:root{--bg:#f7f8fa;--panel:#fff;--sidebar:#f2f3f5;--text:#17191c;--muted:#7b808a;--line:#e8e9ed;--accent:#4d6bfe;--accent-soft:#edf0ff;--danger:#e44d5e;--shadow:0 16px 50px rgba(27,31,46,.08);font-family:Inter,"PingFang SC","Microsoft YaHei",system-ui,sans-serif;color:var(--text);background:var(--bg)}*{box-sizing:border-box}html,body{margin:0;min-height:100%}body{font-size:14px}button,input,textarea,select{font:inherit}button,a{transition:.18s ease}button{cursor:pointer}a{color:inherit;text-decoration:none}h1,h2,h3,p{margin-top:0}.brand{display:flex;align-items:center;gap:10px;font-weight:750;font-size:17px}.brand-mark{display:grid;place-items:center;width:32px;height:32px;border-radius:11px;color:#fff;background:linear-gradient(145deg,#7691ff,#4966f2);box-shadow:0 8px 20px rgba(77,107,254,.22)}.brand-large{font-size:20px}.brand-large .brand-mark{width:40px;height:40px;border-radius:14px}.eyebrow{font-size:11px;letter-spacing:.16em;color:var(--accent);font-weight:800}.primary-btn,.secondary-btn,.ghost-btn,.icon-btn{border:0;border-radius:12px}.primary-btn{background:var(--accent);color:#fff;padding:13px 18px;font-weight:650;box-shadow:0 8px 20px rgba(77,107,254,.18)}.primary-btn:hover{background:#3f5bea;transform:translateY(-1px)}.primary-btn.inline{display:inline-flex;padding:10px 16px;width:auto;justify-content:center}.secondary-btn{background:var(--accent-soft);color:var(--accent);padding:10px 14px;white-space:nowrap}.ghost-btn{background:transparent;color:var(--muted);padding:8px 12px}.ghost-btn:hover,.icon-btn:hover{background:#eceef2;color:var(--text)}.icon-btn{background:transparent;color:#727782;width:34px;height:34px}.toast-stack{position:fixed;right:24px;top:20px;z-index:100;display:grid;gap:8px}.toast{background:#1f2228;color:#fff;padding:12px 18px;border-radius:12px;box-shadow:var(--shadow)}.toast.error{background:#a53b47}.toast.success{background:#27795c}.avatar{display:grid;place-items:center;flex:0 0 auto;width:34px;height:34px;border-radius:50%;background:linear-gradient(145deg,#dfe5ff,#c4cffd);color:#3c55cc;font-weight:750}.avatar.small{width:32px;height:32px;font-size:12px}

/* auth */
.auth-page{background:radial-gradient(circle at 14% 8%,#e8edff 0,transparent 34%),radial-gradient(circle at 86% 86%,#f1eaff 0,transparent 30%),#f9fafc}.role-shell,.auth-shell{position:relative;min-height:100vh;display:grid;place-items:center;padding:32px}.role-shell>.brand{position:absolute;left:36px;top:28px}.role-panel{text-align:center;width:min(820px,100%)}.role-panel h1{font-size:40px;letter-spacing:-.04em;margin:15px 0 10px}.lead{color:var(--muted);font-size:16px}.role-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:38px}.role-card{position:relative;display:flex;align-items:center;gap:18px;text-align:left;background:rgba(255,255,255,.86);border:1px solid rgba(255,255,255,.92);border-radius:24px;padding:26px;box-shadow:var(--shadow);overflow:hidden}.role-card:before{content:"";position:absolute;inset:auto -20px -60px auto;width:130px;height:130px;border-radius:50%;background:#e9edff}.role-card.teacher:before{background:#eee8ff}.role-card:hover{transform:translateY(-4px);border-color:#dce2ff}.role-visual{display:grid;place-items:center;z-index:1;width:64px;height:64px;border-radius:20px;background:#eff2ff;font-size:30px}.teacher .role-visual{background:#f1edff}.role-copy{display:grid;gap:6px;z-index:1}.role-copy strong{font-size:20px}.role-copy small{color:var(--muted);line-height:1.55}.arrow{margin-left:auto;z-index:1;font-size:22px;color:var(--accent)}.privacy-note{color:#a1a5ad;margin-top:26px;font-size:12px}.auth-shell .back-link{position:absolute;left:32px;top:28px;color:var(--muted)}.auth-card{width:min(430px,100%);background:rgba(255,255,255,.94);border:1px solid #fff;border-radius:26px;padding:34px 38px;box-shadow:var(--shadow)}.auth-card.wide{width:min(660px,100%)}.auth-card>.brand{margin-bottom:28px}.identity-pill{display:inline-flex;color:var(--accent);background:var(--accent-soft);padding:6px 10px;border-radius:99px;font-size:12px;font-weight:650}.auth-card h1{font-size:29px;margin:14px 0 6px}.auth-card>p{color:var(--muted);margin-bottom:24px}.stack-form{display:grid;gap:16px}.stack-form.two-col{grid-template-columns:1fr 1fr}.span-2{grid-column:1/-1}.stack-form label,.settings-form label,.modal label{display:grid;gap:8px;color:#4e525a;font-weight:600;font-size:13px}.stack-form input,.settings-form input,.settings-form select,.modal input,.modal select,.modal textarea{width:100%;border:1px solid var(--line);outline:0;border-radius:12px;padding:12px 13px;background:#fafbfc;color:var(--text);font-weight:400}.stack-form input:focus,.settings-form input:focus,.modal input:focus,.modal textarea:focus{border-color:#aebaff;box-shadow:0 0 0 3px #edf0ff;background:#fff}.code-row{display:flex;gap:8px}.code-row input{min-width:0}.auth-switch{text-align:center;color:var(--muted);font-size:13px;margin-top:20px}.auth-switch a{color:var(--accent);font-weight:650}
