/* Marginalia — ink, brass and paper */

:root {
  --ink: #10121c;
  --ink-2: #171a2b;
  --ink-3: #20243a;
  --ink-border: #2b3049;
  --ink-border-2: #3a405e;
  --paper: #f4ecdd;
  --paper-dim: #e9dfc9;
  --paper-line: #d8ccb2;
  --paper-ink: #241e13;
  --paper-muted: #6b5f48;
  --brass: #d9a441;
  --brass-bright: #f0c065;
  --brass-deep: #9a6d1c;
  --ember: #e0714f;
  --sage: #7fbf8f;
  --slate: #a3aec8;
  --slate-dim: #6d7896;
  --serif: "Fraunces", Georgia, serif;
  --sans: "IBM Plex Sans", -apple-system, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Consolas, monospace;
  --sidebar-w: 276px;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--ink);
  background-image:
    radial-gradient(ellipse 900px 500px at 15% -10%, rgba(217, 164, 65, 0.1), transparent),
    radial-gradient(ellipse 700px 500px at 100% 10%, rgba(217, 164, 65, 0.05), transparent);
  color: var(--slate);
  font: 15px/1.55 var(--sans);
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
}
button, textarea, input { font: inherit; color: inherit; }
[hidden] { display: none !important; }
:focus-visible { outline: 2px solid var(--brass-bright); outline-offset: 2px; }
::selection { background: rgba(217, 164, 65, 0.35); color: var(--paper); }

#constellation {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--brass);
}
.eyebrow::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--brass);
  box-shadow: 0 0 10px 2px rgba(217, 164, 65, 0.6);
}
.eyebrow-dim { color: var(--slate-dim); letter-spacing: 0.08em; }

@keyframes rise {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: none; }
}

/* ---------- Layout ---------- */

.app {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  height: 100dvh;
}
.sidebar {
  display: flex;
  flex-direction: column;
  min-height: 0;
  background: rgba(13, 15, 24, 0.86);
  backdrop-filter: blur(8px);
  border-right: 1px solid var(--ink-border);
}
.main { display: flex; flex-direction: column; min-width: 0; min-height: 0; }

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  height: 38px;
  padding: 0 18px;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.2s ease, transform 0.15s ease;
}
.btn-brass { background: var(--brass); color: var(--ink); }
.btn-brass:hover { background: var(--brass-bright); transform: translateY(-1px); }
.btn-brass:active { transform: none; }
.btn-block { width: 100%; }

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: none;
  border-radius: 6px;
  background: transparent;
  color: var(--slate-dim);
  cursor: pointer;
}
.icon-btn:hover { background: var(--ink-3); color: var(--paper); }

/* ---------- Sidebar ---------- */

.sidebar-top { display: grid; gap: 20px; padding: 22px 16px 16px; }
.brand { display: flex; align-items: center; gap: 10px; padding: 0 4px; }
.brand-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--brass);
  box-shadow: 0 0 12px 3px rgba(217, 164, 65, 0.55);
}
.brand-name {
  font-family: var(--serif);
  font-size: 23px;
  font-weight: 560;
  color: var(--paper);
  letter-spacing: -0.01em;
}

.sidebar-label {
  padding: 12px 20px 8px;
  font-family: var(--serif);
  font-style: italic;
  font-size: 15px;
  color: var(--brass-bright);
}

.chat-list { list-style: none; margin: 0; padding: 0 10px; overflow-y: auto; flex: 1; min-height: 0; }
.chat-list:empty::after {
  content: "No saved threads yet. Start a chat and it'll appear here.";
  display: block;
  padding: 4px 10px;
  font-family: var(--serif);
  font-style: italic;
  font-size: 14px;
  line-height: 1.5;
  color: var(--slate-dim);
}

.chat-item {
  position: relative;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 10px;
  margin-bottom: 2px;
  border: 1px solid transparent;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.15s ease;
}
.chat-item:hover { background: var(--ink-3); }
.chat-item.active { background: rgba(217, 164, 65, 0.08); border-color: rgba(217, 164, 65, 0.3); }
.ci-text { flex: 1; min-width: 0; }
.ci-title { font-size: 13.5px; color: var(--slate); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.chat-item.active .ci-title { color: var(--paper); }
.ci-sub { font-family: var(--mono); font-size: 10.5px; color: var(--slate-dim); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; margin-top: 1px; }
.ci-time { flex-shrink: 0; font-family: var(--mono); font-size: 10px; color: var(--slate-dim); }
.ci-del { width: 24px; height: 24px; flex-shrink: 0; display: none; }
.chat-item:hover .ci-time, .chat-item:focus-within .ci-time { display: none; }
.chat-item:hover .ci-del, .chat-item:focus-within .ci-del { display: inline-flex; }
.ci-del:hover { color: var(--ember); background: transparent; }

