/* ============================================
   Violin Plot Analyzer - Light Theme CSS
   Centered container layout like interpolationcalculator.com
   ============================================ */

#vpa-wrap {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: #444;
    max-width: 700px;
    margin: 0 auto;
    padding: 0 16px;
}

#vpa-wrap * {
    box-sizing: border-box;
}

/* ---- CARDS ---- */
.vpa-card {
    background: #fff;
    border: 1px solid #e8eaed;
    border-radius: 12px;
    padding: 30px;
    margin-bottom: 20px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.vpa-step-title {
    font-size: 20px;
    font-weight: 600;
    color: #2c3e50;
    margin: 0 0 22px 0;
}

/* ---- RADIO CARDS ---- */
.vpa-radio-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}

@media (max-width: 560px) {
    .vpa-radio-group { grid-template-columns: 1fr; }
}

.vpa-radio-card {
    display: block;
    cursor: pointer;
    border: 2px solid #e8eaed;
    border-radius: 10px;
    padding: 18px 20px;
    transition: border-color 0.15s, background 0.15s;
    background: #f8f9fa;
}

.vpa-radio-card:hover {
    border-color: #3498db;
    background: #fff;
}

.vpa-radio-card.vpa-active {
    border-color: #3498db;
    background: #eaf4fb;
}

.vpa-radio-card input[type="radio"] {
    display: none;
}

.vpa-radio-inner {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.vpa-radio-title {
    font-size: 15px;
    font-weight: 600;
    color: #2c3e50;
}

.vpa-radio-desc {
    font-size: 13px;
    color: #777;
    line-height: 1.4;
}

/* ---- INPUTS ---- */
.vpa-btn.vpa-btn-secondary {
    margin-bottom: 18px;
}

.vpa-input-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

@media (max-width: 600px) {
    .vpa-input-row { grid-template-columns: 1fr; }
}

.vpa-field {
    display: flex;
    flex-direction: column;
    gap: 7px;
}

.vpa-label {
    font-size: 14px;
    font-weight: 500;
    color: #34495e;
}

.vpa-hint {
    font-weight: 400;
    color: #999;
}

.vpa-textarea {
    border: 1px solid #dde1e7;
    border-radius: 8px;
    padding: 12px 14px;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 14px;
    color: #444;
    resize: vertical;
    transition: border-color 0.15s, box-shadow 0.15s;
    width: 100%;
    background: #fff;
    line-height: 1.6;
}

.vpa-textarea:focus {
    outline: none;
    border-color: #3498db;
    box-shadow: 0 0 0 3px rgba(52,152,219,0.12);
}

.vpa-textarea::placeholder {
    color: #bbb;
}

/* ---- INFO BOX ---- */
.vpa-info-box {
    margin-top: 14px;
    padding: 12px 16px;
    background: #eaf4fb;
    border-radius: 8px;
    font-size: 14px;
    color: #555;
    border-left: 3px solid #3498db;
}

/* ---- STYLE GRID ---- */
.vpa-style-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
}

@media (max-width: 640px) {
    .vpa-style-grid { grid-template-columns: repeat(2, 1fr); }
}

.vpa-style-card {
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    cursor: pointer;
    border: 2px solid #e8eaed;
    border-radius: 10px;
    padding: 16px 10px;
    transition: border-color 0.15s, background 0.15s;
    background: #f8f9fa;
}

.vpa-style-card:hover {
    border-color: #3498db;
    background: #fff;
}

.vpa-style-card.vpa-active,
.vpa-style-card:has(input:checked) {
    border-color: #3498db;
    background: #eaf4fb;
}

.vpa-style-card input[type="radio"] {
    display: none;
}

.vpa-style-name {
    font-size: 13px;
    font-weight: 500;
    color: #2c3e50;
    line-height: 1.3;
}

/* ---- BUTTONS ---- */
.vpa-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.15s;
    border: none;
    padding: 11px 22px;
    text-decoration: none;
}

.vpa-btn-primary {
    background: #3498db;
    color: #fff;
    font-size: 16px;
    padding: 14px 32px;
}

.vpa-btn-primary:hover {
    background: #2980b9;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(52,152,219,0.3);
}

.vpa-btn-secondary {
    background: #f8f9fa;
    color: #555;
    border: 1px solid #dde1e7;
}

.vpa-btn-secondary:hover {
    background: #e9ecef;
    border-color: #adb5bd;
    color: #333;
}

.vpa-btn-sm {
    padding: 8px 14px;
    font-size: 13px;
}

/* ---- ERROR ---- */
.vpa-error {
    margin-top: 14px;
    padding: 12px 16px;
    background: #fdf3f3;
    border: 1px solid #f5c6cb;
    border-radius: 8px;
    color: #c0392b;
    font-size: 14px;
    border-left: 3px solid #e74c3c;
}

/* ---- RESULTS ---- */
#vpa-results {
    margin-top: 24px;
    animation: vpa-fadein 0.35s ease;
}

@keyframes vpa-fadein {
    from { opacity: 0; transform: translateY(12px); }
    to   { opacity: 1; transform: translateY(0); }
}

.vpa-results-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    align-items: start;
}

.vpa-plot-panel,
.vpa-stats-panel {
    background: #fff;
    border: 1px solid #e8eaed;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.vpa-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid #e8eaed;
    background: #f8f9fa;
}

.vpa-panel-header h3 {
    font-size: 16px;
    font-weight: 600;
    color: #2c3e50;
    margin: 0;
}

#vpa-plot-container {
    padding: 20px;
    background: #ffffff;
    border-radius: 0 0 12px 12px;
}

#vpa-svg {
    width: 100%;
    display: block;
}

/* ---- STATS ---- */
#vpa-stats-grid {
    padding: 8px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4px;
}

.vpa-stat-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 11px 14px;
    border-radius: 6px;
    font-size: 14px;
}

.vpa-stat-row:nth-child(even) {
    background: #f8f9fa;
}

.vpa-stat-label {
    color: #666;
    font-weight: 500;
}

.vpa-stat-value {
    color: #2c3e50;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}