/* ═══════════════════════════════════════════════════════
   EU KNOWLEDGE BUILDER — Hub design system
   3-panel workspace: list | editor | preview
═══════════════════════════════════════════════════════ */

:root {
  --euk-bg: #f2f6fb;
  --euk-surface: #ffffff;
  --euk-surface-soft: #f8fafe;
  --euk-text: #0b1424;
  --euk-text-2: #26324a;
  --euk-muted: #4b5873;
  --euk-muted-2: #7a88a2;
  --euk-border: #d8e2f0;
  --euk-border-strong: #c0cedf;
  --euk-brand: #273e57;
  --euk-brand-mid: #1a2940;
  --euk-gold: #c6a354;
  --euk-ok: #0d7c3f;
  --euk-ok-bg: #e9f6ef;
  --euk-warn: #b45309;
  --euk-warn-bg: #fdf3e6;
  --euk-err: #b42318;
  --euk-err-bg: #fdecea;
  --euk-radius-sm: 6px;
  --euk-radius-md: 10px;
  --euk-radius-lg: 14px;
  --euk-radius-xl: 20px;
  --euk-radius-full: 999px;
  --euk-shadow-sm: 0 1px 3px rgba(11,20,36,.06), 0 1px 2px rgba(11,20,36,.04);
  --euk-shadow-md: 0 4px 12px rgba(11,20,36,.08), 0 2px 6px rgba(11,20,36,.05);
  --euk-shadow-lg: 0 16px 40px rgba(11,20,36,.1), 0 4px 14px rgba(11,20,36,.06);
  --euk-topbar-h: 52px;
  --euk-panel-list-w: 300px;
  --euk-panel-preview-w: 320px;
}

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

html, body {
  margin: 0;
  min-height: 100%;
  font-family: "Manrope", "Nunito Sans", "Source Sans Pro", Arial, sans-serif;
  font-size: 14px;
  color: var(--euk-text);
  background:
    radial-gradient(circle at 4% 0, rgba(39, 62, 87, .1) 0, transparent 50%),
    radial-gradient(circle at 96% 100%, rgba(198, 163, 84, .08) 0, transparent 48%),
    linear-gradient(180deg, #f5f9ff 0%, var(--euk-bg) 100%);
}

/* ── TOP BAR ─────────────────────────────────────── */
.euk-topbar {
  position: sticky;
  top: 0;
  z-index: 200;
  height: var(--euk-topbar-h);
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--euk-border);
  box-shadow: var(--euk-shadow-sm);
}

.euk-topbar-inner {
  display: flex;
  align-items: center;
  gap: 12px;
  height: 100%;
  padding: 0 20px;
}

.euk-brand {
  display: flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
  color: var(--euk-text);
}

.euk-brand-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--euk-brand);
}

.euk-brand-name strong { font-weight: 800; }
.euk-brand-sep { color: var(--euk-muted-2); font-weight: 300; }

.euk-brand-page {
  font-size: 13px;
  font-weight: 700;
  color: var(--euk-muted);
}

.euk-admin-badge {
  display: inline-flex;
  align-items: center;
  height: 22px;
  padding: 0 8px;
  border-radius: var(--euk-radius-full);
  background: rgba(198,163,84,.15);
  border: 1px solid rgba(198,163,84,.35);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: #8a6820;
}

.euk-topbar-spacer { flex: 1; }

.euk-topbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.euk-btn-back {
  display: inline-flex;
  align-items: center;
  height: 34px;
  padding: 0 14px;
  border-radius: var(--euk-radius-full);
  border: 1px solid var(--euk-border-strong);
  background: var(--euk-surface);
  color: var(--euk-text-2);
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
  transition: background .12s;
}

.euk-btn-back:hover { background: var(--euk-surface-soft); }

.euk-btn-logout {
  display: inline-flex;
  align-items: center;
  height: 34px;
  padding: 0 14px;
  border-radius: var(--euk-radius-full);
  border: 1px solid rgba(180,35,24,.3);
  background: rgba(180,35,24,.06);
  color: var(--euk-err);
  font-size: 13px;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  transition: background .12s;
}