.sidebar-foot {
  display: flex;
  gap: 8px;
  align-items: flex-start;
  padding: 14px 20px 16px;
  border-top: 1px solid var(--ink-border);
  font-size: 12px;
  line-height: 1.45;
  color: var(--slate-dim);
}
.sidebar-foot svg { flex-shrink: 0; margin-top: 2px; }

/* ---------- Top bar ---------- */

.topbar {
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: 62px;
  padding: 10px 28px;
  border-bottom: 1px solid var(--ink-border);
  background: rgba(16, 18, 28, 0.55);
  backdrop-filter: blur(6px);
  flex-shrink: 0;
}
.menu-btn { display: none; margin-left: -6px; }
.chat-title {
  margin: 0;
  min-width: 0;
  flex: 0 1 auto;
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 560;
  color: var(--paper);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.doc-chips { display: flex; gap: 6px; flex-wrap: nowrap; overflow-x: auto; margin-left: auto; scrollbar-width: none; }
.doc-chips::-webkit-scrollbar { display: none; }
.doc-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 26px;
  padding: 0 10px;
  border: 1px solid var(--ink-border);
  border-radius: 999px;
  background: var(--ink-2);
  color: var(--slate);
  font-size: 12px;
  white-space: nowrap;
}
.doc-chip svg { color: var(--brass); }
.dc-name { max-width: 180px; overflow: hidden; text-overflow: ellipsis; }
.dc-meta { font-family: var(--mono); font-size: 10.5px; color: var(--slate-dim); }

/* ---------- Hero (new chat) ---------- */

.hero { flex: 1; overflow-y: auto; display: flex; align-items: center; padding: 40px 28px; }
.hero-inner { width: 100%; max-width: 700px; margin: 0 auto; }
.hero-inner > * { opacity: 0; animation: rise 0.7s ease-out forwards; }
.hero-inner > :nth-child(2) { animation-delay: 0.1s; }
.hero-inner > :nth-child(3) { animation-delay: 0.2s; }
.hero-inner > :nth-child(4) { animation-delay: 0.3s; }
.hero-inner > :nth-child(5) { animation-delay: 0.4s; }

.wordmark {
  margin: 0 0 14px;
  font-family: var(--serif);
  font-optical-sizing: auto;
  font-weight: 560;
  font-size: clamp(2.5rem, 5.4vw, 3.6rem);
  line-height: 1.02;
  letter-spacing: -0.01em;
  color: var(--paper);
}
.wordmark em { font-style: italic; font-weight: 500; color: var(--brass-bright); }
.lede { margin: 0 0 32px; max-width: 50ch; font-size: 1.02rem; line-height: 1.6; }

.dropzone {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 22px 22px 22px 24px;
  border: 1.5px dashed var(--ink-border-2);
  border-radius: 14px;
  background: rgba(23, 26, 43, 0.88);
  backdrop-filter: blur(6px);
  cursor: pointer;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}
.dropzone:hover {
  border-color: var(--brass);
  box-shadow: 0 0 0 1px rgba(217, 164, 65, 0.2), 0 0 34px rgba(217, 164, 65, 0.12) inset;
}
.dz-sheet {
  position: relative;
  flex-shrink: 0;
  width: 46px;
  height: 56px;
  border-radius: 4px;
  background: var(--paper);
  color: var(--brass-deep);
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  clip-path: polygon(0 0, 72% 0, 100% 22%, 100% 100%, 0 100%);
}
.dz-sheet::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 28%;
  height: 22%;
  background: var(--paper-line);
  clip-path: polygon(0 0, 0 100%, 100% 100%);
}
.dz-text { flex: 1; display: grid; gap: 3px; pointer-events: none; }
.dz-text strong { font-family: var(--serif); font-size: 18px; font-weight: 560; color: var(--paper); }
.dz-text span { font-size: 13px; color: var(--slate-dim); }

.how {
  list-style: none;
  margin: 32px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--ink-border);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.how li { display: grid; gap: 4px; font-size: 13.5px; line-height: 1.5; }
.how-n { font-family: var(--serif); font-style: italic; font-size: 15px; color: var(--brass); }
.how strong { font-family: var(--serif); font-weight: 560; font-size: 17px; color: var(--paper); }

