:root {
    /* Google Brand Palette */
    --google-blue: #1a73e8;
    --google-blue-hover: #1765cc;
    --google-blue-light: #e8f0fe;
    --google-blue-border: #aecbfa;

    --google-red: #ea4335;
    --google-red-hover: #d93025;
    --google-red-light: #fce8e6;
    --google-red-border: #f28b82;

    --google-yellow: #fbbc04;
    --google-yellow-dark: #b06000;
    --google-yellow-light: #fef7e0;
    --google-yellow-border: #fde293;

    --google-green: #34a853;
    --google-green-dark: #137333;
    --google-green-light: #e6f4ea;
    --google-green-border: #a8dab5;

    /* Google Workspace & Flat UI Surface Tokens */
    --bg-color: #f8f9fa;
    --surface-color: #ffffff;
    --surface-variant: #f1f3f4;
    --border-color: #dadce0;

    --text-primary: #202124;
    --text-secondary: #5f6368;
    --text-tertiary: #80868b;

    /* Flat minimal shadows */
    --shadow-sm: none;
    --shadow-md: 0 1px 2px rgba(60,64,67,0.08);
}

* {
    box-sizing: border-box;
    padding: 0;
    margin: 0;
    font-family: 'Google Sans', 'Google Sans Text', 'Roboto', system-ui, -apple-system, sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    padding: 0 0 2rem 0;
    line-height: 1.5;
}

/* Google 4-Color Accent Top Bar */
.google-color-bar {
    display: flex;
    height: 4px;
    width: 100%;
}

.google-color-bar div {
    flex: 1;
    height: 100%;
}

.bar-blue { background-color: var(--google-blue); }
.bar-red { background-color: var(--google-red); }
.bar-yellow { background-color: var(--google-yellow); }
.bar-green { background-color: var(--google-green); }

.app-container {
    max-width: 1240px;
    margin: 1.5rem auto 0 auto;
    padding: 0 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.85rem;
}

.brand-icon {
    width: 44px;
    height: 44px;
    border-radius: 4px;
    background: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-color);
}

.brand-title {
    font-family: 'Google Sans', sans-serif;
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.brand-subtitle {
    font-family: 'Google Sans Text', sans-serif;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

/* Model Selector Card */
.model-selector-card {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    padding: 0.65rem 1.1rem;
    border-radius: 4px;
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.model-selector-card label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    white-space: nowrap;
}

.model-select {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0.35rem 0.6rem;
    font-family: 'Google Sans Text', sans-serif;
    font-size: 0.85rem;
    color: var(--text-primary);
    outline: none;
    cursor: pointer;
    transition: border-color 0.2s ease;
}

.model-select:focus {
    border-color: var(--google-blue);
    box-shadow: 0 0 0 1px var(--google-blue);
}

/* Status Card */
.status-card {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    padding: 0.65rem 1.1rem;
    border-radius: 4px;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    min-width: 250px;
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 2px;
    display: inline-block;
}

.status-dot.loading {
    background-color: var(--google-yellow);
    animation: pulse 1.5s infinite;
}

.status-dot.ready {
    background-color: var(--google-green);
}

.status-dot.error {
    background-color: var(--google-red);
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.progress-container {
    height: 4px;
    background: var(--surface-variant);
    border-radius: 2px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: var(--google-blue);
    transition: width 0.3s ease;
}

/* Hero Card */
.hero-card {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 1.25rem 1.5rem;
}

.hero-card h2 {
    font-family: 'Google Sans', sans-serif;
    font-size: 0.9rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-secondary);
    margin-bottom: 0.85rem;
}

.concept-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.25rem;
}

.concept-step {
    display: flex;
    gap: 0.85rem;
    align-items: flex-start;
}

.step-num {
    width: 26px;
    height: 26px;
    border-radius: 4px;
    font-weight: 700;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.step-blue { background: var(--google-blue-light); color: var(--google-blue); }
.step-red { background: var(--google-red-light); color: var(--google-red); }
.step-green { background: var(--google-green-light); color: var(--google-green); }

.concept-step h3 {
    font-family: 'Google Sans', sans-serif;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.2rem;
}

.concept-step p {
    font-size: 0.82rem;
    color: var(--text-secondary);
}

.concept-step code {
    font-family: 'Roboto Mono', monospace;
    font-size: 0.78rem;
    background: var(--surface-variant);
    padding: 0.1rem 0.35rem;
    border-radius: 2px;
    color: var(--text-primary);
}

/* Main Grid */
.main-grid {
    display: grid;
    grid-template-columns: 1.7fr 1fr;
    gap: 1.5rem;
}

@media (max-width: 900px) {
    .main-grid {
        grid-template-columns: 1fr;
    }
}

