:root { color-scheme: light dark; }
* { box-sizing: border-box; }
body { font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif; margin: 0; background: var(--bg, #0f0f10); color: var(--fg, #eaeaea); }
.layout { display: grid; grid-template-columns: 320px 1fr; height: 100vh; }
.sidebar { background: #111317; border-right: 1px solid #23252b; padding: 12px; display: flex; flex-direction: column; gap: 12px; }
.brand { font-weight: 700; letter-spacing: .2px; }
.create { display: flex; gap: 8px; }
.create input { flex: 1; }
.chat-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 6px; overflow: auto; }
.chat-list li { display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 10px 12px; border-radius: 10px; background: #151820; border: 1px solid #1f2230; cursor: pointer; }
.chat-list li.active { outline: 2px solid #2f7bff; }
.chat { display: grid; grid-template-rows: 56px 1fr 64px; }
.chat-header { display: flex; align-items: center; justify-content: space-between; padding: 0 16px; border-bottom: 1px solid #23252b; }
.messages { padding: 16px; overflow: auto; display: flex; flex-direction: column; gap: 10px; }
.message { max-width: 70%; padding: 10px 12px; border-radius: 14px; background: #1b2130; border: 1px solid #263041; }
.message.me { align-self: flex-end; background: #1f2d4a; border-color: #2f3f63; }
.composer { display: grid; grid-template-columns: 1fr auto auto auto; gap: 8px; padding: 10px; border-top: 1px solid #23252b; }
button { padding: 8px 12px; border-radius: 10px; border: 1px solid #2a2e3a; background: #1a2030; color: #eaeaea; cursor: pointer; }
button:hover { background: #1f2640; }
input { padding: 10px 12px; border-radius: 10px; border: 1px solid #2a2e3a; background: #0f131c; color: #eaeaea; }