:root {
  --bg:        #0a0a0a;
  --bg-soft:   #111111;
  --bg-bar:    #1a1a1a;
  --bg-input:  #161616;
  --bg-code:   #0d1117;
  --fg:        #e4e4e7;
  --fg-muted:  #71717a;
  --accent:    #4ade80;  /* prompt green */
  --accent-2:  #22d3ee;  /* command cyan */
  --ok:        #84cc16;
  --err:       #ef4444;
  --border:    #262626;
  --font-mono: ui-monospace, "JetBrains Mono", "Fira Code", "SF Mono", Menlo, Consolas, monospace;
}

*,
*::before,
*::after { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body {
  background-image:
    radial-gradient(ellipse at top, rgba(74, 222, 128, 0.04), transparent 50%),
    radial-gradient(ellipse at bottom, rgba(34, 211, 238, 0.03), transparent 50%);
  min-height: 100vh;
  padding: 2rem 1rem 4rem;
}

.terminal {
  max-width: 920px;
  margin: 0 auto;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  background: var(--bg-soft);
  box-shadow:
    0 0 80px rgba(74, 222, 128, 0.04),
    0 20px 60px rgba(0, 0, 0, 0.5);
}

/* ---------- title bar ---------- */

.bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: var(--bg-bar);
  border-bottom: 1px solid var(--border);
  user-select: none;
}
.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  flex-shrink: 0;
}
.dot.red    { background: #ff5f56; }
.dot.yellow { background: #ffbd2e; }
.dot.green  { background: #27c93f; }
.bar .title {
  margin-left: 0.5rem;
  color: var(--fg-muted);
  font-size: 12px;
  letter-spacing: 0.04em;
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.bar .search {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--fg);
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 0.3rem 0.6rem;
  width: 180px;
  outline: none;
  transition: border-color 0.15s, width 0.15s;
}
.bar .search:focus {
  border-color: var(--accent);
  width: 220px;
}
.bar .search::placeholder { color: var(--fg-muted); }

/* ---------- screen ---------- */

.screen {
  padding: 1.75rem;
}

.boot {
  color: var(--accent);
  font-size: 9.5px;
  line-height: 1.1;
  margin: 0 0 0.6rem;
  white-space: pre;
  overflow-x: auto;
  text-shadow: 0 0 12px rgba(74, 222, 128, 0.25);
}
.boot-line {
  margin: 0 0 1.25rem;
  font-size: 11px;
  letter-spacing: 0.05em;
}

.divider {
  border: none;
  border-top: 1px dashed var(--border);
  margin: 1.25rem 0;
}

/* ---------- input row ---------- */

.input-row {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
}
.input-row textarea {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--fg);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.6;
  outline: none;
  resize: none;
  padding: 0;
  overflow-y: auto;
  caret-color: var(--accent);
  min-height: 1.6em;
}
.input-row textarea::placeholder { color: var(--fg-muted); }

.hint {
  margin: 0.5rem 0 0.25rem 0;
  color: var(--fg-muted);
  font-size: 11px;
  letter-spacing: 0.03em;
}

/* ---------- semantic colors ---------- */

.prompt { color: var(--accent); }
.sep    { color: var(--fg-muted); }
.muted  { color: var(--fg-muted); }
.error  { color: var(--err); }

/* ---------- Q&A entries ---------- */

#active.entry {
  margin-top: 1.25rem;
  padding-top: 0;
  border-top: none;
}
#archive .entry:first-child {
  border-top: none;
  padding-top: 0;
}

.entry {
  margin: 1.25rem 0;
  padding-top: 1.25rem;
  border-top: 1px dashed var(--border);
}
.entry.hidden { display: none; }

.entry .qline {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  margin-bottom: 0.6rem;
}
.entry .qtext {
  color: var(--fg);
  flex: 1;
  word-break: break-word;
  white-space: pre-wrap;
}
.entry .answer {
  color: var(--fg);
  white-space: pre-wrap;
  word-break: break-word;
  margin: 0.4rem 0 0.6rem 0;
  opacity: 0.95;
  min-height: 1.6em;
}
.entry .answer.streaming::after {
  content: "▌";
  display: inline-block;
  color: var(--accent);
  animation: blink 1.05s steps(1) infinite;
  margin-left: 2px;
}
.entry .answer.error {
  color: var(--err);
  opacity: 0.85;
}
.entry .meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  font-size: 11px;
  color: var(--fg-muted);
  margin-top: 0.5rem;
}
.entry .meta .tags {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}
.entry .meta .tag {
  color: var(--accent-2);
  cursor: pointer;
  transition: opacity 0.1s;
}
.entry .meta .tag:hover { opacity: 0.7; }
.entry .meta .time { color: var(--fg-muted); }

