*{box-sizing:border-box;margin:0;padding:0}
body{font-family:"Microsoft YaHei",Arial,sans-serif;color:#172033;background:#f6f8fb;line-height:1.7}
a{color:inherit;text-decoration:none}
.topbar{position:sticky;top:0;z-index:20;background:#fff;border-bottom:1px solid #e5eaf2}
.topbar-inner{max-width:1200px;height:68px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;padding:0 24px}
.brand{font-size:21px;font-weight:700;color:#1d4ed8;white-space:nowrap}
.top-links{display:flex;gap:24px;font-size:14px;color:#475569}
.global-search{position:sticky;top:68px;z-index:19;background:#f6f8fb;border-bottom:1px solid #e5eaf2}
.global-search-inner{max-width:1200px;margin:0 auto;padding:18px 24px;position:relative}
.layout{max-width:1200px;margin:0 auto;display:grid;grid-template-columns:260px 1fr;gap:28px;padding:34px 24px 60px}
.sidebar{position:sticky;top:154px;background:#fff;border:1px solid #e5eaf2;border-radius:8px;padding:20px;height:calc(100vh - 178px);overflow:auto}
.sidebar h2{font-size:18px;color:#1d4ed8;margin-bottom:14px}
.top-links a.active{color:#1d4ed8;font-weight:700}
.side-list{display:grid;gap:8px}
.side-list a{display:block;padding:10px 12px;border-radius:6px;font-size:14px;color:#334155}
.side-list a:hover,.side-list a.active{background:#eaf2ff;color:#1d4ed8}
.promo{background:#fff;border:1px solid #e5eaf2;border-radius:8px;padding:34px;display:grid;grid-template-columns:1fr;gap:28px;align-items:center}
.eyebrow{font-size:13px;font-weight:700;color:#1d4ed8;margin-bottom:8px}
h1{font-size:34px;line-height:1.3;color:#0f172a;margin-bottom:14px;letter-spacing:0}
.promo p,.category-hero p{max-width:780px;color:#475569;font-size:16px}
.btn-row{display:flex;gap:12px;margin-top:24px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:38px;padding:0 16px;border-radius:6px;font-size:14px;font-weight:700;width:max-content}
.btn-primary{background:#2563eb;color:#fff}
.btn-secondary{border:1px solid #cbd5e1;color:#334155;background:#fff}
.section{margin-top:28px}
.section-title{font-size:22px;color:#0f172a;margin-bottom:16px}
.search-panel{background:#fff;border:1px solid #e5eaf2;border-radius:8px;padding:18px 20px;margin-top:18px}
.global-search .search-panel{margin-top:0;padding:0;border:0;background:transparent}
.search-box{display:flex;align-items:center;gap:10px;background:#fff;border:1px solid #dbe3ee;border-radius:8px;padding:0 14px;height:48px}
.search-box:focus-within{border-color:#2563eb;background:#fff;box-shadow:0 0 0 3px rgba(37,99,235,.08)}
.search-icon{color:#64748b;font-size:16px;line-height:1}
.agent-search{width:100%;height:44px;border:0;outline:0;background:transparent;font:inherit;font-size:15px;color:#0f172a}
.agent-search::placeholder{color:#94a3b8}
.search-submit{height:36px;padding:0 18px;border:0;border-radius:6px;background:#2563eb;color:#fff;font-size:14px;font-weight:700;cursor:pointer;white-space:nowrap}
.search-submit:hover{background:#1d4ed8}
.search-empty{display:none;background:#fff;border:1px dashed #cbd5e1;border-radius:8px;padding:22px;text-align:center;color:#64748b;font-size:14px}
.search-empty.show{display:block}
.search-results{display:none;position:absolute;left:24px;right:24px;top:72px;z-index:30;background:#fff;border:1px solid #dbe3ee;border-radius:8px;box-shadow:0 16px 36px rgba(15,23,42,.12);overflow:hidden}
.search-results.show{display:block}
.search-result{display:block;padding:13px 16px;border-bottom:1px solid #edf2f7}
.search-result:last-child{border-bottom:0}
.search-result:hover{background:#f8fafc}
.search-result strong{display:block;font-size:15px;color:#0f172a;margin-bottom:3px}
.search-result span{display:block;font-size:12px;color:#2563eb;margin-bottom:3px}
.search-result p{font-size:13px;color:#64748b;line-height:1.55}
.agent-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.agent-card{background:#fff;border:1px solid #e5eaf2;border-radius:8px;padding:22px;display:flex;flex-direction:column;min-height:190px}
.agent-card h3{font-size:18px;color:#0f172a;margin-bottom:8px}
.agent-card p{font-size:14px;color:#475569;margin-bottom:10px}
.agent-card .btn{align-self:flex-end;margin-top:auto}
.tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:0;margin-bottom:14px}
