:root {
  color-scheme: dark;
  --bg: #0f0f0f;
  --panel: #171717;
  --panel-2: #202123;
  --border: #2f2f2f;
  --text: #ececec;
  --muted: #a0a0a0;
  --accent: #10a37f;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, "Segoe UI", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 280px 1fr;
}

.sidebar {
  background: var(--panel);
  border-right: 1px solid var(--border);
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.sidebar h1,
.sidebar h2 {
  margin: 0;
  font-size: 1rem;
}

.sidebar-btn,
button,
input,
textarea,
select {
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  border-radius: 0.5rem;
  font: inherit;
}

.sidebar-btn,
button {
  padding: 0.6rem 0.8rem;
  cursor: pointer;
}

button:hover,
.sidebar-btn:hover {
  border-color: var(--accent);
}

#search-input,
#chat-title,
textarea,
select {
  width: 100%;
  padding: 0.55rem 0.7rem;
}

.chat-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  overflow-y: auto;
}

.chat-item {
  text-align: left;
  width: 100%;
}

.chat-list-item {
  position: relative;
}

.chat-delete-btn {
  position: absolute;
  top: 50%;
  right: 0.4rem;
  transform: translateY(-50%);
  border: 0;
  background: transparent;
  border-radius: 0.4rem;
  padding: 0.2rem;
  line-height: 1;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.14s ease;
}

.chat-list-item:hover .chat-delete-btn,
.chat-list-item:focus-within .chat-delete-btn {
  opacity: 1;
  pointer-events: auto;
}

.chat-delete-btn:hover,
.chat-delete-btn:focus-visible {
  background: #333;
}

.chat-item.active {
  border-color: var(--accent);
}

.chat-view {
  display: grid;
  grid-template-rows: auto 1fr auto;
  min-height: 100vh;
}

.chat-header {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
}

.chat-header p {
  margin: 0.7rem 0 0;
  color: var(--muted);
  max-width: 70ch;
  line-height: 1.45;
}

#chat-title {
  font-size: 1.1rem;
  font-weight: 650;
}

.message-list {
  padding: 1.2rem;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  overflow-y: auto;
}

.message {
  max-width: 75ch;
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 0.8rem;
  background: var(--panel-2);
}

.message.you {
  align-self: flex-end;
  border-color: #3864d8;
}

.message.mirror {
  align-self: flex-start;
  border-color: var(--accent);
}

.message .speaker {
  color: var(--muted);
}

.message .content {
  margin: 0.45rem 0 0;
  white-space: pre-wrap;
}

.composer {
  border-top: 1px solid var(--border);
  padding: 1rem 1.25rem;
  display: grid;
  grid-template-columns: 160px 1fr auto;
  gap: 0.7rem;
  align-items: end;
}

.composer label {
  font-size: 0.85rem;
  color: var(--muted);
  display: block;
}

.composer label.grow {
  align-self: stretch;
}

.composer textarea {
  margin-top: 0.4rem;
  resize: vertical;
}

.empty-state {
  color: var(--muted);
  border: 1px dashed var(--border);
  border-radius: 0.75rem;
  padding: 1rem;
}

@media (max-width: 860px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

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

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