/* ════════════════════════════════════════════════════════════
   UNVEIL Code Browser
   Two-pane GitHub-style viewer for the anonymous submission.
═══════════════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Source+Sans+3:wght@400;600;700&family=JetBrains+Mono:wght@400;600&display=swap');

:root {
  --cb-primary: #2c3e6b;
  --cb-accent: #e74c3c;
  --cb-bg: #ffffff;
  --cb-bg-alt: #f6f8fa;
  --cb-bg-tree: #fbfcfd;
  --cb-border: #d8dee4;
  --cb-border-soft: #eaedf1;
  --cb-text: #24292f;
  --cb-text-muted: #57606a;
  --cb-text-faint: #8b949e;
  --cb-hover: #f0f3f6;
  --cb-selected: #ddebf7;
  --cb-selected-border: #2c3e6b;
  --cb-link: #2c3e6b;
  --cb-code-bg: #ffffff;
  --cb-lineno-bg: #f6f8fa;
  --cb-lineno-fg: #8b949e;

  --cb-header-h: 52px;
  --cb-tree-w: 300px;
  --cb-mono: 'JetBrains Mono', 'SF Mono', 'Consolas', 'Liberation Mono', 'Menlo', monospace;
  --cb-sans: 'Source Sans 3', system-ui, -apple-system, 'Segoe UI', sans-serif;
}

* { box-sizing: border-box; }

/* Author-CSS display rules (e.g. .cb-code-wrap{display:flex}) outrank the
   user-agent [hidden]{display:none}; force the attribute to win. */
[hidden] { display: none !important; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  font-family: var(--cb-sans);
  color: var(--cb-text);
  background: var(--cb-bg);
  font-size: 14px;
  line-height: 1.55;
  display: flex;
  flex-direction: column;
}

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

/* ── Header strip ─────────────────────────────────────────── */
.cb-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 1rem;
  height: var(--cb-header-h);
  padding: 0 1rem;
  background: #000;
  color: #fff;
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
}

.cb-back {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: #fff;
  font-weight: 600;
  font-size: 0.92rem;
  padding: 0.3rem 0.65rem;
  border-radius: 6px;
  border: 1px solid rgba(255, 255, 255, 0.25);
  transition: background 0.15s;
}
.cb-back:hover {
  background: rgba(255, 255, 255, 0.12);
  text-decoration: none;
}

.cb-breadcrumb {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--cb-mono);
  font-size: 0.9rem;
  color: #e0e6f0;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}
.cb-crumb {
  color: #e0e6f0;
}
.cb-crumb-root {
  font-family: var(--cb-sans);
  font-weight: 700;
  letter-spacing: 0.04em;
  color: #fff;
}
.cb-crumb-active {
  color: #fff;
  font-weight: 600;
}
.cb-crumb-sep {
  color: rgba(255, 255, 255, 0.45);
}

.cb-download {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: #fff;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.3);
  padding: 0.35rem 0.75rem;
  border-radius: 6px;
  font-size: 0.88rem;
  font-weight: 600;
  transition: background 0.15s;
}
.cb-download:hover {
  background: rgba(255, 255, 255, 0.22);
  text-decoration: none;
}

/* ── Main two-pane layout ─────────────────────────────────── */
.cb-main {
  flex: 1;
  display: grid;
  grid-template-columns: var(--cb-tree-w) 1fr;
  min-height: 0;
  overflow: hidden;
}

/* ── Left: file tree pane ─────────────────────────────────── */
.cb-tree-pane {
  background: var(--cb-bg-tree);
  border-right: 1px solid var(--cb-border);
  overflow-y: auto;
  overflow-x: hidden;
}

.cb-tree-header {
  position: sticky;
  top: 0;
  background: var(--cb-bg-tree);
  border-bottom: 1px solid var(--cb-border-soft);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.55rem 0.85rem;
  z-index: 2;
}
.cb-tree-title {
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--cb-text-muted);
}
.cb-tree-collapse {
  background: transparent;
  border: none;
  color: var(--cb-text-faint);
  padding: 4px;
  cursor: pointer;
  border-radius: 4px;
  display: flex;
  align-items: center;
}
.cb-tree-collapse:hover {
  background: var(--cb-hover);
  color: var(--cb-text);
}

