:root {
  color-scheme: light;
  --bg: #f6f7f9;
  --panel: #ffffff;
  --panel-soft: #f0f4f8;
  --text: #17202a;
  --muted: #607080;
  --line: #d9e0e7;
  --accent: #0f766e;
  --accent-dark: #0b5f59;
  --danger: #b42318;
  --warning: #b7791f;
  --ok: #16803c;
  --shadow: 0 16px 40px rgba(17, 24, 39, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
input,
textarea,
select {
  font: inherit;
}

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 260px 1fr;
}

.sidebar {
  background: #111827;
  color: #eef2f7;
  padding: 24px 18px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 28px;
}

.brand-mark {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: #0f766e;
  color: white;
  font-weight: 800;
}

.brand-title {
  font-weight: 800;
  line-height: 1.2;
}

.brand-subtitle {
  color: #a8b3c2;
  font-size: 13px;
}

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

.nav-item {
  border: 0;
  background: transparent;
  color: #cbd5e1;
  text-align: left;
  padding: 11px 12px;
  border-radius: 8px;
  cursor: pointer;
}

.nav-item:hover,
.nav-item.active {
  background: #1f2937;
  color: #ffffff;
}

.main {
  min-width: 0;
  padding: 28px;
}

.topbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 22px;
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: 28px;
  letter-spacing: 0;
}

h2 {
  font-size: 18px;
  letter-spacing: 0;
}

.topbar p,
.panel-head p,
.stat small {
  color: var(--muted);
}

.actions {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
}

input,
textarea,
select {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--text);
  padding: 10px 12px;
  min-height: 42px;
  outline: none;
}

textarea {
  resize: vertical;
}

input:focus,
textarea:focus,
select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.14);
}

button {
  min-height: 42px;
  border-radius: 8px;
  padding: 0 14px;
  border: 1px solid transparent;
  cursor: pointer;
  font-weight: 700;
}

.primary {
  background: var(--accent);
  color: #fff;
}

.primary:hover {
  background: var(--accent-dark);
}

.ghost {
  border-color: var(--line);
  background: #fff;
  color: var(--text);
}

.view {
  display: none;
}

.view.active {
  display: block;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 16px;
}

.stat,
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.stat {
  padding: 18px;
  display: grid;
  gap: 8px;
}

.stat span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
}

.stat strong {
  font-size: 32px;
  line-height: 1;
}

.content-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(320px, 0.8fr);
  gap: 16px;
}

.panel {
  padding: 18px;
}

.panel-head {
  display: grid;
  gap: 6px;
  margin-bottom: 16px;
}

.panel-head.inline {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.setup-grid {
  display: grid;
  gap: 14px;
}

.copy-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
}

label {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.wide {
  grid-column: 1 / -1;
}

.flow-list {
  margin: 0;
  padding-left: 22px;
  color: #334155;
  line-height: 1.8;
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 720px;
}

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

th {
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
}

td {
  color: #263341;
}

.status {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 0 9px;
  border-radius: 999px;
  background: var(--panel-soft);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

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

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

.status.queued,
.status.claimed {
  color: var(--warning);
}

#toast {
  position: fixed;
  right: 20px;
  bottom: 20px;
  max-width: 380px;
  background: #111827;
  color: white;
  padding: 12px 14px;
  border-radius: 8px;
  box-shadow: var(--shadow);
  transform: translateY(140%);
  transition: transform 180ms ease;
}

#toast.visible {
  transform: translateY(0);
}

@media (max-width: 900px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: sticky;
    top: 0;
    z-index: 5;
    padding: 14px;
  }

  .brand {
    margin-bottom: 12px;
  }

  .nav {
    display: flex;
    overflow-x: auto;
  }

  .nav-item {
    white-space: nowrap;
  }

  .main {
    padding: 18px;
  }

  .topbar,
  .panel-head.inline {
    display: grid;
  }

  .actions {
    justify-content: stretch;
  }

  .actions input,
  .actions button {
    width: 100%;
  }

  .stats-grid,
  .content-grid,
  .form-grid,
  .copy-row {
    grid-template-columns: 1fr;
  }
}