/* ==========================================================================
   Trịnh Nhật Minh · MinhMix Exam Studio
   Editorial Academic Design System — Matched to sat.trinhnhatminh.id.vn
   ========================================================================== */

:root {
  --bg-canvas: #F7F8FA;
  --bg-surface: #FFFFFF;
  --bg-paper: #FDFCFB;
  --bg-subtle: #F1F4F8;
  --bg-hover: #F8FAFC;

  --border-hairline: #E3E7EE;
  --border-strong: #CBD5E1;
  --border-focus: #0B2948;

  --ink-primary: #0F172A;
  --ink-secondary: #475569;
  --ink-muted: #64748B;

  --navy: #0B2948;
  --navy-hover: #163B63;
  --navy-tint: #F0F4F8;

  --gold-crest: #FCD34D;
  --amber-bg: #FDF8E7;
  --amber-border: #FDE68A;
  --amber-ink: #78350F;

  --emerald: #047857;
  --emerald-bg: #ECFDF5;
  --emerald-border: #A7F3D0;

  --crimson: #BE123C;
  --crimson-bg: #FFF1F2;
  --crimson-border: #FECDD3;

  --font-sans: 'Be Vietnam Pro', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-serif: 'Lora', Georgia, Cambria, serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Consolas, monospace;

  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 10px;

  --shadow-card: 0 1px 2px rgba(15, 23, 42, 0.04);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

::selection {
  background: rgba(253, 230, 138, 0.65);
  color: var(--ink-primary);
}

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.55;
  color: var(--ink-primary);
  background-color: var(--bg-canvas);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.hidden {
  display: none !important;
}

.mt-6 { margin-top: 6px; }
.mt-12 { margin-top: 12px; }

.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ==========================================================================
   TOPBAR
   ========================================================================== */
.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  height: 64px;
  background-color: rgba(247, 248, 250, 0.94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-hairline);
}

.topbar-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  padding: 4px 0;
  font-family: inherit;
}

.brand-crest {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: var(--navy);
  color: var(--gold-crest);
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.04em;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background-color 150ms ease;
}

.brand:hover .brand-crest {
  background-color: var(--navy-hover);
}

.brand-meta {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.brand-title-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand-author {
  font-size: 14.5px;
  font-weight: 600;
  color: var(--ink-primary);
  letter-spacing: -0.01em;
}

.brand-tag {
  font-size: 10.5px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--navy);
  background-color: #EAECEF;
  padding: 2px 7px;
  border-radius: 4px;
}

.brand-sub {
  font-size: 12px;
  color: var(--ink-muted);
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.topbar-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 13px;
  font-weight: 500;
  color: var(--ink-secondary);
  text-decoration: none;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  transition: color 150ms ease, background-color 150ms ease;
}

.topbar-link:hover {
  color: var(--navy);
  background-color: var(--bg-subtle);
}

/* ==========================================================================
   BUTTONS
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  font-family: var(--font-sans);
  font-size: 13.5px;
  font-weight: 600;
  line-height: 1.2;
  padding: 9px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background-color 150ms ease, border-color 150ms ease, color 150ms ease;
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-primary {
  background-color: var(--navy);
  color: #FFFFFF;
  border-color: var(--navy);
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--navy-hover);
  border-color: var(--navy-hover);
}

.btn-secondary {
  background-color: var(--bg-surface);
  color: var(--ink-primary);
  border-color: var(--border-strong);
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--bg-subtle);
  border-color: #94A3B8;
}

.btn-ghost {
  background-color: transparent;
  color: var(--ink-secondary);
  border-color: var(--border-hairline);
}

.btn-ghost:hover:not(:disabled) {
  background-color: var(--bg-subtle);
  color: var(--ink-primary);
}

.btn-sm {
  font-size: 12.5px;
  padding: 6px 12px;
}

.btn-lg {
  font-size: 14px;
  padding: 11px 20px;
}

.btn-full {
  width: 100%;
}

/* ==========================================================================
   MAIN SHELL & ALERT BANNER
   ========================================================================== */
.main-shell {
  flex: 1;
  padding-top: 28px;
  padding-bottom: 48px;
}

.alert-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 11px 16px;
  margin-bottom: 20px;
  background-color: var(--crimson-bg);
  border: 1px solid var(--crimson-border);
  border-radius: var(--radius-md);
  color: var(--crimson);
  font-size: 13.5px;
}

