:root {
  --sidebar-bg: #1E1E2E;
  --sidebar-hover: #2A2A3C;
  --sidebar-active: #363650;
  --sidebar-text: #CDCDD6;
  --sidebar-text2: #8B8B9E;
  --main-bg: #F5F5F7;
  --card: #FFFFFF;
  --border: #E5E5EA;
  --text: #1C1C1E;
  --text2: #8E8E93;
  --blue: #007AFF;
  --blue-bg: #E8F2FF;
  --blue-hover: #0062CC;
  --purple: #5856D6;
  --orange: #FF9500;
  --green: #34C759;
  --red: #FF3B30;
  --user-bubble: #007AFF;
  --user-text: #FFFFFF;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(0,0,0,.06);
}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:-apple-system,'SF Pro Display','PingFang SC','Microsoft YaHei',sans-serif;background:var(--main-bg);height:100vh;height:var(--app-height,100dvh);display:flex;color:var(--text);overflow:hidden}

/* ═══ 登录 ═══ */
.login-overlay{position:fixed;inset:0;background:rgba(0,0,0,.5);display:flex;align-items:center;justify-content:center;z-index:999}
.login-box{background:var(--card);border-radius:16px;padding:40px 32px;width:380px;box-shadow:0 20px 60px rgba(0,0,0,.2)}
.login-box h2{font-size:24px;margin-bottom:4px;color:var(--text)}
.login-box .sub{color:var(--text2);font-size:13px;margin-bottom:24px}
.login-box input{width:100%;padding:12px 14px;border:1.5px solid var(--border);border-radius:10px;font-size:14px;margin-bottom:10px;outline:none;background:var(--main-bg);transition:.2s}
.login-box input:focus{border-color:var(--blue);background:var(--card)}
.login-box button{width:100%;padding:12px;background:var(--blue);color:#fff;border:none;border-radius:10px;font-size:15px;cursor:pointer;margin-top:6px;font-weight:500;transition:.2s}
.login-box button:hover{background:var(--blue-hover);transform:translateY(-1px)}
.login-box .toggle{color:var(--blue);font-size:13px;cursor:pointer;margin-top:12px;display:inline-block;text-decoration:none}
.login-box .error{color:var(--red);font-size:13px;margin-top:6px;min-height:18px}

/* ═══ 整体布局 ═══ */
.app{display:none;width:100%;height:100vh;height:var(--app-height,100dvh)}
.app.show{display:flex}

/* ═══ 左侧边栏 ═══ */
.sidebar{
  width:260px;min-width:260px;
  background:var(--sidebar-bg);
  display:flex;flex-direction:column;
  border-right:1px solid rgba(255,255,255,.06);
  user-select:none;
}
.sidebar-header{
  padding:16px 18px 12px;
  border-bottom:1px solid rgba(255,255,255,.06);
}
.sidebar-header .logo{
  display:flex;align-items:center;gap:10px;
}
.sidebar-header .logo-icon{
  width:32px;height:32px;border-radius:8px;
  background:linear-gradient(135deg,#007AFF,#5856D6);
  display:flex;align-items:center;justify-content:center;
  color:#fff;font-size:15px;font-weight:700;
}
.sidebar-header .logo-text{color:#fff;font-size:15px;font-weight:600}
.sidebar-header .logo-sub{color:var(--sidebar-text2);font-size:11px;margin-top:2px}

.sidebar-actions{padding:10px 12px;border-bottom:1px solid rgba(255,255,255,.06)}
.sidebar-actions button{
  width:100%;padding:8px;border-radius:8px;border:1px solid rgba(255,255,255,.1);
  background:transparent;color:var(--sidebar-text);font-size:13px;cursor:pointer;
  display:flex;align-items:center;gap:8px;justify-content:center;transition:.2s;
}
.sidebar-actions button:hover{background:var(--sidebar-hover)}

