/* ─────────────────────────────────────────────
   개발자 도구 — 공통 스타일 (라이트/다크)
   ───────────────────────────────────────────── */
:root {
  --bg: #f6f8fa;
  --bg-elev: #ffffff;
  --bg-inset: #f0f2f5;
  --text: #1f2328;
  --text-dim: #57606a;
  --border: #d0d7de;
  --border-strong: #b6bec9;
  --brand: #2563eb;
  --brand-hover: #1d4ed8;
  --brand-soft: #dbeafe;
  --ok: #1a7f37;
  --err: #cf222e;
  --warn: #9a6700;
  --add-bg: #e6ffec; --add-tx: #1a7f37;
  --del-bg: #ffebe9; --del-tx: #cf222e;
  --hl: #fff8c5;
  --code-bg: #f0f2f5;
  --shadow: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --radius: 10px;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Apple SD Gothic Neo", "Malgun Gothic", "맑은 고딕", Roboto, sans-serif;
}
:root[data-theme="dark"] {
  --bg: #0d1117;
  --bg-elev: #161b22;
  --bg-inset: #0b0f14;
  --text: #e6edf3;
  --text-dim: #9198a1;
  --border: #30363d;
  --border-strong: #3d444d;
  --brand: #4493f8;
  --brand-hover: #58a6ff;
  --brand-soft: #163056;
  --ok: #3fb950;
  --err: #f85149;
  --warn: #d29922;
  --add-bg: #12261e; --add-tx: #3fb950;
  --del-bg: #2d1214; --del-tx: #f85149;
  --hl: #4a3d00;
  --code-bg: #0b0f14;
  --shadow: 0 1px 3px rgba(0,0,0,.5);
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { line-height: 1.3; }
.wrap { max-width: 1160px; margin: 0 auto; padding: 0 20px; }

/* ── 헤더 ── */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--bg-elev);
  border-bottom: 1px solid var(--border);
  backdrop-filter: saturate(1.4) blur(4px);
}
.header-inner { display: flex; align-items: center; gap: 16px; height: 58px; }
.logo { display: flex; align-items: center; gap: 8px; font-weight: 800; color: var(--text); font-size: 18px; flex: 0 0 auto; }
.logo:hover { text-decoration: none; }
.logo-mark { font-family: var(--mono); color: var(--brand); font-weight: 700; }
.header-search { position: relative; flex: 1 1 auto; max-width: 460px; }
.header-search input, .hero-search input {
  width: 100%; padding: 9px 14px; border: 1px solid var(--border);
  border-radius: 8px; background: var(--bg-inset); color: var(--text); font-size: 14px;
}
.header-search input:focus, .hero-search input:focus { outline: 2px solid var(--brand-soft); border-color: var(--brand); }
.search-results {
  position: absolute; top: calc(100% + 6px); left: 0; right: 0;
  background: var(--bg-elev); border: 1px solid var(--border); border-radius: 8px;
  box-shadow: var(--shadow); max-height: 60vh; overflow: auto; z-index: 60;
}
.search-results a { display: block; padding: 9px 14px; color: var(--text); border-bottom: 1px solid var(--border); }
.search-results a:last-child { border-bottom: 0; }
.search-results a:hover, .search-results a.active { background: var(--brand-soft); text-decoration: none; }
.search-results .sr-name { font-weight: 600; }
.search-results .sr-tag { color: var(--text-dim); font-size: 12px; }
.search-results .sr-empty { padding: 12px 14px; color: var(--text-dim); }

.header-nav { position: relative; flex: 0 0 auto; }
.nav-cats-btn, .theme-toggle {
  border: 1px solid var(--border); background: var(--bg-inset); color: var(--text);
  padding: 8px 12px; border-radius: 8px; cursor: pointer; font-size: 14px;
}
.nav-cats-btn:hover, .theme-toggle:hover { border-color: var(--border-strong); }
.nav-cats-menu {
  position: absolute; top: calc(100% + 6px); right: 0; width: 520px; max-width: 88vw;
  background: var(--bg-elev); border: 1px solid var(--border); border-radius: 10px;
  box-shadow: var(--shadow); padding: 14px; display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 14px; z-index: 60;
}
.nav-cat-title { font-weight: 700; font-size: 12px; color: var(--text-dim); margin-bottom: 6px; text-transform: uppercase; }
.nav-cat-group a { display: block; padding: 3px 0; font-size: 13.5px; color: var(--text); }
.theme-toggle { flex: 0 0 auto; }
.theme-toggle .theme-icon-dark { display: none; }
:root[data-theme="dark"] .theme-toggle .theme-icon-light { display: none; }
:root[data-theme="dark"] .theme-toggle .theme-icon-dark { display: inline; }

