:root {
  color-scheme: light;
  --bg: #f6f7f9;
  --panel: #ffffff;
  --panel-muted: #f8fafc;
  --border: #e2e8f0;
  --ink: #0f172a;
  --muted: #64748b;
  --accent: #2563eb;
  --accent-soft: rgba(37, 99, 235, 0.12);
  --radius: 16px;
  --shadow: 0 12px 30px rgba(15, 23, 42, 0.08);
  font-family: "Geist", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
}

.app {
  min-height: 100vh;
  display: flex;
  background:
    radial-gradient(circle at 10% 10%, rgba(37, 99, 235, 0.08), transparent 50%),
    radial-gradient(circle at 80% 5%, rgba(14, 116, 144, 0.08), transparent 45%),
    var(--bg);
}

.sidebar {
  width: 260px;
  padding: 24px;
  background: var(--panel);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 24px;
}

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

.logo {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--accent);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 700;
  letter-spacing: 0.08em;
  font-size: 12px;
}

.brand-label {
  font-size: 14px;
  font-weight: 600;
  margin: 0;
}

.brand-sub {
  font-size: 12px;
  color: var(--muted);
  margin: 4px 0 0;
}

.nav {
  display: grid;
  gap: 8px;
}

.nav-item {
  border: 1px solid transparent;
  background: transparent;
  color: var(--muted);
  text-align: left;
  padding: 10px 12px;
  border-radius: 10px;
  font-weight: 600;
  cursor: pointer;
}

.nav-item.active {
  background: var(--accent-soft);
  color: var(--accent);
  border-color: rgba(37, 99, 235, 0.2);
}

.nav-item:disabled {
  cursor: default;
  opacity: 0.4;
}

.status {
  display: grid;
  gap: 12px;
  padding: 14px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--panel-muted);
  font-size: 12px;
}

.status-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
}

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

.status-row .value {
  font-family: "Geist Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

.main {
  flex: 1;
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

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

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 11px;
  color: var(--muted);
  margin: 0 0 10px;
}

h1 {
  margin: 0 0 6px;
  font-size: clamp(28px, 3vw, 40px);
}

.lede {
  margin: 0;
  color: var(--muted);
  max-width: 500px;
  font-size: 14px;
}

.controls {
  display: grid;
  gap: 12px;
  padding: 16px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--panel);
  min-width: 260px;
}

.control {
  display: grid;
  gap: 6px;
  font-size: 12px;
  color: var(--muted);
}

.control input {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 10px;
  font-family: "Geist Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12px;
}

.toggle {
  display: flex;
  gap: 8px;
  align-items: center;
  font-size: 12px;
  color: var(--muted);
}

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

.btn {
  border-radius: 999px;
  border: 1px solid var(--border);
  padding: 8px 14px;
  background: transparent;
  font-weight: 600;
  font-size: 12px;
  cursor: pointer;
  color: var(--ink);
}

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

.btn.ghost {
  color: var(--accent);
}

.btn.small {
  padding: 6px 12px;
  font-size: 11px;
}

.content {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(260px, 340px) minmax(0, 1fr);
  gap: 20px;
}

.list-panel,
.detail-panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
  display: flex;
  flex-direction: column;
  min-height: 480px;
}

.list-toolbar {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  margin-bottom: 12px;
}

.list-toolbar input {
  flex: 1;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 10px;
  font-size: 12px;
  background: var(--panel-muted);
}

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

.list {
  display: grid;
  gap: 8px;
  overflow: auto;
}

.list-item {
  border: 1px solid transparent;
  border-radius: 12px;
  padding: 12px;
  cursor: pointer;
  display: grid;
  gap: 6px;
  background: var(--panel-muted);
}

.list-item:hover {
  border-color: var(--border);
}

.list-item.selected {
  border-color: var(--accent);
  background: rgba(37, 99, 235, 0.08);
}

.list-item.unread .subject {
  font-weight: 700;
}

.list-row {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  align-items: baseline;
  font-size: 11px;
  color: var(--muted);
}

.subject {
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
}

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

.code-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 8px;
  border-radius: 999px;
  border: 1px solid rgba(37, 99, 235, 0.2);
  background: rgba(37, 99, 235, 0.08);
  color: var(--accent);
  font-size: 11px;
  font-family: "Geist Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

.error {
  margin-bottom: 12px;
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px solid #fecaca;
  background: #fef2f2;
  color: #991b1b;
  font-size: 12px;
}

.empty {
  margin-top: 20px;
  text-align: center;
  color: var(--muted);
  font-size: 12px;
}

.detail-empty {
  margin: auto;
  color: var(--muted);
  text-align: center;
  font-size: 14px;
}

.detail {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.detail-header {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-start;
  flex-wrap: wrap;
}

.detail-from {
  font-size: 12px;
  color: var(--muted);
  margin: 0 0 6px;
}

.detail-header h2 {
  margin: 0 0 6px;
  font-size: 20px;
}

.detail-meta {
  margin: 0;
  font-size: 12px;
  color: var(--muted);
}

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

.code-pill {
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(37, 99, 235, 0.1);
  color: var(--accent);
  font-family: "Geist Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12px;
  font-weight: 600;
}

.payloads {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.panel {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px;
  background: var(--panel-muted);
  display: grid;
  gap: 10px;
}

.panel-label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.panel-body {
  display: grid;
  gap: 8px;
}

.panel-empty {
  font-size: 12px;
  color: var(--muted);
}

.html-frame {
  width: 100%;
  min-height: 220px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fff;
}

.raw-box {
  margin: 0;
  padding: 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #fff;
  font-family: "Geist Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 11px;
  line-height: 1.5;
  max-height: 320px;
  overflow: auto;
  white-space: pre-wrap;
}

@media (max-width: 1024px) {
  .app {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
  }

  .status {
    width: 100%;
  }

  .main {
    padding: 20px;
  }

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

@media (max-width: 640px) {
  .topbar {
    flex-direction: column;
  }

  .controls {
    width: 100%;
  }
}