:root {
  --bg: #FAF9F6;
  --bg-warm: #F5F1EB;
  --bg-card: #FFFFFF;
  --accent: #D97757;
  --accent-hover: #C4613F;
  --accent-light: rgba(217,119,87,0.1);
  --brown: #8B6F4E;
  --brown-light: rgba(139,111,78,0.1);
  --text: #2D2A26;
  --text-sec: #6B6560;
  --text-muted: #9B958E;
  --beige: #E8DFD3;
  --cream: #F0EAE0;
  --amber: #E5A54B;
  --green: #4CAF7D;
  --red: #E05555;
  --blue: #5B8DEF;
  --shadow-sm: 0 1px 3px rgba(45,42,38,0.06);
  --shadow-md: 0 4px 16px rgba(45,42,38,0.08);
  --shadow-lg: 0 8px 32px rgba(45,42,38,0.1);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: all 0.25s cubic-bezier(0.4,0,0.2,1);
  --drawer-width: 380px;
  --sidebar-w: 320px;
  --green-light: rgba(76,175,125,0.10);
  --red-light: rgba(224,85,85,0.10);
  --amber-light: rgba(229,165,75,0.12);
  --blue-light: rgba(91,141,239,0.10);
  --purple: #7B6CB0;
  --purple-light: rgba(123,108,176,0.10);
  --radius-lg: 20px;
  --bubble-me: #D97757;
  --bubble-them: #FFFFFF;
}
*{margin:0;padding:0;box-sizing:border-box}
html,body{height:100%;overflow:hidden;-webkit-text-size-adjust:100%}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI','Inter','Helvetica Neue',Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased;-webkit-touch-callout:none;-webkit-user-select:none;user-select:none}
/* Allow text selection inside message bubbles for copy selection */
.msg-bubble{-webkit-touch-callout:default;-webkit-user-select:text;user-select:text}
/* Input fields need selection */
input,textarea{-webkit-user-select:text;user-select:text}
::-webkit-scrollbar{width:6px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:var(--beige);border-radius:3px}
::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}
input,textarea,button,select{font-family:inherit;font-size:inherit}
button{cursor:pointer;border:none;background:none}

/* ═══════════════ Auth Page ═══════════════ */
#authPage{display:flex;align-items:center;justify-content:center;height:100vh;height:100dvh;background:var(--bg-warm);position:relative;overflow:hidden}
/* Loading splash shown while auto-login in progress */
#loadingSplash{position:fixed;inset:0;background:var(--bg-warm);display:none;align-items:center;justify-content:center;z-index:9999;flex-direction:column;gap:16px}
#loadingSplash .spinner{width:36px;height:36px;border:3px solid var(--beige);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}
#loadingSplash .hint{font-size:14px;color:var(--text-muted)}
#authPage::before{content:'';position:absolute;top:-200px;right:-200px;width:600px;height:600px;background:radial-gradient(circle,var(--accent-light) 0%,transparent 70%);border-radius:50%;pointer-events:none}
#authPage::after{content:'';position:absolute;bottom:-150px;left:-150px;width:400px;height:400px;background:radial-gradient(circle,rgba(229,165,75,0.08) 0%,transparent 70%);border-radius:50%;pointer-events:none}
.auth-box{background:var(--bg-card);border:1px solid var(--beige);border-radius:20px;padding:40px;width:400px;max-width:90vw;box-shadow:var(--shadow-lg);position:relative;z-index:1}
.auth-box h1{text-align:center;font-size:28px;font-weight:800;margin-bottom:8px;letter-spacing:-0.5px}
.auth-box h1 .grad{background:linear-gradient(135deg,var(--accent),var(--brown));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.auth-box .subtitle{text-align:center;color:var(--text-sec);font-size:14px;margin-bottom:28px}
.auth-tabs{display:flex;gap:0;background:var(--cream);border-radius:10px;padding:3px;margin-bottom:24px;border:1px solid var(--beige)}
.auth-tab{flex:1;padding:8px;text-align:center;font-size:14px;font-weight:600;border-radius:8px;transition:var(--transition);color:var(--text-muted)}
.auth-tab.active{background:var(--bg-card);color:var(--text);box-shadow:var(--shadow-sm)}
.auth-tab:hover:not(.active){color:var(--text-sec)}
.form-group{margin-bottom:16px}
.form-group label{display:block;font-size:13px;font-weight:600;color:var(--text-sec);margin-bottom:6px}
.form-group input{width:100%;padding:10px 14px;border:1px solid var(--beige);border-radius:10px;font-size:14px;transition:var(--transition);background:var(--bg);outline:none}
.form-group input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-light)}
.btn-primary{width:100%;padding:12px;background:var(--accent);color:#fff;border-radius:10px;font-size:15px;font-weight:600;transition:var(--transition);box-shadow:0 4px 16px rgba(217,119,87,0.3)}
.btn-google{width:100%;padding:12px;background:#fff;color:#3c4043;border-radius:10px;font-size:14px;font-weight:600;transition:var(--transition);border:1px solid #dadce0;display:flex;align-items:center;justify-content:center;gap:10px;cursor:pointer;margin-top:10px}
.btn-google:hover{background:#f8f9fa;box-shadow:0 2px 8px rgba(0,0,0,0.1)}
.agreement-check{display:flex;align-items:flex-start;gap:8px;margin-bottom:16px;font-size:13px;color:var(--text-sec);line-height:1.5}
.agreement-check input[type=checkbox]{margin-top:2px;accent-color:var(--accent);width:16px;height:16px;flex-shrink:0;cursor:pointer}
.agreement-check a{color:var(--accent);text-decoration:none;cursor:pointer}
.agreement-check a:hover{text-decoration:underline}
.tos-modal{background:var(--bg-card);border-radius:20px;padding:28px;width:600px;max-width:92vw;max-height:80vh;overflow-y:auto;box-shadow:var(--shadow-lg);transform:scale(0.95);transition:var(--transition)}
.tos-modal h2{font-size:20px;font-weight:700;margin-bottom:16px}
.tos-body{font-size:14px;line-height:1.8;color:var(--text);max-height:55vh;overflow-y:auto;padding-right:8px}
.tos-body h3{font-size:16px;font-weight:700;margin:20px 0 8px;color:var(--text)}
.tos-body p{margin:8px 0}
.tos-body ol{margin:8px 0 8px 20px;padding:0}
.tos-body ol li{margin:4px 0}
.tos-close-btn{display:block;margin:20px auto 0;padding:10px 40px;background:var(--accent);color:#fff;border:none;border-radius:10px;font-size:15px;font-weight:600;cursor:pointer;transition:var(--transition)}
.tos-close-btn:hover{background:var(--accent-hover);transform:translateY(-1px)}
.btn-google svg{width:20px;height:20px}
.divider{display:flex;align-items:center;margin:16px 0;gap:12px}
.divider::before,.divider::after{content:'';flex:1;height:1px;background:var(--beige)}
.divider span{font-size:12px;color:var(--text-muted);white-space:nowrap}
.pwd-hint{font-size:11px;color:var(--text-muted);margin-top:4px;line-height:1.4}
.pwd-hint .check{color:var(--green)}
.pwd-hint .cross{color:var(--red)}
.btn-primary:hover{background:var(--accent-hover);transform:translateY(-1px);box-shadow:0 6px 20px rgba(217,119,87,0.4)}
.btn-primary:disabled{opacity:0.6;cursor:not-allowed;transform:none}
.auth-error{background:rgba(224,85,85,0.08);color:var(--red);padding:10px 14px;border-radius:8px;font-size:13px;margin-bottom:16px;display:none}
.forgot-password-link {
  display: block; text-align: center; margin-top: 12px; font-size: 13px;
  color: var(--accent); cursor: pointer; text-decoration: none;
}
.forgot-password-link:hover { text-decoration: underline; }
.btn-back-login {
  width: 100%; padding: 12px; background: var(--cream); color: var(--text-sec);
  border-radius: 10px; font-size: 14px; font-weight: 600;
  border: 1px solid var(--beige); cursor: pointer; transition: var(--transition);
}
.btn-back-login:hover { background: var(--beige); }

/* ═══════════════ Main Layout — Full Width Chat + Right Drawer ═══════════════ */
#mainApp{display:none;height:100vh;height:100dvh;overflow:hidden;position:relative}

/* ─── Right Drawer (Contacts) ─── */
.right-drawer{position:fixed;top:0;right:0;bottom:0;width:var(--drawer-width);max-width:85vw;background:var(--bg-card);border-left:1px solid var(--beige);z-index:200;display:flex;flex-direction:column;transform:translateX(100%);transition:transform 0.3s cubic-bezier(0.4,0,0.2,1);will-change:transform;box-shadow:var(--shadow-lg)}
.right-drawer.open{transform:translateX(0)}
.drawer-header{padding:16px 16px 12px;border-bottom:1px solid var(--beige);display:flex;align-items:center;justify-content:space-between;flex-shrink:0}
.drawer-header .user-info{display:flex;align-items:center;gap:10px;flex:1;min-width:0}
.drawer-header .avatar{width:40px;height:40px;border-radius:12px;background:linear-gradient(135deg,var(--accent),var(--brown));display:flex;align-items:center;justify-content:center;color:#fff;font-size:16px;font-weight:700;flex-shrink:0;overflow:hidden;cursor:pointer}
.drawer-header .avatar img{width:100%;height:100%;object-fit:cover;border-radius:12px}
.drawer-header .user-name{font-size:15px;font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.drawer-header .user-id{font-size:11px;color:var(--text-muted);font-family:monospace}
.drawer-actions{display:flex;gap:2px;flex-shrink:0}
.drawer-actions button{width:34px;height:34px;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:16px;transition:var(--transition);color:var(--text-sec)}
.drawer-actions button:hover{background:var(--cream);color:var(--accent)}

/* Drawer Tabs: 智能体/好友/群 */
.drawer-tabs{display:flex;border-bottom:1px solid var(--beige);flex-shrink:0}
.drawer-tab{flex:1;padding:10px 4px;text-align:center;font-size:13px;font-weight:600;color:var(--text-muted);border-bottom:2px solid transparent;transition:var(--transition);white-space:nowrap}
.drawer-tab.active{color:var(--accent);border-bottom-color:var(--accent)}
.drawer-tab:hover:not(.active){color:var(--text-sec)}

