/* Reset and base styles */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    /* Color palette - soft, muted tones */
    --bg: #fafaf9;
    --text: #1c1917;
    --text-muted: #78716c;
    --border: #e7e5e4;
    --accent: #0c4a6e;
    --accent-light: #e0f2fe;

    /* Language family colors - earthy, distinct */
    --lang-modern: #0284c7;      /* Modern languages (en, fr, de, etc.) */
    --lang-latin: #7c3aed;       /* Latin and Romance */
    --lang-greek: #059669;       /* Greek */
    --lang-germanic: #ea580c;    /* Proto-Germanic */
    --lang-pie: #dc2626;         /* Proto-Indo-European */
    --lang-semitic: #d97706;     /* Semitic languages */
    --lang-other: #64748b;       /* Other/unknown */

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

    /* Typography */
    --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-serif: 'EB Garamond', Garamond, 'Times New Roman', serif;
    --font-mono: ui-monospace, SFMono-Regular, 'SF Mono', Menlo, monospace;
}

html {
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: var(--space-lg);
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

/* Header */
header {
    text-align: center;
    margin-bottom: var(--space-lg);
    position: relative;
}

h1 {
    font-size: 2rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--text);
}

.subtitle {
    color: var(--text-muted);
    font-size: 1rem;
    margin-top: var(--space-xs);
}

/* Search */
.search-container {
    display: flex;
    gap: var(--space-sm);
    max-width: 480px;
    margin: 0 auto var(--space-xs);
    width: 100%;
}

.search-hint {
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: var(--space-md);
}

.search-wrapper {
    flex: 1;
    position: relative;
}

#word-input {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    font-size: 1rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: white;
    color: var(--text);
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}

/* Autocomplete suggestions */
.suggestions {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: white;
    border: 1px solid var(--border);
    border-top: none;
    border-radius: 0 0 8px 8px;
    max-height: 300px;
    overflow-y: auto;
    z-index: 100;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.suggestion-item {
    padding: var(--space-sm) var(--space-md);
    cursor: pointer;
    border-bottom: 1px solid var(--border);
}

.suggestion-item:last-child {
    border-bottom: none;
}

.suggestion-item:hover,
.suggestion-item.selected {
    background: var(--accent-light);
}

.suggestion-main {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: var(--space-sm);
}

.suggestion-word {
    font-weight: 500;
    color: var(--text);
}

.suggestion-ancestors {
    font-size: 0.75rem;
    color: var(--text-muted);
    white-space: nowrap;
}

.suggestion-ancestors.single {
    color: #d97706;
    font-style: italic;
}

.suggestion-sense {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-top: 2px;
}

#word-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-light);
}

#word-input::placeholder {
    color: var(--text-muted);
}

button {
    padding: var(--space-sm) var(--space-md);
    border: 1px solid var(--border);
    border-radius: 8px;
    background: white;
    color: var(--text);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s, border-color 0.2s;
}

button:hover {
    background: var(--bg);
    border-color: var(--text-muted);
}

button:active {
    transform: translateY(1px);
}

#search-btn {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
}

#search-btn:hover {
    background: #0369a1;
    border-color: #0369a1;
}

/* Graph container */
#graph-container {
    flex: 1;
    min-height: 400px;
    background: white;
    border: 1px solid var(--border);
    border-radius: 12px;
    position: relative;
    overflow: hidden;
}

#cy {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
}

/* Cytoscape HTML node labels */
.cy-node-html-label {
    pointer-events: none;
}

.cy-node-label {
    text-align: center;
    padding: 8px 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.node-lang {
    font-family: system-ui, -apple-system, sans-serif;
    font-size: 10px;
    font-weight: 600;
    color: #78716c;
    text-transform: lowercase;
    margin-bottom: 4px;
}

.node-word {
    font-family: 'EB Garamond', Garamond, serif;
    font-size: 18px;
    font-weight: 600;
    color: #1c1917;
    line-height: 1.2;
}

.node-sense {
    font-family: 'EB Garamond', Garamond, serif;
    font-size: 11px;
    font-style: italic;
    color: #78716c;
    margin-top: 4px;
    line-height: 1.3;
    max-width: 140px;
}

