:root {
  --bg: #050712;
  --bg-2: #0a0e1f;
  --bg-3: #131932;
  --accent: #40e0ff;
  --accent-magenta: #e645ff;
  --accent-dim: #2a8fa8;
  --ok: #6dffb5;
  --err: #ff5577;
  --text-main: #e4f3ff;
  --text-sub: #91a4c5;
  --border: rgba(64, 224, 255, 0.25);
  --border-strong: rgba(64, 224, 255, 0.6);
}

* { box-sizing: border-box; }

html, body {
  background: var(--bg);
  color: var(--text-main);
  font-family: 'Roboto Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  margin: 0;
  min-height: 100vh;
  background-image:
    linear-gradient(transparent 95%, rgba(64, 224, 255, 0.04) 95%),
    linear-gradient(90deg, transparent 95%, rgba(64, 224, 255, 0.04) 95%);
  background-size: 24px 24px;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-magenta); }

h1, h2, h3 {
  font-family: 'Press Start 2P', 'Roboto Mono', monospace;
  letter-spacing: 0.04em;
  margin: 0 0 0.6rem;
}

.wrap {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 1rem;
  margin-bottom: 1.5rem;
}
.brand .logo {
  font-family: 'Press Start 2P', monospace;
  font-size: 1.1rem;
  color: var(--accent);
  text-shadow: 0 0 6px rgba(64, 224, 255, 0.5);
}
.brand .sub {
  color: var(--text-sub);
  font-size: 0.8rem;
}
.brand .right { margin-left: auto; font-size: 0.8rem; color: var(--text-sub); }

.track {
  border: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(10, 14, 31, 0.7), rgba(5, 7, 18, 0.7));
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.5rem;
  border-radius: 4px;
  box-shadow: 0 0 24px rgba(64, 224, 255, 0.05) inset;
}
.track h2 { color: var(--accent); }
.track .tagline { color: var(--text-sub); margin-bottom: 1rem; font-size: 0.9rem; }
.track .toolkit {
  font-size: 0.75rem;
  color: var(--text-sub);
  margin-bottom: 1rem;
}
.track .toolkit code {
  background: var(--bg-3);
  border: 1px solid var(--border);
  padding: 0.05rem 0.35rem;
  margin-right: 0.25rem;
  border-radius: 2px;
  color: var(--accent);
}

.levels {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 0.85rem;
}

.level-card {
  border: 1px solid var(--border);
  background: var(--bg-2);
  padding: 0.9rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  transition: border-color 120ms ease, transform 120ms ease;
}
.level-card:hover { border-color: var(--border-strong); transform: translateY(-1px); }
.level-card.solved { border-color: var(--ok); }

.level-card .head {
  display: flex; justify-content: space-between; align-items: baseline;
}
.level-card .id {
  color: var(--text-sub);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
}
.level-card .points {
  color: var(--accent-magenta);
  font-size: 0.75rem;
}
.level-card .title {
  color: var(--text-main);
  font-weight: bold;
  font-size: 0.95rem;
}
.level-card .summary {
  color: var(--text-sub);
  font-size: 0.8rem;
  flex: 1;
}
.level-card button {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent-dim);
  padding: 0.4rem 0.6rem;
  font-family: inherit;
  font-size: 0.8rem;
  cursor: pointer;
  align-self: flex-start;
  transition: all 100ms ease;
}
.level-card button:hover {
  background: rgba(64, 224, 255, 0.1);
  border-color: var(--accent);
}

.notice {
  border: 1px solid var(--border);
  padding: 0.6rem 0.9rem;
  font-size: 0.85rem;
  color: var(--text-sub);
  background: rgba(64, 224, 255, 0.04);
  margin-bottom: 1rem;
}
.notice.err { color: var(--err); border-color: rgba(255, 85, 119, 0.6); background: rgba(255, 85, 119, 0.05); }
.notice.ok  { color: var(--ok);  border-color: rgba(109, 255, 181, 0.6); background: rgba(109, 255, 181, 0.05); }

