:root { --bg: #09090b; --panel: #18181b; --border: #27272a; --text: #e4e4e7; --accent: #fff; --danger: #ef4444; --blue: #3b82f6; }
body { margin: 0; font-family: 'Inter', sans-serif; background: var(--bg); color: var(--text); height: 100vh; overflow: hidden; }
a { text-decoration: none; color: inherit; }
.hidden { display: none !important; }
.btn { padding: 10px 20px; border-radius: 6px; border: 1px solid var(--border); background: var(--panel); color: var(--text); cursor: pointer; transition: 0.2s; font-weight: 500; }
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn-primary { background: var(--accent); color: black; border: none; }
.btn-danger { border-color: var(--danger); color: var(--danger); }
.input-field { width: 100%; padding: 12px; margin-bottom: 12px; background: var(--bg); border: 1px solid var(--border); color: white; border-radius: 6px; box-sizing: border-box; outline: none; }
.input-field:focus { border-color: var(--text); }
.center-screen { display: flex; justify-content: center; align-items: center; height: 100vh; flex-direction: column; }
.card { width: 400px; padding: 2rem; background: var(--panel); border: 1px solid var(--border); border-radius: 12px; box-shadow: 0 10px 30px rgba(0,0,0,0.5); }
.app-layout { display: flex; height: 100%; }
.sidebar { width: 70px; background: var(--panel); border-right: 1px solid var(--border); display: flex; flex-direction: column; align-items: center; padding-top: 20px; gap: 15px; }
.nav-btn { width: 45px; height: 45px; border-radius: 10px; display: flex; justify-content: center; align-items: center; cursor: pointer; color: #71717a; transition: 0.2s; font-size: 1.2rem; }
.nav-btn:hover { background: var(--border); color: var(--accent); }
.main-area { flex: 1; display: flex; flex-direction: column; }
.chat-list { flex: 1; overflow-y: auto; padding: 20px; display: flex; flex-direction: column; gap: 12px; }
.msg { padding: 10px 14px; border-radius: 12px; background: var(--panel); border: 1px solid var(--border); max-width: 80%; }
.msg.admin { border: 1px solid var(--accent); background: #1a1a1a; }
.msg-header { font-size: 0.75rem; color: #71717a; margin-bottom: 4px; display: flex; justify-content: space-between; }
.admin-container { padding: 40px; overflow-y: auto; height: 100%; }
.user-row { display: flex; justify-content: space-between; align-items: center; padding: 15px; border-bottom: 1px solid var(--border); }
.user-row:hover { background: var(--panel); }
.stat-card { background: var(--panel); padding: 20px; border-radius: 8px; border: 1px solid var(--border); display: inline-block; margin-right: 20px; min-width: 150px; }
.stat-val { font-size: 2.5rem; font-weight: bold; margin-top: 10px; }