:root {
  --bg: #f6f7fb;
  --surface: #ffffff;
  --surface-2: #f0f1f6;
  --border: #e1e4ec;
  --text: #1b1e28;
  --text-muted: #62667a;
  --primary: #3454d1;
  --primary-hover: #2843b3;
  --primary-tint: #eaeefb;
  --success: #1a8754;
  --success-tint: #e8f7ef;
  --danger: #d0342c;
  --danger-tint: #fbeceb;
  --warning: #b8860b;
  --warning-tint: #fbf3df;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(20,20,40,.04), 0 8px 24px rgba(20,20,40,.06);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14151c;
    --surface: #1c1e28;
    --surface-2: #23252f;
    --border: #2e3140;
    --text: #eceef4;
    --text-muted: #9498ab;
    --primary: #6c85f2;
    --primary-hover: #8398f5;
    --primary-tint: #232a4a;
    --success: #3ecf8e;
    --success-tint: #16281f;
    --danger: #f0685f;
    --danger-tint: #331c1c;
    --warning: #e0b64a;
    --warning-tint: #332b12;
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.35);
  }
}
:root[data-theme="dark"] {
  --bg: #14151c; --surface: #1c1e28; --surface-2: #23252f; --border: #2e3140;
  --text: #eceef4; --text-muted: #9498ab; --primary: #6c85f2; --primary-hover: #8398f5;
  --primary-tint: #232a4a; --success: #3ecf8e; --success-tint: #16281f;
  --danger: #f0685f; --danger-tint: #331c1c; --warning: #e0b64a; --warning-tint: #332b12;
}
:root[data-theme="light"] {
  --bg: #f6f7fb; --surface: #ffffff; --surface-2: #f0f1f6; --border: #e1e4ec;
  --text: #1b1e28; --text-muted: #62667a; --primary: #3454d1; --primary-hover: #2843b3;
  --primary-tint: #eaeefb; --success: #1a8754; --success-tint: #e8f7ef;
  --danger: #d0342c; --danger-tint: #fbeceb; --warning: #b8860b; --warning-tint: #fbf3df;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, sans-serif;
  display: flex; flex-direction: column;
  overflow: hidden; /* the app and the chat sidebar scroll internally, not the page */
}
h1, h2, h3 { line-height: 1.25; margin: 0 0 .4em; }
p { margin: 0 0 .8em; }
button { font: inherit; }

/* ── topbar ─────────────────────────────────────────────────── */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 24px; border-bottom: 1px solid var(--border);
  background: var(--surface); flex-shrink: 0; z-index: 10;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 600; }
.brand-mark {
  width: 30px; height: 30px; border-radius: 9px; background: var(--primary);
  color: #fff; display: grid; place-items: center; font-size: 13px; font-weight: 700;
}
.topbar-right { display: flex; align-items: center; gap: 14px; }
.stage-label { font-size: 13px; color: var(--text-muted); }

/* ── page layout: main content + docked chat sidebar ───────────── */
.layout { flex: 1; min-height: 0; display: flex; position: relative; }

.app { flex: 1; min-width: 0; overflow-y: auto; padding: 40px 24px 100px; }
.app-inner { max-width: 760px; margin: 0 auto; }
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px; box-shadow: var(--shadow); margin-bottom: 20px;
}
.card + .card { margin-top: 20px; }
.muted { color: var(--text-muted); }
.center { text-align: center; }

/* ── buttons ────────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px 22px; border-radius: 10px; border: 1px solid transparent;
  background: var(--primary); color: #fff; font-weight: 600; cursor: pointer;
  transition: background .15s ease, transform .05s ease;
}
.btn:hover { background: var(--primary-hover); }
.btn:active { transform: scale(.98); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-secondary { background: var(--surface-2); color: var(--text); border-color: var(--border); }
.btn-secondary:hover { background: var(--border); }
.btn-danger { background: var(--danger); }
.btn-danger:hover { filter: brightness(1.08); }
.btn-row { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 20px; }
.btn-block { width: 100%; }

/* ── landing ────────────────────────────────────────────────── */
.landing { text-align: center; padding: 40px 10px; }
.landing .lede { font-size: 17px; color: var(--text-muted); max-width: 480px; margin: 0 auto 28px; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin: 32px 0; text-align: left; }
.feature { background: var(--surface-2); border-radius: 12px; padding: 16px; }
.feature .icon { font-size: 20px; }
.feature h3 { font-size: 14px; margin: 8px 0 4px; }
.feature p { font-size: 13px; color: var(--text-muted); margin: 0; }
@media (max-width: 640px) { .feature-grid { grid-template-columns: 1fr; } }

/* ── auth gate (auth.js) ────────────────────────────────────── */
.auth-screen { max-width: 380px; margin: 60px auto; }
.auth-error { color: var(--danger); font-size: 13px; margin-top: 14px; }