.cb-tree {
  padding: 0.4rem 0;
  font-size: 0.92rem;
}

/* ── Search bar (above tree) ─────────────────────────────── */
.cb-search-wrap {
  position: sticky;
  top: 0;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 0.75rem;
  background: var(--cb-bg-tree);
  border-bottom: 1px solid var(--cb-border-soft);
}
.cb-search-icon {
  flex: 0 0 13px;
  color: var(--cb-text-faint);
}
.cb-search-input {
  flex: 1;
  min-width: 0;
  border: 1px solid var(--cb-border);
  border-radius: 6px;
  padding: 0.32rem 0.55rem;
  font-family: var(--cb-sans);
  font-size: 0.85rem;
  color: var(--cb-text);
  background: #fff;
  outline: none;
  transition: border-color 0.12s, box-shadow 0.12s;
}
.cb-search-input:focus {
  border-color: var(--cb-primary);
  box-shadow: 0 0 0 2px rgba(44, 62, 107, 0.12);
}
.cb-search-input::-webkit-search-cancel-button { display: none; }
.cb-search-clear {
  background: transparent;
  border: none;
  color: var(--cb-text-faint);
  cursor: pointer;
  padding: 3px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.cb-search-clear:hover { background: var(--cb-hover); color: var(--cb-text); }

.cb-search-status {
  padding: 0.4rem 0.85rem;
  font-size: 0.78rem;
  color: var(--cb-text-faint);
  border-bottom: 1px solid var(--cb-border-soft);
  font-family: var(--cb-mono);
}

.cb-search-results {
  padding: 0.3rem 0;
  font-size: 0.88rem;
}
.cb-search-result {
  display: flex;
  flex-direction: column;
  gap: 1px;
  padding: 0.32rem 0.75rem;
  cursor: pointer;
  border-left: 2px solid transparent;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.cb-search-result:hover {
  background: var(--cb-hover);
}
.cb-search-result.cb-selected {
  background: var(--cb-selected);
  border-left-color: var(--cb-selected-border);
}
.cb-search-result-name {
  font-family: var(--cb-mono);
  font-size: 0.84rem;
  color: var(--cb-text);
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
}
.cb-search-result-dir {
  font-family: var(--cb-mono);
  font-size: 0.72rem;
  color: var(--cb-text-faint);
  overflow: hidden;
  text-overflow: ellipsis;
}
.cb-search-result-name mark,
.cb-search-result-dir mark {
  background: #fff3b8;
  color: inherit;
  padding: 0;
  border-radius: 2px;
}

.cb-tree-loading {
  padding: 1rem;
  color: var(--cb-text-faint);
  font-style: italic;
  font-size: 0.9rem;
}

.cb-node {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.18rem 0.5rem 0.18rem 0;
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  user-select: none;
  border-left: 2px solid transparent;
  color: var(--cb-text);
}
.cb-node:hover {
  background: var(--cb-hover);
}
.cb-node.cb-file.cb-selected {
  background: var(--cb-selected);
  border-left-color: var(--cb-selected-border);
  font-weight: 600;
}

.cb-node-icon {
  flex: 0 0 14px;
  width: 14px;
  height: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--cb-text-faint);
}
.cb-node-chevron {
  flex: 0 0 12px;
  width: 12px;
  height: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--cb-text-faint);
  transition: transform 0.12s ease-out;
}
.cb-node.cb-dir.cb-open > .cb-node-chevron {
  transform: rotate(90deg);
}

.cb-node-name {
  font-size: 0.9rem;
  overflow: hidden;
  text-overflow: ellipsis;
}
.cb-node.cb-dir > .cb-node-name {
  font-weight: 600;
  color: var(--cb-text);
}

