* { box-sizing: border-box; }
body { margin: 0; font-family: -apple-system, Segoe UI, Roboto, sans-serif; background: #f0f2f5; }

.login-body { height: 100vh; display: flex; align-items: center; justify-content: center; }
.login-card { background: #fff; padding: 32px; border-radius: 8px; width: 320px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); display: flex; flex-direction: column; gap: 8px; }
.login-card h1 { font-size: 18px; margin-bottom: 12px; text-align: center; }
.login-card input { padding: 8px; border: 1px solid #ccc; border-radius: 4px; }
.login-card button { margin-top: 12px; padding: 10px; background: #25d366; color: #fff; border: none; border-radius: 4px; cursor: pointer; }
.error { color: #d32f2f; font-size: 13px; }

.app { display: flex; height: 100vh; }
.col { border-right: 1px solid #d1d7db; display: flex; flex-direction: column; background: #fff; }
.col-numbers { width: 220px; }
.col-contacts { width: 280px; }
.col-chat { flex: 1; border-right: none; }

.col-header { display: flex; align-items: center; justify-content: space-between; padding: 12px; background: #f0f2f5; border-bottom: 1px solid #d1d7db; font-weight: 600; }
.col-header button { background: #25d366; color: #fff; border: none; border-radius: 4px; padding: 4px 10px; cursor: pointer; }

.list { list-style: none; margin: 0; padding: 0; overflow-y: auto; flex: 1; }
.list li { padding: 12px; border-bottom: 1px solid #f0f2f5; cursor: pointer; }
.list li:hover, .list li.active { background: #f0f2f5; }

.messages { flex: 1; overflow-y: auto; padding: 16px; display: flex; flex-direction: column; gap: 8px; }
.msg { max-width: 60%; padding: 8px 12px; border-radius: 8px; font-size: 14px; }
.msg.out { align-self: flex-end; background: #d9fdd3; }
.msg.in { align-self: flex-start; background: #fff; border: 1px solid #eee; }

.send-form { display: flex; padding: 12px; border-top: 1px solid #d1d7db; gap: 8px; }
.send-form input { flex: 1; padding: 10px; border: 1px solid #ccc; border-radius: 20px; }
.send-form button { padding: 10px 18px; background: #25d366; color: #fff; border: none; border-radius: 20px; cursor: pointer; }
.send-form button:disabled, .send-form input:disabled { opacity: 0.5; cursor: not-allowed; }

dialog { border: none; border-radius: 8px; padding: 20px; width: 300px; }
dialog form { display: flex; flex-direction: column; gap: 6px; }
dialog input { padding: 8px; border: 1px solid #ccc; border-radius: 4px; }
.dialog-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 12px; }