.alert-inner {
  display: flex;
  align-items: center;
  gap: 10px;
}

.alert-indicator {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background-color: var(--crimson);
  color: #FFFFFF;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.alert-close {
  background: none;
  border: none;
  color: var(--crimson);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
  padding: 2px 6px;
}

/* ==========================================================================
   VIEW 1: ASYMMETRIC 12-COL INTAKE LAYOUT
   ========================================================================== */
.intake-grid {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: 28px;
  align-items: start;
}

.intake-heading {
  margin-bottom: 22px;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--navy);
  margin-bottom: 10px;
}

.editorial-title {
  font-family: var(--font-serif);
  font-size: 29px;
  font-weight: 600;
  line-height: 1.28;
  letter-spacing: -0.015em;
  color: var(--ink-primary);
  margin-bottom: 12px;
}

.editorial-lead {
  font-size: 14.5px;
  line-height: 1.68;
  color: var(--ink-secondary);
  max-width: 66ch;
}

/* Workbench Card */
.workbench-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.workbench-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding: 14px 20px;
  background-color: var(--bg-hover);
  border-bottom: 1px solid var(--border-hairline);
}

.seg-control {
  display: inline-flex;
  background-color: #EAECEF;
  padding: 3px;
  border-radius: var(--radius-sm);
}

.seg-btn {
  background: transparent;
  border: none;
  font-family: var(--font-sans);
  font-size: 12.5px;
  font-weight: 600;
  color: var(--ink-secondary);
  padding: 6px 13px;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 140ms ease, color 140ms ease;
}

.seg-btn:hover {
  color: var(--ink-primary);
}

.seg-btn.active {
  background-color: var(--bg-surface);
  color: var(--navy);
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.06);
}

.workbench-hint {
  font-size: 12px;
  color: var(--ink-muted);
}

.workbench-body {
  padding: 20px;
}

.dual-slots {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.file-slot {
  background-color: var(--bg-paper);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-md);
  padding: 18px;
  display: flex;
  flex-direction: column;
  cursor: pointer;
  transition: border-color 150ms ease, background-color 150ms ease;
}

.file-slot:hover,
.file-slot.dragover {
  border-color: var(--navy);
  background-color: var(--bg-surface);
}

.file-slot.has-file {
  border-style: solid;
  border-color: var(--emerald);
  background-color: #FAFFFD;
}

.slot-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 10px;
}

.slot-index {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--navy);
}

.slot-status {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-muted);
  background-color: var(--bg-subtle);
  padding: 2px 7px;
  border-radius: 4px;
}

.file-slot.has-file .slot-status {
  color: var(--emerald);
  background-color: var(--emerald-bg);
  font-weight: 600;
}

.slot-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink-primary);
  margin-bottom: 6px;
}

.slot-desc {
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--ink-secondary);
  margin-bottom: 16px;
  flex: 1;
  word-break: break-word;
}

.file-slot.has-file .slot-desc {
  color: var(--emerald);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
}

.slot-footer {
  margin-top: auto;
}

.workbench-submit {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border-hairline);
}

/* Single File Slot */
.single-slot {
  background-color: var(--bg-paper);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-md);
  padding: 36px 24px;
  text-align: center;
  cursor: pointer;
  transition: border-color 150ms ease, background-color 150ms ease;
}

.single-slot:hover,
.single-slot.dragover {
  border-color: var(--navy);
  background-color: var(--bg-surface);
}

.single-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background-color: var(--navy-tint);
  color: var(--navy);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
}

.single-desc {
  max-width: 52ch;
  margin: 6px auto 18px;
}

/* Right Column: Spec & Samples Archive */
.intake-aside {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.spec-card,
.archive-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 18px 20px;
}

.card-kicker {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.spec-list {
  list-style: none;
  margin-top: 14px;
  display: flex;
  flex-direction: column;
  gap: 13px;
}

.spec-list li {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 10px;
  align-items: start;
}

.spec-num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--navy);
  background-color: var(--navy-tint);
  border-radius: 4px;
  padding: 2px 0;
  text-align: center;
}

.spec-list strong {
  display: block;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--ink-primary);
  margin-bottom: 2px;
}

.spec-list p {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--ink-secondary);
}

/* Samples Archive List */
.archive-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.archive-sub {
  font-size: 11.5px;
  color: var(--ink-muted);
}