.cb-children {
  display: none;
}
.cb-children.cb-open {
  display: block;
}

/* ── Right: viewer pane ──────────────────────────────────── */
.cb-viewer-pane {
  display: flex;
  flex-direction: column;
  min-height: 0;
  min-width: 0;            /* let inner overflow:auto kick in for wide CSV tables */
  background: var(--cb-bg);
}

.cb-viewer-header {
  position: sticky;
  top: 0;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.55rem 1rem;
  background: var(--cb-bg-alt);
  border-bottom: 1px solid var(--cb-border);
}
.cb-viewer-filename {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--cb-mono);
  font-size: 0.88rem;
  color: var(--cb-text);
  min-width: 0;
  overflow: hidden;
}
.cb-file-icon {
  width: 14px;
  height: 14px;
  flex: 0 0 14px;
  display: inline-flex;
  color: var(--cb-text-faint);
}
.cb-file-name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-weight: 600;
}
.cb-lang-badge {
  font-family: var(--cb-sans);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--cb-text-muted);
  background: #fff;
  border: 1px solid var(--cb-border);
  padding: 0.1rem 0.4rem;
  border-radius: 999px;
}
.cb-lang-badge:empty {
  display: none;
}
.cb-file-size {
  font-family: var(--cb-sans);
  font-size: 0.78rem;
  color: var(--cb-text-faint);
}

.cb-viewer-actions {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.cb-action {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  background: #fff;
  border: 1px solid var(--cb-border);
  color: var(--cb-text-muted);
  padding: 0.3rem 0.6rem;
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: 6px;
  cursor: pointer;
  font-family: var(--cb-sans);
  transition: background 0.12s, color 0.12s, border-color 0.12s;
}
.cb-action:hover {
  background: var(--cb-hover);
  color: var(--cb-text);
}
.cb-action.cb-action-success {
  color: #1a7f37;
  border-color: #b6e2c2;
  background: #f0fbf2;
}

.cb-viewer-body {
  flex: 1;
  overflow: auto;
  min-width: 0;            /* same fix at this level */
  background: var(--cb-bg);
}

.cb-empty-state {
  padding: 3rem 2rem;
  color: var(--cb-text-faint);
  text-align: center;
  font-size: 0.95rem;
}
.cb-empty-state .cb-empty-sub {
  margin-top: 0.6rem;
  font-size: 0.82rem;
  color: var(--cb-text-faint);
}
.cb-empty-state .cb-empty-sub a {
  color: var(--cb-link);
}

/* ── Code viewer with line numbers ───────────────────────── */
.cb-code-wrap {
  display: flex;
  align-items: stretch;
  font-family: var(--cb-mono);
  font-size: 13px;
  line-height: 1.55;
  background: var(--cb-code-bg);
  min-height: 100%;
}

.cb-line-numbers {
  flex: 0 0 auto;
  margin: 0;
  padding: 1rem 0.75rem 1rem 1rem;
  background: var(--cb-lineno-bg);
  color: var(--cb-lineno-fg);
  text-align: right;
  user-select: none;
  border-right: 1px solid var(--cb-border-soft);
  font-family: var(--cb-mono);
  font-size: 13px;
  line-height: 1.55;
  white-space: pre;
  min-width: 3.5rem;
}

.cb-code {
  flex: 1;
  margin: 0;
  padding: 1rem 1rem 1rem 1rem;
  background: var(--cb-code-bg);
  overflow-x: auto;
  font-family: var(--cb-mono);
  font-size: 13px;
  line-height: 1.55;
  white-space: pre;
  tab-size: 4;
}
.cb-code code {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  white-space: pre;
  background: transparent !important;
  padding: 0 !important;
}

