:root {
  --bg: #0b0f14;
  --panel: #121822;
  --text: #e6eef8;
  --muted: #9db1c6;
  --accent: #4da3ff;
  --green: #26c281;
  --red: #ff5c5c;
  --border: #223041;
}
* {
  box-sizing: border-box;
}
html,
body {
  height: 100%;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, Segoe UI, Roboto, Apple SD Gothic Neo,
    Noto Sans KR, sans-serif;
}
.container {
  max-width: 900px;
  margin: 40px auto;
  padding: 0 16px;
}
.header h1 {
  margin: 0 0 6px 0;
}
.sub {
  color: var(--muted);
}
.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
}
.question {
  white-space: pre-wrap;
  font-size: 1.05rem;
  margin-bottom: 16px;
}
.image-wrap {
  margin: 10px 0 18px;
}
.image-wrap img {
  max-width: 100%;
  border-radius: 10px;
  border: 1px solid var(--border);
}
.choices {
  display: grid;
  gap: 10px;
  margin-top: 12px;
}
.choice {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.02);
}
.choice .choice-text {
  flex: 1;
  white-space: normal;
}
.choice:hover {
  border-color: var(--accent);
}
.choice .letter {
  background: rgba(77, 163, 255, 0.15);
  color: var(--accent);
  font-weight: 700;
  padding: 4px 9px;
  border-radius: 999px;
  min-width: 32px;
  text-align: center;
}
.choice input {
  transform: scale(1.1);
  margin: 0;
}
.feedback {
  min-height: 24px;
  margin-top: 12px;
  font-weight: 700;
}
.feedback.ok {
  color: var(--green);
}
.feedback.no {
  color: var(--red);
}
.actions {
  display: flex;
  gap: 10px;
  margin-top: 18px;
}
.btn {
  appearance: none;
  border: 1px solid var(--border);
  background: #182233;
  color: var(--text);
  padding: 10px 16px;
  border-radius: 12px;
  cursor: pointer;
}
.btn[disabled] {
  opacity: 0.5;
  cursor: not-allowed;
}
.btn.primary {
  background: var(--accent);
  border-color: transparent;
  color: #00122a;
  font-weight: 700;
}
.muted {
  color: var(--muted);
}
.small {
  font-size: 0.9rem;
}