.sidebar-history{flex:1;overflow-y:auto;padding:8px}
.sidebar-history .section-label{
  font-size:11px;color:var(--sidebar-text2);padding:8px 8px 4px;text-transform:uppercase;letter-spacing:.5px;
}
.history-item{
  padding:8px 10px;border-radius:6px;cursor:pointer;font-size:12px;color:var(--sidebar-text);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;transition:.2s;margin-bottom:2px;
}
.history-item:hover{background:var(--sidebar-hover)}
.history-item.active{background:var(--sidebar-active);color:#fff}
.history-item .time{font-size:10px;color:var(--sidebar-text2);float:right;margin-top:2px}
.history-empty{color:var(--sidebar-text2);font-size:12px;padding:12px 8px;text-align:center}

.sidebar-footer{
  padding:12px;
  border-top:1px solid rgba(255,255,255,.06);
  display:flex;align-items:center;gap:10px;
}
.sidebar-footer .avatar{
  width:28px;height:28px;border-radius:50%;
  background:linear-gradient(135deg,#5856D6,#007AFF);
  display:flex;align-items:center;justify-content:center;
  color:#fff;font-size:12px;font-weight:600;flex-shrink:0;
}
.sidebar-footer .user-info{flex:1;min-width:0}
.sidebar-footer .user-name{color:#fff;font-size:12px;font-weight:500}
.sidebar-footer .user-role{color:var(--sidebar-text2);font-size:10px}
.sidebar-footer .admin-badge{background:var(--purple);color:#fff;font-size:9px;padding:1px 6px;border-radius:8px;
  display:none;
}
.sidebar-footer .admin-badge.show{display:inline!important}
.sidebar-footer .logout-btn{
  background:none;border:none;color:var(--sidebar-text2);font-size:14px;cursor:pointer;padding:4px;transition:.2s;
}
.sidebar-footer .logout-btn:hover{color:#fff}
.sidebar-mgmt-btn{
  display:none;
  background:var(--purple);border:none;color:#fff;font-size:13px;cursor:pointer;
  width:28px;height:28px;border-radius:6px;align-items:center;justify-content:center;transition:.2s;flex-shrink:0;
}
.sidebar-mgmt-btn:hover{opacity:.8;transform:scale(1.05)}

/* ═══ 主区域 ═══ */
.main-area{flex:1;display:flex;flex-direction:column;min-width:0}

/* 顶栏 */
.topbar{
  background:var(--card);border-bottom:1px solid var(--border);
  padding:8px 20px;display:flex;align-items:center;gap:6px;flex-shrink:0;
  overflow-x:auto;
}
.topbar .assistant-chip{
  padding:5px 14px;border-radius:14px;border:1.5px solid var(--border);
  white-space:nowrap;font-size:12px;cursor:pointer;background:var(--card);
  color:var(--text2);transition:.2s;font-weight:500;
}
.topbar .assistant-chip:hover{border-color:var(--blue);color:var(--blue);background:var(--blue-bg)}
.topbar .assistant-chip.active{background:var(--blue);color:#fff;border-color:var(--blue)}
.topbar .assistant-chip.auto-chip{font-weight:600}
.topbar .assistant-chip.auto-chip.active{background:var(--orange);border-color:var(--orange)}
.topbar .assistant-chip.studio-mode-only{display:none}.topbar .assistant-chip.studio-mode-only{font-weight:600}
body.studio-mode .topbar .assistant-chip.regular-mode-only{display:none}
body.studio-mode .topbar .assistant-chip.studio-mode-only{display:inline-flex}
body.studio-mode .topbar .assistant-chip.studio-mode-only.active{background:var(--green,#16a34a);border-color:var(--green,#16a34a);color:#fff}
body.studio-mode .topbar .assistant-chip.studio-mode-only.auto-chip.active{background:var(--orange);border-color:var(--orange);color:#fff}
body.studio-mode .sidebar-teachme-card{display:none}
body.studio-mode .teachme-float-btn{display:none}
.topbar .spacer{flex:1}
.topbar .countdown{display:none;
  color:var(--orange);font-size:11px;background:#FFF3E0;padding:3px 10px;border-radius:10px;
  white-space:nowrap;display:none;
}
.topbar .countdown.show{display:inline!important}
.topbar .admin-btn{padding:5px 12px;background:var(--purple);color:#fff;border:none;border-radius:10px;font-size:11px;cursor:pointer;white-space:nowrap;transition:.2s;display:none;
  padding:5px 12px;background:var(--purple);color:#fff;border:none;border-radius:10px;
  font-size:11px;cursor:pointer;white-space:nowrap;display:none;transition:.2s;
}
.topbar .admin-btn:hover{opacity:.85}

