/* ==========================================================================
   Erdős Path — Stylesheet
   Academic Archive Aesthetic
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties
   -------------------------------------------------------------------------- */
:root {
    /* Colors - Warm academic palette */
    --color-paper: #f8f5f0;
    --color-paper-dark: #efe9e1;
    --color-ink: #1a2332;
    --color-ink-light: #3d4a5c;
    --color-ink-muted: #6b7280;
    --color-accent: #b45309;
    --color-accent-light: #d97706;
    --color-accent-pale: #fef3c7;
    --color-success: #065f46;
    --color-success-bg: #d1fae5;
    --color-error: #991b1b;
    --color-error-bg: #fee2e2;
    --color-edge: #9ca3af;
    --color-node: #374151;

    /* Typography */
    --font-display: 'Crimson Pro', Georgia, 'Times New Roman', serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
    --font-body: 'Source Sans 3', 'Segoe UI', system-ui, sans-serif;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(26, 35, 50, 0.05);
    --shadow-md: 0 4px 12px rgba(26, 35, 50, 0.08);
    --shadow-lg: 0 8px 24px rgba(26, 35, 50, 0.12);

    /* Border radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
}

/* --------------------------------------------------------------------------
   Reset & Base
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-ink);
    background-color: var(--color-paper);
    min-height: 100vh;
    position: relative;
}

/* Paper texture overlay */
.page-texture {
    position: fixed;
    inset: 0;
    pointer-events: none;
    opacity: 0.15;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
    z-index: -1;
    mix-blend-mode: multiply;
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-accent-light);
    text-decoration: underline;
}

button {
    font-family: inherit;
    cursor: pointer;
}

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */
.container {
    max-width: 640px;
    margin: 0 auto;
    padding: var(--space-xl) var(--space-lg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */
.header {
    text-align: center;
    margin-bottom: var(--space-3xl);
    animation: fadeInUp 600ms ease-out;
}

.graph-motif {
    margin-bottom: var(--space-lg);
}

.header-graph {
    width: 100px;
    height: 50px;
}

.header-graph .node {
    fill: var(--color-node);
    animation: pulse 3s ease-in-out infinite;
}

.header-graph .node:nth-child(2) { animation-delay: 0.5s; }
.header-graph .node:nth-child(3) { animation-delay: 1s; }
.header-graph .node:nth-child(4) { animation-delay: 1.5s; }

.header-graph .edge {
    stroke: var(--color-edge);
    stroke-width: 1.5;
    fill: none;
}

.title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 8vw, 3.5rem);
    font-weight: 600;
    color: var(--color-ink);
    letter-spacing: -0.02em;
    line-height: 1.1;
    margin-bottom: var(--space-sm);
}

.tagline {
    font-family: var(--font-display);
    font-size: 1.125rem;
    font-style: italic;
    color: var(--color-ink-muted);
    max-width: 32ch;
    margin: 0 auto;
}

/* --------------------------------------------------------------------------
   Search Form
   -------------------------------------------------------------------------- */
.search-section {
    animation: fadeInUp 600ms ease-out 100ms backwards;
}

.search-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.input-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-ink);
    letter-spacing: 0.025em;
}

.input-label-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
}

/* Famous scientists quick-select */
.famous-scientists-wrapper {
    margin-top: var(--space-xs);
    margin-bottom: var(--space-sm);
}

.famous-toggle {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-ink-muted);
    background: none;
    border: none;
    padding: var(--space-xs) 0;
    cursor: pointer;
    transition: color var(--transition-fast);
}

.famous-toggle:hover {
    color: var(--color-accent);
}

.famous-toggle-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 16px;
    height: 16px;
    font-size: 0.875rem;
    font-weight: 500;
    border: 1px solid currentColor;
    border-radius: 3px;
    transition: transform var(--transition-fast);
}

.famous-toggle.open .famous-toggle-icon {
    transform: rotate(45deg);
}

.famous-scientists {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    padding-top: var(--space-sm);
    animation: slideDown 200ms ease-out;
}

