:root {
  --bg: #f4f6f8;
  --surface: #ffffff;
  --surface-soft: #f8fafc;
  --ink: #17202a;
  --muted: #64748b;
  --border: #d8dee8;
  --accent: #126b80;
  --accent-soft: #e3f3f6;
  --warn: #a85b16;
  --warn-soft: #fff2df;
  --success: #14704f;
  --success-soft: #e5f6ef;
  --danger: #b42318;
  --radius: 8px;
  --shadow: 0 8px 24px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, "Avenir Next", "Segoe UI", sans-serif;
}

a {
  color: inherit;
  text-decoration: none;
}

.app-shell {
  display: grid;
  grid-template-columns: 248px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  background: #0f2632;
  color: #f8fafc;
  padding: 24px 18px;
}

.brand {
  margin-bottom: 24px;
}

.brand p,
.muted,
.user-panel span {
  color: var(--muted);
}

.sidebar .brand p,
.sidebar .user-panel span {
  color: #aebfcc;
}

.brand h1,
.page-header h2,
.panel h3,
.panel h4 {
  margin: 0;
}

.brand h1 {
  font-size: 1.55rem;
}

.main {
  padding: 24px;
  min-width: 0;
}

.user-panel {
  display: grid;
  gap: 8px;
  padding: 14px;
  margin-bottom: 18px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.06);
}

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

.nav-link {
  display: block;
  padding: 11px 12px;
  border-radius: var(--radius);
  color: #dbe7ee;
}

.nav-link:hover,
.nav-link.active {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
}

.page-header,
.panel-header,
.row-top,
.detail-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
}

.page-header {
  margin-bottom: 18px;
}

.toolbar {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}

button,
.btn,
input[type="submit"] {
  border: 0;
  border-radius: 7px;
  background: var(--accent);
  color: white;
  padding: 9px 13px;
  font: inherit;
  font-weight: 650;
  cursor: pointer;
}

button.secondary,
.btn.secondary {
  background: #e8edf2;
  color: var(--ink);
}

.grid {
  display: grid;
  gap: 16px;
  margin-bottom: 16px;
}

.grid.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid.four {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.panel,
.metric-tile,
.login-card,
.empty-state {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.panel {
  padding: 16px;
  margin-bottom: 16px;
}

.metric-tile {
  padding: 16px;
}

.metric-tile span {
  display: block;
  color: var(--muted);
  font-size: 0.86rem;
}

.metric-tile strong {
  display: block;
  margin-top: 6px;
  font-size: 2rem;
}

.queue-list,
.stack-list,
.message-list {
  display: grid;
  gap: 9px;
}

.queue-row,
.stack-item,
.conversation-row {
  display: block;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 11px 12px;
}

.queue-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px;
  align-items: center;
}

.queue-row small {
  grid-column: 1 / -1;
  color: var(--muted);
}

.queue-row:hover,
.queue-row.active,
.conversation-row:hover,
.conversation-row.active {
  border-color: #85bfca;
  background: var(--accent-soft);
}

.queue-section {
  margin: 14px 4px 6px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.inbox-shell {
  display: grid;
  grid-template-columns: 250px 360px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
}

.queue-pane,
.conversation-pane,
.detail-pane {
  min-width: 0;
}

.conversation-pane {
  display: grid;
  gap: 9px;
}

.conversation-row p {
  margin: 7px 0;
  color: var(--ink);
}

.row-meta {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  color: var(--muted);
  font-size: 0.82rem;
}

.channel-badge,
.badge {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 4px 9px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 750;
}

.badge.warn {
  background: var(--warn-soft);
  color: var(--warn);
}

.badge.success {
  background: var(--success-soft);
  color: var(--success);
}

.detail-pane {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
}

.detail-header {
  margin-bottom: 14px;
}

.detail-grid {
  display: grid;
  gap: 12px;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin: 10px 0;
}

.summary-grid div {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 9px;
  background: var(--surface-soft);
}

.summary-grid strong,
.summary-grid span {
  display: block;
}

.summary-grid strong {
  color: var(--muted);
  font-size: 0.78rem;
  margin-bottom: 4px;
}

.summary-list {
  margin: 8px 0 0;
  padding-left: 18px;
}

.message {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
  background: var(--surface-soft);
}

.message.outbound {
  background: #eef8f5;
  border-color: #b9dfd2;
}

pre {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.88rem;
  line-height: 1.48;
  margin: 9px 0 0;
}

form {
  display: grid;
  gap: 10px;
}

label {
  display: grid;
  gap: 6px;
  color: var(--muted);
}

input,
textarea,
select {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px;
  font: inherit;
  color: var(--ink);
  background: white;
}

.login-body {
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: #0f2632;
}

.login-card {
  width: min(420px, calc(100vw - 32px));
  padding: 28px;
}

.login-card h1 {
  margin-top: 0;
}

.alert {
  color: var(--danger);
  background: #fff1f0;
  border: 1px solid #ffd1cc;
  border-radius: var(--radius);
  padding: 10px;
}

.empty-state {
  padding: 18px;
}

@media (max-width: 1180px) {
  .inbox-shell {
    grid-template-columns: 220px minmax(0, 1fr);
  }

  .detail-pane {
    grid-column: 1 / -1;
  }
}

@media (max-width: 820px) {
  .app-shell,
  .inbox-shell,
  .grid.two,
  .grid.four {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
  }
}