/* 对话区 */
.chat-area{flex:1;overflow-y:auto;padding:20px 24px;display:flex;flex-direction:column;gap:16px}
.chat-welcome{text-align:center;padding:80px 20px;color:var(--text2)}
.chat-welcome .icon{font-size:56px;margin-bottom:16px;opacity:.8}
.chat-welcome h3{font-size:20px;margin-bottom:8px;color:var(--text);font-weight:600}
.chat-welcome p{font-size:14px;line-height:1.6}

.msg-group{display:flex;flex-direction:column;gap:4px}
.msg{max-width:78%;padding:10px 16px;border-radius:14px;line-height:1.65;font-size:14px;word-break:break-word;animation:fadeIn .25s}
.msg.user{align-self:flex-end;background:var(--user-bubble);color:var(--user-text);border-bottom-right-radius:6px}
.msg.assistant{align-self:flex-start;background:var(--card);color:var(--text);border-bottom-left-radius:6px;box-shadow:var(--shadow);border:1px solid var(--border)}
.msg .label{font-size:11px;opacity:.7;margin-bottom:4px;font-weight:500}
.msg.assistant .label{color:var(--blue)}
.msg p{margin:4px 0}
.msg pre{background:var(--main-bg);padding:10px;border-radius:8px;overflow-x:auto;font-size:12px;margin:6px 0;border:1px solid var(--border)}
.msg code{background:var(--main-bg);padding:2px 5px;border-radius:4px;font-size:12px}
.msg table{border-collapse:collapse;width:100%;margin:6px 0;font-size:12px}
.msg th,td{border:1px solid var(--border);padding:4px 8px;text-align:left}
.msg th{background:var(--main-bg);font-weight:600}
.msg ul,.msg ol{padding-left:20px;margin:4px 0}
.msg h3{font-size:15px;margin:10px 0 6px;font-weight:600}
.msg h4{font-size:14px;margin:8px 0 4px;font-weight:600}
.msg blockquote{border-left:3px solid var(--blue);margin:8px 0;padding:4px 12px;background:var(--blue-bg);border-radius:0 6px 6px 0}

.typing{align-self:flex-start;padding:12px 16px;display:flex;gap:4px}
.typing span{width:6px;height:6px;background:var(--text2);border-radius:50%;animation:bounce 1.4s infinite}
.typing span:nth-child(2){animation-delay:.2s}
.typing span:nth-child(3){animation-delay:.4s}
@keyframes bounce{0%,60%,100%{transform:translateY(0);opacity:.3}30%{transform:translateY(-5px);opacity:1}}
@keyframes fadeIn{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}

/* 输入区 */
.input-area{
  padding:12px 20px 16px;background:var(--main-bg);flex-shrink:0;
  display:flex;gap:8px;align-items:flex-end;
}
.input-box{
  flex:1;background:var(--card);border:1.5px solid var(--border);border-radius:16px;
  display:flex;align-items:flex-end;padding:4px;transition:.2s;
}
.input-box:focus-within{border-color:var(--blue);box-shadow:0 0 0 3px rgba(0,122,255,.1)}
.input-box textarea{
  flex:1;border:none;outline:none;padding:8px 10px;font-size:14px;resize:none;
  max-height:120px;background:transparent;font-family:inherit;line-height:1.5;
}
.input-box button{
  padding:8px 16px;background:var(--blue);color:#fff;border:none;border-radius:12px;
  font-size:13px;cursor:pointer;margin:2px;white-space:nowrap;font-weight:500;transition:.2s;
}
.input-box button:hover{background:var(--blue-hover)}
.input-box button:disabled{background:#C7C7CC}
.input-box .mic-btn{
  padding:8px 8px;background:var(--main-bg);color:var(--text2);border:none;border-radius:12px;
  font-size:16px;cursor:pointer;margin:2px 0 2px 2px;transition:.2s;min-width:36px;
}
.input-box .mic-btn:hover{background:var(--blue-bg);color:var(--blue)}
.input-box .mic-btn.recording{background:var(--red);color:#fff;animation:pulse 1.2s infinite}
@keyframes pulse{0%,100%{box-shadow:0 0 0 0 rgba(255,59,48,.4)}50%{box-shadow:0 0 0 8px rgba(255,59,48,0)}}
.upload-bar{
  display:flex;gap:6px;align-items:center;font-size:11px;color:var(--text2);padding:0 4px 4px;
}
.upload-bar .upload-btn{
  cursor:pointer;color:var(--blue);font-size:12px;padding:2px 6px;border-radius:4px;
  background:var(--blue-bg);transition:.2s;
}
.upload-bar .upload-btn:hover{background:var(--blue);color:#fff}
.upload-status{padding:4px 12px;font-size:12px;color:var(--green);display:none}

