:root {
  --bg-start: #0f172a;
  --bg-end: #1f2937;
  --card-bg: rgba(255, 255, 255, 0.94);
  --text: #0b1324;
  --muted: #5b6475;
  --accent: #eb4d4b;
  --accent-dark: #c0392b;
  --ok: #1e8449;
  --warn: #c0392b;
  --hint: #2d5f9a;
  --border: rgba(17, 24, 39, 0.18);
  --shadow: 0 22px 48px rgba(15, 23, 42, 0.24);
  --font: "BIZ UDPGothic", "Hiragino Kaku Gothic ProN", "Yu Gothic UI", "Meiryo", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at 20% 10%, #223f77, transparent 38%),
    radial-gradient(circle at 80% 20%, #8f2c31, transparent 28%),
    linear-gradient(140deg, var(--bg-start), var(--bg-end));
  color: var(--text);
  font-family: var(--font);
}

.container {
  width: min(920px, calc(100% - 2rem));
  margin: 2rem auto 3rem;
  display: grid;
  gap: 1rem;
}

.hero,
.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow);
}

.hero {
  padding: 1.2rem 1.3rem;
}

.eyebrow {
  margin: 0;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--hint);
}

h1,
h2,
h3 {
  margin: 0;
}

h1 {
  margin-top: 0.45rem;
  font-size: clamp(1.4rem, 3vw, 2rem);
}

.description {
  margin: 0.6rem 0 0;
  color: var(--muted);
}

.meta-row {
  margin-top: 0.9rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem;
}

.dataset-meta {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.card {
  padding: 1rem 1.1rem;
}

.quiz-form {
  display: grid;
  gap: 0.45rem;
}

.quiz-form label {
  font-weight: 700;
}

.input-row,
.candidate-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.55rem;
}

input,
select,
button {
  font: inherit;
}

input,
select {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.65rem 0.75rem;
  background: #fff;
}

input:focus,
select:focus,
button:focus-visible {
  outline: 3px solid rgba(235, 77, 75, 0.2);
  border-color: var(--accent);
}

button {
  border: 0;
  border-radius: 10px;
  padding: 0.62rem 0.95rem;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  cursor: pointer;
  transition: background-color 0.15s ease, transform 0.15s ease;
}

button:hover {
  background: var(--accent-dark);
}

button:active {
  transform: translateY(1px);
}

.ghost-button {
  background: #f3f4f6;
  color: #111827;
  border: 1px solid var(--border);
}

.ghost-button:hover {
  background: #e5e7eb;
}

.candidate {
  margin-top: 0.85rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.75rem;
  background: #fff;
}

.candidate h3 {
  margin-bottom: 0.4rem;
}

.candidate-message {
  margin: 0 0 0.6rem;
  color: var(--muted);
  font-size: 0.94rem;
}

.result {
  margin-top: 0.85rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  padding: 0.85rem;
  line-height: 1.6;
  background: #fafafa;
}

.result h3 {
  margin-bottom: 0.4rem;
}

.result.exact {
  border-left: 5px solid var(--ok);
  background: #eefbf2;
}

.result.partial {
  border-left: 5px solid #b45309;
  background: #fffbeb;
}

.result.error {
  border-left: 5px solid var(--warn);
  background: #fff1f2;
}

.result.neutral {
  border-left: 5px solid var(--hint);
  background: #eff6ff;
}

.result ul {
  margin: 0.45rem 0 0;
  padding-left: 1rem;
}

.matched-question {
  margin: 0.6rem 0 0;
  color: #1f2937;
  font-size: 0.95rem;
}

.readonly-card p {
  margin: 0.45rem 0 0;
  color: var(--muted);
  line-height: 1.6;
}

.hidden {
  display: none;
}

.footer {
  color: #d1d5db;
  font-size: 0.92rem;
}

code,
kbd {
  background: #111827;
  color: #fff;
  border-radius: 6px;
  padding: 0.08rem 0.35rem;
  font-size: 0.85rem;
}

@media (max-width: 720px) {
  .container {
    width: min(920px, calc(100% - 1rem));
    margin: 1rem auto 1.8rem;
  }

  .input-row,
  .candidate-row {
    grid-template-columns: 1fr;
  }
}