:root {
  --ink: #161410;
  --muted: #6d6458;
  --paper: #f3eee4;
  --navy: #0e1c33;
  --navy-2: #17324f;
  --copper: #b57a3a;
  --gold: #d7b56a;
  --gold-2: #f0dfb4;
  --brick: #9b3b32;
  --forest: #2a6a4f;
  --rule: #e0d6c6;
  --white: #fffdf8;
  --shadow: 0 18px 40px rgba(14, 28, 51, 0.08);
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  --serif: "Fraunces", Georgia, serif;
  --sans: "Outfit", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  color: var(--ink);
  background:
    radial-gradient(1200px 420px at 10% -10%, rgba(213, 181, 106, 0.18), transparent 55%),
    linear-gradient(180deg, #f7f2e9 0%, var(--paper) 40%);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
body::before {
  content: "";
  pointer-events: none;
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='.045'/%3E%3C/svg%3E");
  z-index: 0;
}
header, main, footer, .toast-host, .modal { position: relative; z-index: 1; }

a { color: var(--navy-2); }
code, .mono, pre { font-family: var(--mono); font-size: 0.92em; }

.site-header {
  background: linear-gradient(180deg, #12243f, var(--navy));
  color: var(--gold-2);
  border-bottom: 3px solid var(--copper);
  position: sticky;
  top: 0;
  z-index: 20;
}
.header-inner {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0.85rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: inherit;
  text-decoration: none;
}
.brand strong { display: block; font-family: var(--serif); color: #fff; font-size: 1.08rem; font-weight: 700; }
.brand em { font-style: italic; font-size: 0.8rem; color: var(--gold-2); opacity: 0.9; }
.crest {
  width: 44px; height: 44px;
  border: 1.5px solid var(--gold);
  display: grid; place-items: center;
  font-family: var(--serif);
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--gold);
  background: rgba(255,255,255,0.03);
}
.crest.large { width: 68px; height: 68px; font-size: 1.05rem; }
.header-nav { display: flex; gap: 0.25rem; flex: 1; }
.header-nav a {
  color: #e8e0d2;
  text-decoration: none;
  font-size: 0.92rem;
  padding: 0.4rem 0.7rem;
  border-radius: 999px;
}
.header-nav a:hover, .header-nav a.is-on {
  color: #fff;
  background: rgba(255,255,255,0.08);
}
.who { display: flex; align-items: center; gap: 0.65rem; color: #fff; font-size: 0.9rem; }
.who-name { font-weight: 600; }
.who-role {
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 0.68rem;
  color: var(--gold-2);
  border: 1px solid rgba(215,181,106,0.4);
  padding: 0.12rem 0.4rem;
}

.page { flex: 1; max-width: 1240px; width: 100%; margin: 0 auto; padding: 1.6rem 1.25rem 3rem; }
.exam-body .page { max-width: 1440px; }
.site-footer {
  border-top: 1px solid var(--rule);
  padding: 1rem 1.25rem 1.4rem;
  display: flex; justify-content: space-between; gap: 1rem;
  color: var(--muted); font-size: 0.82rem;
  max-width: 1240px; width: 100%; margin: 0 auto;
}

.hero-strip {
  display: flex; justify-content: space-between; gap: 1.5rem;
  align-items: flex-end;
  padding-bottom: 1.2rem;
  margin-bottom: 1.4rem;
  border-bottom: 1px solid var(--rule);
}
.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.72rem;
  color: var(--muted);
  margin: 0 0 0.4rem;
  font-weight: 600;
}
.eyebrow.light { color: var(--gold-2); }
h1, h2, h3 { font-family: var(--serif); font-weight: 700; margin: 0 0 0.4rem; letter-spacing: -0.02em; }
h1 { font-size: clamp(1.7rem, 2.4vw, 2.15rem); }
p { line-height: 1.6; }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid transparent;
  padding: 0.52rem 1rem;
  font: 600 0.9rem var(--sans);
  cursor: pointer;
  text-decoration: none;
  background: transparent;
  color: var(--navy);
  border-radius: 8px;
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--navy); color: #fff; box-shadow: 0 8px 18px rgba(14,28,51,.18); }
.btn-primary:hover { background: var(--navy-2); }
.btn-gold { background: var(--gold); color: var(--navy); }
.btn-ghost { border-color: rgba(215,181,106,.55); color: var(--gold-2); }
.who .btn-ghost { color: var(--gold-2); }
.page .btn-ghost { color: var(--navy); border-color: var(--rule); background: var(--white); }
.btn-danger { background: var(--brick); color: #fff; }
.btn.full { width: 100%; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }
.btn.busy { pointer-events: none; opacity: 0.7; }