/* Agent sub-tabs */
.agent-subtabs{display:flex;background:var(--cream);padding:3px;margin:8px 12px;border-radius:8px;border:1px solid var(--beige);flex-shrink:0}
.agent-subtab{flex:1;padding:6px 8px;text-align:center;font-size:12px;font-weight:600;border-radius:6px;transition:var(--transition);color:var(--text-muted)}
.agent-subtab.active{background:var(--bg-card);color:var(--text);box-shadow:var(--shadow-sm)}
.agent-subtab:hover:not(.active){color:var(--text-sec)}

.drawer-search{padding:8px 12px;flex-shrink:0}
.drawer-search input{width:100%;padding:8px 12px 8px 34px;border:1px solid var(--beige);border-radius:10px;font-size:13px;background:var(--bg) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%239B958E' stroke-width='2'%3E%3Ccircle cx='11' cy='11' r='8'/%3E%3Cpath d='m21 21-4.3-4.3'/%3E%3C/svg%3E") 12px center no-repeat;outline:none;transition:var(--transition)}
.drawer-search input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-light)}
.drawer-list{flex:1;overflow-y:auto;padding:4px 8px}
.drawer-panel{display:none;flex-direction:column;flex:1;overflow:hidden}
.drawer-panel.active{display:flex}

/* ─── Chat Area — Full Width ─── */
.chat-area{position:absolute;inset:0;display:flex;flex-direction:column;background:var(--bg);z-index:1;overflow:hidden}
.chat-header{padding:14px 20px;border-bottom:1px solid var(--beige);background:var(--bg-card);display:flex;align-items:center;justify-content:space-between;z-index:5}
.chat-header .chat-info{display:flex;align-items:center;gap:12px}
.chat-header .drawer-toggle{width:38px;height:38px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:20px;transition:var(--transition);color:var(--text-sec);flex-shrink:0}
.chat-header .drawer-toggle:hover{background:var(--cream);color:var(--accent)}
.chat-header .chat-avatar{width:38px;height:38px;border-radius:10px;display:flex;align-items:center;justify-content:center;color:#fff;font-size:15px;font-weight:700}
.chat-header .chat-avatar.fta{font-size:18px;line-height:38px;text-align:center;background:linear-gradient(135deg,#5b9bd5,#2e75b6)!important}
.chat-header .chat-name{font-size:16px;font-weight:700}
.chat-header .chat-status{font-size:12px;color:var(--text-muted)}
.chat-header .chat-actions{display:flex;gap:4px}
.chat-header .chat-actions button{width:36px;height:36px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:18px;transition:var(--transition);color:var(--text-sec)}
.chat-header .chat-actions button:hover{background:var(--cream);color:var(--accent)}

/* ─── Messages ─── */
.chat-messages{flex:1;overflow-y:auto;padding:16px 20px;display:flex;flex-direction:column;gap:4px}
.new-msg-banner{display:flex;align-items:center;gap:10px;padding:10px 14px;background:var(--accent);color:#fff;cursor:pointer;animation:newMsgSlide 0.3s ease;font-size:14px;flex-shrink:0;z-index:210;position:fixed;top:0;left:0;right:0;width:100%;box-shadow:0 4px 16px rgba(217,119,87,0.3)}
.new-msg-banner:hover{filter:brightness(1.08)}
.new-msg-avatar{width:32px;height:32px;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;background:rgba(255,255,255,0.25);flex-shrink:0}
.new-msg-info{flex:1;min-width:0}
.new-msg-name{font-weight:600;font-size:13px}
.new-msg-preview{font-size:12px;opacity:0.85;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:220px}
.new-msg-close{font-size:14px;opacity:0.6;padding:4px 2px;cursor:pointer;flex-shrink:0}
.new-msg-close:hover{opacity:1}
@keyframes newMsgSlide{from{transform:translateY(-100%);opacity:0}to{transform:translateY(0);opacity:1}}
.load-top-sentinel{height:1px;min-height:1px}.load-top-spinner{text-align:center;padding:8px;font-size:13px;color:var(--text-muted)}
.msg-group{display:flex;gap:10px;margin-bottom:8px;max-width:75%}
.msg-group.sent{align-self:flex-end;flex-direction:row-reverse}
.msg-avatar{width:34px;height:34px;border-radius:10px;display:flex;align-items:center;justify-content:center;color:#fff;font-size:12px;font-weight:700;flex-shrink:0}
.msg-content{display:flex;flex-direction:column;gap:2px;min-width:0;flex:0 1 auto;overflow:hidden;max-width:calc(100% - 44px)}
.msg-sender{font-size:12px;color:var(--text-muted);font-weight:600;margin-bottom:2px}
.msg-sender.hidden{display:none}
.msg-bubble{padding:10px 14px;border-radius:14px;font-size:14px;line-height:1.7;position:relative;word-break:break-word;overflow-wrap:break-word;margin-bottom:6px;max-width:100%;overflow:hidden}
.msg-group.received .msg-bubble{background:var(--bg-card);border:1px solid var(--beige);border-top-left-radius:4px}
.msg-group.sent .msg-bubble{background:var(--accent);color:#fff;border-top-right-radius:4px}
.msg-group.sent .msg-bubble a{color:#fff;text-decoration:underline}
.msg-group.received .msg-bubble a{color:var(--accent);text-decoration:underline}
.msg-time{font-size:11px;color:var(--text-muted);margin-top:4px}
.msg-status{font-size:10px;vertical-align:middle;opacity:0.7;cursor:help;margin-left:4px}
.msg-group.sent .msg-time{text-align:right}
.msg-actions{display:none;gap:4px;justify-content:flex-end;margin-top:2px;padding:0 2px}
.msg-group.received .msg-actions{justify-content:flex-start}
.msg-content.show-actions .msg-actions{display:flex}
.msg-actions button{padding:3px 10px;font-size:11px;color:var(--text-muted);background:var(--cream);border:1px solid var(--beige);border-radius:12px;transition:var(--transition);line-height:1.4}
.msg-actions button:hover{background:var(--accent-light);color:var(--accent);border-color:var(--accent)}
/* TTS Read-Aloud Button */
.tts-btn{cursor:pointer;padding:3px 10px!important;font-size:12px!important;line-height:1.4!important;position:relative;transition:all 0.2s ease!important}
.tts-btn:hover{background:var(--amber)!important;color:#fff!important;border-color:var(--amber)!important;transform:scale(1.05)}
.tts-btn.tts-playing{background:var(--accent)!important;color:#fff!important;border-color:var(--accent)!important;animation:tts-pulse 1.5s ease-in-out infinite}
.tts-btn.tts-loading{opacity:0.6;pointer-events:none}
@keyframes tts-pulse{0%,100%{opacity:1}50%{opacity:0.6}}
/* Auto-Read Toggle Button in toolbar */
.auto-read-toggle{font-size:12px;padding:3px 8px;background:var(--cream);border:1px solid var(--beige);border-radius:8px;color:var(--text-muted);cursor:pointer;transition:var(--transition);line-height:1.4;display:inline-flex;align-items:center;gap:2px}
.auto-read-toggle.active{background:var(--amber);color:#fff;border-color:var(--amber)}
.auto-read-toggle:hover{background:var(--amber);color:#fff;border-color:var(--amber)}
.msg-bubble pre{background:rgba(0,0,0,0.05);border-radius:8px;padding:10px 12px;overflow-x:auto;margin:6px 0;font-size:13px}
.msg-group.sent .msg-bubble pre{background:rgba(255,255,255,0.15)}
.msg-bubble code{font-family:'SF Mono','Fira Code','Consolas',monospace;font-size:13px}
.msg-bubble code:not(pre code){background:rgba(0,0,0,0.06);padding:1px 5px;border-radius:4px}
.msg-group.sent .msg-bubble code:not(pre code){background:rgba(255,255,255,0.2)}
.msg-bubble table{border-collapse:collapse;margin:8px 0;width:100%}
.msg-bubble th,.msg-bubble td{border:1px solid var(--beige);padding:6px 10px;text-align:left;font-size:13px}
.msg-bubble th{background:var(--cream);font-weight:600}
.msg-group.sent .msg-bubble th,.msg-group.sent .msg-bubble td{border-color:rgba(255,255,255,0.3)}
.msg-group.sent .msg-bubble th{background:rgba(255,255,255,0.15)}
.msg-bubble blockquote{border-left:3px solid var(--accent);padding-left:12px;margin:6px 0;color:var(--text-sec)}
.msg-group.sent .msg-bubble blockquote{border-left-color:rgba(255,255,255,0.5)}
/* ── MD 通用排版 ── */
.msg-bubble p{margin:4px 0}
.msg-bubble p:first-child{margin-top:0}
.msg-bubble p:last-child{margin-bottom:0}
.msg-bubble h1{font-size:20px;margin:10px 0 6px;font-weight:700}
.msg-bubble h2{font-size:18px;margin:8px 0 5px;font-weight:700}
.msg-bubble h3{font-size:16px;margin:6px 0 4px;font-weight:600}
.msg-bubble h4,.msg-bubble h5,.msg-bubble h6{font-size:14px;margin:5px 0 3px;font-weight:600}
.msg-bubble h1:first-child,.msg-bubble h2:first-child,.msg-bubble h3:first-child{margin-top:0}
.msg-bubble ul,.msg-bubble ol{margin:4px 0;padding-left:24px}
.msg-bubble li{margin:2px 0}
.msg-bubble li>p{margin:2px 0}
.msg-bubble hr{border:none;border-top:1px solid var(--beige);margin:8px 0}
.msg-group.sent .msg-bubble hr{border-top-color:rgba(255,255,255,0.3)}
.msg-bubble img:not(.chat-img){max-width:100%;height:auto;border-radius:6px;margin:4px 0}
.msg-bubble .katex-display{overflow-x:auto;padding:4px 0}
.msg-group.sent .msg-bubble ul,.msg-group.sent .msg-bubble ol{color:rgba(255,255,255,0.95)}
.msg-bubble img.chat-img{max-width:260px;max-height:260px;border-radius:8px;cursor:pointer;display:block}
.msg-bubble .file-card{display:flex;align-items:center;gap:10px;padding:10px 14px;background:rgba(0,0,0,0.04);border-radius:8px;cursor:pointer;transition:var(--transition)}
.msg-group.sent .msg-bubble .file-card{background:rgba(255,255,255,0.12)}
.msg-bubble .file-card:hover{background:rgba(0,0,0,0.08)}
.msg-bubble .file-icon{font-size:28px}
.msg-bubble .file-info{flex:1;min-width:0}
.msg-bubble .file-name{font-size:13px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.msg-bubble .file-size{font-size:11px;color:var(--text-muted)}

