:root {
  --bg: #eef2f6;
  --bg-soft: #f7f9fc;
  --surface: rgba(255, 255, 255, 0.92);
  --surface-strong: #ffffff;
  --border: rgba(133, 148, 168, 0.22);
  --border-strong: rgba(90, 108, 132, 0.28);
  --text: #142033;
  --muted: #64748b;
  --primary: #1d3557;
  --primary-soft: #e8eef8;
  --accent: #c26a3d;
  --accent-soft: #f7e5db;
  --ok: #1f7a5a;
  --ok-soft: #e5f6ef;
  --no: #b65443;
  --no-soft: #fde9e4;
  --neutral: #516173;
  --neutral-soft: #edf1f6;
  --shadow-lg: 0 22px 50px rgba(23, 36, 54, 0.1);
  --shadow-md: 0 12px 28px rgba(23, 36, 54, 0.08);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 16px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--text);
  font-family: "Pretendard Variable", "Pretendard", "SUIT Variable", "Noto Sans KR", "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(29, 53, 87, 0.08), transparent 24%),
    radial-gradient(circle at top right, rgba(194, 106, 61, 0.08), transparent 20%),
    linear-gradient(180deg, #f8fafc 0%, var(--bg) 42%, #edf3f8 100%);
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(rgba(255,255,255,0.38) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,0.34) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: linear-gradient(180deg, rgba(0,0,0,0.2), transparent 78%);
}
.shell {
  position: relative;
  width: min(1180px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 34px 0 120px;
}
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(340px, 0.9fr);
  gap: 18px;
  margin-bottom: 18px;
}
.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 0.84rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.hero h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.25rem);
  line-height: 1.04;
  letter-spacing: -0.03em;
}
.hero-copy {
  margin: 14px 0 0;
  max-width: 60ch;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.72;
}
.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.stat-card,
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(18px);
}
.stat-card {
  min-height: 132px;
  padding: 20px;
  display: grid;
  gap: 10px;
  align-content: start;
}
.stat-label {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
}
.stat-card strong {
  font-size: clamp(1.18rem, 2vw, 1.5rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
}
.controls {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 12px;
  padding: 18px;
  margin-bottom: 18px;
}
label {
  display: grid;
  gap: 8px;
  font-size: 0.88rem;
  font-weight: 800;
  color: #334155;
}
select,
button {
  height: 48px;
  border-radius: 14px;
  border: 1px solid var(--border);
  font: inherit;
}
select {
  padding: 0 14px;
  background: rgba(255, 255, 255, 0.96);
  color: var(--text);
  outline: none;
  transition: border-color 140ms ease, box-shadow 140ms ease, background-color 140ms ease;
}
select:focus {
  border-color: rgba(29, 53, 87, 0.35);
  box-shadow: 0 0 0 4px rgba(29, 53, 87, 0.08);
}
button {
  cursor: pointer;
  transition: transform 140ms ease, box-shadow 140ms ease, border-color 140ms ease, background-color 140ms ease;
}
button:hover { transform: translateY(-1px); }
.ghost-button,
.primary-button,
.answer-button,
.small-button,
.recommend-button {
  font-weight: 800;
  letter-spacing: -0.01em;
}
.ghost-button,
.small-button,
.recommend-button {
  background: linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
  color: var(--primary);
}
.primary-button {
  background: linear-gradient(135deg, #213a5b 0%, #28476f 100%);
  color: white;
  border-color: rgba(24, 43, 69, 0.45);
  padding: 0 18px;
  box-shadow: 0 10px 18px rgba(29, 53, 87, 0.18);
}
.primary-button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}
.recommendation-panel,
.question-panel,
.sidebar,
.review-panel {
  padding: 22px;
}
.trainer-grid,
.review-grid {
  display: grid;
  gap: 18px;
}
.trainer-grid {
  grid-template-columns: minmax(0, 1.55fr) minmax(300px, 0.82fr);
}
.review-grid {
  grid-template-columns: 1fr 1fr;
  margin-top: 18px;
}
.question-head,
.panel-head {
  display: flex;
  justify-content: space-between;
  gap: 14px;
}
.question-meta {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 700;
}
.question-text {
  margin: 0;
  max-width: 30ch;
  font-size: clamp(1.28rem, 2.1vw, 1.75rem);
  font-weight: 800;
  line-height: 1.62;
  letter-spacing: -0.02em;
}
.question-badges {
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: flex-end;
}
.badge,
.mini-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 35px;
  padding: 0 12px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 800;
  white-space: nowrap;
}
.badge { background: #edf3fb; color: var(--primary); }