.flash-stack { margin-bottom: 1rem; }
.flash { padding: 0.75rem 0.95rem; border: 1px solid var(--rule); background: var(--white); border-radius: 10px; }
.flash-ok { border-left: 4px solid var(--forest); }
.flash-err { border-left: 4px solid var(--brick); background: #fbeeee; color: var(--brick); }
.flash-message { border-left: 4px solid var(--copper); }

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1rem;
}
.paper-card, .panel {
  background: var(--white);
  border: 1px solid var(--rule);
  padding: 1.15rem 1.25rem;
  border-radius: 16px;
  box-shadow: var(--shadow);
}
.paper-card { transition: transform .18s ease, border-color .18s ease; }
.paper-card:hover { transform: translateY(-3px); border-color: #d4c3a3; }
.paper-card header, .panel-head {
  display: flex; justify-content: space-between; gap: 0.5rem; align-items: center;
}
.paper-card h2 { font-size: 1.22rem; }
.paper-card footer {
  display: flex; justify-content: space-between; align-items: center;
  margin-top: 1rem; padding-top: 0.85rem; border-top: 1px solid var(--rule);
}
.pill {
  font-size: 0.72rem;
  border: 1px solid #e2c98a;
  color: #7a6230;
  padding: 0.18rem 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: 999px;
  background: #fbf6ea;
}
.pill.muted { border-color: var(--rule); color: var(--muted); background: #f7f3ea; }
.type-row { display: flex; gap: 0.4rem; list-style: none; padding: 0; margin: 0.85rem 0 0; flex-wrap: wrap; }
.type-row li, .type-badge {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  padding: 0.2rem 0.5rem;
  background: #efe6d4;
  color: var(--navy);
  border-radius: 999px;
  font-weight: 600;
}
.type-python { background: #dce8f5; }
.type-sql { background: #dcefe4; }
.type-eda { background: #f5e6d0; }
.type-descriptive { background: #eee6f5; }

.status {
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  background: #eee9df;
}
.status.live { color: #9a5b12; background: #f8ead2; }
.status.done { color: var(--forest); background: #dcefe4; }

.stat-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.85rem;
  margin-bottom: 1.4rem;
}
.stat-row article, .score-summary div {
  background: linear-gradient(180deg, #17324f, var(--navy));
  color: #fff;
  padding: 1.05rem 1.15rem;
  border-radius: 16px;
  box-shadow: var(--shadow);
}
.stat-row em, .score-summary em {
  font-family: var(--serif);
  font-size: 2rem;
  font-style: normal;
  display: block;
}
.stat-row span, .score-summary span { color: var(--gold-2); font-size: 0.82rem; letter-spacing: 0.04em; }
.score-summary { display: flex; gap: 0.7rem; }
.score-summary div { min-width: 120px; }

table.plain { width: 100%; border-collapse: collapse; background: transparent; }
table.plain th, table.plain td {
  text-align: left; padding: 0.8rem 0.7rem;
  border-bottom: 1px solid var(--rule);
  vertical-align: middle;
}
table.plain th { font-size: 0.74rem; text-transform: uppercase; letter-spacing: 0.07em; color: var(--muted); }
table.plain tbody tr:hover td { background: #faf6ee; }

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.85rem 1rem;
  margin-bottom: 1.2rem;
}
.form-grid .full { grid-column: 1 / -1; }
.type-picker {
  border: 1px dashed var(--rule);
  border-radius: 14px;
  padding: 0.9rem 1rem 1rem;
  margin: 0;
}
.type-picker legend {
  font-family: var(--serif);
  font-weight: 700;
  padding: 0 0.35rem;
}
.type-choices {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.55rem;
  margin-top: 0.7rem;
}
.type-choice, .type-all { gap: 0.55rem; }
.type-all { margin-top: 0.35rem; font-weight: 700; }
.type-choice .type-badge { font-size: 0.78rem; }
label { display: flex; flex-direction: column; gap: 0.35rem; font-size: 0.88rem; font-weight: 600; }
label.check { flex-direction: row; align-items: center; }
input, select, textarea {
  font: 400 0.95rem var(--sans);
  padding: 0.62rem 0.7rem;
  border: 1px solid var(--rule);
  background: #fff;
  color: var(--ink);
  border-radius: 10px;
}
input:focus, select:focus, textarea:focus, .desc-editor:focus {
  outline: 2px solid rgba(181,122,58,.35);
  border-color: var(--copper);
}
textarea.mono { font-family: var(--mono); font-size: 0.85rem; }
.crumb { font-size: 0.9rem; margin-bottom: 0.6rem; }
.question-edit { position: relative; }
.delete-inline { margin: -0.6rem 0 1.2rem; }
.empty-state {
  text-align: center;
  color: var(--muted);
  padding: 1.6rem 1rem;
}

