:root {
  --bg: #f6f7fb;
  --surface: #ffffff;
  --surface-2: #f2f4f9;
  --border: #e2e6f0;
  --border-strong: #cfd5e4;
  --text: #111728;
  --text-soft: #4c5570;
  --muted: #7c859c;
  --accent: #4f46e5;
  --accent-hover: #4338ca;
  --accent-soft: #eef0ff;
  --ok: #12805c;
  --ok-soft: #e6f7f0;
  --warn: #a8620a;
  --warn-soft: #fdf3e2;
  --danger: #c22f3c;
  --danger-soft: #fdecee;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(17, 23, 40, .04), 0 8px 24px rgba(17, 23, 40, .05);
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1017;
    --surface: #151a24;
    --surface-2: #1c222e;
    --border: #262e3d;
    --border-strong: #354054;
    --text: #e8ecf5;
    --text-soft: #aab4c8;
    --muted: #7d889e;
    --accent: #7b7bf5;
    --accent-hover: #9191ff;
    --accent-soft: #1e2140;
    --ok: #4ade80;
    --ok-soft: #12291f;
    --warn: #fbbf24;
    --warn-soft: #2a2213;
    --danger: #f87171;
    --danger-soft: #2b1417;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25);
  }
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Malgun Gothic",
    "Apple SD Gothic Neo", "Noto Sans KR", Roboto, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  width: 100%;
  max-width: 1020px;
  margin: 0 auto;
  padding: 0 20px;
}

.muted { color: var(--muted); }
.small { font-size: 13px; }

/* header */
.site-header {
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 80%, transparent);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 20;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 58px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  letter-spacing: -.01em;
}

.brand-mark {
  width: 26px;
  height: 26px;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 14px;
  font-weight: 800;
}

.header-right { display: flex; align-items: center; gap: 12px; }

.badge {
  font-size: 12px;
  color: var(--ok);
  background: var(--ok-soft);
  border: 1px solid color-mix(in srgb, var(--ok) 25%, transparent);
  padding: 3px 9px;
  border-radius: 999px;
  white-space: nowrap;
}

.lang,
.seg {
  display: inline-flex;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 9px;
  padding: 2px;
}

.lang-btn,
.seg-btn {
  border: 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 12px;
  font-weight: 600;
  padding: 3px 9px;
  border-radius: 7px;
  cursor: pointer;
}

.lang-btn.is-active,
.seg-btn.is-active {
  background: var(--surface);
  color: var(--text);
  box-shadow: 0 1px 2px rgba(0, 0, 0, .08);
}

/* hero */
.hero { padding: 44px 0 24px; text-align: center; }

.hero h1 {
  margin: 0 0 10px;
  font-size: clamp(26px, 4.6vw, 38px);
  letter-spacing: -.03em;
  line-height: 1.25;
}

.lead {
  margin: 0 auto;
  max-width: 620px;
  color: var(--text-soft);
  font-size: 15.5px;
}

/* card */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  margin-bottom: 26px;
}

/* dropzone */
.dropzone {
  border: 1.5px dashed var(--border-strong);
  border-radius: 12px;
  padding: 32px 20px;
  text-align: center;
  background: var(--surface-2);
  transition: border-color .15s, background .15s;
  cursor: pointer;
}

.dropzone:hover,
.dropzone:focus-visible {
  border-color: var(--accent);
  background: var(--accent-soft);
  outline: none;
}

.dropzone.is-drag {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.dropzone-icon { color: var(--accent); margin-bottom: 6px; }

.dropzone-title { margin: 0 0 6px; font-weight: 650; font-size: 16px; }

.dropzone-sub {
  margin: 0 auto 14px;
  max-width: 460px;
  color: var(--text-soft);
  font-size: 13.5px;
}

.dropzone-hint { margin: 12px 0 0; font-size: 12px; color: var(--muted); }

.dropzone.is-compact { display: none; }

/* filebar */
.filebar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding: 12px 14px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  margin-bottom: 20px;
}

.filebar-info { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; min-width: 0; }
.filebar-info strong { font-size: 14px; word-break: break-all; }
.filebar-actions { display: flex; gap: 6px; }

/* buttons */
.btn {
  font: inherit;
  font-size: 14px;
  border-radius: 9px;
  border: 1px solid transparent;
  padding: 8px 14px;
  cursor: pointer;
  transition: background .15s, border-color .15s, opacity .15s;
  white-space: nowrap;
}

.btn:disabled { opacity: .5; cursor: not-allowed; }

.btn-primary {
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  border-color: var(--accent);
}

.btn-primary:hover:not(:disabled) { background: var(--accent-hover); border-color: var(--accent-hover); }

.btn-ghost {
  background: transparent;
  color: var(--text-soft);
  border-color: var(--border);
}

.btn-ghost:hover:not(:disabled) { background: var(--surface-2); color: var(--text); }

.btn-sm { padding: 5px 10px; font-size: 13px; }
.btn-lg { padding: 13px 26px; font-size: 15px; width: 100%; }

/* section heads */
.rules-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin: 26px 0 10px;
}

.rules-head:first-of-type { margin-top: 0; }

.rules-head h2,
.preview-head h2,
.content h2 {
  font-size: 15px;
  font-weight: 700;
  margin: 0;
  letter-spacing: -.01em;
}