/* ── CSV table viewer ────────────────────────────────────── */
.cb-csv-view {
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100%;
  min-width: 0;
  min-height: 0;
  background: var(--cb-bg);
}
.cb-csv-scroll {
  flex: 1;
  min-width: 0;
  min-height: 0;
  overflow: auto;          /* both axes scroll inside this container */
  background: var(--cb-bg);
}
.cb-csv-table {
  border-collapse: separate;
  border-spacing: 0;
  font-family: var(--cb-mono);
  font-size: 12px;
  line-height: 1.45;
  width: max-content;
  background: var(--cb-bg);
}
.cb-csv-table thead th {
  position: sticky;
  top: 0;
  z-index: 3;
  background: var(--cb-bg-alt);
  color: var(--cb-text);
  font-weight: 700;
  text-align: right;
  padding: 0.4rem 0.7rem;
  border-right: 1px solid var(--cb-border-soft);
  border-bottom: 2px solid var(--cb-border);
  white-space: nowrap;
  font-family: var(--cb-mono);
  font-size: 11px;
  letter-spacing: 0.01em;
}
.cb-csv-table thead th:first-child,
.cb-csv-table tbody td:first-child {
  position: sticky;
  left: 0;
  z-index: 2;
  background: var(--cb-bg-alt);
  color: var(--cb-text-muted);
  text-align: right;
  font-weight: 600;
  border-right: 2px solid var(--cb-border);
  min-width: 60px;
}
.cb-csv-table thead th:first-child {
  z-index: 4;
}
.cb-csv-table tbody td {
  padding: 0.28rem 0.7rem;
  text-align: right;
  border-right: 1px solid var(--cb-border-soft);
  border-bottom: 1px solid var(--cb-border-soft);
  white-space: nowrap;
  color: var(--cb-text);
}
.cb-csv-table tbody tr:nth-child(even) td {
  background: #fafbfc;
}
.cb-csv-table tbody tr:nth-child(even) td:first-child {
  background: #f0f2f5;
}
.cb-csv-table tbody tr:hover td {
  background: var(--cb-selected);
}
.cb-csv-table tbody tr:hover td:first-child {
  background: var(--cb-selected);
}
.cb-csv-empty {
  padding: 2rem 1.5rem;
  color: var(--cb-text-faint);
  text-align: center;
  font-style: italic;
}
.cb-csv-truncated {
  padding: 0.6rem 1rem;
  background: #fff8e1;
  border-top: 1px solid #f1d774;
  color: #715a00;
  font-family: var(--cb-sans);
  font-size: 0.82rem;
  text-align: center;
  position: sticky;
  bottom: 0;
}

/* ── Directory listing view ──────────────────────────────── */
.cb-dir-view {
  padding: 0;
}
.cb-dir-list {
  border: none;
  border-radius: 0;
  overflow: hidden;
  background: var(--cb-bg);
  width: 100%;
}
.cb-dir-row {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.55rem 1rem;
  border-bottom: 1px solid var(--cb-border-soft);
  cursor: pointer;
  background: var(--cb-bg);
  transition: background 0.1s;
  color: var(--cb-text);
  text-decoration: none;
  font-size: 0.94rem;
}
.cb-dir-row:last-child {
  border-bottom: none;
}
.cb-dir-row:hover {
  background: var(--cb-hover);
}
.cb-dir-row:hover .cb-dir-row-name {
  color: var(--cb-link);
  text-decoration: underline;
}
.cb-dir-row-icon {
  flex: 0 0 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--cb-text-faint);
}
.cb-dir-row-icon.cb-dir-icon-folder {
  color: #54aeff;
}
.cb-dir-row-name {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-weight: 500;
}
.cb-dir-row.cb-dir-row-folder .cb-dir-row-name {
  font-weight: 600;
}
.cb-dir-row-size {
  flex: 0 0 auto;
  font-family: var(--cb-mono);
  font-size: 0.78rem;
  color: var(--cb-text-faint);
}
.cb-dir-row-up {
  background: var(--cb-bg-alt);
}
.cb-dir-empty {
  padding: 1.5rem;
  text-align: center;
  color: var(--cb-text-faint);
  font-style: italic;
}