/* play.html layout */
.play-wrap {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 1rem;
  height: calc(100vh - 7.5rem);
  min-height: 480px;
}
.term-panel {
  border: 1px solid var(--border);
  background: #000;
  padding: 0.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
#terminal { flex: 1; min-height: 0; }

.boot-console {
  margin: 0;
  padding: 0.5rem 0.7rem;
  background: #000;
  color: var(--accent);
  font-family: 'Roboto Mono', ui-monospace, monospace;
  font-size: 0.86rem;
  line-height: 1.4;
  white-space: pre-wrap;
  border: 1px solid var(--border);
  flex: 1;
  min-height: 0;
  overflow: hidden;
}
.boot-console .dim { color: var(--text-sub); }
.boot-console .ok  { color: var(--ok); }

.brief-text {
  font-size: 0.95rem;
  line-height: 1.5;
  color: var(--text-main);
  border-left: 2px solid var(--accent-magenta);
  padding-left: 0.7rem;
  margin: 0 0 1rem;
}

.hints-summary { color: var(--text-sub); font-size: 0.8rem; margin: 0 0 0.4rem; }
.hints-summary.warn { color: var(--accent-magenta); }
.hints-list { display: flex; flex-direction: column; gap: 0.4rem; }
.hint {
  border: 1px solid var(--border);
  padding: 0.45rem 0.55rem;
  background: var(--bg-3);
  font-size: 0.78rem;
}
.hint .head {
  display: flex; justify-content: space-between; align-items: baseline;
  color: var(--text-sub);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
}
.hint .penalty { color: var(--err); }
.hint .body { margin-top: 0.35rem; color: var(--text-main); }
.hint button {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent-dim);
  padding: 0.25rem 0.55rem;
  font-family: inherit;
  font-size: 0.74rem;
  cursor: pointer;
  margin-top: 0.35rem;
}
.hint button:hover { background: rgba(64, 224, 255, 0.1); border-color: var(--accent); }
.hint.revealed { border-color: var(--accent-magenta); background: rgba(230, 69, 255, 0.05); }

.countdown { display: flex; flex-direction: column; gap: 0.25rem; }
.countdown-bar {
  height: 6px;
  background: rgba(64, 224, 255, 0.08);
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}
.countdown-fill {
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, var(--ok), var(--accent));
  transition: width 250ms linear, background 250ms ease;
}
.countdown-fill.warn  { background: linear-gradient(90deg, #ffc857, #ff8c42); }
.countdown-fill.danger { background: linear-gradient(90deg, var(--err), #ff2655); }
.countdown-fill.expired { background: rgba(145, 164, 197, 0.4); }
.countdown-label {
  font-size: 0.72rem;
  color: var(--text-sub);
  letter-spacing: 0.06em;
  font-variant-numeric: tabular-nums;
}
.countdown-label.expired { color: var(--err); }

.point-breakdown {
  margin-top: 0.4rem;
  padding: 0.4rem 0.5rem;
  background: rgba(64, 224, 255, 0.05);
  border: 1px solid var(--border);
  font-size: 0.78rem;
  color: var(--text-sub);
  font-variant-numeric: tabular-nums;
}
.point-breakdown .row { display: flex; justify-content: space-between; }
.point-breakdown .row.total {
  margin-top: 0.25rem;
  padding-top: 0.25rem;
  border-top: 1px dashed var(--border);
  color: var(--accent-magenta);
  font-weight: bold;
}
.side-panel {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  overflow: auto;
}
.side-panel .card {
  border: 1px solid var(--border);
  background: var(--bg-2);
  padding: 0.9rem 1rem;
}
.side-panel .card h3 { color: var(--accent); font-size: 0.85rem; margin-bottom: 0.5rem; }
.side-panel .card p, .side-panel .card label { font-size: 0.8rem; color: var(--text-sub); }
.side-panel .card .value { color: var(--text-main); font-size: 0.85rem; word-break: break-all; }