.tag{font-size:12px;color:#2563eb;background:#eff6ff;border:1px solid #dbeafe;border-radius:999px;padding:3px 9px}
.category-band,.category-hero{background:#fff;border:1px solid #e5eaf2;border-radius:8px;padding:28px}
.category-list{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.category-item{border:1px solid #edf2f7;border-radius:8px;padding:16px;background:#fbfdff}
.category-item h3{font-size:16px;color:#0f172a;margin-bottom:6px}
.category-item p{font-size:13px;color:#64748b}
.note{margin-top:18px;background:#f8fafc;border-left:3px solid #2563eb;padding:14px 16px;color:#475569;font-size:14px}
.breadcrumb{font-size:13px;color:#64748b;margin-bottom:14px}
.breadcrumb a{color:#2563eb}
.detail-hero{background:#fff;border:1px solid #e5eaf2;border-radius:8px;padding:32px}
.detail-hero p{max-width:820px;color:#475569;font-size:16px}
.meta-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}
.meta-pill{font-size:13px;color:#334155;background:#f8fafc;border:1px solid #e5eaf2;border-radius:999px;padding:5px 11px}
.content-block{background:#fff;border:1px solid #e5eaf2;border-radius:8px;padding:24px;margin-top:18px}
.content-block h2{font-size:20px;color:#0f172a;margin-bottom:12px}
.content-block h3{font-size:16px;color:#0f172a;margin:16px 0 8px}
.content-block p,.content-block li{font-size:14px;color:#475569}
.content-block ul,.content-block ol{padding-left:20px}
.prompt-box{white-space:pre-wrap;background:#0f172a;color:#e5edf8;border-radius:8px;padding:18px;overflow:auto;font-size:13px;line-height:1.75;margin-top:12px}
.faq-item{border-top:1px solid #edf2f7;padding:14px 0}
.faq-item:first-child{border-top:0;padding-top:0}
.faq-item strong{display:block;color:#0f172a;margin-bottom:4px}
.related-list{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.related-list a{display:block;background:#fbfdff;border:1px solid #edf2f7;border-radius:8px;padding:14px;color:#2563eb;font-size:14px;font-weight:700}
.xhs-generator{padding:30px}
.xhs-tool-head{display:flex;align-items:baseline;justify-content:space-between;gap:16px;margin-bottom:18px;flex-wrap:wrap}
.xhs-tool-head h2{margin-bottom:0}
.xhs-tool-head span{font-size:13px;color:#64748b}
.xhs-form{display:grid;gap:12px}
.xhs-form label{font-size:14px;font-weight:700;color:#334155}
.media-copy-example{display:grid;gap:8px;margin:0 0 4px}
.media-copy-example-head{display:flex;align-items:center;justify-content:space-between;gap:12px}
.media-copy-example-title{font-size:13px;font-weight:700;color:#475569}
.media-copy-reference{border:1px solid #dbe3ee;background:#fff;color:#2563eb;border-radius:6px;padding:6px 12px;font:inherit;font-size:13px;font-weight:700;cursor:pointer}
.media-copy-reference:hover{background:#eff6ff;border-color:#bfdbfe}
.media-copy-example-text{border:1px solid #dbe3ee;background:#f8fafc;border-radius:8px;padding:12px 14px;font-size:14px;line-height:1.75;color:#475569;user-select:text}
.xhs-form textarea{width:100%;min-height:220px;resize:vertical;border:1px solid #dbe3ee;border-radius:8px;padding:16px;font:inherit;font-size:15px;color:#0f172a;background:#fff;outline:0;line-height:1.75}
.xhs-form textarea:focus{border-color:#2563eb;box-shadow:0 0 0 3px rgba(37,99,235,.08)}
.visual-setting-form{gap:18px}
.visual-form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.visual-field{display:grid;gap:7px}
.visual-field-wide{grid-column:1/-1}
.visual-field span{font-size:14px;font-weight:700;color:#334155}
.visual-field input,.visual-field select{width:100%;height:44px;border:1px solid #dbe3ee;border-radius:8px;padding:0 13px;font:inherit;font-size:14px;color:#0f172a;background:#fff;outline:0}
.visual-field select{cursor:pointer}
.visual-field input:focus,.visual-field select:focus,.visual-field textarea:focus{border-color:#2563eb;box-shadow:0 0 0 3px rgba(37,99,235,.08)}
.visual-field textarea{min-height:118px}
.visual-reference-block{border:1px solid #e5eaf2;border-radius:8px;background:#fbfdff;padding:16px}
.visual-reference-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin-bottom:12px;flex-wrap:wrap}
.visual-reference-head strong{font-size:14px;color:#0f172a}