.field-hint{min-height:16px;color:var(--muted);font-size:12px;line-height:1.35}.field-hint.error{color:var(--danger);font-weight:700}.field-hint.ok{color:#2c9368}.stack-form input.invalid{border-color:var(--danger);box-shadow:0 0 0 3px #fff0f1;background:#fff}

/* chat */
.app-page{overflow:hidden;background:#fff}.app-layout{display:grid;grid-template-columns:260px 1fr;height:100vh}.sidebar{display:flex;flex-direction:column;padding:18px 12px 12px;background:var(--sidebar);border-right:1px solid #eef0f2;min-width:0}.sidebar-top{display:flex;align-items:center;justify-content:space-between;padding:0 8px 20px}.new-chat{display:flex;align-items:center;gap:8px;width:100%;border:0;border-radius:12px;background:#e5e8ee;color:#30333a;padding:11px 14px;text-align:left;font-weight:650}.new-chat:hover{background:#dde1e8}.new-chat span{font-size:19px}.side-section-title{padding:22px 12px 8px;color:#969ba4;font-size:11px}.conversation-list{display:grid;gap:3px;overflow:auto;min-height:80px}.conversation-item{display:flex;justify-content:space-between;align-items:center;width:100%;border:0;border-radius:10px;background:transparent;text-align:left;padding:10px 11px;color:#50545c}.conversation-item span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.conversation-item .more{opacity:0;font-style:normal;color:#8d929b}.conversation-item:hover,.conversation-item.active{background:#e4e6ea;color:#1f2227}.conversation-item:hover .more{opacity:1}.empty-side{color:#a0a4ac;padding:12px;font-size:12px}.side-nav{display:grid;gap:3px;margin-top:auto;padding-top:14px;border-top:1px solid #e2e4e8}.side-nav a{display:flex;gap:10px;padding:10px 12px;border-radius:10px;color:#555a63}.side-nav a:hover{background:#e4e6ea}.side-nav a span{width:16px;color:#707784}.user-card{display:flex;align-items:center;gap:10px;margin-top:8px;padding:10px 8px;border-radius:12px}.user-card>span:nth-child(2){min-width:0;display:grid}.user-card strong{font-size:13px;overflow:hidden;text-overflow:ellipsis}.user-card small{color:var(--muted);font-size:11px;margin-top:2px}.user-card form{margin-left:auto}.chat-main{position:relative;display:flex;flex-direction:column;min-width:0;height:100vh}.chat-header{height:64px;display:flex;align-items:center;justify-content:space-between;padding:0 22px;border-bottom:1px solid #f0f1f3}.chat-header>div{display:flex;align-items:center;gap:12px}.online-dot{font-size:11px;color:#8b9099}.online-dot:before{content:"";display:inline-block;width:6px;height:6px;border-radius:50%;background:#45ba82;margin-right:5px}.messages{flex:1;overflow:auto;padding:36px max(28px,calc((100% - 820px)/2)) 180px;scroll-behavior:smooth}.welcome-state{text-align:center;margin:9vh auto 0;max-width:700px}.ai-orb{display:grid;place-items:center;margin:0 auto 20px;width:54px;height:54px;border-radius:19px;background:linear-gradient(150deg,#7f95ff,#435ff4);color:#fff;font-weight:800;font-size:18px;box-shadow:0 14px 30px rgba(77,107,254,.25)}.welcome-state h1{font-size:30px;letter-spacing:-.03em;margin-bottom:8px}.welcome-state>p{color:var(--muted);font-size:15px}.suggestions{display:flex;justify-content:center;flex-wrap:wrap;gap:10px;margin-top:28px}.suggestions button{border:1px solid var(--line);background:#fff;padding:10px 14px;border-radius:99px;color:#555a64}.suggestions button:hover{border-color:#cdd5ff;color:var(--accent);background:#fafbff}.message-row{display:flex;gap:13px;margin:24px 0;line-height:1.75}.message-row.user{justify-content:flex-end}.message-bubble{max-width:82%;white-space:pre-wrap;word-break:break-word}.user .message-bubble{background:#f0f1f4;border-radius:18px 4px 18px 18px;padding:10px 15px}.assistant .message-bubble{padding:3px 0}.assistant-avatar{display:grid;place-items:center;width:30px;height:30px;flex:0 0 auto;border-radius:11px;background:var(--accent);color:#fff;font-size:11px;font-weight:750}.message-tools{display:flex;gap:8px;margin-top:7px}.message-tools button{border:0;background:transparent;color:#8b9098;padding:3px 6px;font-size:12px}.message-tools button:hover{color:var(--accent)}.skill-tag{color:#8e93a0;font-size:11px;margin-top:5px}.typing{display:flex;gap:4px;padding:8px 0}.typing i{width:6px;height:6px;border-radius:50%;background:#a8adba;animation:bounce 1.1s infinite}.typing i:nth-child(2){animation-delay:.14s}.typing