/* States */
#empty-state,
#error-state,
#loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: var(--text-muted);
}

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

#error-state {
    color: #dc2626;
}

.hidden {
    display: none !important;
}

/* Loading spinner */
#loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
}

.spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Word info bar */
#word-info {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-sm) var(--space-md);
    margin-top: var(--space-md);
    padding: var(--space-sm) var(--space-md);
    background: white;
    border: 1px solid var(--border);
    border-radius: 8px;
}

#current-word {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text);
}

.info-divider {
    width: 1px;
    height: 1.25rem;
    background: var(--border);
}

#lang-breakdown {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs) var(--space-sm);
    font-size: 0.8rem;
    color: var(--text-muted);
}

.lang-chip {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 8px;
    background: var(--bg);
    border-radius: 12px;
}

.lang-chip-name {
    color: var(--text);
}

.lang-chip-count {
    color: var(--text-muted);
    font-size: 0.75rem;
}

/* Node detail panel */
#node-detail {
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    background: white;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: var(--space-md);
    min-width: 220px;
    max-width: 300px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    z-index: 10;
    font-family: var(--font-serif);
}

#detail-close {
    position: absolute;
    top: var(--space-xs);
    right: var(--space-xs);
    padding: var(--space-xs);
    border: none;
    background: transparent;
    cursor: pointer;
    color: var(--text-muted);
    border-radius: 4px;
}

#detail-close:hover {
    background: var(--bg);
    color: var(--text);
}

.detail-header {
    margin-bottom: var(--space-sm);
    padding-right: var(--space-lg);
}

.detail-lang {
    display: block;
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-xs);
}

.detail-word {
    display: block;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text);
    line-height: 1.2;
}

.detail-row {
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding: var(--space-sm) 0;
    border-top: 1px solid var(--border);
}

.detail-row .detail-label {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-family: var(--font-sans);
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.detail-value {
    font-size: 1rem;
    color: var(--text);
}

.detail-row:last-child .detail-value {
    font-style: italic;
}

/* Info tooltip button */
.info-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--border);
    color: var(--text-muted);
    font-size: 0.6rem;
    font-weight: 600;
    font-family: var(--font-sans);
    cursor: help;
    border: none;
    padding: 0;
    position: relative;
}

.info-btn:hover {
    background: var(--text-muted);
    color: white;
}

.info-btn .tooltip {
    display: none;
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--text);
    color: white;
    font-size: 0.75rem;
    font-weight: 400;
    text-transform: none;
    letter-spacing: normal;
    padding: var(--space-xs) var(--space-sm);
    border-radius: 4px;
    white-space: nowrap;
    margin-bottom: 4px;
    z-index: 20;
}

.info-btn:hover .tooltip {
    display: block;
}

/* Direction indicator */
#direction-indicator {
    position: absolute;
    bottom: var(--space-md);
    left: var(--space-md);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-xs) var(--space-sm);
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.7rem;
    color: var(--text-muted);
    z-index: 5;
    backdrop-filter: blur(4px);
}

#direction-indicator.vertical {
    flex-direction: column;
    padding: var(--space-sm) var(--space-xs);
}

.direction-label {
    font-family: var(--font-sans);
    letter-spacing: 0.02em;
}

.direction-arrow {
    color: var(--text-muted);
    font-size: 1rem;
    line-height: 1;
}

/* About button */
.about-btn {
    position: absolute;
    top: 0;
    right: 0;
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-xs) var(--space-sm);
    font-size: 0.875rem;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-muted);
    cursor: pointer;
}

.about-btn:hover {
    background: var(--bg);
    color: var(--text);
}

/* Modal */
.modal {
    position: fixed;
    inset: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-md);
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
}

.modal-content {
    position: relative;
    background: white;
    border-radius: 12px;
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
    padding: var(--space-lg);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.modal-close {
    position: absolute;
    top: var(--space-sm);
    right: var(--space-sm);
    padding: var(--space-xs);
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: 4px;
}

