/* ═══════════════════════════════════════════════════════════════════
   PaperBrain — "NEWSPRINT"
   An ode to print journalism: stark geometry, zero radius, visible
   grid rules, typographic drama. Single light palette, no dark mode.

   NOTE ON APPROACH — the reference design system is expressed in
   Tailwind utilities. This project has no build step (see CLAUDE.md),
   so the same DNA is expressed as semantic vanilla CSS driven by
   central tokens. Same rules, same rhythm, no framework.
   ═══════════════════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400;0,600;0,700;0,900;1,400&family=Lora:ital,wght@0,400;0,600;1,400&family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

/* ── Tokens ─────────────────────────────────────────────────────── */
:root {
  --paper:      #F9F9F7;   /* newsprint off-white */
  --ink:        #111111;   /* ink black — text AND borders */
  --muted:      #E5E5E0;   /* divider grey */
  --accent:     #CC0000;   /* editorial red — used at ~1% of surface */

  --n100: #F5F5F5;
  --n200: #E5E5E5;
  --n300: #D4D4D4;
  --n400: #A3A3A3;
  --n500: #6B6B6B;   /* nudged darker: #737373 lands at exactly 4.50:1 */
  --n600: #525252;
  --n700: #404040;

  --display: 'Playfair Display', 'Times New Roman', serif;
  --body:    'Lora', Georgia, serif;
  --ui:      'Inter', 'Helvetica Neue', sans-serif;
  --mono:    'JetBrains Mono', 'Courier New', monospace;

  --rule:       1px solid var(--ink);
  --rule-heavy: 4px solid var(--ink);
  --rule-thin:  1px solid var(--muted);

  --snap: 200ms ease-out;

  /* legacy token aliases — keep older declarations honest */
  --text-primary:   var(--ink);
  --text-secondary: var(--n600);
  --text-tertiary:  var(--n500);
  --border-subtle:  var(--muted);
  --border-default: var(--ink);
  --success:        #0E7A53;
  --warning:        #926019;
  --danger:         var(--accent);
}

/* ── Reset — zero radius everywhere, no exceptions ──────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0; padding: 0;
  border-radius: 0;
}
html { background: var(--paper); min-height: 100%; }

body {
  background-color: var(--paper);
  /* 4x4 halftone dot grid */
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='4' height='4' viewBox='0 0 4 4'%3E%3Cpath fill='%23111111' fill-opacity='0.04' d='M1 3h1v1H1V3zm2-2h1v1H3V1z'%3E%3C/path%3E%3C/svg%3E");
  color: var(--ink);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.625;
  -webkit-font-smoothing: antialiased;
  /* Column layout so the colophon is pushed to the foot of short pages. */
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* The chat page is an app shell, not an article: it must fill the
   viewport exactly (not just min it) so .chat-layout's flex:1 has a
   definite size to divide up, and .messages can scroll internally
   instead of the whole document growing as replies stream in. */
body.app-shell {
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; }

::selection { background: var(--ink); color: var(--paper); }

:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 2px;
}

/* Fine graph-paper texture for major sections */
.newsprint-texture { position: relative; }
.newsprint-texture::before {
  content: '';
  position: absolute; inset: 0;
  background-image:
    linear-gradient(0deg,  transparent 98%, rgba(0,0,0,0.02) 100%),
    linear-gradient(90deg, transparent 98%, rgba(0,0,0,0.02) 100%);
  background-size: 3px 3px;
  pointer-events: none;
  opacity: 0.5;
}

/* ── Scrollbar ──────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 12px; height: 12px; }
::-webkit-scrollbar-track { background: var(--paper); border-left: var(--rule-thin); }
::-webkit-scrollbar-thumb { background: var(--ink); border: 3px solid var(--paper); }
::-webkit-scrollbar-thumb:hover { background: var(--n700); }

/* ── Typography ─────────────────────────────────────────────────── */
h1, h2, h3, h4 { font-family: var(--display); font-weight: 900; letter-spacing: -0.02em; }

.kicker, .label {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--n500);
  display: block;
}

.label-inline { display: inline; }
.rule       { height: 0; border: none; border-top: var(--rule); }
.rule-heavy { height: 0; border: none; border-top: var(--rule-heavy); }
.divider    { height: 0; border: none; border-top: var(--rule); }

.dropcap::first-letter {
  float: left;
  font-family: var(--display);
  font-weight: 900;
  font-size: 4.6em;
  line-height: 0.82;
  padding: 0.06em 0.09em 0 0;
  color: var(--ink);
}

.ornament {
  text-align: center;
  font-family: var(--display);
  font-size: 18px;
  color: var(--n400);
  letter-spacing: 1em;
  padding: 22px 0 22px 1em;
}

/* ── Masthead ───────────────────────────────────────────────────── */
.masthead {
  border-bottom: var(--rule-heavy);
  background: var(--paper);
  position: relative; z-index: 20;
}
.masthead-inner { max-width: 1280px; margin: 0 auto; padding: 0 20px; }
.masthead-brand { display: block; text-align: center; padding: 26px 0 14px; }
.masthead-title {
  font-family: var(--display);
  font-weight: 900;
  font-size: clamp(38px, 7vw, 76px);
  line-height: 0.9;
  letter-spacing: -0.035em;
  text-transform: uppercase;
}
.masthead-brand:hover .masthead-title { color: var(--accent); }
.masthead-sub {
  font-family: var(--mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.36em;
  color: var(--n500);
  margin-top: 10px;
}
.edition-line {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; flex-wrap: wrap;
  border-top: var(--rule);
  padding: 8px 0;
  font-family: var(--mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--n600);
}