/* ═══ 文件侧栏 ═══ */
.file-panel{
  position:fixed;right:0;top:0;bottom:0;width:320px;background:var(--card);
  box-shadow:-4px 0 24px rgba(0,0,0,.1);transform:translateX(100%);transition:.3s;
  z-index:200;display:flex;flex-direction:column;
}
.file-panel.open{transform:translateX(0)}
.file-panel-header{
  padding:16px;background:var(--sidebar-bg);color:#fff;display:flex;
  justify-content:space-between;align-items:center;font-weight:600;font-size:14px;
}
.file-panel-header button{background:none;border:none;color:#fff;font-size:20px;cursor:pointer}
.file-panel-body{flex:1;overflow-y:auto;padding:12px}
.file-item{
  display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:10px;
  cursor:pointer;transition:.2s;margin-bottom:2px;
}
.file-item:hover{background:var(--main-bg)}
.file-item .file-icon{font-size:20px;flex-shrink:0}
.file-item .file-info{flex:1;min-width:0}
.file-item .file-name{font-size:13px;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.file-item .file-meta{font-size:11px;color:var(--text2)}
.file-item .file-act{opacity:0;transition:.2s;cursor:pointer;font-size:14px;padding:2px}
.file-item:hover .file-act{opacity:1}
.file-act:hover{transform:scale(1.15)}

/* ═══ 弹窗 ═══ */
.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.4);z-index:300;display:none;align-items:center;justify-content:center}
.modal-overlay.show{display:flex}
.modal{background:var(--card);border-radius:14px;width:85%;max-width:800px;max-height:82vh;display:flex;flex-direction:column;box-shadow:0 20px 60px rgba(0,0,0,.2)}
.modal-header{padding:16px 20px;border-bottom:1px solid var(--border);display:flex;justify-content:space-between;align-items:center}
.modal-header h3{font-size:15px;font-weight:600}
.modal-body{flex:1;overflow-y:auto;padding:20px;font-size:13px;line-height:1.7;white-space:pre-wrap;font-family:monospace}
.modal-footer{padding:12px 20px;border-top:1px solid var(--border);display:flex;gap:8px;justify-content:flex-end}
.modal-footer button{padding:8px 18px;border-radius:8px;border:1px solid var(--border);background:var(--card);cursor:pointer;font-size:13px;transition:.2s}
.modal-footer button.primary{background:var(--blue);color:#fff;border:none}
.modal-footer button.primary:hover{background:var(--blue-hover)}

