:root {
    --bg: #0d1117;
    --surface: #161b22;
    --border: #30363d;
    --text: #c9d1d9;
    --text-muted: #8b949e;
    --accent: #58a6ff;
    --accent-hover: #79c0ff;
    --green: #3fb950;
    --red: #f85149;
    --orange: #d29922;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

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

/* Layout */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* Nav */
nav {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 12px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}
nav .container { display: flex; align-items: center; gap: 24px; }
nav .brand { font-size: 18px; font-weight: 700; color: var(--text); }
nav .brand span { color: var(--accent); }
nav .links { display: flex; gap: 20px; }
nav .links a { color: var(--text-muted); font-size: 14px; font-weight: 500; }
nav .links a:hover, nav .links a.active { color: var(--text); text-decoration: none; }

/* Hero */
.hero {
    text-align: center;
    padding: 80px 0 60px;
}
.hero h1 { font-size: 42px; margin-bottom: 12px; }
.hero h1 span { color: var(--accent); }
.hero p { color: var(--text-muted); font-size: 18px; max-width: 600px; margin: 0 auto 32px; }

/* Compact hero (landing page) */
.hero-compact {
    text-align: center;
    padding: 28px 0 16px;
}
.hero-compact h1 { font-size: 32px; margin-bottom: 4px; }
.hero-compact h1 span { color: var(--accent); }
.hero-sub { color: var(--text-muted); font-size: 15px; margin: 0 auto 14px; }
.try-examples {
    margin-top: 10px;
    font-size: 13px;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    flex-wrap: wrap;
}
.try-examples button {
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--accent);
    font-size: 12px;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: 4px;
    cursor: pointer;
    transition: border-color 0.15s, background 0.15s;
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
}
.try-examples button:hover {
    border-color: var(--accent);
    background: rgba(88,166,255,0.08);
}

/* Cards grid */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 20px; padding-bottom: 60px; }
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 24px;
    transition: border-color 0.2s;
}
.card:hover { border-color: var(--accent); }
.card h3 { margin-bottom: 8px; font-size: 18px; }
.card p { color: var(--text-muted); font-size: 14px; }

/* Forms */
.form-section {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 24px;
    margin: 24px 0;
}
.form-row { display: flex; gap: 12px; flex-wrap: wrap; align-items: end; }
.form-group { display: flex; flex-direction: column; gap: 4px; flex: 1; min-width: 200px; }
.form-group label { font-size: 13px; font-weight: 600; color: var(--text-muted); }
.form-group input, .form-group select {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 8px 12px;
    color: var(--text);
    font-size: 14px;
}
.form-group input:focus { outline: none; border-color: var(--accent); }
button.primary {
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 6px;
    padding: 8px 20px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
    align-self: end;
}
button.primary:hover { background: var(--accent-hover); }
button.primary:disabled { opacity: 0.5; cursor: not-allowed; }

/* Tables */
.table-wrap { overflow-x: auto; margin: 20px 0; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th {
    text-align: left;
    padding: 10px 12px;
    background: var(--surface);
    border-bottom: 2px solid var(--border);
    font-weight: 600;
    color: var(--text-muted);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    cursor: pointer;
}
th:hover { color: var(--text); }
td {
    padding: 8px 12px;
    border-bottom: 1px solid var(--border);
}
tr:hover td { background: rgba(88, 166, 255, 0.04); }

/* Rank badge */
.rank-badge {
    display: inline-block;
    background: var(--accent);
    color: #fff;
    font-size: 12px;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 12px;
    min-width: 28px;
    text-align: center;
}

/* Score bar */
.score-bar {
    height: 6px;
    background: var(--border);
    border-radius: 3px;
    overflow: hidden;
    min-width: 80px;
}
.score-bar .fill {
    height: 100%;
    border-radius: 3px;
    background: var(--accent);
    transition: width 0.4s ease;
}

/* Status */
.status { padding: 20px; text-align: center; color: var(--text-muted); font-size: 14px; }
.status.error { color: var(--red); }
.spinner {
    display: inline-block;
    width: 20px; height: 20px;
    border: 2px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    margin-right: 8px;
    vertical-align: middle;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Stats row */
.stats-row { display: flex; gap: 16px; margin: 16px 0; flex-wrap: wrap; }
.stat-box {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px 20px;
    flex: 1;
    min-width: 140px;
}
.stat-box .label { font-size: 12px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px; }
.stat-box .value { font-size: 24px; font-weight: 700; color: var(--accent); margin-top: 4px; }