i:nth-child(3){animation-delay:.28s}@keyframes bounce{0%,60%,100%{transform:translateY(0)}30%{transform:translateY(-5px)}}.composer-wrap{position:absolute;left:0;right:0;bottom:0;padding:24px max(28px,calc((100% - 820px)/2)) 13px;background:linear-gradient(transparent,#fff 28%)}.composer{display:flex;align-items:flex-end;gap:10px;background:#f5f6f8;border:1px solid #eceef1;border-radius:21px;padding:11px 12px 11px 18px;box-shadow:0 8px 25px rgba(20,24,35,.05)}.composer:focus-within{background:#fff;border-color:#ccd4ff;box-shadow:0 8px 28px rgba(62,78,135,.09),0 0 0 3px #f2f4ff}.composer textarea{flex:1;resize:none;border:0;outline:0;background:transparent;line-height:1.55;max-height:160px;padding:5px 0}.send-btn,.voice-btn{display:grid;place-items:center;flex:0 0 auto;width:34px;height:34px;border:0;border-radius:12px}.send-btn{background:var(--accent);color:#fff;font-size:19px}.voice-btn{background:#eceef4;color:#596171;font-size:16px}.voice-btn:hover{background:#e2e6f4;color:var(--accent)}.voice-btn.recording{background:#fff0f1;color:var(--danger);box-shadow:0 0 0 4px rgba(228,77,94,.1);animation:pulseVoice 1s infinite}.voice-btn.unsupported{opacity:.65}.send-btn:disabled{background:#b8becd}@keyframes pulseVoice{50%{transform:scale(.94)}}.disclaimer{text-align:center;color:#a0a4ad;font-size:10px;margin:8px 0 0}.mobile-only{display:none}
.assistant-status{align-items:center;gap:7px;color:#8b9098;font-size:12px;margin:1px 0 8px;line-height:1.4}.assistant-status [data-elapsed]{color:#a0a4ad}.assistant-status.done{color:#8f96a3}.status-spinner{width:12px;height:12px;border:2px solid #d8dce8;border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite;flex:0 0 auto}.assistant-status.done .status-spinner{display:none}@keyframes spin{to{transform:rotate(360deg)}}
.assistant .message-bubble{white-space:normal}.markdown-body{line-height:1.78;color:#333842}.markdown-body:empty{min-height:22px}.markdown-body p{margin:0 0 12px}.markdown-body p:last-child{margin-bottom:0}.markdown-body h2,.markdown-body h3,.markdown-body h4,.markdown-body h5{margin:18px 0 8px;line-height:1.35;color:#1f2430}.markdown-body h2{font-size:20px}.markdown-body h3{font-size:18px}.markdown-body h4,.markdown-body h5{font-size:16px}.markdown-body ul,.markdown-body ol{margin:8px 0 12px;padding-left:24px}.markdown-body li{margin:4px 0}.markdown-body strong{font-weight:800;color:#1f2430}.markdown-body em{color:#4f5664}.markdown-body del{color:#8d929b}.markdown-body blockquote{margin:10px 0 12px;padding:8px 12px;border-left:3px solid #cdd5ff;background:#f7f8ff;color:#555d72;border-radius:0 10px 10px 0}.markdown-body code{font-family:"SFMono-Regular",Consolas,monospace;background:#f1f2f5;border-radius:6px;padding:2px 5px;font-size:.92em;color:#29304a}.markdown-body pre{margin:10px 0 12px;padding:13px 14px;background:#171b24;color:#eef2ff;border-radius:12px;overflow:auto;line-height:1.6}.markdown-body pre code{display:block;background:transparent;color:inherit;padding:0;border-radius:0}.markdown-body a{color:var(--accent);text-decoration:none}.markdown-body a:hover{text-decoration:underline}.markdown-table-wrap{overflow:auto;margin:10px 0 12px;border:1px solid var(--line);border-radius:12px}.markdown-body table{width:100%;border-collapse:collapse;min-width:420px;background:#fff}.markdown-body th,.markdown-body td{padding:9px 11px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}.markdown-body th{background:#f7f8fb;color:#596171;font-weight:750}.markdown-body tr:last-child td{border-bottom:0}
.question-submit-card{display:flex;align-items:center;gap:10px;margin:10px 0 4px;padding:10px 12px;border:1px solid #dfe4ff;border-radius:13px;background:#f7f8ff;color:#596171;font-size:12px;line-height:1.5}.question-submit-card span{flex:1}.question-submit-card button{border:0;border-radius:10px;background:var(--accent);color:#fff;padding:7px 10px;font-size:12px;font-weight:650}.question-submit-card button:disabled{opacity:.7;cursor:wait}
.message-tools button[data-feedback]{color:#6973a8;background:#f3f5ff;border-radius:8px}.message-tools button[data-feedback]:hover{background:#edf0ff;color:var(--accent)}
.learning-mode-bar{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:0 0 9px;padding:9px 13px;border:1px solid #e4e8ff;border-radius:14px;background:rgba(247,248,255,.92);color:#6a7080;font-size:12px}.learning-mode-bar label{display:flex;align-items:center;gap:7px;color:#30395f;font-weight:750}.learning-mode-bar input{accent-color:var(--accent)}.learning-mode-bar span{line-height:1.5}

/* inner pages */