/* ═══ 管理面板 ═══ */
.admin-panel{position:fixed;inset:0;background:rgba(0,0,0,.4);z-index:300;display:none;align-items:center;justify-content:center}
.admin-panel.show{display:flex}
.admin-dialog{background:var(--card);border-radius:14px;width:560px;max-height:85vh;display:flex;flex-direction:column;box-shadow:0 20px 60px rgba(0,0,0,.2)}
.admin-dialog .header{
  padding:16px 20px;border-bottom:1px solid var(--border);
  display:flex;justify-content:space-between;align-items:center;flex-shrink:0;
}
.admin-dialog .header button{background:none;border:none;font-size:18px;cursor:pointer;color:var(--text2)}
.admin-dialog .body{flex:1;overflow-y:auto;padding:16px 20px}
.admin-tabs{display:flex;gap:4px;margin-bottom:16px;border-bottom:1px solid var(--border);padding-bottom:4px}
.admin-tab{
  padding:6px 14px;cursor:pointer;font-size:12px;color:var(--text2);border-bottom:2px solid transparent;
  transition:.2s;margin-bottom:-5px;
}
.admin-tab.active{color:var(--blue);border-bottom-color:var(--blue);font-weight:600}
.admin-tab:hover{color:var(--blue)}

.user-row{
  display:flex;justify-content:space-between;align-items:center;
  padding:10px 12px;border-radius:8px;background:var(--main-bg);margin-bottom:4px;font-size:13px;
}
.user-row .user-meta{color:var(--text2);font-size:11px;margin-top:2px}
.del-btn{background:var(--red);color:#fff;border:none;padding:4px 14px;border-radius:6px;font-size:11px;cursor:pointer;transition:.2s;white-space:nowrap}
.del-btn:hover{opacity:.85}

.reg-box{padding:12px;background:var(--main-bg);border-radius:10px;margin-top:8px}
.reg-box input{padding:7px 10px;border:1px solid var(--border);border-radius:6px;font-size:12px;margin-right:6px;margin-bottom:6px;width:120px}
.reg-box button{padding:7px 16px;background:var(--green);color:#fff;border:none;border-radius:6px;font-size:12px;cursor:pointer}

.export-section button{
  padding:8px 16px;background:var(--main-bg);border:1px solid var(--border);
  border-radius:8px;cursor:pointer;font-size:12px;margin:4px 4px 4px 0;transition:.2s;
}
.export-section button:hover{background:var(--blue);color:#fff;border-color:var(--blue)}
.export-section pre{
  max-height:200px;overflow-y:auto;background:var(--main-bg);padding:10px;border-radius:8px;font-size:11px;margin-top:8px;
}

/* v16 新增样式 */
.status-hint{
  text-align:center;padding:10px 16px;color:var(--text2);font-size:13px;
  background:var(--card);border-radius:10px;margin:4px auto;
  max-width:260px;border:1px solid var(--border);animation:fadeIn .3s;
  align-self:center;
}
.msg.coach{
  align-self:flex-start;background:#F0FFF4;color:var(--text);
  border-bottom-left-radius:6px;box-shadow:var(--shadow);
  border:1px solid #C6F6D5;padding:10px 16px;border-radius:14px;
  line-height:1.65;font-size:14px;animation:fadeIn .3s;
}
.msg.coach .label{color:#38A169}
.template-bar{
  display:flex;gap:6px;padding:6px 20px 0;flex-wrap:wrap;flex-shrink:0;
}
.template-bar button{
  padding:5px 12px;border-radius:14px;border:1.5px solid var(--border);
  font-size:11px;cursor:pointer;background:var(--card);color:var(--text2);
  transition:.2s;white-space:nowrap;
}
.template-bar button:hover{border-color:var(--blue);color:var(--blue);background:var(--blue-bg)}
.export-topbar-btn{
  padding:5px 10px;background:var(--card);border:1.5px solid var(--border);
  border-radius:10px;font-size:11px;cursor:pointer;color:var(--text2);
  transition:.2s;white-space:nowrap;
}
.export-topbar-btn:hover{background:var(--blue);color:#fff;border-color:var(--blue)}