/* ---------- Indexing ---------- */

.indexing { flex: 1; display: flex; align-items: center; justify-content: center; padding: 24px; }
.index-card {
  width: 100%;
  max-width: 460px;
  padding: 20px 22px;
  border: 1px solid var(--ink-border);
  border-radius: 14px;
  background: rgba(23, 26, 43, 0.9);
  backdrop-filter: blur(6px);
}
.thread .index-card { max-width: none; }
.ic-head { display: flex; align-items: baseline; gap: 10px; margin-bottom: 14px; min-width: 0; }
.ic-label { font-family: var(--mono); font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--brass); }
.ic-name { font-family: var(--serif); font-size: 17px; color: var(--paper); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.progress { height: 4px; border-radius: 2px; background: var(--ink-3); overflow: hidden; }
.progress-bar {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--brass), var(--brass-bright));
  box-shadow: 0 0 12px rgba(240, 192, 101, 0.6);
  transition: width 0.25s ease;
}
.ic-step { margin-top: 10px; font-family: var(--mono); font-size: 12px; color: var(--slate-dim); }

/* ---------- Thread ---------- */

.thread { flex: 1; overflow-y: auto; min-height: 0; scroll-behavior: smooth; }
.thread-inner {
  max-width: 760px;
  margin: 0 auto;
  padding: 34px 28px 20px;
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.intro { padding: 6vh 0 4px; animation: rise 0.6s ease-out; }
.intro h2 {
  margin: 14px 0 8px;
  font-family: var(--serif);
  font-size: clamp(1.9rem, 3.6vw, 2.5rem);
  font-weight: 560;
  line-height: 1.1;
  color: var(--paper);
}
.intro h2 em { font-style: italic; font-weight: 500; color: var(--brass-bright); }
.intro p { margin: 0 0 24px; max-width: 58ch; }
.suggestions { display: grid; gap: 8px; }
.suggestion {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 13px 16px;
  border: 1px solid var(--ink-border);
  border-radius: 10px;
  background: rgba(23, 26, 43, 0.85);
  text-align: left;
  font-family: var(--serif);
  font-size: 16.5px;
  color: var(--paper);
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}
.suggestion svg { color: var(--slate-dim); transition: transform 0.2s, color 0.2s; }
.suggestion:hover { border-color: rgba(217, 164, 65, 0.5); background: rgba(217, 164, 65, 0.06); }
.suggestion:hover svg { color: var(--brass-bright); transform: translateX(3px); }

.msg-user {
  align-self: flex-end;
  max-width: 82%;
  padding: 10px 15px;
  border: 1px solid var(--ink-border);
  border-radius: 12px 12px 3px 12px;
  background: var(--ink-3);
  color: var(--paper);
  font-size: 15px;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  animation: rise 0.35s ease-out;
}

.msg-assistant {
  position: relative;
  align-self: stretch;
  padding: 18px 20px 14px;
  border-left: 3px solid var(--brass);
  border-radius: 3px 12px 12px 12px;
  background: var(--paper);
  color: var(--paper-ink);
  box-shadow: 0 10px 30px -14px rgba(0, 0, 0, 0.6);
  animation: rise 0.4s ease-out;
}
.answer { font-family: var(--serif); font-size: 16.5px; line-height: 1.62; overflow-wrap: anywhere; }
.answer p { margin: 0 0 11px; }
.answer p:last-child { margin-bottom: 0; }
.answer ul, .answer ol { margin: 0 0 11px; padding-left: 22px; }
.answer li { margin: 4px 0; }
.answer li::marker { color: var(--brass-deep); }
.answer strong { font-weight: 680; }
.answer code { font-family: var(--mono); font-size: 0.82em; background: var(--paper-dim); padding: 1px 5px; border-radius: 4px; }

.msg-assistant.pending { background: rgba(244, 236, 221, 0.92); }
.thinking { display: inline-flex; gap: 4px; margin-right: 10px; vertical-align: middle; }
.thinking i { width: 6px; height: 6px; border-radius: 50%; background: var(--brass-deep); animation: pulse 1.2s infinite ease-in-out; }
.thinking i:nth-child(2) { animation-delay: 0.15s; }
.thinking i:nth-child(3) { animation-delay: 0.3s; }
@keyframes pulse { 0%, 80%, 100% { opacity: 0.25; } 40% { opacity: 1; } }
.thinking-label { font-style: italic; color: var(--paper-muted); }