.empty {
  padding: 0.5rem 0;
  font-style: italic;
}

/* ---------- markdown rendering inside .answer.rendered ---------- */

.entry .answer.rendered {
  white-space: normal;
}
.entry .answer.rendered > *:first-child { margin-top: 0; }
.entry .answer.rendered > *:last-child  { margin-bottom: 0; }

.entry .answer.rendered h1,
.entry .answer.rendered h2,
.entry .answer.rendered h3,
.entry .answer.rendered h4,
.entry .answer.rendered h5,
.entry .answer.rendered h6 {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent);
  margin: 1.2em 0 0.5em;
  letter-spacing: 0.02em;
  line-height: 1.3;
}
.entry .answer.rendered h1 { font-size: 17px; }
.entry .answer.rendered h2 { font-size: 15px; }
.entry .answer.rendered h3 { font-size: 14px; }
.entry .answer.rendered h4 { font-size: 13px; color: var(--accent-2); }
.entry .answer.rendered h5,
.entry .answer.rendered h6 { font-size: 12.5px; color: var(--accent-2); }

.entry .answer.rendered h1::before { content: "# ";    opacity: 0.45; }
.entry .answer.rendered h2::before { content: "## ";   opacity: 0.45; }
.entry .answer.rendered h3::before { content: "### ";  opacity: 0.45; }
.entry .answer.rendered h4::before { content: "#### "; opacity: 0.45; }

.entry .answer.rendered p {
  margin: 0.6em 0;
}
.entry .answer.rendered ul,
.entry .answer.rendered ol {
  margin: 0.5em 0;
  padding-left: 1.6em;
}
.entry .answer.rendered ul { list-style: none; }
.entry .answer.rendered ul > li::before {
  content: "›";
  color: var(--accent);
  display: inline-block;
  width: 1em;
  margin-left: -1em;
}
.entry .answer.rendered li {
  margin: 0.25em 0;
}
.entry .answer.rendered strong {
  color: var(--fg);
  font-weight: 700;
}
.entry .answer.rendered em {
  color: var(--accent-2);
  font-style: italic;
}
.entry .answer.rendered del {
  color: var(--fg-muted);
}

/* inline code */
.entry .answer.rendered code {
  background: rgba(74, 222, 128, 0.10);
  color: var(--accent);
  padding: 0.1em 0.4em;
  border-radius: 3px;
  font-size: 0.92em;
  font-family: var(--font-mono);
}

/* fenced code block */
.entry .answer.rendered pre {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.85em 1em;
  margin: 0.9em 0;
  overflow-x: auto;
  font-size: 12.5px;
  line-height: 1.55;
}
.entry .answer.rendered pre code,
.entry .answer.rendered pre code.hljs {
  background: transparent;
  color: var(--fg);
  padding: 0;
  border-radius: 0;
  font-size: inherit;
  display: block;
}

.entry .answer.rendered blockquote {
  border-left: 2px solid var(--accent);
  padding-left: 1em;
  margin: 0.9em 0;
  color: var(--fg-muted);
  font-style: italic;
}

.entry .answer.rendered table {
  border-collapse: collapse;
  margin: 0.9em 0;
  font-size: 12.5px;
  width: 100%;
  display: block;
  overflow-x: auto;
}
.entry .answer.rendered th,
.entry .answer.rendered td {
  border: 1px solid var(--border);
  padding: 0.45em 0.75em;
  text-align: left;
  vertical-align: top;
}
.entry .answer.rendered th {
  background: var(--bg-bar);
  color: var(--accent);
  font-weight: 700;
}

.entry .answer.rendered hr {
  border: none;
  border-top: 1px dashed var(--border);
  margin: 1.2em 0;
}

.entry .answer.rendered a {
  color: var(--accent-2);
  text-decoration: underline;
  text-decoration-color: rgba(34, 211, 238, 0.4);
}
.entry .answer.rendered a:hover {
  text-decoration-color: var(--accent-2);
}

/* KaTeX overrides for dark theme */
.entry .answer.rendered .katex {
  font-size: 1em;
  color: var(--fg);
}
.entry .answer.rendered .katex-display {
  margin: 0.9em 0;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0.2em 0;
}

@keyframes blink {
  50% { opacity: 0; }
}

/* ---------- mobile ---------- */

@media (max-width: 720px) {
  body { padding: 1rem 0.5rem 3rem; }
  .terminal { margin: 0; }
  .screen { padding: 1.25rem 1rem 1.5rem; }
  .boot { font-size: 7px; }
  .bar .title { display: none; }
  .bar .search { width: 100%; }
  .bar .search:focus { width: 100%; }
}