:root {
  color-scheme: light;
  --bg: #ffffff;
  --surface: #ffffff;
  --surface-subtle: #f5f8f6;
  --ink: #202522;
  --muted: #68706b;
  --line: #d9dfdb;
  --line-strong: #bfc8c2;
  --accent: #276452;
  --accent-soft: #e7f0ec;
  --danger: #a43f3f;
  --radius: 8px;
  --content: 980px;
  font-family: Pretendard, "Noto Sans KR", "Apple SD Gothic Neo", "Malgun Gothic", system-ui, sans-serif;
  font-size: 16px;
}

* { box-sizing: border-box; }
html { background: var(--bg); color: var(--ink); }
body { margin: 0; min-width: 280px; font-size: 0.94rem; line-height: 1.55; }
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: #174b3d; }
a:focus-visible, summary:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible, button:focus-visible {
  outline: 3px solid rgba(39, 100, 82, 0.28);
  outline-offset: 2px;
}

.skip-link { position: fixed; z-index: 100; top: 8px; left: 8px; transform: translateY(-150%); padding: 8px 12px; background: var(--ink); color: white; border-radius: 6px; }
.skip-link:focus { transform: none; }

#head { position: sticky; z-index: 20; top: 0; border-bottom: 1px solid var(--line); background: rgba(255, 255, 255, 0.97); backdrop-filter: blur(8px); }
.site-header { width: min(var(--content), calc(100% - 32px)); min-height: 58px; margin: auto; display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.brand { display: flex; align-items: baseline; gap: 10px; color: var(--ink); text-decoration: none; white-space: nowrap; }
.brand strong { font-size: 1.05rem; letter-spacing: -0.03em; }
.brand span { color: var(--muted); font-size: 0.78rem; }
.site-nav { display: flex; align-items: center; gap: 4px; }
.site-nav > a, .tool-menu > summary { display: block; padding: 7px 10px; border-radius: 6px; color: var(--ink); font-size: 0.86rem; font-weight: 650; text-decoration: none; cursor: pointer; list-style: none; }
.tool-menu > summary::-webkit-details-marker { display: none; }
.tool-menu > summary::after { content: "▾"; padding-left: 6px; color: var(--muted); font-size: 0.72rem; }
.tool-menu[open] > summary, .site-nav > a:hover, .tool-menu > summary:hover { background: var(--accent-soft); color: var(--accent); }
.tool-menu { position: relative; }
.tool-menu-panel { position: absolute; right: 0; top: calc(100% + 7px); width: min(620px, calc(100vw - 24px)); display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; padding: 14px; border: 1px solid var(--line-strong); border-radius: var(--radius); background: var(--surface); box-shadow: 0 12px 30px rgba(30, 42, 35, 0.12); }
.tool-menu-panel section h2 { margin: 0 0 5px; padding: 0 7px 5px; border-bottom: 1px solid var(--line); color: var(--muted); font-size: 0.72rem; letter-spacing: 0.06em; }
.tool-menu-panel a { display: block; padding: 6px 7px; border-radius: 5px; color: var(--ink); font-size: 0.82rem; text-decoration: none; }
.tool-menu-panel a:hover { background: var(--accent-soft); color: var(--accent); }

.site-main { width: min(var(--content), calc(100% - 32px)); min-height: calc(100vh - 170px); margin: 22px auto 0; overflow-wrap: anywhere; }
.site-main > h2 { margin: 0 0 16px; padding-bottom: 9px; border-bottom: 2px solid var(--ink); font-size: clamp(1.25rem, 3vw, 1.65rem); line-height: 1.25; letter-spacing: -0.035em; }
.home-intro { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 24px; padding-bottom: 18px; border-bottom: 1px solid var(--line-strong); }
.home-intro h1 { margin: 2px 0 4px; font-size: clamp(1.45rem, 3vw, 2rem); line-height: 1.22; letter-spacing: -0.045em; }
.home-intro p { margin: 0; color: var(--muted); }
.eyebrow { color: var(--accent) !important; font-size: 0.7rem; font-weight: 750; letter-spacing: 0.12em; }
.history-note { flex: 0 0 auto; max-width: 440px; color: var(--muted); font-size: 0.78rem; }
.history-note summary { cursor: pointer; text-align: right; }
.history-note p { margin-top: 5px; }