.left-column, .right-column {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* Panel Cards */
.panel-card {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 1.5rem;
    transition: border-color 0.2s ease;
}

.panel-card:hover {
    border-color: #b0b5ba;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.2rem;
}

.panel-header h2 {
    font-family: 'Google Sans', sans-serif;
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* Forms & Inputs */
.add-form, .inference-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.form-group label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
}

input[type="text"], input[type="number"], textarea {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0.65rem 0.85rem;
    color: var(--text-primary);
    font-size: 0.9rem;
    outline: none;
    transition: border-color 0.2s ease;
}

input[type="text"]:focus, input[type="number"]:focus, textarea:focus {
    border-color: var(--google-blue);
    box-shadow: 0 0 0 1px var(--google-blue);
}

.label-input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.preset-badges {
    display: flex;
    gap: 0.5rem;
}

.preset-badge {
    border: 1px solid transparent;
    cursor: pointer;
    font-size: 0.78rem;
    font-weight: 500;
    padding: 0.25rem 0.65rem;
    border-radius: 4px;
    transition: background-color 0.15s ease;
}

.preset-badge:hover {
    filter: brightness(0.95);
}

/* Buttons */
.btn {
    padding: 0.6rem 1.25rem;
    border-radius: 4px;
    font-family: 'Google Sans', sans-serif;
    font-weight: 600;
    font-size: 0.88rem;
    cursor: pointer;
    border: 1px solid transparent;
    transition: background-color 0.2s ease, border-color 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn-primary {
    background-color: var(--google-blue);
    color: white;
}

.btn-primary:hover {
    background-color: var(--google-blue-hover);
}

.btn-secondary {
    background-color: var(--google-blue-light);
    color: var(--google-blue);
    border-color: var(--google-blue-border);
}

.btn-secondary:hover {
    background-color: #d2e3fc;
}

.btn-sm {
    padding: 0.35rem 0.85rem;
    font-size: 0.78rem;
    border-radius: 4px;
}

.btn-outline {
    background: transparent;
    border-color: var(--border-color);
    color: var(--text-secondary);
}

.btn-outline:hover {
    background-color: var(--surface-variant);
    color: var(--text-primary);
}

.btn-outline-danger {
    background: transparent;
    border-color: var(--google-red-border);
    color: var(--google-red);
}

.btn-outline-danger:hover {
    background-color: var(--google-red-light);
}

.form-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.form-group.inline {
    flex-direction: row;
    align-items: center;
    gap: 0.6rem;
}

.form-group.inline input {
    width: 65px;
    text-align: center;
}

/* Dataset List */
.dataset-section {
    margin-top: 1.5rem;
    padding-top: 1.2rem;
    border-top: 1px solid var(--border-color);
}

.dataset-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.dataset-actions h3 {
    font-family: 'Google Sans', sans-serif;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
}

.btn-group {
    display: flex;
    gap: 0.5rem;
}

.dataset-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 0.85rem;
    max-height: 280px;
    overflow-y: auto;
    padding-right: 0.3rem;
}

.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
    font-size: 0.85rem;
    background: var(--surface-variant);
    border-radius: 4px;
}

.example-card {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0.75rem 0.9rem;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    position: relative;
}

.example-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.example-text {
    font-size: 0.85rem;
    color: var(--text-primary);
}

.embedding-meta {
    font-size: 0.72rem;
    color: var(--text-tertiary);
}

.delete-btn {
    background: none;
    border: none;
    color: var(--text-tertiary);
    font-size: 1.2rem;
    line-height: 1;
    cursor: pointer;
    padding: 0 0.2rem;
}

.delete-btn:hover {
    color: var(--google-red);
}

/* Badges */
.badge {
    display: inline-block;
    padding: 0.25rem 0.65rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: lowercase;
}

.badge.lg {
    font-size: 0.95rem;
    padding: 0.4rem 1rem;
    border-radius: 4px;
}

.badge-positive, .label-positive {
    background-color: var(--google-green-light);
    color: var(--google-green-dark);
    border: 1px solid var(--google-green-border);
}

.badge-negative, .label-negative {
    background-color: var(--google-red-light);
    color: var(--google-red-hover);
    border: 1px solid var(--google-red-border);
}

.badge-neutral, .label-neutral {
    background-color: var(--google-yellow-light);
    color: var(--google-yellow-dark);
    border: 1px solid var(--google-yellow-border);
}

.label-custom {
    background-color: var(--google-blue-light);
    color: var(--google-blue-hover);
    border: 1px solid var(--google-blue-border);
}

/* Result Box */
.result-box {
    margin-top: 1.2rem;
    background: var(--surface-color);
    border: 1px solid var(--google-blue-border);
    border-radius: 4px;
    padding: 1.2rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.result-main {
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.result-title {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.confidence-box {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
    min-width: 180px;
}