.modal-close:hover {
    background: var(--bg);
    color: var(--text);
}

.modal-tabs {
    display: flex;
    gap: var(--space-xs);
    margin-bottom: var(--space-md);
    border-bottom: 1px solid var(--border);
    padding-bottom: var(--space-sm);
}

.modal-tab {
    padding: var(--space-xs) var(--space-sm);
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 0.875rem;
    border-radius: 4px;
}

.modal-tab:hover {
    background: var(--bg);
}

.modal-tab.active {
    background: var(--accent-light);
    color: var(--accent);
    font-weight: 500;
}

.tab-content {
    display: none;
}

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

.tab-content h2 {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    margin-bottom: var(--space-md);
}

.tab-content h3 {
    font-size: 1rem;
    margin-top: var(--space-md);
    margin-bottom: var(--space-sm);
    color: var(--text);
}

.tab-content p {
    margin-bottom: var(--space-sm);
    line-height: 1.7;
    color: var(--text);
}

.tab-content .philosophy {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-style: italic;
    margin-bottom: var(--space-md);
}

.tab-content .citation {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-style: italic;
}

.tab-content ol,
.tab-content ul {
    margin-bottom: var(--space-sm);
    padding-left: var(--space-lg);
    line-height: 1.8;
}

.tab-content li {
    margin-bottom: var(--space-xs);
}

.tab-content a {
    color: var(--accent);
}

/* Footer */
footer {
    text-align: center;
    padding: var(--space-md);
    color: var(--text-muted);
    font-size: 0.875rem;
}

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

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

/* Responsive */
@media (max-width: 640px) {
    main {
        padding: var(--space-sm);
    }

    header {
        margin-bottom: var(--space-md);
    }

    h1 {
        font-size: 1.5rem;
        padding-right: 70px; /* Space for about button */
    }

    .subtitle {
        font-size: 0.875rem;
    }

    .about-btn {
        padding: var(--space-xs);
        font-size: 0.75rem;
    }

    .about-btn svg {
        width: 14px;
        height: 14px;
    }

    /* Keep search on one row with compact buttons */
    .search-container {
        gap: var(--space-xs);
        margin-bottom: var(--space-xs);
    }

    .search-hint {
        font-size: 0.7rem;
        margin-bottom: var(--space-sm);
    }

    #word-input {
        padding: var(--space-xs) var(--space-sm);
        font-size: 0.9rem;
    }

    #search-btn,
    #random-btn {
        padding: var(--space-xs) var(--space-sm);
        min-width: 44px;
    }

    #search-btn svg,
    #random-btn svg {
        width: 18px;
        height: 18px;
    }

    /* Graph takes more space */
    #graph-container {
        min-height: 50vh;
        flex: 1;
    }

    /* Direction indicator smaller */
    #direction-indicator {
        font-size: 0.6rem;
        padding: 4px 6px;
        bottom: var(--space-sm);
        left: var(--space-sm);
    }

    /* Detail panel full width at bottom on mobile */
    #node-detail {
        position: fixed;
        top: auto;
        bottom: 0;
        left: 0;
        right: 0;
        max-width: none;
        min-width: auto;
        border-radius: 12px 12px 0 0;
        padding: var(--space-sm) var(--space-md);
        box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.15);
    }

    .detail-word {
        font-size: 1.25rem;
    }

    .detail-row {
        padding: var(--space-xs) 0;
    }

    /* Info bar more compact */
    #word-info {
        padding: var(--space-xs) var(--space-sm);
        gap: var(--space-xs) var(--space-sm);
        margin-top: var(--space-sm);
    }

    #current-word {
        font-size: 1rem;
    }

    #lang-breakdown {
        font-size: 0.7rem;
    }

    .lang-chip {
        padding: 1px 6px;
    }

    /* Modal adjustments */
    .modal-content {
        padding: var(--space-md);
        max-height: 90vh;
    }

    .tab-content h2 {
        font-size: 1.25rem;
    }

    footer {
        padding: var(--space-sm);
        font-size: 0.75rem;
    }
}