:root {
  --paper: #faf9f5;
  --surface: #ffffff;
  --surface-2: #f3f1ea;
  --surface-3: #ebe8de;

  --ink: #0d0e0e;
  --ink-2: #2c2e30;
  --muted: #6c6f73;
  --muted-2: #9a9c9f;

  --rule: #e3e1d8;
  --rule-strong: #cfccc1;

  --accent: #1f3b6a;
  --accent-ink: #14264a;

  --critical: #b8201d;
  --critical-soft: rgba(184, 32, 29, 0.08);
  --critical-line: rgba(184, 32, 29, 0.30);

  --high: #b65d10;
  --high-soft: rgba(182, 93, 16, 0.10);
  --high-line: rgba(182, 93, 16, 0.30);

  --medium: #9a7615;
  --medium-soft: rgba(154, 118, 21, 0.10);
  --medium-line: rgba(154, 118, 21, 0.30);

  --ok: #1a6b4f;

  --sans: "Onest", "Inter Tight", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --serif: "Source Serif 4", "Source Serif Pro", Georgia, serif;
  --mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --radius-sm: 4px;
  --radius: 8px;
  --radius-lg: 12px;
}

* { box-sizing: border-box; }

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

body {
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "ss01", "cv11";
}

button, input, textarea, select { font: inherit; color: inherit; }

a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: rgba(31, 59, 106, 0.30);
  text-underline-offset: 3px;
}
a:hover { color: var(--accent-ink); text-decoration-color: var(--accent); }

.eyebrow {
  margin: 0 0 0.5rem;
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ============= LOGIN ============= */
.login-body {
  display: grid;
  place-items: center;
  padding: 2rem 1.5rem;
  min-height: 100vh;
}

.login-shell {
  width: min(1080px, 100%);
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 1px 0 var(--rule);
}

.login-copy {
  padding: 3.5rem 3rem;
  display: grid;
  align-content: end;
  min-height: 540px;
  background: var(--surface-2);
  border-right: 1px solid var(--rule);
  position: relative;
}

.login-copy::before {
  content: "";
  position: absolute;
  top: 0; left: 3rem; right: 3rem;
  height: 4px;
  background: var(--ink);
}

.login-copy h1 {
  margin: 0;
  font-family: var(--sans);
  font-weight: 700;
  font-size: clamp(2.4rem, 5vw, 4rem);
  line-height: 1;
  letter-spacing: -0.035em;
}

.lead {
  max-width: 36rem;
  margin: 1.4rem 0 0;
  font-family: var(--serif);
  font-size: 1.12rem;
  line-height: 1.55;
  color: var(--ink-2);
}

.login-notes {
  margin: 2.2rem 0 0;
  padding: 0;
  list-style: none;
  max-width: 36rem;
  border-top: 1px solid var(--rule-strong);
}

.login-notes li {
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--rule);
  color: var(--ink-2);
  font-size: 0.93rem;
  line-height: 1.5;
}

.login-panel {
  padding: 3rem 2.5rem;
  display: grid;
  align-content: center;
  background: var(--surface);
}

.panel-head h2 {
  margin: 0.3rem 0 0;
  font-family: var(--sans);
  font-weight: 700;
  font-size: 1.6rem;
  letter-spacing: -0.02em;
}

.panel-kicker {
  font-family: var(--mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

/* ============= FORMS ============= */
.login-form,
.metadata-form,
.upload-form {
  display: grid;
  gap: 0.85rem;
}

.login-form { margin-top: 1.6rem; }

.login-form label,
.metadata-form label,
.upload-form label {
  display: grid;
  gap: 0.3rem;
}

.login-form span,
.metadata-form span,
.upload-form span,
.mode-field legend {
  font-family: var(--mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

input,
textarea,
select {
  width: 100%;
  border: 1px solid var(--rule-strong);
  background: var(--surface);
  border-radius: var(--radius-sm);
  padding: 0.7rem 0.85rem;
  font-size: 0.95rem;
  color: var(--ink);
  transition: border-color 120ms ease, box-shadow 120ms ease;
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--ink);
  box-shadow: 0 0 0 3px rgba(13, 14, 14, 0.08);
}

textarea {
  resize: vertical;
  min-height: 80px;
  line-height: 1.5;
}

select {
  appearance: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'><path fill='none' stroke='%236c6f73' stroke-width='1.4' d='M1 1l4 4 4-4'/></svg>");
  background-repeat: no-repeat;
  background-position: right 0.85rem center;
  padding-right: 2rem;
}