/* 响应式 */
@media(max-width:768px){
  .file-panel{width:100%}
}

/* ═══ 消息排版升级 v14.1 ═══ */
.msg-content { font-size: 14px; line-height: 1.7; color: var(--text); word-break: break-word; }
.msg-content p { margin: 10px 0; }
.msg-content h3 { font-size: 17px; margin: 18px 0 8px; font-weight: 700; color: var(--text); }
.msg-content h4 { font-size: 15px; margin: 14px 0 6px; font-weight: 600; }
.msg-content .table-wrapper { overflow-x: auto; -webkit-overflow-scrolling: touch; margin: 10px 0; border: 1px solid var(--border); border-radius: 6px; }
.msg-content table { border-collapse: collapse; min-width: 100%; font-size: 13px; }
.msg-content th { background: var(--blue); color: #fff; padding: 8px 12px; text-align: left; position: sticky; top: 0; }
.msg-content td { padding: 6px 12px; border-bottom: 1px solid var(--border); }
.msg-content tr:nth-child(even) td { background: rgba(0,0,0,0.03); }
.msg-content ul, .msg-content ol { padding-left: 22px; margin: 8px 0; }
.msg-content li { margin: 4px 0; }
.msg-content code { background: var(--card); padding: 2px 6px; border-radius: 4px; font-size: 13px; }
.msg-content pre { background: var(--card); padding: 12px; border-radius: 6px; overflow-x: auto; font-size: 13px; }
.msg-content td table { font-size: 12px; }
.msg-content.compact p { margin: 3px 0; }
.msg-content.compact table { font-size: 12px; }
.msg-content.compact h3 { margin: 8px 0 4px; font-size: 15px; }
.msg-actions { display: flex; gap: 8px; margin-top: 8px; flex-wrap: wrap; }
.msg-actions button { padding: 3px 10px; font-size: 11px; border: 1px solid var(--border); border-radius: 4px; cursor: pointer; background: var(--card); color: var(--text2); transition: all .15s; }
.msg-actions button:hover { background: var(--blue); color: #fff; border-color: var(--blue); }
@media (max-width: 768px) { .msg-content table { font-size: 11px; } .msg-content th, .msg-content td { padding: 4px 6px; } }


/* ═══ TeachMe 知识库面板 ═══ */
.teachme-overlay{position:fixed;inset:0;z-index:200;background:rgba(0,0,0,.4);display:none;align-items:center;justify-content:center}
.teachme-overlay.show{display:flex}
.teachme-panel{background:#fff;border-radius:16px;width:90vw;max-width:1100px;height:85vh;display:flex;flex-direction:column;box-shadow:0 20px 60px rgba(0,0,0,.2);overflow:hidden}
.teachme-header{display:flex;align-items:center;padding:14px 24px;border-bottom:1px solid var(--border,#e2e8f0);flex-shrink:0}
.teachme-header h3{font-size:18px;font-weight:700;color:#1a365d;margin:0}
.teachme-header .teachme-subtitle{font-size:12px;color:#718096;margin-left:12px}
.teachme-header button{margin-left:auto;background:none;border:none;font-size:20px;cursor:pointer;color:#718096;padding:4px 8px;border-radius:6px}
.teachme-header button:hover{background:#f7fafc}
.teachme-body{display:flex;flex:1;overflow:hidden}
.teachme-sidebar{width:220px;flex-shrink:0;border-right:1px solid var(--border,#e2e8f0);overflow-y:auto;padding:16px 0;background:#fafbfc}
.teachme-nav-title{font-size:11px;color:#718096;padding:0 16px 8px;font-weight:600;text-transform:uppercase;letter-spacing:.5px}
.teachme-nav-item{display:block;padding:8px 16px;cursor:pointer;font-size:13px;color:#2d3748;border-left:3px solid transparent;transition:all .15s}
.teachme-nav-item:hover{background:#edf2f7;color:#1a365d}
.teachme-nav-item.active{background:#ebf8ff;border-left-color:#3182ce;color:#2c5282;font-weight:600}
.teachme-nav-item .nav-desc{font-size:11px;color:#a0aec0;display:block;margin-top:1px}
.teachme-content{flex:1;overflow-y:auto;padding:24px;background:#fff}
.teachme-welcome{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;color:#a0aec0}
.teachme-welcome .icon{font-size:48px;margin-bottom:12px}
.teachme-welcome h4{font-size:18px;color:#2d3748;margin-bottom:6px}
.teachme-welcome p{font-size:13px}
.teachme-btn{margin-left:auto !important}

