:root {
  --bg: #0d1117;
  --bg-elev: #161b22;
  --bg-elev2: #1f2630;
  --border: #2a313c;
  --text: #e6edf3;
  --muted: #8b949e;
  --primary: #4f8cff;
  --primary-hover: #6aa0ff;
  --danger: #f85149;
  --success: #3fb950;
  --warn: #d29922;
  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 4px 12px rgba(0,0,0,.35);
  --mono: ui-monospace, SFMono-Regular, "JetBrains Mono", Menlo, monospace;
}

* { box-sizing: border-box; }
html, body { margin:0; padding:0; background: var(--bg); color: var(--text); font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", sans-serif; -webkit-font-smoothing: antialiased; }
.hidden { display: none !important; }
.muted { color: var(--muted); font-weight: normal; }
.error { color: var(--danger); font-size: 13px; min-height: 18px; margin-top: 6px; }

/* Login */
.login-screen { min-height: 100vh; display: grid; place-items: center; padding: 24px; }
.login-screen .card { width: 100%; max-width: 380px; padding: 28px; }
.login-screen h1 { margin: 0 0 20px; font-size: 24px; }
.login-screen label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 12px; }
.login-screen input { display: block; width: 100%; margin-top: 6px; padding: 10px 12px; background: var(--bg-elev2); border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--text); font-size: 14px; }
.login-screen input:focus { outline: none; border-color: var(--primary); }
.login-screen button { width: 100%; margin-top: 8px; }

/* App layout */
.app { min-height: 100vh; display: flex; flex-direction: column; }
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 24px; background: var(--bg-elev); border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 10;
}
.brand { display: flex; align-items: center; gap: 12px; }
.logo {
  width: 36px; height: 36px; border-radius: 8px;
  background: linear-gradient(135deg, #4f8cff 0%, #2a5dd9 100%);
  position: relative;
}
.logo::before {
  content: "V"; position: absolute; inset: 0; display: grid; place-items: center;
  font-weight: 700; color: #fff; font-size: 18px;
}
.title { font-size: 15px; font-weight: 600; }
.subtitle { font-size: 12px; color: var(--muted); margin-top: 2px; display: flex; align-items: center; gap: 8px; }
.dot { display: inline-flex; align-items: center; gap: 6px; }
.dot::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--muted); display: inline-block; }
.dot-on::before { background: var(--success); box-shadow: 0 0 8px var(--success); }
.dot-off::before { background: var(--danger); }
.topbar-actions { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; justify-content: flex-end; }
@media (max-width: 700px) {
  .search { width: 100%; }
  .topbar { flex-wrap: wrap; gap: 12px; }
  .topbar-actions { width: 100%; }
}

.main { flex: 1; padding: 20px 24px; width: 100%; max-width: none; margin: 0; display: flex; flex-direction: column; gap: 20px; }
.footer { padding: 16px 24px; color: var(--muted); font-size: 12px; text-align: center; border-top: 1px solid var(--border); }

/* Card */
.card { background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); }
.card-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 20px; border-bottom: 1px solid var(--border);
}
.section-title { font-size: 16px; font-weight: 600; }
.section-sub { font-size: 12px; color: var(--muted); margin-top: 2px; }

/* Buttons */
.btn {
  appearance: none; border: 1px solid var(--border); background: var(--bg-elev2); color: var(--text);
  padding: 8px 14px; border-radius: var(--radius-sm); font-size: 13px; font-weight: 500; cursor: pointer;
  transition: background .15s, border-color .15s, transform .05s;
  display: inline-flex; align-items: center; gap: 6px;
}
.btn:hover { background: #2a3340; }
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); border-color: var(--primary-hover); }
.btn-danger { background: transparent; border-color: var(--border); color: var(--danger); }
.btn-danger:hover { background: rgba(248,81,73,.1); border-color: var(--danger); }
.btn-ghost { background: transparent; border-color: transparent; color: var(--muted); padding: 6px 10px; }
.btn-ghost:hover { background: var(--bg-elev2); color: var(--text); }
.btn-icon { padding: 6px 8px; }