/* ============= BUTTONS ============= */
.primary-button,
.secondary-button,
.ghost-button {
  appearance: none;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-weight: 500;
  transition: background 120ms ease, color 120ms ease, border-color 120ms ease;
}

.primary-button {
  background: var(--ink);
  color: var(--paper);
  padding: 0.75rem 1.2rem;
  font-size: 0.93rem;
  letter-spacing: 0.005em;
}
.primary-button:hover { background: #000; }
.primary-button:disabled { opacity: 0.55; cursor: default; }

.secondary-button {
  background: var(--surface);
  color: var(--ink);
  border-color: var(--rule-strong);
  padding: 0.6rem 1rem;
  font-size: 0.9rem;
}
.secondary-button:hover { border-color: var(--ink); }

.ghost-button {
  background: transparent;
  color: var(--muted);
  padding: 0.5rem 0.75rem;
  font-size: 0.85rem;
  font-family: var(--mono);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.ghost-button:hover { color: var(--ink); }

.form-error {
  margin: 0;
  padding: 0.7rem 0.85rem;
  border-radius: var(--radius-sm);
  background: var(--critical-soft);
  border: 1px solid var(--critical-line);
  color: var(--critical);
  font-size: 0.88rem;
  line-height: 1.4;
}

/* ============= APP SHELL ============= */
.app-body {
  min-height: 100vh;
  background: var(--paper);
}

.app-shell {
  display: grid;
  grid-template-columns: minmax(280px, 320px) minmax(0, 1fr);
  height: 100vh;
  overflow: hidden;
}

/* ============= SIDEBAR ============= */
.sidebar {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  background: var(--surface-2);
  border-right: 1px solid var(--rule);
  overflow: hidden;
}

.sidebar-top {
  padding: 1.5rem 1.4rem 1.1rem;
  border-bottom: 1px solid var(--rule);
  display: grid;
  gap: 1rem;
  position: relative;
}

.sidebar-top::before {
  content: "";
  position: absolute;
  top: 0; left: 1.4rem; right: 1.4rem;
  height: 3px;
  background: var(--ink);
}

.sidebar-brand { display: grid; gap: 0.45rem; }

.sidebar h1 {
  margin: 0;
  font-family: var(--sans);
  font-weight: 700;
  font-size: 1.55rem;
  line-height: 1.05;
  letter-spacing: -0.025em;
}

.sidebar h1 span { display: inline; }
.sidebar h1 span + span::before { content: " "; }

.sidebar-copy {
  margin: 0;
  color: var(--muted);
  font-size: 0.85rem;
  line-height: 1.5;
  font-family: var(--serif);
}

.sidebar-actions { display: grid; gap: 0.55rem; }
.sidebar-actions .secondary-button { width: 100%; }

.sidebar-caption {
  margin: 0;
  color: var(--muted-2);
  font-size: 0.72rem;
  line-height: 1.4;
  font-family: var(--mono);
  letter-spacing: 0.04em;
}

.chat-list {
  overflow: auto;
  min-height: 0;
}

.chat-list .thread-empty {
  border: none;
  background: transparent;
  min-height: auto;
  padding: 1.5rem 1.4rem;
  font-size: 0.88rem;
  color: var(--muted);
  font-family: var(--serif);
  text-align: left;
  place-items: start;
}

.chat-card {
  width: 100%;
  display: block;
  padding: 0.95rem 1.4rem;
  border: none;
  border-bottom: 1px solid var(--rule);
  background: transparent;
  text-align: left;
  cursor: pointer;
  transition: background 120ms ease, box-shadow 120ms ease;
  font-family: inherit;
}

.chat-card:hover { background: var(--surface-3); }

.chat-card.active {
  background: var(--surface);
  box-shadow: inset 3px 0 0 var(--ink);
}

.chat-card strong {
  display: block;
  margin-bottom: 0.25rem;
  font-weight: 600;
  font-size: 0.95rem;
  line-height: 1.3;
  color: var(--ink);
}

.chat-meta {
  font-size: 0.76rem;
  color: var(--muted);
  line-height: 1.4;
  font-family: var(--mono);
  letter-spacing: 0.005em;
}

.chat-meta + .chat-meta {
  margin-top: 0.15rem;
  color: var(--muted-2);
}

/* ============= WORKSPACE ============= */
.workspace {
  display: grid;
  grid-template-rows: auto auto 1fr auto;
  min-height: 0;
  overflow: hidden;
  background: var(--paper);
}

