:root {
  --bg: #0f1115;
  --panel: #1a1d24;
  --panel-2: #252933;
  --text: #e6e8ec;
  --muted: #9aa3b0;
  --primary: #4f8cff;
  --primary-dark: #3a6dff;
  --error: #ff5c7a;
  --ok: #43d17a;
  --warn: #f0b429;
  --border: #333842;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.hidden { display: none !important; }
.muted { color: var(--muted); font-size: 0.9rem; }
.error { color: var(--error); font-size: 0.9rem; margin: 0.3rem 0; min-height: 1rem; }
.settings-saved { color: var(--ok); font-size: 0.85rem; margin: 0.3rem 0; min-height: 1rem; }

/* Login */
.login-container { display: flex; align-items: center; justify-content: center; min-height: 100vh; padding: 1rem; }
.login-card { background: var(--panel); padding: 2.5rem; border-radius: 12px; border: 1px solid var(--border); width: 100%; max-width: 380px; box-shadow: 0 8px 30px rgba(0,0,0,0.4); }
.app-title { margin: 0 0 0.25rem 0; font-size: 2rem; font-weight: 700; letter-spacing: -0.5px; }
.app-subtitle { color: var(--muted); margin: 0 0 1.5rem 0; font-size: 0.95rem; }
.login-form { display: flex; flex-direction: column; gap: 0.75rem; }

/* Topbar */
.topbar { display: flex; align-items: center; gap: 1rem; padding: 0.75rem 1.5rem; border-bottom: 1px solid var(--border); background: var(--panel); position: sticky; top: 0; z-index: 10; }
.topbar .app-title { font-size: 1.3rem; margin: 0; }
.build-tag { font-size: 0.68rem; color: var(--muted); border: 1px solid var(--border); border-radius: 999px; padding: 0.1rem 0.45rem; }
.topbar .btn { margin-left: auto; }

/* Tabs */
.tabs { display: flex; gap: 0.25rem; }
.tab { background: transparent; border: 1px solid transparent; color: var(--muted); padding: 0.45rem 0.9rem; border-radius: 8px; cursor: pointer; font-size: 0.9rem; }
.tab:hover { color: var(--text); }
.tab.active { background: var(--panel-2); color: var(--text); border-color: var(--border); }

/* Layout — vertical stack */
main { max-width: 1200px; margin: 0 auto; }
.stack { display: flex; flex-direction: column; gap: 1rem; padding: 1.5rem; }
.panel { background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 1.5rem; display: flex; flex-direction: column; gap: 1rem; }
#tab-history .panel { margin: 1.5rem; }
.panel h2 { margin: 0; font-size: 1.2rem; }
.panel-header { display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.preview-actions { display: flex; gap: 0.5rem; flex-wrap: wrap; }

/* Buttons */
.btn { cursor: pointer; border: 1px solid var(--border); background: var(--panel-2); color: var(--text); padding: 0.55rem 1rem; border-radius: 8px; font-size: 0.9rem; transition: background 0.15s ease; display: inline-flex; align-items: center; gap: 0.45rem; }
.btn:hover { background: #333842; }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-outline { background: transparent; }
.btn-outline.active { border-color: var(--primary); color: var(--primary); }
.btn-sm { padding: 0.3rem 0.6rem; font-size: 0.8rem; }

/* Inline button spinner */
.btn-cancel { color: var(--error); border-color: var(--error); }
.btn-cancel:hover { background: rgba(255, 92, 122, 0.12); }
.preset-buttons { display: flex; gap: 0.4rem; flex-wrap: wrap; }
.btn-spinner { width: 13px; height: 13px; border: 2px solid rgba(255,255,255,0.35); border-top-color: #fff; border-radius: 50%; animation: spin 0.8s linear infinite; }
.btn-outline .btn-spinner { border-color: var(--border); border-top-color: var(--primary); }

/* Form */
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; }
.form-group { display: flex; flex-direction: column; gap: 0.35rem; }
.form-group label { font-size: 0.82rem; color: var(--muted); }
.form-group input, .form-group textarea, .form-group select { background: var(--panel-2); border: 1px solid var(--border); border-radius: 8px; padding: 0.55rem 0.7rem; color: var(--text); font-size: 0.9rem; font-family: inherit; }
.form-group textarea { min-height: 5rem; resize: vertical; }
.checkbox { display: flex; align-items: center; gap: 0.5rem; font-size: 0.9rem; color: var(--muted); }