.samples-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--border-hairline);
}

.sample-card {
  width: 100%;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border-hairline);
  padding: 11px 4px;
  text-align: left;
  cursor: pointer;
  font-family: inherit;
  transition: background-color 140ms ease, padding-left 140ms ease;
}

.sample-card:last-child {
  border-bottom: none;
  padding-bottom: 2px;
}

.sample-card:hover {
  background-color: var(--bg-hover);
  padding-left: 8px;
}

.sample-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 3px;
}

.sample-title {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--ink-primary);
}

.sample-card:hover .sample-title {
  color: var(--navy);
}

.sample-badge {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--navy);
  background-color: var(--navy-tint);
  padding: 1px 6px;
  border-radius: 4px;
  flex-shrink: 0;
}

.sample-desc {
  font-size: 12px;
  color: var(--ink-muted);
}

/* ==========================================================================
   LOADING PANEL
   ========================================================================== */
.loading-panel {
  max-width: 520px;
  margin: 48px auto;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  display: flex;
  align-items: center;
  gap: 18px;
  box-shadow: var(--shadow-card);
}

.spinner {
  width: 26px;
  height: 26px;
  border: 2.5px solid var(--border-hairline);
  border-top-color: var(--navy);
  border-radius: 50%;
  animation: spin 0.75s linear infinite;
  flex-shrink: 0;
}

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

.loading-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink-primary);
  margin-bottom: 3px;
}

.loading-sub {
  font-size: 12.5px;
  color: var(--ink-muted);
}

/* ==========================================================================
   VIEW 2: WORKSPACE — DOCUMENT LEDGER & CALLOUTS
   ========================================================================== */
.workspace-shell {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.ledger-bar {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-lg);
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  box-shadow: var(--shadow-card);
}

.ledger-doc {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.doc-format-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--navy);
  background-color: var(--navy-tint);
  border: 1px solid #DCE4EE;
  padding: 6px 9px;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.ledger-titles {
  min-width: 0;
}

.ledger-title {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 600;
  color: var(--ink-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 620px;
}

.ledger-meta {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--ink-muted);
  margin-top: 2px;
}

.ledger-stats {
  display: flex;
  align-items: center;
}

.stat-cell {
  padding: 2px 18px;
  border-left: 1px solid var(--border-hairline);
  display: flex;
  flex-direction: column;
  align-items: flex-end;
}

.stat-cell:first-child {
  border-left: none;
}

.stat-label {
  font-size: 11.5px;
  color: var(--ink-muted);
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 600;
  color: var(--ink-primary);
  font-variant-numeric: tabular-nums;
}

.stat-cell.metric-success .stat-value {
  color: var(--emerald);
}

.stat-cell.metric-warn .stat-value {
  color: var(--crimson);
}

.callout-missing {
  background-color: var(--amber-bg);
  border: 1px solid var(--amber-border);
  border-radius: var(--radius-md);
  padding: 11px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  font-size: 13px;
  color: var(--amber-ink);
}

/* ==========================================================================
   RESULTS SHEET
   ========================================================================== */
.results-sheet {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-top: 3px solid var(--navy);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-card);
}

.results-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-hairline);
}

.results-title-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 4px;
}

.results-title-row h3 {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 600;
  color: var(--ink-primary);
}

.mono-pill {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  color: var(--emerald);
  background-color: var(--emerald-bg);
  border: 1px solid var(--emerald-border);
  padding: 2px 8px;
  border-radius: 4px;
}

.results-desc {
  font-size: 13px;
  color: var(--ink-secondary);
}

.results-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.results-files {
  padding: 14px 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
  border-bottom: 1px solid var(--border-hairline);
}

.file-row-group {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.file-group-label {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--ink-secondary);
  min-width: 195px;
}

.chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.dl-chip {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--navy);
  background-color: var(--bg-hover);
  border: 1px solid var(--border-strong);
  padding: 4px 10px;
  border-radius: 4px;
  text-decoration: none;
  transition: background-color 140ms ease, border-color 140ms ease;
}

.dl-chip:hover {
  background-color: var(--navy-tint);
  border-color: var(--navy);
}

.dl-chip.teacher-chip {
  color: var(--amber-ink);
  background-color: var(--amber-bg);
  border-color: var(--amber-border);
}