/* ─── Collapsible Sections ─── */
.collapsible{margin:6px 0;border-radius:10px;overflow:hidden;border:1px solid var(--beige)}
.msg-group.sent .collapsible{border-color:rgba(255,255,255,0.2)}
.collapsible-header{display:flex;align-items:center;gap:8px;padding:8px 12px;cursor:pointer;font-size:13px;font-weight:600;transition:var(--transition);user-select:none}
.collapsible-header:hover{opacity:0.8}
.collapsible-header .arrow{transition:transform 0.2s;font-size:10px}
.collapsible-header .arrow.open{transform:rotate(90deg)}
.reasoning-section .collapsible-header{background:rgba(139,111,78,0.06);color:var(--brown)}
.msg-group.sent .reasoning-section .collapsible-header{background:rgba(255,255,255,0.1);color:rgba(255,255,255,0.9)}
.tool-section .collapsible-header{background:rgba(91,141,239,0.06);color:var(--blue)}
.msg-group.sent .tool-section .collapsible-header{background:rgba(255,255,255,0.1);color:rgba(255,255,255,0.9)}
.collapsible-body{padding:8px 12px;font-size:13px;display:none;background:rgba(0,0,0,0.02);max-height:400px;overflow-y:auto}
.msg-group.sent .collapsible-body{background:rgba(255,255,255,0.06);color:rgba(255,255,255,0.9)}
.collapsible-body.open{display:block}
.tool-section .tool-name{font-weight:700;margin-bottom:4px}
.tool-section .tool-params{font-family:monospace;font-size:12px;white-space:pre-wrap;background:rgba(0,0,0,0.04);padding:6px 10px;border-radius:6px;margin:4px 0}
.msg-group.sent .tool-section .tool-params{background:rgba(255,255,255,0.1)}
.tool-section .tool-result{margin-top:6px;padding-top:6px;border-top:1px dashed var(--beige)}

/* ─── Input Area ─── */
.chat-input{padding:8px 12px;padding-bottom:max(8px,env(safe-area-inset-bottom));border-top:1px solid var(--beige);background:var(--bg-card);display:flex;flex-direction:column;gap:6px;flex-shrink:0;z-index:10}
.input-toolbar{display:flex;align-items:center;gap:4px;order:-1}
.input-toolbar button{width:34px;height:34px;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:18px;color:var(--text-sec);transition:var(--transition)}
.input-toolbar button:hover{background:var(--cream);color:var(--accent)}
.input-toolbar button.active{background:var(--accent-light);color:var(--accent)}
.input-row{display:flex;gap:8px;align-items:flex-end}
.input-row textarea{flex:1;padding:10px 14px;border:1px solid var(--beige);border-radius:12px;font-size:16px;resize:none;min-height:40px;max-height:160px;outline:none;transition:var(--transition);line-height:1.5;-webkit-appearance:none}
.input-row textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-light)}
.send-btn{width:40px;height:40px;border-radius:10px;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;font-size:18px;transition:var(--transition);flex-shrink:0}
.send-btn:hover{background:var(--accent-hover);transform:scale(1.05)}
.send-btn:disabled{opacity:0.5;cursor:not-allowed;transform:none}
.stop-btn{width:40px;height:40px;border-radius:10px;background:#e74c3c;color:#fff;display:none;align-items:center;justify-content:center;font-size:18px;transition:var(--transition);flex-shrink:0;animation:pulse-stop 1.5s ease-in-out infinite;order:-1}
.stop-btn:hover{background:#c0392b;transform:scale(1.05)}
@keyframes pulse-stop{0%,100%{opacity:1}50%{opacity:0.7}}
/* Voice mode: hide text input & send btn, show hold-to-talk */
.voice-mode .input-row{display:none}
.voice-mode .input-toolbar .voice-toggle-btn{background:var(--accent-light);color:var(--accent)}
.typing-indicator{font-size:12px;color:var(--text-muted);padding:0 4px}

/* ─── Voice Mode: Hold-to-Talk Button ─── */
.voice-hold-btn{display:none;width:100%;height:44px;border-radius:12px;background:var(--cream);border:1px solid var(--beige);font-size:16px;font-weight:600;color:var(--text-sec);cursor:pointer;transition:var(--transition);user-select:none;-webkit-user-select:none;-webkit-touch-callout:none;touch-action:none}
.voice-hold-btn:active,.voice-hold-btn.recording{background:var(--accent-light);color:var(--accent);border-color:var(--accent)}
.voice-mode .voice-hold-btn{display:block}

/* ─── Voice Recording Overlay (WeChat-style) ─── */
.voice-overlay{position:fixed;inset:0;background:rgba(0,0,0,0.5);z-index:350;display:none;flex-direction:column;align-items:center;justify-content:center;gap:16px;-webkit-touch-callout:none;-webkit-user-select:none;user-select:none;touch-action:none}
.voice-overlay.active{display:flex}
.voice-overlay-center{display:flex;flex-direction:column;align-items:center;gap:12px}
.voice-overlay-cancel-zone{position:absolute;bottom:80px;left:0;right:0;display:flex;justify-content:center;gap:20px;align-items:center}
.voice-spectrum-canvas{width:200px;height:100px}
.voice-overlay-timer{font-size:22px;font-weight:700;color:#fff;font-variant-numeric:tabular-nums}
.voice-overlay-hint{font-size:15px;color:rgba(255,255,255,0.8);font-weight:500}
.voice-overlay-cancel-btn{display:flex;align-items:center;gap:6px;padding:10px 24px;border-radius:24px;background:rgba(255,255,255,0.15);color:#fff;font-size:14px;font-weight:600;border:1px solid rgba(255,255,255,0.3);transition:var(--transition);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px)}
.voice-overlay-cancel-btn.drag-active{background:rgba(224,85,85,0.8);border-color:rgba(224,85,85,0.9);transform:scale(1.05)}.call-overlay{position:fixed;inset:0;z-index:200;display:none;flex-direction:column;background:var(--bg);transition:var(--transition)}.call-overlay.open{display:flex}.call-overlay.calling{background:linear-gradient(135deg,#1a1a2e,#16213e)}.call-overlay .call-header{padding:40px 20px 20px;text-align:center;flex-shrink:0}.call-overlay .call-header.video-active{padding:8px 16px;position:absolute;top:0;left:0;right:0;z-index:10;background:linear-gradient(to bottom,rgba(0,0,0,.5),transparent);pointer-events:none}.call-overlay .call-header.video-active .call-avatar{width:32px;height:32px;font-size:14px;margin:0 auto 4px}.call-overlay .call-header.video-active .call-name{font-size:14px}.call-overlay .call-header.video-active .call-status,.call-overlay .call-header.video-active .call-timer{font-size:12px;margin-top:2px}.call-overlay .call-avatar{width:80px;height:80px;border-radius:50%;margin:0 auto 12px;display:flex;align-items:center;justify-content:center;font-size:32px;font-weight:700;color:#fff;overflow:hidden}.call-overlay .call-name{font-size:20px;font-weight:700;color:#fff}.call-overlay .call-status{font-size:14px;color:rgba(255,255,255,.6);margin-top:4px}.call-overlay .call-timer{font-size:16px;color:rgba(255,255,255,.5);margin-top:4px;font-variant-numeric:tabular-nums}.call-overlay .call-videos{flex:1;position:relative;overflow:hidden;min-height:0;background:#000}.call-overlay .call-videos .call-video-full{width:100%;height:100%;object-fit:contain;background:#000;position:absolute;inset:0;z-index:1}.call-overlay .call-videos .call-video-float{position:absolute;z-index:20;width:120px;height:160px;border-radius:12px;overflow:hidden;border:2px solid rgba(255,255,255,.3);box-shadow:0 4px 20px rgba(0,0,0,.5);cursor:grab;touch-action:none;right:12px;top:12px}.call-overlay .call-videos .call-video-float:active{cursor:grabbing}.call-overlay .call-videos .call-video-float-vid{width:100%;height:100%;object-fit:cover;background:#222}.call-overlay .call-videos .call-float-actions{position:absolute;bottom:8px;left:50%;transform:translateX(-50%);display:flex;gap:8px;z-index:21;background:rgba(0,0,0,.6);border-radius:20px;padding:6px 10px;backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px)}.call-overlay .call-videos .call-float-btn{width:32px;height:32px;border-radius:50%;background:rgba(255,255,255,.2);color:#fff;border:none;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:var(--transition)}.call-overlay .call-videos .call-float-btn:hover{background:rgba(255,255,255,.4)}.call-overlay .call-videos .call-split{position:absolute;inset:0;z-index:10;display:flex}.call-overlay .call-videos .call-split.landscape{flex-direction:row}.call-overlay .call-videos .call-split.portrait{flex-direction:column}.call-overlay .call-videos .call-split-pane{flex:1;position:relative;overflow:hidden;background:#000;min-width:0;min-height:0}.call-overlay .call-videos .call-split-vid{width:100%;height:100%;object-fit:contain;background:#000}.call-overlay .call-videos .call-split-maximize{position:absolute;inset:0;background:rgba(0,0,0,.35);display:flex;align-items:center;justify-content:center;cursor:pointer;z-index:2;opacity:0;transition:opacity .2s}.call-overlay .call-videos .call-split-pane:hover .call-split-maximize,.call-overlay .call-videos .call-split-pane:active .call-split-maximize{opacity:1}.call-overlay .call-videos .call-split-maximize svg{color:rgba(255,255,255,.8);filter:drop-shadow(0 2px 8px rgba(0,0,0,.5))}.call-overlay .call-videos .call-split-divider{width:36px;min-height:36px;display:flex;align-items:center;justify-content:center;flex-shrink:0;z-index:3;background:rgba(255,255,255,.08)}.call-overlay .call-videos .call-split.landscape .call-split-divider{width:36px;min-height:0}.call-overlay .call-videos .call-split.portrait .call-split-divider{height:36px;min-width:0;width:auto}.call-overlay .call-videos .call-swap-btn{width:32px;height:32px;border-radius:50%;background:rgba(255,255,255,.2);color:rgba(255,255,255,.8);border:none;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:var(--transition);backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px)}.call-overlay .call-videos .call-swap-btn:hover{background:rgba(255,255,255,.4);transform:scale(1.1)}.call-overlay .call-videos .call-maximize-overlay{position:absolute;inset:0;z-index:5;display:flex;align-items:center;justify-content:center;background:rgba(0,0,0,.3);cursor:pointer;transition:opacity .2s}.call-overlay .call-videos .call-maximize-overlay svg{color:rgba(255,255,255,.8);filter:drop-shadow(0 2px 8px rgba(0,0,0,.5))}.call-overlay .call-no-video{flex:1;display:flex;align-items:center;justify-content:center;color:rgba(255,255,255,.3);font-size:48px}.call-overlay .call-controls{padding:20px 20px 40px;display:flex;align-items:center;justify-content:center;gap:16px;flex-shrink:0;z-index:30}.call-btn{width:56px;height:56px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:22px;cursor:pointer;border:none;transition:var(--transition);color:#fff}.call-btn:hover{transform:scale(1.08)}.call-btn.call-btn-mic{background:rgba(255,255,255,.15)}.call-btn.call-btn-mic.off{background:rgba(231,76,60,.8)}.call-btn.call-btn-cam{background:rgba(255,255,255,.15)}.call-btn.call-btn-cam.off{background:rgba(231,76,60,.8)}.call-btn.call-btn-switch{background:rgba(255,255,255,.15)}.call-btn.call-btn-hangup{background:#e74c3c;width:64px;height:64px;font-size:26px}.call-btn.call-btn-hangup:hover{background:#c0392b}.call-btn.call-btn-accept{background:#27ae60;width:64px;height:64px;font-size:26px}.call-btn.call-btn-accept:hover{background:#219a52}.call-btn.call-btn-reject{background:#e74c3c;width:64px;height:64px;font-size:26px}.call-btn.call-btn-reject:hover{background:#c0392b}.call-overlay .incoming-actions{display:flex;gap:24px;justify-content:center;padding:20px 20px 40px}
/* ─── Group Call Overlay ─── */
.group-call-overlay{position:fixed;inset:0;z-index:210;display:none;flex-direction:column;background:linear-gradient(135deg,#1a1a2e,#16213e);transition:var(--transition)}.group-call-overlay.open{display:flex}.group-call-overlay .gc-header{padding:40px 20px 16px;text-align:center;flex-shrink:0;z-index:10}.group-call-overlay .gc-header.video-active{padding:8px 16px;position:absolute;top:0;left:0;right:0;background:linear-gradient(to bottom,rgba(0,0,0,.6),transparent);pointer-events:none}.group-call-overlay .gc-name{font-size:18px;font-weight:700;color:#fff}.group-call-overlay .gc-status{font-size:13px;color:rgba(255,255,255,.6);margin-top:4px}.group-call-overlay .gc-timer{font-size:15px;color:rgba(255,255,255,.5);margin-top:2px;font-variant-numeric:tabular-nums}.group-call-overlay .gc-participants{font-size:12px;color:rgba(255,255,255,.4);margin-top:4px}.group-call-overlay .gc-grid{flex:1;overflow-y:auto;padding:8px;display:grid;gap:8px;align-content:start}.group-call-overlay .gc-grid.grid-1{grid-template-columns:1fr}.group-call-overlay .gc-grid.grid-2{grid-template-columns:1fr 1fr}.group-call-overlay .gc-grid.grid-3{grid-template-columns:1fr 1fr}.group-call-overlay .gc-grid.grid-4{grid-template-columns:1fr 1fr}.gc-tile{position:relative;background:#111;border-radius:12px;overflow:hidden;display:flex;align-items:center;justify-content:center;min-height:140px}.gc-tile video{width:100%;height:100%;object-fit:cover;position:absolute;inset:0}.gc-tile .gc-tile-avatar{width:56px;height:56px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:22px;font-weight:700;color:#fff;flex-shrink:0}.gc-tile .gc-tile-name{position:absolute;bottom:8px;left:8px;font-size:12px;color:#fff;background:rgba(0,0,0,.5);padding:2px 8px;border-radius:8px;z-index:2;max-width:calc(100% - 16px);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.gc-tile .gc-tile-muted{position:absolute;top:8px;right:8px;font-size:14px;z-index:2}.gc-tile .gc-no-video{color:rgba(255,255,255,.3);font-size:36px}.group-call-overlay .gc-controls{padding:20px 20px 40px;display:flex;align-items:center;justify-content:center;gap:16px;flex-shrink:0;z-index:30}
.voice-overlay-send-btn{display:flex;align-items:center;gap:6px;padding:10px 24px;border-radius:24px;background:var(--accent);color:#fff;font-size:14px;font-weight:600;border:none;transition:var(--transition)}
.voice-overlay-cancel-icon{font-size:18px}