.inner-page{background:var(--bg);min-height:100vh}.inner-header{height:68px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;padding:0 32px;background:rgba(255,255,255,.88);border-bottom:1px solid var(--line);backdrop-filter:blur(14px);position:sticky;top:0;z-index:10}.inner-header nav{display:flex;gap:6px}.inner-header nav a{padding:9px 13px;border-radius:10px;color:#666b75}.inner-header nav a.active,.inner-header nav a:hover{background:#f0f2f6;color:#22252b}.inner-header>.avatar{justify-self:end}.content-shell{width:min(1160px,calc(100% - 48px));margin:0 auto;padding:54px 0}.page-heading{display:flex;justify-content:space-between;align-items:end;margin-bottom:30px}.page-heading h1{font-size:34px;margin:8px 0}.page-heading p{color:var(--muted);margin-bottom:0}.filter-tabs{display:flex;background:#eceef2;padding:4px;border-radius:12px}.filter-tabs button{border:0;background:transparent;padding:8px 13px;border-radius:9px;color:#70757e}.filter-tabs button.active{background:#fff;color:#222;box-shadow:0 2px 8px rgba(20,25,40,.06)}.work-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.work-card{display:flex;flex-direction:column;min-height:245px;background:#fff;border:1px solid #eceef1;border-radius:18px;padding:22px;box-shadow:0 8px 24px rgba(30,34,48,.035)}.work-card:hover{transform:translateY(-2px);box-shadow:var(--shadow)}.work-meta{display:flex;justify-content:space-between;color:#969ba5;font-size:11px}.category{display:inline-flex;width:max-content;padding:4px 8px;border-radius:7px;background:#edf0ff;color:#5368d8;font-size:10px}.category.office{background:#e9f7f1;color:#368462}.work-card h2{font-size:19px;margin:18px 0 10px}.work-card>p{color:#666b74;line-height:1.7}.work-actions{display:flex;gap:10px;margin-top:auto;border-top:1px solid #f0f1f3;padding-top:13px}.work-actions button,.row-actions button{border:0;background:transparent;color:#707681;padding:2px}.work-actions button:hover,.row-actions button:hover{color:var(--accent)}button.danger-text,.danger-text{color:var(--danger)}.empty-card{grid-column:1/-1;text-align:center;background:#fff;border:1px dashed #dfe2e8;border-radius:20px;padding:65px 24px;color:var(--muted)}.empty-card>div{font-size:34px;color:#aab4e9}.empty-card h2{color:var(--text);margin:14px 0 6px}

/* community */
.community-shell{width:min(1160px,calc(100% - 48px));margin:0 auto;padding:28px 0;display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:20px;height:calc(100vh - 68px)}.community-chat,.public-works{background:#fff;border:1px solid var(--line);border-radius:18px}.community-chat{display:flex;flex-direction:column;overflow:hidden}.community-title{display:flex;justify-content:space-between;align-items:center;padding:19px 22px;border-bottom:1px solid var(--line)}.community-title>div{display:flex;align-items:center;gap:9px}.community-title h1{font-size:17px;margin:0}.community-title>span{color:var(--muted);font-size:11px}.live-dot{width:8px;height:8px;border-radius:50%;background:#42bd82;box-shadow:0 0 0 4px #e7f7ef}.community-messages{flex:1;overflow:auto;padding:16px 22px}.community-message{display:flex;gap:11px;padding:10px 0}.community-message>div{min-width:0}.message-author{display:flex;align-items:center;gap:7px}.message-author>span{font-size:9px;color:#6f7ed0;background:#eff1ff;padding:2px 5px;border-radius:4px}.message-author time{font-size:10px;color:#a1a5ad}.community-message p{margin:5px 0 0;line-height:1.6;color:#454a52;word-break:break-word}.community-composer{display:flex;gap:10px;padding:15px 18px;border-top:1px solid var(--line)}.community-composer input{flex:1;border:0;outline:0;background:#f4f5f7;border-radius:12px;padding:11px 14px}.public-works{overflow:auto;padding:20px}.aside-heading span{color:var(--accent);font-size:10px;letter-spacing:.12em}.aside-heading h2{font-size:20px;margin:6px 0 18px}.public-works article{border-top:1px solid var(--line);padding:18px 2px}.public-works h3{margin:11px 0 7px}.public-works p{font-size:12px;color:#686d76;line-height:1.6}.public-works small{color:#9a9ea7}
.community-message.self{flex-direction:row-reverse;text-align:right}.community-message.self>div{display:grid;justify-items:end}.community-message.self .message-author{justify-content:flex-end}.community-message.self p{display:inline-block;max-width:min(560px,72vw);padding:8px 12px;border-radius:16px 4px 16px 16px;background:#eef2ff;color:#28316d;text-align:left}
.community-message.withdrawn p{display:inline-block;padding:8px 12px;border:1px dashed #f0b3bd;border-radius:13px;background:#fff6f7!important;color:#b34958!important;font-weight:650}.community-message.withdrawn .message-author strong{color:#9b6068}.community-composer input:disabled{color:#9aa0aa;background:#eceef2}.community-composer button:disabled{opacity:.6;cursor:not-allowed}
