:root {
  --ink: #0d1117;
  --ink-soft: #161b22;
  --paper: #f4ecd8;
  --paper-dim: #d9cfb8;
  --amber: #f0a830;
  --amber-bright: #ffc55a;
  --green: #4ade80;
  --red: #f87171;
  --rule: #2a2f3a;
  --shadow: rgba(0,0,0,0.4);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body {
  background: var(--ink);
  color: var(--paper);
  font-family: 'Fraunces', Georgia, serif;
  font-feature-settings: 'ss01', 'ss02';
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}
body {
  background:
    radial-gradient(ellipse at top, #1a2030 0%, var(--ink) 55%, #060a10 100%),
    var(--ink);
  padding: 24px 16px 80px;
  position: relative;
  overflow-x: hidden;
}
body::before {
  content: ""; position: fixed; inset: 0; pointer-events: none;
  background-image: repeating-linear-gradient(0deg,
    rgba(255,255,255,0.012) 0px, rgba(255,255,255,0.012) 1px,
    transparent 1px, transparent 3px);
  z-index: 1; mix-blend-mode: overlay;
}
.wrap { max-width: 720px; margin: 0 auto; position: relative; z-index: 2; }
header {
  display: flex; align-items: baseline; justify-content: space-between;
  padding-bottom: 18px; margin-bottom: 28px;
  border-bottom: 1px solid var(--rule); flex-wrap: wrap; gap: 12px;
}
.brand { display: flex; align-items: baseline; gap: 12px; }
.brand-mark {
  font-family: 'JetBrains Mono', monospace; font-size: 11px;
  letter-spacing: 0.18em; color: var(--amber); text-transform: uppercase;
  border: 1px solid var(--amber); padding: 3px 8px; border-radius: 2px;
}
h1 {
  font-family: 'Fraunces', serif;
  font-variation-settings: "opsz" 144, "wght" 400, "SOFT" 100, "WONK" 1;
  font-size: clamp(28px, 6vw, 42px); letter-spacing: -0.02em;
  line-height: 1; color: var(--paper);
}
h1 em {
  font-style: italic;
  font-variation-settings: "opsz" 144, "wght" 300, "SOFT" 100, "WONK" 1;
  color: var(--amber);
}
.subtitle {
  font-family: 'JetBrains Mono', monospace; font-size: 11px;
  letter-spacing: 0.15em; color: var(--paper-dim);
  text-transform: uppercase; opacity: 0.7;
}
.stats {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px;
  background: var(--rule); border: 1px solid var(--rule);
  margin-bottom: 24px; border-radius: 4px; overflow: hidden;
}
.stat { background: var(--ink-soft); padding: 14px 12px;
  display: flex; flex-direction: column; gap: 4px; }
.stat-label {
  font-family: 'JetBrains Mono', monospace; font-size: 9.5px;
  letter-spacing: 0.18em; color: var(--paper-dim);
  text-transform: uppercase; opacity: 0.65;
}
.stat-value {
  font-family: 'JetBrains Mono', monospace; font-size: 20px;
  font-weight: 500; color: var(--amber); letter-spacing: 0.02em;
}
.stat-value .total { color: var(--paper-dim); font-size: 14px; opacity: 0.6; }
.filter-row { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 18px; }
.filter-chip {
  font-family: 'JetBrains Mono', monospace; font-size: 10px;
  letter-spacing: 0.1em; text-transform: uppercase;
  background: transparent; color: var(--paper-dim);
  border: 1px solid var(--rule); padding: 6px 10px;
  border-radius: 2px; cursor: pointer; transition: all 0.15s ease;
}
.filter-chip:hover { border-color: var(--amber); color: var(--paper); }
.filter-chip.active {
  background: var(--amber); color: var(--ink);
  border-color: var(--amber); font-weight: 700;
}
.card {
  background: var(--ink-soft); border: 1px solid var(--rule);
  border-radius: 6px; padding: 28px 26px 24px;
  box-shadow: 0 8px 30px var(--shadow); position: relative;
  min-height: 380px; display: flex; flex-direction: column;
  transition: opacity 0.18s ease, transform 0.18s ease;
}
.card.fade { opacity: 0; transform: translateY(8px); }
.card::before {
  content: ""; position: absolute; top: 12px; right: 12px;
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--amber); box-shadow: 0 0 12px var(--amber);
  animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 0.4; } 50% { opacity: 1; }
}
.card-meta {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 18px; padding-bottom: 14px;
  border-bottom: 1px dashed var(--rule);
}
.category-tag {
  font-family: 'JetBrains Mono', monospace; font-size: 10px;
  letter-spacing: 0.16em; text-transform: uppercase; color: var(--amber);
}
.question-num {
