:root {
  --bg: #ffffff;
  --panel: #f8f8f8;
  --panel-2: #f2f2f2;
  --border: #e5e5e5;
  --text: #000000;
  --muted: #666666;
  --accent: #3ad1c5;
  --accent-2: #000000; 
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font-family: "Arial", sans-serif; }

.inbox-app { display: grid; grid-template-columns: 300px 1fr; height: 100vh; }

.sidebar { background: var(--panel); border-right: 1px solid var(--border); display: flex; flex-direction: column; }
.sidebar-header { padding: 16px; border-bottom: 1px solid var(--border); }
.sidebar-header h2 { margin: 0 0 8px 0; font-size: 18px; }
.current-user { display: grid; grid-template-columns: 60px 1fr; gap: 8px; align-items: center; margin-bottom: 8px; color: var(--muted); }
.current-user select { width: 100%; padding: 8px; background: var(--panel-2); color: var(--text); border: 1px solid var(--border); border-radius: 8px; }
.search input { width: 100%; padding: 8px 10px; background: var(--panel-2); color: var(--text); border: 1px solid var(--border); border-radius: 8px; }

.manager-list { list-style: none; margin: 0; padding: 8px; overflow-y: auto; height: calc(100vh - 150px); }
.manager-item { display: grid; grid-template-columns: 36px 1fr auto; align-items: center; gap: 10px; padding: 10px; border-radius: 10px; cursor: pointer; }
.manager-item:hover { background: rgba(255,255,255,0.03); }
.avatar { width: 36px; height: 36px; border-radius: 50%; background: var(--accent); display: grid; place-items: center; color: #fff; font-weight: 700; }
.manager-meta { display: grid; gap: 2px; }
.manager-name { font-size: 14px; font-weight: 600; }
.manager-role { font-size: 12px; color: var(--muted); }
.last-message { font-size: 12px; color: var(--muted); }

.conversation { display: grid; grid-template-rows: auto 1fr auto; }
.conversation-header { background: var(--panel); border-bottom: 1px solid var(--border); padding: 12px 16px; }
.recipient h3 { margin: 0; font-size: 16px; }
.recipient small { color: var(--muted); }

.messages { padding: 16px; overflow-y: auto; }
.message { max-width: 70%; margin-bottom: 8px; padding: 10px 12px; border-radius: 14px; background: var(--panel); border: 1px solid var(--border); }
.message.me { margin-left: auto; background: #e9fbf9; border-color: #c9f3ef; }
.message .meta { font-size: 11px; color: var(--muted); margin-top: 6px; }

.composer { border-top: 1px solid var(--border); background: var(--panel); padding: 10px; }
#messageForm { display: grid; grid-template-columns: 1fr auto; gap: 8px; }
#messageInput { padding: 12px 14px; border-radius: 12px; border: 1px solid var(--border); background: var(--panel-2); color: var(--text); }
#sendBtn { padding: 12px 18px; border-radius: 12px; border: 1px solid var(--border); background: var(--accent); color: #fff; font-weight: 600; cursor: pointer; }
#sendBtn:hover { filter: brightness(1.05); }

@media (max-width: 900px) {
  .inbox-app { grid-template-columns: 1fr; }
  .sidebar { height: 40vh; }
  .manager-list { height: calc(40vh - 150px); }
}