input[type="text"] {
  width: 100%;
  background: var(--bg-3);
  border: 1px solid var(--border);
  color: var(--text-main);
  font-family: inherit;
  padding: 0.5rem 0.6rem;
  font-size: 0.9rem;
  margin-top: 0.4rem;
}
input[type="text"]:focus {
  outline: none;
  border-color: var(--accent);
}
button.primary {
  background: var(--accent);
  color: #001018;
  border: none;
  padding: 0.55rem 0.9rem;
  font-family: inherit;
  font-size: 0.85rem;
  cursor: pointer;
  margin-top: 0.6rem;
  font-weight: bold;
}
button.primary:hover { background: var(--accent-magenta); color: #fff; }
button.ghost {
  background: transparent;
  color: var(--text-sub);
  border: 1px solid var(--border);
  padding: 0.4rem 0.7rem;
  font-family: inherit;
  font-size: 0.8rem;
  cursor: pointer;
}

.status-pill {
  display: inline-block;
  padding: 0.1rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: 2px;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--text-sub);
}
.status-pill.connected { color: var(--ok); border-color: var(--ok); }
.status-pill.disconnected { color: var(--err); border-color: var(--err); }

footer {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  color: var(--text-sub);
  font-size: 0.75rem;
}

/* Leaderboard */
.lb-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}
.lb-table th, .lb-table td {
  text-align: left;
  padding: 0.45rem 0.6rem;
  border-bottom: 1px solid var(--border);
}
.lb-table th {
  color: var(--text-sub);
  font-weight: normal;
  letter-spacing: 0.08em;
  font-size: 0.7rem;
  text-transform: uppercase;
}
.lb-table td.rank { color: var(--accent); font-weight: bold; width: 3rem; }
.lb-table td.op { color: var(--text-main); }
.lb-table td.points { color: var(--accent-magenta); font-weight: bold; }
.lb-table td.dim { color: var(--text-sub); font-size: 0.78rem; }
.lb-table td.err { color: var(--err); }
.lb-table tr.fb-row { background: rgba(255, 85, 119, 0.06); }

.fb { color: var(--err); letter-spacing: 0.1em; font-size: 0.75rem; }

.level-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.9rem;
}
.tab {
  background: transparent;
  color: var(--text-sub);
  border: 1px solid var(--border);
  padding: 0.3rem 0.6rem;
  font-family: inherit;
  font-size: 0.75rem;
  cursor: pointer;
  letter-spacing: 0.06em;
  transition: all 100ms ease;
}
.tab:hover { color: var(--accent); border-color: var(--accent-dim); }
.tab.active { background: rgba(64, 224, 255, 0.1); border-color: var(--accent); color: var(--accent); }
.tab .tab-id { display: inline-block; }

/* First-blood marker on level cards (index page) */
.level-card .fb-tag {
  font-size: 0.7rem;
  color: var(--err);
  border: 1px solid rgba(255, 85, 119, 0.35);
  padding: 0.05rem 0.3rem;
  border-radius: 2px;
}

.brand .right a { color: var(--text-sub); }
.brand .right a:hover { color: var(--accent); }

