/* Sign PDF 공통 스타일
   색상은 모두 토큰으로 정의하고 다크 모드에서 다시 지정한다.
   PDF 미리보기와 서명 패드는 '종이'라서 다크 모드에서도 흰색을 유지한다. */
:root {
  color-scheme: light dark;
  --bg: #f5f6fa; --card: #ffffff; --foreground: #1a1a2e; --muted: #5b6075;
  --border: #d6d9e3; --border-strong: #b8bdcf;
  --accent: #3563e9; --accent-text: #2a55d6; --accent-soft: #3563e91f;
  --go: #15803d; --ok: #15803d; --danger: #b91c1c;
  --warn-bg: #d9770614; --warn-border: #d9770650;
  --stage: #eceef4; --paper: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1117; --card: #181b24; --foreground: #e6e8ef; --muted: #a0a6b8;
    --border: #2c3140; --border-strong: #3c4254;
    --accent-text: #8fb0ff; --accent-soft: #5b8cff29;
    --ok: #4ade80; --danger: #f87171;
    --warn-bg: #f59e0b14; --warn-border: #f59e0b45;
    --stage: #0b0d12;
  }
}
* { box-sizing: border-box; }
body { font-family: -apple-system, "Apple SD Gothic Neo", "Malgun Gothic", "Segoe UI", sans-serif; background: var(--bg); color: var(--foreground); margin: 0; line-height: 1.55; }
a { color: var(--accent-text); }
[hidden] { display: none !important; }
.wrap { max-width: 1060px; margin: 0 auto; padding: 24px 20px 0; }

/* ---- 헤더·푸터 ---- */
.site-header { background: var(--card); border-bottom: 1px solid var(--border); }
.site-header .inner { max-width: 1060px; margin: 0 auto; padding: 14px 20px; display: flex; align-items: center; gap: 6px 20px; flex-wrap: wrap; }
.brand { display: inline-flex; align-items: center; gap: 9px; font-weight: 800; font-size: 1.2rem; color: var(--foreground); text-decoration: none; }
.brand svg { width: 30px; height: 30px; flex: none; }
.site-nav { display: flex; gap: 4px; margin-left: auto; flex-wrap: wrap; }
.site-nav a { padding: 8px 14px; border-radius: 8px; font-size: 1rem; font-weight: 500; color: var(--foreground); text-decoration: none; }
.site-nav a:hover { color: var(--foreground); background: var(--accent-soft); }
.site-nav a[aria-current="page"] { color: var(--accent-text); font-weight: 600; }
@media (max-width: 480px) {
  .site-nav { margin-left: -8px; width: calc(100% + 8px); gap: 0; }
  .site-nav a { padding: 6px 8px; font-size: 0.92rem; }   /* 메뉴 4개가 한 줄에 들어가게 */
}
.site-footer { margin-top: 56px; border-top: 1px solid var(--border); color: var(--muted); font-size: 0.82rem; }
.site-footer .inner { max-width: 1060px; margin: 0 auto; padding: 20px 20px 40px; display: flex; flex-wrap: wrap; gap: 8px 20px; justify-content: space-between; }
.site-footer p { margin: 0; }
.site-footer nav { display: flex; gap: 14px; flex-wrap: wrap; }
.site-footer a { color: var(--muted); }
.site-footer a:hover { color: var(--foreground); }