.famous-scientists[hidden] {
    display: none;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.scientist-btn {
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    font-weight: 500;
    padding: 3px 8px;
    background-color: var(--color-paper-dark);
    color: var(--color-ink-light);
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.scientist-btn:hover:not(:disabled) {
    background-color: var(--color-accent-pale);
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.scientist-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.scientist-btn .field-tag {
    font-size: 0.5625rem;
    opacity: 0.7;
    margin-left: 2px;
}

.input-wrapper {
    position: relative;
}

.author-input {
    width: 100%;
    font-family: var(--font-body);
    font-size: 1rem;
    padding: var(--space-md) var(--space-lg);
    border: 2px solid var(--color-paper-dark);
    border-radius: var(--radius-md);
    background-color: white;
    color: var(--color-ink);
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
}

.author-input::placeholder {
    color: var(--color-ink-muted);
    opacity: 0.6;
}

.author-input:hover {
    border-color: var(--color-edge);
}

.author-input:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px var(--color-accent-pale);
}

.author-input.invalid {
    border-color: var(--color-error);
}

.input-hint {
    display: block;
    margin-top: var(--space-xs);
    font-size: 0.8125rem;
    color: var(--color-ink-muted);
}

.input-hint a {
    color: var(--color-accent);
}

/* Search OpenAlex button */
.search-openalex-btn {
    background: none;
    border: none;
    color: var(--color-accent);
    font-family: inherit;
    font-size: inherit;
    padding: 0;
    cursor: pointer;
    text-decoration: underline;
    text-decoration-style: dotted;
    text-underline-offset: 2px;
}

.search-openalex-btn:hover {
    text-decoration-style: solid;
}

/* Author Search Modal */
.search-modal {
    border: none;
    border-radius: var(--radius-lg);
    padding: 0;
    max-width: 500px;
    width: 90vw;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    background: var(--color-paper);
}

.search-modal::backdrop {
    background: rgba(0, 0, 0, 0.5);
}

.modal-content {
    padding: var(--space-lg);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-lg);
}

.modal-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-ink);
    margin: 0;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--color-ink-muted);
    cursor: pointer;
    padding: var(--space-xs);
    line-height: 1;
}

.modal-close:hover {
    color: var(--color-ink);
}

.modal-search {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.modal-search-input {
    flex: 1;
    padding: var(--space-sm) var(--space-md);
    font-family: inherit;
    font-size: 1rem;
    border: 1px solid var(--color-edge);
    border-radius: var(--radius-md);
    background: var(--color-paper-light);
}

.modal-search-input:focus {
    outline: none;
    border-color: var(--color-accent);
}

.btn-small {
    padding: var(--space-sm) var(--space-md);
    font-size: 0.875rem;
}

.modal-results {
    max-height: 300px;
    overflow-y: auto;
}

.modal-results-hint {
    color: var(--color-ink-muted);
    font-size: 0.875rem;
    text-align: center;
    padding: var(--space-lg);
}

.modal-result-item {
    display: block;
    width: 100%;
    text-align: left;
    padding: var(--space-md);
    background: var(--color-paper-light);
    border: 1px solid var(--color-edge);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.modal-result-item:hover {
    border-color: var(--color-accent);
    background: var(--color-paper);
}

.modal-result-name {
    font-weight: 600;
    color: var(--color-ink);
    margin-bottom: var(--space-xs);
}

.modal-result-affiliation {
    font-size: 0.875rem;
    color: var(--color-ink-muted);
    margin-bottom: var(--space-xs);
}

.modal-result-stats {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-ink-faint);
}

.modal-result-papers {
    margin-top: 0.5rem;
    padding-top: 0.5rem;
    border-top: 1px dashed var(--color-border);
}

.modal-result-papers .papers-label {
    font-size: 0.7rem;
    color: var(--color-ink-faint);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    display: block;
    margin-bottom: 0.25rem;
}

.modal-result-papers .paper-item {
    font-size: 0.8rem;
    color: var(--color-ink-light);
    line-height: 1.4;
    margin-bottom: 0.15rem;
    font-style: italic;
}

.modal-loading {
    text-align: center;
    padding: var(--space-lg);
    color: var(--color-ink-muted);
}