/* User list */
.user-list { display: flex; flex-direction: column; }
.user-list:empty::before {
  content: "Нет пользователей"; display: block; padding: 32px; text-align: center; color: var(--muted); font-size: 13px;
}
.user-row {
  display: grid; grid-template-columns: 36px 1fr auto; gap: 14px; align-items: center;
  padding: 12px 20px; border-bottom: 1px solid var(--border);
}
.user-row:last-child { border-bottom: none; }
.user-row:hover { background: rgba(255,255,255,.02); }
.user-avatar {
  width: 36px; height: 36px; border-radius: 50%; display: grid; place-items: center;
  font-weight: 600; font-size: 13px; color: #fff;
}
.user-meta { min-width: 0; }
.user-name { font-weight: 600; font-size: 14px; display: flex; align-items: center; gap: 8px; }
.user-name .badge { font-size: 10px; font-weight: 500; padding: 2px 6px; background: var(--bg-elev2); border: 1px solid var(--border); border-radius: 4px; color: var(--muted); }
.user-uri { font-family: var(--mono); font-size: 11px; color: var(--muted); margin-top: 2px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.user-actions { display: flex; gap: 4px; align-items: center; }
.user-name .label-text { color: var(--text); }
.user-name .login-id { font-size: 11px; color: var(--muted); font-weight: 400; font-family: var(--mono); }
.user-group { font-size: 10px; padding: 1px 6px; border-radius: 8px; background: rgba(79,140,255,.15); color: var(--primary); border: 1px solid rgba(79,140,255,.3); }
.user-ip { font-family: var(--mono); font-size: 11px; color: var(--text); }
.user-ip.stale { color: var(--muted); }
.user-traffic { font-family: var(--mono); font-size: 11px; color: var(--success); }

/* Topology diagram */
.topology { padding: 20px; overflow-x: auto; }

/* RU = red, NL = blue — theme colours */
:root {
  --ru: #e5484d;
  --ru-weak: rgba(229,72,77,.35);
  --ru-bg: rgba(229,72,77,.06);
  --nl: #4f8cff;
  --nl-weak: rgba(79,140,255,.35);
  --nl-bg: rgba(79,140,255,.06);
  --muted2: rgba(139,148,158,.55);
}

/* ─── 4-column topology with SVG arrow overlay ─── */
.topo-wrap {
  position: relative;
  display: grid;
  /* client  gap   CF-edge   gap   RU-frame              gap   NL-frame               gap   endpoints */
  grid-template-columns: auto minmax(80px, .6fr) auto minmax(110px, .9fr) auto minmax(110px, .9fr) auto minmax(110px, .9fr) auto;
  gap: 0;
  align-items: center;
  min-width: max-content;
  padding: 24px 8px 110px 8px;
}
.topo-col { display: flex; flex-direction: column; gap: 12px; align-items: stretch; min-width: 190px; }
.topo-col-client     { grid-column: 1; }
.topo-col-edge       { grid-column: 3; }
.topo-col-ru         { grid-column: 5; align-self: stretch; }
.topo-col-nl         { grid-column: 7; }
.topo-col-endpoints  { grid-column: 9; }

/* SVG overlay sits behind boxes but in front of background */
.topo-svg {
  position: absolute; top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  z-index: 0;
}
.topo-wrap > .topo-col, .topo-wrap > .topo-col * { position: relative; z-index: 1; }

.topo-col .topo-box { min-width: 190px; }

/* RU frame: everything stacked vertically in one column */
.topo-col-ru .topo-frame.ru {
  padding: 26px 14px 14px; display: flex; flex-direction: column; gap: 10px;
}
.topo-col-nl .topo-frame.nl {
  padding: 26px 14px 14px; display: flex; flex-direction: column;
}