.workspace-header {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 1rem;
  padding: 1.3rem 2rem 1.1rem;
  border-bottom: 1px solid var(--rule);
  background: var(--surface);
}

.workspace-header h2 {
  margin: 0.2rem 0 0;
  font-family: var(--sans);
  font-weight: 700;
  font-size: clamp(1.5rem, 2vw, 2rem);
  line-height: 1.1;
  letter-spacing: -0.025em;
}

/* ============= METADATA STRIP ============= */
.metadata-strip {
  padding: 0.9rem 2rem 1rem;
  background: var(--surface);
  border-bottom: 1px solid var(--rule);
}

.metadata-form {
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 0.7rem 1.4rem;
}

.metadata-form label { gap: 0.2rem; }

.metadata-form input,
.metadata-form select {
  border: none;
  border-bottom: 1px solid var(--rule-strong);
  border-radius: 0;
  padding: 0.4rem 0;
  background: transparent;
  font-size: 0.94rem;
  font-weight: 500;
}

.metadata-form input:focus,
.metadata-form select:focus {
  border-bottom-color: var(--ink);
  box-shadow: none;
}

.metadata-form select {
  background-position: right 0 center;
  padding-right: 1.2rem;
}

.metadata-form input::placeholder {
  color: var(--muted-2);
  font-weight: 400;
}

/* ============= THREAD ============= */
.thread {
  min-height: 0;
  overflow: auto;
  padding: 1.5rem 2rem 2rem;
  display: grid;
  gap: 1.4rem;
  align-content: start;
}

.thread-empty {
  display: grid;
  place-items: center;
  min-height: 50vh;
  border: 1px dashed var(--rule-strong);
  border-radius: var(--radius);
  color: var(--muted);
  background: var(--surface);
  padding: 2rem;
  text-align: center;
  font-family: var(--serif);
  font-size: 1.05rem;
  line-height: 1.5;
}

/* ============= MESSAGES ============= */
.message {
  display: grid;
  gap: 0.85rem;
  padding: 1.4rem 1.6rem 1.6rem;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  width: 100%;
  max-width: 920px;
  animation: rise 220ms ease;
}

.message.user {
  justify-self: end;
  max-width: 640px;
  background: var(--surface-2);
}

.message.assistant {
  justify-self: stretch;
}

.message.processing {
  border-style: dashed;
}

.message.failed {
  border-color: var(--critical-line);
}

.message-head {
  display: flex;
  justify-content: space-between;
  gap: 0.8rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted);
  align-items: center;
  flex-wrap: wrap;
  padding-bottom: 0.7rem;
  border-bottom: 1px solid var(--rule);
}

.message-title {
  font-weight: 600;
  color: var(--ink);
  letter-spacing: 0.04em;
}

.message-body {
  white-space: pre-wrap;
  font-family: var(--serif);
  font-size: 1.02rem;
  line-height: 1.65;
  color: var(--ink-2);
  max-width: 65ch;
}

.message-subtle {
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.55;
  font-family: var(--serif);
}

.mode-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.15rem 0.5rem;
  border: 1px solid var(--rule-strong);
  border-radius: 2px;
  background: transparent;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 0.66rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* ============= REPORT STATBOARD ============= */
.report-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  margin: 0.4rem 0 0.8rem;
}

.stat {
  padding: 0.85rem 1rem;
  border-right: 1px solid var(--rule);
  display: grid;
  gap: 0.3rem;
  align-content: center;
}

.stat:last-child { border-right: none; }

.stat strong {
  display: block;
  font-family: var(--mono);
  font-size: 1.45rem;
  font-weight: 500;
  line-height: 1;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.stat span {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.section-label {
  margin: 1.5rem 0 0.7rem;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--rule);
}

/* ============= LISTS ============= */
.risk-list,
.guidance-list,
.claims-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0;
}

.risk-item,
.guidance-item {
  padding: 0.95rem 0;
  border-top: 1px solid var(--rule);
}

.risk-item:first-child,
.guidance-item:first-child {
  border-top: none;
  padding-top: 0.5rem;
}

.risk-item strong {
  font-family: var(--sans);
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
  display: block;
  margin-bottom: 0.4rem;
  line-height: 1.4;
}

.risk-item .message-subtle {
  display: block;
  margin: 0.3rem 0;
  font-family: var(--serif);
  font-size: 0.95rem;
  line-height: 1.55;
  color: var(--ink-2);
}

