:root {
  color-scheme: dark;
  --bg: #07111f;
  --panel: rgba(9, 20, 38, 0.88);
  --panel-strong: rgba(12, 28, 52, 0.96);
  --line: rgba(154, 180, 220, 0.18);
  --text: #eef4ff;
  --muted: #94a6c4;
  --accent: #6ee7ff;
  --accent-strong: #3ba9ff;
  --warning: #ffcf66;
  --danger: #ff8e8e;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.36);
  font-family: Inter, "Segoe UI", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(59, 169, 255, 0.2), transparent 24%),
    radial-gradient(circle at bottom right, rgba(110, 231, 255, 0.12), transparent 28%),
    linear-gradient(180deg, #06101d 0%, #09172c 100%);
}

button,
input {
  font: inherit;
}

.app-shell {
  display: grid;
  grid-template-columns: 360px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar,
.content {
  padding: 24px;
}

.sidebar {
  border-right: 1px solid var(--line);
  background: rgba(7, 17, 31, 0.72);
  backdrop-filter: blur(18px);
}

.sidebar-header h1,
.panel h2,
.mail-card h3 {
  margin: 0;
}

.sidebar-copy,
.muted,
.label,
.user-address,
.user-meta,
.user-empty,
.sidebar-status,
.status,
.empty-block p {
  color: var(--muted);
}

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

.sidebar-title-row button {
  padding: 9px 12px;
  white-space: nowrap;
}

.sidebar-status {
  margin: 12px 0 0;
  font-size: 13px;
}

.sidebar-status.loading {
  color: var(--accent);
}

.sidebar-status.success {
  color: #9fe8b2;
}

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

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 12px;
}

.search-box {
  display: grid;
  gap: 8px;
  margin: 24px 0 16px;
}

.search-box input,
button {
  border: 1px solid var(--line);
  border-radius: 14px;
  color: var(--text);
  background: rgba(15, 28, 51, 0.8);
}

.search-box input {
  padding: 12px 14px;
}

button {
  cursor: pointer;
  padding: 11px 14px;
  transition: border-color 120ms ease, transform 120ms ease, background 120ms ease;
}

button:hover:not(:disabled) {
  border-color: rgba(110, 231, 255, 0.5);
  background: rgba(18, 38, 68, 0.92);
}

button:disabled {
  cursor: wait;
  opacity: 0.7;
}

.list-meta,
.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.user-list {
  display: grid;
  gap: 10px;
  margin-top: 14px;
  max-height: calc(100vh - 245px);
  overflow: auto;
  padding-right: 4px;
}

.user-item,
.panel,
.mail-card {
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.user-item {
  width: 100%;
  padding: 14px;
  text-align: left;
  display: grid;
  gap: 6px;
}

.user-item.active {
  border-color: rgba(110, 231, 255, 0.55);
  background: linear-gradient(180deg, rgba(19, 39, 71, 0.96), rgba(11, 24, 45, 0.96));
}

.user-name {
  font-weight: 700;
}

.user-address,
.user-meta,
.label {
  font-size: 13px;
}

.content {
  display: flex;
}

.panel {
  width: 100%;
  padding: 28px;
  background: var(--panel-strong);
}

.panel-intro {
  display: grid;
  place-content: center;
  min-height: calc(100vh - 48px);
}

.status {
  margin: 20px 0;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
}

.status.loading {
  color: var(--accent);
}

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

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

.mail-card {
  margin-top: 20px;
  padding: 22px;
}

.mail-summary {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-bottom: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.mail-summary p,
.preview-block pre,
.empty-block h3,
.empty-block p {
  margin: 6px 0 0;
}

.preview-block {
  margin-top: 0;
}

.preview-block pre {
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.6;
  color: #dce7ff;
}

.mail-body-frame {
  width: 100%;
  min-height: 720px;
  margin-top: 12px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #ffffff;
}

.mono {
  font-family: "SFMono-Regular", Consolas, monospace;
}

.empty-block {
  margin-top: 20px;
  padding: 24px;
  border: 1px dashed var(--line);
  border-radius: 18px;
}

.hidden {
  display: none;
}

a {
  color: var(--accent);
}

@media (max-width: 980px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .user-list {
    max-height: 320px;
  }

  .panel-intro {
    min-height: auto;
  }
}

@media (max-width: 720px) {
  .sidebar,
  .content {
    padding: 16px;
  }

  .panel {
    padding: 20px;
  }

  .mail-summary {
    grid-template-columns: 1fr;
  }

  .panel-header,
  .list-meta {
    align-items: flex-start;
    flex-direction: column;
  }

  .sidebar-title-row {
    align-items: flex-start;
    flex-direction: column;
  }
}