/* ── CSS variables ─────────────────────────────────── */
:root {
  --sidebar-w: 250px;
  --topbar-h: 58px;
  --sidebar-bg: #0b3d52;
  --sidebar-text: #c8e6f0;
  --sidebar-muted: #7fb3c8;
  --sidebar-active-bg: #0e7490;
  --sidebar-hover-bg: rgba(255,255,255,0.07);
  --bg: #f0f5f8;
  --panel: #ffffff;
  --text: #0f2029;
  --muted: #5a707a;
  --primary: #0e7490;
  --primary-deep: #0b4f63;
  --accent: #f59e0b;
  --line: #d8eaf0;
  --ok: #0f8b5f;
  --bad: #b3261e;
  --warn: #d97706;
  --purple: #7c3aed;
  --radius: 10px;
  --shadow: 0 2px 8px rgba(0,0,0,0.07);
}

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

html, body {
  height: 100%;
  font-family: "Segoe UI", "Noto Sans", Tahoma, sans-serif;
  font-size: 14px;
  color: var(--text);
  background: var(--bg);
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Admin shell: sidebar + main ─────────────────── */
.admin-shell {
  display: flex;
  min-height: 100vh;
}

/* ── Sidebar ─────────────────────────────────────── */
.sidebar {
  width: var(--sidebar-w);
  background: var(--sidebar-bg);
  color: var(--sidebar-text);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 100;
  transition: transform 0.25s ease;
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 1.1rem 1.2rem;
  font-size: 0.95rem;
  font-weight: 700;
  color: #fff;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-nav {
  flex: 1;
  padding: 0.75rem 0.6rem;
  display: flex;
  flex-direction: column;
  gap: 2px;
  overflow-y: auto;
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.6rem 0.75rem;
  border-radius: 7px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--sidebar-text);
  text-decoration: none;
  transition: background 0.15s, color 0.15s;
}

.sidebar-link:hover {
  background: var(--sidebar-hover-bg);
  color: #fff;
  text-decoration: none;
}

.sidebar-link.active {
  background: var(--sidebar-active-bg);
  color: #fff;
  font-weight: 600;
}

.sidebar-footer {
  padding: 0.85rem 1rem;
  border-top: 1px solid rgba(255,255,255,0.1);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.sidebar-user {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  color: var(--sidebar-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sidebar-logout {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: none;
  border: none;
  color: var(--sidebar-muted);
  cursor: pointer;
  font-size: 0.8rem;
  padding: 0.3rem 0;
  transition: color 0.15s;
}

.sidebar-logout:hover { color: var(--bad); }

/* ── Main wrapper ────────────────────────────────── */
.main-wrap {
  margin-left: var(--sidebar-w);
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ── Topbar ──────────────────────────────────────── */
.topbar {
  height: var(--topbar-h);
  background: var(--panel);
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0 1.5rem;
  position: sticky;
  top: 0;
  z-index: 50;
}

.hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--muted);
  padding: 0.25rem;
}

.page-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  flex: 1;
}

.topbar-right { display: flex; align-items: center; gap: 0.75rem; }

.badge-admin {
  background: var(--primary);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* ── Content ─────────────────────────────────────── */
.content {
  flex: 1;
  padding: 1.5rem;
}

/* ── Cards ───────────────────────────────────────── */
.card {
  background: var(--panel);
  border-radius: var(--radius);
  border: 1px solid var(--line);
  padding: 1.25rem 1.5rem;
  box-shadow: var(--shadow);
  margin-bottom: 1.25rem;
}

.card-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.card-subtitle {
  font-size: 0.82rem;
  color: var(--muted);
  margin-bottom: 1rem;
}

/* ── Stat grid ───────────────────────────────────── */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.stat-card {
  background: var(--panel);
  border-radius: var(--radius);
  border: 1px solid var(--line);
  padding: 1.2rem 1.4rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  box-shadow: var(--shadow);
}

.stat-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.stat-icon-blue   { background: #e0f2fe; color: #0369a1; }
.stat-icon-teal   { background: #ccfbf1; color: var(--primary); }
.stat-icon-amber  { background: #fef3c7; color: var(--warn); }
.stat-icon-green  { background: #d1fae5; color: var(--ok); }

