:root {
  --bg: #edf3f9;
  --bg-strong: #dbe7f4;
  --sidebar: #11263e;
  --sidebar-soft: #1b3b5d;
  --panel: #ffffff;
  --panel-soft: #f6f9fc;
  --panel-tint: #f0f5fb;
  --line: #d5e0ec;
  --line-strong: #bfd0e2;
  --text: #18324f;
  --muted: #617994;
  --accent: #2277d8;
  --accent-soft: #e5f0ff;
  --success: #1ca56a;
  --warning: #d98a1f;
  --danger: #d85f5f;
  --terminal: #081426;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", Arial, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top right, rgba(34, 119, 216, 0.08), transparent 28%),
    linear-gradient(180deg, #f9fbfe 0%, var(--bg) 100%);
  overflow-x: hidden;
}

code {
  font-family: Consolas, "IBM Plex Mono", monospace;
  font-size: 0.95em;
}

.sidebar-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(7, 18, 32, 0.46);
  z-index: 20;
}

.layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  width: 100%;
  max-width: 100%;
  height: 100vh;
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding: 22px 16px;
  background:
    linear-gradient(180deg, rgba(120, 181, 255, 0.08), transparent 22%),
    linear-gradient(180deg, #132a43 0%, #102238 100%);
  color: #dce8f7;
  border-right: 1px solid rgba(255, 255, 255, 0.08);
  height: 100vh;
  overflow: visible;
  position: sticky;
  top: 0;
  z-index: 25;
}

.brand {
  display: flex;
  gap: 12px;
  align-items: center;
  padding: 6px 10px 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.brand-mark {
  width: 18px;
  height: 18px;
  border-radius: 6px;
  background: linear-gradient(180deg, #59b4ff, #2b7ddd);
  position: relative;
  flex: 0 0 auto;
}

.brand-mark::before,
.brand-mark::after {
  content: "";
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  border: 2px solid rgba(255, 255, 255, 0.92);
  border-bottom: 0;
  border-radius: 999px 999px 0 0;
}

.brand-mark::before {
  width: 12px;
  height: 7px;
  top: 4px;
}

.brand-mark::after {
  width: 7px;
  height: 4px;
  top: 7px;
}

.brand-copy {
  display: grid;
  gap: 4px;
}

.brand-kicker {
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #8fc3ff;
  font-weight: 700;
}

.brand-title {
  font-size: 20px;
  font-weight: 700;
  color: #fff;
}

.nav-title {
  padding: 0 10px;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: #86a9ce;
}

.nav {
  display: grid;
  gap: 6px;
}

.nav-group {
  position: relative;
}

.nav-item {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 13px 12px;
  border: 1px solid transparent;
  border-radius: 14px;
  background: transparent;
  color: #dce8f7;
  text-align: left;
  font: inherit;
  cursor: pointer;
  transition: background 160ms ease, border-color 160ms ease, transform 160ms ease;
}

.nav-item:hover {
  background: rgba(255, 255, 255, 0.04);
  transform: translateX(2px);
}

.nav-item.active {
  background: linear-gradient(180deg, rgba(69, 147, 242, 0.28), rgba(49, 108, 184, 0.18));
  border-color: rgba(144, 194, 255, 0.28);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.nav-group.open > .nav-item {
  background: linear-gradient(180deg, rgba(69, 147, 242, 0.28), rgba(49, 108, 184, 0.18));
  border-color: rgba(144, 194, 255, 0.28);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.nav-item span {
  display: grid;
  gap: 4px;
}

.nav-item strong {
  font-size: 14px;
  font-weight: 700;
  color: #fff;
}

.nav-item small {
  font-size: 12px;
  color: #a7c3df;
}

.nav-pill {
  padding: 5px 8px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  color: #dce8f7;
  font-size: 11px;
  white-space: nowrap;
}

.nav-arrow {
  min-width: 34px;
  text-align: center;
}

.nav-flyout {
  position: absolute;
  top: 0;
  left: calc(100% + 2px);
  min-width: 220px;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.98);
  box-shadow: 0 18px 40px rgba(12, 29, 51, 0.16);
  opacity: 0;
  visibility: hidden;
  transform: translateX(-8px);
  pointer-events: none;
  transition: opacity 160ms ease, transform 160ms ease, visibility 160ms ease;
  z-index: 40;
}

.nav-flyout::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: -14px;
  width: 14px;
}

.nav-group:hover > .nav-flyout,
.nav-group.open > .nav-flyout {
  opacity: 1;
  visibility: visible;
  transform: translateX(0);
  pointer-events: auto;
}

.nav-group.suppress-hover > .nav-flyout {
  opacity: 0;
  visibility: hidden;
  transform: translateX(-8px);
  pointer-events: none;
}

