:root {
  --bg: #fff;
  --fg: #111;
  --muted: #666;
  --dim: #999;
  --card: #f5f5f3;
  --border: rgba(0,0,0,0.15);
  --border-soft: rgba(0,0,0,0.08);
  --accent: #185FA5;
  --accent-fill: rgba(24,95,165,0.10);
  --warn: #C7522A;
  --ok: #0E7C3A;
}
[data-theme="dark"] {
  --bg: #1a1a18;
  --fg: #f0ede8;
  --muted: #999;
  --dim: #666;
  --card: #2a2a28;
  --border: rgba(255,255,255,0.15);
  --border-soft: rgba(255,255,255,0.08);
}

* { box-sizing: border-box; }
body {
  font-family: system-ui, -apple-system, sans-serif;
  max-width: 760px;
  margin: 1.5rem auto;
  padding: 0 1.5rem;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.5;
}

.topbar {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 1.25rem;
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: inherit; }
.brand-logo { width: 28px; height: 28px; flex: 0 0 28px; }
.brand h1 { font-size: 18px; font-weight: 500; margin: 0; }
.brand .tool-name { font-size: 13px; color: var(--muted); margin-left: 4px; }
.icon-btn {
  background: var(--card);
  border: 0.5px solid var(--border);
  border-radius: 8px;
  width: 34px; height: 34px;
  display: inline-flex; align-items: center; justify-content: center;
  cursor: pointer; color: var(--fg); font-size: 14px; padding: 0;
}
.icon-btn:hover { background: var(--border-soft); }

.tool-section { margin-bottom: 1.25rem; }
.tool-label {
  font-size: 11px; color: var(--muted); margin: 0 0 0.4rem;
  text-transform: uppercase; letter-spacing: 0.06em; font-weight: 500;
}

textarea, input[type="text"], input[type="url"], input[type="number"], input[type="password"], select {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  background: var(--card);
  border: 0.5px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 13px;
  color: var(--fg);
  outline: none;
  width: 100%;
  resize: vertical;
}
textarea { min-height: 110px; line-height: 1.45; }
textarea:focus, input:focus, select:focus { border-color: var(--accent); }

.btn {
  background: var(--card);
  border: 0.5px solid var(--border);
  border-radius: 8px;
  padding: 7px 14px;
  font-size: 13px;
  color: var(--fg);
  cursor: pointer;
  font-family: inherit;
}
.btn:hover { background: var(--border-soft); }
.btn-primary {
  background: var(--accent); color: #fff; border-color: var(--accent);
}
.btn-primary:hover { background: var(--accent); opacity: 0.88; }

.button-row { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; margin-top: 0.5rem; }

.status {
  display: inline-block; padding: 3px 9px;
  border-radius: 6px; font-size: 11px; font-weight: 500;
  vertical-align: middle;
}
.status-ok { background: rgba(14,124,58,0.12); color: var(--ok); }
.status-err { background: rgba(199,82,42,0.12); color: var(--warn); }
.status-info { background: rgba(24,95,165,0.12); color: var(--accent); }

.divider {
  border: none;
  height: 1px;
  background: var(--border-soft);
  margin: 1.75rem 0 1.25rem;
}

.scroll-top {
  position: fixed;
  bottom: 1.25rem; right: 1.25rem;
  width: 40px; height: 40px;
  border-radius: 8px;
  background: rgba(24, 95, 165, 0.55);
  color: #fff; border: none;
  font-size: 18px; line-height: 1;
  cursor: pointer;
  opacity: 0; pointer-events: none;
  transition: opacity 0.2s, background 0.15s, transform 0.15s;
  z-index: 100;
  display: flex; align-items: center; justify-content: center;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}
.scroll-top:hover { background: rgba(24, 95, 165, 0.85); transform: translateY(-1px); }
.scroll-top.visible { opacity: 1; pointer-events: auto; }

.about {
  margin-top: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-soft);
  font-size: 12px;
  color: var(--dim);
  line-height: 1.55;
}
.about a { color: var(--accent); text-decoration: none; }
.about a:hover { text-decoration: underline; }
.about p { margin: 0 0 0.5rem; }

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.75rem;
  margin: 1rem 0 2rem;
}
.tool-tile {
  background: var(--card);
  border: 0.5px solid var(--border-soft);
  border-radius: 10px;
  padding: 0.85rem 1rem;
  text-decoration: none;
  color: var(--fg);
  transition: border-color 0.15s, transform 0.1s;
  display: block;
}
.tool-tile:hover { border-color: var(--accent); transform: translateY(-1px); }
.tool-tile h3 { font-size: 14px; font-weight: 500; margin: 0 0 0.25rem; }
.tool-tile p { font-size: 12px; color: var(--muted); margin: 0; line-height: 1.45; }

.kv {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 6px 12px;
  font-size: 13px;
  align-items: baseline;
}
.kv dt { color: var(--muted); }
.kv dd { margin: 0; word-break: break-word; }

.code-out {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  background: var(--card);
  border: 0.5px solid var(--border-soft);
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 12px;
  white-space: pre-wrap;
  word-break: break-all;
  overflow-x: auto;
}

@media (max-width: 520px) {
  body { margin: 1rem auto; padding: 0 1rem; }
  .kv { grid-template-columns: 100px 1fr; }
}