:root {
  --bg: #f2f2f7;
  --bg-elevated: rgba(255, 255, 255, 0.82);
  --bg-card: #ffffff;
  --text: #1c1c1e;
  --muted: #6c6c70;
  --border: rgba(60, 60, 67, 0.12);
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
  --accent: #007aff;
  --accent-soft: rgba(0, 122, 255, 0.12);
  --success: #34c759;
  --warning: #ff9f0a;
  --danger: #ff3b30;
  --info: #64d2ff;
  --radius: 18px;
  --radius-sm: 12px;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, sans-serif;
  --sidebar-width: 260px;
}

html[data-theme="dark"] {
  --bg: #000000;
  --bg-elevated: rgba(28, 28, 30, 0.86);
  --bg-card: #1c1c1e;
  --text: #f5f5f7;
  --muted: #8e8e93;
  --border: rgba(84, 84, 88, 0.45);
  --shadow: 0 12px 36px rgba(0, 0, 0, 0.45);
  --accent: #0a84ff;
  --accent-soft: rgba(10, 132, 255, 0.18);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: var(--font);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(0, 122, 255, 0.12), transparent 55%),
    radial-gradient(900px 500px at 100% 0%, rgba(52, 199, 89, 0.08), transparent 50%),
    var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

button, input, select, textarea { font: inherit; }
a { color: var(--accent); }

.hidden { display: none !important; }
.muted { color: var(--muted); }
.stack { display: grid; gap: 14px; }
.row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.grid { display: grid; gap: 16px; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.glass {
  background: var(--bg-elevated);
  backdrop-filter: blur(18px) saturate(1.2);
  -webkit-backdrop-filter: blur(18px) saturate(1.2);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px;
}

.card h3 { margin: 0 0 8px; font-size: 1.05rem; }
.card .value { font-size: 1.55rem; font-weight: 700; letter-spacing: -0.02em; }
.card .label { color: var(--muted); font-size: 0.9rem; }

.dash-row {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  align-items: stretch;
}
.card-title {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  align-self: flex-start;
  width: 100%;
}
.chart-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  min-height: 260px;
}
.chart-card .card-title { margin-bottom: 2px; }
.resources-card {
  align-items: stretch;
}
.resources-card .resource-bars {
  width: 100%;
  margin-top: 4px;
  flex: 1;
  gap: 2px;
}
.resources-card .resource-row .muted {
  margin: 0;
}
.ring-wrap {
  position: relative;
  width: 168px;
  height: 168px;
}
.ring-wrap svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.ring-wrap .ring-bg { fill: none; stroke: var(--border); stroke-width: 14; }
.ring-wrap .ring-fg { fill: none; stroke-width: 14; stroke-linecap: round; transition: stroke-dashoffset 0.45s ease; }
.ring-wrap .conic-ring {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  mask: radial-gradient(circle at center, transparent 54%, #000 55%);
  -webkit-mask: radial-gradient(circle at center, transparent 54%, #000 55%);
}
.ring-wrap .ring-center {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  text-align: center;
  pointer-events: none;
}
.ring-wrap .ring-center strong {
  display: block;
  font-size: 1.7rem;
  letter-spacing: -0.03em;
  line-height: 1.1;
}
.ring-wrap .ring-center span { color: var(--muted); font-size: 0.82rem; }
.chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  justify-content: center;
  width: 100%;
  font-size: 0.9rem;
  color: var(--muted);
}
.chart-legend i {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  margin-right: 6px;
}
.split-card { display: grid; gap: 16px; }
.split-card .split-block + .split-block {
  border-top: 1px solid var(--border);
  padding-top: 14px;
}
.resource-bars { display: grid; gap: 14px; }
.resource-row { display: grid; gap: 6px; }
.resource-row .meta {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  font-size: 0.92rem;
}
.resource-row .meta strong { font-weight: 700; }
.meter {
  height: 10px;
  border-radius: 999px;
  background: var(--border);
  overflow: hidden;
}
.meter > span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), #5ac8fa);
}
.meter.warn > span { background: linear-gradient(90deg, var(--warning), #ffd60a); }
.meter.bad > span { background: linear-gradient(90deg, var(--danger), #ff6961); }