/* Upload */
.upload-area { border: 2px dashed var(--border); border-radius: 12px; padding: 1.5rem; text-align: center; cursor: pointer; color: var(--muted); transition: border-color 0.15s ease; }
.upload-area:hover { border-color: var(--primary); color: var(--text); }

/* Spinner */
.spinner { width: 26px; height: 26px; margin: 0.75rem auto 0; border: 3px solid var(--border); border-top-color: var(--primary); border-radius: 50%; animation: spin 0.8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* Progress */
.progress { margin: 0.75rem 0 0; height: 6px; background: var(--panel-2); border-radius: 3px; overflow: hidden; }
.progress-bar { height: 100%; width: 0; background: var(--primary); transition: width 0.2s ease; }

/* Settings */
.settings { border-top: 1px solid var(--border); padding-top: 0.5rem; }
.settings summary { cursor: pointer; color: var(--muted); }
.settings-section-title { margin: 0.9rem 0 0.2rem; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--primary); }
.settings-advanced { margin-top: 0.5rem; border-top: 1px dashed var(--border); padding-top: 0.5rem; }

/* Preview */
.preview-info { font-size: 0.9rem; color: var(--muted); min-height: 1.4rem; }
.preview-pager { display: flex; align-items: center; gap: 0.75rem; }
.pager-label { font-size: 0.85rem; color: var(--muted); }
.preview-grid { display: flex; flex-direction: column; gap: 1rem; }
.page-view { display: flex; flex-direction: column; gap: 0.75rem; }

.overlay-toolbar { display: flex; align-items: center; gap: 0.4rem; flex-wrap: wrap; }
.score-line { font-size: 0.8rem; color: var(--muted); display: flex; align-items: center; gap: 0.6rem; flex-wrap: wrap; }
:root { --score-good: #2ecc71; --score-bad: #ff5c7a; }
.score-chip { display: inline-flex; align-items: center; gap: 0.3rem; white-space: nowrap; }
.score-pie { flex: none; }

/* Page image with OCR overlay */
.page-stage { position: relative; width: 100%; background: #0b0d11; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.page-stage .page-image { display: block; width: 100%; height: auto; }
.overlay-layer { position: absolute; inset: 0; pointer-events: none; }
.overlay-block {
  position: absolute; overflow: hidden; color: #000; line-height: 1.05;
  white-space: pre-wrap; word-break: break-word;
  background: rgba(79, 140, 255, 0.16); outline: 1px solid rgba(79, 140, 255, 0.35);
}
.overlay-block::selection { background: rgba(79,140,255,0.4); }
.overlay-color-label { display: inline-flex; align-items: center; gap: 0.35rem; font-size: 0.8rem; color: var(--muted); }
.overlay-color { width: 30px; height: 24px; padding: 0; border: 1px solid var(--border); border-radius: 6px; background: transparent; cursor: pointer; }

.docx-preview { background: var(--panel-2); border: 1px solid var(--border); border-radius: 8px; padding: 0.75rem; }

.flow-panels { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.preview-pane { background: var(--panel-2); border: 1px solid var(--border); border-radius: 8px; padding: 0.75rem; display: flex; flex-direction: column; gap: 0.5rem; }
.pane-head { display: flex; align-items: center; justify-content: space-between; gap: 0.5rem; }
.pane-head h3 { margin: 0; font-size: 0.78rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.05em; }
.pane-body { display: flex; flex-direction: column; gap: 0.5rem; }
.preview-pane .text { font-size: 0.88rem; line-height: 1.5; white-space: pre-wrap; max-height: 260px; overflow-y: auto; }
.text-edit { width: 100%; min-height: 180px; background: var(--panel); color: var(--text); border: 1px solid var(--primary); border-radius: 8px; padding: 0.5rem; font-family: inherit; font-size: 0.88rem; resize: vertical; }

/* History */
.history-list { display: flex; flex-direction: column; gap: 0.6rem; }
.history-row { display: flex; align-items: center; justify-content: space-between; gap: 1rem; background: var(--panel-2); border: 1px solid var(--border); border-radius: 8px; padding: 0.7rem 0.9rem; }
.history-title { font-size: 0.95rem; }
.history-meta { font-size: 0.78rem; color: var(--muted); }
.history-actions { display: flex; align-items: center; gap: 0.4rem; }