/* Graph container (vis-network) */
#graph-container {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    margin: 0;
    height: 600px;
    position: relative;
    overflow: hidden;
}
#graph-container .vis-network { outline: none; }
#graph-container .vis-navigation .vis-button {
    background-color: var(--surface) !important;
    border: 1px solid var(--border) !important;
    border-radius: 4px !important;
}
/* vis tooltip styling */
div.vis-tooltip {
    background: var(--surface) !important;
    border: 1px solid var(--border) !important;
    color: var(--text) !important;
    border-radius: 6px !important;
    padding: 8px 12px !important;
    font-size: 13px !important;
    font-family: inherit !important;
    white-space: pre-line !important;
    box-shadow: 0 4px 12px rgba(0,0,0,0.3) !important;
}

/* Highlight row */
tr.highlight td { background: rgba(63, 185, 80, 0.08); }
tr.highlight td:first-child .rank-badge { background: var(--green); }

/* URL input row */
.url-input-row {
    display: flex;
    gap: 10px;
    max-width: 560px;
    margin: 0 auto;
}
.url-input-row input {
    flex: 1;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 10px 14px;
    color: var(--text);
    font-size: 14px;
}
.url-input-row input:focus { outline: none; border-color: var(--accent); }
.url-input-row button { padding: 10px 24px; font-size: 14px; border-radius: 8px; }

/* Loading section */
.loading-section {
    text-align: center;
    padding: 40px 0;
}
.spinner-lg {
    display: inline-block;
    width: 40px; height: 40px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
    margin-bottom: 16px;
}
.loading-text { color: var(--text-muted); font-size: 16px; margin-bottom: 20px; }
.progress-track {
    max-width: 400px;
    margin: 0 auto;
    height: 4px;
    background: var(--border);
    border-radius: 2px;
    overflow: hidden;
}
.progress-fill {
    height: 100%;
    background: var(--accent);
    border-radius: 2px;
    width: 0;
    transition: width 0.5s ease;
}

/* Tabs */
.section-tabs {
    display: flex;
    gap: 4px;
    border-bottom: 1px solid var(--border);
    margin: 24px 0 0;
}
.tab {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 14px;
    font-weight: 600;
    padding: 10px 16px;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: color 0.2s, border-color 0.2s;
}
.tab:hover { color: var(--text); }
.tab.active { color: var(--accent); border-bottom-color: var(--accent); }

.tab-panel { display: none; padding-top: 8px; }
.tab-panel.active { display: block; }

/* Hotspot rows */
.hotspot-row td { background: rgba(210, 153, 34, 0.06); }
.hotspot-row:hover td { background: rgba(210, 153, 34, 0.1); }
.hotspot-badge {
    display: inline-block;
    background: var(--orange);
    color: #fff;
    font-size: 12px;
    font-weight: 700;
    padding: 2px 10px;
    border-radius: 12px;
}

/* Repo info card */
.repo-info-card { margin: 24px 0 0; }

/* Download button */
.download-btn {
    padding: 12px 32px;
    font-size: 16px;
    border-radius: 8px;
}

/* Modal overlay */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
}
.modal {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 32px;
    width: 100%;
    max-width: 440px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}
.modal h2 { margin-bottom: 0; font-size: 20px; }
.modal-field { margin-bottom: 16px; }
.modal-field label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 4px;
}
.modal-field input {
    width: 100%;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 10px 12px;
    color: var(--text);
    font-size: 14px;
}
.modal-field input:focus { outline: none; border-color: var(--accent); }
.modal-divider {
    text-align: center;
    margin: 12px 0;
    position: relative;
    color: var(--text-muted);
    font-size: 13px;
}
.modal-divider::before,
.modal-divider::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 40%;
    height: 1px;
    background: var(--border);
}
.modal-divider::before { left: 0; }
.modal-divider::after { right: 0; }
.modal-divider span { background: var(--surface); padding: 0 12px; position: relative; }
.modal-error {
    color: var(--red);
    font-size: 13px;
    margin-bottom: 12px;
}
.modal-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    margin-top: 20px;
}
.modal-cancel {
    background: none;
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 8px 16px;
    color: var(--text-muted);
    font-size: 14px;
    cursor: pointer;
}
.modal-cancel:hover { color: var(--text); border-color: var(--text-muted); }

/* Nav CTA buttons (top-right, always visible) */
.nav-cta {
    display: flex;
    gap: 8px;
    align-items: center;
    margin-left: auto;
}
.nav-cta-btn {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 6px 14px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 700;
    text-decoration: none !important;
    white-space: nowrap;
    transition: opacity 0.15s;
}
.nav-cta-btn:hover { opacity: 0.85; text-decoration: none !important; }
.nav-cta-github { background: #238636; color: #fff !important; }
.nav-cta-medium { background: #fff; color: #000 !important; }
.nav-cta-substack { background: #FF6719; color: #fff !important; }