/* ── Ticker (breaking-news crawl) ───────────────────────────────── */
.ticker {
  background: var(--ink);
  color: var(--paper);
  overflow: hidden;
  border-bottom: var(--rule);
  position: relative; z-index: 20;
}
.ticker-track {
  display: flex;
  gap: 44px;
  white-space: nowrap;
  padding: 9px 0;
  font-family: var(--mono);
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  width: max-content;
  animation: crawl 38s linear infinite;
}
.ticker:hover .ticker-track { animation-play-state: paused; }
.ticker-item { display: inline-flex; align-items: center; gap: 10px; }
.ticker-item::before { content: '\25A0'; color: var(--accent); font-size: 8px; }
@keyframes crawl {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}

/* ── Top nav (utility strip under the masthead) ─────────────────── */
.app-topnav {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px;
  min-height: 44px;
  /* Align inner content with the 1240px content column; rule stays full-bleed. */
  padding: 0 max(20px, calc((100% - 1240px) / 2));
  background: var(--paper);
  border-bottom: var(--rule);
  position: relative; z-index: 20;
}
.topnav-left, .topnav-right { display: flex; align-items: center; gap: 14px; min-width: 0; }
.topnav-brand { display: flex; align-items: center; gap: 10px; }
.topnav-brand:hover .logo-text { color: var(--accent); }
.topnav-back {
  font-family: var(--mono); font-size: 10.5px;
  text-transform: uppercase; letter-spacing: 0.14em;
  color: var(--ink); white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: border-color var(--snap), color var(--snap);
}
.topnav-back:hover { color: var(--accent); border-bottom-color: var(--accent); }
.topnav-sep { color: var(--n400); }
.topnav-title {
  font-family: var(--display); font-size: 17px; font-weight: 700;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  max-width: 360px;
}
.topnav-user {
  font-family: var(--mono); font-size: 10px;
  text-transform: uppercase; letter-spacing: 0.14em;
  color: var(--n600);
  border-left: var(--rule-thin); padding-left: 14px;
  white-space: nowrap; max-width: 180px;
  overflow: hidden; text-overflow: ellipsis;
}

/* ── Logo mark ──────────────────────────────────────────────────── */
.logo-row { display: flex; align-items: center; gap: 10px; }
.logo-mark {
  width: 26px; height: 26px;
  background: var(--ink); color: var(--paper);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--display); font-size: 17px; font-weight: 900;
  flex-shrink: 0;
  transition: background var(--snap), color var(--snap);
}
.logo-row:hover .logo-mark,
.topnav-brand:hover .logo-mark { background: var(--accent); }
.logo-text {
  font-family: var(--display); font-size: 19px; font-weight: 900;
  text-transform: uppercase; letter-spacing: -0.01em;
  transition: color var(--snap);
}

/* ── Buttons ────────────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 44px;
  padding: 11px 20px;
  font-family: var(--ui); font-size: 11px; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.16em;
  cursor: pointer;
  border: 1px solid var(--ink);
  background: var(--paper); color: var(--ink);
  white-space: nowrap;
  position: relative; overflow: hidden;
  transition: background var(--snap), color var(--snap),
              border-color var(--snap), box-shadow var(--snap), transform var(--snap);
}
.btn-primary { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.btn-primary:hover:not(:disabled) {
  background: var(--paper); color: var(--ink);
  box-shadow: 4px 4px 0 0 var(--ink);
  transform: translate(-2px, -2px);
}
.btn-primary:disabled {
  background: var(--n200); color: var(--n600);
  border-color: var(--n400); cursor: not-allowed;
}
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--ink); }
.btn-ghost:hover:not(:disabled) {
  background: var(--ink); color: var(--paper);
  box-shadow: 4px 4px 0 0 var(--n400);
  transform: translate(-2px, -2px);
}
.btn-danger { background: transparent; color: var(--accent); border-color: var(--accent); }
.btn-danger:hover { background: var(--accent); color: var(--paper); }
.btn:active:not(:disabled) { transform: translate(0, 0); box-shadow: none; }

.btn-icon {
  background: transparent; border: 1px solid transparent;
  color: var(--ink); cursor: pointer;
  min-width: 30px; min-height: 30px;
  display: inline-flex; align-items: center; justify-content: center;
  transition: background var(--snap), color var(--snap), border-color var(--snap);
}
.btn-icon:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); }

/* ── Inputs ─────────────────────────────────────────────────────── */
input, textarea {
  width: 100%;
  background: transparent;
  border: none;
  border-bottom: 2px solid var(--ink);
  color: var(--ink);
  font-family: var(--mono); font-size: 13px;
  padding: 11px 4px;
  min-height: 44px;
  outline: none;
  transition: background var(--snap);
}
input:focus, textarea:focus { background: #F0F0F0; outline: none; }
input::placeholder, textarea::placeholder {
  color: var(--n500); font-family: var(--mono);
  text-transform: uppercase; font-size: 11px; letter-spacing: 0.1em;
}