/* ── 랜딩 ── */
.main-home { padding: 28px 20px 60px; }
.hero { text-align: center; padding: 28px 0 20px; }
.hero h1 { font-size: 34px; margin: 0 0 12px; }
.hero-sub { max-width: 720px; margin: 0 auto 20px; color: var(--text-dim); font-size: 16px; }
.hero-search { max-width: 560px; margin: 0 auto; }
.hero-search input { padding: 13px 18px; font-size: 16px; }

.cat-section { margin-top: 34px; }
.cat-heading { display: flex; align-items: center; gap: 10px; font-size: 20px; margin: 0 0 14px; }
.cat-badge {
  display: inline-flex; align-items: center; justify-content: center; width: 30px; height: 30px;
  background: var(--brand-soft); color: var(--brand); border-radius: 8px; font-family: var(--mono); font-size: 13px; font-weight: 700;
}
.cat-desc { font-size: 13px; font-weight: 400; color: var(--text-dim); }
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 14px; }
.tool-card {
  display: block; background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px 18px; color: var(--text); transition: border-color .12s, transform .12s, box-shadow .12s;
}
.tool-card:hover { text-decoration: none; border-color: var(--brand); transform: translateY(-2px); box-shadow: var(--shadow); }
.tool-card h3 { margin: 0 0 4px; font-size: 16px; }
.card-tagline { margin: 0 0 8px; font-size: 13px; color: var(--brand); font-weight: 600; }
.card-desc { margin: 0; font-size: 13px; color: var(--text-dim); display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.no-results { text-align: center; color: var(--text-dim); padding: 40px 0; }

/* ── 도구 페이지 레이아웃 ── */
.main-tool { padding: 20px 20px 50px; }
.breadcrumb { font-size: 13px; color: var(--text-dim); margin-bottom: 10px; }
.breadcrumb a { color: var(--text-dim); }
.breadcrumb span { margin: 0 2px; }
.tool-head h1 { font-size: 26px; margin: 0 0 4px; }
.tool-tagline { color: var(--brand); font-weight: 600; margin: 0 0 18px; }
.tool-layout { display: grid; grid-template-columns: 1fr 300px; gap: 24px; align-items: start; }
.tool-aside { position: sticky; top: 74px; display: flex; flex-direction: column; gap: 16px; }
.aside-related { background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 16px; }
.aside-related h2 { font-size: 14px; margin: 0 0 8px; }
.aside-related ul { margin: 0; padding-left: 18px; }
.aside-related li { margin: 3px 0; font-size: 13.5px; }

/* ── 도구 UI 공통 ── */
.tool-panel { background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; margin-bottom: 16px; scroll-margin-top: 72px; }
input, textarea, select, button, .opt-row label { scroll-margin-top: 72px; }
.field-label { display: block; font-size: 13px; font-weight: 600; color: var(--text-dim); margin-bottom: 6px; }
.io-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 6px; gap: 8px; }
.io-head .field-label { margin-bottom: 0; }
textarea, .txt-input {
  width: 100%; min-height: 200px; resize: vertical; font-family: var(--mono); font-size: 13px;
  padding: 12px 14px; border: 1px solid var(--border); border-radius: 8px; background: var(--bg-inset); color: var(--text); line-height: 1.55;
}
textarea:focus, .txt-input:focus { outline: 2px solid var(--brand-soft); border-color: var(--brand); }
textarea.output, .output { background: var(--code-bg); }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 720px){ .two-col { grid-template-columns: 1fr; } }