.visual-reference-head span{font-size:13px;color:#64748b}
.visual-example-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}
.visual-example-card{display:grid;gap:4px;text-align:left;border:1px solid #dbe3ee;border-radius:8px;background:#fff;padding:12px 14px;cursor:pointer;font:inherit;min-height:76px}
.visual-example-card:hover{border-color:#bfdbfe;background:#eff6ff}
.visual-example-card strong{font-size:14px;color:#0f172a;line-height:1.45}
.visual-example-card span{font-size:12px;color:#64748b;line-height:1.55}
.xhs-actions{display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap}
.xhs-check{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:400!important;color:#475569!important}
.xhs-check input{width:16px;height:16px}
.ai-creation-controls{display:inline-flex;align-items:center;gap:10px;margin-left:auto}
.ai-creation-stop{width:42px;height:42px;border:1px solid #dbe3ee;border-radius:999px;background:#fff;position:relative;cursor:pointer;box-shadow:0 1px 2px rgba(15,23,42,.05)}
.ai-creation-stop:hover{border-color:#bfdbfe;background:#eff6ff}
.ai-creation-stop:focus-visible{outline:0;box-shadow:0 0 0 3px rgba(37,99,235,.14)}
.ai-creation-stop::before{content:"";position:absolute;left:50%;top:50%;width:14px;height:14px;transform:translate(-50%,-50%);border-radius:4px;background:#0f172a}
.ai-creation-stop[hidden]{display:none}
.xhs-status{min-height:24px;margin-top:14px;font-size:14px;color:#475569}
.xhs-output{margin-top:18px;border:1px solid #dbe3ee;border-radius:8px;background:#fbfdff;overflow:hidden}
.xhs-output-title{display:flex;align-items:center;min-height:42px;padding:0 16px;border-bottom:1px solid #e5eaf2;background:#f8fafc;font-size:14px;font-weight:700;color:#334155}
.xhs-result{display:block;min-height:260px;white-space:pre-wrap;background:#fff;padding:18px;font:inherit;font-size:14px;line-height:1.85;color:#172033;overflow:auto}
.academic-writing-output .xhs-result{min-height:0;height:auto;overflow:visible}
.academic-writing-output .xhs-result.is-placeholder{min-height:84px}
.internship-resume-output .xhs-result{min-height:0;height:auto;overflow:visible}
.internship-resume-output .xhs-result.is-placeholder{min-height:84px}
.ai-creation-actions{display:flex;justify-content:flex-end;gap:10px;flex-wrap:wrap;background:#fff;padding:0 16px 16px}
.ai-creation-action{display:inline-flex;align-items:center;justify-content:center;min-height:36px;padding:0 16px;border:1px solid #2563eb;border-radius:6px;background:#fff;color:#1d4ed8;font-size:14px;font-weight:700;text-decoration:none}
.ai-creation-action:hover{border-color:#1d4ed8;background:#eff6ff;color:#1e40af}
.ai-creation-action:focus-visible{outline:0;box-shadow:0 0 0 3px rgba(37,99,235,.14)}
.xhs-result.is-placeholder{color:#64748b}
.xhs-result.is-markdown{white-space:normal}
.mental-chat-generator{display:grid;gap:16px}
.mental-chat-quick{display:flex;gap:10px;flex-wrap:wrap}
.mental-chat-quick button{border:1px solid #dbe3ee;background:#fff;color:#2563eb;border-radius:999px;padding:8px 13px;font:inherit;font-size:13px;font-weight:700;cursor:pointer}
.mental-chat-quick button:hover{border-color:#bfdbfe;background:#eff6ff}
.mental-chat-log{display:flex;flex-direction:column;gap:14px;min-height:520px;max-height:680px;overflow:auto;border:1px solid #dbe3ee;border-radius:8px;background:#f8fafc;padding:18px;scrollbar-color:#cbd5e1 #f8fafc;scrollbar-width:thin}
.mental-chat-log::-webkit-scrollbar,.mental-chat-form textarea::-webkit-scrollbar{width:8px}
.mental-chat-log::-webkit-scrollbar-track,.mental-chat-form textarea::-webkit-scrollbar-track{background:#f8fafc}
.mental-chat-log::-webkit-scrollbar-thumb,.mental-chat-form textarea::-webkit-scrollbar-thumb{background:#cbd5e1;border-radius:999px;border:2px solid #f8fafc}
.mental-chat-empty{color:#64748b;font-size:14px;margin:auto;text-align:center}
.mental-chat-message{display:flex;flex-direction:column;gap:5px;max-width:78%}
.mental-chat-message-user{align-self:flex-end;align-items:flex-end}
.mental-chat-message-assistant{align-self:flex-start;align-items:flex-start}
.mental-chat-label{font-size:12px;font-weight:700;color:#64748b}
.mental-chat-message-user .mental-chat-label{text-align:right}