.confidence-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.confidence-track {
    height: 8px;
    background: var(--surface-variant);
    border-radius: 2px;
    overflow: hidden;
}

.confidence-fill {
    height: 100%;
    background: var(--google-blue);
    border-radius: 2px;
    transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.vector-preview {
    font-family: 'Roboto Mono', monospace;
    font-size: 0.75rem;
    color: var(--text-secondary);
    background: var(--surface-variant);
    padding: 0.55rem 0.8rem;
    border-radius: 4px;
    overflow-x: auto;
    white-space: nowrap;
}

/* Neighbors Section */
.neighbors-section h4 {
    font-family: 'Google Sans', sans-serif;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.6rem;
}

.neighbors-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.neighbor-item {
    display: flex;
    gap: 0.75rem;
    align-items: center;
    background: var(--surface-variant);
    border: 1px solid var(--border-color);
    padding: 0.55rem 0.8rem;
    border-radius: 4px;
}

.neighbor-rank {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--google-blue);
    width: 24px;
}

.neighbor-content {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    flex-grow: 1;
}

.neighbor-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.distance-tag {
    font-size: 0.72rem;
    font-family: 'Roboto Mono', monospace;
    color: var(--text-secondary);
}

.neighbor-text {
    font-size: 0.82rem;
    color: var(--text-primary);
}

/* Console Log */
.log-panel {
    display: flex;
    flex-direction: column;
    height: 380px;
}

.live-tag {
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--google-green-dark);
    background: var(--google-green-light);
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    letter-spacing: 0.05em;
}

.log-output {
    flex-grow: 1;
    background: #202124;
    color: #e8eaed;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0.75rem;
    font-family: 'Roboto Mono', monospace;
    font-size: 0.78rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.log-entry {
    line-height: 1.4;
    word-break: break-word;
}

.log-time {
    color: #9aa0a6;
    margin-right: 0.3rem;
}

.log-info { color: #8ab4f8; }
.log-success { color: #81c995; }
.log-warn { color: #fde293; }
.log-error { color: #f28b82; }

/* Specs List */
.specs-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    font-size: 0.85rem;
}

.specs-list li {
    display: flex;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.4rem;
    color: var(--text-secondary);
}

.specs-list strong {
    color: var(--text-primary);
}

.specs-list code {
    font-family: 'Roboto Mono', monospace;
    color: var(--google-blue);
    background: var(--google-blue-light);
    padding: 0.1rem 0.3rem;
    border-radius: 2px;
}

/* Footer */
.app-footer {
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-tertiary);
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.app-footer a {
    color: var(--google-blue);
    text-decoration: none;
}

.app-footer a:hover {
    text-decoration: underline;
}

/* ==========================================================================
   Visual Storytelling & Interactive Deep Learning Visual Explorers
   ========================================================================== */

/* Hero Pipeline Header & Stepper Grid */
.hero-header-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.hero-subtitle {
    font-size: 0.88rem;
    color: var(--text-secondary);
    margin-top: 0.2rem;
}

.stepper-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
}

.stepper-step {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    background: var(--surface-variant);
    border: 1px solid var(--border-color);
    padding: 0.85rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.stepper-step:hover {
    border-color: var(--google-blue);
    background: #ffffff;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(26, 115, 232, 0.1);
}

.stepper-step.active {
    background: #ffffff;
    border-color: var(--google-blue);
    box-shadow: 0 0 0 2px var(--google-blue-light), 0 2px 8px rgba(0,0,0,0.06);
}

.step-details h3 {
    font-family: 'Google Sans', sans-serif;
    font-size: 0.92rem;
    font-weight: 600;
    color: var(--text-primary);
}

.step-details p {
    font-size: 0.76rem;
    color: var(--text-secondary);
}

.step-yellow {
    background: var(--google-yellow-light);
    color: var(--google-yellow-dark);
}

/* Visual Storytelling Section */
.viz-storytelling-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-top: 0.5rem;
}

.section-title-row h2 {
    font-family: 'Google Sans', sans-serif;
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-primary);
}

.section-title-row p {
    font-size: 0.88rem;
    color: var(--text-secondary);
}

.viz-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
    gap: 1.5rem;
}

.viz-card {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    position: relative;
    overflow: hidden;
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.full-width-viz {
    grid-column: 1 / -1;
}

.viz-desc {
    font-size: 0.84rem;
    color: var(--text-secondary);
}

.viz-container {
    background: var(--surface-variant);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 1rem;
    min-height: 140px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.empty-viz {
    text-align: center;
    color: var(--text-tertiary);
    font-size: 0.85rem;
    font-style: italic;
}