.opt-row { display: flex; flex-wrap: wrap; align-items: center; gap: 14px 18px; margin: 4px 0 12px; }
.opt-row label { display: inline-flex; align-items: center; gap: 6px; font-size: 13.5px; cursor: pointer; }
.opt-row input[type="checkbox"], .opt-row input[type="radio"] { accent-color: var(--brand); width: 16px; height: 16px; }
select, input[type="text"], input[type="number"], input[type="search"] {
  font-family: var(--sans); font-size: 13.5px; padding: 7px 10px; border: 1px solid var(--border);
  border-radius: 7px; background: var(--bg-inset); color: var(--text);
}
select:focus, input:focus { outline: 2px solid var(--brand-soft); border-color: var(--brand); }

.btn-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0; }
.btn {
  display: inline-flex; align-items: center; gap: 6px; padding: 8px 16px; border-radius: 8px;
  border: 1px solid var(--border); background: var(--bg-inset); color: var(--text);
  font-size: 14px; font-weight: 600; cursor: pointer; font-family: var(--sans);
}
.btn:hover { border-color: var(--border-strong); }
.btn.primary { background: var(--brand); border-color: var(--brand); color: #fff; }
.btn.primary:hover { background: var(--brand-hover); }
.btn.ghost { background: transparent; }
.btn.sm { padding: 5px 11px; font-size: 12.5px; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

.copy-btn { padding: 5px 11px; font-size: 12.5px; }
.msg { font-size: 13px; margin: 8px 0; min-height: 1px; }
.msg.ok { color: var(--ok); }
.msg.err { color: var(--err); }
.msg.warn { color: var(--warn); }

.result-box {
  background: var(--code-bg); border: 1px solid var(--border); border-radius: 8px; padding: 12px 14px;
  font-family: var(--mono); font-size: 13px; white-space: pre-wrap; word-break: break-word; overflow: auto; max-height: 520px;
}
mark, .hl { background: var(--hl); color: inherit; border-radius: 2px; padding: 0 1px; }

/* stats grid */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(120px,1fr)); gap: 10px; }
.stat-cell { background: var(--bg-inset); border: 1px solid var(--border); border-radius: 8px; padding: 12px; text-align: center; }
.stat-cell .num { font-size: 24px; font-weight: 700; font-family: var(--mono); }
.stat-cell .lbl { font-size: 12px; color: var(--text-dim); }

table.data-table { border-collapse: collapse; width: 100%; font-size: 13px; }
table.data-table th, table.data-table td { border: 1px solid var(--border); padding: 6px 10px; text-align: left; }
table.data-table th { background: var(--bg-inset); }

/* diff */
.diff-line { font-family: var(--mono); font-size: 13px; white-space: pre-wrap; padding: 0 8px; }
.diff-add { background: var(--add-bg); color: var(--add-tx); }
.diff-del { background: var(--del-bg); color: var(--del-tx); }

/* markdown preview */
.md-preview { background: var(--bg-elev); border:1px solid var(--border); border-radius:8px; padding: 16px 18px; overflow:auto; max-height: 520px; }
.md-preview h1,.md-preview h2,.md-preview h3 { border-bottom: 1px solid var(--border); padding-bottom: 4px; }
.md-preview pre { background: var(--code-bg); padding: 12px; border-radius: 6px; overflow:auto; }
.md-preview code { background: var(--code-bg); padding: 1px 5px; border-radius: 4px; font-family: var(--mono); }
.md-preview table { border-collapse: collapse; } .md-preview th,.md-preview td { border:1px solid var(--border); padding:4px 8px; }
.md-preview blockquote { border-left: 4px solid var(--border); margin: 0; padding-left: 12px; color: var(--text-dim); }

/* color tool */
.color-preview { width: 100%; height: 90px; border-radius: 8px; border: 1px solid var(--border); }
.swatch-row { display:flex; gap:10px; align-items:center; flex-wrap: wrap; }

/* image tool */
.img-drop {
  border: 2px dashed var(--border-strong); border-radius: var(--radius); padding: 30px; text-align: center;
  color: var(--text-dim); cursor: pointer; background: var(--bg-inset);
}
.img-drop.drag { border-color: var(--brand); background: var(--brand-soft); }
.img-canvas-wrap { text-align:center; } .img-canvas-wrap canvas, .img-canvas-wrap img { max-width:100%; border:1px solid var(--border); border-radius:8px; background:#fff; }