/* ─── Voice Message Bubble ─── */
.voice-bubble{display:flex;align-items:center;gap:8px;padding:4px 0;min-width:160px;max-width:240px;cursor:pointer}
.voice-play-btn{width:36px;height:36px;border-radius:50%;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:var(--transition);border:none;cursor:pointer;font-size:16px}
.voice-play-btn:hover{transform:scale(1.08)}
.voice-play-btn.playing{background:#e74c3c}
.msg-group.sent .voice-play-btn{background:rgba(255,255,255,0.25)}
.msg-group.sent .voice-play-btn.playing{background:rgba(255,255,255,0.4)}
.voice-wave-track{flex:1;height:24px;position:relative;border-radius:4px;overflow:hidden}
.voice-wave-bg{position:absolute;inset:0;background:var(--cream);border-radius:4px}
.msg-group.sent .voice-wave-bg{background:rgba(255,255,255,0.2)}
.voice-wave-progress{position:absolute;left:0;top:0;bottom:0;background:var(--accent-light);border-radius:4px;transition:width .1s linear}
.msg-group.sent .voice-wave-progress{background:rgba(255,255,255,0.2)}
.voice-dur{font-size:12px;color:var(--text-muted);flex-shrink:0;min-width:32px;text-align:right}
.msg-group.sent .voice-dur{color:rgba(255,255,255,0.8)}
.voice-sending-spinner{display:inline-block}
.msg-group.sent .voice-sending-spinner{border-color:rgba(255,255,255,0.3)!important;border-top-color:rgba(255,255,255,0.9)!important}
/* Revoked message */
.msg-revoked{font-size:13px;color:var(--text-muted);font-style:italic;padding:4px 0}

/* ─── System Messages (join/leave notifications) ─── */
.msg-system{text-align:center;padding:6px 16px;margin:4px 0}
.msg-system-text{font-size:12px;color:var(--text-muted);background:var(--cream);padding:3px 12px;border-radius:10px;display:inline-block}
.msg-system-time{font-size:10px;color:var(--text-muted);margin-left:6px;opacity:.6}

/* ─── Call Record ─── */
.msg-call-record{text-align:center;padding:8px 16px;margin:4px 0;display:flex;align-items:center;justify-content:center;gap:6px}
.msg-call-record .call-record-icon{font-size:16px;flex-shrink:0}
.msg-call-record .call-record-info{display:inline-flex;flex-direction:column;align-items:center;gap:1px;background:var(--cream);padding:4px 14px;border-radius:10px}
.msg-call-record .call-record-direction{font-size:12px;color:var(--text-secondary)}
.msg-call-record .call-record-status{font-size:11px;font-weight:500}
.msg-call-record .msg-system-time{font-size:10px;color:var(--text-muted);opacity:.6;flex-shrink:0}

/* ─── Streaming ─── */
.chat-streaming{min-height:1em}
.chat-streaming::after{content:'▊';animation:blink .8s steps(2) infinite;color:var(--accent);font-size:.9em}
@keyframes blink{0%,100%{opacity:1}50%{opacity:0}}
.chat-typing{align-self:flex-start;padding:8px 12px;background:var(--bg-card);border-radius:var(--radius);color:var(--text-muted);font-size:13px}
.chat-typing::after{content:'...';animation:typing 1s infinite}
@keyframes typing{0%,20%{content:'.'}40%{content:'..'}60%,100%{content:'...'}}
.msg-group.streaming .msg-bubble{border-left:2px solid var(--accent)}
.tool-progress{border-left:2px solid var(--accent)}
.tool-spinner{animation:spin 1s linear infinite;font-size:14px}
@keyframes spin{from{transform:rotate(0deg)}to{transform:rotate(360deg)}}
.tool-status.tool-ok{color:var(--green)}
.tool-status.tool-fail{color:var(--red)}
.tool-status.tool-err{color:var(--red)}
.tool-name{font-weight:600;font-size:12px;margin-bottom:4px}
.tool-params{font-family:'SF Mono','Fira Code','Consolas',monospace;font-size:11px;color:var(--text-sec);background:rgba(0,0,0,0.03);padding:6px 8px;border-radius:6px;white-space:pre-wrap;word-break:break-word;overflow-wrap:break-word;max-width:100%;overflow:hidden}
.tool-result{font-size:12px;margin-top:6px;padding:6px 8px;border-radius:6px;background:rgba(0,0,0,0.02);word-break:break-word;overflow-wrap:break-word;max-width:100%}
.reasoning-header{display:flex;align-items:center;gap:6px;padding:4px 6px;cursor:pointer;border-radius:6px;user-select:none;-webkit-user-select:none;transition:background .15s}
.reasoning-header:hover{background:rgba(0,0,0,0.04)}
.reasoning-icon{font-size:13px;flex-shrink:0}
.reasoning-title{font-size:11px;color:var(--text-muted);flex:1}
.reasoning-toggle{font-size:11px;color:var(--text-muted);flex-shrink:0;width:14px;text-align:center}
.reasoning-body-open,.reasoning-section .collapsible-body.open{padding:6px 8px 6px 24px;font-family:monospace;font-size:11px;color:var(--text-sec);line-height:1.5;white-space:pre-wrap;word-break:break-word;max-height:400px;overflow-y:auto;-webkit-overflow-scrolling:touch}

/* ─── Empty State ─── */
.empty-state{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;color:var(--text-muted);gap:12px}
.empty-state .icon{font-size:64px;opacity:0.3}
.empty-state h3{font-size:18px;font-weight:600;color:var(--text-sec)}
.empty-state p{font-size:14px}

