body {
  font-family: Arial, sans-serif;
  background: #f4f4f4;
  margin: 0;
  padding: 0;
}
.layout {
  display: flex;
  min-height: 100vh;
}
.sidebar {
  width: 240px;
  background: #e0e0e0; /* Changed from #222e3c to a light grey */
  color: #222e3c;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  padding: 32px 0 0 0;
  box-shadow: 2px 0 8px rgba(0,0,0,0.04);
}
.sidebar h2 {
  color: #222e3c;
  text-align: center;
  margin-bottom: 32px;
  font-size: 1.5em;
  letter-spacing: 1px;
}
.sidebar nav ul {
  list-style: none;
  padding: 0;
  margin: 0 0 24px 0;
}
.sidebar nav li {
  margin: 0 0 8px 0;
}
.sidebar-btn {
  width: 100%;
  background: none;
  border: none;
  color: #222e3c;
  padding: 14px 0;
  font-size: 1.1em;
  text-align: left;
  padding-left: 32px;
  cursor: pointer;
  transition: background 0.2s;
}
.sidebar-btn.active, .sidebar-btn:hover {
  background: #cccccc;
}
.compose-btn, .logout-btn {
  margin: 12px 24px 0 24px;
  padding: 12px 0;
  border-radius: 4px;
  border: none;
  font-size: 1em;
  font-weight: bold;
  cursor: pointer;
}
.compose-btn {
  background: #0077cc;
  color: #fff;
}
.compose-btn:hover {
  background: #005fa3;
}
.logout-btn {
  background: #fff;
  color: #222e3c;
  border: 1px solid #eee;
  margin-bottom: 24px;
}
.logout-btn:hover {
  background: #f4f4f4;
}
.main-content {
  flex: 1;
  background: #fff;
  padding: 40px 32px;
  display: flex;
  gap: 32px;
}
#email-list {
  width: 340px;
  border-right: 1px solid #eee;
  padding-right: 24px;
  overflow-y: auto;
  max-height: 70vh;
}
.email-list-section {
  margin-bottom: 32px;
}
.email-list-title {
  font-size: 1.1em;
  color: #0077cc;
  margin-bottom: 8px;
}
.email-list-item {
  padding: 12px 10px;
  border-radius: 4px;
  margin-bottom: 6px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background 0.15s, border 0.15s;
}
.email-list-item.selected, .email-list-item:hover {
  background: #f0f6fa;
  border: 1px solid #0077cc;
}
.email-list-item .subject {
  font-weight: bold;
  color: #222e3c;
}
.email-list-item .fromto {
  font-size: 0.95em;
  color: #555;
}
.email-detail {
  flex: 1;
  min-width: 0;
  padding-left: 24px;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
}
.email-detail-content {
  background: #f8fafc;
  border-radius: 8px;
  padding: 24px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}
.email-detail-header {
  margin-bottom: 16px;
}
.email-detail-header strong {
  color: #0077cc;
}
.email-detail-body {
  margin-top: 16px;
  white-space: pre-wrap;
  color: #222e3c;
}
.error {
  color: #d8000c;
  text-align: center;
}
/* Modal overlay for compose */
.modal-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}
.modal-content {
  background: #fff;
  padding: 32px 32px 24px 32px;
  border-radius: 10px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.18);
  min-width: 340px;
  max-width: 95vw;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
}
#composeForm input, #composeForm textarea, #composeForm button {
  width: 100%;
  margin: 8px 0;
  padding: 10px;
  border: 1px solid #ccc;
  border-radius: 4px;
  box-sizing: border-box;
}
#composeForm button[type="submit"] {
  background: #0077cc;
  color: #fff;
  border: none;
  font-weight: bold;
  margin-bottom: 0;
}
#composeForm button[type="submit"]:hover {
  background: #005fa3;
}
#composeForm button[type="button"] {
  background: #eee;
  color: #222e3c;
  border: none;
  margin-top: 0;
}
#composeForm button[type="button"]:hover {
  background: #ddd;
}
@media (max-width: 900px) {
  .main-content {
    flex-direction: column;
    padding: 24px 8px;
  }
  #email-list {
    width: 100%;
    max-height: 200px;
    border-right: none;
    border-bottom: 1px solid #eee;
    padding-right: 0;
    padding-bottom: 16px;
  }
  .email-detail {
    padding-left: 0;
  }
}