.stat-label {
  font-size: 0.75rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
}

.stat-value {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text);
  line-height: 1.1;
}

/* ── Chart layout ────────────────────────────────── */
.chart-row {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.chart-card { margin-bottom: 0; }
.chart-card-wide { flex: 2; }
.chart-col { flex: 1; display: flex; flex-direction: column; gap: 1rem; }

.chart-wrap {
  position: relative;
  height: 240px;
}

.chart-wrap-sm {
  height: 140px;
}

.chart-legend {
  margin-top: 0.6rem;
  font-size: 0.75rem;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  align-items: center;
}

.leg-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  margin-right: 2px;
}

/* ── Tables ──────────────────────────────────────── */
.table-wrap { overflow-x: auto; }

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
}

.data-table thead th {
  text-align: left;
  padding: 0.6rem 0.75rem;
  background: #f5f9fb;
  color: var(--muted);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  border-bottom: 2px solid var(--line);
  white-space: nowrap;
}

.data-table tbody td {
  padding: 0.55rem 0.75rem;
  border-bottom: 1px solid #eef3f6;
  vertical-align: middle;
}

.data-table tbody tr:hover { background: #f5fbfe; }
.data-table tbody tr.row-selected { background: #e0f2fe; }
.data-table tbody tr:last-child td { border-bottom: none; }

/* ── Badges ──────────────────────────────────────── */
.badge-cat {
  display: inline-block;
  background: #e0f2fe;
  color: var(--primary-deep);
  border-radius: 4px;
  padding: 0.15rem 0.45rem;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: capitalize;
}

.badge-diff {
  display: inline-block;
  border-radius: 4px;
  padding: 0.15rem 0.45rem;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: capitalize;
}

.badge-diff-easy   { background: #d1fae5; color: var(--ok); }
.badge-diff-medium { background: #fef3c7; color: var(--warn); }
.badge-diff-hard   { background: #fee2e2; color: var(--bad); }

.badge-type {
  display: inline-block;
  border-radius: 4px;
  padding: 0.15rem 0.45rem;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: capitalize;
  white-space: nowrap;
}

.badge-type-mcq        { background: #e0f2fe; color: #0369a1; }
.badge-type-true_false { background: #ede9fe; color: var(--purple); }
.badge-type-fill_blank { background: #d1fae5; color: var(--ok); }

/* ── Misc table cells ────────────────────────────── */
.muted-cell   { color: var(--muted); font-size: 0.78rem; }
.muted-text   { color: var(--muted); }
.center-cell  { text-align: center; }
.mono-cell    { font-family: "Consolas", monospace; font-size: 0.78rem; color: var(--muted); }
.q-text       { max-width: 300px; }
.q-answer     { max-width: 140px; font-size: 0.8rem; }

.score-pill {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  border-radius: 999px;
  padding: 0.1rem 0.5rem;
  font-size: 0.75rem;
  font-weight: 700;
}

.rank-gold   { font-size: 1.1rem; }
.rank-silver { font-size: 1.1rem; }
.rank-bronze { font-size: 1.1rem; }
.rank-num    { color: var(--muted); font-size: 0.8rem; }
.rank-cell   { text-align: center; width: 40px; }

/* ── Filter bar ──────────────────────────────────── */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.85rem 1.1rem;
  margin-bottom: 1rem;
  box-shadow: var(--shadow);
}

.filter-select {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.42rem 0.7rem;
  font-size: 0.82rem;
  background: var(--bg);
  color: var(--text);
  min-width: 140px;
}

.filter-count {
  margin-left: auto;
  font-size: 0.8rem;
  color: var(--muted);
}

/* ── Pagination ──────────────────────────────────── */
.pagination {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  align-items: center;
  padding: 1rem 0 0;
  border-top: 1px solid var(--line);
  margin-top: 0.75rem;
}

.page-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 34px;
  height: 34px;
  padding: 0 0.5rem;
  border-radius: 6px;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--primary);
  border: 1px solid var(--line);
  background: var(--panel);
  text-decoration: none;
  transition: background 0.12s, color 0.12s;
}

