:root {
  --primary: #167aff;
  --primary-dark: #095ed1;
  --ink: #1f2937;
  --muted: #667085;
  --line: #d9e2ef;
  --panel: #ffffff;
  --surface: #f4f7fb;
  --soft: #eaf3ff;
  --danger: #b42318;
  font-family:
    Inter, "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  color: var(--ink);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--surface);
  font-size: 14px;
}

.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  padding: 24px 32px;
  color: #ffffff;
  background: var(--primary);
  border-bottom: 1px solid rgba(255, 255, 255, 0.24);
}

.eyebrow {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0;
  opacity: 0.82;
}

h1,
h2 {
  margin: 0;
  letter-spacing: 0;
}

h1 {
  font-size: 24px;
  font-weight: 650;
}

h2 {
  font-size: 18px;
  font-weight: 650;
}

.status-pill {
  flex: 0 0 auto;
  padding: 8px 12px;
  border: 1px solid rgba(255, 255, 255, 0.36);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.14);
  font-size: 13px;
}

.layout {
  display: grid;
  grid-template-columns: 208px minmax(0, 1fr);
  gap: 20px;
  padding: 20px;
}

.sidebar {
  align-self: start;
  display: grid;
  gap: 8px;
  padding: 12px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.nav-item,
button {
  font: inherit;
}

.nav-item {
  width: 100%;
  min-height: 38px;
  padding: 0 12px;
  color: var(--ink);
  text-align: left;
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  cursor: pointer;
}

.nav-item:hover {
  color: var(--primary);
  background: var(--soft);
}

.nav-item.active {
  color: var(--primary);
  background: var(--soft);
  border-color: #c8ddff;
  font-weight: 650;
}

.content {
  min-width: 0;
}

.panel {
  display: none;
  padding: 20px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.panel.active {
  display: block;
}

.panel-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.panel-head p {
  margin: 8px 0 0;
  color: var(--muted);
  line-height: 1.6;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}

.primary-btn,
.secondary-btn {
  min-height: 36px;
  padding: 0 14px;
  border-radius: 6px;
  cursor: pointer;
  white-space: nowrap;
}

.primary-btn {
  color: #ffffff;
  border: 1px solid var(--primary);
  background: var(--primary);
}

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

.secondary-btn {
  color: var(--primary);
  border: 1px solid #b8d5ff;
  background: #ffffff;
}

.secondary-btn:hover {
  background: var(--soft);
}

.grid {
  display: grid;
  gap: 16px;
  padding-top: 18px;
}

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

.field {
  display: grid;
  gap: 8px;
  min-width: 0;
}

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

.field span {
  color: #344054;
  font-weight: 650;
  font-size: 13px;
}

textarea {
  width: 100%;
  min-height: 108px;
  resize: vertical;
  padding: 10px 12px;
  color: #101828;
  background: #fbfdff;
  border: 1px solid #cfd8e6;
  border-radius: 6px;
  font: 13px/1.5 "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  outline: none;
}

textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(22, 122, 255, 0.12);
}

textarea[readonly] {
  background: #f8fafc;
}

.toast {
  position: fixed;
  right: 20px;
  bottom: 20px;
  max-width: min(460px, calc(100vw - 40px));
  padding: 12px 14px;
  color: #ffffff;
  background: #1f2937;
  border-radius: 8px;
  box-shadow: 0 14px 32px rgba(15, 23, 42, 0.22);
  opacity: 0;
  transform: translateY(8px);
  pointer-events: none;
  transition:
    opacity 180ms ease,
    transform 180ms ease;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

.toast.error {
  background: var(--danger);
}

@media (max-width: 860px) {
  .app-header {
    align-items: flex-start;
    flex-direction: column;
    padding: 20px;
  }

  .layout {
    grid-template-columns: 1fr;
    padding: 14px;
  }

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

  .panel-head {
    flex-direction: column;
  }

  .actions {
    justify-content: flex-start;
  }

  .grid.two {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 520px) {
  h1 {
    font-size: 21px;
  }

  .sidebar {
    grid-template-columns: 1fr;
  }

  .panel {
    padding: 16px;
  }
}