body {
  margin: 0;
  font-family: "Inter", sans-serif;
  background: #0d0f12;
  color: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.app-container {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
}

.card {
  background: #1b1e24;
  padding: 20px;
  border-radius: 20px;
  width: 420px;
  height: 560px;
  display: flex;
  flex-direction: column;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.6);
}

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

.logo {
  height: 26px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

#selectedCount {
  font-size: 12px;
  color: #aaa;
}

.select-btn {
  background: transparent;
  border: 1px solid #444;
  padding: 4px 8px;
  border-radius: 8px;
  color: #fff;
  cursor: pointer;
  font-size: 12px;
  transition: 0.3s;
}
.select-btn:hover {
  background: #2c313a;
}

.icon-btn {
  background: transparent;
  border: none;
  font-size: 20px;
  cursor: pointer;
  color: #e53935;
  opacity: 0.4;
  transition: 0.3s;
}
.icon-btn:enabled {
  opacity: 1;
}
.icon-btn:hover:enabled {
  color: #ff4444;
}

.mail-list {
  list-style: none;
  padding: 0;
  margin: 0;
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.mail-list li {
  background: #23272f;
  padding: 14px 16px;
  border-radius: 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: 0.25s;
  cursor: pointer;
}
.mail-list li:hover {
  background: #2c313a;
}
.mail-list li.selected {
  transform: scale(1.02);
  box-shadow: 0 0 12px rgba(30, 136, 229, 0.4);
}

.item-text {
  max-width: 80%;
}
.item-text strong {
  font-size: 14px;
  display: block;
}
.item-text p {
  font-size: 12px;
  color: #aaa;
  margin: 4px 0 0;
  line-height: 1.4;
}

.mail-list input[type="checkbox"] {
  transform: scale(1.2);
  accent-color: #1e88e5;
  cursor: pointer;
}

.footer {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}

#newHeader,
#newSubtext {
  flex: 1;
  padding: 8px 10px;
  border-radius: 8px;
  border: none;
  background: #2c313a;
  color: #fff;
  outline: none;
  font-size: 13px;
}
#newHeader::placeholder,
#newSubtext::placeholder {
  color: #aaa;
}

.add-btn {
  background: #1e88e5;
  border: none;
  padding: 8px 12px;
  border-radius: 10px;
  color: #fff;
  font-size: 14px;
  cursor: pointer;
  transition: 0.3s;
}
.add-btn:hover {
  background: #1565c0;
}

/* Overlay */
.overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(229, 57, 53, 0.95);
  display: flex;
  justify-content: center;
  align-items: center;
  transform: scale(0);
  transition: transform 0.5s cubic-bezier(0.68, -0.55, 0.27, 1.55);
  z-index: 1000;
}

.overlay.active {
  transform: scale(1);
}

.overlay-content {
  text-align: center;
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.5s ease;
  max-width: 400px;
  padding: 20px;
}

.overlay.active .overlay-content {
  opacity: 1;
  transform: translateY(0);
}

.overlay-content h2 {
  font-size: 28px;
  margin-bottom: 10px;
  font-weight: bold;
}

.overlay-content p {
  font-size: 16px;
  margin-bottom: 20px;
}

.actions {
  display: flex;
  justify-content: center;
  gap: 15px;
}

.confirm-delete-btn {
  background: #fff;
  color: #c62828;
  border: none;
  padding: 10px 20px;
  border-radius: 12px;
  cursor: pointer;
  font-weight: bold;
  transition: 0.3s;
}
.confirm-delete-btn:hover {
  background: #f5f5f5;
}

.cancel-btn {
  background: transparent;
  border: 2px solid #fff;
  color: #fff;
  padding: 10px 20px;
  border-radius: 12px;
  cursor: pointer;
  font-weight: bold;
  transition: 0.3s;
}
.cancel-btn:hover {
  background: rgba(255, 255, 255, 0.2);
}