.modal-no-results {
    text-align: center;
    padding: var(--space-lg);
    color: var(--color-ink-muted);
}

/* Path connector between inputs */
.path-connector {
    display: flex;
    justify-content: center;
    padding: var(--space-xs) 0;
}

.connector-svg {
    width: 24px;
    height: 48px;
}

.connector-line {
    stroke: var(--color-edge);
    stroke-width: 1.5;
    fill: none;
}

.connector-dot {
    fill: var(--color-edge);
}

/* Deep search toggle */
.deep-search-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    margin-top: var(--space-md);
    padding: var(--space-sm) var(--space-md);
    background-color: var(--color-paper-dark);
    border-radius: var(--radius-sm);
}

.deep-search-toggle input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--color-accent);
    cursor: pointer;
}

.deep-search-toggle label {
    font-size: 0.875rem;
    color: var(--color-ink-light);
    cursor: pointer;
    user-select: none;
}

.deep-search-toggle .coffee-icon {
    font-size: 1rem;
}

.deep-search-warning {
    display: none;
    margin-top: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background-color: var(--color-accent-pale);
    border: 1px solid var(--color-accent);
    border-radius: var(--radius-sm);
    font-size: 0.8125rem;
    color: var(--color-accent);
    text-align: center;
}

.deep-search-warning.visible {
    display: block;
    animation: fadeIn 200ms ease-out;
}

/* Keyboard hint */
.keyboard-hint {
    text-align: center;
    font-size: 0.75rem;
    color: var(--color-ink-muted);
    margin-top: var(--space-md);
}

.keyboard-hint kbd {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    padding: 2px 6px;
    background-color: var(--color-paper-dark);
    border: 1px solid var(--color-edge);
    border-radius: 3px;
    box-shadow: 0 1px 0 var(--color-edge);
}

/* Buttons */
.button-group {
    display: flex;
    gap: var(--space-md);
    margin-top: var(--space-lg);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-xl);
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: 2px solid transparent;
    transition: all var(--transition-base);
}

.btn-primary {
    flex: 1;
    background-color: var(--color-ink);
    color: white;
    border-color: var(--color-ink);
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--color-ink-light);
    border-color: var(--color-ink-light);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-ink-muted);
    border-color: var(--color-paper-dark);
}

.btn-secondary:hover {
    border-color: var(--color-ink-muted);
    color: var(--color-ink);
}

.btn-tertiary {
    background-color: transparent;
    color: var(--color-accent);
    border: none;
    padding: var(--space-sm) var(--space-md);
}

.btn-tertiary:hover {
    background-color: var(--color-accent-pale);
}

.btn-icon {
    width: 20px;
    height: 20px;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
    fill: none;
}

.btn-icon-left {
    width: 18px;
    height: 18px;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
    fill: none;
}

/* --------------------------------------------------------------------------
   Status Section
   -------------------------------------------------------------------------- */
.status-section {
    margin-top: var(--space-2xl);
    animation: fadeIn 300ms ease-out;
}

.status-card {
    text-align: center;
    padding: var(--space-2xl);
    background-color: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.status-animation {
    margin-bottom: var(--space-lg);
}

.search-animation {
    width: 100px;
    height: 100px;
}

.search-node {
    fill: var(--color-node);
}

.search-node-left {
    animation: searchPulseLeft 2s ease-in-out infinite;
}

.search-node-right {
    animation: searchPulseRight 2s ease-in-out infinite;
}

.search-node-center {
    fill: var(--color-accent);
    animation: searchPulseCenter 2s ease-in-out infinite;
}

.search-wave {
    stroke: var(--color-edge);
    stroke-width: 2;
    fill: none;
    stroke-dasharray: 4 4;
}

.search-wave-left {
    animation: waveLeft 1s linear infinite;
}

.search-wave-right {
    animation: waveRight 1s linear infinite;
}

.status-text {
    font-family: var(--font-display);
    font-size: 1.25rem;
    color: var(--color-ink);
    margin-bottom: var(--space-sm);
}

.status-details {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--color-ink-muted);
}