/* Sidebar — selected directory (matches selected file styling) */
.cb-node.cb-dir.cb-selected {
  background: var(--cb-selected);
  border-left-color: var(--cb-selected-border);
}

/* Clickable breadcrumb segments */
.cb-breadcrumb .cb-crumb.cb-crumb-link {
  cursor: pointer;
}
.cb-breadcrumb .cb-crumb.cb-crumb-link:hover {
  color: #fff;
  text-decoration: underline;
}

/* ── Markdown rendering ──────────────────────────────────── */
.cb-markdown {
  max-width: 900px;
  margin: 0 auto;
  padding: 2.5rem 2rem 4rem;
  font-size: 15px;
  line-height: 1.75;
  color: var(--cb-text);
}
.cb-markdown h1, .cb-markdown h2 {
  border-bottom: 1px solid var(--cb-border-soft);
  padding-bottom: 0.3em;
  margin-top: 1.8em;
  margin-bottom: 0.6em;
  font-family: var(--cb-sans);
  font-weight: 700;
  color: var(--cb-primary);
}
.cb-markdown h1 { font-size: 1.8rem; margin-top: 0; }
.cb-markdown h2 { font-size: 1.4rem; }
.cb-markdown h3 { font-size: 1.15rem; margin-top: 1.4em; color: var(--cb-primary); }
.cb-markdown h4 { font-size: 1rem; color: var(--cb-primary); }
.cb-markdown p { margin: 0.6em 0 1em; }
.cb-markdown a { color: var(--cb-accent); }
.cb-markdown a:hover { text-decoration: underline; }
.cb-markdown ul, .cb-markdown ol { margin: 0.4em 0 1em; padding-left: 1.8em; }
.cb-markdown li { margin: 0.2em 0; }
.cb-markdown code {
  font-family: var(--cb-mono);
  font-size: 0.88em;
  background: var(--cb-bg-alt);
  padding: 0.1em 0.35em;
  border-radius: 4px;
  color: var(--cb-primary);
}
.cb-markdown pre {
  background: var(--cb-bg-alt);
  border: 1px solid var(--cb-border-soft);
  border-radius: 6px;
  padding: 0.85rem 1rem;
  overflow-x: auto;
  font-size: 0.88em;
  line-height: 1.55;
}
.cb-markdown pre code {
  background: transparent;
  padding: 0;
  color: inherit;
  font-size: inherit;
}
.cb-markdown blockquote {
  margin: 0.8em 0;
  padding: 0.4em 1em;
  border-left: 3px solid var(--cb-primary);
  background: var(--cb-bg-alt);
  color: var(--cb-text-muted);
}
.cb-markdown table {
  border-collapse: collapse;
  margin: 1em 0;
  font-size: 0.92em;
}
.cb-markdown th, .cb-markdown td {
  border: 1px solid var(--cb-border);
  padding: 0.4em 0.7em;
}
.cb-markdown th {
  background: var(--cb-bg-alt);
  font-weight: 600;
}
.cb-markdown hr {
  border: none;
  border-top: 1px solid var(--cb-border-soft);
  margin: 1.5em 0;
}

/* ── Responsive: mobile collapse to single column ────────── */
@media (max-width: 820px) {
  .cb-main {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr;
  }
  .cb-tree-pane {
    border-right: none;
    border-bottom: 1px solid var(--cb-border);
    max-height: 40vh;
  }
  .cb-back span,
  .cb-download span {
    display: none;
  }
  .cb-back,
  .cb-download {
    padding: 0.35rem 0.55rem;
  }
  .cb-action-label {
    display: none;
  }
  .cb-action {
    padding: 0.3rem 0.45rem;
  }
  .cb-file-size {
    display: none;
  }
  .cb-markdown {
    padding: 1.5rem 1rem 3rem;
  }
}

@media (max-width: 480px) {
  .cb-tree-pane {
    max-height: 35vh;
  }
  .cb-header {
    padding: 0 0.6rem;
    gap: 0.5rem;
  }
  .cb-lang-badge {
    display: none;
  }
}