/* 배경 지우개 공통 스타일 (MD HTML 변환기·LaTeX 워드 변환기와 같은 틀)
   색상은 모두 토큰으로 정의하고 다크 모드에서 다시 지정한다. */
:root {
  color-scheme: light dark;
  --bg: #f5f6fa; --card: #ffffff; --foreground: #1a1a2e; --muted: #5b6075;
  --border: #d6d9e3; --border-strong: #b8bdcf;
  --accent: #5a45c9; --accent-hover: #4836a8; --accent-text: #4d3ab5; --accent-soft: #5a45c91f;
  --go: #15803d; --ok: #15803d; --danger: #b91c1c;
  --warn-bg: #d9770614; --warn-border: #d9770650;
  --paper: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1117; --card: #181b24; --foreground: #e6e8ef; --muted: #a0a6b8;
    --border: #2c3140; --border-strong: #3c4254;
    --accent-text: #b3a6ff; --accent-soft: #8b7bf029;
    --ok: #4ade80; --danger: #f87171;
    --warn-bg: #f59e0b14; --warn-border: #f59e0b45;
  }
}
* { 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 { 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; }
}
.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); }

/* ---- 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(90, 69, 201, 0.33); }
.btn.huge:hover, .btn.huge2:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.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; }
}
.actions { margin-top: 22px; text-align: center; }
.btn { display: inline-block; padding: 8px 15px; font: inherit; font-size: 0.9rem; 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.small { padding: 6px 12px; font-size: 0.82rem; }
.btn.big { font-size: 1.1rem; padding: 14px 28px; border-radius: 12px; }
.btn.huge2 { font-size: 1.3rem; padding: 16px 56px; border-radius: 13px; box-shadow: 0 10px 26px rgba(90, 69, 201, 0.28); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; box-shadow: none; }
.btn:focus-visible, input:focus-visible, summary:focus-visible, .linkbtn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.btnrow { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 8px; align-items: center; }
.btnrow.center { justify-content: center; }
.linkbtn { border: 0; background: none; padding: 0 4px; font: inherit; color: var(--accent-text); text-decoration: underline; cursor: pointer; }
@media (max-width: 600px) {
  .tool { padding: 16px; }
  .btn.huge2 { width: 100%; padding: 16px 20px; }
}
.hint { font-size: 0.85rem; color: var(--muted); margin: 10px 0 0; }
.okmsg { color: var(--ok); font-weight: 600; font-size: 0.88rem; margin: 10px 0 0; min-height: 1.4em; text-align: center; }
.okmsg.err { color: var(--danger); }
.warn { background: var(--warn-bg); border: 1px solid var(--warn-border); border-radius: 10px; padding: 8px 12px; font-size: 0.85rem; margin: 0; }
/* ---- 기능 소개 카드 ---- */
.features { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; margin: 40px 0 0; padding: 0; list-style: none; }
.features li { padding: 16px 18px; border: 1px solid var(--border); border-radius: 12px; background: var(--card); }
.features b { display: block; margin-bottom: 4px; }
.features span { display: block; font-size: 0.88rem; line-height: 1.6; color: var(--muted); }

/* ---- 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 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 pre { margin: 12px 0; padding: 14px 16px; overflow-x: auto; border: 1px solid var(--border); border-radius: 10px; background: var(--card); font-size: 0.9rem; line-height: 1.6; }
.prose pre code { padding: 0; background: none; font-size: inherit; }
.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; }
.ad-slot.preview { display: flex; align-items: center; justify-content: center; border: 2px dashed var(--border-strong); border-radius: 10px; color: var(--muted); font-size: 0.85rem; }
.warnings { margin: 16px 0 0; text-align: left; }
.warnings summary { cursor: pointer; font-size: 0.9rem; font-weight: 600; }
.warnings ul { margin: 8px 0 0; padding-left: 1.2em; font-size: 0.85rem; color: var(--muted); max-height: 220px; overflow: auto; }
.warnings li + li { margin-top: 3px; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ---- 첫 화면 추가 요소 ---- */
.hero h1, .hero .sub { word-break: keep-all; }
kbd { font: inherit; font-size: 0.85em; padding: 1px 6px; border: 1px solid var(--border-strong); border-bottom-width: 2px; border-radius: 5px; background: var(--card); }
.samples { display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 8px; margin: 22px 0 0; font-size: 0.92rem; color: var(--muted); }
.sample { padding: 0; width: 56px; height: 56px; overflow: hidden; border: 1px solid var(--border-strong); border-radius: 10px; background: none; cursor: pointer; }
.sample:hover { border-color: var(--accent); }
.sample:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.sample img { display: block; width: 100%; height: 100%; object-fit: cover; }
.hero .firstrun { margin: 12px 0 0; font-size: 0.82rem; color: var(--muted); }
.dropveil { position: fixed; inset: 0; z-index: 50; display: flex; align-items: center; justify-content: center; background: rgba(40, 30, 110, 0.55); color: #fff; font-size: 1.6rem; font-weight: 700; pointer-events: none; }