.dl-chip.teacher-chip:hover {
  border-color: #D97706;
}

/* Live Matrix Table */
.matrix-section {
  margin-top: 14px;
}

.matrix-tabbar {
  display: flex;
  gap: 16px;
  border-bottom: 1px solid var(--border-hairline);
  margin-bottom: 12px;
}

.matrix-tab {
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  padding: 6px 2px 9px;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-muted);
  cursor: pointer;
}

.matrix-tab.active {
  color: var(--navy);
  border-bottom-color: var(--navy);
}

.table-scroll {
  max-height: 280px;
  overflow: auto;
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-sm);
}

.matrix-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12.5px;
}

.matrix-table th,
.matrix-table td {
  padding: 7px 12px;
  border-bottom: 1px solid var(--border-hairline);
  border-right: 1px solid var(--border-hairline);
  text-align: center;
}

.matrix-table th {
  position: sticky;
  top: 0;
  background-color: var(--bg-subtle);
  color: var(--navy);
  font-family: var(--font-mono);
  font-weight: 600;
  z-index: 2;
}

.matrix-table td.ans-cell {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--emerald);
}

.writing-key-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 12px;
  max-height: 300px;
  overflow-y: auto;
}

.writing-code-card {
  background-color: var(--bg-paper);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
}

.writing-code-card h5 {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--navy);
  margin-bottom: 8px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border-hairline);
}

.writing-code-card ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 5px;
  font-size: 12.5px;
  color: var(--ink-secondary);
}

/* ==========================================================================
   TWO-COLUMN WORKSPACE (CONFIG RAIL + PAPER QUESTION INSPECTOR)
   ========================================================================== */
.workspace-columns {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  gap: 22px;
  align-items: start;
}

.config-rail {
  position: sticky;
  top: 80px;
}

.config-panel {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.panel-header {
  padding: 13px 18px;
  background-color: var(--bg-hover);
  border-bottom: 1px solid var(--border-hairline);
}

.panel-header h3 {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink-primary);
}

.cfg-section {
  padding: 15px 18px;
  border-bottom: 1px solid var(--border-hairline);
}

.cfg-section:last-child {
  border-bottom: none;
}

.section-caption {
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-muted);
  margin-bottom: 10px;
}

.field-block {
  margin-top: 11px;
}

.field-row-2col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: 12px;
}

.field-label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--ink-secondary);
  margin-bottom: 5px;
}

.field-input,
.field-select {
  width: 100%;
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--ink-primary);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 7px 10px;
  outline: none;
  transition: border-color 140ms ease;
}

.field-input:focus,
.field-select:focus {
  border-color: var(--navy);
}

.mono-input {
  font-family: var(--font-mono);
}

.preset-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 4px;
}

.pill-btn {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: 4px;
  padding: 5px 0;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--ink-secondary);
  cursor: pointer;
  transition: all 140ms ease;
}

.pill-btn:hover {
  border-color: var(--navy);
  color: var(--navy);
}

.pill-btn.active {
  background-color: var(--navy);
  border-color: var(--navy);
  color: #FFFFFF;
}

.check-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 12.8px;
  color: var(--ink-primary);
  cursor: pointer;
  padding: 4px 0;
}

.check-item input[type="checkbox"] {
  margin-top: 2.5px;
  accent-color: var(--navy);
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

.custom-hdr-fields {
  margin: 8px 0 6px;
  padding: 10px;
  background-color: var(--bg-hover);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

/* Password box */
.req-mark {
  color: var(--crimson);
}

.pwd-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.pwd-wrap .field-input {
  padding-right: 52px;
}

.pwd-toggle {
  position: absolute;
  right: 8px;
  background: none;
  border: none;
  font-family: var(--font-sans);
  font-size: 11.5px;
  font-weight: 600;
  color: var(--ink-muted);
  cursor: pointer;
  padding: 2px 4px;
}

.pwd-toggle:hover {
  color: var(--navy);
}

.pwd-hint {
  display: block;
  font-size: 11.5px;
  color: var(--ink-muted);
  margin-top: 5px;
}

.password-group.has-error .field-input {
  border-color: var(--crimson);
  background-color: var(--crimson-bg);
}

.password-group.has-error .pwd-hint {
  color: var(--crimson);
}

/* ==========================================================================
   INSPECTOR PANE (RIGHT SIDE)
   ========================================================================== */
.inspector-pane {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 0;
}