  font-family: 'JetBrains Mono', monospace; font-size: 11px;
  color: var(--paper-dim); opacity: 0.7;
}
.question {
  font-family: 'Fraunces', serif;
  font-variation-settings: "opsz" 96, "wght" 400, "SOFT" 50;
  font-size: clamp(18px, 4vw, 22px); line-height: 1.4;
  color: var(--paper); margin-bottom: 22px; letter-spacing: -0.01em;
}
.options { display: flex; flex-direction: column; gap: 8px; margin-bottom: 16px; }
.option {
  background: transparent; border: 1px solid var(--rule); color: var(--paper);
  padding: 12px 16px; text-align: left; border-radius: 4px;
  cursor: pointer; font-family: 'Fraunces', serif; font-size: 15px;
  line-height: 1.4; transition: all 0.18s ease;
  display: flex; gap: 12px; align-items: flex-start; width: 100%;
}
.option:hover:not(:disabled) {
  border-color: var(--amber); background: rgba(240, 168, 48, 0.06);
}
.option:disabled { cursor: default; }
.option-letter {
  font-family: 'JetBrains Mono', monospace; font-size: 11px;
  font-weight: 700; letter-spacing: 0.1em; color: var(--amber);
  flex-shrink: 0; padding-top: 3px; min-width: 18px;
}
.option.correct {
  border-color: var(--green); background: rgba(74, 222, 128, 0.1);
}
.option.correct .option-letter { color: var(--green); }
.option.incorrect {
  border-color: var(--red); background: rgba(248, 113, 113, 0.08);
}
.option.incorrect .option-letter { color: var(--red); }
.option.faded { opacity: 0.4; }
.feedback {
  font-family: 'JetBrains Mono', monospace; font-size: 11px;
  letter-spacing: 0.1em; text-transform: uppercase;
  border-radius: 3px; margin-bottom: 14px; opacity: 0;
  transform: translateY(-4px); transition: all 0.2s ease;
  pointer-events: none; height: 0; overflow: hidden;
  padding: 0 14px;
}
.feedback.show {
  opacity: 1; transform: translateY(0); height: auto;
  padding: 10px 14px;
}
.feedback.correct {
  background: rgba(74, 222, 128, 0.1); color: var(--green);
  border-left: 3px solid var(--green);
}
.feedback.incorrect {
  background: rgba(248, 113, 113, 0.08); color: var(--red);
  border-left: 3px solid var(--red);
}
.controls {
  display: flex; gap: 8px; margin-top: auto;
  padding-top: 16px; border-top: 1px dashed var(--rule);
}
.btn {
  flex: 1; background: transparent; border: 1px solid var(--rule);
  color: var(--paper); padding: 10px 14px; border-radius: 3px;
  cursor: pointer; font-family: 'JetBrains Mono', monospace;
  font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase;
  transition: all 0.15s ease; font-weight: 500;
}
.btn:hover { border-color: var(--amber); color: var(--amber); }
.btn.primary {
  background: var(--amber); color: var(--ink);
  border-color: var(--amber); font-weight: 700;
}
.btn.primary:hover {
  background: var(--amber-bright); border-color: var(--amber-bright);
  color: var(--ink);
}
.btn:disabled { opacity: 0.3; cursor: not-allowed; }
.complete { text-align: center; padding: 40px 20px; }
.complete-score {
  font-family: 'Fraunces', serif;
  font-variation-settings: "opsz" 144, "wght" 400, "SOFT" 100, "WONK" 1;
  font-size: 64px; color: var(--amber); line-height: 1;
  margin-bottom: 8px; letter-spacing: -0.04em;
}
.complete-score em {
  font-style: italic;
  font-variation-settings: "opsz" 144, "wght" 300, "SOFT" 100, "WONK" 1;
  color: var(--paper-dim); font-size: 32px;
}
.complete-label {
  font-family: 'JetBrains Mono', monospace; font-size: 11px;
  letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--paper-dim); margin-bottom: 24px;
}
.complete-message {
  font-family: 'Fraunces', serif; font-size: 18px;
  line-height: 1.5; margin-bottom: 28px; color: var(--paper);
}
.foot {
  text-align: center; margin-top: 28px;
  font-family: 'JetBrains Mono', monospace; font-size: 10px;
  letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--paper-dim); opacity: 0.4;
}
.card-loading {
  display: flex; align-items: center; justify-content: center;
  flex: 1; opacity: 0.5;
  font-family: 'JetBrains Mono', monospace; font-size: 11px;
  letter-spacing: 0.14em; text-transform: uppercase;
}
.card-error {
  display: flex; align-items: center; justify-content: center;
  flex: 1; color: var(--red);
  font-family: 'JetBrains Mono', monospace; font-size: 11px;
  letter-spacing: 0.14em; text-transform: uppercase;
}