/* Issues (chat) */
.issues-layout { display: grid; grid-template-columns: minmax(0, 380px) minmax(0, 1fr); gap: 1rem; padding: 1.5rem; }
.issues-layout .panel { min-height: 60vh; min-width: 0; }
.issue-list { display: flex; flex-direction: column; gap: 0.5rem; overflow-y: auto; max-height: 52vh; }
.issue-new-row { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 0.5rem; }
.issue-new-row select { background: var(--panel-2); border: 1px solid var(--border); border-radius: 8px; padding: 0.55rem 0.7rem; color: var(--text); font-size: 0.9rem; font-family: inherit; min-width: 0; width: 100%; }
.issue-row { background: var(--panel-2); border: 1px solid var(--border); border-radius: 8px; padding: 0.6rem 0.75rem; cursor: pointer; display: flex; flex-direction: column; gap: 0.3rem; }
.issue-row:hover { border-color: var(--primary); }
.issue-row.active { border-color: var(--primary); background: #2a3040; }
.issue-row-head { display: flex; align-items: center; justify-content: space-between; gap: 0.5rem; }
.issue-row-title { font-size: 0.92rem; font-weight: 600; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.issue-row-meta { font-size: 0.72rem; color: var(--muted); }
.issue-row-last { font-size: 0.78rem; color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.chat { display: flex; flex-direction: column; gap: 0.6rem; overflow-y: auto; flex: 1; min-height: 30vh; max-height: 52vh; padding-right: 0.25rem; }
.chat-msg { max-width: 85%; padding: 0.55rem 0.7rem; border-radius: 10px; display: flex; flex-direction: column; gap: 0.25rem; }
.chat-user { align-self: flex-end; background: #2b3a55; border: 1px solid var(--primary); }
.chat-agent { align-self: flex-start; background: var(--panel-2); border: 1px solid var(--border); }
.chat-meta { font-size: 0.7rem; color: var(--muted); display: flex; align-items: center; gap: 0.35rem; flex-wrap: wrap; }
.chat-body { font-size: 0.88rem; line-height: 1.45; white-space: pre-wrap; word-break: break-word; }
.chat-compose { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 0.5rem; align-items: end; }
.chat-compose textarea { background: var(--panel-2); border: 1px solid var(--border); border-radius: 8px; padding: 0.55rem 0.7rem; color: var(--text); font-size: 0.9rem; font-family: inherit; min-height: 3rem; resize: vertical; }
.agent-reply { border-top: 1px dashed var(--border); padding-top: 0.5rem; }
.agent-reply summary { cursor: pointer; color: var(--muted); font-size: 0.85rem; }
.agent-reply textarea { width: 100%; margin-top: 0.5rem; background: var(--panel-2); border: 1px solid var(--border); border-radius: 8px; padding: 0.55rem 0.7rem; color: var(--text); font-size: 0.9rem; font-family: inherit; min-height: 3rem; resize: vertical; }
.agent-row { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 0.5rem; margin-top: 0.5rem; }
.agent-row select { background: var(--panel-2); border: 1px solid var(--border); border-radius: 8px; padding: 0.55rem 0.7rem; color: var(--text); font-size: 0.9rem; font-family: inherit; min-width: 0; width: 100%; }

/* Tags */
.tag { display: inline-block; font-size: 0.7rem; padding: 0.15rem 0.5rem; border-radius: 999px; border: 1px solid var(--border); color: var(--muted); white-space: nowrap; }
.tag-user_submitted { color: var(--warn); border-color: var(--warn); }
.tag-wip { color: var(--primary); border-color: var(--primary); }
.tag-solved { color: var(--ok); border-color: var(--ok); }
.tag-submitted { color: var(--muted); }

@media (max-width: 900px) {
  .form-row, .flow-panels, .issues-layout { grid-template-columns: minmax(0, 1fr); }
  .tabs { flex-wrap: wrap; }
  .issues-layout .panel { min-height: 0; }
}

@media (max-width: 480px) {
  .stack { padding: 0.75rem; gap: 0.75rem; }
  .panel { padding: 0.9rem; }
  .topbar { padding: 0.6rem 0.75rem; gap: 0.5rem; }
  .topbar .app-title { font-size: 1.1rem; }
  .tab { padding: 0.4rem 0.6rem; font-size: 0.85rem; }
  .preview-actions { gap: 0.35rem; }
  .btn { padding: 0.5rem 0.7rem; font-size: 0.85rem; }
  .history-row { flex-direction: column; align-items: flex-start; gap: 0.5rem; }
  .overlay-color-label { font-size: 0.75rem; }
}