/* ---- 작업 화면: 왼쪽 미리보기, 오른쪽 도구 ---- */
.workspace { max-width: 1500px; margin: 0 auto; padding: 14px 20px 0; }
.ws-bar { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 16px; }
.ws-file { display: flex; flex-wrap: wrap; align-items: baseline; gap: 2px 12px; min-width: 0; }
.ws-file b { font-size: 1.02rem; overflow-wrap: anywhere; }
.ws-back { padding: 0; font-size: 0.88rem; }
.fmeta { font-size: 0.85rem; color: var(--muted); }
.ws-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }
.workspace .okmsg { margin: 4px 0; }
.ws-main { display: grid; grid-template-columns: minmax(0, 1fr) 290px; gap: 14px; align-items: start; }
.stage-col { min-width: 0; }
.stage { position: relative; height: min(calc(100vh - 130px), 780px); min-height: 360px; border: 1px solid var(--border); border-radius: 12px; background: var(--card); overflow: hidden; }
#view { display: block; width: 100%; height: 100%; touch-action: none; cursor: grab; outline: none; }
#view.grabbing { cursor: grabbing; }
#view.brush { cursor: none; }
#view.brush.grab { cursor: grab; }
#view.compare { cursor: ew-resize; }
.busy, .stage-err { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; padding: 16px; background: var(--card); text-align: center; }
.busy-card { width: min(420px, 100%); }
.busy-card b { display: block; font-size: 2.6rem; line-height: 1.1; font-variant-numeric: tabular-nums; }
.bar { height: 10px; margin: 12px 0; border-radius: 99px; background: var(--accent-soft); overflow: hidden; }
.bar span { display: block; height: 100%; width: 0; border-radius: 99px; background: var(--accent); transition: width 0.25s linear; }
.busy-card p { margin: 4px 0; word-break: keep-all; }
.stage-err p { max-width: 460px; margin: 0 auto 8px; word-break: keep-all; }
.zoom { position: absolute; right: 10px; bottom: 10px; display: flex; border: 1px solid var(--border-strong); border-radius: 9px; overflow: hidden; background: var(--card); }
.zoom button { min-width: 38px; height: 34px; padding: 0 8px; border: 0; background: none; color: var(--foreground); font: inherit; font-size: 0.85rem; cursor: pointer; }
.zoom button + button { border-left: 1px solid var(--border); }
.zoom button:hover { background: var(--accent-soft); }
.strip { display: flex; gap: 8px; margin: 10px 0 0; padding: 0 0 4px; list-style: none; overflow-x: auto; }
.thumb { display: flex; align-items: center; justify-content: center; width: 72px; height: 72px; padding: 0; overflow: hidden; border: 2px solid var(--border); border-radius: 10px; font: inherit; font-size: 0.72rem; color: var(--muted); cursor: pointer; background: repeating-conic-gradient(#0000001a 0 25%, #0000 0 50%) 0 0 / 14px 14px, var(--card); }
.thumb[aria-current="true"] { border-color: var(--accent); }
.thumb.err { color: var(--danger); }
.thumb img { width: 100%; height: 100%; object-fit: contain; }
.panel { display: grid; gap: 10px; }
.group { padding: 12px 14px; border: 1px solid var(--border); border-radius: 12px; background: var(--card); }
.group h2 { margin: 0 0 8px; font-size: 0.88rem; }
.seg { display: flex; border: 1px solid var(--border-strong); border-radius: 9px; overflow: hidden; }
.seg button { flex: 1; min-height: 36px; padding: 4px 6px; border: 0; background: none; color: var(--foreground); font: inherit; font-size: 0.85rem; cursor: pointer; }
.seg button + button { border-left: 1px solid var(--border-strong); }
.seg button[aria-pressed="true"] { background: var(--accent); color: #fff; font-weight: 600; }
.seg button:focus-visible, .sw:focus-visible, .zoom button:focus-visible, .thumb:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }
.swatches { display: flex; flex-wrap: wrap; gap: 6px; }
.sw { position: relative; width: 34px; height: 34px; padding: 0; border: 1px solid var(--border-strong); border-radius: 9px; cursor: pointer; overflow: hidden; }
.sw[aria-pressed="true"], .sw.custom.on { box-shadow: 0 0 0 2px var(--card), 0 0 0 4px var(--accent); }
.sw.checker { background: repeating-conic-gradient(#b8bdcf 0 25%, #fff 0 50%) 0 0 / 14px 14px; }
.sw.custom { background: conic-gradient(#f43f5e, #f59e0b, #22c55e, #3b82f6, #a855f7, #f43f5e); }
.sw.custom input { position: absolute; inset: 0; width: 100%; height: 100%; opacity: 0; cursor: pointer; }
.btn[aria-pressed="true"] { border-color: var(--accent); background: var(--accent-soft); color: var(--accent-text); }
.range { display: grid; gap: 3px; margin-top: 10px; font-size: 0.82rem; color: var(--muted); }
.range input[type=range] { width: 100%; accent-color: var(--accent); }
.range select { width: 100%; padding: 7px 8px; font: inherit; font-size: 0.85rem; color: var(--foreground); background: var(--card); border: 1px solid var(--border-strong); border-radius: 8px; }
.radio { display: flex; gap: 8px; margin-top: 8px; font-size: 0.88rem; font-weight: 600; cursor: pointer; }
.radio input { margin-top: 4px; accent-color: var(--accent); }
.radio small { display: block; font-weight: 400; font-size: 0.78rem; line-height: 1.45; color: var(--muted); }
.panel .hint { margin-top: 8px; font-size: 0.78rem; }
.panel .hint:empty { display: none; }
@media (max-width: 900px) {
  .workspace { padding: 10px 16px 0; }
  .ws-main { grid-template-columns: minmax(0, 1fr); }
  .stage { height: 56vh; min-height: 300px; }
}
.hero .alt, .hero .firstrun, .hero .trust { word-break: keep-all; }
@media (pointer: coarse) { .hero .alt { display: none; } }