@import url(https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,400;0,9..40,500;0,9..40,600;0,9..40,700;0,9..40,800;1,9..40,400&display=swap);:root{--bg:#f4f6fb;--surface:#fff;--primary:#4f46e5;--primary-dark:#3730a3;--primary-soft:#eef2ff;--accent:#0d9488;--accent-soft:#ccfbf1;--success:#059669;--success-soft:#ecfdf5;--warning:#d97706;--warning-soft:#fffbeb;--danger:#dc2626;--danger-soft:#fef2f2;--text:#0f172a;--text-muted:#64748b;--text-light:#94a3b8;--border:#e2e8f0;--shadow:0 1px 3px #0f172a0f,0 4px 16px #0f172a0a;--shadow-lg:0 8px 30px #0f172a14;--radius:14px;--radius-sm:8px;--font:"DM Sans","Segoe UI",system-ui,-apple-system,sans-serif}*,:after,:before{box-sizing:border-box}html{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{background:#f4f6fb;background:var(--bg);color:#0f172a;color:var(--text);font-family:DM Sans,Segoe UI,system-ui,-apple-system,sans-serif;font-family:var(--font);line-height:1.5;margin:0}code{font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;font-size:.9em}a{color:#4f46e5;color:var(--primary)}button,input,select,textarea{font-family:inherit}.app-shell{background:radial-gradient(ellipse 80% 50% at 10% -10%,#4f46e514,#0000),radial-gradient(ellipse 60% 40% at 90% 0,#0d94880f,#0000),#f4f6fb;background:radial-gradient(ellipse 80% 50% at 10% -10%,#4f46e514,#0000),radial-gradient(ellipse 60% 40% at 90% 0,#0d94880f,#0000),var(--bg);min-height:100vh}.app-card{background:#fff;background:var(--surface);border:1px solid #e2e8f0;border:1px solid var(--border);border-radius:14px;border-radius:var(--radius);box-shadow:0 1px 3px #0f172a0f,0 4px 16px #0f172a0a;box-shadow:var(--shadow)}.app-btn{align-items:center;border:none;border-radius:8px;border-radius:var(--radius-sm);cursor:pointer;display:inline-flex;font-size:.875rem;font-weight:600;gap:8px;justify-content:center;padding:10px 18px;transition:transform .12s ease,opacity .12s ease,background .15s ease}.app-btn:hover:not(:disabled){opacity:.92;transform:translateY(-1px)}.app-btn:disabled{cursor:not-allowed;opacity:.55;transform:none}.app-btn-primary{background:#4f46e5;background:var(--primary);color:#fff}.app-btn-primary:hover:not(:disabled){background:#3730a3;background:var(--primary-dark)}.app-btn-ghost{background:#fff;background:var(--surface);border:1px solid #e2e8f0;border:1px solid var(--border);color:#0f172a;color:var(--text)}.app-btn-danger{background:#fef2f2;background:var(--danger-soft);border:1px solid #fecaca;color:#dc2626;color:var(--danger)}.app-input{background:#fff;border:1.5px solid #e2e8f0;border:1.5px solid var(--border);border-radius:8px;border-radius:var(--radius-sm);color:#0f172a;color:var(--text);font-size:.9rem;outline:none;padding:10px 14px;transition:border-color .15s,box-shadow .15s;width:100%}.app-input:focus{border-color:#4f46e5;border-color:var(--primary);box-shadow:0 0 0 3px #4f46e526}.app-badge{align-items:center;border-radius:999px;display:inline-flex;font-size:.72rem;font-weight:600;padding:3px 10px}@keyframes pulse{0%,to{opacity:1}50%{opacity:.45}}@keyframes spin{to{transform:rotate(1turn)}}@keyframes fadeUp{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.problem-card:hover{border-color:#4f46e5!important;border-color:var(--primary)!important;box-shadow:0 8px 30px #0f172a14!important;box-shadow:var(--shadow-lg)!important;transform:translateY(-2px)}
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