.settings-form textarea{width:100%;border:1px solid var(--line);outline:0;border-radius:12px;padding:12px 13px;background:#fafbfc;color:var(--text);font-weight:400;resize:vertical;line-height:1.55}.settings-form textarea:focus{border-color:#aebaff;box-shadow:0 0 0 3px #edf0ff;background:#fff}

/* study profile */
.study-profile-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-bottom:18px}.study-profile-grid article{display:grid;gap:8px;padding:19px;background:#fff;border:1px solid var(--line);border-radius:16px}.study-profile-grid span{color:#858a94;font-size:12px}.study-profile-grid strong{font-size:28px}.study-profile-grid small{color:var(--muted)}.study-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:18px}.study-main,.study-aside-card{min-width:0}.section-title{display:flex;justify-content:space-between;align-items:end;margin:8px 0 14px}.section-title h2{font-size:21px;margin:0}.section-title p{margin:4px 0 0;color:var(--muted)}.study-record-list{display:grid;gap:12px}.study-record{display:grid;gap:10px;padding:18px;background:#fff;border:1px solid var(--line);border-radius:18px}.study-record h3{margin:0;font-size:17px}.study-record p{margin:0;color:#59606b;line-height:1.7}.study-record-meta,.study-record-foot{display:flex;align-items:center;justify-content:space-between;gap:12px;color:#9aa0aa;font-size:12px}.study-type{display:inline-flex;padding:4px 8px;border-radius:99px;background:#eef2ff;color:#5368d8;font-weight:750}.study-type.wrong_question{background:#fff0f1;color:#c84f61}.study-type.plan{background:#eaf7f1;color:#23815d}.study-aside{display:grid;gap:14px;align-content:start}.study-aside-card{padding:18px}.study-aside-card h2{font-size:18px;margin-bottom:12px}.study-aside-card ol{margin:0;padding-left:20px;color:#5d6470;line-height:1.8}.study-aside-card p{color:#5d6470;line-height:1.8}.skill-meter{display:flex;justify-content:space-between;align-items:center;padding:9px 0;border-bottom:1px solid #f0f1f3}.skill-meter span{color:#5d6470}.skill-meter b{color:var(--accent)}

/* admin */
.admin-page{background:#f5f6f8}.admin-layout{display:grid;grid-template-columns:230px 1fr;min-height:100vh}.admin-sidebar{position:sticky;top:0;height:100vh;display:flex;flex-direction:column;background:#191b20;color:#dfe1e6;padding:24px 16px}.admin-sidebar .brand{padding:0 8px}.admin-badge{margin:9px 8px 28px;color:#747a86;font-size:10px;letter-spacing:.14em}.admin-sidebar nav{display:grid;gap:5px}.admin-sidebar nav button,.admin-sidebar nav a{display:flex;gap:11px;align-items:center;border:0;border-radius:10px;background:transparent;color:#9298a3;text-align:left;padding:11px 12px}.admin-sidebar nav button:hover,.admin-sidebar nav button.active,.admin-sidebar nav a:hover,.admin-sidebar nav a.active{background:#292c33;color:#fff}.back-app{margin-top:auto;padding:10px;color:#8c929c}.admin-main{padding:30px 34px 60px;min-width:0}.admin-main>header{display:flex;justify-content:space-between;align-items:center;margin-bottom:30px}.admin-main>header h1{font-size:28px;margin:6px 0 0}.user-card.compact{margin:0;background:#fff;border:1px solid var(--line);padding:8px 12px}.admin-panel{display:none}.admin-panel.active{display:block}.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.stat-grid article,.admin-card{background:#fff;border:1px solid var(--line);border-radius:16px}.stat-grid article{display:grid;gap:9px;padding:20px}.stat-grid span{color:#858a94;font-size:12px}.stat-grid strong{font-size:27px}.stat-grid small{color:#a2a6ae}.status-word{font-size:20px!important}.status-word.ok{color:#2c9368}.status-word.warn{color:#d98738}.intro-card{margin-top:16px;padding:27px}.intro-card h2{margin:8px 0}.intro-card p{color:var(--muted)}.flowline{display:flex;align-items:center;gap:10px;margin-top:28px;overflow:auto}.flowline span{background:#f2f3f6;padding:11px 14px;border-radius:10px;white-space:nowrap;font-weight:650}.flowline i{color:#a6abb4;font-style:normal}.settings-form{padding:26px}.form-section+.form-section{border-top:1px solid var(--line);margin-top:28px;padding-top:25px}.form-section h2{font-size:18px;margin-bottom:6px}.form-section>p{color:var(--muted);font-size:12px}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.settings-form label{margin-top:14px}.panel-toolbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px}.panel-toolbar h2{margin-bottom:5px}.panel-toolbar p{margin:0;color:var(--muted)}.skill-table{overflow:hidden}.table-head,.table-row{display:grid;grid-template-columns:1.5fr 1fr .7fr 1fr .8fr;gap:12px;align-items:center;padding:13px 18px}.table-head{background:#fafbfc;color:#959aa4;font-size:11px;border-bottom:1px