/* 对话记录在线浏览样式 */
.chat-preview-window{border:1px solid #e2e8f0;border-radius:10px;margin-bottom:12px;overflow:hidden}
.chat-preview-header{display:flex;justify-content:space-between;align-items:center;padding:10px 14px;background:#f7fafc;cursor:pointer;font-size:13px;font-weight:600;color:#2d3748}
.chat-preview-header:hover{background:#edf2f7}
.chat-preview-header .meta{font-weight:400;font-size:11px;color:#718096}
.chat-preview-body{padding:8px 14px 12px;max-height:500px;overflow-y:auto;background:#fff}
.chat-preview-msg{display:flex;margin:6px 0;gap:8px}
.chat-preview-msg .label{flex-shrink:0;font-size:11px;padding:2px 8px;border-radius:4px;min-width:32px;text-align:center;font-weight:600}
.chat-preview-msg.user .label{background:#bee3f8;color:#2a4365}
.chat-preview-msg.assistant .label{background:#c6f6d5;color:#22543d}
.chat-preview-msg .text{font-size:12px;line-height:1.6;color:#2d3748;word-break:break-word;flex:1}
.chat-preview-msg .time{font-size:10px;color:#a0aec0;flex-shrink:0;margin-top:2px}
.teachme-loading{text-align:center;padding:60px 20px;color:#718096;font-size:14px}
.teachme-error{text-align:center;padding:40px 20px;color:#e53e3e;font-size:13px}
@media(max-width:768px){.teachme-sidebar{width:160px}.teachme-content{padding:14px}}

.sidebar-teachme-card{display:flex;align-items:center;gap:10px;padding:10px 12px;margin:0 8px 8px;background:linear-gradient(135deg,#1a365d,#2b6cb0);border-radius:8px;cursor:pointer;transition:.2s;border:1px solid rgba(255,255,255,.1)}
.sidebar-teachme-card:hover{background:linear-gradient(135deg,#2b6cb0,#3182ce);transform:translateY(-1px);box-shadow:0 4px 12px rgba(49,130,206,.3)}
.stc-icon{font-size:22px;flex-shrink:0}
.stc-info{flex:1;min-width:0}
.stc-title{color:#fff;font-size:13px;font-weight:600;margin-bottom:2px}
.stc-desc{color:rgba(255,255,255,.7);font-size:11px;line-height:1.3}

.teachme-float-btn{position:fixed;bottom:80px;right:24px;width:50px;height:50px;border-radius:50%;background:linear-gradient(135deg,#1a365d,#2b6cb0);color:#fff;font-size:22px;border:none;cursor:pointer;box-shadow:0 4px 16px rgba(43,108,176,.4);z-index:100;display:flex;align-items:center;justify-content:center;transition:.2s}
.teachme-float-btn:hover{transform:scale(1.1);box-shadow:0 6px 20px rgba(43,108,176,.5)}
.teachme-float-btn:active{transform:scale(.95)}

</style>
/* ═══ 来源标注样式 ═══ */
.msg-sources{padding:6px 16px 10px 60px;font-size:12px;color:var(--text2);line-height:1.6}
.msg-sources::before{content:''}

/* ═══ 辅导模式开关 ═══ */
#coachToggle{border:1px solid var(--border)!important;background:transparent!important;color:var(--text2)!important;font-size:12px!important}
#coachToggle.active{border-color:var(--primary)!important;color:var(--primary)!important;background:rgba(59,130,246,.06)!important}

/* ═══════════════════════════════════════════
   移动端优化 (2026-07-23)
   抽屉式侧边栏 + 输入优化 + 多断点 + 安全区
   ═══════════════════════════════════════════ */

/* --- 汉堡菜单按钮（默认隐藏，仅移动端显示） --- */
.mobile-menu-btn{
  display:none;
  position:fixed;top:10px;left:10px;z-index:310;
  width:44px;height:44px;border-radius:12px;
  background:var(--card);border:1.5px solid var(--border);
  font-size:20px;color:var(--text);cursor:pointer;
  box-shadow:var(--shadow);align-items:center;justify-content:center;
}
/* --- 侧边栏遮罩层 --- */
.sidebar-overlay{
  position:fixed;inset:0;z-index:290;background:rgba(0,0,0,.45);
  opacity:0;pointer-events:none;transition:opacity .3s;
}
.sidebar-overlay.show{opacity:1;pointer-events:auto}