.login-body {
  min-height: 100vh;
  background:
    radial-gradient(900px 500px at 15% 10%, rgba(215,181,106,.2), transparent 50%),
    linear-gradient(160deg, #0b172b 0%, #12243f 55%, #1a334f 100%);
  display: grid;
  place-items: center;
  padding: 2rem 1rem;
}
.login-wrap {
  width: min(960px, 100%);
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  background: var(--white);
  border: 1px solid rgba(215,181,106,.55);
  border-radius: 22px;
  overflow: hidden;
  box-shadow: 0 30px 80px rgba(0,0,0,.28);
}
.login-panel {
  background: linear-gradient(180deg, #12243f, #0e1c33);
  color: #efe6d4;
  padding: 2.4rem;
}
.login-panel h1 { color: #fff; font-size: 2rem; margin: 0.4rem 0 0.7rem; }
.login-points { padding-left: 1.1rem; line-height: 1.8; }
.login-card { padding: 2.3rem; display: flex; flex-direction: column; gap: 0.9rem; }
.login-card h2 { font-size: 1.5rem; }
.muted { color: var(--muted); }
.demo-creds {
  margin-top: 0.2rem;
  padding-top: 0.85rem;
  border-top: 1px dashed var(--rule);
  font-size: 0.88rem;
}
.demo-creds p { margin: 0.2rem 0; }

.exam-top {
  display: flex; justify-content: space-between; gap: 1rem; align-items: flex-end;
  margin-bottom: 1rem;
  padding-bottom: 0.95rem;
  border-bottom: 1px solid var(--rule);
}
.exam-meta { display: flex; gap: 0.7rem; align-items: center; }
.timer {
  font-family: var(--mono);
  background: var(--navy);
  color: var(--gold-2);
  padding: 0.6rem 0.9rem;
  min-width: 98px;
  text-align: center;
  font-size: 1.2rem;
  border-radius: 10px;
  letter-spacing: 0.04em;
}
.timer.low { background: var(--brick); color: #fff; animation: pulse 1.2s ease-in-out infinite; }
@keyframes pulse { 50% { opacity: .75; } }
.exam-layout { display: grid; grid-template-columns: 250px 1fr; gap: 1rem; }
.qnav {
  background: var(--white);
  border: 1px solid var(--rule);
  padding: 0.5rem;
  align-self: start;
  position: sticky;
  top: 5.2rem;
  border-radius: 16px;
  box-shadow: var(--shadow);
}
.qnav button {
  display: block; width: 100%;
  text-align: left;
  background: transparent;
  border: 0;
  border-left: 3px solid transparent;
  padding: 0.62rem 0.65rem;
  cursor: pointer;
  font: 500 0.9rem var(--sans);
  color: var(--ink);
  border-radius: 0 10px 10px 0;
}
.qnav button.active { border-left-color: var(--copper); background: #f6efe0; }
.qnav button small { display: block; color: var(--muted); font-size: 0.72rem; text-transform: uppercase; margin-top: 0.15rem; }
.qmain { display: flex; flex-direction: column; gap: 0.85rem; }
.prompt-card, .console {
  background: var(--white);
  border: 1px solid var(--rule);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow);
}
.prompt-card { padding: 1.05rem 1.15rem; }
.prompt-head { display: flex; align-items: baseline; gap: 0.7rem; }
.prompt-head h2 { flex: 1; font-size: 1.18rem; }
.points { color: #7a6230; font-size: 0.85rem; font-weight: 600; }
.prompt-body p { margin: 0.4rem 0; }
.csv-bar { margin-top: 0.7rem; padding-top: 0.6rem; border-top: 1px dashed var(--rule); font-size: 0.9rem; }
.hidden { display: none !important; }