/* ---- 도구 페이지: 첫 화면(파일 선택 전) — 큰 제목, 한 문장, 큰 버튼 하나 ---- */
.hero { text-align: center; padding: 56px 16px 64px; border-radius: 18px; }
.hero h1 { font-size: 2.75rem; line-height: 1.2; letter-spacing: -0.01em; margin: 0 0 14px; }
.hero .sub { font-size: 1.15rem; line-height: 1.65; color: var(--muted); max-width: 640px; margin: 0 auto 32px; }
.btn.huge { font-size: 1.5rem; padding: 20px 60px; border-radius: 14px; box-shadow: 0 12px 32px rgba(53, 99, 233, 0.35); }
.btn.huge:hover { background: #2a55d6; border-color: #2a55d6; }
.hero .alt { margin: 18px 0 0; font-size: 0.95rem; color: var(--muted); }
.hero .status { margin: 10px auto 0; max-width: 560px; font-size: 0.9rem; min-height: 1.4em; }
.hero .trust { display: inline-flex; align-items: center; gap: 7px; margin: 28px 0 0; padding: 7px 14px; border: 1px solid var(--border); border-radius: 999px; background: var(--card); font-size: 0.85rem; color: var(--muted); }
.hero .trust svg { width: 15px; height: 15px; flex: none; }
.hero.over { outline: 3px dashed var(--accent); outline-offset: -10px; background: var(--accent-soft); }
@media (max-width: 600px) {
  .hero { padding: 36px 8px 44px; }
  .hero h1 { font-size: 2rem; }
  .hero .sub { font-size: 1.02rem; margin-bottom: 26px; }
  .btn.huge { width: 100%; max-width: 420px; font-size: 1.25rem; padding: 18px 24px; }
}
/* ---- 도구 페이지: 작업 화면(파일 선택 후) ---- */
.filebar { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin: 0 0 14px; }
.filebar .fileinfo { font-weight: 600; }
.btn.small { padding: 6px 12px; font-size: 0.82rem; }
.grid { display: grid; grid-template-columns: 340px minmax(0, 1fr); gap: 18px; align-items: start; }
@media (max-width: 900px) { .grid { grid-template-columns: minmax(0, 1fr); } }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 16px 18px; }
.card + .card, .sig-list + .card { margin-top: 14px; }
.card h2 { font-size: 0.98rem; margin: 0 0 12px; }
.card h2 .h2sub { font-weight: 400; font-size: 0.85rem; color: var(--muted); }
.field { margin-top: 12px; }
.field label { display: block; font-size: 0.8rem; color: var(--muted); margin-bottom: 3px; }
/* 16px 미만이면 iPhone이 입력할 때 화면을 확대해 버린다 */
input[type=text], select { width: 100%; padding: 8px 10px; font: inherit; font-size: 1rem; border: 1px solid var(--border-strong); border-radius: 8px; background: var(--card); color: var(--foreground); }
input[type=text]:disabled { opacity: 0.5; }
.btnrow { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 8px; align-items: center; }
.btn { display: inline-block; padding: 8px 15px; font: inherit; font-size: 0.87rem; font-weight: 600; border-radius: 9px; border: 1px solid var(--accent); background: var(--accent); color: #fff; cursor: pointer; text-decoration: none; }
.btn.ghost { background: transparent; color: var(--foreground); border-color: var(--border-strong); }
.btn.green { background: var(--go); border-color: var(--go); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }
.btn:focus-visible, input:focus-visible, select:focus-visible, .sig-chip:focus-visible,
.iconbtn:focus-visible, .pagethumb:focus-visible, summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.hint { font-size: 0.75rem; color: var(--muted); margin: 4px 0 0; }
.okmsg { color: var(--ok); font-weight: 600; font-size: 0.85rem; margin: 8px 0 0; min-height: 1.4em; }
.okmsg.err { color: var(--danger); }
.hint.err { color: var(--danger); font-weight: 600; font-size: 0.8rem; }
.warn { background: var(--warn-bg); border: 1px solid var(--warn-border); border-radius: 10px; padding: 8px 12px; font-size: 0.8rem; margin: 12px 0 0; }
.toolbar { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.toolbar .spacer { flex: 1 1 auto; }

/* ---- 서명: 서명 패드·저장된 서명 ---- */
canvas.pen { display: block; width: 100%; height: 150px; border: 1.5px dashed var(--border-strong); border-radius: 10px; touch-action: none; cursor: crosshair; background: var(--paper); }
.savedh { font-size: 0.85rem; font-weight: 600; margin: 14px 0 6px; color: var(--muted); }
.sig-list { display: flex; flex-wrap: wrap; gap: 8px; }
.sig-chip { border: 1px solid var(--border); border-radius: 10px; padding: 6px 8px; background: var(--card); color: var(--foreground); cursor: pointer; display: flex; gap: 8px; align-items: center; }
/* 서명 잉크가 어두운 색이라 썸네일 바탕은 다크 모드에서도 밝게 */
.sig-chip img { height: 28px; max-width: 120px; object-fit: contain; display: block; background: #fff repeating-conic-gradient(#0001 0 25%, transparent 0 50%) 0 0/10px 10px; border-radius: 4px; }
.sig-chip span { font-size: 0.78rem; }
.sig-chip .del { border: none; background: none; color: var(--danger); cursor: pointer; font-size: 0.9rem; padding: 0 4px; }
.sig-chip.active { border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent-soft); }