.euk-btn-logout:hover { background: rgba(180,35,24,.12); }

/* ── WORKSPACE ───────────────────────────────────── */
.euk-workspace {
  display: grid;
  grid-template-columns: var(--euk-panel-list-w) 1fr var(--euk-panel-preview-w);
  height: calc(100vh - var(--euk-topbar-h));
  overflow: hidden;
}

/* ── PANELS ──────────────────────────────────────── */
.euk-panel {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--euk-surface);
}

.euk-panel + .euk-panel { border-left: 1px solid var(--euk-border); }

.euk-panel-header {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  height: 48px;
  padding: 0 16px;
  border-bottom: 1px solid var(--euk-border);
  background: var(--euk-surface-soft);
}

.euk-panel-title {
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--euk-brand);
}

.euk-count-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 20px;
  height: 20px;
  padding: 0 5px;
  border-radius: var(--euk-radius-full);
  background: rgba(39,62,87,.12);
  font-size: 11px;
  font-weight: 800;
  color: var(--euk-brand);
}

/* ── LEFT PANEL ──────────────────────────────────── */
.euk-panel-list { grid-column: 1; }

.euk-search-wrap {
  position: relative;
  flex-shrink: 0;
  padding: 10px 12px 8px;
  border-bottom: 1px solid var(--euk-border);
}

.euk-search-icon {
  position: absolute;
  left: 22px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--euk-muted-2);
  pointer-events: none;
}

.euk-search-input {
  width: 100%;
  height: 34px;
  padding: 0 10px 0 32px;
  border: 1px solid var(--euk-border-strong);
  border-radius: var(--euk-radius-full);
  background: var(--euk-surface);
  color: var(--euk-text);
  font: inherit;
  font-size: 13px;
}

.euk-search-input:focus {
  outline: none;
  border-color: var(--euk-brand);
  box-shadow: 0 0 0 2px rgba(39,62,87,.1);
}

.euk-filters-wrap {
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 8px 12px;
  border-bottom: 1px solid var(--euk-border);
}

.euk-filter-select {
  width: 100%;
  height: 30px;
  padding: 0 8px;
  border: 1px solid var(--euk-border-strong);
  border-radius: var(--euk-radius-md);
  background: var(--euk-surface);
  color: var(--euk-text-2);
  font: inherit;
  font-size: 12px;
}

.euk-filter-select:focus {
  outline: none;
  border-color: var(--euk-brand);
}

.euk-list-body {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

/* Question list items (rendered by JS) */
.euk-q-item {
  display: grid;
  gap: 3px;
  width: 100%;
  border: 1px solid var(--euk-border);
  border-radius: var(--euk-radius-md);
  padding: 8px 10px;
  background: var(--euk-surface);
  color: var(--euk-text);
  text-align: left;
  cursor: pointer;
  font: inherit;
  font-size: 12px;
  transition: border-color .12s, background .12s;
}

.euk-q-item:hover { border-color: var(--euk-brand); background: var(--euk-surface-soft); }
.euk-q-item.is-active { border-color: var(--euk-brand); background: rgba(39,62,87,.06); }

.euk-q-item-title {
  font-weight: 700;
  color: var(--euk-text-2);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.euk-q-item-meta {
  color: var(--euk-muted);
  font-size: 11px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.euk-q-item-chips {
  display: flex;
  gap: 4px;
  align-items: center;
  flex-wrap: wrap;
}

.euk-q-item-state {
  display: inline-flex;
  align-items: center;
  height: 17px;
  padding: 0 6px;
  border-radius: var(--euk-radius-full);
  font-size: 10px;
  font-weight: 800;
  background: rgba(39,62,87,.1);
  color: var(--euk-brand);
}

.euk-q-item-state[data-state="active"] { background: var(--euk-ok-bg); color: var(--euk-ok); }
.euk-q-item-state[data-state="review"] { background: var(--euk-warn-bg); color: var(--euk-warn); }
.euk-q-item-state[data-state="draft"] { background: rgba(39,62,87,.06); color: var(--euk-muted); }

