:root {
  --ink: #11223f;
  --ink-soft: #38506f;
  --paper: #fff7e8;
  --paper-deep: #f3dfb7;
  --chalk: #fefdf8;
  --accent: #f26b3a;
  --mint: #69c3a3;
  --shadow: 0 24px 80px rgba(17, 34, 63, 0.18);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: ui-serif, Georgia, Cambria, "Times New Roman", serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 18% 18%, rgba(242, 107, 58, 0.20), transparent 26rem),
    radial-gradient(circle at 82% 12%, rgba(105, 195, 163, 0.24), transparent 22rem),
    linear-gradient(135deg, #fffaf0, var(--paper-deep));
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.35;
  background-image: linear-gradient(rgba(17, 34, 63, 0.045) 1px, transparent 1px), linear-gradient(90deg, rgba(17, 34, 63, 0.045) 1px, transparent 1px);
  background-size: 32px 32px;
}

.shell {
  width: min(980px, calc(100% - 32px));
  margin: 0 auto;
  padding: 48px 0;
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 32px;
  align-items: center;
}

.hero { padding: 20px; }
.eyebrow {
  margin: 0 0 14px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--accent);
  font-weight: 800;
}

h1 {
  margin: 0;
  font-size: clamp(3.2rem, 9vw, 6.8rem);
  line-height: 0.82;
  letter-spacing: -0.08em;
}

.intro {
  max-width: 30rem;
  color: var(--ink-soft);
  font-size: 1.2rem;
  line-height: 1.5;
}

.panel {
  position: relative;
  padding: 24px;
  border: 2px solid rgba(17, 34, 63, 0.18);
  border-radius: 34px;
  background: rgba(255, 253, 248, 0.78);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.panel::after {
  content: "∑";
  position: absolute;
  right: 22px;
  top: -34px;
  width: 68px;
  height: 68px;
  display: grid;
  place-items: center;
  border-radius: 22px;
  background: var(--ink);
  color: var(--paper);
  font-size: 2.2rem;
  transform: rotate(7deg);
  box-shadow: 0 16px 40px rgba(17, 34, 63, 0.25);
}

.controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: 16px;
}

label {
  display: grid;
  gap: 8px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

select, input, button {
  font: inherit;
  color: var(--ink);
}

select, input {
  width: 100%;
  border: 2px solid rgba(17, 34, 63, 0.18);
  border-radius: 18px;
  background: #fffdf8;
  padding: 14px 16px;
  outline: none;
}

select:focus, input:focus { border-color: var(--accent); box-shadow: 0 0 0 4px rgba(242, 107, 58, 0.16); }

.card {
  padding: 28px;
  border-radius: 28px;
  background: var(--ink);
  color: var(--chalk);
  overflow: hidden;
}

.card-topline, .scoreboard {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.78rem;
  color: rgba(254, 253, 248, 0.72);
}

.question {
  margin: 28px 0;
  text-align: center;
  font-size: clamp(4rem, 16vw, 7rem);
  line-height: 1;
  font-weight: 900;
  letter-spacing: -0.08em;
}

.answer-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
}

.answer-row input {
  border-color: transparent;
  font-size: 1.4rem;
  text-align: center;
}

button {
  border: 0;
  border-radius: 18px;
  padding: 14px 18px;
  background: var(--accent);
  color: white;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: transform 160ms ease, filter 160ms ease;
}

button:hover { transform: translateY(-1px); filter: brightness(1.04); }
button:active { transform: translateY(1px); }

.feedback {
  min-height: 1.5rem;
  margin: 16px 0 0;
  text-align: center;
  color: rgba(254, 253, 248, 0.82);
  font-size: 1.05rem;
}

.feedback.correct { color: #98f0c8; }
.feedback.wrong { color: #ffb199; }

.actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 16px 0;
}
.secondary { background: var(--mint); color: var(--ink); }
.ghost { background: transparent; color: var(--ink); border: 2px solid rgba(17, 34, 63, 0.18); }

.scoreboard {
  color: var(--ink-soft);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin: 0;
}

.scoreboard div {
  padding: 14px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.48);
}

dt { font-size: 0.68rem; }
dd { margin: 4px 0 0; font-size: 1.7rem; color: var(--ink); }

.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;
}

@media (max-width: 760px) {
  .shell { grid-template-columns: 1fr; padding: 28px 0; }
  .hero { padding: 6px; }
  .panel { padding: 18px; border-radius: 26px; }
  .controls, .actions { grid-template-columns: 1fr; }
  .answer-row { grid-template-columns: 1fr; }
}