solid var(--line)}.table-row+.table-row{border-top:1px solid var(--line)}.table-row>span:first-child{display:grid;gap:4px}.table-row small{color:var(--muted)}.table-row code{font-size:11px;color:#626874}.status-chip{width:max-content;background:#f0f1f3;color:#858a93;padding:4px 8px;border-radius:99px;font-size:10px}.status-chip.enabled{background:#eaf7f1;color:#308263}.row-actions{display:flex;gap:10px;align-items:center}.row-actions form{display:inline}.knowledge-grid{display:grid;gap:12px}.knowledge-card{display:grid;grid-template-columns:auto 1fr auto;gap:15px;align-items:center;padding:17px}.pdf-icon{display:grid;place-items:center;width:45px;height:52px;border-radius:10px;background:#fff0f1;color:#d84a59;font-size:10px;font-weight:800}.knowledge-card h3{margin:0 0 5px}.knowledge-card p{margin:0 0 5px;color:#70757f}.knowledge-card small{color:#a1a5ad}

.knowledge-card small{display:block}.binding-state{margin-top:6px;color:#c47732!important}.binding-state.bound{color:#2c9368!important}
.pdf-icon.excel{background:#eaf7f1;color:#23815d}.pdf-icon.markdown{background:#eef2ff;color:#4d5fd7}

/* AI points */
.ai-points-chip{display:inline-flex!important;align-items:center;gap:4px;width:max-content;margin-top:4px;padding:3px 7px;border:0;border-radius:99px;background:#edf0ff;color:var(--accent)!important;font-size:10px!important;font-weight:700}.ai-points-chip b{font-size:11px}.inline-point-link{border:0;background:transparent;color:var(--accent);padding:0;font-size:inherit;font-weight:750}.inline-point-link:hover{text-decoration:underline}.points-rule-pill{display:inline-flex;align-items:center;padding:8px 11px;border-radius:99px;background:#edf0ff;color:#4d5fd0;font-size:12px;font-weight:650;white-space:nowrap}.points-summary{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;padding:16px;margin-bottom:16px}.points-summary article{display:grid;gap:6px;padding:14px;border-radius:12px;background:#fafbff;border:1px solid #eef0ff}.points-summary span,.points-summary small{color:var(--muted)}.points-summary strong{font-size:24px}.points-head,.points-row{grid-template-columns:1.25fr .55fr .55fr 1.55fr 1.55fr}.point-balance{font-size:20px;color:#26346f}.inline-point-form{display:grid;grid-template-columns:.75fr 1fr auto;gap:7px;align-items:center}.inline-point-form input{min-width:0;border:1px solid var(--line);border-radius:10px;padding:8px 9px;background:#fafbfc}.inline-point-form button{border:0;border-radius:10px;padding:8px 10px;background:var(--accent-soft);color:var(--accent);font-weight:650}.tx-card{margin-top:16px;padding:22px}.tx-card h2{font-size:18px}.tx-list{display:grid;gap:0;border-top:1px solid var(--line)}.tx-list>div{display:grid;grid-template-columns:1.4fr .35fr .55fr .9fr;gap:12px;align-items:center;padding:11px 0;border-bottom:1px solid var(--line)}.tx-list span:first-child{display:grid;gap:3px}.tx-list small,.muted-line{color:var(--muted)}.tx-list b{font-size:16px}.tx-list b.plus{color:#2c9368}.tx-list b.minus{color:#d05665}.modal-subtitle{margin:0;color:var(--muted);line-height:1.7}.point-history-list{display:grid;border:1px solid var(--line);border-radius:14px;overflow:hidden}.point-history-row{display:grid;grid-template-columns:1fr auto auto;gap:12px;align-items:center;padding:12px 14px;background:#fff}.point-history-row+.point-history-row{border-top:1px solid var(--line)}.point-history-row span{display:grid;gap:3px}.point-history-row small{color:var(--muted)}.point-history-row b.plus{color:#2c9368}.point-history-row b.minus{color:#d05665}.point-history-row em{font-style:normal;color:var(--muted);font-size:12px}.history-empty{padding:24px;text-align:center;color:var(--muted)}.history-pagination{display:flex;justify-content:flex-end;align-items:center;gap:10px;color:var(--muted)}@media(max-width:680px){body .admin-sidebar nav{grid-template-columns:repeat(auto-fit,minmax(38px,1fr))}.points-summary,.question-stats,.moderation-stats{grid-template-columns:1fr 1fr}.points-rule-pill{white-space:normal}.inline-point-form{grid-template-columns:1fr}.tx-list>div{grid-template-columns:1fr auto}.point-history-row{grid-template-columns:1fr auto}.point-history-row em{grid-column:1/-1}}