/* ─── List Items (shared) ─── */
.list-item{display:flex;align-items:center;gap:12px;padding:10px 12px;border-radius:10px;cursor:pointer;transition:var(--transition);position:relative}
.list-item:hover{background:var(--cream)}
.list-item.active{background:var(--accent-light)}
.list-item .item-avatar{width:42px;height:42px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:16px;font-weight:700;color:#fff;flex-shrink:0;position:relative;overflow:hidden}
.list-item .item-avatar img{width:100%;height:100%;object-fit:cover;border-radius:12px}
.list-item .item-avatar.human{background:linear-gradient(135deg,var(--accent),var(--brown))}
.list-item .item-avatar.ai{background:linear-gradient(135deg,var(--amber),var(--brown))}
.list-item .item-avatar.group{background:linear-gradient(135deg,var(--green),#2E8B57)}
.list-item .online-dot{position:absolute;bottom:-1px;right:-1px;width:12px;height:12px;border-radius:50%;background:var(--green);border:2px solid var(--bg-card)}
.list-item .offline-dot{position:absolute;bottom:-1px;right:-1px;width:12px;height:12px;border-radius:50%;background:var(--text-muted);border:2px solid var(--bg-card)}
.list-item .item-info{flex:1;min-width:0}
.list-item .item-name{font-size:14px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;display:flex;align-items:center;gap:6px}
.list-item .type-badge{font-size:10px;padding:1px 6px;border-radius:4px;font-weight:600}
.list-item .type-badge.human{background:var(--accent-light);color:var(--accent)}
.list-item .type-badge.ai{background:rgba(229,165,75,0.12);color:var(--amber)}
.list-item .item-last{font-size:12px;color:var(--text-muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-top:2px}
.list-item .item-meta{display:flex;flex-direction:column;align-items:flex-end;gap:4px}
.list-item .item-time{font-size:11px;color:var(--text-muted)}
.list-item .unread-badge{min-width:18px;height:18px;border-radius:9px;background:var(--red);color:#fff;font-size:11px;font-weight:600;display:flex;align-items:center;justify-content:center;padding:0 5px}
.list-item .silent-icon{color:var(--text-muted);font-size:14px}
.list-item .pin-icon{font-size:10px;opacity:0.6;margin-left:2px}
.list-item.pinned{background:var(--accent-light)}
.list-item .item-avatar.fta{font-size:20px;line-height:42px;text-align:center;background:linear-gradient(135deg,#5b9bd5,#2e75b6)!important}
.section-label{font-size:11px;font-weight:700;color:var(--text-muted);padding:8px 12px 4px;text-transform:uppercase;letter-spacing:0.5px}

/* ─── Modals ─── */
.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,0.4);z-index:300;display:flex;align-items:center;justify-content:center;opacity:0;visibility:hidden;transition:var(--transition)}
.modal-overlay.open{opacity:1;visibility:visible}
.modal{background:var(--bg-card);border-radius:20px;padding:28px;width:440px;max-width:90vw;max-height:85vh;overflow-y:auto;box-shadow:var(--shadow-lg);transform:scale(0.95);transition:var(--transition)}
.modal-overlay.open .modal{transform:scale(1)}
.modal h2{font-size:18px;font-weight:700;margin-bottom:20px}
.modal .form-group{margin-bottom:14px}
.modal .btn-row{display:flex;gap:8px;justify-content:flex-end;margin-top:20px}
.modal .btn-secondary{padding:8px 20px;border:1px solid var(--beige);border-radius:10px;font-size:14px;font-weight:600;color:var(--text-sec);transition:var(--transition)}
.modal .btn-secondary:hover{background:var(--cream)}
.modal .btn-action{padding:8px 20px;background:var(--accent);color:#fff;border-radius:10px;font-size:14px;font-weight:600;transition:var(--transition)}
.modal .btn-action:hover{background:var(--accent-hover)}

/* ─── Friend Requests ─── */
.request-item{display:flex;align-items:center;gap:12px;padding:10px;border-radius:10px;border:1px solid var(--beige);margin-bottom:8px}
.request-item .req-info{flex:1}
.request-item .req-name{font-size:14px;font-weight:600}
.request-item .req-msg{font-size:12px;color:var(--text-muted);margin-top:2px}
.request-item .req-actions{display:flex;gap:6px}
.request-item .req-actions button{padding:5px 12px;border-radius:8px;font-size:12px;font-weight:600;transition:var(--transition)}
.request-item .btn-accept{background:var(--accent);color:#fff}
.request-item .btn-accept:hover{background:var(--accent-hover)}
.request-item .btn-reject{border:1px solid var(--beige);color:var(--text-sec)}
.request-item .btn-reject:hover{background:var(--cream)}
.req-badge{position:absolute;top:-4px;right:-4px;min-width:16px;height:16px;border-radius:8px;background:var(--red);color:#fff;font-size:10px;font-weight:700;display:flex;align-items:center;justify-content:center;padding:0 4px;pointer-events:none;box-shadow:0 1px 4px rgba(224,85,85,0.4);z-index:1}

/* ─── Settings Panel ─── */
.settings-panel{padding:20px}
.settings-panel .section{margin-bottom:24px}
.settings-panel .section h3{font-size:15px;font-weight:700;margin-bottom:12px;color:var(--accent)}
.settings-panel .field{display:flex;align-items:center;justify-content:space-between;padding:10px 0;border-bottom:1px solid var(--beige)}
.settings-panel .field-label{font-size:14px;color:var(--text-sec)}
.settings-panel .field-value{font-size:14px;font-weight:600}
.settings-panel .field-value.mono{font-family:monospace}
.qr-display{width:220px;height:220px;background:var(--bg);border:1px solid var(--beige);border-radius:12px;display:flex;align-items:center;justify-content:center;margin:12px auto;color:var(--text-muted);font-size:13px}
.key-display{font-family:monospace;font-size:11px;background:var(--bg);padding:10px;border-radius:8px;word-break:break-all;max-height:80px;overflow-y:auto;border:1px solid var(--beige)}
.btn-outline{padding:6px 14px;border:1px solid var(--beige);border-radius:8px;font-size:12px;font-weight:600;color:var(--text-sec);transition:var(--transition)}
.btn-outline:hover{background:var(--cream);color:var(--accent)}

/* ─── Mention Dropdown ─── */
.mention-dropdown{position:absolute;bottom:100%;left:0;background:var(--bg-card);border:1px solid var(--beige);border-radius:10px;box-shadow:var(--shadow-md);max-height:200px;overflow-y:auto;z-index:20;display:none;width:220px}
.mention-dropdown.open{display:block}
.mention-item{display:flex;align-items:center;gap:8px;padding:8px 12px;cursor:pointer;transition:var(--transition);font-size:13px}
.mention-item:hover{background:var(--cream)}
.mention-item .m-avatar{width:24px;height:24px;border-radius:6px;display:flex;align-items:center;justify-content:center;color:#fff;font-size:10px;font-weight:700}

/* ─── Lightbox ─── */
.lightbox{position:fixed;inset:0;background:rgba(0,0,0,0.85);z-index:400;display:flex;align-items:center;justify-content:center;cursor:pointer;opacity:0;visibility:hidden;transition:var(--transition)}
.lightbox.open{opacity:1;visibility:visible}
.lightbox img{max-width:90vw;max-height:90vh;border-radius:8px;object-fit:contain}

/* ─── Toast ─── */
.toast-container{position:fixed;top:20px;right:20px;z-index:500;display:flex;flex-direction:column;gap:8px}
.toast{padding:12px 20px;border-radius:10px;font-size:14px;font-weight:500;box-shadow:var(--shadow-md);animation:slideIn 0.3s ease;max-width:320px}
.toast.success{background:var(--green);color:#fff}
.toast.error{background:var(--red);color:#fff}
.toast.info{background:var(--blue);color:#fff}
.toast.toast-avatar{display:flex;align-items:center;padding:10px 16px}
.toast.warning{background:#f59e0b;color:#fff}
@keyframes slideIn{from{transform:translateX(100%);opacity:0}to{transform:translateX(0);opacity:1}}

/* ─── Upload preview ─── */
.upload-preview{padding:8px 0;display:flex;gap:8px;flex-wrap:wrap}
.upload-preview:empty{padding:0}
.upload-preview img{width:60px;height:60px;object-fit:cover;border-radius:8px;border:1px solid var(--beige)}
.upload-item{position:relative;display:inline-block}
.upload-item .upload-remove{position:absolute;top:-6px;right:-6px;width:20px;height:20px;border-radius:50%;background:var(--red);color:#fff;font-size:12px;display:flex;align-items:center;justify-content:center;cursor:pointer;z-index:2;opacity:0.5;transition:opacity 0.2s;line-height:1;border:none;padding:0}
.upload-item:hover .upload-remove,.upload-item .upload-remove:focus{opacity:1}
.upload-item.uploading::after{content:'';position:absolute;inset:0;background:rgba(255,255,255,0.6);border-radius:8px}
.upload-item.upload-failed{opacity:0.6}
.upload-item.upload-failed::after{content:'';position:absolute;inset:0;background:rgba(224,85,85,0.15);border-radius:8px}
.upload-spinner{display:none;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:20px;height:20px;border:2px solid var(--beige);border-top-color:var(--accent);border-radius:50%;animation:spin .6s linear infinite}
.upload-item.uploading .upload-spinner{display:block}
.upload-item .upload-error-icon{display:none;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);font-size:20px;z-index:1}
.upload-item.upload-failed .upload-error-icon{display:block}
.upload-item.upload-failed .upload-spinner{display:none}
/* Upload progress bar (replaces spinner for image/file uploads) */
.upload-progress-bar{display:none;position:absolute;bottom:0;left:0;right:0;height:22px;background:rgba(0,0,0,0.5);border-radius:0 0 8px 8px;overflow:hidden;z-index:2}
.upload-item.uploading .upload-progress-bar{display:flex;align-items:center}
.upload-progress-fill{height:100%;background:var(--accent);transition:width 0.2s ease;border-radius:0 0 0 8px}
.upload-progress-text{position:absolute;left:0;right:0;text-align:center;color:#fff;font-size:10px;font-weight:600;line-height:22px;text-shadow:0 1px 2px rgba(0,0,0,0.5)}
/* Upload progress in chat bubble */
.upload-bubble{position:relative;display:inline-block;max-width:100%}
.upload-bubble-progress{position:absolute;bottom:0;left:0;right:0;height:24px;background:rgba(0,0,0,0.55);border-radius:0 0 12px 12px;overflow:hidden;display:flex;align-items:center}
.upload-bubble-fill{height:100%;background:var(--accent);transition:width .2s ease;border-radius:0 0 0 12px}
.upload-bubble-text{position:absolute;left:0;right:0;text-align:center;color:#fff;font-size:11px;font-weight:600;line-height:24px;text-shadow:0 1px 2px rgba(0,0,0,0.5)}
.upload-bubble-failed .upload-bubble-overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(0,0,0,0.5);border-radius:12px;color:#fff;font-size:12px;padding:8px;text-align:center}
.file-card.uploading{opacity:.7;pointer-events:none}
.file-card.upload-failed{border-color:var(--red);opacity:.7}
@keyframes spin{to{transform:translate(-50%,-50%) rotate(360deg)}}

