.nkpc-app {
  --nkpc-border: #d8dee8;
  --nkpc-bg: #f6f8fb;
  --nkpc-panel: #ffffff;
  --nkpc-text: #172033;
  --nkpc-muted: #687385;
  --nkpc-accent: #1f5eff;
  --nkpc-danger: #b42318;
  display: grid;
  grid-template-columns: minmax(260px, 360px) 1fr;
  gap: 16px;
  max-width: 1180px;
  margin: 24px auto;
  color: var(--nkpc-text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.nkpc-panel {
  background: var(--nkpc-panel);
  border: 1px solid var(--nkpc-border);
  border-radius: 18px;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.06);
}

.nkpc-sidebar {
  padding: 18px;
}

.nkpc-main {
  min-height: 680px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.nkpc-header-block h2,
.nkpc-room-head h3 {
  margin: 0 0 6px;
  line-height: 1.35;
}

.nkpc-header-block p,
.nkpc-room-head p,
.nkpc-note {
  margin: 0;
  color: var(--nkpc-muted);
  font-size: 13px;
  line-height: 1.6;
}

.nkpc-details {
  margin-top: 14px;
  border: 1px solid var(--nkpc-border);
  border-radius: 14px;
  padding: 10px 12px;
  background: #fbfcff;
}

.nkpc-details summary {
  cursor: pointer;
  font-weight: 700;
}

.nkpc-form {
  display: grid;
  gap: 10px;
  margin-top: 12px;
}

.nkpc-form label {
  display: grid;
  gap: 5px;
  font-size: 13px;
  font-weight: 700;
}

.nkpc-form input,
.nkpc-compose textarea,
.nkpc-compose input[type="file"] {
  width: 100%;
  box-sizing: border-box;
  border: 1px solid var(--nkpc-border);
  border-radius: 12px;
  padding: 10px 12px;
  font: inherit;
  background: #fff;
}

.nkpc-form button,
.nkpc-compose button,
.nkpc-download {
  appearance: none;
  border: 0;
  border-radius: 999px;
  background: var(--nkpc-accent);
  color: #fff;
  padding: 10px 16px;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  display: inline-flex;
  justify-content: center;
  align-items: center;
}

.nkpc-form button:hover,
.nkpc-compose button:hover,
.nkpc-download:hover {
  filter: brightness(0.95);
  color: #fff;
}

.nkpc-section-title {
  margin-top: 18px;
  margin-bottom: 8px;
  font-weight: 800;
}

.nkpc-room-list {
  display: grid;
  gap: 8px;
}

.nkpc-room-item {
  width: 100%;
  text-align: left;
  background: #fff;
  border: 1px solid var(--nkpc-border);
  border-radius: 14px;
  padding: 12px;
  cursor: pointer;
}

.nkpc-room-item.is-active {
  border-color: var(--nkpc-accent);
  box-shadow: inset 4px 0 0 var(--nkpc-accent);
}

.nkpc-room-title,
.nkpc-room-meta {
  display: block;
}

.nkpc-room-title {
  font-weight: 800;
}

.nkpc-room-meta {
  margin-top: 4px;
  color: var(--nkpc-muted);
  font-size: 12px;
}

.nkpc-room-head {
  padding: 18px 20px;
  border-bottom: 1px solid var(--nkpc-border);
  background: #fbfcff;
}

.nkpc-messages {
  flex: 1;
  overflow-y: auto;
  padding: 18px;
  background: var(--nkpc-bg);
}

.nkpc-message {
  max-width: 76%;
  margin: 0 0 12px;
  padding: 12px 14px;
  background: #fff;
  border: 1px solid var(--nkpc-border);
  border-radius: 16px 16px 16px 4px;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.nkpc-message.is-me {
  margin-left: auto;
  border-radius: 16px 16px 4px 16px;
  background: #eef4ff;
}

.nkpc-message-meta {
  color: var(--nkpc-muted);
  font-size: 12px;
  margin-bottom: 6px;
}

.nkpc-message-body {
  line-height: 1.65;
}

.nkpc-attachment {
  margin-top: 10px;
  border: 1px solid var(--nkpc-border);
  border-radius: 12px;
  padding: 10px;
  background: #fff;
}

.nkpc-attachment.is-dangerous {
  border-color: #f3b4ad;
  background: #fff7f6;
}

.nkpc-attachment-name {
  font-weight: 800;
}

.nkpc-attachment-meta,
.nkpc-warning {
  color: var(--nkpc-muted);
  font-size: 12px;
  margin-top: 4px;
}

.nkpc-warning {
  color: var(--nkpc-danger);
  font-weight: 700;
}

.nkpc-download {
  margin-top: 8px;
  font-size: 13px;
  padding: 8px 12px;
}

.nkpc-compose {
  border-top: 1px solid var(--nkpc-border);
  padding: 14px;
  display: grid;
  gap: 10px;
  background: #fff;
}

.nkpc-compose[hidden] {
  display: none;
}

.nkpc-compose-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  align-items: center;
}

.nkpc-empty,
.nkpc-empty-small,
.nkpc-login-required {
  padding: 16px;
  color: var(--nkpc-muted);
  background: #fff;
  border: 1px dashed var(--nkpc-border);
  border-radius: 14px;
}

.nkpc-toast {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 99999;
  background: #172033;
  color: #fff;
  padding: 12px 16px;
  border-radius: 12px;
  box-shadow: 0 14px 40px rgba(0,0,0,.2);
}

@media (max-width: 860px) {
  .nkpc-app {
    grid-template-columns: 1fr;
    margin: 12px;
  }
  .nkpc-main {
    min-height: 620px;
  }
  .nkpc-message {
    max-width: 92%;
  }
  .nkpc-compose-row {
    grid-template-columns: 1fr;
  }
}

.nkpc-create-locked,
.nkpc-selected-room {
  margin-top: 14px;
  padding: 12px;
  border: 1px solid var(--nkpc-border);
  border-radius: 14px;
  background: #fbfcff;
  color: var(--nkpc-muted);
  font-size: 13px;
  line-height: 1.6;
}

.nkpc-selected-room {
  margin-top: 0;
  font-weight: 700;
  color: var(--nkpc-text);
  background: #fff;
}

.nkpc-room-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
}

.nkpc-room-actions {
  flex: 0 0 auto;
}

.nkpc-close-room {
  appearance: none;
  border: 1px solid #f3b4ad;
  border-radius: 999px;
  background: #fff7f6;
  color: var(--nkpc-danger);
  padding: 9px 14px;
  font-weight: 800;
  cursor: pointer;
}

.nkpc-close-room:hover {
  filter: brightness(0.97);
}

@media (max-width: 860px) {
  .nkpc-room-head {
    align-items: flex-start;
    flex-direction: column;
  }
}