/* =================================================================
   TVET Internal Exam Moderator — Monochrome
   Palette: pure black, white, and greys only
   ================================================================= */

/* ── CSS Variables ─────────────────────────────────────────────── */
:root {
  /* Surfaces */
  --bg:          #f4f4f4;
  --surface:     #ffffff;
  --surface-2:   #f0f0f0;
  --border:      #d0d0d0;
  --border-2:    #b8b8b8;

  /* Dark tokens */
  --dark:        #111111;
  --dark-2:      #222222;
  --dark-3:      #333333;

  /* Accent — black */
  --accent:      #111111;
  --accent-2:    #222222;

  /* Text on light */
  --ink:         #111111;
  --ink-2:       #222222;
  --ink-3:       #555555;
  --ink-4:       #888888;

  /* Text on dark */
  --on-dark:     #ffffff;
  --on-dark-dim: rgba(255,255,255,.65);
  --pastel-y:    #ffffff;
  --mint:        #cccccc;
  --coral:       #999999;

  /* Status — all greyscale */
  --pass-fg:     #111111;
  --pass-bg:     #e8e8e8;
  --revise-fg:   #333333;
  --revise-bg:   #d8d8d8;
  --reject-fg:   #111111;
  --reject-bg:   #c8c8c8;

  /* Sizing */
  --radius:      4px;
  --radius-lg:   8px;
  --shadow:      0 1px 3px rgba(0,0,0,.08), 0 2px 8px rgba(0,0,0,.05);
  --shadow-lg:   0 4px 20px rgba(0,0,0,.12), 0 1px 4px rgba(0,0,0,.07);
}

/* ── Reset ─────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

/* ── Base ──────────────────────────────────────────────────────── */
body {
  font-family: 'IBM Plex Sans', 'Inter', system-ui, sans-serif;
  background: var(--bg);
  color: var(--ink);
  min-height: 100vh;
  font-size: 13px;
  line-height: 1.65;
}

/* ── Typography ────────────────────────────────────────────────── */
h1, h2, h3, h4 {
  font-family: 'IBM Plex Sans', system-ui, sans-serif;
  font-weight: 600;
  line-height: 1.25;
}
.display  { font-size: 24px; color: var(--ink); letter-spacing: -.01em; font-weight: 700; }
.subtitle { font-size: 12.5px; color: var(--ink-3); margin-top: 4px; }
.mono     { font-family: 'IBM Plex Mono', 'Courier New', monospace; font-size: 11.5px; }

/* ── Layout ────────────────────────────────────────────────────── */
.layout { display: flex; min-height: 100vh; }

/* ── Sidebar ───────────────────────────────────────────────────── */
.sidebar {
  width: 224px; flex-shrink: 0;
  background: var(--dark);
  display: flex; flex-direction: column;
  position: sticky; top: 0; height: 100vh;
  overflow-y: auto;
}
.sb-brand {
  padding: 24px 20px 18px;
  border-bottom: 1px solid rgba(255,255,255,.1);
}
.sb-brand .crest {
  width: 34px; height: 34px;
  background: var(--dark-2);
  border: 1px solid rgba(255,255,255,.15);
  border-radius: 3px;
  display: flex; align-items: center; justify-content: center;
  color: #ffffff;
  font-size: 16px; font-weight: 700;
  letter-spacing: -.02em;
  margin-bottom: 10px;
  font-family: 'IBM Plex Mono', monospace;
}
.sb-brand h1 {
  font-size: 13px; font-weight: 600;
  color: var(--on-dark);
  letter-spacing: .01em;
  line-height: 1.3;
}
.sb-brand p { font-size: 10.5px; color: var(--on-dark-dim); margin-top: 2px; }

.sb-nav { padding: 12px 8px; flex: 1; }
.sb-section {
  font-size: 9.5px; font-weight: 600; letter-spacing: .12em;
  text-transform: uppercase; color: var(--on-dark-dim);
  padding: 10px 12px 5px;
}
.sb-item {
  display: flex; align-items: center; gap: 9px;
  padding: 8px 12px; border-radius: var(--radius);
  font-size: 12.5px; color: var(--on-dark-dim);
  cursor: pointer; transition: all .12s;
  margin-bottom: 1px;
}
.sb-item:hover { background: rgba(255,255,255,.07); color: var(--on-dark); }
.sb-item.active { background: rgba(255,255,255,.12); color: var(--on-dark); }
.sb-item.active .sb-icon { color: #ffffff; }
.sb-icon { font-size: 14px; width: 18px; text-align: center; flex-shrink: 0; opacity: .7; }
.sb-item.active .sb-icon { opacity: 1; }