/* ad slot */
.ad-slot { margin: 18px 0; text-align: center; min-height: 90px; }

/* ── 문서 페이지 ── */
.main-doc { padding: 28px 20px 60px; max-width: 820px; }
.main-doc h1 { font-size: 28px; }
.main-doc h2 { font-size: 20px; margin-top: 28px; }
.main-doc h3 { font-size: 16px; margin-top: 20px; }
.doc-updated, .doc-note { color: var(--text-dim); font-size: 13px; }

.tool-about { margin-top: 28px; padding-top: 20px; border-top: 1px solid var(--border); color: var(--text-dim); }
.tool-about h2 { font-size: 18px; color: var(--text); }
.tool-privacy-note { background: var(--bg-inset); border: 1px solid var(--border); border-radius: 8px; padding: 10px 14px; font-size: 13.5px; }

/* ── 도구 안내(guide) ── */
.tool-guide { margin-top: 22px; color: var(--text); max-width: 820px; }
.tool-guide h2 { font-size: 20px; color: var(--text); margin: 28px 0 10px; }
.tool-guide h2:first-child { margin-top: 4px; }
.tool-guide h3 { font-size: 16px; color: var(--text); margin: 22px 0 8px; }
.tool-guide p { margin: 0 0 12px; line-height: 1.75; }
.tool-guide ul, .tool-guide ol { margin: 0 0 14px; padding-left: 22px; }
.tool-guide li { margin: 5px 0; line-height: 1.7; }
.tool-guide code { background: var(--code-bg); border: 1px solid var(--border); border-radius: 4px; padding: 1px 5px; font-family: var(--mono); font-size: .88em; }
.tool-guide strong { color: var(--text); font-weight: 700; }

/* ── FAQ ── */
.tool-faq { margin-top: 34px; max-width: 820px; }
.tool-faq > h2 { font-size: 20px; color: var(--text); margin: 0 0 14px; }
.faq-item { border-top: 1px solid var(--border); padding: 14px 0; }
.faq-item:last-child { border-bottom: 1px solid var(--border); }
.faq-q { font-weight: 700; color: var(--text); margin: 0 0 6px; font-size: 15px; }
.faq-q::before { content: "Q. "; color: var(--brand); font-weight: 800; }
.faq-a { margin: 0; padding-left: 20px; color: var(--text-dim); line-height: 1.75; }

/* ── 푸터 ── */
.site-footer { border-top: 1px solid var(--border); background: var(--bg-elev); margin-top: 40px; padding: 28px 0 20px; }
.footer-inner { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.footer-brand { font-weight: 700; }
.footer-desc { font-weight: 400; font-size: 13px; color: var(--text-dim); max-width: 380px; margin: 6px 0 0; }
.footer-links { display: flex; gap: 18px; flex-wrap: wrap; align-items: flex-start; }
.footer-links a { color: var(--text-dim); font-size: 14px; }
.footer-copy { color: var(--text-dim); font-size: 12.5px; margin-top: 18px; }

/* ── 토스트 ── */
.toast {
  position: fixed; bottom: 26px; left: 50%; transform: translateX(-50%) translateY(20px);
  background: #24292f; color: #fff; padding: 10px 20px; border-radius: 8px; font-size: 14px;
  opacity: 0; pointer-events: none; transition: opacity .2s, transform .2s; z-index: 200; box-shadow: var(--shadow);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
:root[data-theme="dark"] .toast { background: #2f363d; }

/* ── 반응형 ── */
@media (max-width: 900px) {
  .tool-layout { grid-template-columns: 1fr; }
  .tool-aside { position: static; }
  .header-search { max-width: none; }
}
@media (max-width: 640px) {
  .header-inner { gap: 10px; }
  .logo-text { display: none; }
  .nav-cats-btn { display: none; }
  .hero h1 { font-size: 26px; }
  .nav-cats-menu { grid-template-columns: 1fr; }
}