:root {
  --bg: #f6f9fc;
  --card: #ffffff;
  --ink: #172534;
  --muted: #53687c;
  --line: #d8e2ec;
  --brand: #1463a6;
  --brand-2: #0f4b7d;
  --accent: #db8a22;
  --good: #1e7a4f;
  --warn: #b43d3d;
  --shadow: 0 8px 26px rgba(16, 35, 53, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Pretendard", "Noto Sans KR", "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  color: var(--ink);
  background: radial-gradient(circle at left top, #ecf5ff 0%, var(--bg) 48%, #f9fcf8 100%);
  line-height: 1.62;
}

.page {
  max-width: 1180px;
  margin: 0 auto;
  padding: 20px;
}

.hero {
  background: linear-gradient(130deg, #124f82 0%, #1e79be 60%, #53a3d8 100%);
  color: #fff;
  border-radius: 16px;
  padding: 22px;
  box-shadow: var(--shadow);
}

.hero h1 {
  margin: 0 0 8px;
  font-size: clamp(1.25rem, 2.2vw, 1.9rem);
  letter-spacing: -0.015em;
}

.hero p {
  margin: 0;
  opacity: 0.98;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.chip {
  display: inline-block;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.18);
  border: 1px solid rgba(255, 255, 255, 0.35);
  font-size: 0.82rem;
}

.layout {
  margin-top: 14px;
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 14px;
}

.sidebar {
  position: sticky;
  top: 14px;
  align-self: start;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 12px;
}

.sidebar h2 {
  margin: 2px 0 8px;
  font-size: 1rem;
  color: var(--brand-2);
}

.nav-link {
  display: block;
  text-decoration: none;
  color: var(--muted);
  padding: 6px 8px;
  border-radius: 8px;
  font-size: 0.91rem;
}

.nav-link:hover,
.nav-link.active {
  background: #eef6ff;
  color: var(--brand-2);
}

.content {
  display: grid;
  gap: 12px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 18px;
}

.card h2 {
  margin: 0 0 10px;
  padding-bottom: 8px;
  border-bottom: 2px solid #ebf2f8;
  font-size: 1.14rem;
  color: var(--brand-2);
}

.card h3 {
  margin-top: 16px;
  margin-bottom: 6px;
  font-size: 1rem;
  color: var(--brand);
}

p {
  margin: 0 0 8px;
}

ul,
ol {
  margin: 0;
  padding-left: 20px;
}

li {
  margin: 2px 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 8px;
  font-size: 0.9rem;
}

th, td {
  border: 1px solid var(--line);
  padding: 8px 9px;
  vertical-align: top;
  text-align: left;
}

th {
  background: #f0f6fd;
  color: #21435e;
}

.note {
  margin-top: 8px;
  border-left: 4px solid var(--accent);
  background: #fff8ef;
  color: #724d23;
  border-radius: 8px;
  padding: 9px 11px;
}

.quote {
  margin-top: 8px;
  border-left: 4px solid var(--brand);
  background: #f2f8ff;
  border-radius: 8px;
  padding: 9px 11px;
  color: #36506a;
}

.good {
  color: var(--good);
  font-weight: 700;
}

.bad {
  color: var(--warn);
  font-weight: 700;
}

.subgrid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.mini {
  border: 1px solid #dce8f4;
  border-radius: 10px;
  background: #f9fcff;
  padding: 10px;
  font-size: 0.9rem;
}

.q {
  border: 1px solid #d4e3f1;
  border-radius: 10px;
  background: #fbfdff;
  padding: 11px;
  margin-top: 9px;
}

.q-title {
  margin-bottom: 6px;
  font-weight: 700;
  color: #1a456a;
}

.q-open {
  padding: 12px;
}

.q-problem {
  margin-top: 0;
  margin-bottom: 8px;
}

.q-stem-box {
  margin-bottom: 8px;
  border: 1px solid #d8e5f2;
  border-radius: 8px;
  background: #f5f9ff;
  padding: 8px 10px;
}

.q-stem-item-list {
  margin: 0;
  padding-left: 0;
  list-style: none;
}

.q-stem-item-list li {
  display: flex;
  align-items: flex-start;
  gap: 7px;
  margin: 4px 0;
  line-height: 1.5;
}

.stem-key {
  min-width: 1.4rem;
  font-weight: 700;
  color: #1a456a;
}

.stem-text {
  flex: 1;
}

.q-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 8px;
}

.meta-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border-radius: 999px;
  border: 1px solid #cdddec;
  padding: 5px 10px;
  font-size: 0.78rem;
  line-height: 1.2;
  color: #244862;
  background: #f2f8ff;
}

.meta-pill strong {
  color: #133a5a;
}

.meta-pill.source {
  background: #eef6ff;
  border-color: #c7ddef;
}

.meta-pill.type {
  background: #edf8f1;
  border-color: #cbe8d6;
}

.meta-pill.table {
  background: #fff7ea;
  border-color: #f0d7b1;
}

.meta-sub {
  margin-top: 0;
  margin-bottom: 8px;
  font-size: 0.77rem;
  color: #5c7187;
}