@media (max-width: 600px) {
    .nav-cta-btn span { display: none; }
    .nav-cta-btn { padding: 6px 8px; }
}

/* Pipeline boxes */
.pipeline-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 10px;
    justify-content: center;
}
.pipe-card {
    background: var(--surface);
    border: 2px solid var(--border);
    border-radius: 10px;
    padding: 16px 14px;
    font-size: 12px;
    line-height: 1.5;
    color: var(--text-muted);
    text-align: center;
    transition: border-color 0.2s, box-shadow 0.2s;
    flex: 1 1 170px;
    max-width: 220px;
    min-width: 160px;
    box-shadow: 0 1px 4px rgba(0,0,0,0.2);
}
.pipe-card:hover {
    border-color: var(--accent);
    box-shadow: 0 2px 10px rgba(88,166,255,0.15);
}
.pipe-card strong { color: var(--text); font-size: 13px; display: block; margin: 6px 0 4px; }
.pipe-num {
    width: 28px; height: 28px;
    background: var(--accent);
    color: #fff;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 13px;
}

/* AST tree */
.ast-tree {
    max-height: 600px;
    overflow-y: auto;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px 16px;
    font-size: 13px;
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
}
.ast-node {
    padding: 3px 0;
    cursor: pointer;
    list-style: none;
    display: flex;
    align-items: center;
    gap: 6px;
}
.ast-node:hover { color: var(--accent); }
.ast-icon { font-size: 14px; flex-shrink: 0; }
.ast-count {
    margin-left: auto;
    font-size: 11px;
    color: var(--text-muted);
    background: var(--bg);
    padding: 1px 8px;
    border-radius: 8px;
}
.ast-dir-name { color: var(--text); font-weight: 600; }
.ast-file-name { color: var(--accent); }
.ast-children { padding-left: 20px; border-left: 1px solid var(--border); margin-left: 10px; }
.ast-symbols { padding-left: 16px; }
.ast-symbol {
    padding: 1px 0;
    color: var(--text-muted);
    font-size: 12px;
    display: flex;
    align-items: center;
    gap: 4px;
}
.ast-sym-icon { color: var(--orange); font-size: 8px; }
.ast-sym-name { color: var(--green); }
.ast-sym-line { color: var(--text-muted); font-size: 11px; }
details > summary { list-style: none; }
details > summary::-webkit-details-marker { display: none; }
details > summary::before {
    content: '\25B6';
    font-size: 10px;
    margin-right: 4px;
    color: var(--text-muted);
    transition: transform 0.2s;
    display: inline-block;
}
details[open] > summary::before { transform: rotate(90deg); }

/* Prioritization matrix */
.quadrant-legend {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-bottom: 16px;
}
.q-item {
    padding: 10px 14px;
    border-radius: 6px;
    font-size: 13px;
    line-height: 1.5;
    color: var(--text-muted);
    border: 1px solid var(--border);
}
.q-item strong { display: block; margin-bottom: 2px; }
.q-danger { background: rgba(248, 81, 73, 0.08); }
.q-danger strong { color: #f85149; }
.q-warning { background: rgba(210, 153, 34, 0.08); }
.q-warning strong { color: #d29922; }
.q-stable { background: rgba(88, 166, 255, 0.08); }
.q-stable strong { color: #58a6ff; }
.q-safe { background: rgba(63, 185, 80, 0.08); }
.q-safe strong { color: #3fb950; }

#matrix-viz {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px;
}

/* Author inline */
.author-inline {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px 16px;
    margin-bottom: 10px;
}
.author-inline p {
    color: var(--text-muted);
    font-size: 12px;
    line-height: 1.6;
    margin-bottom: 6px;
}
.author-meta { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.author-meta strong { font-size: 13px; color: var(--text); }
.author-links { display: flex; gap: 10px; }
.author-links a {
    font-size: 12px;
    font-weight: 500;
    color: var(--accent);
    text-decoration: none;
}
.author-links a:hover { text-decoration: underline; }

/* Footer */
footer {
    border-top: 1px solid var(--border);
    padding: 24px 0;
    color: var(--text-muted);
    font-size: 13px;
    margin-top: 40px;
}
.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}
.footer-brand span { color: var(--accent); }
.footer-author { text-align: right; }
.footer-author strong { color: var(--text); }
.footer-links { margin-left: 8px; }
.footer-links a {
    color: var(--text-muted);
    font-size: 12px;
    margin-left: 10px;
}
.footer-links a:hover { color: var(--accent); }