/* ── Badges ─────────────────────────────────────────────────────── */
.badge {
  font-family: var(--mono); font-size: 9px; font-weight: 500;
  text-transform: uppercase; letter-spacing: 0.14em;
  padding: 3px 7px;
  border: 1px solid var(--ink);
  display: inline-flex; align-items: center; gap: 4px;
  white-space: nowrap;
}
.badge-pdf      { background: var(--ink);    color: var(--paper); }
.badge-web      { background: transparent;   color: var(--ink); }
.badge-yt       { background: var(--accent); color: var(--paper); border-color: var(--accent); }
.badge-count    { color: var(--n600); border-color: var(--n400); }
.badge-fast     { color: var(--ink); }
.badge-balanced { color: var(--ink); }
.badge-powerful { background: var(--ink); color: var(--paper); }

/* ── Animations (fast, mechanical) ──────────────────────────────── */
@keyframes fadeIn      { from { opacity: 0; } to { opacity: 1; } }
@keyframes fadeInRight { from { opacity: 0; transform: translateX(10px); } to { opacity: 1; transform: none; } }
@keyframes fadeInLeft  { from { opacity: 0; transform: translateX(-10px); } to { opacity: 1; transform: none; } }
@keyframes popIn       { from { opacity: 0; transform: translateY(6px); }  to { opacity: 1; transform: none; } }
@keyframes riseIn      { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
@keyframes spin        { to { transform: rotate(360deg); } }
@keyframes pulse       { 0%, 80%, 100% { opacity: 0.2; } 40% { opacity: 1; } }
@keyframes blink       { 0%, 49% { opacity: 1; } 50%, 100% { opacity: 0; } }
@keyframes rippleAnim  { to { transform: scale(4); opacity: 0; } }

/* ═════════════════════════════════════════════════════════════════
   LOGIN + UPLOAD — shared editorial two-column shell
   ═════════════════════════════════════════════════════════════════ */
.auth-layout, .upload-layout {
  display: grid;
  grid-template-columns: 6fr 6fr;
  flex: 1;
  max-width: 1280px;
  margin: 0 auto;
  border-left: var(--rule);
  border-right: var(--rule);
  background: var(--paper);
  position: relative; z-index: 1;
}

.auth-sidebar, .upload-sidebar {
  border-right: var(--rule);
  display: flex; flex-direction: column;
  background: var(--paper);
}
.upload-sidebar-top { padding: 22px 26px; border-bottom: var(--rule); }
.upload-sidebar-content {
  padding: 30px 26px;
  display: flex; flex-direction: column; gap: 26px;
  flex: 1;
}
.upload-sidebar-content h1 {
  font-family: var(--display);
  font-size: clamp(34px, 4.6vw, 58px);
  font-weight: 900;
  line-height: 0.94;
  letter-spacing: -0.03em;
  animation: riseIn 0.35s ease-out both;
}
.upload-sidebar-content p {
  font-family: var(--body);
  font-size: 16px; line-height: 1.625;
  color: var(--n700);
  margin-top: 18px;
  text-align: justify;
  hyphens: auto;
}
.feature-list { list-style: none; border-top: var(--rule); }
.feature-list li {
  display: flex; align-items: flex-start; gap: 14px;
  padding: 14px 0;
  border-bottom: var(--rule-thin);
  font-family: var(--ui); font-size: 13px;
  color: var(--n700);
}
.feature-dot {
  width: 8px; height: 8px;
  background: var(--ink);
  flex-shrink: 0; margin-top: 7px;
  transition: background var(--snap), transform var(--snap);
}
.feature-list li:hover .feature-dot { background: var(--accent); transform: scale(1.5); }
.upload-sidebar-bottom {
  padding: 18px 26px; margin-top: auto;
  border-top: var(--rule);
  display: flex; flex-direction: column; gap: 4px;
}
.upload-sidebar-bottom span {
  font-family: var(--mono); font-size: 9.5px;
  text-transform: uppercase; letter-spacing: 0.14em;
  color: var(--n500);
}

.upload-main { padding: 34px 30px 48px; }
.upload-inner { max-width: 640px; }

/* ── Drop zone ──────────────────────────────────────────────────── */
.drop-zone {
  border: 2px solid var(--ink);
  min-height: 210px;
  display: flex; align-items: center; justify-content: center;
  flex-direction: column; gap: 12px;
  cursor: pointer; padding: 34px; text-align: center;
  position: relative; overflow: hidden;
  background:
    radial-gradient(var(--ink) 1px, transparent 1px) 0 0 / 16px 16px,
    var(--paper);
  transition: background-color var(--snap), box-shadow var(--snap), transform var(--snap);
}
.drop-zone::after {
  content: '';
  position: absolute; inset: 0;
  background: var(--paper);
  opacity: 0.94;
  pointer-events: none;
}
.drop-zone > * { position: relative; z-index: 1; }
.drop-zone:hover {
  box-shadow: 6px 6px 0 0 var(--ink);
  transform: translate(-3px, -3px);
}
.drop-zone.drag-over {
  background-color: var(--n100);
  box-shadow: 6px 6px 0 0 var(--accent);
  transform: translate(-3px, -3px);
}
.drop-zone.drag-over::after { opacity: 0.88; }
.drop-zone input[type="file"] {
  position: absolute; inset: 0; opacity: 0;
  width: 100%; height: 100%; cursor: pointer;
}
.drop-icon { color: var(--ink); }
.drop-title {
  font-family: var(--display); font-size: 30px; font-weight: 900;
  letter-spacing: -0.02em; line-height: 1;
}
.drop-sub {
  font-family: var(--mono); font-size: 10px;
  text-transform: uppercase; letter-spacing: 0.16em;
  color: var(--n600);
}