.status-separator {
    color: var(--color-edge);
}

.status-currently {
    margin-top: var(--space-md);
    font-size: 0.8125rem;
    color: var(--color-ink-muted);
    font-style: italic;
    animation: fadeIn 200ms ease-out;
}

.status-milestone {
    margin-top: var(--space-md);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-accent);
    animation: fadeIn 200ms ease-out;
}

.status-milestone.milestone-pop {
    animation: milestonePop 500ms ease-out;
}

@keyframes milestonePop {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.status-funfact {
    margin-top: var(--space-lg);
    padding: var(--space-md) var(--space-lg);
    font-size: 0.8125rem;
    color: var(--color-ink-muted);
    background: var(--color-paper-dark);
    border-radius: var(--radius-md);
    max-width: 45ch;
    margin-inline: auto;
    animation: factFadeIn 500ms ease-out;
}

.status-funfact.quote {
    font-style: italic;
    border-left: 2px solid var(--color-accent);
    background: transparent;
}

@keyframes factFadeIn {
    from {
        opacity: 0;
        transform: translateY(5px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.optimizer-status {
    margin-top: var(--space-xs);
    font-size: 0.75rem;
    color: var(--color-ink-muted);
    font-style: italic;
}

.optimizer-status::before {
    content: '';
    display: inline-block;
    width: 8px;
    height: 8px;
    margin-right: var(--space-xs);
    border: 1.5px solid var(--color-accent);
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.optimizer-status.improved {
    color: var(--color-success, #2e7d32);
    font-weight: 500;
    font-style: normal;
    animation: improvementPop 500ms ease-out;
}

.optimizer-status.improved::before {
    content: '✓';
    border: none;
    animation: none;
    font-size: 0.875rem;
}

@keyframes improvementPop {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

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

/* --------------------------------------------------------------------------
   Error Section
   -------------------------------------------------------------------------- */
.error-section {
    margin-top: var(--space-2xl);
    animation: fadeIn 300ms ease-out;
}

.error-card {
    text-align: center;
    padding: var(--space-2xl);
    background-color: var(--color-error-bg);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(153, 27, 27, 0.2);
}

.error-icon {
    color: var(--color-error);
    margin-bottom: var(--space-md);
}

.error-icon svg {
    width: 48px;
    height: 48px;
}

.error-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-error);
    margin-bottom: var(--space-sm);
}

.error-message {
    color: var(--color-ink-light);
    margin-bottom: var(--space-lg);
    max-width: 40ch;
    margin-left: auto;
    margin-right: auto;
}

/* --------------------------------------------------------------------------
   Disambiguation Section
   -------------------------------------------------------------------------- */
.disambiguation-card {
    text-align: center;
    padding: var(--space-2xl);
    background-color: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.disambiguation-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-ink);
    margin-bottom: var(--space-xs);
}

.disambiguation-subtitle {
    color: var(--color-ink-muted);
    margin-bottom: var(--space-lg);
}

.disambiguation-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.disambiguation-option {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-xs);
    padding: var(--space-md) var(--space-lg);
    background-color: var(--color-paper);
    border: 2px solid var(--color-paper-dark);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    text-align: left;
    width: 100%;
}

.disambiguation-option:hover {
    border-color: var(--color-accent);
    background-color: var(--color-accent-pale);
}

.disambiguation-name {
    font-family: var(--font-display);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-ink);
}

.disambiguation-affiliation {
    font-size: 0.875rem;
    color: var(--color-ink-light);
}

.disambiguation-stats {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-ink-muted);
}

/* --------------------------------------------------------------------------
   Results Section
   -------------------------------------------------------------------------- */
.results-section {
    margin-top: var(--space-2xl);
    animation: fadeInUp 400ms ease-out;
}

.results-header {
    text-align: center;
    margin-bottom: var(--space-2xl);
}

.distance-badge {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    padding: var(--space-md) var(--space-xl);
    background-color: var(--color-success-bg);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-md);
}

.distance-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-success);
}

.distance-value {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 700;
    color: var(--color-success);
    line-height: 1;
}

.results-subtitle {
    font-family: var(--font-display);
    font-style: italic;
    color: var(--color-ink-muted);
}

