:root{--bg-app:#f8f9fa;--bg-sidebar:#fff;--bg-card:#fff;--bg-input:#fcfcfd;--border-light:#eef0f2;--border-focus:#4f46e5;--shadow-card:0 10px 40px -10px #0000000a;--shadow-input:0 4px 24px #00000005;--text-main:#18181b;--text-muted:#8e8e93;--text-light:#aeaeaf;--radius-lg:20px;--radius-md:12px;--radius-pill:9999px;color:var(--text-main);background:var(--bg-app);font-synthesis:none;text-rendering:geometricprecision;-webkit-font-smoothing:antialiased;letter-spacing:-.01em;font-family:system-ui,-apple-system,BlinkMacSystemFont,PingFang SC,Microsoft YaHei,Noto Sans CJK SC,Segoe UI,sans-serif}*{box-sizing:border-box}html{background:var(--bg-app)}body{background:var(--bg-app);min-width:320px;min-height:100vh;margin:0}body,button,input,textarea{font:inherit}a{color:inherit;text-decoration:none}button,textarea,input{border:0;outline:none}button{cursor:pointer;background:0 0}.app-shell{background:radial-gradient(circle at 50% -10%, #4f46e50f, transparent 34rem), 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p{color:var(--text-muted);margin:0;font-size:12px;line-height:1.7}@keyframes authSpin{to{transform:rotate(360deg)}}.main-viewport{flex:1;min-width:0;padding:40px 60px}.workspace-header{justify-content:space-between;align-items:flex-start;gap:24px;max-width:1120px;margin:0 auto 32px;display:flex}.workspace-header div{text-align:center;flex:1}.workspace-header p{color:var(--text-muted);margin:0 0 18px;font-size:13px;font-weight:500}.workspace-header h1{color:var(--text-main);margin:0;font-size:28px;font-weight:500;line-height:1.35}.workspace-header span{max-width:620px;color:var(--text-muted);margin:14px auto 0;font-size:14px;line-height:1.8;display:block}.top-action{border-radius:var(--radius-pill);color:#18181b94;letter-spacing:.14em;min-width:84px;height:34px;box-shadow:none;-webkit-user-select:none;user-select:none;cursor:default;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#ffffff75;border:1px solid #18181b0f;justify-content:center;align-items:center;padding:0 16px;font-size:11px;font-weight:700;display:inline-flex}.hero-composer{border:1px solid var(--border-light);border-radius:var(--radius-lg);background:var(--bg-card);max-width:960px;box-shadow:var(--shadow-card);grid-template-columns:116px minmax(0,1fr);gap:22px;margin:0 auto;padding:22px;display:grid;position:relative}.reference-card{width:96px;height:118px;color:var(--text-light);background:#fff;border:2px dashed #d1d5db;border-radius:18px;align-self:start;place-items:center;margin-top:10px;transition:border-color .2s,color .2s,transform .2s,box-shadow .2s;display:grid;transform:rotate(-5deg)}.reference-card span{font-size:28px;font-weight:300;line-height:1}.reference-card small{color:var(--text-light);margin-top:-24px;font-size:10px;transform:rotate(5deg)}.reference-card:hover{border-color:var(--border-focus);color:var(--border-focus);transform:rotate(-5deg)translateY(-2px);box-shadow:0 18px 35px #4f46e514}.composer-body{flex-direction:column;gap:18px;min-width:0;display:flex}.composer-body textarea{resize:vertical;width:100%;min-height:132px;color:var(--text-main);background:0 0;border:0;font-size:16px;line-height:1.75}.composer-body textarea::placeholder{color:var(--text-light)}.composer-body textarea:focus::placeholder{color:#c7c7ca}.composer-footer{border-top:1px solid var(--border-light);justify-content:space-between;align-items:center;gap:16px;padding-top:14px;display:flex}.tag-row{flex-wrap:wrap;gap:10px;display:flex}.tag-row button{border:1px solid var(--border-light);border-radius:var(--radius-pill);height:34px;color:var(--text-muted);background:#fff;padding:0 14px;font-size:13px;transition:border-color .2s,color .2s,background .2s}.tag-row button:hover{border-color:var(--border-focus);color:var(--border-focus);background:#fbfbff}.submit-circle{width:42px;height:42px;color:var(--text-main);background:#f0f1f3;border-radius:50%;flex:0 0 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b{color:#fff;background:var(--border-focus)}.history-grid{grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:20px;display:grid}.history-card{background:#fff;border:1px solid #0000000a;border-radius:12px;transition:transform .22s,box-shadow .22s,border-color .22s;overflow:hidden;box-shadow:0 4px 20px #00000005}.history-card:hover{border-color:#4f46e51f;transform:translateY(-2px);box-shadow:0 16px 36px #0000000b}.history-media{aspect-ratio:4/3;background:linear-gradient(135deg,#4f46e50b,#0000 42%),#f4f5f7;border-radius:8px;margin:10px 10px 0;position:relative;overflow:hidden}.history-media img{object-fit:cover;border-radius:8px;width:100%;height:100%;transition:transform .3s;display:block}.history-card:hover .history-media img{transform:scale(1.03)}.history-overlay{opacity:0;background:#0006;flex-direction:column;justify-content:space-between;padding:10px;transition:opacity .22s;display:flex;position:absolute;inset:0}.history-card:hover 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