.dash-stats-row {
  margin-top: 16px;
}
.stats-card {
  display: grid;
  gap: 10px;
}
.stats-card .stats-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
}
.stats-card .stats-head .card-title {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0;
}
.stats-card .stats-note {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.35;
}
.stats-table .cell-time {
  white-space: nowrap;
  color: var(--muted);
  font-size: 0.88rem;
}
.stats-table .cell-resource strong {
  word-break: break-all;
}
.stats-table .cell-traffic {
  display: grid;
  gap: 2px;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

@media (max-width: 1100px) {
  .dash-row { grid-template-columns: 1fr; }
}

.ui-icon {
  width: 1.15rem;
  height: 1.15rem;
  display: inline-block;
  flex-shrink: 0;
  background-color: currentColor;
  -webkit-mask: var(--ui-icon) center / contain no-repeat;
  mask: var(--ui-icon) center / contain no-repeat;
  vertical-align: -0.15em;
}
.ui-icon.lg { width: 1.35rem; height: 1.35rem; }
.ui-icon[data-icon="dashboard"] { --ui-icon: url("/icons/dashboard.svg"); }
.ui-icon[data-icon="stats"] { --ui-icon: url("/icons/stats.svg"); }
.ui-icon[data-icon="clients"] { --ui-icon: url("/icons/clients.svg"); }
.ui-icon[data-icon="groups"] { --ui-icon: url("/icons/groups.svg"); }
.ui-icon[data-icon="server"] { --ui-icon: url("/icons/server.svg"); }
.ui-icon[data-icon="logs"] { --ui-icon: url("/icons/logs.svg"); }
.ui-icon[data-icon="backup"] { --ui-icon: url("/icons/backup.svg"); }
.ui-icon[data-icon="settings"] { --ui-icon: url("/icons/settings.svg"); }
.ui-icon[data-icon="logout"] { --ui-icon: url("/icons/logout.svg"); }
.ui-icon[data-icon="login"] { --ui-icon: url("/icons/login.svg"); }
.ui-icon[data-icon="refresh"] { --ui-icon: url("/icons/refresh.svg"); }
.ui-icon[data-icon="menu"] { --ui-icon: url("/icons/menu.svg"); }
.ui-icon[data-icon="edit"] { --ui-icon: url("/icons/edit.svg"); }
.ui-icon[data-icon="download"] { --ui-icon: url("/icons/download.svg"); }
.ui-icon[data-icon="revoke"] { --ui-icon: url("/icons/revoke.svg"); }
.ui-icon[data-icon="delete"] { --ui-icon: url("/icons/delete.svg"); }
.ui-icon[data-icon="sync"] { --ui-icon: url("/icons/sync.svg"); }
.ui-icon[data-icon="plus"] { --ui-icon: url("/icons/plus.svg"); }
.ui-icon[data-icon="play"] { --ui-icon: url("/icons/play.svg"); }
.ui-icon[data-icon="stop"] { --ui-icon: url("/icons/stop.svg"); }
.ui-icon[data-icon="restart"] { --ui-icon: url("/icons/restart.svg"); }
.ui-icon[data-icon="check"] { --ui-icon: url("/icons/check.svg"); }
.ui-icon[data-icon="warning"] { --ui-icon: url("/icons/warning.svg"); }
.ui-icon[data-icon="shield"] { --ui-icon: url("/icons/shield.svg"); }
.ui-icon[data-icon="stats"] { --ui-icon: url("/icons/stats.svg"); }

.btn {
  border: 0;
  border-radius: 14px;
  padding: 11px 16px;
  cursor: pointer;
  transition: transform 0.15s ease, opacity 0.15s ease, background 0.15s ease;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}
.btn:active { transform: scale(0.98); }
.btn:disabled { opacity: 0.55; cursor: not-allowed; }
.btn-block { width: 100%; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-secondary { background: var(--accent-soft); color: var(--accent); }
.btn-danger { background: rgba(255, 59, 48, 0.14); color: var(--danger); }
.btn-ghost { background: transparent; color: var(--text); border: 1px solid var(--border); }