.rules-head p { margin: 0; }
.rules-head-actions { display: flex; gap: 6px; }

/* presets */
.presets {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.preset {
  font: inherit;
  font-size: 13px;
  padding: 7px 13px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-soft);
  cursor: pointer;
  transition: all .15s;
}

.preset:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
}

/* rules */
.rules { display: flex; flex-direction: column; gap: 8px; }

.rule {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface-2);
}

.rule-order {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  background: var(--surface);
  border: 1px solid var(--border);
  display: grid;
  place-items: center;
  font-size: 11px;
  color: var(--muted);
  flex: none;
}

.rule select,
.rule input[type="text"],
.rule input[type="number"] {
  font: inherit;
  font-size: 13px;
  padding: 6px 8px;
  border-radius: 7px;
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--text);
  min-width: 0;
}

.rule input[type="text"] { width: 130px; }
.rule input[type="number"] { width: 74px; }

.rule select:focus,
.rule input:focus { outline: 2px solid var(--accent-soft); border-color: var(--accent); }

.rule-type { font-weight: 600; }

.rule-field {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 12px;
  color: var(--muted);
}

.rule-check {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 12px;
  color: var(--text-soft);
  cursor: pointer;
  user-select: none;
}

.rule-spacer { flex: 1; }

.rule-remove {
  border: 0;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 16px;
  line-height: 1;
  padding: 4px 6px;
  border-radius: 6px;
}

.rule-remove:hover { background: var(--danger-soft); color: var(--danger); }

.rules-empty {
  padding: 18px;
  text-align: center;
  color: var(--muted);
  font-size: 13px;
  border: 1px dashed var(--border-strong);
  border-radius: 10px;
}

/* preview */
.preview-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin: 26px 0 10px;
}

.preview-head-right {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.preview {
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: auto;
  max-height: 420px;
  background: var(--surface);
}

.preview .empty {
  margin: 0;
  padding: 30px 20px;
  text-align: center;
  color: var(--muted);
  font-size: 13.5px;
}

table.names {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

table.names th {
  position: sticky;
  top: 0;
  z-index: 1;
  background: var(--surface-2);
  text-align: left;
  font-weight: 600;
  color: var(--muted);
  font-size: 11.5px;
  letter-spacing: .02em;
  text-transform: uppercase;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

table.names td {
  padding: 7px 12px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}

table.names tr:last-child td { border-bottom: 0; }

table.names td.num { color: var(--muted); font-size: 12px; width: 40px; }

.fname {
  font-family: var(--mono);
  font-size: 12.5px;
  word-break: break-all;
}

.fname.old { color: var(--muted); }
.fname.new { color: var(--text); font-weight: 500; }

.fdir { color: var(--muted); }

tr.row-error { background: var(--danger-soft); }
tr.row-warn { background: var(--warn-soft); }

.chip {
  display: inline-block;
  font-size: 11px;
  padding: 2px 7px;
  border-radius: 999px;
  white-space: nowrap;
  font-weight: 600;
}

.chip.ok { background: var(--ok-soft); color: var(--ok); }
.chip.warn { background: var(--warn-soft); color: var(--warn); }
.chip.error { background: var(--danger-soft); color: var(--danger); }

.more-row td { text-align: center; color: var(--muted); font-size: 12px; }

/* summary */
.summary {
  margin-top: 14px;
  border-radius: 10px;
  padding: 12px 14px;
  font-size: 13.5px;
  border: 1px solid var(--border);
  background: var(--surface-2);
}

.summary.ok { border-color: color-mix(in srgb, var(--ok) 30%, transparent); background: var(--ok-soft); color: var(--ok); }
.summary.warn { border-color: color-mix(in srgb, var(--warn) 30%, transparent); background: var(--warn-soft); color: var(--warn); }
.summary.error { border-color: color-mix(in srgb, var(--danger) 30%, transparent); background: var(--danger-soft); color: var(--danger); }

.summary ul { margin: 6px 0 0; padding-left: 18px; }

/* actions */
.actions { margin-top: 20px; text-align: center; }
.actions p { margin: 10px 0 0; }

/* ad */
.ad-slot {
  margin: 8px 0 34px;
  min-height: 92px;
  border: 1px dashed var(--border-strong);
  border-radius: 10px;
  display: grid;
  place-items: center;
  color: var(--muted);
  font-size: 12px;
  background: var(--surface-2);
}

/* content */
.content { padding-bottom: 40px; }

.content h2 {
  font-size: 17px;
  margin: 32px 0 12px;
}

.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.steps li {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 16px;
}

.steps strong { display: block; margin-bottom: 4px; font-size: 14px; }
.steps p { margin: 0; font-size: 13.5px; color: var(--text-soft); }

.bullets { margin: 0; padding-left: 20px; color: var(--text-soft); }
.bullets li { margin-bottom: 6px; }

details {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 16px;
  margin-bottom: 8px;
}

details summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 14px;
}

details p { margin: 8px 0 0; color: var(--text-soft); font-size: 13.5px; }

/* footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 22px 0;
  font-size: 13px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

@media (max-width: 620px) {
  .card { padding: 14px; }
  .hero { padding: 30px 0 18px; }
  .rule input[type="text"] { width: 100px; }
  .badge { display: none; }
  .filebar { flex-direction: column; align-items: flex-start; }
}