:root{--bg: #f5f6fa;--surface: #ffffff;--border: #e3e6ee;--text: #1c2333;--muted: #6b7280;--primary: #4f46e5;--primary-hover: #4338ca;--danger: #dc2626;--shadow: 0 1px 2px rgba(16, 24, 40, .06), 0 8px 24px rgba(16, 24, 40, .06);--radius: 12px}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;font-family:Inter,Segoe UI,system-ui,-apple-system,Roboto,sans-serif;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;font-size:15px}h1,h2,h3,h4{margin:0;font-weight:650;letter-spacing:-.01em}p{margin:0}button{font:inherit;cursor:pointer}a{color:inherit;text-decoration:none}input,textarea,select{font:inherit;color:inherit}.muted{color:var(--muted)}.small{font-size:12.5px}.ellipsis{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.spacer{flex:1}.hide-mobile{display:inline}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:38px;padding:0 14px;border-radius:9px;border:1px solid var(--border);background:var(--surface);color:var(--text);font-weight:550;font-size:14px;transition:background .15s,border-color .15s,transform .05s}.btn:hover{background:#f3f4f8;border-color:#d4d8e4}.btn:active{transform:translateY(1px)}.btn:disabled{opacity:.55;cursor:not-allowed}.btn-primary{background:var(--primary);border-color:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-hover);border-color:var(--primary-hover)}.btn-danger{background:var(--danger);border-color:var(--danger);color:#fff}.btn-danger:hover{background:#b91c1c;border-color:#b91c1c}.btn-ghost{border-color:transparent;background:transparent}.btn-ghost:hover{background:#eef0f6}.btn-block{width:100%}.btn-sm{height:30px;padding:0 10px;font-size:13px}.icon-btn{display:inline-flex;align-items:center;justify-content:center;width:32px;height:32px;border-radius:8px;border:1px solid transparent;background:transparent;color:var(--muted);transition:background .15s,color .15s}.icon-btn:hover{background:#eef0f6;color:var(--text)}.icon-btn.danger:hover{background:#fee2e2;color:var(--danger)}.link-btn{border:none;background:none;padding:0;color:var(--primary);font-weight:600}.link-btn:hover{text-decoration:underline}.field{display:flex;flex-direction:column;gap:6px;margin-bottom:14px}.field span{font-size:13px;font-weight:600;color:#444c60}.field input,.search-box input,.share-input input,.page-input{height:40px;padding:0 12px;border:1px solid var(--border);border-radius:9px;background:var(--surface);outline:none;transition:border-color .15s,box-shadow .15s}.field input:focus,.search-box input:focus,.share-input input:focus{border-color:var(--primary);box-shadow:0 0 0 3px #4f46e524}select{height:34px;padding:0 8px;border:1px solid var(--border);border-radius:8px;background:var(--surface);outline:none}.form-error{background:#fef2f2;border:1px solid #fecaca;color:#b91c1c;border-radius:9px;padding:10px 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#dfe2ec;border-top-color:var(--primary);animation:spin .8s linear infinite}.spinner-sm{width:15px;height:15px;border-width:2px;border-color:#ffffff73;border-top-color:#fff}@keyframes spin{to{transform:rotate(360deg)}}.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px;background:radial-gradient(1100px 520px at 15% -10%,#e0e7ff 0%,transparent 55%),radial-gradient(900px 500px at 100% 0%,#fce7f3 0%,transparent 50%),var(--bg)}.auth-card{width:100%;max-width:440px;background:var(--surface);border:1px solid var(--border);border-radius:18px;box-shadow:var(--shadow);padding:30px}.auth-brand{display:flex;gap:14px;align-items:center;margin-bottom:22px}.auth-brand h1{font-size:22px}.auth-brand p{color:var(--muted);font-size:13.5px;margin-top:2px}.brand-mark{display:inline-flex;align-items:center;justify-content:center;width:46px;height:46px;border-radius:13px;background:var(--primary);color:#fff;flex:none}.segmented{display:grid;grid-template-columns:1fr 1fr;gap:4px;background:#eef0f6;padding:4px;border-radius:10px;margin-bottom:20px}.segmented button{height:34px;border:none;border-radius:8px;background:transparent;color:var(--muted);font-weight:600;font-size:14px}.segmented button.active{background:#fff;color:var(--text);box-shadow:0 1px 3px #1018281f}.auth-hint{margin-top:16px;text-align:center;font-size:13.5px;color:var(--muted)}.page{min-height:100vh;display:flex;flex-direction:column}.app-header{position:sticky;top:0;z-index:30;display:flex;align-items:center;justify-content:space-between;height:60px;padding:0 24px;background:#ffffffe6;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--border)}.brand{display:flex;align-items:center;gap:10px}.brand .brand-mark{width:34px;height:34px;border-radius:10px}.brand-name{font-weight:750;font-size:17px;letter-spacing:-.02em}.header-actions{display:flex;align-items:center;gap:10px}.library{width:100%;max-width:1180px;margin:0 auto;padding:28px 24px 60px}.library-head{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:20px}.library-head