/* ─────────────────────────────────────────────────────────────
   DocuChat AI — style.css (black theme)
   Design concept carried over from the light "manuscript" version,
   flipped to a dark, near-black surface with a warm amber accent —
   citations and structural text (page numbers, status, footer)
   still use the monospace face, echoing footnote typography, now
   glowing softly against black instead of sitting on paper.
   ───────────────────────────────────────────────────────────── */

:root {
  --bg: #0a0a0c;
  --surface: #131316;
  --surface-raised: #18181c;
  --line: #262629;
  --ink: #eceae5;
  --ink-soft: #9a9a9f;
  --ink-faint: #5c5c62;
  --accent: #d9a441;       /* warm amber — citations & primary actions */
  --accent-soft: #2a2419;
  --accent-strong: #f0b955;
  --warn: #e07a5f;
  --success: #4caf7d;

  --font-display: "Source Serif 4", Georgia, serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;
  --font-body: "Source Serif 4", Georgia, serif;
}

* { box-sizing: border-box; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.6;
}

/* ── Header ─────────────────────────────────────────────────── */
.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
}

.brand-logo {
  height: 30px;
  width: auto;
  display: block;
}

.brand-divider {
  color: var(--line);
  font-weight: 300;
}

.brand-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: 0.01em;
  color: var(--ink);
}

.badge-live {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-soft);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--success);
  display: inline-block;
  box-shadow: 0 0 6px var(--success);
}

/* ── Hero ───────────────────────────────────────────────────── */
.hero {
  padding: 3.5rem 0 2.5rem;
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.hero h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.1;
  max-width: 14ch;
  color: var(--ink);
}

.lead-text {
  max-width: 52ch;
  color: var(--ink-soft);
  font-size: 1.15rem;
  margin-top: 1rem;
}

/* ── Workspace / panels ─────────────────────────────────────── */
.workspace { padding: 2.5rem 0 3rem; }

.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1.5rem;
}

.panel-title {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
  margin-bottom: 1rem;
}

.pipeline-list {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--ink-soft);
  padding-left: 1.1rem;
  margin: 0;
}
.pipeline-list li { margin-bottom: 0.5rem; }
.pipeline-list li::marker { color: var(--accent); }

/* ── Upload zone ────────────────────────────────────────────── */
.upload-zone {
  border: 1.5px dashed var(--line);
  border-radius: 8px;
  padding: 2rem 1rem;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
}
.upload-zone:hover,
.upload-zone.drag-over {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.upload-icon { font-size: 1.6rem; margin: 0 0 0.3rem; color: var(--accent); }
.upload-text { margin: 0; font-size: 0.95rem; color: var(--ink); }
.upload-link { color: var(--accent); text-decoration: underline; }
.upload-hint {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--ink-faint);
  margin: 0.4rem 0 0;
}

.btn-outline-doc {
  border: 1px solid var(--line);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  background: transparent;
}
.btn-outline-doc:hover { border-color: var(--accent); color: var(--accent); }

.upload-status {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  margin-top: 0.9rem;
  padding: 0.6rem 0.75rem;
  border-radius: 4px;
  background: var(--accent-soft);
  color: var(--accent-strong);
}
.upload-status.is-error {
  background: rgba(224, 122, 95, 0.12);
  color: var(--warn);
}

.document-info {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}
.document-name { font-weight: 600; margin-bottom: 0.15rem; color: var(--ink); }
.document-meta {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--ink-soft);
}

/* ── Chat panel ─────────────────────────────────────────────── */
.chat-panel { display: flex; flex-direction: column; height: 100%; min-height: 560px; }

.chat-panel-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.queries-remaining {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-soft);
}

.chat-log {
  flex: 1;
  overflow-y: auto;
  padding-right: 0.25rem;
  margin-bottom: 1rem;
}

.chat-empty {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-faint);
  font-style: italic;
  text-align: center;
  padding: 2rem;
}

.msg { margin-bottom: 1.25rem; max-width: 85%; }
.msg-user { margin-left: auto; }
.msg-bubble {
  padding: 0.75rem 1rem;
  border-radius: 8px;
  line-height: 1.55;
}
.msg-user .msg-bubble {
  background: var(--accent);
  color: #16130a;
  border-bottom-right-radius: 2px;
}
.msg-assistant .msg-bubble {
  background: var(--surface-raised);
  border: 1px solid var(--line);
  color: var(--ink);
  border-bottom-left-radius: 2px;
}

.citations {
  margin-top: 0.6rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.citation-chip {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  background: var(--surface);
  border: 1px solid var(--line);
  color: var(--accent-strong);
  border-radius: 4px;
  padding: 0.25rem 0.5rem;
  cursor: default;
}
.citation-chip .page-label { font-weight: 600; }
.citation-quote {
  display: block;
  color: var(--ink-soft);
  font-style: italic;
  margin-top: 0.15rem;
  max-width: 34ch;
  white-space: normal;
}

.chat-form {
  display: flex;
  gap: 0.6rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--line);
}
.chat-input {
  font-family: var(--font-body);
  font-size: 1rem;
  background: var(--surface-raised);
  border: 1px solid var(--line);
  color: var(--ink);
}
.chat-input::placeholder { color: var(--ink-faint); }
.chat-input:focus {
  background: var(--surface-raised);
  border-color: var(--accent);
  color: var(--ink);
  box-shadow: 0 0 0 0.2rem var(--accent-soft);
}
.chat-input:disabled { background: var(--surface); }

.btn-doc-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #16130a;
  font-weight: 600;
}
.btn-doc-primary:hover { background: var(--accent-strong); border-color: var(--accent-strong); color: #16130a; }
.btn-doc-primary:disabled { background: #3a3a3f; border-color: #3a3a3f; color: var(--ink-faint); }

.typing-indicator {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--ink-soft);
}

/* ── Footer ─────────────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 1.75rem 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-faint);
  text-align: center;
}

.footer-inner { display: flex; flex-direction: column; gap: 0.4rem; }

.footer-tagline { margin: 0; }

.footer-copyright { margin: 0; color: var(--ink-soft); }
.footer-copyright a {
  color: var(--accent);
  text-decoration: none;
}
.footer-copyright a:hover { text-decoration: underline; }

/* ── Accessibility: visible focus outlines everywhere ──────────── */
a:focus-visible, button:focus-visible, input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ── Reduced motion ─────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}