.viz-sub-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

/* Tokenizer Visualizer */
.token-chip-container {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
}

.token-chip {
    background: #ffffff;
    border: 1px solid var(--google-blue-border);
    border-radius: 4px;
    padding: 0.4rem 0.75rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: 'Roboto Mono', monospace;
    font-size: 0.82rem;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-md);
}

.token-chip:hover {
    border-color: var(--google-blue);
    background: var(--google-blue-light);
    transform: scale(1.04);
}

.token-chip.special-token {
    border-color: var(--google-red-border);
    background: var(--google-red-light);
    color: var(--google-red-hover);
}

.token-chip.subword-token {
    border-color: var(--google-yellow-border);
    background: var(--google-yellow-light);
    color: var(--google-yellow-dark);
}

.token-idx {
    font-size: 0.7rem;
    color: var(--text-tertiary);
    background: rgba(0,0,0,0.05);
    padding: 0.1rem 0.35rem;
    border-radius: 3px;
}

/* Self-Attention Visualizer */
.attn-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 0.85rem;
    font-size: 0.8rem;
}

.attn-head-select {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.attn-head-select label {
    font-weight: 500;
    color: var(--text-secondary);
}

.head-pills {
    display: flex;
    gap: 0.35rem;
}

.head-pill {
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0.25rem 0.55rem;
    font-size: 0.75rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.15s ease;
}

.head-pill.active, .head-pill:hover {
    background: var(--google-blue);
    color: #ffffff;
    border-color: var(--google-blue);
}

.attn-hint {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    font-style: italic;
}

.attn-arcs-wrapper {
    position: relative;
    height: 0;
}

.attn-matrix-table {
    display: grid;
    gap: 2px;
    background: var(--border-color);
    padding: 2px;
    border-radius: 4px;
    overflow-x: auto;
}

.attn-cell {
    background: #ffffff;
    padding: 0.4rem 0.5rem;
    font-size: 0.75rem;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Roboto Mono', monospace;
    user-select: none;
}

.attn-cell.corner-cell {
    background: var(--surface-variant);
    font-weight: bold;
    color: var(--text-tertiary);
}

.attn-cell.col-header, .attn-cell.row-header {
    background: var(--surface-variant);
    font-weight: 600;
    color: var(--text-secondary);
}

.attn-cell.weight-cell {
    cursor: pointer;
    transition: transform 0.15s ease;
}

.attn-cell.weight-cell:hover {
    transform: scale(1.15);
    z-index: 10;
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

/* Vector Barcode Fingerprint */
.barcode-wrapper {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    background: #ffffff;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

.barcode-canvas {
    width: 100%;
    height: 36px;
    border-radius: 3px;
    cursor: crosshair;
}

.norm-badge {
    font-size: 0.72rem;
    background: var(--google-green-light);
    color: var(--google-green-dark);
    padding: 0.15rem 0.45rem;
    border-radius: 3px;
    font-family: 'Roboto Mono', monospace;
}

/* 2D Embedding Space PCA Canvas (GAN Lab style) */
.pca-legend {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.legend-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    display: inline-block;
}

.legend-dot.star-dot {
    border: 2px solid #ffffff;
    box-shadow: 0 0 0 1px #1a73e8;
}

.canvas-wrapper {
    position: relative;
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

#pca-canvas {
    width: 100%;
    max-width: 860px;
    height: 420px;
    background: #fafafa;
}

.canvas-hint-overlay {
    position: absolute;
    bottom: 10px;
    right: 12px;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(4px);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0.3rem 0.65rem;
    font-size: 0.76rem;
    color: var(--text-secondary);
    pointer-events: none;
    box-shadow: var(--shadow-md);
}

/* Global Tooltip Popup */
.viz-tooltip {
    position: absolute;
    z-index: 9999;
    background: rgba(32, 33, 36, 0.94);
    color: #ffffff;
    padding: 0.6rem 0.85rem;
    border-radius: 6px;
    font-size: 0.78rem;
    line-height: 1.45;
    pointer-events: none;
    box-shadow: 0 6px 16px rgba(0,0,0,0.25);
    backdrop-filter: blur(6px);
    border: 1px solid rgba(255,255,255,0.15);
    display: none;
}

/* Forward Pass Pulse Highlight Animation */
.pulse-highlight {
    animation: pulseGlow 1.2s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes pulseGlow {
    0% {
        box-shadow: 0 0 0 0 rgba(26, 115, 232, 0.5);
        border-color: var(--google-blue);
    }
    50% {
        box-shadow: 0 0 0 10px rgba(26, 115, 232, 0);
        border-color: var(--google-blue);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(26, 115, 232, 0);
    }
}