/* Shared styles: login, candidate home, practice, results, admin.
   The exam room has its own sheet (exam.css) layered on top of this one. */

:root {
  --brand: #0b5cad;
  --brand-600: #094f95;
  --brand-50: #eaf2fb;
  --ok: #1e8e3e;
  --ok-50: #e6f4ea;
  --bad: #c5221f;
  --bad-50: #fce8e6;
  --warn: #b06000;
  --warn-50: #fef3e0;
  --mark: #7b3fb3;
  --mark-50: #f3ebfa;
  --ink: #1f2937;
  --ink-2: #374151;
  --muted: #5f6b7a;
  --faint: #8a94a3;
  --line: #dfe3ea;
  --line-2: #eceff4;
  --bg: #f4f6f9;
  --card: #ffffff;
  --radius: 8px;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.06), 0 1px 3px rgba(16, 24, 40, 0.08);
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, 'Liberation Mono', monospace;
  --sans: 'Segoe UI', Roboto, -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, sans-serif;
}

* {
  box-sizing: border-box;
}
html,
body {
  margin: 0;
  padding: 0;
}
body {
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.5;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
[hidden] {
  display: none !important;
}
a {
  color: var(--brand);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}
h1,
h2,
h3,
h4 {
  margin: 0;
  color: var(--ink);
  line-height: 1.25;
}
p {
  margin: 0;
}
code,
pre {
  font-family: var(--mono);
}

/* ------------------------------------------------------------ controls */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: 36px;
  padding: 0 16px;
  border-radius: 4px;
  border: 1px solid transparent;
  font: inherit;
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  white-space: nowrap;
  user-select: none;
  transition:
    background 0.12s,
    border-color 0.12s,
    color 0.12s;
}
.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
.btn-primary {
  background: var(--brand);
  color: #fff;
}
.btn-primary:hover:not(:disabled) {
  background: var(--brand-600);
}
.btn-outline {
  background: #fff;
  color: var(--brand);
  border-color: var(--brand);
}
.btn-outline:hover:not(:disabled) {
  background: var(--brand-50);
}
.btn-ghost {
  background: #fff;
  color: var(--ink-2);
  border-color: var(--line);
}
.btn-ghost:hover:not(:disabled) {
  background: #f7f8fa;
}
.btn-danger {
  background: #fff;
  color: var(--bad);
  border-color: var(--bad);
}
.btn-danger:hover:not(:disabled) {
  background: var(--bad-50);
}
.btn-solid-danger {
  background: var(--bad);
  color: #fff;
}
.btn-lg {
  height: 42px;
  padding: 0 22px;
  font-size: 15px;
}
.btn-sm {
  height: 30px;
  padding: 0 10px;
  font-size: 13px;
}

label.field {
  display: block;
  margin-bottom: 14px;
}
label.field > span {
  display: block;
  font-weight: 600;
  font-size: 13px;
  margin-bottom: 6px;
  color: var(--ink-2);
}
input[type='text'],
input[type='email'],
input[type='password'],
input[type='number'],
select,
textarea {
  width: 100%;
  height: 38px;
  padding: 0 11px;
  font: inherit;
  color: var(--ink);
  border: 1px solid #c9ced6;
  border-radius: 4px;
  background: #fff;
}
textarea {
  height: auto;
  padding: 8px 11px;
}
input:focus,
select:focus,
textarea:focus,
.btn:focus-visible {
  outline: 2px solid rgba(11, 92, 173, 0.35);
  outline-offset: 1px;
  border-color: var(--brand);
}

.alert {
  padding: 10px 12px;
  border-radius: 4px;
  font-size: 13px;
  border: 1px solid;
}
.alert-error {
  background: var(--bad-50);
  border-color: #f4c7c3;
  color: #8a1c1a;
}
.alert-info {
  background: var(--brand-50);
  border-color: #c4dbf3;
  color: #0b3f75;
}
.alert-warn {
  background: var(--warn-50);
  border-color: #f6d9a8;
  color: #7a4300;
}
.alert-ok {
  background: var(--ok-50);
  border-color: #b7dfc3;
  color: #14532d;
}