/* ── workspace: upload + document manifest (persistent, all stages) ──── */
.workspace-card { position: relative; }
.workspace-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.workspace-head h2 { margin: 0; }
.workspace-count { font-size: 13px; white-space: nowrap; }

.dropzone {
  border: 2px dashed var(--border); border-radius: var(--radius); padding: 30px 20px;
  text-align: center; cursor: pointer; transition: border-color .15s, background .15s;
}
.dropzone.dragover { border-color: var(--primary); background: var(--primary-tint); }
.dropzone .dz-icon { font-size: 28px; margin-bottom: 8px; min-height: 34px; }
.dz-sub { font-size: 12.5px; margin-top: 4px; }
.link-btn {
  display: block; margin: 8px auto 0; background: none; border: none; color: var(--primary);
  font-size: 13px; cursor: pointer; text-decoration: underline; text-underline-offset: 2px;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .92em;
  background: var(--surface-2); padding: 1px 5px; border-radius: 5px;
}

.callout-info { background: var(--primary-tint); color: var(--primary); }
.recompute-banner {
  display: flex; align-items: center; justify-content: space-between; gap: 14px; flex-wrap: wrap;
}
.recompute-actions { display: flex; gap: 8px; flex-shrink: 0; }
.recompute-actions .btn { padding: 8px 14px; font-size: 13px; }

.doc-list { margin-top: 18px; display: flex; flex-direction: column; gap: 8px; }
.doc-list-empty { text-align: center; padding: 10px 4px; margin: 0; }
.doc-row {
  display: flex; align-items: center; gap: 10px;
  background: var(--surface-2); border-radius: 10px; padding: 10px 14px; font-size: 14px;
}
.doc-check { display: flex; align-items: center; gap: 10px; flex: 1; min-width: 0; cursor: pointer; }
.doc-check input { flex-shrink: 0; width: 16px; height: 16px; accent-color: var(--primary); cursor: pointer; }
.doc-row .doc-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.doc-row .doc-size { color: var(--text-muted); font-size: 12px; flex-shrink: 0; }
.doc-remove {
  background: none; border: none; color: var(--text-muted); cursor: pointer;
  font-size: 14px; padding: 2px 4px; flex-shrink: 0; border-radius: 4px;
}
.doc-remove:hover { color: var(--danger); background: var(--danger-tint); }

/* ── stepper ────────────────────────────────────────────────── */
.stepper { display: flex; flex-direction: column; gap: 4px; }
.step {
  display: flex; align-items: flex-start; gap: 14px; padding: 12px 4px;
  border-left: 2px solid var(--border); margin-left: 11px; padding-left: 20px;
}
.step:last-child { border-left-color: transparent; }
.step-dot {
  width: 22px; height: 22px; border-radius: 50%; flex-shrink: 0; margin-left: -31px;
  display: grid; place-items: center; font-size: 12px; font-weight: 700;
  background: var(--surface-2); border: 2px solid var(--border); color: var(--text-muted);
}
.step.done .step-dot { background: var(--success); border-color: var(--success); color: #fff; }
.step.active .step-dot { background: var(--primary); border-color: var(--primary); color: #fff; animation: pulse 1.4s infinite; }
.step.error .step-dot { background: var(--danger); border-color: var(--danger); color: #fff; }
.step-label { font-weight: 600; font-size: 14px; }
.step-detail { font-size: 13px; color: var(--text-muted); margin-top: 2px; }
@keyframes pulse { 0%,100% { box-shadow: 0 0 0 0 rgba(52,84,209,.35); } 50% { box-shadow: 0 0 0 6px rgba(52,84,209,0); } }

/* ── summary ────────────────────────────────────────────────── */
.summary-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin: 18px 0; }
@media (max-width: 560px) { .summary-grid { grid-template-columns: 1fr; } }
.summary-tile { background: var(--surface-2); border-radius: 12px; padding: 16px; }
.summary-tile .label { font-size: 12px; text-transform: uppercase; letter-spacing: .04em; color: var(--text-muted); margin-bottom: 6px; }
.summary-tile .value { font-size: 22px; font-weight: 700; }
.summary-tile .value.positive { color: var(--success); }
.summary-tile .value.negative { color: var(--danger); }
.summary-tile .sub { font-size: 12px; color: var(--text-muted); margin-top: 4px; }

.callout { border-radius: 12px; padding: 14px 16px; margin: 14px 0; font-size: 14px; }
.callout-warning { background: var(--warning-tint); color: var(--warning); }
.callout-danger { background: var(--danger-tint); color: var(--danger); }
.callout-success { background: var(--success-tint); color: var(--success); }
.callout ul { margin: 6px 0 0; padding-left: 18px; }

.gate-list, .discrepancy-list { list-style: none; margin: 10px 0 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.gate-row { display: flex; gap: 10px; align-items: flex-start; font-size: 14px; }
.gate-icon { flex-shrink: 0; }
.gate-icon.pass { color: var(--success); }
.gate-icon.fail { color: var(--danger); }