/* Path Visualization */
.path-visualization {
    display: flex;
    flex-direction: column;
    gap: 0;
    margin-bottom: var(--space-2xl);
}

.path-node {
    position: relative;
    padding: var(--space-lg);
    background-color: white;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    animation: fadeInUp 400ms ease-out backwards;
    transition: box-shadow var(--transition-base);
}

.path-node:hover {
    box-shadow: var(--shadow-md);
}

.path-node:nth-child(1) { animation-delay: 100ms; }
.path-node:nth-child(2) { animation-delay: 200ms; }
.path-node:nth-child(3) { animation-delay: 300ms; }
.path-node:nth-child(4) { animation-delay: 400ms; }
.path-node:nth-child(5) { animation-delay: 500ms; }
.path-node:nth-child(6) { animation-delay: 600ms; }
.path-node:nth-child(7) { animation-delay: 700ms; }

.path-node::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 12px;
    height: 12px;
    background-color: var(--color-node);
    border-radius: 50%;
    border: 3px solid var(--color-paper);
    z-index: 2;
}

.path-node:first-child::before,
.path-node:last-child::before {
    background-color: var(--color-accent);
}

.path-node:not(:last-child)::before {
    top: -6px;
}

.path-node:last-child::before {
    bottom: -6px;
}

.path-node:only-child::before {
    top: -6px;
}

.author-info {
    text-align: center;
}

.author-name {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-ink);
    margin-bottom: var(--space-xs);
}

.author-name a {
    color: inherit;
}

.author-name a:hover {
    color: var(--color-accent);
}

.author-affiliation {
    font-size: 0.875rem;
    color: var(--color-ink-muted);
}

.affiliation-source {
    font-size: 0.75rem;
    color: var(--color-ink-faint);
    font-style: italic;
}

.author-meta {
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    color: var(--color-ink-faint);
    margin-top: var(--space-xs);
}

.author-id {
    opacity: 0.7;
}

.author-citations {
    color: var(--color-ink-muted);
}

/* Institution mismatch warning (merged profile indicator) */
.path-node.institution-mismatch {
    border-color: var(--color-warning, #d4a017);
    background-color: rgba(212, 160, 23, 0.05);
}

.mismatch-warning {
    display: inline-block;
    color: var(--color-warning, #d4a017);
    font-size: 0.875rem;
    margin-left: 0.25em;
    cursor: help;
    vertical-align: middle;
}

/* Auto-corrected author (validated and fixed) */
.path-node.corrected-author {
    border-color: var(--color-success, #2e7d32);
    background-color: rgba(46, 125, 50, 0.05);
}

.corrected-indicator {
    display: inline-block;
    color: var(--color-success, #2e7d32);
    font-size: 0.875rem;
    margin-left: 0.25em;
    cursor: help;
    vertical-align: middle;
}

/* Suspicious author (could not verify) */
.path-node.suspicious-author {
    border-color: var(--color-error, #c62828);
    background-color: rgba(198, 40, 40, 0.05);
}

.suspicious-warning {
    display: inline-block;
    color: var(--color-error, #c62828);
    font-size: 0.875rem;
    margin-left: 0.25em;
    cursor: help;
    vertical-align: middle;
}

/* Path Edge (paper connection) */
.path-edge {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-lg) var(--space-md);
    position: relative;
    animation: fadeIn 400ms ease-out backwards;
}

.path-edge:nth-child(2) { animation-delay: 150ms; }
.path-edge:nth-child(4) { animation-delay: 350ms; }
.path-edge:nth-child(6) { animation-delay: 550ms; }

.path-edge::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: repeating-linear-gradient(
        to bottom,
        var(--color-edge) 0,
        var(--color-edge) 4px,
        transparent 4px,
        transparent 8px
    );
}

.paper-info {
    position: relative;
    z-index: 1;
    background-color: var(--color-paper);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    text-align: center;
    max-width: 90%;
}

.paper-title {
    font-family: var(--font-display);
    font-size: 0.9375rem;
    font-style: italic;
    color: var(--color-ink-light);
    line-height: 1.4;
}

.paper-title a {
    color: inherit;
}

.paper-title a:hover {
    color: var(--color-accent);
}

.paper-year {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-ink-muted);
    margin-top: var(--space-xs);
}

