:root { --green:#1f9f75; --bg:#f4f8f7; --text:#1c2b28; }
*{box-sizing:border-box} body{margin:0;font-family:Arial,sans-serif;background:var(--bg);color:var(--text)}
a{color:var(--green);text-decoration:none}
.auth-page{display:flex;min-height:100vh;align-items:center;justify-content:center}
.auth-card{background:#fff;padding:24px;border-radius:14px;width:min(420px,95%);box-shadow:0 8px 24px rgba(0,0,0,.08)}
.auth-card input,.auth-card button{width:100%;padding:12px;margin:8px 0;border-radius:10px;border:1px solid #d7e2df}
.error{color:#c0392b}.success{color:#1e8449}
.app-layout{display:grid;grid-template-columns:300px 1fr;height:100vh}
.sidebar{background:#fff;border-right:1px solid #e4ecea;padding:16px;display:flex;flex-direction:column}
.logo{max-height:40px;max-width:160px;display:block;margin-bottom:8px}
.logo-wrap h2{margin:4px 0 12px 0}
.full{width:100%}
.conversation-list{overflow:auto;margin:12px 0;display:flex;flex-direction:column;gap:8px}
.conversation-item{border:none;background:#eef8f5;padding:10px;border-radius:10px;text-align:left;cursor:pointer}
.sidebar-footer{margin-top:auto;display:flex;flex-direction:column;gap:6px}
.main{display:flex;flex-direction:column;position:relative}
.welcome{padding:30px;overflow:auto}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:12px;margin-bottom:18px}
.mode-card,.prompt-card,.stat-card{background:#fff;border:1px solid #deebe7;padding:14px;border-radius:14px;cursor:pointer}
.chat-pane{flex:1;overflow:auto;padding:20px}
.messages{display:flex;flex-direction:column;gap:12px;max-width:900px;margin:0 auto}
.msg{padding:12px 14px;border-radius:14px;line-height:1.45;position:relative}
.msg.user{background:#dff5ec;align-self:flex-end;max-width:80%}
.msg.assistant{background:#fff;align-self:flex-start;max-width:85%;border:1px solid #e2ece9}
.copy-btn{position:absolute;top:6px;right:8px;font-size:12px}
.chat-input-wrap{display:grid;grid-template-columns:180px 1fr 100px;gap:10px;padding:14px;border-top:1px solid #e3ece9;background:#fff}
.chat-input-wrap input,.chat-input-wrap select{padding:12px;border-radius:10px;border:1px solid #d5e1de}
.btn-primary{background:var(--green);color:#fff;border:none;border-radius:10px;padding:12px;cursor:pointer}
.hidden{display:none}
.admin-layout{display:grid;grid-template-columns:220px 1fr;min-height:100vh}
.admin-sidebar{background:#fff;border-right:1px solid #e3ece9;padding:16px;display:flex;flex-direction:column;gap:8px}
.admin-main{padding:24px;overflow:auto}
.admin-form{display:flex;flex-direction:column;gap:10px;max-width:700px}
.admin-form input,.admin-form textarea,.admin-form select{padding:10px;border:1px solid #d8e3e0;border-radius:8px}
.table{width:100%;border-collapse:collapse;background:#fff}
.table th,.table td{padding:8px;border:1px solid #e4ecea;vertical-align:top}
@media (max-width: 900px){
  .app-layout{grid-template-columns:1fr}
  .sidebar{height:auto;max-height:35vh}
  .chat-input-wrap{grid-template-columns:1fr}
}