/* ─── Profile Card Modal ─── */
.profile-card{text-align:center;padding:20px}
.profile-card .pc-avatar{width:80px;height:80px;border-radius:20px;margin:0 auto 12px;display:flex;align-items:center;justify-content:center;font-size:32px;font-weight:700;color:#fff;overflow:hidden}
.profile-card .pc-avatar img{width:100%;height:100%;object-fit:cover;border-radius:20px}
.profile-card .pc-name{font-size:18px;font-weight:700;margin-bottom:4px}
.profile-card .pc-id{font-size:12px;color:var(--text-muted);font-family:monospace;margin-bottom:16px}
.profile-card .pc-actions{display:flex;flex-direction:column;gap:8px;margin-top:8px}
.profile-card .pc-btn{width:100%;padding:10px;border-radius:10px;font-size:14px;font-weight:600;transition:var(--transition);cursor:pointer;border:1px solid var(--red);color:var(--red);background:var(--red-light)}
.profile-card .pc-btn:hover{background:var(--red);color:#fff}
.profile-card .pc-btn.toggle-btn{display:flex;align-items:center;justify-content:space-between;border-color:var(--beige);color:var(--text-sec);background:var(--bg)}
.profile-card .pc-btn.toggle-btn:hover{background:var(--cream)}
.profile-card .pc-btn.toggle-btn.active{border-color:var(--red);color:var(--red);background:var(--red-light)}
/* Toggle Switch */
.toggle-switch{position:relative;width:44px;height:24px;flex-shrink:0}
.toggle-switch input{opacity:0;width:0;height:0}
.toggle-switch .slider{position:absolute;inset:0;background:var(--beige);border-radius:12px;transition:var(--transition);cursor:pointer}
.toggle-switch .slider::before{content:'';position:absolute;left:3px;top:3px;width:18px;height:18px;border-radius:50%;background:#fff;transition:var(--transition);box-shadow:0 1px 3px rgba(0,0,0,0.15)}
.toggle-switch input:checked+.slider{background:var(--red)}
.toggle-switch input:checked+.slider::before{transform:translateX(20px)}

/* ─── Bookmark Panel (Bottom Sheet) ─── */
.bookmark-panel{position:fixed;bottom:0;left:0;right:0;background:var(--bg-card);border-top-left-radius:20px;border-top-right-radius:20px;box-shadow:0 -4px 24px rgba(0,0,0,0.15);z-index:310;transform:translateY(100%);transition:transform 0.3s cubic-bezier(0.4,0,0.2,1);max-height:60vh;display:flex;flex-direction:column}
.bookmark-panel.open{transform:translateY(0)}
.bookmark-panel .bp-header{padding:16px 20px 12px;border-bottom:1px solid var(--beige);display:flex;align-items:center;justify-content:space-between;flex-shrink:0}
.bookmark-panel .bp-header h3{font-size:16px;font-weight:700}
.bookmark-panel .bp-close{width:32px;height:32px;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:18px;color:var(--text-sec);transition:var(--transition)}
.bookmark-panel .bp-close:hover{background:var(--cream);color:var(--accent)}
.bookmark-panel .bp-search{padding:8px 12px;flex-shrink:0}
.bookmark-panel .bp-search input{width:100%;padding:8px 12px;border:1px solid var(--beige);border-radius:10px;font-size:13px;background:var(--bg);outline:none;transition:var(--transition)}
.bookmark-panel .bp-search input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-light)}
.bookmark-panel .bp-list{flex:1;overflow-y:auto;padding:4px 12px}
.bookmark-panel .bp-footer{padding:8px 20px 12px;text-align:center;font-size:11px;color:var(--text-muted);flex-shrink:0}
.bm-item{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:10px;cursor:pointer;transition:var(--transition);border:1px solid var(--beige);margin-bottom:6px}
.bm-item:hover{background:var(--cream)}
.bm-item .bm-info{flex:1;min-width:0;cursor:pointer}
.bm-item .bm-title{font-size:14px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.bm-item .bm-date{font-size:11px;color:var(--text-muted);margin-top:2px}
.bm-item .bm-actions{display:flex;gap:4px;flex-shrink:0}
.bm-item .bm-actions button{width:28px;height:28px;border-radius:6px;display:flex;align-items:center;justify-content:center;font-size:13px;transition:var(--transition);color:var(--text-sec)}
.bm-item .bm-actions button:hover{background:var(--cream);color:var(--accent)}
.bm-item .bm-actions button.bm-del:hover{color:var(--red);background:var(--red-light)}

/* ─── Bookmark Detail Panel ─── */
.bookmark-detail-panel{position:fixed;bottom:0;left:0;right:0;background:var(--bg-card);border-top-left-radius:20px;border-top-right-radius:20px;box-shadow:0 -4px 24px rgba(0,0,0,0.15);z-index:320;transform:translateY(100%);transition:transform 0.3s cubic-bezier(0.4,0,0.2,1);max-height:70vh;display:flex;flex-direction:column}
.bookmark-detail-panel.open{transform:translateY(0)}
.bookmark-detail-panel .bd-header{padding:16px 20px 12px;border-bottom:1px solid var(--beige);display:flex;align-items:center;justify-content:space-between;flex-shrink:0}
.bookmark-detail-panel .bd-header h3{font-size:16px;font-weight:700}
.bookmark-detail-panel .bd-close{width:32px;height:32px;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:18px;color:var(--text-sec);transition:var(--transition)}
.bookmark-detail-panel .bd-close:hover{background:var(--cream);color:var(--accent)}
.bookmark-detail-panel .bd-body{flex:1;overflow-y:auto;padding:16px 20px}
.bookmark-detail-panel .bd-title{font-size:16px;font-weight:700;margin-bottom:8px}
.bookmark-detail-panel .bd-content{font-size:14px;line-height:1.7;white-space:pre-wrap;word-break:break-word;color:var(--text-sec)}
.bookmark-detail-panel .bd-footer{padding:12px 20px;border-top:1px solid var(--beige);display:flex;gap:8px;flex-shrink:0}
.bookmark-detail-panel .bd-footer button{flex:1;padding:10px;border-radius:10px;font-size:14px;font-weight:600;transition:var(--transition);cursor:pointer}
.bookmark-detail-panel .bd-copy-sel{border:1px solid var(--beige);color:var(--text-sec);background:var(--bg)}
.bookmark-detail-panel .bd-copy-sel:hover{background:var(--cream);color:var(--accent)}
.bookmark-detail-panel .bd-copy-all{background:var(--accent);color:#fff;border:none}
.bookmark-detail-panel .bd-copy-all:hover{background:var(--accent-hover)}

/* ─── Bookmark Title/Edit Dialog ─── */
.bm-dialog-overlay{position:fixed;inset:0;background:rgba(0,0,0,0.4);z-index:330;display:flex;align-items:center;justify-content:center;opacity:0;visibility:hidden;transition:var(--transition)}
.bm-dialog-overlay.open{opacity:1;visibility:visible}
.bm-dialog{background:var(--bg-card);border-radius:16px;padding:24px;width:360px;max-width:90vw;box-shadow:var(--shadow-lg);transform:scale(0.95);transition:var(--transition)}
.bm-dialog-overlay.open .bm-dialog{transform:scale(1)}
.bm-dialog h3{font-size:16px;font-weight:700;margin-bottom:16px}
.bm-dialog .form-group{margin-bottom:12px}
.bm-dialog .form-group label{display:block;font-size:13px;font-weight:600;color:var(--text-sec);margin-bottom:4px}
.bm-dialog .form-group input,.bm-dialog .form-group textarea{width:100%;padding:8px 12px;border:1px solid var(--beige);border-radius:8px;font-size:14px;outline:none;transition:var(--transition);background:var(--bg)}
.bm-dialog .form-group input:focus,.bm-dialog .form-group textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-light)}
.bm-dialog .form-group textarea{resize:vertical;min-height:80px}
.bm-dialog .btn-row{display:flex;gap:8px;justify-content:flex-end;margin-top:16px}

/* ─── Context Menu ─── */
.context-menu{position:fixed;background:var(--bg-card);border:1px solid var(--beige);border-radius:10px;box-shadow:var(--shadow-md);z-index:250;overflow:hidden;display:none;min-width:140px}
.context-menu.open{display:block}
.context-menu button{display:flex;align-items:center;gap:8px;width:100%;padding:10px 16px;font-size:13px;color:var(--text-sec);transition:var(--transition);text-align:left}
.context-menu button:hover{background:var(--cream);color:var(--text)}
.context-menu button.danger:hover{color:var(--red)}

/* ─── Multi-Select Mode ─── */
.multi-select-bar{position:fixed;bottom:0;left:0;right:0;background:var(--bg-card);border-top:1px solid var(--beige);padding:12px 20px;display:none;align-items:center;justify-content:space-between;z-index:200;box-shadow:0 -2px 10px rgba(0,0,0,0.1)}
.multi-select-bar.open{display:flex}
.multi-select-bar .ms-info{font-size:14px;color:var(--text-sec)}
.multi-select-bar .ms-info strong{color:var(--accent);font-size:16px}
.multi-select-bar .ms-actions{display:flex;gap:10px}
.multi-select-bar .ms-actions button{padding:8px 18px;border-radius:8px;font-size:13px;font-weight:600;cursor:pointer;transition:var(--transition);border:none}
.ms-btn-forward{background:var(--accent);color:#fff}
.ms-btn-forward:hover{opacity:0.85}
.ms-btn-delete{background:transparent;color:var(--red);border:1px solid var(--red)!important}
.ms-btn-delete:hover{background:var(--red);color:#fff}
.ms-btn-cancel{background:transparent;color:var(--text-sec);border:1px solid var(--beige)!important}
.ms-btn-cancel:hover{background:var(--cream)}