.risk-item span:not(.message-subtle) {
  font-family: var(--serif);
  font-size: 0.92rem;
  line-height: 1.5;
  color: var(--ink-2);
}

.guidance-item {
  font-family: var(--serif);
  font-size: 0.97rem;
  line-height: 1.55;
  color: var(--ink-2);
}

/* ============= CLAIM ITEMS ============= */
.claim-item {
  position: relative;
  padding: 1rem 0 1rem 1rem;
  border-top: 1px solid var(--rule);
  border-left: 3px solid var(--rule-strong);
}

.claim-item:first-child {
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
}

.claim-item:has(.tag.critical) { border-left-color: var(--critical); }
.claim-item:has(.tag.high) { border-left-color: var(--high); }
.claim-item:has(.tag.medium) { border-left-color: var(--medium); }

.claim-topline {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 0.55rem;
}

.claim-item p {
  margin: 0.4rem 0;
  font-family: var(--serif);
  font-size: 0.97rem;
  line-height: 1.6;
  color: var(--ink-2);
}

.claim-item p strong {
  font-family: var(--serif);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.5;
}

.claim-item .message-subtle {
  font-family: var(--serif);
  font-size: 0.92rem;
  color: var(--muted);
  line-height: 1.55;
}

/* ============= TAGS ============= */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.22rem 0.55rem;
  border-radius: 2px;
  font-family: var(--mono);
  font-size: 0.66rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: var(--surface-3);
  color: var(--ink-2);
  border: 1px solid var(--rule-strong);
}

.tag.critical {
  background: var(--critical-soft);
  color: var(--critical);
  border-color: var(--critical-line);
}

.tag.high {
  background: var(--high-soft);
  color: var(--high);
  border-color: var(--high-line);
}

.tag.medium {
  background: var(--medium-soft);
  color: var(--medium);
  border-color: var(--medium-line);
}

/* ============= SOURCES ============= */
.source-list {
  display: grid;
  gap: 0.3rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.source-list li {
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.5;
}

.source-list a {
  color: var(--accent);
  font-family: var(--mono);
  font-weight: 400;
  text-decoration: underline;
  text-decoration-color: rgba(31, 59, 106, 0.3);
  text-underline-offset: 3px;
  overflow-wrap: anywhere;
}

.source-list a:hover {
  text-decoration-color: var(--accent);
}

.verification-box {
  display: grid;
  gap: 0.5rem;
  margin-top: 0.75rem;
  padding: 0.75rem 0.9rem;
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  border-left: 2px solid var(--rule-strong);
}

.verification-box .message-subtle {
  font-family: var(--serif);
  font-size: 0.92rem;
  color: var(--ink-2);
}

.verification-box--pending {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
  padding: 0.55rem 0.8rem;
  background: transparent;
  border-left: 2px dashed var(--rule-strong);
}

.verification-box--pending .tag {
  background: transparent;
  color: var(--muted);
  border-color: var(--rule-strong);
}

.verify-button {
  appearance: none;
  border: 1px solid var(--rule-strong);
  background: var(--surface);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.35rem 0.7rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 120ms ease, border-color 120ms ease, color 120ms ease;
}

.verify-button:hover:not(:disabled) {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

.verify-button:disabled {
  cursor: default;
  opacity: 0.6;
}

.verification-box--loading {
  opacity: 0.85;
}

.verify-error {
  flex-basis: 100%;
  margin: 0.25rem 0 0;
  color: var(--critical);
  font-size: 0.82rem;
}

/* ============= COMPOSER ============= */
.composer {
  border-top: 1px solid var(--rule);
  background: var(--surface);
  padding: 1rem 2rem 1.1rem;
}

.upload-form {
  grid-template-columns: auto auto 1fr auto;
  grid-template-areas:
    "mode source spacer actions"
    "note note   note    note"
    "input input input   input"
    "error error error   error";
  align-items: end;
  gap: 0.7rem 1rem;
}

.mode-field,
.source-field {
  display: grid;
  gap: 0.3rem;
  margin: 0;
  padding: 0;
  border: none;
}

.mode-field { grid-area: mode; }
.source-field { grid-area: source; }
.source-inputs { grid-area: input; }
.composer-error { grid-area: error; }

.mode-toggle.source-toggle {
  grid-template-columns: repeat(3, minmax(58px, 1fr));
  width: min(260px, 100%);
}

.source-input {
  display: grid;
  gap: 0.3rem;
}

.source-input[hidden] { display: none; }

.source-input textarea {
  min-height: 110px;
  font-family: var(--serif);
  font-size: 0.97rem;
  line-height: 1.55;
}