.field { display: grid; gap: 6px; }
.field span { color: var(--muted); font-size: 0.9rem; }
.field input, .field select, .field textarea,
input[type="text"], input[type="password"], input[type="search"], select, textarea {
  width: 100%;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text);
  border-radius: 14px;
  padding: 12px 14px;
  outline: none;
}
.field input:focus, input:focus, select:focus, textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}
.form-error { color: var(--danger); margin: 0; }

.pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border-radius: 999px;
  padding: 7px 12px;
  font-size: 0.85rem;
  font-weight: 600;
  background: var(--accent-soft);
  color: var(--accent);
}
.pill::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: currentColor;
}
.pill.ok { background: rgba(52, 199, 89, 0.15); color: var(--success); }
.pill.warn { background: rgba(255, 159, 10, 0.16); color: var(--warning); }
.pill.bad { background: rgba(255, 59, 48, 0.14); color: var(--danger); }
.pill.unknown { background: rgba(142, 142, 147, 0.18); color: var(--muted); }

.view-login {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}
.login-card {
  width: min(420px, 100%);
  border-radius: 28px;
  padding: 28px;
}
.brand { text-align: center; margin-bottom: 22px; }
.brand h1 { margin: 12px 0 6px; font-size: 1.7rem; letter-spacing: -0.03em; }
.brand p { margin: 0; color: var(--muted); }
.brand-mark {
  width: 56px;
  height: 56px;
  margin: 0 auto;
  border-radius: 16px;
  background:
    linear-gradient(145deg, #0a84ff, #5ac8fa 55%, #34c759);
  box-shadow: 0 10px 24px rgba(10, 132, 255, 0.35);
}
.brand-mark.sm { width: 36px; height: 36px; border-radius: 12px; margin: 0; }

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
}
.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 20px 14px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  border-right: 1px solid var(--border);
}
.sidebar-brand {
  display: flex;
  gap: 12px;
  align-items: center;
  padding: 8px 10px;
}
.sidebar-brand strong { display: block; }
.sidebar-brand span { color: var(--muted); font-size: 0.85rem; }
.nav { display: grid; gap: 6px; }
.nav-item {
  text-align: left;
  border: 0;
  background: transparent;
  color: var(--text);
  border-radius: 14px;
  padding: 12px 14px;
  cursor: pointer;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 10px;
}
.nav-item .ui-icon {
  width: 1.25rem;
  height: 1.25rem;
  opacity: 0.92;
}
.nav-item.active, .nav-item:hover {
  background: var(--accent-soft);
  color: var(--accent);
}
.sidebar-foot { margin-top: auto; display: grid; gap: 8px; }

.main { padding: 22px; min-width: 0; }
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}
.topbar h2 { margin: 0; letter-spacing: -0.02em; }
.topbar p { margin: 4px 0 0; }
.topbar-actions { display: flex; gap: 10px; align-items: center; }
.menu-btn { display: none; }

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 14px;
  align-items: center;
}
.toolbar .grow { flex: 1; min-width: 180px; }

.clients-toolbar {
  align-items: stretch;
}
.clients-toolbar .filters-row {
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  gap: 10px;
  flex: 1 1 360px;
  min-width: 0;
}
.clients-toolbar .filters-row select {
  flex: 1 1 0;
  min-width: 0;
}
.clients-toolbar .toolbar-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

@media (max-width: 860px) {
  .clients-toolbar .grow,
  .clients-toolbar .filters-row,
  .clients-toolbar .toolbar-actions {
    flex: 1 1 100%;
    width: 100%;
  }
  .clients-toolbar .filters-row {
    flex-direction: column;
    flex-wrap: wrap;
  }
  .clients-toolbar .filters-row select {
    width: 100%;
    flex: 1 1 auto;
  }
  .clients-toolbar .toolbar-actions {
    flex-direction: column;
  }
  .clients-toolbar .toolbar-actions .btn {
    width: 100%;
  }
}