.paper-connection {
    font-size: 0.75rem;
    color: var(--color-ink-muted);
    margin-top: var(--space-xs);
}

.connection-authors {
    font-family: var(--font-sans);
}

.connection-affil {
    font-size: 0.6875rem;
    color: var(--color-ink-faint);
}

.exclude-btn {
    display: inline-block;
    margin-top: var(--space-xs);
    padding: 2px 8px;
    font-family: var(--font-sans);
    font-size: 0.6875rem;
    font-style: italic;
    color: var(--color-ink-muted);
    background: transparent;
    border: none;
    cursor: pointer;
    opacity: 0;
    transition: all var(--transition-fast);
}

.path-edge:hover .exclude-btn {
    opacity: 1;
}

.exclude-btn:hover {
    color: var(--color-accent);
    text-decoration: underline;
}

/* Wrong person button on author nodes */
.exclude-author-btn {
    display: block;
    margin-top: var(--space-sm);
    padding: 4px 12px;
    font-family: var(--font-body);
    font-size: 0.75rem;
    color: var(--color-ink-muted);
    background: var(--color-paper);
    border: 1px dashed var(--color-edge);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.exclude-author-btn:hover {
    color: var(--color-error);
    border-color: var(--color-error);
    background: var(--color-error-bg);
}

/* Alternative paths */
.alt-paths-section {
    margin-top: var(--space-xl);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-paper-dark);
    animation: fadeIn 300ms ease-out;
}

.alt-paths-title {
    font-size: 0.875rem;
    color: var(--color-ink-muted);
    margin-bottom: var(--space-sm);
    text-align: center;
}

.alt-paths-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    justify-content: center;
}

.alt-path-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: var(--space-sm) var(--space-md);
    background-color: var(--color-paper);
    border: 1px solid var(--color-paper-dark);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: inherit;
}

.alt-path-item:hover {
    border-color: var(--color-accent);
    background-color: var(--color-accent-pale);
}

.alt-path-item.active {
    border-color: var(--color-accent);
    background-color: var(--color-accent);
    color: white;
}

.alt-path-item.active .alt-path-label {
    color: white;
}

.alt-path-item.active .alt-path-via {
    color: rgba(255, 255, 255, 0.8);
}

.alt-path-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-ink);
}

.alt-path-via {
    font-size: 0.6875rem;
    color: var(--color-ink-muted);
    font-style: italic;
}

/* Exclusions notice */
.exclusions-notice {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    margin-top: var(--space-lg);
    padding: var(--space-sm) var(--space-md);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-ink-muted);
    background: var(--color-paper-dark);
    border-radius: var(--radius-sm);
}

.clear-exclusions-btn {
    padding: 2px 8px;
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    color: var(--color-accent);
    background: white;
    border: 1px solid var(--color-accent);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.clear-exclusions-btn:hover {
    background: var(--color-accent);
    color: white;
}

/* Results actions */
.results-actions {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    margin-top: var(--space-xl);
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.footer {
    margin-top: auto;
    padding-top: var(--space-3xl);
    text-align: center;
}

.footer-text {
    font-size: 0.875rem;
    color: var(--color-ink-muted);
}

.disclaimer {
    margin-top: var(--space-lg);
    font-size: 0.8125rem;
    color: var(--color-ink-faint);
}

.disclaimer summary {
    cursor: pointer;
    font-style: italic;
    transition: color var(--transition-fast);
}

.disclaimer summary:hover {
    color: var(--color-ink-muted);
}

.disclaimer summary::marker {
    color: var(--color-ink-faint);
}

.disclaimer p {
    margin-top: var(--space-sm);
    max-width: 50ch;
    margin-inline: auto;
    line-height: 1.6;
    text-align: left;
}

/* --------------------------------------------------------------------------
   Animations
   -------------------------------------------------------------------------- */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

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

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.1);
        opacity: 0.8;
    }
}

@keyframes searchPulseLeft {
    0%, 100% {
        transform: translateX(0);
    }
    50% {
        transform: translateX(8px);
    }
}