/* ── Or divider ─────────────────────────────────────────────────── */
.or-divider {
  display: flex; align-items: center; gap: 18px;
  margin: 26px 0;
  font-family: var(--mono); font-size: 9.5px;
  text-transform: uppercase; letter-spacing: 0.3em;
  color: var(--n500);
}
.or-divider::before, .or-divider::after {
  content: ''; flex: 1; height: 0; border-top: var(--rule);
}

.url-row { display: flex; gap: 0; border: var(--rule); }
.url-row input { border: none; padding: 14px 16px; flex: 1; }
.url-row .btn { border: none; border-left: var(--rule); flex-shrink: 0; }
.url-row .btn-primary:hover:not(:disabled) {
  box-shadow: none; transform: none;
  background: var(--accent); color: var(--paper);
}

/* ── Status bar ─────────────────────────────────────────────────── */
.status-bar {
  display: flex; align-items: center; gap: 12px;
  margin-top: 20px; padding: 13px 16px;
  border: var(--rule);
  border-left: 4px solid var(--ink);
  font-family: var(--mono); font-size: 11.5px;
  text-transform: uppercase; letter-spacing: 0.1em;
  animation: fadeIn 0.2s ease-out;
}
.status-bar.hidden { display: none; }
.status-bar.success { border-left-color: var(--ink); background: var(--n100); }
.status-bar.error   { border-left-color: var(--accent); color: var(--accent); }
.spinner { width: 16px; height: 16px; flex-shrink: 0; animation: spin 0.8s linear infinite; }

/* ── Docs ledger ────────────────────────────────────────────────── */
.docs-section { margin-top: 40px; }
.docs-section.hidden { display: none; }
.docs-header {
  display: flex; align-items: baseline; justify-content: space-between;
  padding-bottom: 8px;
  border-bottom: var(--rule-heavy);
}
.docs-count { font-family: var(--mono); font-size: 10px; color: var(--n600); letter-spacing: 0.14em; }
.doc-list { display: flex; flex-direction: column; }

.doc-row {
  display: flex; align-items: center; gap: 14px;
  padding: 14px 6px;
  border-bottom: var(--rule-thin);
  animation: popIn 0.2s ease-out both;
  transition: background var(--snap), padding-left var(--snap);
}
.doc-row:hover { background: var(--n100); padding-left: 14px; }
.doc-row:hover .doc-delete { opacity: 1; }
.doc-icon {
  flex-shrink: 0; color: var(--ink);
  width: 32px; height: 32px;
  border: var(--rule);
  display: flex; align-items: center; justify-content: center;
  transition: background var(--snap), color var(--snap);
}
.doc-row:hover .doc-icon { background: var(--ink); color: var(--paper); }
.doc-info { flex: 1; min-width: 0; }
.doc-name {
  font-family: var(--display); font-size: 16px; font-weight: 700;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.doc-meta { display: flex; align-items: center; gap: 10px; margin-top: 5px; }
.doc-chunks {
  font-family: var(--mono); font-size: 9.5px;
  text-transform: uppercase; letter-spacing: 0.12em; color: var(--n600);
}
.doc-delete { opacity: 0; flex-shrink: 0; transition: opacity var(--snap), background var(--snap), color var(--snap); }
.doc-delete:hover { background: var(--accent) !important; color: var(--paper) !important; border-color: var(--accent) !important; }

.upload-bottom-bar {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; margin-top: 34px; padding-top: 20px;
  border-top: var(--rule-heavy);
}
.upload-count {
  font-family: var(--mono); font-size: 10px;
  text-transform: uppercase; letter-spacing: 0.14em; color: var(--n600);
}

/* ═════════════════════════════════════════════════════════════════
   LOGIN — subscriber box
   ═════════════════════════════════════════════════════════════════ */
.auth-main { padding: 40px 30px; display: flex; align-items: center; justify-content: center; }
.auth-card {
  width: 100%; max-width: 440px;
  border: var(--rule);
  background: var(--paper);
  animation: popIn 0.28s ease-out both;
}
.auth-card-head { border-bottom: var(--rule); padding: 18px 24px; text-align: center; }
.auth-card-head h2 {
  font-family: var(--display); font-size: 27px; font-weight: 900;
  text-transform: uppercase; letter-spacing: -0.01em;
}
.auth-card-head .kicker { margin-top: 5px; }
.auth-card-body { padding: 24px; }

.auth-tabs { display: grid; grid-template-columns: 1fr 1fr; border-bottom: var(--rule); }
.auth-tab {
  background: transparent; border: none; cursor: pointer;
  padding: 13px 10px; min-height: 44px;
  font-family: var(--ui); font-size: 11px; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.16em;
  color: var(--n600);
  border-bottom: 3px solid transparent;
  transition: background var(--snap), color var(--snap), border-color var(--snap);
}
.auth-tab:first-child { border-right: var(--rule); }
.auth-tab:hover { background: var(--n100); color: var(--ink); }
.auth-tab.active { color: var(--ink); border-bottom-color: var(--ink); background: var(--paper); }