/* ---- 서명: 배치 스테이지 ---- */
.pagepick { display: flex; align-items: center; gap: 6px; font-size: 0.85rem; color: var(--muted); }
.pagepick select { width: auto; padding: 6px 8px; }
/* 겹침(글자 앞/뒤) 선택: 라디오를 버튼 묶음처럼 보이게 */
.seg { display: inline-flex; align-items: center; gap: 6px; margin: 0; padding: 0; border: 0; min-width: 0; font-size: 0.85rem; color: var(--muted); }
.seg-opts { display: inline-flex; border: 1px solid var(--border-strong); border-radius: 8px; overflow: hidden; background: var(--card); }
.seg label { position: relative; cursor: pointer; }
.seg label + label { border-left: 1px solid var(--border-strong); }
.seg input { position: absolute; opacity: 0; width: 0; height: 0; }
.seg label span { display: block; padding: 6px 10px; color: var(--muted); }
.seg input:checked + span { background: var(--accent-soft); color: var(--accent-text); font-weight: 600; }
.seg input:focus-visible + span { outline: 2px solid var(--accent); outline-offset: -2px; }
/* isolation: 서명의 혼합(multiply)이 미리보기 종이 안에서만 계산되게 */
.pdfstage { position: relative; margin-top: 10px; border: 1px solid var(--border); border-radius: 10px; overflow: hidden; background: var(--stage); isolation: isolate; }
.pdfstage.over { outline: 2px dashed var(--accent); outline-offset: -4px; }
.pdfstage canvas { display: block; width: 100%; cursor: crosshair; }
.stamps { position: absolute; left: 0; top: 0; width: 100%; height: 100%; }
.stamp { position: absolute; cursor: grab; touch-action: none; user-select: none; -webkit-user-select: none; }
.stamp:active { cursor: grabbing; }
.stamp img { display: block; width: 100%; height: auto; pointer-events: none; }
/* 글자 뒤 모드: 내려받을 PDF와 같은 곱하기 혼합으로 미리 보여 준다 */
.stamps.behind .stamp img { mix-blend-mode: multiply; }
/* 서명 조작 핸들은 흰 종이(PDF) 위에 놓이므로 모드와 상관없이 고정 색 */
.stamp .selbox { position: absolute; inset: -3px; border: 1.5px dashed #3563e9; border-radius: 4px; pointer-events: none; }
.stamp .rz { position: absolute; right: -7px; bottom: -7px; width: 15px; height: 15px; background: #3563e9; border: 2px solid #fff; border-radius: 50%; cursor: nwse-resize; box-shadow: 0 1px 3px #0006; }
.stamp .rm { position: absolute; right: -11px; top: -11px; width: 20px; height: 20px; border: none; border-radius: 50%; background: #b91c1c; color: #fff; font-size: 12px; line-height: 1; cursor: pointer; box-shadow: 0 1px 3px #0006; display: flex; align-items: center; justify-content: center; }
.stamp .rm:hover { background: #7f1010; }
/* 터치 화면: 손가락으로 잡기 쉽게 보이지 않는 터치 영역을 넓힌다 */
@media (pointer: coarse) {
  .stamp .rz::before, .stamp .rm::before { content: ""; position: absolute; inset: -12px; }
}
.kbd { font-size: 0.75rem; color: var(--muted); margin-top: 4px; display: flex; gap: 8px; flex-wrap: wrap; }
.kbd span { border: 1px solid var(--border); border-radius: 6px; padding: 2px 8px; background: var(--card); }

/* ---- 합치기: 파일 목록 ---- */
.tool { max-width: 860px; }
.filelist { list-style: none; padding: 0; margin: 12px 0 0; display: grid; gap: 8px; }
.fileitem { display: flex; align-items: center; gap: 10px; padding: 8px 10px; border: 1px solid var(--border); border-radius: 10px; background: var(--card); }
.fileitem .order { flex: none; width: 1.6em; text-align: center; font-weight: 700; color: var(--accent-text); }
.fileitem canvas { flex: none; width: 42px; border: 1px solid var(--border); border-radius: 4px; background: var(--paper); }
.fileitem .info { flex: 1 1 auto; min-width: 0; }
.fileitem .name { font-size: 0.9rem; font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.fileitem .pages { font-size: 0.78rem; color: var(--muted); }
.iconbtn { flex: none; width: 36px; height: 36px; border: 1px solid var(--border-strong); border-radius: 8px; background: transparent; color: var(--foreground); font: inherit; font-size: 0.95rem; cursor: pointer; }
.iconbtn:disabled { opacity: 0.3; cursor: default; }
.iconbtn.danger { color: var(--danger); }
.summary { font-size: 0.85rem; color: var(--muted); }
.tool .toolbar { margin-top: 12px; }