.point-page-toolbar{align-items:flex-start}.points-filter{display:grid;grid-template-columns:2fr 1fr 1fr 1fr auto auto;gap:12px;align-items:end;padding:16px;margin-bottom:16px}.points-filter label{display:grid;gap:7px;color:#4e525a;font-weight:650;font-size:12px}.points-filter input,.points-filter select{border:1px solid var(--line);border-radius:11px;padding:10px 11px;background:#fafbfc}.points-list-card{overflow:hidden}.points-list-meta{display:flex;justify-content:space-between;padding:14px 18px;color:var(--muted);border-bottom:1px solid var(--line)}.point-user-list{overflow:auto}.point-user-head,.point-user-row{display:grid;grid-template-columns:1.6fr .65fr .65fr 1fr .5fr .55fr;gap:12px;align-items:center;min-width:880px;padding:13px 18px}.point-user-head{background:#fafbfc;color:#959aa4;font-size:11px;font-weight:700}.point-user-row+.point-user-row{border-top:1px solid var(--line)}.point-user-row>span:first-child{display:grid;gap:4px}.point-user-row small{color:var(--muted)}.pagination{display:flex;justify-content:flex-end;gap:7px;padding:15px 18px;border-top:1px solid var(--line)}.pagination a{padding:8px 11px;border-radius:10px;background:#f1f2f5;color:#606672}.pagination a.active,.pagination a:hover{background:var(--accent);color:#fff}.point-user-summary{display:flex;align-items:center;gap:12px;padding:13px;border:1px solid var(--line);border-radius:14px;background:#fafbff}.point-user-summary>div{display:grid;gap:4px}.point-user-summary small{color:var(--muted)}.point-action-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.point-action-grid form{display:grid;gap:12px;padding:15px;border:1px solid var(--line);border-radius:14px}.point-action-grid label{display:grid;gap:7px;color:#4e525a;font-weight:650;font-size:12px}.point-action-grid input{border:1px solid var(--line);border-radius:11px;padding:10px 11px;background:#fafbfc}
.question-stats{grid-template-columns:repeat(5,1fr)}.question-filter{grid-template-columns:1fr 1fr 2fr auto auto}.question-list-card{overflow:hidden}.question-admin-list{overflow:auto}.question-admin-head,.question-admin-row{display:grid;grid-template-columns:2fr .7fr .55fr .55fr 1fr .55fr;gap:12px;align-items:center;min-width:980px;padding:13px 18px}.question-admin-head{background:#fafbfc;color:#959aa4;font-size:11px;font-weight:700}.question-admin-row+.question-admin-row{border-top:1px solid var(--line)}.question-admin-row>span:first-child{display:grid;gap:4px}.question-admin-row small{color:var(--muted)}.answered-preview{color:#2c9368!important}.question-detail-card{display:flex;gap:12px;padding:13px;border:1px solid var(--line);border-radius:14px;background:#fafbff}.question-detail-card>div{display:grid;gap:5px}.question-detail-card small,.question-detail-card p{color:var(--muted);margin:0;line-height:1.6}.question-action-buttons{display:flex;gap:10px;justify-content:flex-end}.question-action-buttons form{display:inline}.modal [data-answer-form]{display:grid;gap:12px}.modal [data-answer-form] textarea{width:100%}
.moderation-stats{grid-template-columns:repeat(4,1fr)}.moderation-settings{margin-bottom:18px}.moderation-card{margin-top:18px;padding:0;overflow:hidden}.moderation-heading{display:flex;justify-content:space-between;align-items:flex-start;padding:20px 22px 12px}.moderation-heading h2{font-size:18px;margin-bottom:5px}.moderation-heading p{margin:0;color:var(--muted);line-height:1.6}.moderation-list{overflow:auto}.muted-user-head,.muted-user-row{display:grid;grid-template-columns:1.4fr .55fr .55fr 1fr .65fr;gap:12px;align-items:center;min-width:860px;padding:13px 18px}.withdrawn-record-head,.withdrawn-record-row{display:grid;grid-template-columns:1.1fr 1.7fr .8fr 1.15fr .65fr .85fr;gap:12px;align-items:center;min-width:1160px;padding:13px 18px}.muted-user-head,.withdrawn-record-head{background:#fafbfc;color:#959aa4;font-size:11px;font-weight:700;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.muted-user-row+.muted-user-row,.withdrawn-record-row+.withdrawn-record-row{border-top:1px solid var(--line)}.muted-user-row>span:first-child,.withdrawn-record-row>span:first-child,.withdrawn-record-row>span:nth-child(4){display:grid;gap:4px}.muted-user-row small,.withdrawn-record-row small{color:var(--muted)}.withdrawn-record-row>span:nth-child(2){line-height:1.65;color:#4f5661}.muted-user-row form{margin:0}
.point-ledger-card{margin-top:18px;padding:0;overflow:hidden}.ledger-heading{display:flex;justify-content:space-between;padding:20px 22px 10px}.ledger-heading h2{font-size:18px;margin-bottom:5px}.ledger-heading p{margin:0;color:var(--muted)}.ledger-filter{border:0;border-radius:0;margin:0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.point-ledger-list{overflow:auto}.point-ledger-head,.point-ledger-row{display:grid;grid-template-columns:1.25fr .45fr 1.35fr .45fr .55fr .8fr;gap:12px;align-items:center;min-width:980px;padding:13px 18px}.point-ledger-head{background:#fafbfc;color:#959aa4;font-size:11px;font-weight:700}.point-ledger-row+.point-ledger-row{border-top:1px solid var(--line)}.point-ledger-row small{color:var(--muted)}.point-ledger-row>span:first-child{display:grid;gap:4px}.point-ledger-row b.plus{color:#2c9368}.point-ledger-row b.minus{color:#d05665}