.auth-error {
  border: 1px solid var(--accent);
  border-left: 4px solid var(--accent);
  color: var(--accent);
  background: var(--paper);
  padding: 11px 14px;
  font-family: var(--mono); font-size: 11px;
  text-transform: uppercase; letter-spacing: 0.1em;
  margin-bottom: 18px;
  animation: fadeIn 0.2s ease;
}
.auth-error.hidden { display: none; }
.auth-form { display: flex; flex-direction: column; }
.auth-form.hidden { display: none; }
.auth-form .field-label {
  font-family: var(--mono); font-size: 9.5px; font-weight: 500;
  text-transform: uppercase; letter-spacing: 0.18em;
  color: var(--n600);
  margin-top: 20px; margin-bottom: 5px;
}
.auth-form .field-label:first-child { margin-top: 0; }
.auth-submit { margin-top: 28px; width: 100%; }

/* ═════════════════════════════════════════════════════════════════
   HOME — the front page
   ═════════════════════════════════════════════════════════════════ */
.home-layout { display: flex; flex-direction: column; min-height: 100vh; position: relative; z-index: 1; }
.home-main { flex: 1; }
.home-inner { max-width: 1280px; margin: 0 auto; padding: 0 20px 70px; }

.home-header {
  display: flex; align-items: flex-end; justify-content: space-between;
  gap: 24px; flex-wrap: wrap;
  padding: 40px 0 14px;
  border-bottom: var(--rule-heavy);
}
.home-header h1 {
  font-family: var(--display);
  font-size: clamp(44px, 8vw, 104px);
  font-weight: 900; line-height: 0.88;
  letter-spacing: -0.04em;
  text-transform: uppercase;
  animation: riseIn 0.35s ease-out both;
}
.home-header p {
  font-family: var(--body); font-size: 15px;
  color: var(--n600); margin-top: 14px; max-width: 46ch;
}
.home-header .btn-primary { flex-shrink: 0; }

/* Collapsed-border card grid */
.chat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  border-left: var(--rule);
  counter-reset: card-counter;
}
.chat-card {
  position: relative;
  border-right: var(--rule);
  border-bottom: var(--rule);
  background: transparent;
  padding: 22px 20px 20px;
  cursor: pointer;
  display: flex; flex-direction: column; gap: 12px;
  min-height: 190px;
  counter-increment: card-counter;
  animation: popIn 0.22s ease-out both;
  transition: background var(--snap), box-shadow var(--snap), transform var(--snap);
}
.chat-card::before {
  content: 'FIG. ' counter(card-counter);
  position: absolute; top: 10px; right: 12px;
  font-family: var(--mono); font-size: 8.5px;
  letter-spacing: 0.14em; color: var(--n500);
}
.chat-card:hover {
  background: var(--n100);
  box-shadow: 5px 5px 0 0 var(--ink);
  transform: translate(-3px, -3px);
  z-index: 2;
}
.chat-card:focus-visible { outline: 2px solid var(--ink); outline-offset: -4px; }
.chat-card-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 10px; }
.chat-card-title {
  font-family: var(--display); font-size: 23px; font-weight: 700;
  line-height: 1.12; letter-spacing: -0.015em;
  display: -webkit-box; -webkit-line-clamp: 2; line-clamp: 2;
  -webkit-box-orient: vertical; overflow: hidden;
}
.chat-card:hover .chat-delete { opacity: 1; }
.chat-card-preview {
  font-family: var(--body); font-size: 13.5px; line-height: 1.6;
  color: var(--n600); text-align: justify; hyphens: auto;
  display: -webkit-box; -webkit-line-clamp: 3; line-clamp: 3;
  -webkit-box-orient: vertical; overflow: hidden;
}
.chat-card-meta {
  display: flex; align-items: center; justify-content: space-between;
  margin-top: auto; padding-top: 12px;
  border-top: var(--rule-thin);
}
.chat-card-time {
  font-family: var(--mono); font-size: 9px;
  text-transform: uppercase; letter-spacing: 0.14em; color: var(--n600);
}

.home-empty {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; gap: 8px;
  padding: 90px 20px;
  border-bottom: var(--rule);
  animation: fadeIn 0.3s ease both;
}
.home-empty.hidden { display: none; }

/* ═════════════════════════════════════════════════════════════════
   CHAT — the reading room
   ═════════════════════════════════════════════════════════════════ */
.chat-layout {
  display: flex;
  flex: 1; min-height: 0;      /* height comes from the flex body, not a guess */
  overflow: hidden;
  max-width: 1280px; margin: 0 auto;
  border-left: var(--rule); border-right: var(--rule);
  background: var(--paper);
  position: relative; z-index: 1;
}

/* Inverted sidebar — the one black section */
.chat-sidebar {
  width: 288px; flex-shrink: 0;
  background: var(--ink);
  color: var(--paper);
  border-right: var(--rule);
  display: flex; flex-direction: column;
  /* No height:100% — it overrides flex stretch when the row height is
     indefinite and leaves the inverted column short of the fold. */
  overflow: hidden;
}
.chat-sidebar .label, .chat-sidebar .kicker { color: var(--n400); }
.chat-sidebar-top { padding: 18px 20px; border-bottom: 1px solid var(--n700); flex-shrink: 0; }
.chat-sidebar .logo-mark { background: var(--paper); color: var(--ink); }
.chat-sidebar .logo-text { color: var(--paper); }
.chat-sidebar .logo-row:hover .logo-mark { background: var(--accent); color: var(--paper); }
.back-link {
  font-family: var(--mono); font-size: 9.5px;
  text-transform: uppercase; letter-spacing: 0.14em;
  color: var(--n300);
  display: inline-flex; align-items: center; gap: 6px;
  margin-top: 12px;
  transition: color var(--snap), gap var(--snap);
}
.back-link:hover { color: var(--paper); gap: 10px; }