/* SVG path + label styles */
.tarr { fill: none; stroke-width: 2; }
.tarr-proxy { stroke: var(--nl); }
.tarr-bypass { stroke: var(--muted); stroke-dasharray: 6 5; }
.tarr-label {
  display: inline-block; font-family: var(--mono); font-size: 10px;
  padding: 2px 8px; border-radius: 4px;
  background: var(--bg-elev); white-space: nowrap;
  text-align: center; line-height: 1.4;
  transform: translateY(-1px);
}
.tarr-label-proxy { color: var(--nl); border: 1px solid var(--nl); }
.tarr-label-bypass { color: var(--muted); border: 1px solid var(--muted); font-style: italic; }

/* Flag text-badges */
.flag {
  display: inline-block; font-size: 10px; font-weight: 800; letter-spacing: .6px;
  padding: 1px 6px; border-radius: 3px; vertical-align: middle; margin-right: 4px;
}
.flag-ru { background: var(--ru); color: #fff; }
.flag-nl { background: var(--nl); color: #fff; }
.flag-cf { background: #f38020; color: #fff; }

/* Server frames (RU/NL grouping) */
.topo-frame {
  position: relative; padding: 22px 14px 14px; border-radius: 10px;
  display: flex; align-items: stretch; gap: 6px;
}
.topo-frame.ru { border: 1px dashed var(--ru-weak); background: var(--ru-bg); }
.topo-frame.nl { border: 1px dashed var(--nl-weak); background: var(--nl-bg); }
.topo-frame.cf { border: 1px dashed rgba(243,128,32,.5); background: rgba(243,128,32,.06); padding: 26px 14px 14px; display: flex; flex-direction: column; }
.topo-frame.cf > .topo-frame-label { color: #f38020; border: 1px solid rgba(243,128,32,.5); }
.topo-frame-label {
  position: absolute; top: -10px; left: 14px; padding: 2px 10px;
  background: var(--bg-elev); font-size: 11px; font-weight: 600; letter-spacing: .3px;
  border-radius: 6px; white-space: nowrap; display: flex; align-items: center; gap: 4px;
}
.topo-frame.ru > .topo-frame-label { color: var(--ru); border: 1px solid var(--ru-weak); }
.topo-frame.nl > .topo-frame-label { color: var(--nl); border: 1px solid var(--nl-weak); }
.topo-frame-aux { flex-direction: column; margin-top: 18px; }
.topo-aux-row { display: flex; align-items: center; gap: 6px; }
.topo-aux-gap { flex: 0 0 18px; }

/* Arrow between boxes — spans FULL cell width, clearly visible */
.topo-arrow {
  width: 100%; height: 100%;
  display: flex; align-items: center; justify-content: center;
  position: relative; font-size: 10px;
}
.topo-arrow-line {
  position: absolute; top: 50%; left: 0; right: 12px; height: 2px;
  background: var(--primary); transform: translateY(-50%);
}
.topo-arrow-head {
  position: absolute; top: 50%; right: 0; transform: translateY(-50%);
  font-size: 16px; color: var(--primary); line-height: 1;
}
.topo-arrow-label {
  position: relative; z-index: 1; background: var(--bg-elev);
  padding: 2px 8px; border-radius: 4px;
  font-family: var(--mono); white-space: nowrap;
  border: 1px solid var(--primary); color: var(--primary);
  box-shadow: 0 0 0 2px var(--bg-elev);
}

/* Bypass arrow — dashed muted */
.topo-arrow-bypass .topo-arrow-line {
  background: transparent; border-top: 2px dashed var(--muted); height: 0;
}
.topo-arrow-bypass .topo-arrow-head { color: var(--muted); }
.topo-arrow-bypass .topo-arrow-label {
  color: var(--muted); border-color: var(--muted); font-style: italic;
}

/* Node box */
.topo-box {
  flex: 1 1 0; min-width: 160px; max-width: 240px;
  background: var(--bg-elev2); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 10px 12px; position: relative;
}
.topo-box.up { border-color: rgba(63,185,80,.5); box-shadow: 0 0 0 1px rgba(63,185,80,.15) inset; }
.topo-box.down { border-color: rgba(248,81,73,.5); box-shadow: 0 0 0 1px rgba(248,81,73,.15) inset; }
.topo-box.pending { opacity: .7; }
.topo-box.dim { background: transparent; border-style: dashed; opacity: .85; }