.msg-group.multi-selectable{cursor:pointer;position:relative}
.msg-group.multi-selectable::before{content:'';position:absolute;left:-32px;top:50%;transform:translateY(-50%);width:22px;height:22px;border:2px solid var(--beige);border-radius:50%;background:var(--bg-card);transition:var(--transition);z-index:5}
.msg-group.multi-selectable.checked::before{background:var(--accent);border-color:var(--accent)}
.msg-group.multi-selectable.checked::after{content:'✓';position:absolute;left:-32px;top:50%;transform:translateY(-50%);width:22px;height:22px;display:flex;align-items:center;justify-content:center;color:#fff;font-size:12px;font-weight:700;z-index:6;pointer-events:none}
.chat-messages.multi-select-mode .msg-group{margin-left:32px}
.chat-messages.multi-select-mode .msg-group.sent{margin-left:0;margin-right:32px}

/* ─── Forward Modal ─── */
.forward-modal-body{max-height:50vh;overflow-y:auto;padding:8px 0}
.forward-contact{display:flex;align-items:center;gap:10px;padding:10px 16px;cursor:pointer;transition:var(--transition);border-radius:8px;margin:2px 8px}
.forward-contact:hover{background:var(--cream)}
.forward-contact.selected{background:var(--accent);color:#fff}
.forward-contact .fc-avatar{width:36px;height:36px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:700;flex-shrink:0}
.forward-contact .fc-name{font-size:14px;font-weight:500}
.forward-section-title{font-size:12px;color:var(--text-muted);padding:8px 16px 4px;font-weight:600;text-transform:uppercase;letter-spacing:0.5px}
.forward-msg-preview{font-size:12px;color:var(--text-muted);padding:8px 16px;border-bottom:1px solid var(--beige);margin-bottom:4px;max-height:80px;overflow-y:auto}

/* Forward Mode Tabs */
.forward-mode-tabs{display:flex;background:var(--cream);padding:3px;margin:0 0 12px;border-radius:8px;border:1px solid var(--beige)}
.forward-mode-tab{flex:1;padding:8px 4px;text-align:center;font-size:13px;font-weight:600;border-radius:6px;transition:var(--transition);color:var(--text-muted);cursor:pointer}
.forward-mode-tab.active{background:var(--bg-card);color:var(--text);box-shadow:var(--shadow-sm)}
.forward-mode-tab:hover:not(.active){color:var(--text-sec)}
.forward-mode-desc{font-size:11px;color:var(--text-muted);text-align:center;margin-bottom:10px;line-height:1.5}

/* Merged Forward Card */
.merged-forward-card{background:var(--bg);border:1px solid var(--beige);border-radius:10px;padding:10px 12px;cursor:pointer;transition:var(--transition);margin:4px 0}
.merged-forward-card:hover{border-color:var(--accent);box-shadow:0 0 0 2px var(--accent-light)}
.merged-forward-header{display:flex;align-items:center;gap:6px;margin-bottom:6px;padding-bottom:6px;border-bottom:1px solid var(--beige)}
.merged-forward-header .mf-icon{font-size:14px;color:var(--accent)}
.merged-forward-header .mf-title{font-size:12px;font-weight:600;color:var(--accent)}
.merged-forward-header .mf-count{font-size:11px;color:var(--text-muted);margin-left:auto}
.merged-forward-item{padding:4px 0;font-size:13px;line-height:1.5}
.merged-forward-item .mf-sender{font-weight:600;color:var(--text-sec);margin-right:4px}
.merged-forward-item .mf-text{color:var(--text)}
.merged-forward-footer{font-size:11px;color:var(--text-muted);margin-top:6px;padding-top:6px;border-top:1px solid var(--beige)}
.msg-group.sent .merged-forward-card{background:rgba(255,255,255,0.1);border-color:rgba(255,255,255,0.25)}
.msg-group.sent .merged-forward-header{border-bottom-color:rgba(255,255,255,0.2)}
.msg-group.sent .merged-forward-item .mf-sender{color:rgba(255,255,255,0.85)}
.msg-group.sent .merged-forward-item .mf-text{color:rgba(255,255,255,0.95)}
.msg-group.sent .merged-forward-footer{border-top-color:rgba(255,255,255,0.2);color:rgba(255,255,255,0.7)}
.msg-group.sent .merged-forward-header .mf-title{color:rgba(255,255,255,0.9)}
.msg-group.sent .merged-forward-header .mf-icon{color:rgba(255,255,255,0.8)}

/* ─── QR Scanner ─── */
.qr-scanner-container{width:100%;max-width:350px;margin:0 auto;position:relative}
#qrScannerVideo{width:100%;border-radius:12px;overflow:hidden;background:#000}
.qr-scanner-overlay{position:relative;padding:12px 0}
.qr-scan-result{padding:12px;border:1px solid var(--beige);border-radius:10px;margin-top:12px;text-align:center}
.qr-scan-result .found-name{font-size:16px;font-weight:700;margin-bottom:6px}
.qr-scan-result .found-id{font-size:12px;color:var(--text-muted);font-family:monospace;margin-bottom:10px}
.qr-scan-actions{display:flex;gap:8px;justify-content:center}
.qr-scanner-hint{font-size:12px;color:var(--text-muted);text-align:center;margin-top:8px;line-height:1.5}

/* ─── Camera Capture Modal ─── */
.camera-capture-modal{position:fixed;inset:0;z-index:300;background:rgba(0,0,0,0.85);display:flex;flex-direction:column;align-items:center;justify-content:center;opacity:0;visibility:hidden;transition:opacity .25s,visibility .25s}
.camera-capture-modal.open{opacity:1;visibility:visible}
.camera-capture-video{width:100%;max-width:640px;max-height:70vh;border-radius:12px;background:#000;object-fit:contain}
.camera-capture-controls{display:flex;gap:16px;margin-top:20px;align-items:center}
.camera-capture-btn{width:64px;height:64px;border-radius:50%;background:#fff;border:4px solid var(--accent);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:var(--transition);box-shadow:0 2px 12px rgba(0,0,0,0.3)}
.camera-capture-btn:hover{transform:scale(1.1);box-shadow:0 4px 20px rgba(0,0,0,0.4)}
.camera-capture-btn:active{transform:scale(0.95)}
.camera-capture-btn-inner{width:48px;height:48px;border-radius:50%;background:var(--accent)}
.camera-capture-switch{width:44px;height:44px;border-radius:50%;background:rgba(255,255,255,0.2);border:none;color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:20px;transition:var(--transition)}
.camera-capture-switch:hover{background:rgba(255,255,255,0.35)}
.camera-capture-close{position:absolute;top:20px;right:20px;width:40px;height:40px;border-radius:50%;background:rgba(255,255,255,0.15);border:none;color:#fff;font-size:22px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:var(--transition)}
.camera-capture-close:hover{background:rgba(255,255,255,0.3)}
.camera-capture-hint{color:rgba(255,255,255,0.6);font-size:13px;margin-top:12px}
.camera-capture-error{color:rgba(255,255,255,0.7);font-size:14px;text-align:center;padding:40px 20px}
.camera-capture-error-icon{font-size:48px;margin-bottom:12px}

/* ─── PWA Install Button ─── */
.pwa-install-btn{position:fixed;top:12px;left:12px;z-index:90;display:flex;align-items:center;gap:6px;padding:8px 14px;background:var(--bg-card);border:1px solid var(--beige);border-radius:10px;font-size:13px;font-weight:600;color:var(--accent);cursor:pointer;box-shadow:var(--shadow-md);transition:var(--transition);animation:fadeInDown 0.5s ease}
.pwa-install-btn:hover{background:var(--accent);color:#fff;transform:translateY(-1px);box-shadow:var(--shadow-lg)}
.pwa-install-btn svg{width:16px;height:16px;fill:currentColor}
@keyframes fadeInDown{from{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}

/* ─── QR Code Canvas ─── */
.qr-canvas-wrapper{display:flex;align-items:center;justify-content:center;margin:0 auto}
.qr-canvas-wrapper canvas{border-radius:8px}

/* ─── Floating Drawer Toggle Button ─── */
.drawer-fab{position:fixed;top:16px;right:16px;z-index:150;width:46px;height:46px;border-radius:14px;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;font-size:20px;box-shadow:0 4px 16px rgba(217,119,87,0.4);transition:var(--transition);cursor:pointer}
.drawer-fab:hover{background:var(--accent-hover);transform:scale(1.08);box-shadow:0 6px 24px rgba(217,119,87,0.5)}
.drawer-fab.hidden{display:none}

/* ─── Overlay (behind drawer) ─── */
.drawer-overlay{position:fixed;inset:0;background:rgba(0,0,0,0.3);z-index:199;opacity:0;visibility:hidden;transition:var(--transition)}
.drawer-overlay.open{opacity:1;visibility:visible}