.model-section { padding: 16px 0; flex: 1; overflow-y: auto; }
.model-section > .label { padding: 0 20px 10px; }
.tier-sep { display: flex; align-items: center; gap: 10px; padding: 14px 20px 6px; }
.tier-line { flex: 1; height: 0; border-top: 1px solid var(--n700); }
.tier-label-text {
  font-family: var(--mono); font-size: 9px;
  text-transform: uppercase; letter-spacing: 0.18em;
  color: var(--n300); white-space: nowrap;
}
.model-row {
  display: flex; align-items: center; gap: 11px;
  padding: 11px 20px;
  cursor: pointer;
  border-left: 3px solid transparent;
  transition: background var(--snap), border-color var(--snap);
}
.model-row:hover { background: var(--n700); }
.model-row.selected { background: var(--n700); border-left-color: var(--paper); }
.model-row.selected .model-label { color: var(--paper); }
.tier-dot { width: 8px; height: 8px; background: var(--paper); flex-shrink: 0; }
.tier-dot.fast     { background: var(--paper); }
.tier-dot.balanced { background: var(--n300); }
.tier-dot.powerful { background: var(--accent); }
.model-info { flex: 1; min-width: 0; }
.model-label {
  font-family: var(--ui); font-size: 12.5px; font-weight: 600;
  color: var(--n300); display: block;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.model-desc {
  font-family: var(--body); font-size: 11px; color: var(--n300);
  display: block; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.model-context {
  font-family: var(--mono); font-size: 8.5px;
  color: var(--n300); flex-shrink: 0;
  border: 1px solid var(--n600); padding: 2px 5px;
}

.indexed-section, .session-section {
  padding: 16px 20px; border-top: 1px solid var(--n700); flex-shrink: 0;
}
.indexed-list { margin-top: 10px; display: flex; flex-direction: column; }
.indexed-item {
  font-family: var(--mono); font-size: 10.5px;
  color: var(--n300);
  padding: 7px 0; border-bottom: 1px solid var(--n700);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.indexed-item.indexed-empty { color: var(--n400); font-style: italic; border-bottom: none; }
.manage-link {
  font-family: var(--mono); font-size: 9.5px;
  text-transform: uppercase; letter-spacing: 0.14em;
  color: var(--n300);
  margin-top: 12px; display: inline-flex; align-items: center; gap: 5px;
  transition: color var(--snap), gap var(--snap);
}
.manage-link:hover { color: var(--paper); gap: 9px; }
.chat-sidebar .btn-ghost { border-color: var(--n300); color: var(--paper); }
.chat-sidebar .btn-ghost:hover { background: var(--paper); color: var(--ink); box-shadow: 4px 4px 0 0 var(--n600); }

/* ── Chat main ──────────────────────────────────────────────────── */
.chat-main { flex: 1; display: flex; flex-direction: column; overflow: hidden; min-width: 0; }

.chat-topbar {
  min-height: 46px; flex-shrink: 0;
  border-bottom: var(--rule);
  display: flex; align-items: center; justify-content: space-between;
  padding: 8px 22px; gap: 16px;
  background: var(--paper);
}
.topbar-model-info { display: flex; align-items: center; gap: 10px; min-width: 0; }
.topbar-model-name {
  font-family: var(--ui); font-size: 11px; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.14em; white-space: nowrap;
}
.topbar-model-sep { color: var(--n400); }
.topbar-model-desc {
  font-family: var(--body); font-size: 12px; color: var(--n600);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.conf-display { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
.conf-display.hidden { display: none; }
.conf-score {
  font-family: var(--mono); font-size: 12px; font-weight: 500;
  border: var(--rule); padding: 3px 8px;
}
.conf-score.high   { background: var(--ink);    color: var(--paper); }
.conf-score.medium { background: transparent;   color: var(--ink); }
.conf-score.low    { background: var(--accent); color: var(--paper); border-color: var(--accent); }

.messages { flex: 1; overflow-y: auto; padding: 28px 26px 34px; display: flex; flex-direction: column; }

.empty-state {
  flex: 1;
  display: flex; align-items: center; justify-content: center;
  flex-direction: column; text-align: center;
  padding: 40px;
  animation: fadeIn 0.3s ease both;
}
.empty-state.hidden { display: none; }
.empty-logo { width: 54px; height: 54px; background: var(--ink); margin-bottom: 18px; }
.empty-title {
  font-family: var(--display); font-size: 40px; font-weight: 900;
  text-transform: uppercase; letter-spacing: -0.02em;
}
.empty-sub {
  font-family: var(--mono); font-size: 10px;
  text-transform: uppercase; letter-spacing: 0.18em;
  color: var(--n600); margin-top: 8px;
}

/* User dispatch */
.msg.user {
  margin-left: auto; max-width: 62%;
  border: var(--rule);
  border-left: 4px solid var(--ink);
  background: var(--n100);
  padding: 13px 16px;
  font-family: var(--body); font-size: 15px; line-height: 1.6;
  margin-bottom: 26px;
  white-space: pre-wrap; word-break: break-word;
  animation: fadeInRight 0.2s ease-out both;
}