/* --- 平板断点 (768-1024px)：侧边栏变窄但保留 --- */
@media(max-width:1024px) and (min-width:769px){
  .sidebar{width:200px;min-width:200px}
}

/* --- 手机断点 (≤768px)：抽屉式侧边栏 --- */
@media(max-width:768px){
  .mobile-menu-btn{display:flex}
  .sidebar{
    position:fixed;left:0;top:0;bottom:0;z-index:300;
    width:270px;min-width:270px;
    transform:translateX(-105%);transition:transform .3s ease;
    box-shadow:4px 0 24px rgba(0,0,0,.25);
  }
  .sidebar.open{transform:translateX(0)}
  /* 顶栏给汉堡按钮让位 */
  .topbar{padding:8px 12px 8px 60px}
  /* 对话区减小内边距，气泡加宽 */
  .chat-area{padding:14px 12px;gap:12px}
  .msg{max-width:88%;font-size:14px}
  .msg-sources{padding-left:16px}
  /* 欢迎区缩小 */
  .chat-welcome{padding:50px 16px}
  .chat-welcome .icon{font-size:44px}
  .chat-welcome h3{font-size:17px}
  /* 模板栏：滑动卡片(scroll-snap吸附+卡片视觉) */
  .template-bar{
    overflow-x:auto;-webkit-overflow-scrolling:touch;
    scroll-snap-type:x mandatory;
    padding:10px 12px;gap:10px;flex-wrap:nowrap;
    scrollbar-width:none;
  }
  .template-bar::-webkit-scrollbar{display:none}
  .template-bar button{
    flex-shrink:0;scroll-snap-align:start;
    padding:10px 16px;font-size:13px;border-radius:16px;
    background:var(--card);border:1.5px solid var(--border);
    box-shadow:0 1px 4px rgba(0,0,0,.06);
    transition:transform .15s,box-shadow .15s,border-color .2s;
  }
  .template-bar button:active{
    transform:scale(.95);box-shadow:0 0 0 rgba(0,0,0,0);
    border-color:var(--blue);color:var(--blue);background:var(--blue-bg);
  }
  .template-bar span{scroll-snap-align:start}
  /* 输入区优化：16px字号防iOS缩放 + 大按钮 + 安全区 */
  .input-area{
    padding:10px 12px calc(12px + env(safe-area-inset-bottom));
    gap:8px;
  }
  .input-box textarea{font-size:16px;padding:10px 12px}
  .input-box button{padding:12px 18px;font-size:14px;border-radius:14px}
  .input-box .mic-btn{padding:12px 10px;font-size:18px;min-width:44px}
  /* 助手标签：横向滑动+吸附，隐藏滚动条 */
  .topbar{scroll-snap-type:x proximity;scrollbar-width:none;padding:8px 12px}
  .topbar::-webkit-scrollbar{display:none}
  .topbar .assistant-chip{padding:8px 14px;font-size:13px;scroll-snap-align:start;flex-shrink:0}
  /* TeachMe面板全屏化 */
  .teachme-panel{width:100vw;max-width:100vw;height:100vh;border-radius:0}
  .teachme-body{flex-direction:column}
  .teachme-sidebar{width:100%;height:auto;max-height:180px;border-right:none;border-bottom:1px solid var(--border)}
  .teachme-float-btn{bottom:calc(80px + env(safe-area-inset-bottom))}
}

/* --- 小屏手机断点 (≤480px)：进一步压缩 --- */
@media(max-width:480px){
  .sidebar{width:82vw;min-width:82vw}
  .msg{max-width:92%}
  .chat-area{padding:12px 10px}
  .input-area{padding:8px 10px calc(10px + env(safe-area-inset-bottom))}
  .topbar{padding:8px 10px 8px 56px}
  .topbar .countdown{display:none!important}
}