.sb-footer {
  padding: 14px 20px;
  border-top: 1px solid rgba(255,255,255,.07);
  font-size: 10px; color: var(--on-dark-dim);
}

/* ── Main content ──────────────────────────────────────────────── */
.main {
  flex: 1; padding: 32px 36px;
  overflow-x: hidden;
  max-width: calc(100vw - 224px);
}

/* ── Page header ───────────────────────────────────────────────── */
.page-hdr { margin-bottom: 26px; }
.breadcrumb {
  font-size: 10.5px; color: var(--ink-4);
  margin-bottom: 7px;
  letter-spacing: .06em; text-transform: uppercase;
}

/* ── Step progress bar ─────────────────────────────────────────── */
.steps {
  display: flex; align-items: stretch;
  background: var(--dark); border-radius: var(--radius-lg);
  overflow: hidden; margin-bottom: 26px;
  box-shadow: var(--shadow-lg);
}
.step-item {
  flex: 1; display: flex; align-items: center; gap: 10px;
  padding: 13px 16px;
  border-right: 1px solid rgba(255,255,255,.07);
  cursor: pointer; transition: background .12s;
  position: relative;
}
.step-item:last-child { border-right: none; }
.step-item:hover:not(.s-active):not(.s-done) { background: rgba(255,255,255,.04); }
.step-item.s-active { background: rgba(255,255,255,.1); }
.step-item.s-done   { opacity: .65; }

.step-num {
  width: 22px; height: 22px; border-radius: 50%;
  background: rgba(255,255,255,.15);
  color: var(--on-dark);
  font-size: 11px; font-weight: 600;
  font-family: 'IBM Plex Mono', 'Courier New', monospace;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.s-active .step-num { background: #ffffff; color: #111111; }
.s-done   .step-num { background: rgba(255,255,255,.4); color: #111111; }

.step-label {
  font-size: 12px; color: var(--on-dark-dim);
  line-height: 1.3;
}
.s-active .step-label { color: #ffffff; font-weight: 600; }
.s-done   .step-label { color: rgba(255,255,255,.55); }

/* ── Cards ─────────────────────────────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px 26px;
  box-shadow: var(--shadow);
  margin-bottom: 16px;
}
.card-hdr {
  font-size: 10.5px; font-weight: 700;
  text-transform: uppercase; letter-spacing: .09em;
  color: var(--ink-3);
  padding-bottom: 13px; margin-bottom: 16px;
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: 8px;
}
.card-hdr-accent {
  width: 3px; height: 12px;
  background: var(--ink);
  border-radius: 2px; display: inline-block;
}

/* Dark card */
.card-dark {
  background: var(--dark-2);
  color: var(--on-dark);
  border: 1px solid rgba(255,255,255,.08);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  box-shadow: var(--shadow-lg);
}
.card-dark label,
.card-dark .card-hdr { color: var(--on-dark-dim); }

/* ── Form elements ─────────────────────────────────────────────── */
label {
  display: block;
  font-size: 11px; font-weight: 600;
  letter-spacing: .05em; text-transform: uppercase;
  color: var(--ink-3); margin-bottom: 5px;
}
select, input[type="text"], textarea {
  width: 100%; padding: 9px 12px;
  border: 1.5px solid var(--border-2);
  border-radius: var(--radius);
  font-family: 'IBM Plex Sans', system-ui, sans-serif;
  font-size: 13px; color: var(--ink);
  background: var(--surface-2); outline: none;
  transition: border-color .12s, box-shadow .12s;
  -webkit-appearance: none; appearance: none;
}
select:focus, input[type="text"]:focus, textarea:focus {
  border-color: var(--ink);
  box-shadow: 0 0 0 3px rgba(0,0,0,.08);
  background: var(--surface);
}
select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%23888888' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 32px;
}
select:disabled { opacity: .5; cursor: not-allowed; }
textarea { resize: vertical; min-height: 180px; line-height: 1.7; font-size: 13px; }

.form-grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group  { margin-bottom: 14px; }

/* ── Buttons ───────────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 9px 20px; border-radius: var(--radius);
  font-family: 'IBM Plex Sans', system-ui, sans-serif;
  font-size: 13px; font-weight: 600;
  cursor: pointer; border: none; transition: all .12s;
  letter-spacing: .01em;
}
.btn-primary {
  background: var(--dark); color: var(--on-dark);
  box-shadow: 0 2px 6px rgba(0,0,0,.2);
}
.btn-primary:hover {
  background: #000000; color: #ffffff;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0,0,0,.28);
}
.btn-primary:disabled { opacity: .45; cursor: not-allowed; transform: none; }