h1{font-size:26px;margin-bottom:4px}.dropzone{display:flex;flex-direction:column;align-items:center;gap:6px;padding:26px;border:1.6px dashed #c7ccdb;border-radius:var(--radius);background:var(--surface);color:var(--muted);text-align:center;cursor:pointer;transition:border-color .15s,background .15s;margin-bottom:22px}.dropzone:hover,.dropzone.dragging{border-color:var(--primary);background:#f7f7ff;color:var(--primary)}.dropzone 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8px}.doc-icon{display:inline-flex;align-items:center;justify-content:center;width:46px;height:56px;border-radius:8px;background:#eef2ff;color:var(--primary);flex:none}.doc-info{min-width:0;flex:1}.doc-info h3{font-size:15px;margin-bottom:5px}.doc-meta{display:flex;gap:6px;font-size:12.5px;color:var(--muted);flex-wrap:wrap}.doc-badges{display:flex;gap:6px;margin-top:9px;flex-wrap:wrap}.doc-actions{display:flex;justify-content:flex-end;gap:2px;padding:8px 10px 10px}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:60;background:#0f172a73;display:flex;align-items:center;justify-content:center;padding:20px}.modal{width:100%;background:var(--surface);border-radius:16px;box-shadow:0 24px 60px #0f172a4d;max-height:90vh;display:flex;flex-direction:column}.modal-head{display:flex;align-items:center;justify-content:space-between;padding:16px 18px;border-bottom:1px solid var(--border)}.modal-head 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60px}.pdf-page{--user-unit: 1;--total-scale-factor: calc(var(--scale-factor) * var(--user-unit));--scale-round-x: 1px;--scale-round-y: 1px;position:relative;background:#fff;box-shadow:0 2px 10px #0f172a2e;margin-bottom:22px;overflow:hidden;flex:none}.pdf-page.is-interactive{cursor:crosshair}.pdf-canvas{display:block;position:absolute;top:0;right:0;bottom:0;left:0}.textLayer{position:absolute;top:0;right:0;bottom:0;left:0;overflow:clip;text-align:initial;line-height:1;-webkit-text-size-adjust:none;text-size-adjust:none;forced-color-adjust:none;transform-origin:0 0;caret-color:CanvasText;z-index:1;--min-font-size: 1;--text-scale-factor: calc(var(--total-scale-factor) * var(--min-font-size));--min-font-size-inv: calc(1 / var(--min-font-size))}.textLayer :is(span,br){color:transparent;position:absolute;white-space:pre;cursor:text;transform-origin:0% 0%}.textLayer>:not(.markedContent),.textLayer .markedContent span:not(.markedContent){z-index:1;--font-height: 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strong{display:block;font-size:13.5px}.download-options .check .block{margin-top:3px}.download-progress{display:flex;align-items:center;gap:10px;margin-top:14px;font-size:13px;color:var(--muted)}.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:12px;margin-bottom:20px}.stat-card{display:flex;align-items:center;gap:12px;padding:14px 16px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);color:inherit;text-decoration:none;transition:box-shadow .15s,transform .15s}a.stat-card:hover{box-shadow:var(--shadow);transform:translateY(-2px)}.stat-icon{display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;border-radius:10px;background:#eef2ff;color:var(--primary);flex:none}.stat-body{display:flex;flex-direction:column;min-width:0}.stat-body strong{font-size:20px;line-height:1.25}.stat-hint{color:var(--muted)}.dash-columns{display:grid;grid-template-columns:repeat(auto-fit,minmax(330px,1fr));gap:16px;align-items:start}.dash-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:18px}.dash-card-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:14px}.dash-card-head h2{display:flex;align-items:center;gap:8px;font-size:16px}.dash-kv{display:flex;flex-direction:column;gap:10px;margin:0}.dash-kv>div{display:flex;align-items:baseline;justify-content:space-between;gap:14px;padding-bottom:9px;border-bottom:1px dashed var(--border)}.dash-kv>div:last-child{border-bottom:none;padding-bottom:0}.dash-kv dt{color:var(--muted);font-size:13px;flex:none}.dash-kv dd{margin:0;font-size:14px;text-align:right}.dash-usage{display:flex;flex-direction:column;gap:8px;margin-top:16px;padding-top:14px;border-top:1px solid var(--border)}.dash-form{display:flex;flex-direction:column;gap:12px}.dash-form .field{gap:5px}.dash-form-actions{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}.dash-activity{grid-column:1 / -1}.activity-block{margin-bottom:18px}.activity-block:last-child{margin-bottom:0}.activity-block h3{font-size:12.5px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin-bottom:8px}.activity-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:4px}.activity-list a{display:flex;align-items:center;gap:9px;padding:8px 10px;border-radius:9px;color:inherit;text-decoration:none;font-size:14px}.activity-list a:hover{background:var(--bg)}.activity-list .ellipsis{flex:1;min-width:0}.study-author{margin:-4px 0 12px}@media (max-width: 700px){.dash-columns{grid-template-columns:1fr}.library-toolbar{align-items:stretch}.toolbar-filters{width:100%}.filter-select{flex:1}}