/* ---- 나누기: 모드·페이지 썸네일 ---- */
.modes { display: grid; gap: 8px; margin: 0; padding: 0; border: none; }
.modes legend { font-size: 0.8rem; color: var(--muted); margin-bottom: 4px; padding: 0; }
.modes label { display: flex; gap: 8px; align-items: flex-start; font-size: 0.92rem; cursor: pointer; }
.modes input { margin-top: 0.3em; }
.thumbgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(104px, 1fr)); gap: 12px; margin-top: 14px; }
.pagethumb { position: relative; padding: 6px; border: 2px solid var(--border); border-radius: 10px; background: var(--card); color: var(--foreground); font: inherit; cursor: pointer; }
.pagethumb canvas { display: block; width: 100%; height: auto; background: var(--paper); border-radius: 4px; }
.pagethumb .no { display: block; margin-top: 4px; font-size: 0.78rem; color: var(--muted); text-align: center; }
.pagethumb[aria-pressed="true"] { border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent-soft); }
.pagethumb[aria-pressed="true"]::after { content: "✓"; position: absolute; top: 10px; right: 10px; width: 22px; height: 22px; border-radius: 50%; background: var(--accent); color: #fff; font-size: 0.8rem; display: grid; place-items: center; }

/* ---- 설명 글(가이드·정책·도구 아래 안내) ---- */
.content { margin-top: 44px; }
.prose { max-width: 760px; }
.prose h1 { font-size: 1.6rem; line-height: 1.35; margin: 0 0 8px; }
.prose h2 { font-size: 1.2rem; line-height: 1.4; margin: 36px 0 10px; }
.prose h3 { font-size: 1.02rem; margin: 24px 0 6px; }
.prose p, .prose li { font-size: 1rem; line-height: 1.8; }
.prose ul, .prose ol { padding-left: 1.3em; }
.prose li + li { margin-top: 4px; }
.prose .meta { color: var(--muted); font-size: 0.85rem; margin: 0 0 20px; }
.prose .lead { font-size: 1.05rem; color: var(--muted); }
.prose blockquote { margin: 14px 0; padding: 10px 14px; border-left: 3px solid var(--accent); background: var(--card); border-radius: 0 8px 8px 0; }
.prose blockquote p { margin: 0; }
.prose blockquote cite { display: block; margin-top: 4px; font-size: 0.82rem; font-style: normal; color: var(--muted); }
.prose table { border-collapse: collapse; width: 100%; font-size: 0.92rem; margin: 12px 0; }
.prose th, .prose td { border: 1px solid var(--border); padding: 8px 10px; text-align: left; vertical-align: top; }
.prose th { background: var(--card); }
.prose code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.9em; background: var(--accent-soft); padding: 1px 5px; border-radius: 4px; }
.prose .note { background: var(--warn-bg); border: 1px solid var(--warn-border); border-radius: 10px; padding: 10px 14px; font-size: 0.92rem; }
.table-scroll { overflow-x: auto; }
.faq details { border: 1px solid var(--border); border-radius: 10px; background: var(--card); padding: 10px 14px; }
.faq details + details { margin-top: 8px; }
.faq summary { cursor: pointer; font-weight: 600; }
.faq details p { margin: 8px 0 0; }
.cardlinks { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 12px; padding: 0; margin: 12px 0 0; list-style: none; }
.cardlinks li + li { margin-top: 0; }
.cardlinks a { display: block; height: 100%; padding: 14px 16px; border: 1px solid var(--border); border-radius: 12px; background: var(--card); color: var(--foreground); text-decoration: none; }
.cardlinks a:hover { border-color: var(--accent); }
.cardlinks b { display: block; margin-bottom: 4px; }
.cardlinks span { display: block; font-size: 0.85rem; line-height: 1.6; color: var(--muted); }

/* ---- 광고 자리: assets/ads.js가 채운다. 설정 전에는 HTML의 hidden으로 숨겨져 있다 ---- */
.ad-slot { margin: 36px 0; min-height: 100px; }
.ad-slot .ad-label { display: block; font-size: 0.7rem; color: var(--muted); margin-bottom: 4px; }