.euk-q-item-cat {
  display: inline-flex;
  align-items: center;
  height: 17px;
  padding: 0 6px;
  border-radius: var(--euk-radius-full);
  font-size: 10px;
  font-weight: 700;
  background: rgba(198,163,84,.1);
  color: #8a6820;
  border: 1px solid rgba(198,163,84,.2);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 110px;
}

.euk-q-empty {
  border: 1px dashed var(--euk-border-strong);
  border-radius: var(--euk-radius-md);
  padding: 16px;
  text-align: center;
  color: var(--euk-muted);
  font-size: 12px;
  font-weight: 600;
}

.euk-panel-footer {
  flex-shrink: 0;
  padding: 12px;
  border-top: 1px solid var(--euk-border);
  display: grid;
  gap: 8px;
}

.euk-edit-current {
  margin: 0;
  font-size: 11px;
  font-weight: 700;
  color: var(--euk-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.euk-list-actions { display: flex; gap: 6px; }

/* ── CENTER PANEL ────────────────────────────────── */
.euk-panel-editor { grid-column: 2; }

.euk-panel-header-editor { justify-content: space-between; }

.euk-state-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

.euk-state-badge {
  display: inline-flex;
  align-items: center;
  height: 24px;
  padding: 0 10px;
  border-radius: var(--euk-radius-full);
  font-size: 11px;
  font-weight: 800;
  border: 1px solid rgba(39,62,87,.2);
  background: rgba(39,62,87,.06);
  color: var(--euk-muted);
  cursor: pointer;
  transition: background .12s;
}

.euk-state-badge[data-state="active"] {
  background: var(--euk-ok-bg);
  border-color: rgba(13,124,63,.2);
  color: var(--euk-ok);
}

.euk-state-badge[data-state="review"] {
  background: var(--euk-warn-bg);
  border-color: rgba(180,83,9,.2);
  color: var(--euk-warn);
}

.euk-state-badge[data-state="draft"] {
  background: rgba(39,62,87,.06);
  border-color: rgba(39,62,87,.14);
  color: var(--euk-muted);
}

.euk-editor-body {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

/* ── FIELDS ───────────────────────────────────────── */
.euk-field {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.euk-field-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.euk-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 700;
  color: var(--euk-text-2);
}

.euk-field-hint {
  font-size: 10px;
  font-weight: 600;
  color: var(--euk-muted-2);
}

.euk-option-letter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  border-radius: var(--euk-radius-sm);
  background: rgba(39,62,87,.1);
  font-size: 10px;
  font-weight: 800;
  color: var(--euk-brand);
}

.euk-input,
.euk-textarea,
.euk-select {
  width: 100%;
  border: 1px solid var(--euk-border-strong);
  border-radius: var(--euk-radius-md);
  padding: 8px 10px;
  background: var(--euk-surface);
  color: var(--euk-text);
  font: inherit;
  font-size: 13px;
  transition: border-color .12s, box-shadow .12s;
}

.euk-textarea { resize: vertical; line-height: 1.45; }
.euk-textarea-lg { min-height: 100px; }

.euk-input:focus,
.euk-textarea:focus,
.euk-select:focus {
  outline: none;
  border-color: var(--euk-brand);
  box-shadow: 0 0 0 2px rgba(39,62,87,.1);
}

.euk-options-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

/* ── EDITOR FOOTER ────────────────────────────────── */
.euk-editor-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding-top: 4px;
  border-top: 1px solid var(--euk-border);
  padding-top: 14px;
  margin-top: 2px;
}

.euk-editor-actions {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
  flex-wrap: wrap;
}

.euk-status {
  margin: 0;
  font-size: 12px;
  font-weight: 700;
  color: var(--euk-muted);
  flex: 1;
  min-height: 20px;
}

.euk-status[data-state="error"] { color: var(--euk-err); }
.euk-status[data-state="success"] { color: var(--euk-ok); }