/* Modal + breakdown */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(5, 7, 18, 0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  backdrop-filter: blur(3px);
  animation: modal-fade-in 180ms ease-out;
}
.modal[hidden] { display: none; }
.modal-card {
  background: var(--bg-2);
  border: 1px solid var(--accent);
  box-shadow: 0 0 40px rgba(64, 224, 255, 0.2);
  padding: 1.5rem 1.75rem;
  min-width: 320px;
  max-width: 480px;
  animation: modal-card-in 240ms cubic-bezier(.2,.9,.4,1.2);
}
.modal-card h2 {
  color: var(--accent);
  font-size: 1.1rem;
  margin: 0 0 0.25rem;
  text-shadow: 0 0 12px rgba(64, 224, 255, 0.55);
}
.modal-sub {
  color: var(--text-sub);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  margin-bottom: 1rem;
}
.breakdown-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  font-variant-numeric: tabular-nums;
  margin-bottom: 1rem;
}
.breakdown-table td {
  padding: 0.35rem 0;
  border-bottom: 1px solid var(--border);
}
.breakdown-table td:last-child { text-align: right; color: var(--text-main); }
.breakdown-table tr.dim td { color: var(--text-sub); font-size: 0.85rem; }
.breakdown-table tr.total td {
  border-bottom: none;
  border-top: 1px solid var(--accent-dim);
  padding-top: 0.6rem;
  font-size: 1.05rem;
  color: var(--accent-magenta);
  font-weight: bold;
  text-shadow: 0 0 10px rgba(230, 69, 255, 0.4);
}
.breakdown-table tr.fb td {
  color: var(--err);
  font-weight: bold;
}
.modal-actions {
  display: flex;
  gap: 0.5rem;
  justify-content: flex-end;
}
.modal-actions .ghost, .modal-actions .primary { margin-top: 0; }
@keyframes modal-fade-in { from { opacity: 0 } to { opacity: 1 } }
@keyframes modal-card-in {
  from { transform: translateY(12px) scale(0.97); opacity: 0; }
  to   { transform: translateY(0)    scale(1);    opacity: 1; }
}

/* Rank banner (homepage) */
.rank-banner {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
  padding: 0.6rem 0.85rem;
  border: 1px solid var(--accent-dim);
  background: linear-gradient(90deg, rgba(64, 224, 255, 0.06), rgba(230, 69, 255, 0.04));
  font-size: 0.82rem;
  font-variant-numeric: tabular-nums;
}
.rank-name { color: var(--text-sub); }
.rank-name span {
  color: var(--accent-magenta);
  font-family: 'Press Start 2P', monospace;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  margin-left: 0.4rem;
}
.rank-bar {
  flex: 1;
  height: 6px;
  background: rgba(64, 224, 255, 0.08);
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
  min-width: 200px;
}
.rank-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-magenta));
  width: 0%;
  transition: width 600ms ease-out;
}
.rank-meta { color: var(--text-sub); }

/* Handle-claim form (homepage) */
.handle-form {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--accent-dim);
  background: rgba(230, 69, 255, 0.04);
  font-size: 0.78rem;
}
.handle-label { color: var(--text-sub); margin-right: 0.4rem; }
.handle-form input[type=text] {
  flex: 0 0 auto;
  width: 16ch;
  margin-top: 0;
  font-size: 0.85rem;
  padding: 0.35rem 0.5rem;
}
.handle-form .primary { margin-top: 0; padding: 0.35rem 0.7rem; font-size: 0.78rem; }
.handle-msg { color: var(--ok); font-size: 0.75rem; }
.handle-msg.err { color: var(--err); }

/* "I'm new" / RECON toggle on homepage */
.view-toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--border);
  background: rgba(64, 224, 255, 0.04);
  font-size: 0.78rem;
}
.view-toggle-label { color: var(--text-sub); margin-right: 0.4rem; }
.view-toggle-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-main);
  font-family: inherit;
  font-size: 0.78rem;
  padding: 0.3rem 0.65rem;
  cursor: pointer;
  letter-spacing: 0.04em;
}
.view-toggle-btn:hover { border-color: var(--accent); color: var(--accent); }
.view-toggle-btn.active {
  background: rgba(64, 224, 255, 0.12);
  border-color: var(--accent);
  color: var(--accent);
}

