:root {
  --bg: #eef1f3;
  --surface: #ffffff;
  --surface-2: #e4eaed;
  --ink: #0f2027;
  --muted: #55707c;
  --accent: #0f7a75;
  --accent-ink: #ffffff;
  --warn: #c2410c;
  --warn-soft: #fbe6da;
  --ok-soft: #dcf1ee;
  --border: #d2dbdf;
  --font: "IBM Plex Sans", ui-sans-serif, system-ui, -apple-system, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1418; --surface: #101c22; --surface-2: #16242b; --ink: #e7f1f2;
    --muted: #8fa8ae; --accent: #35d6c8; --accent-ink: #06201d; --warn: #f2994a;
    --warn-soft: #3a2413; --ok-soft: #103330; --border: #1f2f36;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: var(--font); font-size: 14px; }
.muted { color: var(--muted); font-size: 12px; }
.error { color: var(--warn); font-size: 13px; margin: 0; }

/* login */
.login-screen { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 24px; }
.login-card { background: var(--surface); border: 1px solid var(--border); border-radius: 16px; padding: 32px; width: 340px; display: flex; flex-direction: column; gap: 14px; }
.login-card h1 { margin: 0; font-size: 24px; }
.login-card label { display: flex; flex-direction: column; gap: 6px; font-size: 12px; color: var(--muted); }
.login-card input { padding: 10px 12px; border-radius: 8px; border: 1px solid var(--border); background: var(--bg); color: var(--ink); font-size: 15px; }
.login-card button { padding: 11px; border-radius: 8px; border: none; background: var(--accent); color: var(--accent-ink); font-weight: 600; font-size: 15px; cursor: pointer; }

/* shell */
.app { max-width: 1280px; margin: 0 auto; padding: 0 20px 64px; }
.topbar { display: flex; align-items: center; gap: 20px; padding: 16px 0; flex-wrap: wrap; }
.brand { font-weight: 700; font-size: 17px; }
.topbar-right { margin-left: auto; display: flex; align-items: center; gap: 12px; }
.tabs { display: flex; gap: 4px; }
.tab { border: 1px solid transparent; background: none; color: var(--muted); padding: 7px 14px; border-radius: 8px; cursor: pointer; font-size: 13px; font-family: inherit; }
.tab:hover { background: var(--surface-2); }
.tab.is-active { background: var(--surface); border-color: var(--border); color: var(--ink); font-weight: 600; }
.ghost { background: none; border: 1px solid var(--border); border-radius: 8px; padding: 6px 12px; cursor: pointer; color: var(--ink); font-family: inherit; font-size: 13px; }

/* panels */
.panel { background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 18px 20px; margin-bottom: 18px; }
.panel h2 { font-size: 14px; margin: 0 0 12px; }
.panel-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 12px; flex-wrap: wrap; }
.panel-head h2 { margin: 0; }
.panel-head button, .panel-head select { border: 1px solid var(--border); background: var(--surface-2); color: var(--ink); border-radius: 8px; padding: 6px 12px; cursor: pointer; font-family: inherit; font-size: 13px; }
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
@media (max-width: 820px) { .split { grid-template-columns: 1fr; } }

/* stats */
.stat-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 12px; margin-bottom: 18px; }
@media (max-width: 980px) { .stat-grid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 560px) { .stat-grid { grid-template-columns: repeat(2, 1fr); } }
.stat { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 14px 16px; }
.stat-value { font-size: 26px; font-weight: 700; font-variant-numeric: tabular-nums; font-family: var(--mono); }
.stat-label { font-size: 11px; color: var(--muted); margin-top: 4px; }
.stat.alert .stat-value { color: var(--warn); }

/* key/value */
.kv { display: grid; grid-template-columns: 1fr auto; gap: 8px 16px; margin: 0; }
.kv dt { color: var(--muted); font-size: 13px; }
.kv dd { margin: 0; font-family: var(--mono); font-variant-numeric: tabular-nums; }

/* forms */
.inline-form { display: flex; flex-wrap: wrap; gap: 10px; align-items: flex-end; margin-bottom: 16px; padding-bottom: 16px; border-bottom: 1px solid var(--border); }
.inline-form label { display: flex; flex-direction: column; gap: 4px; font-size: 11px; color: var(--muted); }
.inline-form input, .inline-form select { padding: 7px 9px; border-radius: 7px; border: 1px solid var(--border); background: var(--bg); color: var(--ink); font-size: 13px; font-family: inherit; }
.inline-form input[name="domain"] { min-width: 200px; }
.inline-form button { padding: 8px 16px; border-radius: 7px; border: none; background: var(--accent); color: var(--accent-ink); font-weight: 600; cursor: pointer; font-family: inherit; font-size: 13px; }

/* tables */
.table-scroll { overflow-x: auto; }
.data-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.data-table th { text-align: left; color: var(--muted); font-weight: 600; font-size: 10.5px; text-transform: uppercase; letter-spacing: .05em; padding: 0 10px 8px 0; border-bottom: 1px solid var(--border); white-space: nowrap; }
.data-table td { padding: 9px 10px 9px 0; border-bottom: 1px solid var(--border); font-variant-numeric: tabular-nums; white-space: nowrap; }
.data-table tr:last-child td { border-bottom: none; }
.data-table td.wrap { white-space: normal; }
.mono { font-family: var(--mono); }

/* badges */
.badge { display: inline-block; font-size: 10.5px; font-weight: 700; padding: 3px 9px; border-radius: 999px; white-space: nowrap; }
.badge.online, .badge.ok { background: var(--ok-soft); color: var(--accent); }
.badge.offline { background: var(--surface-2); color: var(--muted); }
.badge.vpn, .badge.fail { background: var(--warn-soft); color: var(--warn); }
.link-btn { border: none; background: none; color: var(--accent); cursor: pointer; font-family: inherit; font-size: 13px; padding: 0; text-decoration: underline; }
.danger-btn { border: none; background: none; color: var(--warn); cursor: pointer; font-family: inherit; font-size: 13px; padding: 0; }
.empty { color: var(--muted); padding: 14px 0; }