*{box-sizing:border-box}body{margin:0;color:#16213e;background:#f5f7fa;font-family:Microsoft YaHei,Arial,sans-serif}.admin{min-height:100vh}.admin .ant-layout-sider{border-right:1px solid #edf0f5}.brand{height:68px;display:flex;align-items:center;padding:0 24px;font-size:20px;font-weight:700;color:#102a56}.brand span{color:#1677ff;margin-left:6px}.ant-layout-header{background:#fff;border-bottom:1px solid #edf0f5;display:flex;justify-content:space-between;align-items:center;padding:0 32px}.ant-layout-content{padding:32px;max-width:1280px;width:100%;margin:0 auto}.status-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;margin:20px 0 32px}.center{display:grid;place-items:center;height:300px}.student-shell{height:100vh;max-width:760px;margin:auto;background:#f5f7fa;display:flex;flex-direction:column;box-shadow:0 0 32px #d9e1ee}.student-shell header{background:#fff;padding:20px 28px;border-bottom:1px solid #e7ebf0;display:flex;gap:16px;align-items:baseline}.student-shell header b{font-size:20px;color:#102a56}.student-shell header span{color:#7a8699;font-size:13px}.student-shell main{flex:1;overflow:auto;padding:24px}.bubble{max-width:75%;width:max-content;padding:12px 15px;border-radius:10px;line-height:1.6;margin-bottom:14px}.bubble.assistant{background:#fff;color:#243b5a}.bubble.user{margin-left:auto;background:#1677ff;color:#fff}.student-shell footer{background:#fff;border-top:1px solid #e7ebf0;padding:16px;display:flex;gap:12px}.student-shell .login-main{display:grid;place-items:start center;padding:48px 24px}.login-card{width:100%;max-width:420px}@media(max-width:720px){.status-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.admin .ant-layout-sider{width:160px!important;flex:0 0 160px!important}.ant-layout-content{padding:20px}}