.tool-section { margin: 0 0 24px; }
.section-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; margin-bottom: 8px; }
.section-heading h2 { margin: 0; font-size: 1rem; letter-spacing: -0.025em; }
.section-heading span { color: var(--muted); font-size: 0.76rem; }
.tool-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); border-top: 1px solid var(--line); }
.tool-link { min-width: 0; display: grid; grid-template-columns: minmax(145px, 0.85fr) 1.15fr; gap: 10px; padding: 10px 8px; border-bottom: 1px solid var(--line); color: var(--ink); text-decoration: none; }
.tool-link:nth-child(odd) { border-right: 1px solid var(--line); }
.tool-link strong { font-size: 0.88rem; letter-spacing: -0.02em; }
.tool-link span { align-self: center; color: var(--muted); font-size: 0.78rem; }
.tool-link:hover { background: var(--surface-subtle); color: var(--accent); }
.tool-link.featured strong::after { content: "추천"; display: inline-block; margin-left: 6px; padding: 1px 5px; border-radius: 999px; background: var(--accent-soft); color: var(--accent); font-size: 0.62rem; vertical-align: 1px; }

form { max-width: 100%; margin: 12px 0; }
input, select, textarea, button { max-width: 100%; border: 1px solid var(--line-strong); border-radius: 5px; background: var(--surface); color: var(--ink); font: inherit; }
input[type="text"], input[type="number"], input[type="date"], input[type="email"], select { min-height: 34px; padding: 5px 7px; }
input[type="text"] { width: 7rem; }
input.wide { width: 8rem; }
input.wider { width: 11rem; }
input[type="submit"], input[type="reset"], button { min-height: 36px; padding: 6px 12px; border-color: var(--accent); background: var(--accent); color: white; font-weight: 700; cursor: pointer; }
input[type="reset"] { border-color: var(--line-strong); background: var(--surface); color: var(--ink); }
input[type="file"] { padding: 5px; }
textarea { width: min(100% !important, 680px); min-height: 160px; padding: 8px; line-height: 1.45; resize: vertical; }
label { cursor: pointer; }
table { max-width: 100%; border-collapse: collapse; border-color: var(--line-strong); }
th, td { padding: 5px 7px; border-color: var(--line-strong); }
div.container { margin: 8px 0; padding: 10px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.alert { padding: 10px; border: 1px solid #e5c2c2; border-radius: var(--radius); background: #fff5f5; color: var(--danger); }
li { line-height: 1.7; }
.padding10 { padding: 10px; }
.vtop { vertical-align: top; }
table#iolTable td { line-height: 24px; }
table#iolTable td input { height: 30px; }
form#f input[type="text"] { width: 80px; }

.site-footer { width: min(var(--content), calc(100% - 32px)); margin: 42px auto 0; padding: 16px 0 24px; display: flex; justify-content: space-between; gap: 12px; border-top: 1px solid var(--line); color: var(--muted); font-size: 0.75rem; }
.site-footer a { color: inherit; }
.analytics-toggle { min-height: auto; padding: 0; border: 0; border-radius: 0; background: none; color: inherit; font-size: inherit; font-weight: inherit; text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }
.analytics-toggle:hover { color: var(--accent); }

@media (max-width: 720px) {
  :root { font-size: 16px; }
  .site-header, .site-main, .site-footer { width: min(100% - 24px, var(--content)); }
  .site-header { min-height: 54px; }
  .brand strong { font-size: 0.83rem; letter-spacing: -0.045em; }
  .brand span { display: none; }
  .site-nav > a { display: none; }
  .tool-menu-panel { position: fixed; top: 58px; right: 12px; left: 12px; width: auto; max-height: calc(100vh - 74px); grid-template-columns: 1fr; overflow-y: auto; }
  .tool-menu-panel section h2 { position: sticky; top: -14px; padding-top: 7px; background: var(--surface); }
  .home-intro { display: block; margin-bottom: 20px; }
  .history-note { margin-top: 12px; max-width: none; }
  .history-note summary { text-align: left; }
  .section-heading span { display: none; }
  .tool-grid { grid-template-columns: 1fr; }
  .tool-link { grid-template-columns: minmax(125px, 0.9fr) 1.1fr; padding: 10px 4px; }
  .tool-link:nth-child(odd) { border-right: 0; }
  .site-footer { margin-top: 30px; display: grid; }
  input[type="submit"], input[type="reset"], button, select { min-height: 40px; }
}

@media (max-width: 410px) {
  .tool-link { display: block; }
  .tool-link span { display: block; margin-top: 2px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; }
}