.badge {
  display: inline-flex;
  align-items: center;
  height: 22px;
  padding: 0 8px;
  border-radius: 11px;
  font-size: 12px;
  font-weight: 600;
  background: var(--line-2);
  color: var(--ink-2);
  white-space: nowrap;
}
.badge-ok {
  background: var(--ok-50);
  color: var(--ok);
}
.badge-bad {
  background: var(--bad-50);
  color: var(--bad);
}
.badge-warn {
  background: var(--warn-50);
  color: var(--warn);
}
.badge-brand {
  background: var(--brand-50);
  color: var(--brand);
}
.badge-mark {
  background: var(--mark-50);
  color: var(--mark);
}

/* ------------------------------------------------------------ page chrome */

.topbar {
  min-height: 56px;
  padding: 6px 0;
  background: #fff;
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
}
.topbar .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
}
.brandmark {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  color: var(--ink);
}
.brandmark .logo {
  width: 30px;
  height: 30px;
  border-radius: 6px;
  background: var(--brand);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 15px;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.brandmark small {
  display: block;
  font-weight: 500;
  color: var(--muted);
  font-size: 12px;
}
.wrap {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 20px;
}
.page {
  padding: 26px 0 60px;
}
.nav-links {
  display: flex;
  gap: 4px;
  align-items: center;
}
.nav-links a {
  white-space: nowrap;
  padding: 7px 12px;
  border-radius: 4px;
  color: var(--ink-2);
  font-weight: 600;
  font-size: 13px;
}
.nav-links a:hover {
  background: var(--bg);
  text-decoration: none;
}
.nav-links a.active {
  background: var(--brand-50);
  color: var(--brand);
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.card-pad {
  padding: 20px;
}
.card-head {
  padding: 14px 20px;
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.card-head h3 {
  font-size: 15px;
}
.grid {
  display: grid;
  gap: 16px;
}
.grid-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}
.grid-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}
.muted {
  color: var(--muted);
}
.faint {
  color: var(--faint);
}
.small {
  font-size: 12.5px;
}
.row {
  display: flex;
  align-items: center;
  gap: 10px;
}
.between {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.stack > * + * {
  margin-top: 12px;
}
.kpi .label {
  font-size: 12px;
  color: var(--muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.kpi .value {
  font-size: 26px;
  font-weight: 700;
  margin-top: 4px;
  letter-spacing: -0.01em;
}
.kpi .sub {
  font-size: 12.5px;
  color: var(--muted);
  margin-top: 2px;
}

table.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
}
.table th {
  text-align: left;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
  background: #fafbfc;
  white-space: nowrap;
}
.table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--line-2);
  vertical-align: middle;
}
.table tr:last-child td {
  border-bottom: none;
}
.table tr.clickable {
  cursor: pointer;
}
.table tr.clickable:hover td {
  background: #f8fafc;
}
.table .num {
  text-align: right;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.scroll-x {
  overflow-x: auto;
}

.bar {
  height: 8px;
  background: var(--line-2);
  border-radius: 4px;
  overflow: hidden;
  min-width: 80px;
}
.bar > i {
  display: block;
  height: 100%;
  border-radius: 4px;
  background: var(--brand);
}
.bar.ok > i {
  background: var(--ok);
}
.bar.warn > i {
  background: #e8a13a;
}
.bar.bad > i {
  background: var(--bad);
}

.empty {
  padding: 36px 20px;
  text-align: center;
  color: var(--muted);
}
.spinner {
  width: 18px;
  height: 18px;
  border: 2px solid var(--line);
  border-top-color: var(--brand);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  display: inline-block;
  vertical-align: middle;
}
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ------------------------------------------------------------ modal */