.msg-assistant.error { background: #2a1a1a; border-left-color: var(--ember); color: #f3c2b4; }
.msg-assistant.error .answer { font-family: var(--sans); font-size: 14.5px; }
.retry-btn {
  margin-top: 10px;
  height: 28px;
  padding: 0 12px;
  border: 1px solid rgba(243, 194, 180, 0.4);
  border-radius: 999px;
  background: none;
  font-size: 12.5px;
  cursor: pointer;
}

.cite {
  display: inline-block;
  min-width: 17px;
  padding: 0 4px;
  margin: 0 1px;
  border: 1px solid rgba(154, 109, 28, 0.35);
  border-radius: 4px;
  background: #f7e3b8;
  color: #6e4c0f;
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 500;
  line-height: 15px;
  vertical-align: super;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.cite:hover { background: var(--brass); color: var(--ink); }

.peek {
  position: absolute;
  z-index: 10;
  width: min(360px, 100%);
  padding: 12px 14px;
  border: 1px solid var(--ink-border-2);
  border-radius: 10px;
  background: var(--ink-2);
  box-shadow: 0 14px 34px -10px rgba(0, 0, 0, 0.7);
  pointer-events: none;
}
.peek-head { margin-bottom: 6px; font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--brass); }
.peek-body { font-size: 13px; line-height: 1.5; color: var(--slate); }

.msg-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--paper-line);
}
.copy-btn {
  height: 28px;
  margin-left: auto;
  padding: 0 10px;
  border: 1px solid transparent;
  border-radius: 999px;
  background: none;
  font-size: 12.5px;
  color: var(--paper-muted);
  cursor: pointer;
}
.copy-btn:hover { border-color: var(--paper-line); color: var(--paper-ink); }

/* Sources: hidden until asked for */
.sources { display: contents; }
.sources-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 28px;
  padding: 0 10px 0 12px;
  border: 1px solid var(--paper-line);
  border-radius: 999px;
  background: var(--paper-dim);
  font-size: 12.5px;
  font-weight: 500;
  color: var(--paper-ink);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}
.sources-toggle:hover { border-color: var(--brass-deep); }
.st-pages { font-family: var(--mono); font-size: 11px; color: var(--paper-muted); }
.st-pages:empty { display: none; }
.st-chev { transition: transform 0.2s; }
.sources.open .sources-toggle { background: #f7e3b8; border-color: rgba(154, 109, 28, 0.45); }
.sources.open .st-chev { transform: rotate(180deg); }

.sources-list {
  order: 10;
  flex-basis: 100%;
  margin-top: 4px;
  border: 1px solid var(--paper-line);
  border-radius: 8px;
  background: #fbf6ec;
  overflow: hidden;
  animation: rise 0.25s ease-out;
}
.source + .source { border-top: 1px solid var(--paper-line); }
.source summary { display: flex; gap: 10px; align-items: baseline; padding: 9px 12px; cursor: pointer; list-style: none; font-size: 13px; }
.source summary::-webkit-details-marker { display: none; }
.source summary:hover { background: var(--paper-dim); }
.src-n {
  flex-shrink: 0;
  min-width: 18px;
  padding: 0 4px;
  border-radius: 4px;
  background: #f7e3b8;
  color: #6e4c0f;
  font-family: var(--mono);
  font-size: 10.5px;
  line-height: 16px;
  text-align: center;
}
.src-page { flex-shrink: 0; max-width: 45%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-family: var(--mono); font-size: 11.5px; color: var(--paper-ink); }
.src-snippet { flex: 1; min-width: 0; color: var(--paper-muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.source[open] .src-snippet { visibility: hidden; }
.src-body {
  padding: 0 14px 14px 40px;
  font-family: var(--serif);
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--paper-muted);
  white-space: pre-wrap;
  max-height: 280px;
  overflow-y: auto;
}
.source.flash summary { background: #f7e3b8; }