.btn-ghost {
  background: transparent; color: var(--ink-2);
  border: 1.5px solid var(--border-2);
}
.btn-ghost:hover {
  border-color: var(--ink);
  color: var(--ink);
  background: rgba(0,0,0,.03);
}

.btn-action {
  background: var(--dark-2); color: var(--on-dark);
}
.btn-action:hover { background: var(--dark); }

.btn-row {
  display: flex; gap: 10px;
  justify-content: flex-end; margin-top: 6px;
}

/* ── Upload / drop zone ────────────────────────────────────────── */
.drop-zone {
  border: 2px dashed var(--border-2);
  border-radius: var(--radius-lg);
  padding: 36px 24px;
  text-align: center; cursor: pointer;
  transition: all .16s; background: var(--surface-2);
  position: relative;
}
.drop-zone:hover, .drop-zone.drag-over {
  border-color: var(--ink);
  background: rgba(0,0,0,.03);
}
.drop-zone input[type="file"] {
  position: absolute; inset: 0; opacity: 0;
  cursor: pointer; width: 100%; height: 100%;
}
.drop-icon { font-size: 28px; display: block; margin-bottom: 8px; filter: grayscale(1); }
.drop-zone h3 { font-size: 14px; font-weight: 600; color: var(--ink-2); margin-bottom: 4px; }
.drop-zone p  { font-size: 12px; color: var(--ink-4); }
.drop-chosen  { font-size: 12px; color: var(--ink); font-weight: 600; margin-top: 10px; }

/* ── Input mode tabs ───────────────────────────────────────────── */
.mode-tabs {
  display: flex; gap: 0;
  border: 1.5px solid var(--border-2);
  border-radius: var(--radius);
  overflow: hidden; margin-bottom: 16px; width: fit-content;
}
.mode-tab {
  padding: 6px 18px;
  font-family: 'IBM Plex Sans', system-ui, sans-serif;
  font-size: 12px; font-weight: 600;
  cursor: pointer; background: var(--surface-2);
  color: var(--ink-3); border: none; transition: all .1s;
}
.mode-tab:first-child { border-right: 1.5px solid var(--border-2); }
.mode-tab.mt-active   { background: var(--dark); color: var(--on-dark); }

/* ── Unit list ─────────────────────────────────────────────────── */
.unit-list { display: flex; flex-direction: column; gap: 7px; }
.unit-row {
  display: flex; align-items: flex-start; gap: 11px;
  padding: 10px 13px;
  border: 1.5px solid var(--border-2);
  border-radius: var(--radius);
  background: var(--surface-2); cursor: pointer; transition: all .1s;
}
.unit-row.u-selected {
  border-color: var(--ink);
  background: rgba(0,0,0,.03);
}
.unit-row input[type="checkbox"] {
  margin-top: 3px;
  accent-color: var(--ink);
  flex-shrink: 0;
}
.unit-code {
  font-family: 'IBM Plex Mono', 'Courier New', monospace;
  font-size: 11.5px; font-weight: 700;
  color: var(--ink);
  background: var(--surface);
  border: 1.5px solid var(--border-2);
  border-radius: 3px;
  padding: 1px 6px;
  display: inline-block;
  letter-spacing: .03em;
}
.unit-title { font-size: 13px; font-weight: 600; color: var(--ink); }
.unit-meta  { font-size: 11px; color: var(--ink-3); margin-top: 1px; }

/* ── Loader overlay ────────────────────────────────────────────── */
.loader {
  display: none; position: fixed; inset: 0;
  background: rgba(0,0,0,.7);
  backdrop-filter: blur(3px);
  z-index: 2000;
  align-items: center; justify-content: center;
  flex-direction: column; gap: 14px;
}
.loader.on { display: flex; }
.spin {
  width: 38px; height: 38px;
  border: 2px solid rgba(255,255,255,.15);
  border-top-color: #ffffff;
  border-radius: 50%;
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loader-msg { color: #ffffff; font-size: 13px; }