.table-wrap { overflow: auto; border-radius: var(--radius); border: 1px solid var(--border); background: var(--bg-card); }
table { width: 100%; border-collapse: collapse; min-width: 720px; }
th, td { padding: 12px 14px; text-align: left; border-bottom: 1px solid var(--border); vertical-align: top; }
th { color: var(--muted); font-size: 0.82rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.04em; }
tr:last-child td { border-bottom: 0; }

.clients-table {
  table-layout: fixed;
  width: 100%;
  min-width: 780px;
}
.clients-table .col-client { width: auto; }
.clients-table .col-group { width: 9.5rem; }
.clients-table .col-status { width: 10.5rem; }
.clients-table .col-ip { width: 8.5rem; }
.clients-table .col-traffic { width: 7.5rem; }
.clients-table .col-actions { width: 11.5rem; }
.clients-table th,
.clients-table td {
  vertical-align: middle;
  height: 64px;
  box-sizing: border-box;
}
.clients-table .client-cell {
  min-width: 0;
}
.clients-table .client-cell strong,
.clients-table .client-cell .muted {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.clients-table .client-cell .muted { margin-top: 2px; }
.clients-table .cell-group,
.clients-table .cell-status,
.clients-table .cell-ip {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.clients-table .cell-traffic {
  white-space: nowrap;
}
.clients-table .cell-traffic span {
  display: block;
  line-height: 1.25;
}
.clients-table .actions {
  display: flex;
  gap: 6px;
  flex-wrap: nowrap;
  align-items: center;
  justify-content: flex-start;
}
.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
  justify-content: center;
  flex-shrink: 0;
}
.btn-icon .ui-icon {
  width: 1.2rem;
  height: 1.2rem;
  margin: 0;
}

.log-box {
  background: #0b1220;
  color: #d7e3ff;
  border-radius: var(--radius);
  padding: 16px;
  min-height: 320px;
  max-height: 60vh;
  overflow: auto;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.85rem;
  line-height: 1.45;
  white-space: pre-wrap;
}
html[data-theme="light"] .log-box { background: #111827; }

.toast-root {
  position: fixed;
  right: 16px;
  top: 16px;
  z-index: 50;
  display: grid;
  gap: 10px;
  width: min(360px, calc(100vw - 32px));
}
.toast {
  border-radius: 16px;
  padding: 12px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  animation: slide-in 0.22s ease;
}
.toast.success { border-color: rgba(52, 199, 89, 0.35); }
.toast.error { border-color: rgba(255, 59, 48, 0.35); }
.toast.info { border-color: rgba(10, 132, 255, 0.35); }

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.35);
  display: grid;
  place-items: center;
  z-index: 40;
  padding: 20px;
}
.modal {
  width: min(460px, 100%);
  border-radius: 22px;
  padding: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.modal h3 { margin: 0 0 8px; }
.modal p { margin: 0 0 16px; color: var(--muted); }
.modal-actions { display: flex; justify-content: flex-end; gap: 10px; }

.global-loading {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.12);
  display: grid;
  place-items: center;
  z-index: 60;
}
.spinner {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 3px solid rgba(255, 255, 255, 0.35);
  border-top-color: var(--accent);
  animation: spin 0.8s linear infinite;
}

.empty {
  padding: 28px;
  text-align: center;
  color: var(--muted);
}

@keyframes spin { to { transform: rotate(360deg); } }
@keyframes slide-in {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 1100px) {
  .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 860px) {
  .app-shell { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: min(84vw, 300px);
    transform: translateX(-105%);
    transition: transform 0.2s ease;
    z-index: 30;
  }
  .sidebar.open { transform: translateX(0); }
  .menu-btn { display: inline-flex; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .main { padding: 14px; }
  .topbar { align-items: flex-start; }
  .topbar-actions { margin-left: auto; }
}