/* modal */
.modal{width:min(480px,calc(100% - 28px));border:0;border-radius:20px;padding:0;box-shadow:0 30px 90px rgba(15,19,35,.25)}.modal::backdrop{background:rgba(21,24,32,.42);backdrop-filter:blur(3px)}.modal>form,.modal>div{position:relative;display:grid;gap:16px;padding:28px}.modal h2{margin:0 0 4px}.modal-close{position:absolute;right:18px;top:16px;border:0;background:transparent;font-size:22px;color:#8b9099}.modal .check,.settings-form .check{display:flex;align-items:center;grid-template-columns:auto 1fr}.modal .check input,.settings-form .check input{width:auto}.wide-modal{width:min(780px,calc(100% - 28px))}.modal textarea{resize:vertical;line-height:1.55}.modal pre{background:#f6f7f9;border-radius:12px;padding:16px;max-height:60vh;overflow:auto;white-space:pre-wrap;line-height:1.6;color:#4c515a}.upload-help{margin:0;color:var(--muted);font-size:12px;line-height:1.65}.primary-btn:disabled{opacity:.65;cursor:wait;transform:none}

@media(max-width:900px){.app-layout{grid-template-columns:220px 1fr}.work-grid{grid-template-columns:1fr 1fr}.stat-grid{grid-template-columns:1fr 1fr}.admin-layout{grid-template-columns:190px 1fr}.admin-main{padding:25px 22px}.community-shell{grid-template-columns:1fr}.public-works{display:none}.skill-table{overflow:auto}.table-head,.table-row{min-width:760px}}
@media(max-width:680px){.role-grid,.stack-form.two-col,.form-grid{grid-template-columns:1fr}.span-2{grid-column:auto}.role-panel h1{font-size:31px}.role-card{padding:20px}.role-grid{margin-top:26px}.role-shell>.brand{left:22px}.auth-card{padding:28px 22px}.app-layout{display:block}.sidebar{position:fixed;z-index:50;inset:0 auto 0 0;width:270px;transform:translateX(-105%);box-shadow:20px 0 60px rgba(20,25,35,.18)}.sidebar.open{transform:translateX(0)}.mobile-only{display:block}.chat-header{padding:0 14px}.messages{padding:25px 18px 170px}.composer-wrap{padding:24px 14px 10px}.suggestions{display:grid}.message-bubble{max-width:90%}.inner-header{grid-template-columns:1fr auto;padding:0 18px}.inner-header nav{display:none}.content-shell{width:calc(100% - 28px);padding:34px 0}.page-heading{display:grid;gap:20px}.work-grid{grid-template-columns:1fr}.community-shell{width:calc(100% - 24px);height:calc(100vh - 88px);padding:12px 0}.admin-layout{display:block}.admin-sidebar{position:static;height:auto;padding:16px}.admin-sidebar nav{grid-template-columns:repeat(auto-fit,minmax(38px,1fr));margin-top:14px}.admin-sidebar nav button,.admin-sidebar nav a{justify-content:center;padding:10px 5px;font-size:0}.admin-sidebar nav button span,.admin-sidebar nav a span{font-size:17px}.admin-badge,.back-app{display:none}.admin-main{padding:24px 14px}.admin-main>header .user-card{display:none}.stat-grid{grid-template-columns:1fr 1fr}.stat-grid article{padding:15px}.flowline{align-items:stretch}.panel-toolbar{align-items:start}.knowledge-card{grid-template-columns:auto 1fr}.knowledge-card .row-actions{grid-column:1/-1}.table-head,.table-row{padding:12px}.toast-stack{left:14px;right:14px}.toast{text-align:center}}
@media(max-width:900px){.points-filter,.question-filter{grid-template-columns:1fr 1fr}.point-action-grid{grid-template-columns:1fr}.point-page-toolbar{display:grid;gap:12px}.pagination{justify-content:flex-start;overflow:auto}.question-stats{grid-template-columns:1fr 1fr}}
.conversation-item{display:grid!important;grid-template-columns:minmax(0,1fr) auto;gap:4px;align-items:center;padding:4px 6px!important}.conversation-title{min-width:0;border:0;background:transparent;text-align:left;padding:6px 5px;color:inherit;cursor:pointer}.conversation-title span{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.conversation-actions{display:flex;gap:2px;opacity:.58;transition:opacity .15s ease}.conversation-item:hover .conversation-actions,.conversation-item.active .conversation-actions{opacity:1}.conversation-action{display:grid;place-items:center;border:0;background:transparent;color:#8d929b;border-radius:8px;width:26px;height:26px;font-size:12px;line-height:1;cursor:pointer}.conversation-action:hover{background:#d9dde5;color:#333}.conversation-action.danger:hover{background:#fff0f1;color:var(--danger)}
.voice-btn{touch-action:none;user-select:none}.voice-btn.starting{background:#edf0ff;color:var(--accent);cursor:wait}.voice-btn.recording{cursor:grabbing}
@media(max-width:900px){.study-layout{grid-template-columns:1fr}.study-profile-grid{grid-template-columns:1fr 1fr}}@media(max-width:680px){.learning-mode-bar{display:grid;justify-content:stretch}.study-profile-grid{grid-template-columns:1fr}}