/* ─── Mobile ─── */
@media(max-width:768px){
  .right-drawer{width:100%;max-width:100%}
  .chat-header{padding:10px 12px}
  .chat-messages{padding:10px 12px}
  .input-row textarea{font-size:16px}
  .input-toolbar button{width:36px;height:36px}
  .send-btn{width:42px;height:42px}
  /* ── 移动端 MD 渲染优化 ── */
  .msg-group{max-width:88%}
  .msg-content{min-width:0;flex:0 1 auto;overflow:hidden;max-width:calc(100% - 44px)}
  .msg-bubble{padding:8px 10px;font-size:14px;line-height:1.65;overflow-wrap:break-word;word-break:break-word;max-width:100%;overflow:hidden;box-sizing:border-box;width:100%}
  /* 强制所有 MD 内容不超出气泡宽度 */
  .msg-bubble>*{max-width:100%;overflow-wrap:break-word;word-break:break-word;box-sizing:border-box}
  .msg-bubble p,.msg-bubble li,.msg-bubble h1,.msg-bubble h2,.msg-bubble h3,.msg-bubble h4,.msg-bubble h5,.msg-bubble h6,.msg-bubble blockquote,.msg-bubble div{overflow-wrap:break-word;word-break:break-word;max-width:100%}
  .msg-bubble a{word-break:break-all;overflow-wrap:break-word}
  /* 代码块：缩小内边距，允许横向滚动 */
  .msg-bubble pre{padding:8px 10px;font-size:12px;margin:4px 0;border-radius:6px;overflow-x:auto;-webkit-overflow-scrolling:touch;max-width:100%;box-sizing:border-box}
  .msg-bubble pre code{font-size:12px;word-break:normal;white-space:pre}
  /* 行内代码 */
  .msg-bubble code:not(pre code){font-size:12px;padding:1px 4px;word-break:break-all}
  /* 表格：横向可滚动，避免溢出 */
  .msg-bubble table{display:block;overflow-x:auto;-webkit-overflow-scrolling:touch;margin:6px 0;font-size:12px;max-width:100%}
  .msg-bubble thead,.msg-bubble tbody{display:table;width:100%;table-layout:fixed}
  .msg-bubble th,.msg-bubble td{padding:4px 6px;font-size:12px;min-width:40px;word-break:break-word}
  /* 列表：紧凑间距 */
  .msg-bubble ul,.msg-bubble ol{margin:4px 0;padding-left:20px}
  .msg-bubble li{margin:2px 0;font-size:13px}
  .msg-bubble li>p{margin:2px 0}
  /* 标题：缩小字号 */
  .msg-bubble h1{font-size:18px;margin:8px 0 4px}
  .msg-bubble h2{font-size:16px;margin:6px 0 3px}
  .msg-bubble h3{font-size:15px;margin:5px 0 3px}
  .msg-bubble h4,.msg-bubble h5,.msg-bubble h6{font-size:14px;margin:4px 0 2px}
  /* 引用 */
  .msg-bubble blockquote{padding-left:10px;margin:4px 0;font-size:13px}
  /* 图片：自适应宽度 */
  .msg-bubble img.chat-img{max-width:100%;max-height:200px}
  .msg-bubble img:not(.chat-img){max-width:100%;height:auto}
  /* 水平线 */
  .msg-bubble hr{margin:8px 0}
  /* 段落 */
  .msg-bubble p{margin:3px 0}
  /* KaTeX 公式：自适应 */
  .msg-bubble .katex-display{overflow-x:auto;-webkit-overflow-scrolling:touch;padding:4px 0}
  .msg-bubble .katex{font-size:13px}
  /* 折叠区域 */
  .collapsible-header{padding:6px 10px;font-size:12px}
  .collapsible-body{padding:6px 10px;font-size:12px;max-height:300px}
  /* 工具调用结果 */
  .tool-params,.tool-result{word-break:break-word;overflow-wrap:break-word;max-width:100%}
  /* 流式输出 */
  .chat-streaming{max-width:100%;overflow-wrap:break-word;word-break:break-word}
}
@media(max-width:480px){
  .chat-input{padding:6px 8px;padding-bottom:max(6px,env(safe-area-inset-bottom));gap:4px}
  .input-row textarea{padding:8px 10px;min-height:36px}
  .input-toolbar button{width:32px;height:32px;font-size:16px}
  .send-btn{width:38px;height:38px}
  .multi-select-bar{padding:10px 12px}
  .multi-select-bar .ms-actions button{padding:6px 14px;font-size:12px}
  /* ── 超小屏 MD 进一步优化 ── */
  .msg-group{max-width:92%}
  .msg-bubble{padding:6px 8px;font-size:13.5px}
  .msg-bubble pre{padding:6px 8px;font-size:11px}
  .msg-bubble pre code{font-size:11px}
  .msg-bubble code:not(pre code){font-size:11px;padding:0 3px}
  .msg-bubble th,.msg-bubble td{padding:3px 4px;font-size:11px}
  .msg-bubble h1{font-size:16px}
  .msg-bubble h2{font-size:15px}
  .msg-bubble h3{font-size:14px}
  .msg-bubble ul,.msg-bubble ol{padding-left:16px}
  .msg-bubble li{font-size:12.5px}
  .msg-bubble blockquote{padding-left:8px;font-size:12.5px}
  .msg-bubble .katex{font-size:12px}
  .collapsible-header{padding:5px 8px;font-size:11px}
  .collapsible-body{padding:5px 8px;font-size:11px;max-height:250px}
}

/* ─── Location Message Card ─── */
.location-card{width:240px;border-radius:12px;overflow:hidden;background:var(--bg-card);border:1px solid var(--beige);cursor:pointer;transition:var(--transition)}
.location-card:hover{border-color:var(--accent);box-shadow:0 0 0 2px var(--accent-light)}
.location-card .loc-map-preview{width:100%;height:120px;background:var(--cream);position:relative;overflow:hidden}
.location-card .loc-map-preview img{width:100%;height:100%;object-fit:cover}
.location-card .loc-map-preview .loc-pin{position:absolute;top:50%;left:50%;transform:translate(-50%,-100%);font-size:28px;filter:drop-shadow(0 2px 4px rgba(0,0,0,.3));pointer-events:none}
.location-card .loc-map-preview .loc-map-loading{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;color:var(--text-muted);font-size:13px;background:var(--cream)}
.location-card .loc-map-preview .loc-map-placeholder{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;background:var(--cream)}
.location-card .loc-map-preview .loc-map-placeholder .loc-map-icon{font-size:32px;filter:drop-shadow(0 2px 4px rgba(0,0,0,.15))}
.location-card .loc-map-preview .loc-map-placeholder .loc-map-hint{color:var(--text-muted);font-size:12px}
.location-card .loc-info{padding:10px 12px}
.location-card .loc-name{font-size:14px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.location-card .loc-addr{font-size:12px;color:var(--text-muted);margin-top:2px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.location-card .loc-coords{font-size:10px;color:var(--text-muted);margin-top:2px;opacity:.7;font-family:monospace}
.msg-group.sent .location-card{background:rgba(255,255,255,.15);border-color:rgba(255,255,255,.25)}
.msg-group.sent .location-card .loc-name{color:#fff}
.msg-group.sent .location-card .loc-addr{color:rgba(255,255,255,.8)}
.msg-group.sent .location-card .loc-coords{color:rgba(255,255,255,.5)}
.msg-group.sent .location-card .loc-map-preview .loc-map-loading{background:rgba(255,255,255,.1);color:rgba(255,255,255,.5)}
.msg-group.sent .location-card .loc-map-preview .loc-map-placeholder{background:rgba(255,255,255,.1)}
.msg-group.sent .location-card .loc-map-preview .loc-map-placeholder .loc-map-hint{color:rgba(255,255,255,.5)}

/* ─── Location Picker Modal ─── */
.loc-picker-overlay{position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:350;display:flex;align-items:center;justify-content:center;opacity:0;visibility:hidden;transition:opacity .25s,visibility .25s}
.loc-picker-overlay.open{opacity:1;visibility:visible}
.loc-picker{background:var(--bg-card);border-radius:20px;width:480px;max-width:95vw;max-height:90vh;overflow:hidden;display:flex;flex-direction:column;box-shadow:var(--shadow-lg)}
.loc-picker-header{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:1px solid var(--beige)}
.loc-picker-header h3{font-size:17px;font-weight:700}
.loc-picker-close{width:32px;height:32px;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:18px;color:var(--text-sec);transition:var(--transition)}
.loc-picker-close:hover{background:var(--cream);color:var(--accent)}
.loc-picker-search{padding:10px 16px;border-bottom:1px solid var(--beige);display:flex;gap:8px}
.loc-picker-search input{flex:1;padding:8px 12px;border:1px solid var(--beige);border-radius:10px;font-size:14px;background:var(--bg);outline:none;transition:var(--transition)}
.loc-picker-search input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-light)}
.loc-picker-search button{padding:8px 16px;background:var(--accent);color:#fff;border-radius:10px;font-size:13px;font-weight:600;transition:var(--transition)}
.loc-picker-search button:hover{background:var(--accent-hover)}
.loc-picker-map{width:100%;height:320px;background:var(--cream);position:relative}
.loc-picker-map #locPickerMap{width:100%;height:100%}
.loc-picker-map .loc-getting{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;color:var(--text-muted);font-size:14px}
.loc-picker-map .loc-getting .spinner{width:28px;height:28px;border:3px solid var(--beige);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}
.loc-picker-results{max-height:160px;overflow-y:auto;border-bottom:1px solid var(--beige)}
.loc-picker-results:empty{display:none}
.loc-result-item{padding:10px 16px;cursor:pointer;transition:var(--transition);border-bottom:1px solid var(--beige)}
.loc-result-item:last-child{border-bottom:none}
.loc-result-item:hover{background:var(--cream)}
.loc-result-item .loc-result-name{font-size:14px;font-weight:600}
.loc-result-item .loc-result-addr{font-size:12px;color:var(--text-muted);margin-top:2px}
.loc-picker-footer{padding:12px 16px;display:flex;align-items:center;justify-content:space-between;border-top:1px solid var(--beige)}
.loc-picker-footer .loc-selected-info{flex:1;min-width:0}
.loc-picker-footer .loc-selected-name{font-size:14px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.loc-picker-footer .loc-selected-addr{font-size:12px;color:var(--text-muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.loc-picker-footer .loc-send-btn{padding:10px 24px;background:var(--accent);color:#fff;border-radius:10px;font-size:14px;font-weight:600;transition:var(--transition);margin-left:12px;flex-shrink:0}
.loc-picker-footer .loc-send-btn:hover{background:var(--accent-hover)}
.loc-picker-footer .loc-send-btn:disabled{opacity:.5;cursor:not-allowed}
@media(max-width:480px){.loc-picker{width:100%;max-width:100%;border-radius:16px 16px 0 0;max-height:85vh}.loc-picker-map{height:260px}}
@media(max-width:480px){
  .msg-group.multi-selectable::before{left:-26px;width:18px;height:18px}
  .msg-group.multi-selectable.checked::after{left:-26px;width:18px;height:18px;font-size:10px}
  .chat-messages.multi-select-mode .msg-group{margin-left:26px}
  .chat-messages.multi-select-mode .msg-group.sent{margin-left:0;margin-right:26px}
}