:root {
  --accent: #1d4ed8;
  --danger: #b91c1c;
  --border: #e2e2e2;
  --muted: #6b7280;
  --bg: #f7f8fa;
}

* { box-sizing: border-box; }

body {
  font: 14px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
  margin: 0;
  background: var(--bg);
  color: #1f2937;
}

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

header {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 14px 20px;
  background: #fff;
  border-bottom: 1px solid var(--border);
}

.brand { font-size: 18px; font-weight: 700; }
.meta { color: var(--muted); font-size: 13px; flex: 1; }
.actions a, .actions button { font-size: 13px; }

/* ------------------------------------------------------------ tabs */

#tabs {
  display: flex;
  gap: 4px;
  padding: 0 20px;
  background: #fff;
  border-bottom: 1px solid var(--border);
}

#tabs button {
  border: none;
  background: none;
  padding: 10px 14px;
  font-size: 14px;
  cursor: pointer;
  color: var(--muted);
  border-bottom: 2px solid transparent;
}

#tabs button.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
  font-weight: 600;
}

main { padding: 20px; }
.tab { display: none; }
.tab.active { display: block; }

/* ------------------------------------------------------------ bookmarks tree */

.toolbar {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-bottom: 12px;
}

.toolbar input {
  flex: 1;
  max-width: 420px;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
}

#search-info { color: var(--muted); font-size: 13px; }

#tree details { margin: 2px 0; }
#tree details details { margin-left: 20px; }
#tree summary {
  cursor: pointer;
  padding: 3px 6px;
  border-radius: 6px;
  font-weight: 600;
  color: #374151;
  list-style-position: outside;
}
#tree summary:hover { background: #eceef2; }
#tree ul { list-style: none; margin: 0; padding-left: 0; }
#tree details ul { padding-left: 20px; }

#tree li { padding: 2px 6px; border-radius: 6px; }
#tree li a { color: #1d4ed8; text-decoration: none; }
#tree li a:hover { text-decoration: underline; }
#tree li .host { color: var(--muted); font-size: 12px; margin-left: 8px; }
#tree li.separator { color: #c4c8cf; user-select: none; }

#empty { color: var(--muted); padding: 24px 0; }

/* ------------------------------------------------------------ tables & forms */

table { width: 100%; border-collapse: collapse; background: #fff; }
th, td { text-align: left; padding: 8px 12px; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: 600; font-size: 13px; }

button, .button {
  padding: 7px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  font-size: 13px;
  cursor: pointer;
}
button:hover { background: #f0f2f5; }
button.danger { color: var(--danger); }
td button { margin-right: 6px; padding: 4px 10px; }

.card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  margin-bottom: 20px;
}
.card h2 { margin: 0 0 4px; font-size: 15px; }
.card form { margin-top: 10px; }

.row { display: flex; gap: 8px; }
.row input {
  flex: 1;
  max-width: 320px;
  padding: 7px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
}

#new-key { margin-top: 14px; padding: 12px; background: #eff6ff; border-radius: 8px; }
#new-key code {
  display: block;
  font-size: 14px;
  word-break: break-all;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 10px;
  user-select: all;
}

.hint { color: var(--muted); font-size: 13px; margin-top: 4px; }
.error { color: var(--danger); }

/* ------------------------------------------------------------ login page */

body.login {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}

.login-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
  width: 320px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
}

.login-card h1 { margin: 0; font-size: 18px; }
.login-card p { margin: 0; color: var(--muted); font-size: 13px; }
.login-card input {
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
}
.login-card button {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 10px;
  font-size: 14px;
}
.login-card button:hover { background: #1e40af; }