padding: 12px 24px;
    background: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    margin-bottom: -2px;
    color: var(--light-gray);
}

.tab-btn:hover {
    color: var(--primary-black);
}

.tab-btn.active {
    color: var(--primary-black);
    border-bottom-color: var(--primary-black);
}

.tab-pane {
    display: none;
    max-height: 75vh;
    overflow-y: auto;
    padding: 20px;
}

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

/* Results */
#results-area {
    margin-top: 20px;
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--light-gray);
}

#posterior-plots,
#curve-plot,
#roc-plot,
#comparison-plot {
    max-height: 65vh;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 10px;
}

.plot-container {
    border: 1px solid var(--border-gray);
    padding: 15px;
    background: var(--bg-white);
}

.plot-container canvas {
    width: 100%;
    height: auto;
}

#metrics-table {
    overflow-x: auto;
}

#metrics-table table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
}

#metrics-table th,
#metrics-table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--border-gray);
}

#metrics-table th {
    background: var(--bg-gray);
    font-weight: 600;
}

#metrics-table td {
    font-family: 'SF Mono', 'Monaco', 'Courier New', monospace;
    font-size: 0.9rem;
}

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

footer a {
    color: var(--primary-black);
    text-decoration: none;
    border-bottom: 1px solid var(--primary-black);
    transition: opacity 0.2s;
}

footer a:hover {
    opacity: 0.7;
}

/* Diagnostics Tables */
.diagnostics-table, .summary-table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    font-size: 0.95rem;
}

.diagnostics-table thead, .summary-table thead {
    background: var(--primary-black);
    color: var(--bg-white);
}

.diagnostics-table th, .summary-table th {
    padding: 12px;
    text-align: left;
    font-weight: 600;
}

.diagnostics-table td, .summary-table td {
    padding: 10px 12px;
    border-bottom: 1px solid var(--border-gray);
}

.diagnostics-table tr.good {
    background: rgba(76, 175, 80, 0.1);
}

.diagnostics-table tr.warning {
    background: rgba(255, 193, 7, 0.1);
}

/* Canvas Plots */
.trace-plot-container, .posterior-plot {
    margin: 10px 0;
}

canvas.trace-plot, canvas.posterior-histogram {
    display: block;
    margin: 5px auto;
    border: 1px solid var(--border-gray);
}

.histogram-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 15px;
    margin: 15px 0;
    max-height: 70vh;
    overflow-y: auto;
}

/* Responsive */
@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }
    
    .card {
        padding: 20px;
    }
    
    .upload-area {
        flex-direction: column;
    }
    
    input[type="file"] {
        min-width: 100%;
    }
    
    .button-row {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .histogram-container {
        grid-template-columns: 1fr;
    }
}