/* ---------- Composer ---------- */

.composer { flex-shrink: 0; padding: 10px 28px 18px; }
.composer-box {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  align-items: flex-end;
  gap: 8px;
  padding: 8px;
  border: 1px solid var(--ink-border-2);
  border-radius: 14px;
  background: rgba(23, 26, 43, 0.94);
  backdrop-filter: blur(6px);
  box-shadow: 0 14px 34px -16px rgba(0, 0, 0, 0.7);
  transition: border-color 0.2s, box-shadow 0.2s;
}
.composer-box:focus-within { border-color: var(--brass); box-shadow: 0 0 0 1px rgba(217, 164, 65, 0.2), 0 14px 34px -16px rgba(0, 0, 0, 0.7); }
.composer textarea {
  flex: 1;
  border: none;
  outline: none;
  resize: none;
  background: transparent;
  padding: 8px 4px;
  max-height: 180px;
  font-size: 15px;
  line-height: 1.45;
  color: var(--paper);
}
.composer textarea::placeholder { color: var(--slate-dim); }
.attach-btn, .send-btn {
  flex-shrink: 0;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}
.attach-btn { border: 1px solid var(--ink-border); background: var(--ink-3); color: var(--slate); }
.attach-btn:hover:not(:disabled) { border-color: var(--brass); color: var(--brass-bright); }
.send-btn { border: none; background: var(--brass); color: var(--ink); }
.send-btn:hover:not(:disabled) { background: var(--brass-bright); }
.attach-btn:disabled, .send-btn:disabled { opacity: 0.45; cursor: not-allowed; }
.composer-hint { max-width: 760px; margin: 8px auto 0; font-family: var(--mono); font-size: 11px; color: var(--slate-dim); text-align: center; }
kbd { font-family: var(--mono); font-size: 10.5px; padding: 0 4px; border: 1px solid var(--ink-border-2); border-bottom-width: 2px; border-radius: 4px; color: var(--slate); }

/* ---------- Overlays ---------- */

.drop-overlay {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(16, 18, 28, 0.82);
  pointer-events: none;
}
.drop-overlay div {
  padding: 22px 30px;
  border: 1.5px dashed var(--brass);
  border-radius: 14px;
  background: var(--ink-2);
  box-shadow: 0 0 40px rgba(217, 164, 65, 0.2);
  font-family: var(--serif);
  font-size: 20px;
  color: var(--brass-bright);
}

.toast {
  position: fixed;
  left: 50%;
  top: 74px;
  transform: translateX(-50%);
  z-index: 60;
  max-width: calc(100vw - 32px);
  padding: 10px 16px;
  border: 1px solid var(--ink-border-2);
  border-radius: 10px;
  background: var(--ink-2);
  color: var(--paper);
  font-size: 13.5px;
  box-shadow: 0 12px 30px -10px rgba(0, 0, 0, 0.7);
}
.toast.error { border-color: rgba(224, 113, 79, 0.6); color: #f3c2b4; }

.scrim { display: none; }

/* ---------- Scrollbars ---------- */

.thread, .chat-list, .hero, .src-body { scrollbar-width: thin; scrollbar-color: var(--ink-border-2) transparent; }
.thread::-webkit-scrollbar, .chat-list::-webkit-scrollbar { width: 8px; }
.thread::-webkit-scrollbar-thumb, .chat-list::-webkit-scrollbar-thumb { background: var(--ink-border); border-radius: 4px; }

/* ---------- Mobile ---------- */

@media (max-width: 860px) {
  .app { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: min(var(--sidebar-w), 86vw);
    z-index: 40;
    background: rgba(13, 15, 24, 0.97);
    transform: translateX(-100%);
    transition: transform 0.22s ease;
  }
  .app.nav-open .sidebar { transform: none; box-shadow: 0 0 40px rgba(0, 0, 0, 0.6); }
  .app.nav-open .scrim { display: block; position: fixed; inset: 0; z-index: 30; background: rgba(0, 0, 0, 0.45); }
  .menu-btn { display: inline-flex; }
  .topbar { padding: 8px 14px 8px 16px; flex-wrap: wrap; min-height: 56px; gap: 8px 10px; }
  .chat-title { font-size: 17px; flex: 1; }
  .doc-chips { margin-left: 0; flex-basis: 100%; }
  .hero { padding: 28px 16px; align-items: flex-start; }
  .dropzone { flex-wrap: wrap; }
  .dropzone .btn { width: 100%; }
  .how { grid-template-columns: 1fr; gap: 16px; }
  .thread-inner { padding: 22px 14px 10px; }
  .msg-assistant { padding: 15px 15px 12px; }
  .answer { font-size: 16px; }
  .composer { padding: 6px 10px 10px; }
  .composer-hint { display: none; }
  .msg-user { max-width: 92%; }
  .ci-del { display: inline-flex; }
  .ci-time { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
  .hero-inner > * { opacity: 1; }
}