/* Assistant article */
.msg-wrap { max-width: 82%; margin-bottom: 30px; animation: fadeInLeft 0.2s ease-out both; }
.msg-tag {
  font-family: var(--mono); font-size: 9px;
  text-transform: uppercase; letter-spacing: 0.2em;
  color: var(--n600);
  display: block; padding-bottom: 6px;
  border-bottom: var(--rule);
  margin-bottom: 12px;
}
.msg.assistant { background: transparent; border: none; padding: 0; }
.msg-text {
  font-family: var(--body); font-size: 15.5px; line-height: 1.7;
  white-space: pre-wrap; word-break: break-word;
}
.msg.assistant.streaming .msg-text::after {
  content: '\258C';
  animation: blink 1s step-end infinite;
  margin-left: 1px;
}
.msg-meta {
  margin-top: 14px; padding-top: 10px;
  border-top: var(--rule);
  display: none;
  align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 10px;
}
.msg-meta.visible { display: flex; animation: fadeIn 0.2s ease; }
.conf-pill {
  font-family: var(--mono); font-size: 9.5px;
  text-transform: uppercase; letter-spacing: 0.14em;
  border: 1px solid var(--ink); padding: 3px 8px;
}
.conf-pill.high   { background: var(--ink); color: var(--paper); }
.conf-pill.medium { color: var(--ink); }
.conf-pill.low    { background: var(--accent); color: var(--paper); border-color: var(--accent); }
.sources-row { display: flex; flex-wrap: wrap; gap: 6px; }

.typing-indicator {
  border-left: 4px solid var(--ink);
  padding: 12px 16px;
  display: flex; align-items: center;
  max-width: 92px; margin-bottom: 26px;
  animation: fadeInLeft 0.2s ease-out both;
}
.typing-indicator.hidden { display: none; }
.typing-dots { display: flex; gap: 6px; }
.typing-dot { width: 7px; height: 7px; background: var(--ink); animation: pulse 1.2s infinite; }
.typing-dot:nth-child(2) { animation-delay: 0.15s; }
.typing-dot:nth-child(3) { animation-delay: 0.3s; }

/* ── Input ──────────────────────────────────────────────────────── */
.input-area { flex-shrink: 0; padding: 14px 22px 20px; position: relative; border-top: var(--rule); }
.input-wrap { border: var(--rule); background: var(--paper); transition: box-shadow var(--snap); }
.input-wrap:focus-within { box-shadow: 4px 4px 0 0 var(--ink); }
#msg-input {
  width: 100%; background: transparent;
  border: none; border-bottom: var(--rule-thin);
  padding: 14px 16px;
  font-family: var(--body); font-size: 15px; line-height: 1.6;
  resize: none; min-height: 52px; max-height: 170px;
  color: var(--ink);
  text-transform: none;
}
#msg-input:focus { background: transparent; }
.input-bottom {
  display: flex; align-items: center; justify-content: space-between;
  padding: 8px 10px 8px 14px;
}
.model-indicator {
  display: flex; align-items: center; gap: 8px;
  cursor: pointer; padding: 6px 10px;
  border: 1px solid transparent;
  min-height: 32px;
  transition: background var(--snap), border-color var(--snap);
}
.model-indicator:hover { background: var(--n100); border-color: var(--ink); }
.indicator-dot { width: 8px; height: 8px; flex-shrink: 0; background: var(--ink); }
.indicator-label {
  font-family: var(--mono); font-size: 10px;
  text-transform: uppercase; letter-spacing: 0.14em; color: var(--ink);
}
.input-actions { display: flex; align-items: center; gap: 10px; }
#char-count { font-family: var(--mono); font-size: 9.5px; color: var(--n600); }
#char-count.warn { color: var(--accent); }
.btn-attach {
  background: transparent; border: 1px solid transparent; cursor: pointer;
  color: var(--ink);
  min-width: 34px; min-height: 34px;
  display: flex; align-items: center; justify-content: center;
  transition: background var(--snap), color var(--snap), border-color var(--snap);
}
.btn-attach:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); }
#send-btn {
  width: 40px; height: 40px;
  background: var(--ink); color: var(--paper);
  border: 1px solid var(--ink); cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  transition: background var(--snap), color var(--snap), box-shadow var(--snap), transform var(--snap);
}
#send-btn:hover:not(:disabled) {
  background: var(--paper); color: var(--ink);
  box-shadow: 3px 3px 0 0 var(--ink);
  transform: translate(-2px, -2px);
}
#send-btn:disabled { background: var(--n200); color: var(--n600); border-color: var(--n400); cursor: not-allowed; }
#send-btn svg { color: currentColor; }

/* ── Model picker ───────────────────────────────────────────────── */
#model-picker {
  position: absolute;
  bottom: calc(100% - 6px); left: 22px;
  width: 330px;
  background: var(--ink); color: var(--paper);
  border: var(--rule);
  box-shadow: 6px 6px 0 0 var(--n400);
  padding: 8px 0;
  z-index: 50;
  animation: popIn 0.14s ease-out both;
}
#model-picker.hidden { display: none; }

/* ── Format chips ───────────────────────────────────────────────── */
.format-row { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; flex-wrap: wrap; }
.format-row-label { flex-shrink: 0; }
.format-chips { display: flex; flex-wrap: wrap; border: var(--rule); }
.chip {
  background: transparent; color: var(--ink);
  border: none; border-right: var(--rule);
  font-family: var(--ui); font-size: 10px; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.14em;
  padding: 9px 14px; min-height: 34px;
  cursor: pointer; white-space: nowrap;
  transition: background var(--snap), color var(--snap);
}
.chip:last-child { border-right: none; }
.chip:hover { background: var(--n100); }
.chip.active { background: var(--ink); color: var(--paper); }