/* ── follow-up questions ────────────────────────────────────── */
.question-block { border-top: 1px solid var(--border); padding: 16px 0; }
.question-block:first-child { border-top: none; padding-top: 0; }
.question-toggle { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.toggle-group { display: flex; gap: 8px; }
.toggle-btn {
  padding: 7px 16px; border-radius: 8px; border: 1px solid var(--border);
  background: var(--surface-2); color: var(--text); cursor: pointer; font-size: 13px; font-weight: 600;
}
.toggle-btn.active { background: var(--primary); border-color: var(--primary); color: #fff; }
.amount-row { margin-top: 12px; display: flex; align-items: center; gap: 8px; }
.amount-row input { flex: 1; }

input[type="text"], input[type="number"], textarea {
  width: 100%; padding: 10px 12px; border-radius: 9px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); font: inherit;
}
textarea { resize: vertical; min-height: 70px; }
label.field-label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; }

.checkbox-row { display: flex; align-items: flex-start; gap: 10px; margin-top: 14px; font-size: 14px; }
.checkbox-row input { margin-top: 3px; }

/* ── forms list ─────────────────────────────────────────────── */
.form-card {
  display: flex; align-items: center; justify-content: space-between; gap: 14px;
  background: var(--surface-2); border-radius: 12px; padding: 16px; margin-bottom: 10px;
}
.form-card .form-id { font-weight: 700; }
.form-card .form-desc { font-size: 13px; color: var(--text-muted); margin-top: 2px; }
.form-card .form-actions { display: flex; gap: 8px; flex-shrink: 0; }
.form-actions .btn { padding: 8px 14px; font-size: 13px; }

.manual-item { padding: 10px 0; border-top: 1px solid var(--border); font-size: 14px; }
.manual-item:first-child { border-top: none; }
.manual-item .item-name { font-weight: 600; }
.manual-item .item-reason { color: var(--text-muted); font-size: 13px; }

/* ── loader ─────────────────────────────────────────────────── */
.spinner {
  width: 36px; height: 36px; border-radius: 50%; margin: 0 auto 16px;
  border: 3px solid var(--border); border-top-color: var(--primary);
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── chat sidebar: docked into the page layout, not a floating widget ── */
.chat-toggle-mobile {
  display: none; align-items: center; gap: 6px; padding: 7px 14px; border-radius: 8px;
  background: var(--surface-2); border: 1px solid var(--border); color: var(--text);
  cursor: pointer; font-size: 13px; font-weight: 600;
}
.chat-toggle-mobile:hover { background: var(--border); }

.chat-sidebar {
  width: 380px; flex-shrink: 0; display: flex; flex-direction: column;
  border-left: 1px solid var(--border); background: var(--surface);
}
.chat-header {
  display: flex; align-items: center; gap: 8px; padding: 16px 18px;
  border-bottom: 1px solid var(--border); font-weight: 600; flex-shrink: 0;
}
.chat-header-icon { color: var(--primary); font-size: 15px; }
.chat-close-mobile { display: none; margin-left: auto; }
.icon-btn { background: none; border: none; color: var(--text-muted); cursor: pointer; font-size: 15px; }
.icon-btn:hover { color: var(--text); }
.chat-messages { flex: 1; overflow-y: auto; padding: 16px 18px; display: flex; flex-direction: column; gap: 12px; }
.msg { max-width: 92%; padding: 10px 13px; border-radius: 12px; font-size: 13.5px; line-height: 1.45; white-space: pre-wrap; }
.msg-user { align-self: flex-end; background: var(--primary); color: #fff; border-bottom-right-radius: 3px; }
.msg-assistant { align-self: flex-start; background: var(--surface-2); border-bottom-left-radius: 3px; }
.msg-blocked { align-self: flex-start; background: var(--warning-tint); color: var(--warning); border-bottom-left-radius: 3px; }
.msg-typing { align-self: flex-start; color: var(--text-muted); font-style: italic; }
.chat-input-row { display: flex; gap: 8px; padding: 14px; border-top: 1px solid var(--border); flex-shrink: 0; }
.chat-input-row input {
  flex: 1; padding: 10px 12px; border-radius: 20px; border: 1px solid var(--border);
  background: var(--surface-2); color: var(--text);
}
.send-btn { width: 38px; height: 38px; border-radius: 50%; background: var(--primary); color: #fff; flex-shrink: 0; }
.send-btn:hover { background: var(--primary-hover); }

@media (max-width: 960px) {
  .chat-sidebar {
    position: absolute; top: 0; right: 0; bottom: 0; width: min(380px, 92vw);
    transform: translateX(100%); transition: transform .2s ease; z-index: 40;
    box-shadow: var(--shadow);
  }
  .chat-sidebar.open { transform: translateX(0); }
  .chat-toggle-mobile { display: inline-flex; }
  .chat-close-mobile { display: inline-block; }
}