.inspector-bar {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-lg);
  padding: 10px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  box-shadow: var(--shadow-card);
}

.filter-group {
  display: inline-flex;
  background-color: var(--bg-subtle);
  padding: 3px;
  border-radius: var(--radius-sm);
}

.filter-btn {
  background: transparent;
  border: none;
  font-family: var(--font-sans);
  font-size: 12.5px;
  font-weight: 600;
  color: var(--ink-secondary);
  padding: 5px 11px;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 140ms ease, color 140ms ease;
}

.filter-btn.active {
  background-color: var(--bg-surface);
  color: var(--navy);
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.06);
}

.inspector-tools {
  display: flex;
  align-items: center;
  gap: 8px;
}

.search-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: 10px;
  color: var(--ink-muted);
  pointer-events: none;
}

.search-input {
  font-family: var(--font-sans);
  font-size: 12.5px;
  color: var(--ink-primary);
  background-color: var(--bg-hover);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 6px 10px 6px 30px;
  width: 210px;
  outline: none;
}

.search-input:focus {
  background-color: var(--bg-surface);
  border-color: var(--navy);
}

.inspector-guide {
  font-size: 12.5px;
  color: var(--ink-muted);
  padding: 0 4px;
}

.groups-stack {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* Group Card */
.group-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.group-card.excluded {
  opacity: 0.52;
}

.group-header {
  padding: 12px 18px;
  background-color: var(--bg-hover);
  border-bottom: 1px solid var(--border-hairline);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.group-header-left {
  display: flex;
  flex-direction: column;
  gap: 3px;
  cursor: pointer;
  min-width: 0;
}

.group-badge-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.group-idx {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--navy);
  background-color: var(--navy-tint);
  padding: 2px 7px;
  border-radius: 4px;
}

.group-type-tag {
  font-size: 12px;
  font-weight: 600;
  color: var(--ink-secondary);
}

.group-instr {
  font-size: 12.5px;
  color: var(--ink-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 580px;
}

.group-mode-select {
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 500;
  color: var(--ink-primary);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 5px 8px;
  outline: none;
  flex-shrink: 0;
}

.group-mode-select:focus {
  border-color: var(--navy);
}

.group-body {
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

/* Archival Paper Passage Box (SAT Studio Editorial Serif) */
.passage-box {
  background-color: var(--bg-paper);
  border: 1px solid var(--border-hairline);
  border-left: 3px solid var(--navy);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  font-family: var(--font-serif);
  font-size: 14.5px;
  line-height: 1.72;
  color: #1E293B;
}

.passage-box p + p {
  margin-top: 10px;
}

/* Question Card */
.q-card {
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  background-color: var(--bg-surface);
  transition: border-color 140ms ease;
}

.q-card:hover {
  border-color: #CBD5E1;
}

.q-card.missing-ans {
  border-color: var(--crimson-border);
  background-color: #FFFDFD;
}

.q-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.q-stem {
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink-primary);
}

.q-stem u,
.opt-text u,
.passage-box u {
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1.5px;
}

.q-num-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--navy);
  background-color: var(--navy-tint);
  padding: 2px 7px;
  border-radius: 4px;
  margin-right: 6px;
}

.q-num-tag.q-tag-error {
  color: #92400e;
  background-color: #fef3c7;
  border: 1px solid #fde68a;
}

.q-num-tag.q-tag-wordform {
  color: #065f46;
  background-color: #d1fae5;
  border: 1px solid #a7f3d0;
}

.q-num-tag.q-tag-verbform {
  color: #1e40af;
  background-color: #dbeafe;
  border: 1px solid #bfdbfe;
}

.q-num-tag.q-tag-rewrite {
  color: #6b21a8;
  background-color: #f3e8ff;
  border: 1px solid #e9d5ff;
}

.q-card.missing-ans .q-num-tag {
  color: var(--crimson);
  background-color: var(--crimson-bg);
}

.q-controls {
  display: flex;
  align-items: center;
  gap: 5px;
  flex-shrink: 0;
}

.q-btn-edit,
.lock-btn {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-radius: 4px;
  padding: 3px 8px;
  font-family: var(--font-sans);
  font-size: 11.5px;
  font-weight: 500;
  color: var(--ink-muted);
  cursor: pointer;
  transition: all 140ms ease;
}

