:root {
  --bg: #0f1115;
  --surface: #181b22;
  --surface-2: #1f2330;
  --border: #2a2f3a;
  --text: #e6e9ef;
  --muted: #8b93a3;
  --accent: #4c8bf5;
  --accent-hover: #3b78e0;
  --error: #ff6b6b;
  --ok: #4ade80;
  --radius: 10px;
}

* { box-sizing: border-box; }

/* The `hidden` attribute must win over component display rules below
   (e.g. .centered sets display:grid, which otherwise overrides [hidden]). */
[hidden] { display: none !important; }

body {
  margin: 0;
  font: 15px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}

h1, h2 { margin: 0 0 .5rem; font-weight: 600; }
h1 { font-size: 1.4rem; }
h2 { font-size: 1.1rem; }

.muted { color: var(--muted); }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 13px; }
.error { color: var(--error); margin: .5rem 0 0; }
.ok { color: var(--ok); margin: .5rem 0 0; }

/* layout */
.centered {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 1rem;
}
.container { max-width: 1100px; margin: 0 auto; padding: 1.5rem; }
.row { display: flex; gap: 1.5rem; flex-wrap: wrap; }
.grow { flex: 1 1 360px; }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .9rem 1.5rem;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

/* cards */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: 1.5rem;
}
.card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: .75rem;
}
.card-head h2 { margin: 0; }
.login-card { width: 320px; }

/* forms */
label {
  display: block;
  margin: .75rem 0;
  color: var(--muted);
  font-size: 13px;
}
label.inline { display: flex; align-items: center; gap: .5rem; }
input, textarea {
  width: 100%;
  margin-top: .35rem;
  padding: .55rem .65rem;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font: inherit;
}
label.inline input { width: auto; margin: 0; }
input:focus, textarea:focus { outline: none; border-color: var(--accent); }
textarea { resize: vertical; }

/* buttons */
.btn, .btn-ghost, .btn-sm {
  cursor: pointer;
  border-radius: 8px;
  border: 1px solid transparent;
  font: inherit;
  transition: background .15s, border-color .15s;
}
.btn {
  width: 100%;
  margin-top: .5rem;
  padding: .6rem 1rem;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
}
.btn:hover { background: var(--accent-hover); }
.btn-ghost {
  padding: .45rem .8rem;
  background: transparent;
  border-color: var(--border);
  color: var(--text);
}
.btn-ghost:hover { background: var(--surface-2); }
.btn-sm {
  padding: .25rem .6rem;
  font-size: 12px;
  background: var(--surface-2);
  border-color: var(--border);
  color: var(--text);
}
.btn-sm:hover { border-color: var(--accent); }
.btn-sm + .btn-sm { margin-left: .4rem; }
.del-cert:hover { border-color: var(--error); color: var(--error); }

/* table */
.grid {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
.grid th, .grid td {
  text-align: left;
  padding: .55rem .6rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.grid th { color: var(--muted); font-weight: 500; white-space: nowrap; }
.grid td.mono { word-break: break-all; max-width: 220px; }
.grid tbody tr:hover { background: var(--surface-2); }

/* expired certificates */
.grid tr.expired { background: rgba(255, 107, 107, .10); }
.grid tr.expired td { color: var(--error); }
.grid tr.expired td:nth-child(4)::after { content: " · просрочен"; font-weight: 600; }

#sign-result { margin-top: 1rem; }

/* thumbprint filter */
.cert-filter {
  width: 100%;
  margin: 0 0 1.5rem;
  padding: .6rem .8rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font: inherit;
}
.cert-filter:focus { outline: none; border-color: var(--accent); }
.cert-filter::placeholder { color: var(--muted); }