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(17, 24, 39, 0.55);
  display: grid;
  place-items: center;
  z-index: 1000;
  padding: 20px;
}
.modal {
  background: #fff;
  border-radius: 8px;
  width: 100%;
  max-width: 480px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.25);
  overflow: hidden;
}
.modal-head {
  padding: 16px 20px;
  border-bottom: 1px solid var(--line);
  font-weight: 700;
  font-size: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.modal-body {
  padding: 18px 20px;
  color: var(--ink-2);
}
.modal-foot {
  padding: 12px 20px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  background: #fafbfc;
}
.modal.warn .modal-head {
  background: var(--warn-50);
  color: #7a4300;
}
.modal.danger .modal-head {
  background: var(--bad-50);
  color: #8a1c1a;
}

/* ------------------------------------------------------------ question rendering (shared) */

.q-prompt {
  white-space: pre-wrap;
  font-size: 15px;
  line-height: 1.65;
  color: var(--ink);
}
.q-note {
  margin-top: 10px;
  font-size: 12.5px;
  color: var(--muted);
  font-style: italic;
}
.q-figure {
  margin-top: 16px;
  overflow-x: auto;
}
.q-figure svg {
  max-width: 100%;
  height: auto;
}
.codeblock {
  margin-top: 14px;
  border: 1px solid #d9dee6;
  border-radius: 6px;
  background: #f8f9fb;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 13.5px;
  line-height: 1.6;
}
.codeblock table {
  border-collapse: collapse;
  width: 100%;
}
.codeblock td {
  padding: 0;
  vertical-align: top;
}
.codeblock td.ln {
  width: 1%;
  padding: 0 10px 0 12px;
  text-align: right;
  color: #9aa3af;
  user-select: none;
  border-right: 1px solid #e5e8ee;
  background: #f1f3f6;
}
.codeblock td.src {
  padding: 0 14px;
  white-space: pre;
  color: #1f2937;
}
.codeblock tr:first-child td {
  padding-top: 8px;
}
.codeblock tr:last-child td {
  padding-bottom: 8px;
}
.tok-kw {
  color: #0b5cad;
  font-weight: 600;
}
.tok-num {
  color: #b05a00;
}
.tok-str {
  color: #1e7a34;
}
.tok-com {
  color: #8a94a3;
  font-style: italic;
}

.option-svg svg {
  display: block;
  width: 72px;
  height: 72px;
}

/* explanation blocks */
.expl {
  border-top: 1px solid var(--line);
  margin-top: 16px;
  padding-top: 16px;
}
.expl h5 {
  margin: 14px 0 6px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
}
.expl h5:first-child {
  margin-top: 0;
}
.expl .summary {
  font-weight: 700;
  font-size: 14.5px;
}
.expl ul,
.expl ol {
  margin: 0;
  padding-left: 20px;
}
.expl li {
  margin: 3px 0;
}
.expl .shortcut {
  background: var(--brand-50);
  border-left: 3px solid var(--brand);
  padding: 8px 12px;
  border-radius: 0 4px 4px 0;
  color: #0b3f75;
}
.expl .traps li::marker {
  color: var(--bad);
}
.expl table {
  border-collapse: collapse;
  font-size: 12.5px;
  margin-top: 4px;
  font-family: var(--mono);
}
.expl th,
.expl td {
  border: 1px solid var(--line);
  padding: 4px 10px;
  text-align: center;
}
.expl th {
  background: #f3f5f8;
  font-family: var(--sans);
  font-weight: 700;
}
.optnotes {
  list-style: none;
  padding: 0 !important;
}
.optnotes li {
  display: flex;
  gap: 8px;
  padding: 5px 0;
  border-bottom: 1px dashed var(--line-2);
}
.optnotes li:last-child {
  border-bottom: none;
}
.optnotes b {
  min-width: 22px;
}

@media (max-width: 900px) {
  .grid-3,
  .grid-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .grid-2 {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 560px) {
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
  .nav-links a {
    padding: 6px 8px;
    font-size: 12.5px;
  }
  .brandmark small {
    display: none;
  }
  .brandmark {
    font-size: 13.5px;
  }
}