.topo-box-head { display: flex; align-items: center; gap: 6px; }
.topo-dot { font-size: 10px; line-height: 1; }
.topo-box.up .topo-dot { color: var(--success); }
.topo-box.down .topo-dot { color: var(--danger); }
.topo-box.pending .topo-dot { color: var(--muted); }
.topo-title { font-size: 13px; font-weight: 600; color: var(--text); flex: 1; }

/* Host tag (RU/NL) */
.topo-host {
  font-size: 9px; font-weight: 700; padding: 1px 5px; border-radius: 3px; letter-spacing: .5px;
}
.topo-host-ru { color: var(--ru); background: rgba(229,72,77,.13); border: 1px solid var(--ru-weak); }
.topo-host-nl { color: var(--nl); background: rgba(79,140,255,.13); border: 1px solid var(--nl-weak); }

.topo-box-sub { font-family: var(--mono); font-size: 10px; color: var(--muted); margin-top: 3px; word-break: break-all; }
.topo-box-meta { font-family: var(--mono); font-size: 10px; color: var(--muted); margin-top: 4px; }
.topo-box.up .topo-box-meta { color: var(--success); }
.topo-box.down .topo-box-meta { color: var(--danger); }
.topo-box-hint { font-size: 10px; color: var(--muted); margin-top: 4px; opacity: .8; line-height: 1.3; }

/* Search box */
.search { background: var(--bg-elev2); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 7px 12px; font-size: 13px; color: var(--text); width: 240px; }
.search:focus { outline: none; border-color: var(--primary); }

/* Chips (group filters) */
.chips { display: flex; flex-wrap: wrap; gap: 6px; padding: 10px 20px; border-bottom: 1px solid var(--border); }
.chips:empty { display: none; }
.chip { font-size: 12px; padding: 4px 10px; border-radius: 12px; background: var(--bg-elev2); border: 1px solid var(--border); color: var(--muted); cursor: pointer; user-select: none; }
.chip:hover { color: var(--text); }
.chip.active { background: var(--primary); border-color: var(--primary); color: #fff; }
.chip .count { opacity: .7; margin-left: 4px; }

/* Modal */
.modal { position: fixed; inset: 0; background: rgba(0,0,0,.6); display: grid; place-items: center; z-index: 100; padding: 16px; }
.modal-card { background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius); width: 100%; max-width: 480px; box-shadow: var(--shadow); }
.modal-head { display: flex; align-items: center; justify-content: space-between; padding: 14px 20px; border-bottom: 1px solid var(--border); font-weight: 600; }
.modal-body { padding: 20px; }
.modal-body label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 14px; }
.modal-body input, .modal-body textarea {
  display: block; width: 100%; margin-top: 6px; padding: 9px 12px;
  background: var(--bg-elev2); border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--text); font-size: 14px; font-family: inherit;
}
.modal-body textarea { font-family: var(--mono); font-size: 12px; min-height: 80px; resize: vertical; }
.modal-body input:focus, .modal-body textarea:focus { outline: none; border-color: var(--primary); }
.modal-actions { display: flex; gap: 8px; justify-content: flex-end; margin-top: 8px; }
.uri-block { background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 10px 12px; font-family: var(--mono); font-size: 12px; word-break: break-all; color: var(--text); margin-bottom: 12px; }

/* Toast */
.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  background: var(--bg-elev2); border: 1px solid var(--border); padding: 10px 16px; border-radius: var(--radius-sm);
  box-shadow: var(--shadow); font-size: 13px; z-index: 200; transition: opacity .2s;
}
.toast.error { border-color: var(--danger); color: var(--danger); }
.toast.success { border-color: var(--success); color: var(--success); }

/* Toggle switch */
.switch { position: relative; width: 36px; height: 20px; display: inline-block; }
.switch input { opacity: 0; width: 0; height: 0; }
.switch .slider { position: absolute; cursor: pointer; inset: 0; background: var(--bg-elev2); border: 1px solid var(--border); transition: .15s; border-radius: 10px; }
.switch .slider::before { content: ""; position: absolute; height: 14px; width: 14px; left: 2px; top: 2px; background: var(--muted); transition: .15s; border-radius: 50%; }
.switch input:checked + .slider { background: rgba(63,185,80,.2); border-color: var(--success); }
.switch input:checked + .slider::before { background: var(--success); transform: translateX(16px); }