.page-btn:hover { background: #e0f2fe; text-decoration: none; }
.page-btn-active { background: var(--primary); color: #fff; border-color: var(--primary-deep); }
.page-btn-active:hover { background: var(--primary-deep); color: #fff; }
.page-info { margin-left: auto; font-size: 0.78rem; color: var(--muted); }

/* ── Buttons ─────────────────────────────────────── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.5rem 1.1rem;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 7px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s;
}
.btn-primary:hover { background: var(--primary-deep); color: #fff; text-decoration: none; }
.btn-primary.btn-sm { padding: 0.3rem 0.7rem; font-size: 0.78rem; }
.btn-primary.btn-block { width: 100%; justify-content: center; margin-top: 0.5rem; }

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.4rem 0.85rem;
  background: transparent;
  color: var(--primary);
  border: 1px solid var(--line);
  border-radius: 7px;
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.12s, border-color 0.12s;
}
.btn-ghost:hover { background: #e0f2fe; text-decoration: none; }
.btn-ghost.btn-sm { padding: 0.25rem 0.6rem; font-size: 0.76rem; }

/* ── Forms ───────────────────────────────────────── */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  margin-bottom: 1rem;
}

.form-group label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--muted);
}

.form-input {
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 0.48rem 0.75rem;
  font-size: 0.85rem;
  background: var(--bg);
  color: var(--text);
  width: 100%;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.form-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(14,116,144,0.12);
  background: #fff;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.req { color: var(--bad); }

/* ── Leaderboard tabs ────────────────────────────── */
.lb-tabs {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--line);
}

.lb-tab {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.38rem 0.75rem;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--muted);
  text-decoration: none;
  border: 1px solid transparent;
  transition: background 0.15s, color 0.15s;
}

.lb-tab:hover { background: #e0f2fe; color: var(--primary-deep); text-decoration: none; }
.lb-tab-active { background: var(--primary); color: #fff; font-weight: 600; border-color: var(--primary-deep); }
.lb-tab-active:hover { background: var(--primary-deep); color: #fff; }

.lb-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.2rem;
  height: 1.2rem;
  padding: 0 0.28rem;
  border-radius: 999px;
  font-size: 0.66rem;
  font-weight: 700;
  background: var(--primary);
  color: #fff;
  flex-shrink: 0;
}

.lb-tab-active .lb-chip { background: rgba(255,255,255,0.28); }

/* ── Categories grid ─────────────────────────────── */
.cat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

.cat-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.2rem 1.4rem;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.cat-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.3rem;
}

.cat-slug {
  font-family: "Consolas", monospace;
  font-size: 0.72rem;
  color: var(--muted);
  background: var(--bg);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
}

.cat-count {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--primary);
}

.cat-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
}

.cat-desc {
  font-size: 0.8rem;
  color: var(--muted);
  flex: 1;
}

.cat-actions { margin-top: 0.5rem; }

/* ── Quiz form layout ────────────────────────────── */
.two-col-layout {
  display: grid;
  grid-template-columns: minmax(340px, 1.2fr) 1fr;
  gap: 1.25rem;
  align-items: start;
}

.success-card { border-color: #a7f3d0; background: #f0fdf4; }
.success-header {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 1rem;
}
.success-header h3 { font-size: 1rem; font-weight: 700; color: var(--ok); }

.quiz-meta {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.3rem 1rem;
  font-size: 0.83rem;
  margin-bottom: 1rem;
}
.quiz-meta dt { color: var(--muted); font-weight: 600; }

.quiz-links { display: flex; gap: 0.5rem; flex-wrap: wrap; }

.quiz-preview-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: 0;
  margin: 0;
}
.quiz-preview-list li {
  font-size: 0.8rem;
  color: var(--text);
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
}

/* ── Quiz detail question list ── */
.qd-header-card {
  margin-bottom: 0.75rem;
}
.qd-header-top {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 0.6rem;
}
.qd-header-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.3;
}
.qd-header-desc {
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 0.2rem;
}
.qd-meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.1rem;
}
.qd-meta-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.75rem;
  color: var(--muted);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 0.2rem 0.6rem;
}
.qd-meta-chip strong { color: var(--text); }