/* ── Results — verdict banner ──────────────────────────────────── */
.verdict-banner {
  border-radius: var(--radius-lg); padding: 20px 24px;
  display: flex; align-items: center;
  justify-content: space-between;
  flex-wrap: wrap; gap: 16px;
  margin-bottom: 16px;
  color: var(--on-dark);
  background: var(--dark);
  border: 1px solid rgba(255,255,255,.06);
}
.verdict-banner.PASS   { background: var(--dark); }
.verdict-banner.REVISE { background: var(--dark-2); }
.verdict-banner.REJECT { background: var(--dark-3); }

.verdict-pill {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 5px 16px; border-radius: 100px;
  font-size: 13px; font-weight: 700; letter-spacing: .06em;
  border: 1.5px solid rgba(255,255,255,.3);
}
.PASS   .verdict-pill { background: rgba(255,255,255,.12); color: #ffffff; border-color: rgba(255,255,255,.25); }
.REVISE .verdict-pill { background: rgba(255,255,255,.1);  color: #ffffff; border-color: rgba(255,255,255,.2); }
.REJECT .verdict-pill { background: rgba(255,255,255,.08); color: #ffffff; border-color: rgba(255,255,255,.15); }

.verdict-msg {
  font-size: 13px; color: rgba(255,255,255,.75);
  margin-top: 3px;
  max-width: 480px;
}
.verdict-pct {
  font-family: 'IBM Plex Mono', 'Courier New', monospace;
  font-size: 44px; color: #ffffff; line-height: 1; font-weight: 300;
}
.verdict-pct span { font-size: 18px; color: rgba(255,255,255,.6); }

/* ── Stats grid ────────────────────────────────────────────────── */
.stats-row {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 12px; margin-bottom: 16px;
}
.stat-tile {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 14px 16px;
}
.stat-num {
  font-family: 'IBM Plex Mono', 'Courier New', monospace;
  font-size: 32px; line-height: 1; font-weight: 300;
}
.stat-label {
  font-size: 10.5px; color: var(--ink-3);
  margin-top: 3px;
  text-transform: uppercase; letter-spacing: .06em;
}
.st-total .stat-num { color: var(--ink); }
.st-pass  .stat-num { color: #111111; }
.st-rev   .stat-num { color: #444444; }
.st-rej   .stat-num { color: #777777; }

/* Progress bar */
.pbar-wrap {
  height: 3px; background: var(--border);
  border-radius: 100px; margin-top: 8px; overflow: hidden;
}
.pbar {
  height: 100%; border-radius: 100px; transition: width .5s ease;
}
.pbar-pass   { background: #111111; }
.pbar-revise { background: #666666; }
.pbar-reject { background: #aaaaaa; }

/* ── Result tabs ───────────────────────────────────────────────── */
.r-tabs {
  display: flex; gap: 0;
  border-bottom: 1.5px solid var(--border);
  margin-bottom: 18px;
}
.r-tab {
  padding: 8px 18px; font-size: 12px; font-weight: 600;
  color: var(--ink-3); cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px; transition: all .1s;
  font-family: 'IBM Plex Sans', system-ui, sans-serif;
}
.r-tab:hover      { color: var(--ink); }
.r-tab.rt-active  { color: var(--ink); border-bottom-color: var(--ink); }
.r-pane           { display: none; }
.r-pane.rt-show   { display: block; }

/* ── Question rows ─────────────────────────────────────────────── */
.q-row {
  border: 1.5px solid var(--border);
  border-radius: var(--radius-lg);
  margin-bottom: 8px; overflow: hidden; transition: box-shadow .12s;
}
.q-row:hover { box-shadow: var(--shadow-lg); }

.q-head {
  display: flex; align-items: center; gap: 10px;
  padding: 11px 14px; cursor: pointer;
  background: var(--surface); transition: background .08s;
  flex-wrap: wrap;
}
.q-head:hover { background: var(--surface-2); }

.q-badge {
  width: 26px; height: 26px; border-radius: var(--radius);
  background: var(--dark); color: var(--on-dark);
  font-size: 11.5px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  font-family: 'IBM Plex Mono', 'Courier New', monospace;
}

.q-text { flex: 1; font-size: 13px; color: var(--ink-2); line-height: 1.5; }

.tag {
  font-size: 10px; font-weight: 700;
  padding: 2px 9px; border-radius: 3px;
  letter-spacing: .04em; white-space: nowrap;
}
.t-bloom  { background: var(--surface-2); color: var(--ink-3); border: 1px solid var(--border); }
.t-marks  { background: var(--dark); color: var(--on-dark); }
.t-PASS   { background: #e0e0e0; color: #111111; border: 1px solid #c0c0c0; }
.t-REVISE { background: #d0d0d0; color: #222222; border: 1px solid #b0b0b0; }
.t-REJECT { background: #bbbbbb; color: #111111; border: 1px solid #999999; }