@keyframes searchPulseRight {
    0%, 100% {
        transform: translateX(0);
    }
    50% {
        transform: translateX(-8px);
    }
}

@keyframes searchPulseCenter {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.3);
        opacity: 0.7;
    }
}

@keyframes waveLeft {
    0% {
        stroke-dashoffset: 0;
    }
    100% {
        stroke-dashoffset: -16;
    }
}

@keyframes waveRight {
    0% {
        stroke-dashoffset: 0;
    }
    100% {
        stroke-dashoffset: 16;
    }
}

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */
@media (max-width: 480px) {
    .container {
        padding: var(--space-lg) var(--space-md);
    }

    .orcid-input {
        font-size: 1rem;
        padding: var(--space-md);
    }

    .btn {
        padding: var(--space-md) var(--space-lg);
    }

    .button-group {
        flex-direction: column;
    }

    .status-card {
        padding: var(--space-xl);
    }

    .path-node {
        padding: var(--space-md);
    }

    .author-name {
        font-size: 1.125rem;
    }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* --------------------------------------------------------------------------
   Search Options (Erdős mode, deep search)
   -------------------------------------------------------------------------- */
.search-options {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md) var(--space-xl);
    margin-bottom: var(--space-md);
}

.search-option {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.search-option input[type="checkbox"] {
    width: 1.125rem;
    height: 1.125rem;
    accent-color: var(--color-accent);
}

.search-option label {
    font-size: 0.9375rem;
    color: var(--color-ink-light);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.option-icon {
    font-size: 1rem;
}

/* --------------------------------------------------------------------------
   Random Path Button
   -------------------------------------------------------------------------- */
.random-path-wrapper {
    text-align: center;
    margin-top: var(--space-lg);
    padding-top: var(--space-lg);
    border-top: 1px dashed var(--color-edge);
}

.btn-ghost {
    background: transparent;
    border: 1px dashed var(--color-edge);
    color: var(--color-ink-muted);
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-ghost:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    background: var(--color-accent-pale);
}

/* --------------------------------------------------------------------------
   Suggestions Section
   -------------------------------------------------------------------------- */
.suggestions-section {
    margin-top: var(--space-xl);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-paper-dark);
}

.suggestions-title {
    font-size: 0.875rem;
    color: var(--color-ink-muted);
    margin-bottom: var(--space-md);
    font-weight: 500;
}

.suggestions-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.suggestion-btn {
    background: var(--color-paper);
    border: 1px solid var(--color-paper-dark);
    border-radius: var(--radius-md);
    padding: var(--space-sm) var(--space-md);
    font-family: var(--font-body);
    font-size: 0.8125rem;
    color: var(--color-ink-light);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.suggestion-btn:hover {
    background: var(--color-accent-pale);
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.suggestion-field {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   Connection Strength Indicator
   -------------------------------------------------------------------------- */
.connection-strength {
    display: inline-flex;
    align-items: center;
    gap: 2px;
    margin-left: var(--space-sm);
    font-size: 0.75rem;
    color: var(--color-ink-muted);
}

.strength-bar {
    width: 3px;
    height: 8px;
    background: var(--color-edge);
    border-radius: 1px;
}

.strength-bar.filled {
    background: var(--color-accent);
}

/* --------------------------------------------------------------------------
   Field Color Dots
   -------------------------------------------------------------------------- */
.field-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    display: inline-block;
    margin-right: var(--space-xs);
    flex-shrink: 0;
}

.author-field {
    font-size: 0.75rem;
    color: var(--color-ink-muted);
    margin-top: 2px;
}

/* Path quality indicator */
.path-quality {
    font-size: 0.75rem;
    color: var(--color-ink-muted);
    margin-left: var(--space-sm);
}

.path-quality.high { color: var(--color-success); }
.path-quality.medium { color: var(--color-accent); }

/* --------------------------------------------------------------------------
   Erdős Mode Active State
   -------------------------------------------------------------------------- */
.author-input.erdos-mode-active {
    background: var(--color-accent-pale);
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.author-input.erdos-mode-active::placeholder {
    color: var(--color-accent);
    opacity: 0.7;
}