/* Lesson page (split-pane) */
.lesson-wrap {
  display: grid;
  grid-template-columns: 420px 1fr;
  gap: 1rem;
  height: calc(100vh - 7.5rem);
  min-height: 480px;
}
.brief-panel {
  border: 1px solid var(--border);
  background: var(--bg-2);
  padding: 1rem 1.1rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}
.brief-panel #brief-content { flex: 1; overflow-y: auto; }
.brief-panel h1 { color: var(--accent); font-size: 1rem; margin: 0 0 0.6rem; }
.brief-panel h2 { color: var(--accent); font-size: 0.85rem; margin: 1rem 0 0.4rem; }
.brief-panel h3 { color: var(--accent-magenta); font-size: 0.78rem; margin: 0.8rem 0 0.3rem; }
.brief-panel p {
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--text-main);
  margin: 0 0 0.7rem;
}
.brief-panel code.inline {
  background: var(--bg-3);
  padding: 0.05rem 0.3rem;
  color: var(--accent);
  border-radius: 2px;
  font-size: 0.82rem;
}
.brief-panel pre {
  background: #000;
  border: 1px solid var(--border);
  padding: 0.55rem 0.7rem;
  overflow-x: auto;
  font-size: 0.82rem;
  margin: 0 0 0.85rem;
  position: relative;
}
.brief-panel pre.tryit {
  border-color: var(--accent-dim);
  background: linear-gradient(180deg, #001620, #000);
  cursor: default;
}
.brief-panel pre code { color: var(--text-main); white-space: pre; }
.tryit-run {
  position: absolute;
  top: 0.3rem;
  right: 0.4rem;
  background: rgba(64, 224, 255, 0.12);
  color: var(--accent);
  border: 1px solid var(--accent-dim);
  padding: 0.15rem 0.5rem;
  font-family: inherit;
  font-size: 0.7rem;
  cursor: pointer;
  letter-spacing: 0.04em;
}
.tryit-run:hover { background: rgba(64, 224, 255, 0.25); border-color: var(--accent); }

.lesson-nav {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding-top: 0.7rem;
  border-top: 1px solid var(--border);
  margin-top: 0.7rem;
}
.lesson-nav .ghost { padding: 0.35rem 0.6rem; }
.lesson-nav .primary { padding: 0.35rem 0.7rem; margin-top: 0; }
.lesson-status {
  flex: 1;
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-sub);
  letter-spacing: 0.05em;
}
.lesson-status.done { color: var(--ok); }

/* Recent-clears ticker (homepage) */
.ticker {
  margin-top: 1.5rem;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  background: rgba(64, 224, 255, 0.04);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  overflow: hidden;
}
.ticker-label {
  flex: 0 0 auto;
  font-family: 'Press Start 2P', monospace;
  font-size: 0.62rem;
  color: var(--accent);
  letter-spacing: 0.08em;
  white-space: nowrap;
}
.ticker-track {
  flex: 1 1 auto;
  white-space: nowrap;
  overflow: hidden;
  position: relative;
  font-size: 0.78rem;
  color: var(--text-sub);
  font-variant-numeric: tabular-nums;
}
.ticker-track .ticker-inner {
  display: inline-block;
  padding-left: 100%;
  animation: ticker-scroll 60s linear infinite;
}
.ticker-track:hover .ticker-inner { animation-play-state: paused; }
.ticker-track .ticker-item {
  display: inline-block;
  margin-right: 2.5rem;
}
.ticker-track .ticker-item .who { color: var(--text-main); }
.ticker-track .ticker-item .lvl { color: var(--accent); }
.ticker-track .ticker-item .pts { color: var(--accent-magenta); }
.ticker-empty { color: var(--text-sub); font-style: italic; }
@keyframes ticker-scroll {
  from { transform: translateX(0); }
  to   { transform: translateX(-100%); }
}
@media (prefers-reduced-motion: reduce) {
  .ticker-track .ticker-inner { animation: none; padding-left: 0; }
}

/* Accessibility: visually hidden but readable by screen readers */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}