.q-score-txt { font-family: 'IBM Plex Mono', monospace; font-size: 11px; color: var(--ink-4); white-space: nowrap; }
.q-chevron   { font-size: 11px; color: var(--ink-4); transition: transform .14s; flex-shrink: 0; }
.q-row.q-open .q-chevron { transform: rotate(180deg); }

.q-body {
  display: none; padding: 13px 14px 15px;
  background: var(--surface-2);
  border-top: 1px solid var(--border);
}
.q-row.q-open .q-body { display: block; }

/* Check chips */
.checks-wrap {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(175px, 1fr));
  gap: 7px; margin-bottom: 12px;
}
.check-chip {
  display: flex; align-items: flex-start; gap: 7px;
  padding: 7px 10px; border-radius: var(--radius);
  font-size: 12px; line-height: 1.4;
}
.ch-pass { background: #e8e8e8; color: #111111; border: 1px solid #cccccc; }
.ch-fail { background: #cccccc; color: #111111; border: 1px solid #aaaaaa; }
.ch-icon { font-size: 12px; flex-shrink: 0; margin-top: 1px; }

.feedback-strip {
  background: var(--dark); color: var(--on-dark);
  border-radius: var(--radius); padding: 10px 14px;
  font-size: 12.5px; line-height: 1.6;
}
.feedback-strip strong { color: #ffffff; font-weight: 700; }

.match-note { font-size: 11px; color: var(--ink-4); margin-top: 8px; }

/* ── Warnings ──────────────────────────────────────────────────── */
.warn-stack { display: flex; flex-direction: column; gap: 8px; }
.warn-row {
  display: flex; align-items: flex-start; gap: 10px;
  padding: 10px 13px; border-radius: var(--radius);
  font-size: 12.5px; line-height: 1.55;
}
.w-gap  { background: #cccccc; color: #111111; border: 1px solid #b0b0b0; }
.w-bal  { background: #d8d8d8; color: #222222; border: 1px solid #bbbbbb; }
.w-prog { background: var(--surface-2); color: var(--ink-2); border: 1px solid var(--border); }
.w-none { color: var(--ink-3); font-size: 13px; padding: 16px 0; }

/* ── Registry table ────────────────────────────────────────────── */
.reg-table { width: 100%; border-collapse: collapse; }
.reg-table th {
  font-size: 10px; font-weight: 700;
  text-transform: uppercase; letter-spacing: .08em;
  color: var(--ink-3); text-align: left;
  padding: 7px 12px;
  border-bottom: 2px solid var(--ink);
  background: var(--surface-2);
}
.reg-table td {
  padding: 9px 12px;
  border-bottom: 1px solid var(--border);
  font-size: 13px; color: var(--ink-2); vertical-align: middle;
}
.reg-table tr:hover td { background: var(--surface-2); }

.lv-badge {
  font-size: 10px; font-weight: 700;
  padding: 2px 9px; border-radius: 3px; letter-spacing: .05em;
  border: 1.5px solid currentColor;
}
.lv-3 { background: #f0f0f0; color: #111111; border-color: #888888; }
.lv-4 { background: #dddddd; color: #111111; border-color: #888888; }
.lv-5 { background: #cccccc; color: #111111; border-color: #777777; }

/* ── Toast ─────────────────────────────────────────────────────── */
.toast {
  position: fixed; bottom: 20px; right: 20px; z-index: 3000;
  background: var(--dark); color: var(--on-dark);
  padding: 10px 18px; border-radius: var(--radius);
  font-size: 12.5px;
  box-shadow: var(--shadow-lg);
  opacity: 0; transform: translateY(6px);
  transition: all .2s; pointer-events: none;
}
.toast.show { opacity: 1; transform: translateY(0); }

/* ── Panels ────────────────────────────────────────────────────── */
.panel        { display: none; }
.panel.active { display: block; }

/* ── Animations ────────────────────────────────────────────────── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}
.fade-up { animation: fadeUp .24s ease both; }

/* ── Responsive ────────────────────────────────────────────────── */
@media (max-width: 860px) {
  .sidebar    { display: none; }
  .main       { max-width: 100vw; padding: 16px 14px; }
  .stats-row  { grid-template-columns: repeat(2, 1fr); }
  .form-grid-2 { grid-template-columns: 1fr; }
  .steps      { flex-direction: column; }
}