.q-table-wrap {
  margin: 6px 0 8px;
  border: 1px solid #d9e7f4;
  border-radius: 8px;
  overflow-x: auto;
  background: #fff;
}

.q-table-wrap table {
  margin-top: 0;
  min-width: 520px;
}

.q-data-note {
  margin-top: 6px;
  margin-bottom: 8px;
  border-left: 3px solid #9ab6d3;
  background: #f4f9ff;
  border-radius: 6px;
  padding: 6px 8px;
  color: #38506a;
  font-size: 0.83rem;
}

.q-choice-box {
  margin-top: 8px;
  margin-bottom: 8px;
  border: 1px solid #d8e5f2;
  border-radius: 8px;
  background: #fff;
  padding: 7px 9px;
}

.q-choice-list {
  margin: 0;
  padding-left: 0;
  list-style: none;
}

.q-choice-list li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 5px 4px;
  border-bottom: 1px dashed #e0eaf4;
}

.q-choice-list li:last-child {
  border-bottom: 0;
}

.choice-no {
  min-width: 1.45rem;
  font-weight: 700;
  color: #1a456a;
}

.choice-text {
  flex: 1;
}

.term-box {
  margin-top: 6px;
  margin-bottom: 8px;
  border: 1px solid #d9e4ef;
  background: #f8fbff;
  border-radius: 8px;
  padding: 8px 9px;
}

.term-box p {
  margin: 0 0 4px;
}

.term-list {
  margin: 0;
  padding-left: 18px;
  font-size: 0.86rem;
}

.term-list li {
  margin: 3px 0;
}

.term-key {
  font-weight: 700;
  color: #163f61;
}

.term-syn {
  color: #4f6580;
}

.tag {
  display: inline-block;
  margin-right: 6px;
  font-size: 0.75rem;
  line-height: 1;
  padding: 5px 8px;
  border-radius: 999px;
  color: #fff;
  border: 1px solid transparent;
}

.tag.past {
  background: #356fa5;
  border-color: #255884;
}

.tag.rebuild {
  background: #7a5ba6;
  border-color: #61448c;
}

.tag.variant {
  background: #b96d22;
  border-color: #945114;
}

.answer {
  margin-top: 6px;
  background: #eef8f1;
  border: 1px solid #cde4d4;
  border-radius: 8px;
  padding: 7px 9px;
  color: #205137;
  font-weight: 700;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.btn {
  text-decoration: none;
  display: inline-block;
  padding: 7px 10px;
  border-radius: 9px;
  border: 1px solid #c7d8ea;
  color: #2e4b64;
  background: #f3f8fd;
  font-size: 0.86rem;
}

.btn:hover {
  background: #eaf3fc;
}

html.js-hardened,
html.js-hardened body {
  -webkit-touch-callout: none;
}

html.js-hardened body {
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

html.js-hardened input,
html.js-hardened textarea {
  -webkit-user-select: text;
  -moz-user-select: text;
  -ms-user-select: text;
  user-select: text;
}

.site-copyright {
  max-width: 1180px;
  margin: 14px auto 20px;
  padding: 10px 12px;
  font-size: 0.78rem;
  color: #4f6479;
  border-top: 1px solid #d8e2ec;
  text-align: center;
}

.donation-strip {
  max-width: 1180px;
  margin: 14px auto 0;
  padding: 0 12px;
}

.donation-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border: 1px solid #d8e4ef;
  border-radius: 12px;
  background: linear-gradient(120deg, #f8fcff 0%, #eef6ff 100%);
  box-shadow: var(--shadow);
  padding: 12px 14px;
}

.donation-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.donation-title {
  margin: 0;
  font-size: 0.92rem;
  font-weight: 700;
  color: #1b486c;
}

.donation-desc {
  margin: 0;
  font-size: 0.8rem;
  color: #4f6479;
}

.donation-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  border-radius: 10px;
  border: 1px solid #c8d9ea;
  background: #ffffff;
  color: #1e4f76;
  text-decoration: none;
  font-size: 0.83rem;
  font-weight: 700;
  white-space: nowrap;
}

.donation-btn:hover {
  background: #f2f8ff;
}

@media (max-width: 980px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
  }
}

@media (max-width: 720px) {
  .page {
    padding: 12px;
  }

  .hero {
    padding: 16px;
    border-radius: 12px;
  }

  .card {
    padding: 14px;
  }

  .subgrid {
    grid-template-columns: 1fr;
  }

  table {
    font-size: 0.84rem;
  }

  th,
  td {
    padding: 7px 8px;
  }

  .donation-panel {
    flex-direction: column;
    align-items: flex-start;
    padding: 11px 12px;
  }

  .donation-btn {
    width: 100%;
    justify-content: center;
  }
}