/* Disabled row look */
.user-row.disabled .user-avatar { filter: grayscale(.7) opacity(.6); }
.user-row.disabled .user-name { color: var(--muted); }
.user-row.disabled .user-uri { text-decoration: line-through; opacity: .5; }

.user-comment { font-size: 11px; color: var(--muted); margin-top: 2px; font-style: italic; }
.user-meta-row { display: flex; gap: 10px; font-size: 11px; color: var(--muted); margin-top: 4px; align-items: center; }
.user-meta-row .pill { background: var(--bg-elev2); border: 1px solid var(--border); padding: 2px 8px; border-radius: 10px; }
.user-meta-row .pill.active { color: var(--success); border-color: var(--success); }

/* Connections list */
.conn-list { max-height: 320px; overflow-y: auto; }
.conn-list:empty::before { content: "Нет активных соединений"; display: block; padding: 24px; text-align: center; color: var(--muted); font-size: 13px; }
.conn-row {
  display: grid; grid-template-columns: 140px minmax(0, 1fr) 190px 90px 60px; gap: 14px; align-items: center;
  padding: 8px 20px; border-bottom: 1px solid var(--border); font-size: 12px;
}
.conn-row:last-child { border-bottom: none; }
.conn-row > div { min-width: 0; }
.conn-row .src { font-family: var(--mono); font-size: 11px; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.conn-row .host { font-family: var(--mono); font-size: 11px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.conn-row .chain { font-size: 10px; padding: 2px 6px; border-radius: 4px; background: var(--bg-elev2); border: 1px solid var(--border); color: var(--muted); justify-self: start; }
.conn-row .chain.direct { color: var(--success); border-color: rgba(63,185,80,.3); }
.conn-row .chain.proxy  { color: var(--primary); border-color: rgba(79,140,255,.3); }
.conn-row .traffic { font-family: var(--mono); font-size: 11px; text-align: right; color: var(--text); }
.conn-row .since { font-size: 11px; color: var(--muted); text-align: right; }

@media (max-width: 900px) {
  .conn-row { grid-template-columns: 1fr 80px; gap: 6px; }
  .conn-row .src, .conn-row .since, .conn-row .chain { display: none; }
}

/* Stats grid */
.grid-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.stat-card { background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 18px; box-shadow: var(--shadow); }
.stat-label { font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }
.stat-value { font-size: 22px; font-weight: 600; margin-top: 4px; }
.stat-sub { font-size: 12px; color: var(--muted); margin-top: 2px; }

/* System grid */
.sys-grid { display: grid; grid-template-columns: 220px 1fr; gap: 8px 16px; padding: 16px 20px; font-size: 13px; }
.sys-grid .k { color: var(--muted); }
.sys-grid .v { color: var(--text); font-family: var(--mono); font-size: 12px; word-break: break-all; }

/* QR */
.qr-block { display: flex; flex-direction: column; align-items: center; gap: 10px; padding: 14px; background: var(--bg-elev2); border-radius: var(--radius-sm); border: 1px solid var(--border); margin-bottom: 14px; }
.qr-block img { width: 240px; height: 240px; image-rendering: pixelated; background: #fff; padding: 10px; border-radius: 6px; }
.qr-hint { font-size: 11px; color: var(--muted); text-align: center; }

@media (max-width: 900px) { .grid-stats { grid-template-columns: repeat(2, 1fr); } .sys-grid { grid-template-columns: 1fr; } .sys-grid .k { font-weight: 600; } }
@media (max-width: 600px) {
  .topbar { padding: 12px 16px; }
  .main { padding: 16px; }
  .card-head { padding: 14px 16px; }
  .user-row { padding: 12px 16px; grid-template-columns: 32px 1fr auto; }
  .title { font-size: 14px; }
}