:root {
  color-scheme: light;
  --accent: #6d5bf6;
  --accent-dark: #5a47e8;
  --accent-soft: #f0edff;
  --ink: #1b1b23;
  --muted: #6b6b76;
  --line: #e7e6ef;
  --bg: #f6f5fb;
  --card: #ffffff;
  --radius: 16px;
  --shadow: 0 1px 2px rgba(20, 20, 40, .04), 0 8px 24px rgba(20, 20, 40, .06);
  --shadow-hover: 0 4px 10px rgba(20, 20, 40, .06), 0 16px 32px rgba(20, 20, 40, .10);
}

* { box-sizing: border-box; }

body {
  font-family: "Pretendard", system-ui, -apple-system, "Segoe UI", sans-serif;
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.55;
}

/* ---------- header ---------- */

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  background: rgba(255, 255, 255, .85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand {
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -.02em;
  text-decoration: none;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: .4rem;
}

.brand::before {
  content: "";
  display: inline-block;
  width: .6rem;
  height: .6rem;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), #ff7ad1);
}

.lang-switch { display: flex; gap: .25rem; }
.lang-switch a {
  padding: .35rem .7rem;
  border-radius: 999px;
  text-decoration: none;
  color: var(--muted);
  font-size: .85rem;
  font-weight: 600;
  transition: background .15s, color .15s;
}
.lang-switch a:hover { background: var(--accent-soft); color: var(--accent-dark); }
.lang-switch a.active { background: var(--accent); color: #fff; }

/* ---------- layout ---------- */

.site-main { max-width: 820px; margin: 2.5rem auto; padding: 0 1.5rem; }

.site-main > h1 {
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: -.01em;
  margin-bottom: .25rem;
}
.site-main > p { color: var(--muted); margin-top: 0; }

.site-footer { text-align: center; padding: 3rem 1rem 4rem; color: var(--muted); font-size: .9rem; }
.site-footer a { color: var(--muted); text-decoration: none; }
.site-footer a:hover { color: var(--accent-dark); }

/* ---------- home tool grid ---------- */

.tool-list {
  list-style: none;
  padding: 0;
  margin-top: 1.5rem;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: .75rem;
}
.tool-list li a {
  display: block;
  padding: 1rem 1.1rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  text-decoration: none;
  color: var(--ink);
  font-weight: 600;
  box-shadow: var(--shadow);
  transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease;
}
.tool-list li a:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
  border-color: var(--accent);
  color: var(--accent-dark);
}

/* ---------- forms (every tool page, no class needed) ---------- */

main.site-main form {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow);
}

main.site-main form label {
  display: block;
  margin: 1.1rem 0 .4rem;
  font-weight: 700;
  font-size: .92rem;
}
main.site-main form label:first-of-type { margin-top: 0; }

main.site-main form input[type="text"],
main.site-main form input[type="number"],
main.site-main form input[type="password"],
main.site-main form textarea,
main.site-main form select {
  width: 100%;
  padding: .65rem .8rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fbfbfe;
  font-size: .95rem;
  font-family: inherit;
  transition: border-color .15s, box-shadow .15s;
}
main.site-main form input[type="text"]:focus,
main.site-main form input[type="number"]:focus,
main.site-main form input[type="password"]:focus,
main.site-main form textarea:focus,
main.site-main form select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
main.site-main form textarea { resize: vertical; min-height: 4.5rem; }

main.site-main form input[type="checkbox"] { width: auto; margin-right: .4rem; }

main.site-main form button[type="submit"] {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  margin-top: 1.75rem;
  padding: .9rem 2rem;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #fff;
  border: none;
  border-radius: 999px;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -.01em;
  cursor: pointer;
  box-shadow: 0 6px 16px rgba(109, 91, 246, .35);
  transition: transform .12s ease, box-shadow .12s ease, filter .12s ease;
}
main.site-main form button[type="submit"]:hover { transform: translateY(-1px); box-shadow: 0 10px 22px rgba(109, 91, 246, .42); filter: brightness(1.04); }
main.site-main form button[type="submit"]:active { transform: translateY(0); box-shadow: 0 4px 10px rgba(109, 91, 246, .35); }
main.site-main form button[type="submit"]:disabled { background: #d8d6e8; color: #fff; cursor: not-allowed; box-shadow: none; transform: none; }

/* ---------- drag & drop file picker (progressively enhanced by upload.js) ---------- */