.mental-chat-body{display:inline-block;width:auto;max-width:100%;border:1px solid #e5eaf2;border-radius:8px;background:#fff;padding:12px 14px;color:#172033;font-size:14px;line-height:1.8}
.mental-chat-message-user .mental-chat-body{background:#eaf2ff;border-color:#bfdbfe;color:#1e3a8a}
.mental-chat-body p{margin:6px 0;color:inherit}
.mental-chat-body li{color:inherit}
.mental-chat-body p:first-child{margin-top:0}
.mental-chat-body p:last-child{margin-bottom:0}
.mental-chat-body ul,.mental-chat-body ol{margin:6px 0 6px 20px}
.mental-chat-form textarea{min-height:44px!important;max-height:138px;padding:9px 13px!important;resize:none;line-height:1.7;overflow:hidden;scrollbar-color:#cbd5e1 #fff;scrollbar-width:thin}
.mental-chat-actions{justify-content:space-between!important}
.xhs-result.is-markdown h3,.xhs-result.is-markdown h4{margin:18px 0 10px;color:#0f172a;line-height:1.45;font-weight:800}
.xhs-result.is-markdown h3:first-child,.xhs-result.is-markdown h4:first-child{margin-top:0}
.xhs-result.is-markdown h3{font-size:18px}
.xhs-result.is-markdown h4{font-size:16px}
.xhs-result.is-markdown p{margin:8px 0;line-height:1.85}
.xhs-result.is-markdown ul,.xhs-result.is-markdown ol{margin:8px 0 12px 22px;padding:0}
.xhs-result.is-markdown li{margin:5px 0;line-height:1.75}
.xhs-result.is-markdown code{background:#f1f5f9;border-radius:4px;padding:1px 5px;color:#0f172a}
.markdown-table-wrap{margin:12px 0 18px;overflow-x:auto;border:1px solid #e5eaf2;border-radius:8px}
.markdown-table-wrap table{width:100%;border-collapse:collapse;min-width:640px;background:#fff}
.markdown-table-wrap th,.markdown-table-wrap td{border-bottom:1px solid #e5eaf2;padding:10px 12px;text-align:left;vertical-align:top;line-height:1.7}
.markdown-table-wrap th{background:#f8fafc;color:#334155;font-weight:800}
.markdown-table-wrap tr:last-child td{border-bottom:0}
.college-form{gap:16px}
.college-form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.college-field{display:grid;gap:7px;min-width:0}
.college-field span{display:block;font-size:14px;font-weight:700;color:#334155}
.college-field input,
.college-field select,
.college-field textarea{width:100%;border:1px solid #dbe3ee;border-radius:8px;background:#fff;color:#0f172a;font:inherit;font-size:14px;outline:0}
.college-field input,.college-field select{height:44px;padding:0 13px}
.college-field select{cursor:pointer}
.college-field textarea{min-height:162px;padding:14px 16px;resize:vertical;line-height:1.75}
.college-field input:focus,
.college-field select:focus,
.college-field textarea:focus{border-color:#2563eb;box-shadow:0 0 0 3px rgba(37,99,235,.08)}
.college-field-wide{grid-column:1/-1}
.college-field-tall textarea{min-height:162px}
.college-field-span-2{grid-column:span 2}
.college-field-span-3{grid-column:span 3}
.college-field-span-4{grid-column:span 4}
.college-email-form-grid,.group-assignment-form-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
.college-email-form-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
.grad-supervisor-form-grid,.college-leave-form-grid{grid-template-columns:repeat(6,minmax(0,1fr))}
.college-form .xhs-actions{justify-content:flex-end}
.academic-writing-form-grid{grid-template-columns:1fr}
.academic-writing-polish-form .xhs-actions{justify-content:flex-end}
.internship-resume-form-grid .college-field-wide{grid-column:1/-1}
button:disabled{opacity:.65;cursor:not-allowed}
footer{border-top:1px solid #e5eaf2;background:#fff;color:#64748b;text-align:center;padding:26px;font-size:13px}
@media(max-width:900px){
    .layout,.promo{grid-template-columns:1fr}
    .layout{padding:22px 16px 44px}
    .global-search-inner{padding:14px 16px}
    .global-search{top:68px}
    .search-results{left:16px;right:16px;top:68px}
    .sidebar{position:static;height:auto}
    .topbar-inner{padding:0 16px}
    .top-links{display:none}
    h1{font-size:26px}
    .agent-grid,.category-list,.related-list{grid-template-columns:1fr}
    .visual-form-grid,.visual-example-grid,.college-form-grid{grid-template-columns:1fr}
    .college-field-wide,.college-field-span-2,.college-field-span-3,.college-field-span-4{grid-column:auto}
}