.mode-toggle {
  display: inline-grid;
  grid-template-columns: repeat(2, minmax(64px, 1fr));
  width: min(180px, 100%);
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.mode-toggle label {
  position: relative;
  display: block;
}

.mode-toggle label + label {
  border-left: 1px solid var(--rule-strong);
}

.mode-toggle input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.mode-toggle span {
  display: grid;
  place-items: center;
  min-height: 36px;
  background: var(--surface);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.74rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 120ms ease, color 120ms ease;
}

.mode-toggle input:checked + span {
  background: var(--ink);
  color: var(--paper);
}

.mode-toggle input:focus-visible + span {
  box-shadow: inset 0 0 0 2px rgba(13, 14, 14, 0.5);
}

.note-field { grid-area: note; }

.composer-actions {
  grid-area: actions;
  display: grid;
  gap: 0.55rem;
  align-self: end;
  justify-items: end;
}

.note-field textarea {
  min-height: 44px;
  max-height: 44px;
  padding-top: 0.55rem;
  padding-bottom: 0.55rem;
  font-size: 0.92rem;
}

.file-picker {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  min-height: 44px;
  padding: 0.3rem 0.4rem 0.3rem 0.5rem;
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius-sm);
  background: var(--surface);
  overflow: hidden;
}

.file-picker:focus-within {
  border-color: var(--ink);
  box-shadow: 0 0 0 3px rgba(13, 14, 14, 0.08);
}

.file-picker input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.file-picker-button {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-sm);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--mono);
  font-size: 0.74rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  white-space: nowrap;
}

.file-picker-name {
  min-width: 0;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.85rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.composer-actions .primary-button {
  min-width: 180px;
  height: 44px;
  font-family: var(--sans);
  font-size: 0.9rem;
}

/* ============= SPINNER ============= */
.spinner {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.spinner::before {
  content: "";
  width: 0.6rem;
  height: 0.6rem;
  border-radius: 50%;
  border: 1.5px solid var(--rule-strong);
  border-top-color: var(--ink);
  animation: spin 800ms linear infinite;
}

/* ============= ANIMATIONS ============= */
@keyframes rise {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ============= SCROLLBARS ============= */
.thread::-webkit-scrollbar,
.chat-list::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

.thread::-webkit-scrollbar-thumb,
.chat-list::-webkit-scrollbar-thumb {
  background: var(--rule-strong);
  border-radius: 4px;
}

.thread::-webkit-scrollbar-track,
.chat-list::-webkit-scrollbar-track {
  background: transparent;
}

/* ============= RESPONSIVE ============= */
@media (max-width: 1024px) {
  .app-shell {
    grid-template-columns: 1fr;
    height: auto;
    overflow: visible;
  }

  .sidebar {
    border-right: none;
    border-bottom: 1px solid var(--rule);
    overflow: visible;
  }

  .chat-list {
    max-height: 240px;
  }

  .workspace {
    overflow: visible;
  }

  .thread {
    overflow: visible;
    padding: 1.2rem 1.4rem 1.6rem;
  }

  .workspace-header,
  .metadata-strip,
  .composer {
    padding-left: 1.4rem;
    padding-right: 1.4rem;
  }

  .login-shell {
    grid-template-columns: 1fr;
  }

  .login-copy {
    border-right: none;
    border-bottom: 1px solid var(--rule);
    min-height: auto;
    padding: 2.2rem 1.6rem;
  }

  .login-copy::before {
    left: 1.6rem;
    right: 1.6rem;
  }

  .login-panel {
    padding: 2.2rem 1.6rem;
  }

  .upload-form {
    grid-template-columns: 1fr;
    grid-template-areas:
      "mode"
      "source"
      "note"
      "input"
      "actions"
      "error";
  }

  .mode-toggle.source-toggle {
    width: 100%;
  }

  .composer-actions {
    justify-items: stretch;
  }

  .composer-actions .primary-button {
    width: 100%;
    min-width: 0;
  }

  .message.user,
  .message.assistant {
    max-width: 100%;
  }
}

@media (max-width: 600px) {
  .workspace-header,
  .metadata-strip,
  .composer,
  .thread {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .stat { padding: 0.7rem 0.85rem; }
  .stat strong { font-size: 1.2rem; }
  .message { padding: 1.1rem 1.1rem 1.3rem; }
  .message-body { font-size: 0.98rem; }
}