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

:root {
  --bg: #0d0f14;
  --bg2: #141720;
  --bg3: #1c1f2e;
  --bg4: #242838;
  --border: #2a2e3f;
  --text: #e2e4f0;
  --text2: #8b90a8;
  --text3: #5a5f75;
  --accent: #6c8aff;
  --accent2: #4a6bff;
  --green: #3dd68c;
  --red: #f06292;
  --yellow: #ffca62;
  --orange: #ff8c5a;
  --purple: #b48eff;
  --mono: ui-monospace, 'JetBrains Mono', 'Fira Code', 'SF Mono', Menlo, monospace;
  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 4px 20px rgba(0,0,0,0.4);
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  min-height: 100vh;
}

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

/* HEADER */
.site-header {
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, #0f1118 0%, #0d0f14 100%);
  padding: 22px 32px 18px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 24px;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark { color: var(--accent); font-size: 22px; }
.brand-name { font-family: var(--mono); font-weight: 700; font-size: 18px; letter-spacing: 0.02em; }
.tagline { font-family: var(--mono); color: var(--text2); font-size: 14px; }
.header-stats { display: flex; gap: 24px; }
.stat { display: flex; flex-direction: column; align-items: flex-end; }
.stat-num { font-family: var(--mono); font-size: 22px; font-weight: 700; color: var(--accent); }
.stat-label { font-size: 11px; color: var(--text3); text-transform: uppercase; letter-spacing: 0.06em; }

/* TABS */
.tabs {
  display: flex;
  gap: 4px;
  padding: 0 32px;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}
.tab {
  background: transparent;
  border: none;
  color: var(--text2);
  font-size: 14px;
  font-weight: 500;
  padding: 14px 18px;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  font-family: inherit;
}
.tab:hover { color: var(--text); }
.tab.active { color: var(--accent); border-bottom-color: var(--accent); }

main { padding: 24px 32px 60px; max-width: 1400px; margin: 0 auto; }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* FILTER ROW */
.filter-row {
  display: flex;
  gap: 12px;
  align-items: flex-end;
  flex-wrap: wrap;
  padding: 14px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 18px;
}
.filter-row label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 11px;
  color: var(--text3);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.filter-row select,
.filter-row input[type="text"] {
  background: var(--bg3);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 7px 9px;
  font-size: 13px;
  font-family: inherit;
  min-width: 140px;
}
.filter-row input[type="text"] { min-width: 240px; }
.filter-row select:focus,
.filter-row input:focus { outline: none; border-color: var(--accent); }

button.btn-primary, button.btn-secondary {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  padding: 9px 16px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
}
button.btn-primary:hover { background: var(--accent2); }
button.btn-secondary {
  background: var(--bg3);
  color: var(--text);
  border: 1px solid var(--border);
}
button.btn-secondary:hover { background: var(--bg4); }

/* CARD GRID */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 14px;
}
.card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: border-color 0.15s, transform 0.15s;
}
.card:hover { border-color: var(--accent); }
.card-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
}
.card-title { font-family: var(--mono); font-size: 15px; font-weight: 700; color: var(--text); line-height: 1.3; word-break: break-word; }
.cat-chip {
  font-size: 10px;
  font-family: var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  background: var(--bg3);
  color: var(--text2);
  padding: 3px 8px;
  border-radius: 999px;
  white-space: nowrap;
}
.score-block {
  display: flex;
  align-items: baseline;
  gap: 12px;
}
.score-num {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 40px;
  line-height: 1;
}
.score-band {
  font-family: var(--mono);
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.score-num.ai-trivial, .score-band.ai-trivial { color: var(--red); }
.score-num.ai-easy, .score-band.ai-easy { color: var(--orange); }
.score-num.ai-contested, .score-band.ai-contested { color: var(--yellow); }
.score-num.ai-stretched, .score-band.ai-stretched { color: var(--accent); }
.score-num.ai-resistant, .score-band.ai-resistant { color: var(--green); }
.score-num.ai-error, .score-band.ai-error { color: var(--text3); }

.card-meta { font-family: var(--mono); font-size: 12px; color: var(--text2); }
.card-meta strong { color: var(--text); font-weight: 600; }

.card-actions { display: flex; gap: 8px; margin-top: 6px; }
.card-actions button {
  font-size: 12px;
  background: var(--bg3);
  color: var(--text2);
  border: 1px solid var(--border);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-family: inherit;
}
.card-actions button:hover { background: var(--bg4); color: var(--text); }
.card-transcript {
  display: none;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px;
  max-height: 360px;
  overflow: auto;
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--text2);
  white-space: pre-wrap;
  word-break: break-word;
}
.card-transcript.open { display: block; }

/* SUBMIT */
.submit-form {
  display: flex;
  flex-direction: column;
  gap: 14px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  max-width: 760px;
}
.submit-form label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text2);
}
.submit-form input[type="text"],
.submit-form select,
.submit-form textarea {
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--radius-sm);
  padding: 9px 11px;
  font-size: 13.5px;
  font-family: inherit;
}
.submit-form textarea {
  font-family: var(--mono);
  font-size: 13px;
  resize: vertical;
}
.submit-form input:focus, .submit-form select:focus, .submit-form textarea:focus {
  outline: none; border-color: var(--accent);
}
.submit-row { display: flex; align-items: center; gap: 12px; }
.error-text { color: var(--red); font-size: 13px; }
.run-view {
  margin-top: 18px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  max-width: 760px;
}
.run-view h3 { font-family: var(--mono); font-size: 16px; margin-bottom: 12px; }
.run-status {
  display: inline-block;
  font-family: var(--mono);
  font-size: 13px;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--bg3);
  color: var(--text2);
}
.run-status.solved { background: rgba(61,214,140,0.15); color: var(--green); }
.run-status.unsolved { background: rgba(255,140,90,0.15); color: var(--orange); }
.run-status.running { background: rgba(108,138,255,0.15); color: var(--accent); }
.run-status.error { background: rgba(240,98,146,0.15); color: var(--red); }

/* TABLES */
.table-wrap { overflow: auto; border: 1px solid var(--border); border-radius: var(--radius); }
.data-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.data-table th, .data-table td {
  text-align: left;
  padding: 11px 14px;
  border-bottom: 1px solid var(--border);
  font-family: var(--mono);
}
.data-table th {
  background: var(--bg2);
  color: var(--text2);
  font-weight: 600;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.data-table tbody tr:hover { background: var(--bg2); }
.data-table tbody tr:last-child td { border-bottom: none; }

.banner {
  background: rgba(255,202,98,0.1);
  border: 1px solid rgba(255,202,98,0.3);
  color: var(--yellow);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  margin-bottom: 14px;
  font-family: var(--mono);
}

.empty {
  text-align: center;
  color: var(--text3);
  font-family: var(--mono);
  padding: 40px 0;
}

/* TOAST */
.toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg3);
  color: var(--text);
  padding: 10px 18px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  font-family: var(--mono);
  font-size: 13px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s;
}
.toast.show { opacity: 1; }

@media (max-width: 800px) {
  .site-header { grid-template-columns: 1fr; gap: 12px; }
  .header-stats { justify-content: flex-start; }
  main { padding: 18px; }
  .tabs { padding: 0 18px; overflow-x: auto; }
}