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

body {
    font-family: 'Open Sans', sans-serif;
    background-color: #f5f5f5;
    color: #333;
    min-height: 100vh;
}

header {
    background: linear-gradient(135deg, #1565c0, #0d47a1);
    color: #fff;
    padding: 1.5rem 2rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

header h1 {
    font-size: 1.6rem;
    font-weight: 600;
}

.container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}

/* Input panel */
.input-panel {
    background: #fff;
    border-radius: 8px;
    padding: 1.5rem 2rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.1);
}

.input-panel .panel-title {
    font-weight: 600;
    font-size: 1rem;
    color: #333;
    margin-bottom: 1rem;
}

.input-tabs {
    display: flex;
    border-bottom: 2px solid #e0e0e0;
    margin-bottom: 1.25rem;
}

.input-tab {
    padding: 0.6rem 1.25rem;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    color: #888;
    border: none;
    background: none;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: color 0.2s, border-color 0.2s;
}

.input-tab:hover {
    color: #555;
}

.input-tab.active {
    color: #1565c0;
    border-bottom-color: #1565c0;
}

.tab-content {
    display: none;
}

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

/* Sample selector */
.sample-selector {
    display: flex;
    align-items: flex-end;
    gap: 1rem;
    flex-wrap: wrap;
}

.sample-selector .field {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.sample-selector .field label {
    font-weight: 600;
    font-size: 0.85rem;
    color: #555;
}

.sample-selector select,
.sample-selector input[type="text"] {
    font-family: 'Open Sans', sans-serif;
    font-size: 0.9rem;
    padding: 0.45rem 0.75rem;
    border: 1.5px solid #ccc;
    border-radius: 6px;
    outline: none;
    transition: border-color 0.2s;
    min-width: 160px;
}

.sample-selector select:focus,
.sample-selector input[type="text"]:focus {
    border-color: #1565c0;
}

.sample-selector .btn {
    font-family: 'Open Sans', sans-serif;
    font-size: 0.9rem;
    font-weight: 600;
    padding: 0.5rem 1.25rem;
    background: #1565c0;
    color: #fff;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: background 0.2s;
    white-space: nowrap;
}

.sample-selector .btn:hover {
    background: #0d47a1;
}

.sample-selector .btn:disabled {
    background: #b0bec5;
    cursor: not-allowed;
}

.sample-hint {
    margin-top: 0.6rem;
    font-size: 0.82rem;
    color: #999;
}

.sample-status {
    margin-top: 0.6rem;
    font-size: 0.88rem;
    border-radius: 4px;
    padding: 0;
}

.sample-status.error {
    color: #c62828;
    background: #ffebee;
    padding: 0.5rem 0.75rem;
}

.sample-status.success {
    color: #2e7d32;
    background: #e8f5e9;
    padding: 0.5rem 0.75rem;
}

.sample-status.loading {
    color: #1565c0;
    background: #e3f2fd;
    padding: 0.5rem 0.75rem;
}

.sample-status.loading::before {
    content: '';
    display: inline-block;
    width: 14px;
    height: 14px;
    border: 2px solid #90caf9;
    border-top-color: #1565c0;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-right: 0.5rem;
    vertical-align: middle;
}

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

/* File upload section */
.file-upload-row {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.file-upload-row label {
    font-weight: 600;
    font-size: 0.9rem;
    color: #555;
    white-space: nowrap;
}

.file-upload-row input[type="file"] {
    font-size: 0.9rem;
}

.file-upload-row .hint {
    font-size: 0.82rem;
    color: #999;
    width: 100%;
}

/* Legend */
.legend {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
    padding: 0.75rem 1rem;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.1);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.85rem;
    color: #555;
}

.legend-swatch {
    width: 16px;
    height: 16px;
    border-radius: 3px;
    display: inline-block;
    flex-shrink: 0;
}

/* Taxonomy card */
#taxonomy-card {
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

#taxonomy-card .card-content {
    padding: 1.25rem 1.5rem;
}

#taxonomy-card .card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: #333;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

#taxonomy-dag {
    overflow: auto;
    text-align: center;
    margin-top: 1rem;
}

#taxonomy-card .card-content.collapsed #taxonomy-dag {
    display: none;
}

#taxonomy-card .collapse-toggle {
    cursor: pointer;
    font-size: 1.5rem;
    color: #9e9e9e;
    transition: transform 0.2s, color 0.2s, background-color 0.2s;
    user-select: none;
    border-radius: 50%;
    width: 36px;
    height: 36px;
    line-height: 36px;
    text-align: center;
    flex-shrink: 0;
    border: none;
    background: none;
}

#taxonomy-card .collapse-toggle:hover {
    color: #616161;
    background-color: rgba(0, 0, 0, 0.08);
}

#taxonomy-card .collapse-toggle.collapsed {
    transform: rotate(-90deg);
}

#taxonomy-dag svg {
    font-family: 'Open Sans', sans-serif;
}

#taxonomy-dag .dag-node text {
    font-size: 12px;
    cursor: pointer;
}

#taxonomy-dag .dag-node a:hover rect {
    stroke-width: 2.5;
    filter: brightness(0.95);
}

#taxonomy-dag .dag-edge path {
    fill: none;
    stroke: #9e9e9e;
    stroke-width: 1.2;
    opacity: 0.5;
}

/* Empty state */
#empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: #999;
}

#empty-state .icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

#empty-state p {
    font-size: 1rem;
}