/* ── Ripple ─────────────────────────────────────────────────────── */
.ripple-btn { position: relative; overflow: hidden; }
.ripple-span {
  position: absolute;
  transform: scale(0);
  animation: rippleAnim 0.5s linear;
  background: rgba(255,255,255,0.30);
  pointer-events: none;
}
.btn-ghost .ripple-span, .chip .ripple-span { background: rgba(17,17,17,0.14); }

/* ── Neural canvas — ink diagram behind the page ────────────────── */
#neural-canvas {
  position: fixed; inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.4;
}

/* ── Colophon (footer) ──────────────────────────────────────────── */
.colophon { border-top: var(--rule-heavy); background: var(--paper); position: relative; z-index: 1; }
.colophon-inner {
  max-width: 1280px; margin: 0 auto;
  padding: 18px 20px;
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; flex-wrap: wrap;
  font-family: var(--mono); font-size: 9.5px;
  text-transform: uppercase; letter-spacing: 0.16em;
  color: var(--n600);
}

/* ── In-chat attach progress ────────────────────────────────────── */
.attach-hint {
  font-family: var(--mono); font-size: 10px;
  text-transform: uppercase; letter-spacing: 0.12em;
  color: var(--ink);
  border-left: 3px solid var(--ink);
  padding: 6px 10px; margin-bottom: 8px;
  background: var(--n100);
  animation: fadeIn 0.2s ease-out;
}
.attach-hint.is-error { color: var(--accent); border-left-color: var(--accent); }

/* Drop zone locked while a batch uploads */
.drop-zone.is-busy { cursor: progress; opacity: 0.72; }
.drop-zone.is-busy:hover { transform: none; box-shadow: none; }

/* ── Util ───────────────────────────────────────────────────────── */
.hidden { display: none !important; }
.mt-8 { margin-top: 8px; }
.full-width { width: 100%; }
.sharp-corners { border-radius: 0 !important; }

/* ── Responsive ─────────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .auth-layout, .upload-layout { grid-template-columns: 1fr; }
  .auth-sidebar, .upload-sidebar { border-right: none; border-bottom: var(--rule); }
  .auth-main { padding: 30px 20px; }
}
@media (max-width: 768px) {
  body { font-size: 15px; }
  .masthead-brand { padding: 18px 0 10px; }
  .edition-line { font-size: 8.5px; letter-spacing: 0.1em; justify-content: center; }
  .upload-sidebar, .auth-sidebar { display: none; }
  .chat-sidebar { display: none; }
  .chat-layout { border-left: none; border-right: none; }
  .home-inner { padding: 0 16px 48px; }
  .home-header { padding: 26px 0 12px; }
  .home-header .btn-primary { width: 100%; }
  .chat-grid { grid-template-columns: 1fr; border-left: none; }
  .chat-card { border-right: none; }
  .chat-card:hover { transform: none; box-shadow: none; }
  .topnav-title { max-width: 150px; }
  .topnav-user { display: none; }
  .msg.user { max-width: 88%; }
  .msg-wrap { max-width: 96%; }
  .messages { padding: 20px 16px 26px; }
  .input-area { padding: 12px 16px 16px; }
  .upload-main { padding: 24px 18px 40px; }
  #model-picker { left: 16px; right: 16px; width: auto; }
  .url-row { flex-direction: column; }
  .url-row .btn { border-left: none; border-top: var(--rule); }
  .upload-bottom-bar { flex-direction: column; align-items: stretch; }
  .upload-bottom-bar .btn { width: 100%; }
  .dropcap::first-letter { font-size: 3.4em; }
}

/* ── Short-viewport compacting (14–15" laptops) ─────────────────────
   These are wide-but-short displays (often 1920x1080 at 125–150% OS
   scaling, or 1366x768), so max-width breakpoints never fire — it's
   viewport HEIGHT that's scarce. The masthead + ticker + edition-line
   stack alone can otherwise eat 250px before any real content shows,
   forcing a scroll just to reach the fold. Trim that chrome instead. */
@media (max-height: 820px) {
  .masthead-brand { padding: 16px 0 8px; }
  .masthead-title { font-size: clamp(30px, 5.5vw, 52px); }
  .masthead-sub { margin-top: 6px; }
  .edition-line { padding: 6px 0; }
  .ticker-track { padding: 6px 0; }
  .home-header { padding: 24px 0 10px; }
  .upload-sidebar-content { padding: 20px 26px; gap: 18px; }
  .upload-sidebar-top { padding: 16px 26px; }
  .auth-main { padding: 20px 30px; }
  .chat-sidebar-top { padding: 14px 20px; }
  .chat-topbar { padding: 6px 22px; }
  .messages { padding: 18px 26px 22px; }
  .input-area { padding: 10px 22px 14px; }
}
@media (max-height: 650px) {
  .ticker { display: none; }
  .masthead-brand { padding: 10px 0 6px; }
  .masthead-title { font-size: clamp(24px, 5vw, 36px); }
  .masthead-sub { display: none; }
  .edition-line { padding: 4px 0; }
}

/* ── Reduced motion — static fallback ───────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .ticker-track { animation: none !important; transform: none !important; }
  .typing-dot, .spinner { animation: none !important; }
  .msg.assistant.streaming .msg-text::after { animation: none !important; }
  .btn:hover, .chat-card:hover, .drop-zone:hover, #send-btn:hover { transform: none !important; }
}