:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --text: #1f2430;
  --muted: #6b7280;
  --border: #e2e5ea;
  --primary: #2563eb;
  --primary-d: #1d4ed8;
  --ok-bg: #e7f6ec; --ok-tx: #1a7f43;
  --err-bg: #fdecec; --err-tx: #c0392b;
  --radius: 10px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14171c; --card: #1d222b; --text: #e6e8ec;
    --muted: #9aa3b2; --border: #2c333f;
    --ok-bg: #14352099; --ok-tx: #6ee7a0;
    --err-bg: #3a1c1c99; --err-tx: #ff8a80;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
h1,h2,h3 { margin: 0 0 .6em; }
h3 { font-size: 1.05em; }

.topbar {
  display: flex; align-items: center; gap: .5rem;
  background: var(--card); border-bottom: 1px solid var(--border);
  padding: .8rem 1.2rem; position: sticky; top: 0; z-index: 5;
}
.brand { font-weight: 700; }
.spacer { flex: 1; }

.container { max-width: 760px; margin: 1.4rem auto; padding: 0 1rem; }

.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.2rem 1.3rem; margin-bottom: 1.2rem;
}
.card.slim { padding: 1rem 1.3rem; }
.card.result { text-align: center; }

label { display: block; margin: .6rem 0; font-size: .92em; }
label.inline { display: inline-flex; align-items: center; gap: .4rem; margin-right: 1rem; }
input[type=text], input[type=password], input[type=number], select {
  width: 100%; padding: .5rem .6rem; margin-top: .25rem;
  border: 1px solid var(--border); border-radius: 7px;
  background: var(--bg); color: var(--text); font: inherit;
}
input[type=color] { width: 48px; height: 34px; border: 1px solid var(--border); border-radius: 6px; vertical-align: middle; background: var(--bg); }
input[type=range] { width: 100%; vertical-align: middle; }
input[type=file] { width: 100%; margin-top: .25rem; }

.row { display: flex; gap: 1rem; flex-wrap: wrap; }
.row > label { flex: 1; min-width: 140px; }

fieldset { border: 1px solid var(--border); border-radius: 8px; margin: 1rem 0; padding: .8rem 1rem; }
legend { padding: 0 .4rem; color: var(--muted); font-size: .85em; }

.group { border-top: 1px dashed var(--border); margin-top: 1rem; padding-top: .6rem; }

.btn {
  display: inline-block; padding: .55rem 1.1rem; border: 1px solid var(--border);
  border-radius: 8px; background: var(--card); color: var(--text);
  font: inherit; cursor: pointer; text-decoration: none;
}
.btn:hover { border-color: var(--primary); }
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn.primary:hover { background: var(--primary-d); }
.btn.ghost { background: transparent; }
.actions { margin-top: 1rem; }

.alert { padding: .7rem 1rem; border-radius: 8px; margin-bottom: 1rem; }
.alert.ok { background: var(--ok-bg); color: var(--ok-tx); }
.alert.err { background: var(--err-bg); color: var(--err-tx); }

.muted { color: var(--muted); font-size: .88em; }
.preview { max-width: 100%; border-radius: 8px; border: 1px solid var(--border); margin: .6rem 0; }

.preset-list { list-style: none; padding: 0; margin: 0; }
.preset-item { padding: .5rem 0; border-bottom: 1px solid var(--border); }
.preset-row { display: flex; justify-content: space-between; align-items: center; gap: .5rem; flex-wrap: wrap; }
.preset-name { font-weight: 600; }
.preset-actions { display: flex; gap: .8rem; align-items: center; }
.link-btn {
  background: none; border: none; padding: 0; cursor: pointer;
  color: var(--primary); font: inherit; font-size: .85em; text-decoration: none;
}
.link-btn:hover { text-decoration: underline; }
.rename-form { display: flex; gap: .5rem; margin-top: .6rem; flex-wrap: wrap; align-items: center; }
.rename-form input[type=text] { flex: 1; min-width: 160px; }

.protected-link { border-top: 1px dashed var(--border); margin-top: 1rem; padding-top: 1rem; text-align: left; }
.protected-link h3 { margin-bottom: .3rem; }
.link-box { margin-top: .8rem; display: flex; gap: .5rem; flex-wrap: wrap; align-items: center; }
.link-box input { flex: 1; min-width: 200px; font-size: .85em; }
.link-box .muted { flex-basis: 100%; margin: .2rem 0 0; }
code { background: var(--bg); padding: .1em .35em; border-radius: 4px; font-size: .9em; }
.del { color: var(--err-tx); text-decoration: none; font-size: .85em; }

.foot { text-align: center; color: var(--muted); font-size: .85em; padding: 1.5rem 1rem 2.5rem; }

/* Login */
.login-wrap { min-height: 100vh; display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 1rem; }
.login-card { width: 100%; max-width: 360px; }
.login-card h1 { font-size: 1.3em; text-align: center; }
.version { color: var(--muted); font-size: .8em; margin-top: 1rem; }