:root {
  color-scheme: light;
  --bg: #f7f9fc;
  --header-bg: #ffffff;
  --card: #ffffff;
  --text: #1b2530;
  --muted: #4d5f73;
  --line: #d8e0ea;
  --accent: #0d6efd;
  --accent-soft: #eaf2ff;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #111827;
  --header-bg: #0f172a;
  --card: #1f2937;
  --text: #e5e7eb;
  --muted: #94a3b8;
  --line: #334155;
  --accent: #60a5fa;
  --accent-soft: #1e293b;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Noto Sans KR", "Apple SD Gothic Neo", sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, var(--header-bg) 0%, var(--bg) 280px);
  line-height: 1.65;
  font-size: 17px;
}

.container {
  width: min(1100px, 92%);
  margin: 0 auto;
}

header {
  padding: 44px 0 24px;
}

.header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
}

h1,
h2,
h3 {
  line-height: 1.35;
  margin: 0 0 10px;
}

h1 {
  font-size: clamp(1.7rem, 2.6vw, 2.5rem);
}

h2 {
  font-size: clamp(1.25rem, 2vw, 1.7rem);
}

.lead {
  color: var(--muted);
  max-width: 860px;
  margin: 0;
}

#theme-toggle {
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid var(--line);
  border-radius: 999px;
  font-weight: 700;
  padding: 9px 14px;
  cursor: pointer;
}

nav {
  margin-top: 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

nav a {
  text-decoration: none;
  color: var(--accent);
  border: 1px solid var(--line);
  background: var(--accent-soft);
  padding: 7px 12px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.92rem;
}

main {
  padding-bottom: 50px;
  max-width: 930px;
}

section {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 22px;
  margin-bottom: 16px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 12px;
}

.card {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px;
  background: var(--card);
}

.calc-article {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 18px;
  margin-top: 12px;
  background: var(--card);
}

.tool-box {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px;
  margin-top: 10px;
  background: var(--card);
}

.tool-box summary {
  cursor: pointer;
  font-weight: 700;
}

ul,
ol {
  margin: 10px 0 0;
  padding-left: 19px;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 10px;
  font-size: 0.95rem;
}

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

th {
  background: var(--accent-soft);
}

.small {
  color: var(--muted);
  font-size: 0.91rem;
}

.highlight {
  border-left: 4px solid var(--accent);
  padding-left: 10px;
  margin-top: 12px;
}

footer {
  border-top: 1px solid var(--line);
  padding: 24px 0 40px;
  color: var(--muted);
  font-size: 0.9rem;
}

after-tax-calculator,
part-time-pay-calculator,
salary-raise-simulator,
loan-repayment-calculator,
tax-saving-tips-ai,
annual-salary-calculator,
severance-pay-calculator,
loan-interest-calculator,
detailed-salary-calculator,
monthly-takehome-calendar,
job-offer-comparator,
exit-package-calculator,
refinance-comparator,
tax-checklist-manager,
result-export-tool,
regulation-update-banner {
  display: block;
  margin-top: 10px;
}

@media (max-width: 700px) {
  body {
    background: var(--bg);
    font-size: 16px;
  }

  header {
    padding-top: 30px;
  }

  .header-top {
    flex-direction: column;
    align-items: flex-start;
  }

  section {
    padding: 16px;
  }
}