.qd-questions-section {
  display: flex;
  flex-direction: column;
  gap: 0;
}
.qd-loading-state {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 1.5rem;
  color: var(--muted);
  font-size: 0.85rem;
  justify-content: center;
}
.qd-spinner {
  width: 18px;
  height: 18px;
  border: 2px solid var(--line);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  flex-shrink: 0;
}
@keyframes spin { to { transform: rotate(360deg); } }

.qd-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
.qd-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.75rem 0.9rem;
  transition: box-shadow 0.15s;
}
.qd-card:hover {
  box-shadow: 0 2px 10px rgba(14,116,144,0.1);
  border-color: #b0dce8;
}
.qd-card-header {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  margin-bottom: 0.5rem;
}
.qd-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  font-size: 0.68rem;
  font-weight: 700;
  flex-shrink: 0;
}
.qd-type-pill {
  font-size: 0.67rem;
  font-weight: 600;
  border-radius: 20px;
  padding: 0.15rem 0.55rem;
  letter-spacing: 0.01em;
}
.qd-type-mcq   { background: #e0f2fe; color: #0369a1; }
.qd-type-tf    { background: #f3e8ff; color: #7c3aed; }
.qd-type-fill  { background: #fef3c7; color: #92400e; }

.qd-question-text {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text);
  line-height: 1.55;
  margin: 0 0 0.6rem;
}

/* Options */
.qd-opts {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}
.qd-opt {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.55rem;
  border-radius: 7px;
  border: 1px solid var(--line);
  background: var(--bg);
  font-size: 0.8rem;
  color: var(--text);
  transition: background 0.1s;
}
.qd-opt--correct {
  background: #ecfdf5;
  border-color: #6ee7b7;
  color: #065f46;
}
.qd-opt-letter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border-radius: 4px;
  background: #e2eef3;
  color: var(--primary);
  font-size: 0.68rem;
  font-weight: 700;
  flex-shrink: 0;
}
.qd-opt-letter--correct {
  background: #6ee7b7;
  color: #065f46;
}
.qd-opt-text { flex: 1; }
.qd-opt-check { color: #059669; margin-left: auto; }

/* Answer row (fill_blank / true_false without options) */
.qd-answer-row {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: #ecfdf5;
  border: 1px solid #6ee7b7;
  border-radius: 7px;
  padding: 0.3rem 0.65rem;
  font-size: 0.8rem;
}
.qd-answer-label {
  font-weight: 600;
  color: #065f46;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.qd-answer-value { color: #065f46; font-weight: 500; }

/* Explanation */
.qd-explanation {
  margin-top: 0.55rem;
  padding: 0.4rem 0.65rem;
  background: #fffbeb;
  border-left: 3px solid var(--accent);
  border-radius: 0 6px 6px 0;
  font-size: 0.78rem;
  color: #78350f;
  line-height: 1.5;
}
.qd-exp-label {
  font-weight: 700;
  margin-right: 0.25rem;
  text-transform: uppercase;
  font-size: 0.68rem;
  letter-spacing: 0.05em;
}

/* Empty / error state */
.qd-empty {
  text-align: center;
  padding: 2rem;
  color: var(--muted);
  font-size: 0.85rem;
  list-style: none;
}
.qd-empty--error { color: var(--bad); }


.placeholder-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  min-height: 200px;
  color: var(--muted);
  text-align: center;
}

/* ── Modal ───────────────────────────────────────── */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.42);
  z-index: 200;
  backdrop-filter: blur(2px);
}

.modal-box {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 210;
  background: var(--panel);
  border-radius: 14px;
  box-shadow: 0 8px 40px rgba(0,0,0,0.2);
  width: min(600px, calc(100vw - 2rem));
  max-height: 80vh;
  overflow-y: auto;
  padding: 1.75rem 2rem;
  display: flex;
  flex-direction: column;
  position: fixed;
}

.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--muted);
  padding: 0.2rem;
  border-radius: 6px;
  transition: color 0.15s, background 0.15s;
}
.modal-close:hover { color: var(--bad); background: #fee2e2; }