.editor-toolbar {
  display: flex; align-items: center; gap: 0.5rem;
  background: var(--navy);
  color: var(--gold-2);
  padding: 0.45rem 0.65rem;
  flex-wrap: wrap;
}
.editor-toolbar .spacer { flex: 1; }
.editor-toolbar .btn-ghost { background: transparent; color: var(--gold-2); border-color: rgba(215,181,106,.45); }
#editor { height: 340px; border: 0; }
.console header {
  display: flex; justify-content: space-between;
  padding: 0.45rem 0.75rem;
  background: #12151c;
  color: #c8c2b4;
  font-size: 0.8rem;
}
.console pre {
  margin: 0;
  padding: 0.75rem 0.85rem;
  background: #12151c;
  color: #d7eccf;
  min-height: 2.2rem;
  white-space: pre-wrap;
  overflow: auto;
}
.console pre.err { color: #f0b4b4; border-top: 1px solid #2a3140; }
.plots { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 0.6rem; padding: 0.7rem; background: #12151c; }
.plots img { width: 100%; background: #fff; border-radius: 8px; }

.desc-editor {
  min-height: 280px;
  background: #fff;
  border: 1px solid var(--rule);
  border-top: 0;
  padding: 1rem;
  line-height: 1.65;
}
.rte-tools { display: flex; gap: 0.25rem; flex-wrap: wrap; }
.rte-tools button {
  background: #1e3a5f;
  color: #fff;
  border: 1px solid #3a567c;
  padding: 0.28rem 0.5rem;
  cursor: pointer;
  border-radius: 6px;
}
.desc-editor table, .desc-preview table { border-collapse: collapse; width: 100%; }
.desc-editor td, .desc-preview td { border: 1px solid #bbb; padding: 0.3rem 0.45rem; min-width: 80px; }

.modal {
  position: fixed; inset: 0;
  background: rgba(14,28,51,0.62);
  display: grid; place-items: center;
  z-index: 40;
  padding: 1rem;
  backdrop-filter: blur(4px);
}
.modal-card {
  background: var(--white);
  width: min(920px, 100%);
  padding: 1rem;
  border: 1px solid var(--gold);
  border-radius: 16px;
}
.modal-card header { display: flex; justify-content: space-between; align-items: center; }
.draw-tools { display: flex; gap: 0.8rem; align-items: center; margin: 0.7rem 0; flex-wrap: wrap; }
#draw-canvas { width: 100%; border: 1px solid var(--rule); background: #fff; cursor: crosshair; border-radius: 10px; }

.eval-block {
  background: var(--white);
  border: 1px solid var(--rule);
  padding: 1.15rem 1.25rem;
  margin-bottom: 1rem;
  border-radius: 16px;
  box-shadow: var(--shadow);
}
.eval-block header { display: flex; align-items: baseline; gap: 0.7rem; margin-bottom: 0.6rem; }
.eval-block h2 { flex: 1; font-size: 1.15rem; }
.code-view, .out, .err {
  background: #12151c;
  color: #d7eccf;
  padding: 0.85rem;
  overflow: auto;
  white-space: pre-wrap;
  border-radius: 10px;
}
.err { color: #f0b4b4; }
.io-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.7rem; }
.muted-box { background: #f7f1e6; padding: 0.75rem 0.85rem; margin-bottom: 0.8rem; border-radius: 10px; }
.desc-preview { border: 1px solid var(--rule); padding: 0.85rem; min-height: 80px; border-radius: 10px; background: #fff; }
.run-history { margin: 0.8rem 0; }
.run-card { border-top: 1px dashed var(--rule); padding: 0.7rem 0; }
.score-form { display: grid; grid-template-columns: 200px 1fr auto; gap: 0.7rem; align-items: end; margin-top: 0.8rem; }
.score-form .full { grid-column: 1 / -1; }

.toast-host {
  position: fixed;
  right: 1.1rem;
  bottom: 1.1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  z-index: 50;
}
.toast {
  background: var(--navy);
  color: #fff;
  padding: 0.7rem 0.9rem;
  border-radius: 10px;
  box-shadow: var(--shadow);
  min-width: 180px;
  animation: rise .22s ease;
}
.toast.ok { border-left: 4px solid var(--gold); }
.toast.err { background: var(--brick); }
@keyframes rise { from { transform: translateY(8px); opacity: 0; } }

@media (max-width: 860px) {
  .login-wrap, .exam-layout, .form-grid, .stat-row, .io-grid, .score-form {
    grid-template-columns: 1fr;
  }
  .header-inner { flex-wrap: wrap; }
  .site-footer { flex-direction: column; }
  .qnav { position: static; }
}