.flyout-item {
  width: 100%;
  padding: 12px 14px;
  border: 0;
  border-radius: 12px;
  background: transparent;
  color: var(--text);
  text-align: left;
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}

.flyout-item:hover {
  background: var(--panel-soft);
}

.flyout-item.active {
  background: var(--accent-soft);
  color: var(--accent);
}

.main {
  display: grid;
  grid-template-rows: auto 1fr;
  width: 100%;
  min-width: 0;
  height: 100vh;
  overflow-y: auto;
}

.sidebar-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  background: var(--panel-soft);
  color: var(--text);
  border-radius: 10px;
  padding: 8px 11px;
  font: inherit;
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 18px 24px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.topbar-copy {
  display: grid;
  gap: 6px;
  min-width: 0;
}

.page-eyebrow {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--accent);
  font-weight: 700;
}

.page-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--text);
}

.topbar-meta {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.lang-switch {
  display: inline-flex;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel-soft);
}

.lang-button {
  border: 0;
  background: transparent;
  color: var(--muted);
  padding: 6px 10px;
  border-radius: 999px;
  font: inherit;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
}

.lang-button.active {
  background: #fff;
  color: var(--text);
  box-shadow: 0 1px 3px rgba(19, 36, 58, 0.08);
}

.chip {
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--panel-soft);
  color: var(--muted);
  font-size: 12px;
}

.content {
  padding: 24px;
  min-width: 0;
  width: 100%;
  overflow-x: hidden;
}

.page-outlet {
  min-height: calc(100vh - 98px);
}

.page {
  display: none;
  gap: 18px;
  min-width: 0;
}

.page.active {
  display: grid;
}

.card,
.hero-card {
  border: 1px solid var(--line);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.96);
  min-width: 0;
}

.card {
  padding: 20px;
}

.card h2,
.hero-card h2 {
  margin: 0 0 10px;
  color: var(--text);
}

.card h2 {
  font-size: 18px;
}

.hero-card h2 {
  font-size: 28px;
  line-height: 1.2;
}

.card p,
.hero-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
  font-size: 14px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: 18px;
}

.hero-card {
  padding: 24px;
}

.hero-card-accent {
  background:
    radial-gradient(circle at top right, rgba(48, 130, 238, 0.18), transparent 30%),
    linear-gradient(180deg, #fff 0%, #f8fbff 100%);
}

.hero-label {
  display: inline-block;
  margin-bottom: 12px;
  padding: 6px 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 20px;
}

.hero-stat {
  padding: 14px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.84);
}

.hero-stat-value {
  display: block;
  font-size: 28px;
  font-weight: 700;
  color: var(--text);
}

.hero-stat-label {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  color: var(--muted);
}

.status-list {
  display: grid;
  gap: 12px;
}

.status-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px dashed var(--line);
}

.status-row:last-child {
  border-bottom: 0;
}

.status-row span {
  color: var(--muted);
}

.status-row strong {
  color: var(--text);
}

.split {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 18px;
  min-width: 0;
}

.split-wide {
  grid-template-columns: 1fr 1fr;
}

.channel-groups,
.settings-grid {
  display: grid;
  gap: 14px;
}

.channel-groups {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 16px;
}

.settings-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 16px;
}

.group-card,
.setting-box {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--panel-soft);
}

.group-title,
.setting-box h3 {
  margin: 0 0 6px;
  font-size: 15px;
  color: var(--text);
  font-weight: 700;
}

.group-meta,
.setting-box p {
  margin: 0;
  font-size: 13px;
  color: var(--muted);
  line-height: 1.5;
}

.diagram-card {
  position: relative;
  display: grid;
  gap: 18px;
  align-items: center;
  justify-items: center;
  min-height: 320px;
  margin-top: 16px;
  padding: 24px;
  border-radius: 18px;
  background:
    linear-gradient(180deg, rgba(236, 244, 252, 0.8), rgba(245, 249, 253, 0.96)),
    var(--panel-tint);
  border: 1px dashed var(--line-strong);
}

.diagram-node,
.diagram-device {
  padding: 12px 16px;
  border-radius: 14px;
  border: 1px solid var(--line-strong);
  background: #fff;
  font-weight: 700;
}

.diagram-node-center {
  min-width: 220px;
  text-align: center;
  border-color: #f3b469;
  box-shadow: 0 0 0 10px rgba(243, 180, 105, 0.14);
}

.diagram-stack {
  display: grid;
  gap: 12px;
  width: 100%;
  max-width: 220px;
}