.modal-q-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.9rem;
}
.modal-q-text {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.5;
  margin-bottom: 1rem;
}

.modal-options {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  margin-bottom: 1rem;
}

.modal-opt {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.75rem;
  border-radius: 7px;
  background: var(--bg);
  font-size: 0.85rem;
  border: 1px solid var(--line);
}

.modal-opt-correct {
  background: #d1fae5;
  border-color: #6ee7b7;
  font-weight: 600;
  color: var(--ok);
}

.modal-answer {
  background: #d1fae5;
  border: 1px solid #6ee7b7;
  border-radius: 7px;
  padding: 0.55rem 0.85rem;
  font-size: 0.85rem;
  color: var(--ok);
  margin-bottom: 0.75rem;
}

.modal-explanation {
  background: #fef9e7;
  border: 1px solid #fde68a;
  border-radius: 7px;
  padding: 0.55rem 0.85rem;
  font-size: 0.82rem;
  color: #92400e;
}

/* ── Icons ───────────────────────────────────────── */
.icon { width: 1.1em; height: 1.1em; display: inline-block; vertical-align: middle; }
.icon-sm { width: 0.95em; height: 0.95em; }
.icon-lg { width: 1.4em; height: 1.4em; }
.icon-xl { width: 2.5em; height: 2.5em; }

/* ── Empty state ─────────────────────────────────── */
.empty-text {
  text-align: center;
  color: var(--muted);
  padding: 2rem;
  font-size: 0.88rem;
}

.alert-ok {
  background: #d1fae5;
  border: 1px solid #6ee7b7;
  color: #065f46;
  border-radius: 7px;
  padding: 0.6rem 0.9rem;
  font-size: 0.82rem;
  margin-bottom: 1rem;
}

.alert-error {
  background: #fee2e2;
  border: 1px solid #fca5a5;
  color: var(--bad);
  border-radius: 7px;
  padding: 0.6rem 0.9rem;
  font-size: 0.82rem;
  margin-bottom: 1rem;
}

.card-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.hint-text {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
  display: block;
}

.req { color: var(--bad); }

/* ── Tag checkbox grid ── */
.tag-checkbox-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.75rem;
  max-height: 140px;
  overflow-y: auto;
  padding: 0.5rem 0;
}
.tag-checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.82rem;
  cursor: pointer;
  white-space: nowrap;
}

/* ── Login page ──────────────────────────────────── */
.login-body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: radial-gradient(circle at 20% 30%, #d0eef8 0%, transparent 50%),
              linear-gradient(135deg, #f0f5f8 0%, #e8f4f8 100%);
}

.login-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: 0 8px 40px rgba(11,79,99,0.12);
  padding: 2.5rem 2.75rem;
  width: min(420px, calc(100vw - 2rem));
}

.login-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--primary-deep);
  margin-bottom: 1.5rem;
}

.login-heading {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 1.25rem;
}

/* ── Responsive ──────────────────────────────────── */
@media (max-width: 900px) {
  .chart-row { flex-direction: column; }
  .two-col-layout { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .sidebar {
    transform: translateX(calc(-1 * var(--sidebar-w)));
  }
  .sidebar.open {
    transform: translateX(0);
  }
  .main-wrap {
    margin-left: 0;
  }
  .hamburger { display: flex; }
  .stat-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
  .stat-grid { grid-template-columns: 1fr; }
  .content { padding: 1rem; }
  .topbar { padding: 0 1rem; }
}

/* -- Feedback page ------------------------------------ */
.fb-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.status-pill {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.status-new      { background: #fff0c2; color: #7a5200; }
.status-read     { background: #dbeafe; color: #1e40af; }
.status-resolved { background: #d1fae5; color: #065f46; }

.action-group {
  display: flex;
  gap: 0.4rem;
  align-items: center;
  flex-wrap: wrap;
}

/* -- Feedback subject cell ---------------------------- */
.fb-subject-btn {
  background: none;
  border: none;
  padding: 0;
  margin: 0;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--accent);
  cursor: pointer;
  max-width: 200px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  display: block;
  text-align: left;
}

.fb-subject-btn:hover {
  text-decoration: underline;
}