.q-btn-edit:hover,
.lock-btn:hover {
  border-color: var(--border-strong);
  color: var(--ink-primary);
  background-color: var(--bg-hover);
}

.lock-btn.locked {
  background-color: var(--amber-bg);
  border-color: var(--amber-border);
  color: var(--amber-ink);
  font-weight: 600;
}

.q-sublines {
  margin: 0 0 10px 4px;
  padding: 8px 12px;
  background-color: var(--bg-paper);
  border-left: 2px solid var(--border-strong);
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--ink-secondary);
}

.q-clean-note {
  display: inline-block;
  margin-bottom: 10px;
  padding: 4px 10px;
  background-color: var(--amber-bg);
  border: 1px solid var(--amber-border);
  border-radius: 4px;
  font-size: 12px;
  color: var(--amber-ink);
}

/* SAT Bluebook-style MCQ Option Cards */
.q-options-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.opt-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  text-align: left;
  padding: 8px 11px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: 13.5px;
  color: var(--ink-primary);
  transition: border-color 140ms ease, background-color 140ms ease;
}

.opt-btn:hover {
  border-color: var(--navy);
  background-color: var(--bg-hover);
}

.opt-letter {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  color: var(--ink-secondary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.opt-btn.is-correct {
  background-color: var(--emerald-bg);
  border-color: var(--emerald);
}

.opt-btn.is-correct .opt-letter {
  background-color: var(--emerald);
  border-color: var(--emerald);
  color: #FFFFFF;
}

.opt-btn.is-correct .opt-text {
  font-weight: 600;
  color: #064E3B;
}

.opt-text {
  min-width: 0;
  word-break: break-word;
}

/* Writing Question Box */
.writing-box {
  background-color: var(--bg-paper);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.writing-prompt-line {
  font-family: var(--font-serif);
  font-size: 13.5px;
  color: var(--ink-secondary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.writing-ans-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.writing-ans-lbl {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  color: var(--emerald);
  flex-shrink: 0;
}

.writing-ans-input {
  flex: 1;
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--ink-primary);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: 4px;
  padding: 6px 10px;
  outline: none;
}

.writing-ans-input:focus {
  border-color: var(--navy);
}

/* Inline Question Edit Drawer */
.q-edit-panel {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--border-strong);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.q-edit-row label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--ink-secondary);
  margin-bottom: 4px;
}

.q-stem-textarea {
  width: 100%;
  min-height: 64px;
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--ink-primary);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  resize: vertical;
  outline: none;
}

.q-stem-textarea:focus {
  border-color: var(--navy);
}

.opt-edit-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.opt-edit-row {
  display: flex;
  align-items: center;
  gap: 6px;
}

.opt-edit-lbl {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--navy);
  width: 18px;
}

.opt-edit-input {
  flex: 1;
  font-family: var(--font-sans);
  font-size: 13px;
  border: 1px solid var(--border-strong);
  border-radius: 4px;
  padding: 6px 8px;
  outline: none;
}

.opt-edit-input:focus {
  border-color: var(--navy);
}

.q-edit-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
}

/* ==========================================================================
   SITE FOOTER
   ========================================================================== */
.site-footer {
  border-top: 1px solid var(--border-hairline);
  padding: 18px 0;
  background-color: var(--bg-canvas);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 12.5px;
  color: var(--ink-muted);
}

.footer-sep {
  color: var(--border-strong);
}

/* ==========================================================================
   RESPONSIVE BREAKPOINTS
   ========================================================================== */
@media (max-width: 1024px) {
  .intake-grid {
    grid-template-columns: 1fr;
  }

  .workspace-columns {
    grid-template-columns: 1fr;
  }

  .config-rail {
    position: static;
  }
}

@media (max-width: 680px) {
  .container {
    padding: 0 16px;
  }

  .brand-sub {
    display: none;
  }

  .editorial-title {
    font-size: 23px;
  }

  .dual-slots,
  .q-options-grid,
  .opt-edit-grid {
    grid-template-columns: 1fr;
  }

  .ledger-stats {
    width: 100%;
    justify-content: space-between;
    padding-top: 10px;
    border-top: 1px solid var(--border-hairline);
  }

  .stat-cell {
    padding: 0 10px;
    align-items: flex-start;
  }

  .stat-cell:first-child {
    padding-left: 0;
  }
}