.gpdf-dropzone {
  margin-top: .4rem;
  border: 2px dashed #c9c6e8;
  border-radius: 14px;
  background: #fbfbfe;
  padding: 1.75rem 1.25rem;
  text-align: center;
  cursor: pointer;
  transition: border-color .15s, background .15s;
}
.gpdf-dropzone:hover { border-color: var(--accent); background: var(--accent-soft); }
.gpdf-dropzone.is-dragover { border-color: var(--accent); background: var(--accent-soft); }

.gpdf-dropzone__icon { font-size: 1.8rem; display: block; margin-bottom: .4rem; }
.gpdf-dropzone__label { font-weight: 700; color: var(--ink); }
.gpdf-dropzone__hint { color: var(--muted); font-size: .85rem; margin-top: .2rem; }

.gpdf-filelist { list-style: none; padding: 0; margin: .75rem 0 0; display: flex; flex-direction: column; gap: .4rem; }
.gpdf-filelist li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .6rem;
  background: var(--accent-soft);
  border-radius: 10px;
  padding: .5rem .75rem;
  font-size: .88rem;
}
.gpdf-filelist__order {
  flex-shrink: 0;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: .78rem;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.gpdf-filelist__thumb {
  flex-shrink: 0;
  width: 32px;
  height: 42px;
  border-radius: 4px;
  background: #e3e1f5 url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%238b86c9' stroke-width='1.5'%3E%3Cpath d='M6 2h9l5 5v13a2 2 0 0 1-2 2H6a2 2 0 0 1-2-2V4a2 2 0 0 1 2-2z'/%3E%3C/svg%3E") center / 60% no-repeat;
}
.gpdf-filelist__thumb.is-ready { background: none; box-shadow: 0 1px 3px rgba(0,0,0,.18); }
.gpdf-filelist__name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-weight: 600; }
.gpdf-filelist__size { color: var(--muted); flex-shrink: 0; }
.gpdf-filelist__move {
  flex-shrink: 0;
  border: none;
  background: #fff;
  color: var(--accent-dark);
  width: 1.6rem;
  height: 1.6rem;
  border-radius: 8px;
  cursor: pointer;
  font-size: .75rem;
  line-height: 1;
}
.gpdf-filelist__move:hover:not(:disabled) { background: var(--accent); color: #fff; }
.gpdf-filelist__move:disabled { opacity: .3; cursor: default; }
.gpdf-filelist__remove {
  flex-shrink: 0;
  border: none;
  background: #fff;
  color: var(--muted);
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  cursor: pointer;
  font-size: .9rem;
  line-height: 1;
}
.gpdf-filelist__remove:hover { background: #fff; color: #e0485b; }

/* ---------- visual page picker ---------- */

.page-picker-toolbar { display: flex; gap: .5rem; margin-bottom: .75rem; }
.page-picker-selectall {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--accent-dark);
  padding: .4rem .9rem;
  border-radius: 999px;
  font-size: .85rem;
  font-weight: 700;
  cursor: pointer;
}
.page-picker-selectall:hover { background: var(--accent-soft); }

.page-picker-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
  gap: .75rem;
  max-height: 60vh;
  overflow-y: auto;
  padding: .25rem;
  margin-bottom: 1rem;
}
.page-picker-item {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  border: 2px solid var(--line);
  border-radius: 10px;
  padding: .5rem .4rem .35rem;
  cursor: pointer;
  background: #fbfbfe;
  transition: border-color .12s, background .12s;
}
.page-picker-item:hover { border-color: #c9c6e8; }
.page-picker-item input[type="checkbox"] { position: absolute; top: .4rem; left: .4rem; width: 1.1rem; height: 1.1rem; margin: 0; z-index: 1; }
.page-picker-item img { width: 100%; height: auto; border-radius: 4px; box-shadow: 0 1px 4px rgba(0,0,0,.12); background: #fff; }
.page-picker-item .page-picker-num { font-size: .78rem; color: var(--muted); margin-top: .3rem; font-weight: 600; }
.page-picker-item:has(input:checked) { border-color: var(--accent); background: var(--accent-soft); }

/* ---------- click-to-select-and-order page grid (select-merge-pdf) ---------- */