/* ── BUTTONS ──────────────────────────────────────── */
.euk-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 34px;
  padding: 0 14px;
  border-radius: var(--euk-radius-full);
  border: 1px solid var(--euk-border-strong);
  background: var(--euk-surface);
  color: var(--euk-text-2);
  font: inherit;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition: background .12s, border-color .12s, opacity .12s;
  white-space: nowrap;
}

.euk-btn:disabled { opacity: .45; cursor: not-allowed; }

.euk-btn:hover:not(:disabled) {
  background: var(--euk-surface-soft);
}

.euk-btn-primary {
  background: var(--euk-brand);
  border-color: var(--euk-brand);
  color: #fff;
  box-shadow: 0 4px 12px rgba(39,62,87,.24);
}

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

.euk-btn-secondary {
  background: var(--euk-surface);
  border-color: var(--euk-border-strong);
  color: var(--euk-text-2);
}

.euk-btn-ghost {
  background: transparent;
  border-color: transparent;
  color: var(--euk-muted);
}

.euk-btn-ghost:hover:not(:disabled) {
  background: rgba(39,62,87,.07);
  border-color: transparent;
  color: var(--euk-text-2);
}

.euk-btn-danger {
  background: transparent;
  border-color: rgba(180,35,24,.3);
  color: var(--euk-err);
}

.euk-btn-danger:hover:not(:disabled) {
  background: var(--euk-err-bg);
}

.euk-btn-sm {
  height: 28px;
  padding: 0 10px;
  font-size: 12px;
}

.euk-btn-full { width: 100%; }

/* ── RIGHT PANEL ─────────────────────────────────── */
.euk-panel-preview { grid-column: 3; }

.euk-difficulty-chip {
  display: inline-flex;
  align-items: center;
  height: 22px;
  padding: 0 10px;
  border-radius: var(--euk-radius-full);
  border: 1px solid var(--euk-border);
  font-size: 11px;
  font-weight: 800;
  color: var(--euk-brand);
  background: rgba(39,62,87,.07);
}

.euk-preview-body {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.euk-preview-prompt {
  margin: 0;
  font-size: 15px;
  font-weight: 800;
  color: var(--euk-text);
  line-height: 1.4;
}

.euk-preview-passage {
  font-size: 13px;
  line-height: 1.6;
  color: var(--euk-text-2);
  border-left: 3px solid var(--euk-border-strong);
  padding-left: 12px;
}

.euk-preview-passage:empty { display: none; }

.euk-preview-passage p { margin: 0 0 8px; }
.euk-preview-passage p:last-child { margin-bottom: 0; }

.euk-preview-options {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.euk-preview-option {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--euk-border);
  border-radius: var(--euk-radius-md);
  background: var(--euk-surface-soft);
  font-size: 13px;
  line-height: 1.45;
}

.euk-preview-option.is-correct {
  border-color: rgba(13,124,63,.3);
  background: var(--euk-ok-bg);
}

.euk-preview-option-letter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  border-radius: var(--euk-radius-sm);
  background: rgba(39,62,87,.1);
  font-size: 11px;
  font-weight: 800;
  color: var(--euk-brand);
}

.euk-preview-option.is-correct .euk-preview-option-letter {
  background: rgba(13,124,63,.2);
  color: var(--euk-ok);
}

.euk-preview-option p { margin: 0; color: var(--euk-text-2); }

.euk-preview-answer-row {
  display: flex;
  align-items: center;
}

.euk-preview-answer {
  display: inline-flex;
  align-items: center;
  height: 26px;
  padding: 0 12px;
  border-radius: var(--euk-radius-full);
  background: var(--euk-ok-bg);
  border: 1px solid rgba(13,124,63,.2);
  font-size: 12px;
  font-weight: 800;
  color: var(--euk-ok);
}

.euk-explanation-title {
  margin: 0 0 4px;
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--euk-muted);
}

.euk-preview-explanation {
  margin: 0;
  font-size: 12px;
  line-height: 1.55;
  color: var(--euk-text-2);
}

/* ── SCROLLBAR ────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(39,62,87,.18); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(39,62,87,.3); }