.diagram-line {
  background: linear-gradient(180deg, #84b8ff, #f1af62);
}

.diagram-line-horizontal {
  width: 160px;
  height: 2px;
}

.diagram-line-vertical {
  width: 2px;
  height: 28px;
}

.port-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-top: 18px;
}

.port-tile {
  display: grid;
  gap: 8px;
  padding: 14px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: #fff;
  min-width: 0;
}

.port-up {
  background: linear-gradient(180deg, #fff 0%, #f6fbf8 100%);
}

.port-warn {
  background: linear-gradient(180deg, #fff 0%, #fff9f1 100%);
  border-color: #edd2a7;
}

.port-off {
  background: linear-gradient(180deg, #fff 0%, #f7f9fc 100%);
  opacity: 0.82;
}

.port-num {
  font-size: 12px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.08em;
}

.port-name {
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
}

.port-state {
  font-size: 12px;
  color: var(--muted);
}

.info-list {
  display: grid;
  gap: 12px;
  margin-top: 16px;
}

.info-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--line);
  font-size: 14px;
}

.info-row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.info-key {
  color: var(--muted);
}

.info-value {
  color: var(--text);
  font-weight: 600;
  text-align: right;
  word-break: break-word;
  min-width: 0;
}

.device-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 14px;
  font-size: 14px;
}

.device-table th,
.device-table td {
  padding: 12px 10px;
  border-bottom: 1px solid var(--line);
  text-align: left;
}

.device-table th {
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.terminal-shell {
  min-height: 620px;
  border: 1px solid #9db6d2;
  border-radius: 18px;
  overflow: hidden;
  background: var(--terminal);
  box-shadow: 0 12px 28px rgba(17, 35, 60, 0.08);
  min-width: 0;
}

.terminal-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 14px 18px;
  border-bottom: 1px solid rgba(197, 214, 235, 0.14);
  background: linear-gradient(180deg, #10213a 0%, #0c1a2e 100%);
}

.terminal-title {
  color: #e1eeff;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.terminal-note {
  color: #96b6d8;
  font-size: 12px;
}

#terminal {
  height: calc(100% - 53px);
  padding: 16px 14px 10px;
}

#terminal .xterm-viewport {
  scrollbar-width: none;
  -ms-overflow-style: none;
}

#terminal .xterm-viewport::-webkit-scrollbar {
  width: 0;
  height: 0;
}

.footer {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 12px;
  padding-top: 10px;
}

.status-live {
  color: var(--warning);
}

.status-ok {
  color: var(--success);
}

.status-bad {
  color: var(--danger);
}

@media (max-width: 1260px) {
  .hero-grid,
  .split,
  .split-wide {
    grid-template-columns: 1fr;
  }

  .port-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 920px) {
  .layout {
    display: block;
    height: auto;
  }

  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: min(320px, 82vw);
    transform: translateX(-100%);
    transition: transform 180ms ease;
    z-index: 30;
    height: 100vh;
    overflow-y: auto;
    overflow-x: hidden;
  }

  body.sidebar-open .sidebar {
    transform: translateX(0);
  }

  body.sidebar-open {
    overflow: hidden;
  }

  .sidebar-toggle {
    display: inline-flex;
  }

  .main {
    height: auto;
    overflow-y: visible;
  }

  .topbar {
    padding: 16px 18px;
  }

  .topbar-meta {
    width: 100%;
    justify-content: flex-start;
  }

  .content {
    padding: 18px;
  }

  .hero-card,
  .card {
    padding: 18px;
  }

  .nav-flyout {
    position: static;
    min-width: 0;
    margin-top: 6px;
    padding: 6px;
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(255, 255, 255, 0.08);
    box-shadow: none;
    opacity: 1;
    visibility: visible;
    transform: none;
    pointer-events: auto;
    display: none;
  }

  .nav-group.open > .nav-flyout {
    display: block;
  }

  .flyout-item {
    color: #dce8f7;
  }

  .flyout-item:hover {
    background: rgba(255, 255, 255, 0.08);
  }

  .flyout-item.active {
    background: rgba(143, 195, 255, 0.18);
    color: #ffffff;
  }

  .hero-stats,
  .channel-groups,
  .settings-grid,
  .port-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-title {
    font-size: 24px;
  }

  .terminal-shell {
    min-height: 58vh;
  }
}

@media (max-width: 640px) {
  .topbar {
    gap: 12px;
  }

  .page-title {
    font-size: 21px;
  }

  .hero-card h2 {
    font-size: 24px;
  }

  .hero-stats,
  .channel-groups,
  .settings-grid,
  .port-grid {
    grid-template-columns: 1fr;
  }

  .card,
  .hero-card,
  .group-card,
  .setting-box,
  .port-tile {
    padding: 14px;
  }

  .device-table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }

  .terminal-shell {
    min-height: 52vh;
  }
}