.badge-soft { background: var(--accent-soft); color: var(--accent); }
.badge-neutral,
.mini-chip { background: var(--neutral-soft); color: var(--neutral); }
.answer-zone {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 30px;
}
.answer-button {
  height: 116px;
  font-size: clamp(2.1rem, 6vw, 3.25rem);
  border-width: 1px;
}
.answer-o {
  background: linear-gradient(180deg, #effcf6 0%, var(--ok-soft) 100%);
  color: var(--ok);
  border-color: rgba(31, 122, 90, 0.26);
}
.answer-x {
  background: linear-gradient(180deg, #fff4f2 0%, var(--no-soft) 100%);
  color: var(--no);
  border-color: rgba(182, 84, 67, 0.24);
}
.answer-button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
}
.result-panel {
  margin-top: 20px;
  padding: 18px;
  border-radius: 20px;
  background: #fff8f1;
  border: 1px solid #ecd8c5;
}
.result-panel.correct {
  background: #eef9f2;
  border-color: #b9ddc8;
}
.result-panel.incorrect {
  background: #fff2ef;
  border-color: #efc9c0;
}
.result-title,
.result-answer,
.result-explanation,
.sidebar h3,
.sidebar p,
.review-panel h3,
.recommendation-panel h3,
.recommendation-copy { margin: 0; }
.result-title {
  font-size: 1.05rem;
  font-weight: 900;
}
.result-answer {
  margin-top: 8px;
  font-weight: 800;
}
.result-explanation {
  margin-top: 8px;
  color: #334155;
  line-height: 1.72;
}
.question-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  margin-top: 20px;
}
.hidden { display: none; }
.sidebar {
  display: grid;
  gap: 16px;
  align-content: start;
}
.sidebar section,
.review-panel,
.recommendation-panel {
  display: grid;
  gap: 10px;
}
.sidebar h3,
.review-panel h3,
.recommendation-panel h3 {
  font-size: 1rem;
  letter-spacing: -0.01em;
}
.sidebar p,
.session-list,
.recommendation-copy,
.recommend-stats,
.review-item-note,
.review-item-meta {
  color: var(--muted);
  line-height: 1.68;
}
.session-list {
  margin: 0;
  padding-left: 18px;
}
.saved-status {
  font-size: 0.88rem;
  color: var(--primary);
}
.recommendation-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}
.recommend-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 18px;
  background: linear-gradient(180deg, rgba(255,255,255,0.95) 0%, rgba(246,249,253,0.92) 100%);
  display: grid;
  gap: 10px;
  box-shadow: var(--shadow-md);
}
.recommend-rank {
  font-size: 0.8rem;
  color: var(--accent);
  font-weight: 900;
  letter-spacing: 0.03em;
}
.recommend-title {
  font-size: 1rem;
  font-weight: 900;
  letter-spacing: -0.02em;
}
.review-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.review-item {
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 14px;
  background: linear-gradient(180deg, rgba(255,255,255,0.94) 0%, rgba(249,251,254,0.88) 100%);
  display: grid;
  gap: 8px;
}
.review-item-head {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: center;
}
.review-item-title {
  font-weight: 800;
  line-height: 1.58;
  color: var(--text);
}
.review-item-actions {
  display: flex;
  justify-content: flex-end;
}
.small-button,
.recommend-button {
  height: 38px;
  padding: 0 12px;
  border-radius: 12px;
}
.empty-note {
  color: var(--muted);
  padding: 6px 2px;
}
@media (max-width: 980px) {
  .hero,
  .trainer-grid,
  .review-grid,
  .controls,
  .recommendation-list { grid-template-columns: 1fr; }
  .hero-stats { grid-template-columns: repeat(3, 1fr); }
  .question-head { flex-direction: column; }
  .question-badges { align-items: flex-start; flex-direction: row; flex-wrap: wrap; }
  .question-text { max-width: none; }
}
@media (max-width: 640px) {
  .shell {
    width: min(100vw - 20px, 1120px);
    padding-top: 20px;
    padding-bottom: 176px;
  }
  .hero-stats,
  .answer-zone,
  .question-actions { grid-template-columns: 1fr; }
  .answer-zone,
  .question-actions { display: grid; }
  .hero h1 { font-size: 1.7rem; }
  .controls,
  .recommendation-panel,
  .question-panel,
  .sidebar,
  .review-panel { padding: 18px; }
  .answer-zone {
    position: fixed;
    left: 10px;
    right: 10px;
    bottom: 74px;
    z-index: 30;
    padding: 10px;
    border: 1px solid var(--border-strong);
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.96);
    box-shadow: 0 18px 32px rgba(17, 24, 39, 0.12);
    backdrop-filter: blur(14px);
  }
  .question-actions {
    position: fixed;
    left: 10px;
    right: 10px;
    bottom: 10px;
    z-index: 31;
    padding: 10px;
    border: 1px solid var(--border-strong);
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 18px 32px rgba(17, 24, 39, 0.12);
  }
  .answer-button {
    height: 80px;
    font-size: 2.3rem;
  }
  .question-panel { padding-bottom: 226px; }
}