.page-click-toolbar { display: flex; align-items: center; gap: .5rem; margin: 1rem 0 .75rem; }
.page-click-selectall {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--accent-dark);
  padding: .4rem .9rem;
  border-radius: 999px;
  font-size: .85rem;
  font-weight: 700;
  cursor: pointer;
}
.page-click-selectall:hover { background: var(--accent-soft); }
.page-click-count { color: var(--muted); font-size: .88rem; font-weight: 600; }

.page-click-group { margin-bottom: 1.25rem; }
.page-click-group__label {
  font-size: .85rem;
  font-weight: 700;
  color: var(--muted);
  margin-bottom: .5rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.page-click-group__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
  gap: .6rem;
}
.page-click-item {
  position: relative;
  cursor: pointer;
  border: 2px solid var(--line);
  border-radius: 8px;
  padding: .3rem;
  background: #fbfbfe;
  transition: border-color .12s, background .12s;
}
.page-click-item:hover { border-color: #c9c6e8; }
.page-click-item canvas { display: block; width: 100%; height: auto; border-radius: 3px; background: #fff; box-shadow: 0 1px 3px rgba(0,0,0,.14); }
.page-click-item .page-click-badge { display: none; }
.page-click-item.is-selected { border-color: var(--accent); background: var(--accent-soft); }
.page-click-item.is-selected .page-click-badge {
  display: flex;
  position: absolute;
  top: -.5rem;
  left: -.5rem;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: .78rem;
  font-weight: 700;
  align-items: center;
  justify-content: center;
  box-shadow: 0 1px 3px rgba(0,0,0,.25);
}

/* ---------- result / error ---------- */

.error-box, .result-box {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.75rem 2rem;
  box-shadow: var(--shadow);
}
.result-ready { font-weight: 700; font-size: 1.05rem; }
.result-files { list-style: none; padding: 0; margin: 1rem 0; display: flex; flex-direction: column; gap: .5rem; }
.result-files a {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .75rem 1.1rem;
  background: var(--accent-soft);
  color: var(--accent-dark);
  border-radius: 10px;
  text-decoration: none;
  font-weight: 700;
}
.result-files a::before { content: "⬇"; }
.result-files a:hover { background: var(--accent); color: #fff; }
.result-retention { color: var(--muted); font-size: .85rem; margin-top: .5rem; }

/* ---------- home: notice, search, categories ---------- */

.site-main > .home-notice {
  background: var(--accent-soft);
  color: var(--accent-dark);
  border-radius: 10px;
  padding: .6rem .9rem;
  font-size: .88rem;
}
.tool-search {
  width: 100%;
  margin-top: 1rem;
  padding: .8rem 1rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  font-size: 1rem;
  font-family: inherit;
  background: var(--card);
  box-shadow: var(--shadow);
}
.tool-search:focus { outline: 2px solid var(--accent); border-color: var(--accent); }
.tool-category { margin-top: 1.75rem; }
.tool-category h2 {
  font-size: 1rem;
  font-weight: 800;
  color: var(--muted);
  margin: 0 0 .5rem;
}
.tool-category .tool-list { margin-top: .5rem; }
.tool-category[hidden], .tool-list li[hidden], .tool-search-empty[hidden] { display: none; }
.tool-search-empty { margin-top: 2rem; text-align: center; }

/* ---------- processing feedback ---------- */

button[type="submit"].is-processing { opacity: .7; cursor: progress; }

/* ---------- small screens ---------- */

@media (max-width: 600px) {
  .site-header { padding: .75rem 1rem; }
  .site-main { margin: 1.25rem auto; padding: 0 1rem; }
  main.site-main form { padding: 1.25rem; }
  .error-box, .result-box { padding: 1.25rem; }
  .tool-list { grid-template-columns: repeat(2, 1fr); }
  .tool-list li a { padding: .85rem .8rem; font-size: .92rem; }
  .lang-switch a { padding: .3rem .55rem; }
}

/* ---------- SEO text blocks (how-to on tool pages, FAQ on home) ---------- */

.seo-howto, .seo-faq {
  margin-top: 2.5rem;
  color: var(--muted);
  font-size: .95rem;
}
.seo-howto h2, .seo-faq h2 { font-size: 1.05rem; color: var(--ink); margin-bottom: .5rem; }
.seo-howto ol { padding-left: 1.25rem; }
.seo-faq details {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: .75rem 1rem;
  margin-bottom: .5rem;
}
.seo-faq summary { cursor: pointer; font-weight: 700; color: var(--ink); }
.seo-faq details p { margin: .5rem 0 0; }