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(min-width:40rem){.sm\:hidden{display:none}.sm\:inline{display:inline}.sm\:inline-flex{display:inline-flex}.sm\:grid-cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}.sm\:grid-cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}.sm\:grid-cols-\[auto_1fr\]{grid-template-columns:auto 1fr}.sm\:items-center{align-items:center}.sm\:gap-4{gap:calc(var(--spacing)*4)}.sm\:p-4{padding:calc(var(--spacing)*4)}.sm\:p-5{padding:calc(var(--spacing)*5)}.sm\:p-6{padding:calc(var(--spacing)*6)}.sm\:p-7{padding:calc(var(--spacing)*7)}.sm\:p-8{padding:calc(var(--spacing)*8)}.sm\:p-9{padding:calc(var(--spacing)*9)}.sm\:px-6{padding-inline:calc(var(--spacing)*6)}.sm\:px-7{padding-inline:calc(var(--spacing)*7)}.sm\:text-2xl{font-size:var(--text-2xl);line-height:var(--tw-leading,var(--text-2xl--line-height))}.sm\:text-4xl{font-size:var(--text-4xl);line-height:var(--tw-leading,var(--text-4xl--line-height))}.sm\:text-xs{font-size:var(--text-xs);line-height:var(--tw-leading,var(--text-xs--line-height))}}@media (min-width:48rem){.md\:col-start-2{grid-column-start:2}.md\:flex{display:flex}.md\:grid{display:grid}.md\:hidden{display:none}.md\:grid-cols-\[15rem_1fr\]{grid-template-columns:15rem 1fr}.md\:flex-col{flex-direction:column}.md\:px-10{padding-inline:calc(var(--spacing)*10)}.md\:py-10{padding-block:calc(var(--spacing)*10)}}@media (min-width:64rem){.lg\:grid-cols-\[1fr_18rem\]{grid-template-columns:1fr 18rem}}@media (min-width:80rem){.xl\:grid-cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}}}:root{--background:#f7f7fb;--surface:#fff;--surface-soft:#f4f1ff;--text:#19182a;--muted:#706e83;--border:#e7e5ef;--primary:#6536e9;--primary-dark:#5126cf;--success:#15966f;--success-soft:#e9faf3;--danger:#dc4161;--danger-soft:#fff0f3;--warning:#d27a12;--shadow:0 12px 34px #20184614}*{box-sizing:border-box}html{background:var(--background)}body{background:radial-gradient(circle at 5% -5%,#7042eb1a,transparent 30rem),var(--background);color:var(--text);margin:0;font-family:Arial,Helvetica,PingFang SC,Microsoft YaHei,sans-serif;line-height:1.5}a{color:inherit;text-decoration:none}button,input,textarea,select{font:inherit}button,a,input,textarea,select{outline-color:var(--primary);outline-offset:2px}button{cursor:pointer}.card{border:1px solid var(--border);background:var(--surface);border-radius:1.15rem}@supports (color:color-mix(in lab, red, red)){.card{background:color-mix(in srgb,var(--surface)96%,transparent)}}.card{box-shadow:var(--shadow)}.button{background:var(--primary);color:#fff;border:0;border-radius:.75rem;justify-content:center;align-items:center;gap:.5rem;min-height:2.75rem;padding:.65rem 1rem;font-weight:700;transition:transform .12s,background .12s,box-shadow .12s;display:inline-flex}.button:hover{background:var(--primary-dark);transform:translateY(-1px);box-shadow:0 9px 22px #6536e933}.button:disabled{cursor:not-allowed;opacity:.55;transform:none}.button-secondary{border:1px solid var(--border);color:var(--text);background:#fff}.button-secondary:hover{background:var(--surface-soft);color:var(--primary-dark)}.button-danger{background:var(--danger)}.button-ghost{color:var(--muted);background:0 0}.button-ghost:hover{background:var(--surface-soft);color:var(--primary);box-shadow:none}.field{gap:.4rem;display:grid}.field label,.label{color:#3d3a51;font-size:.9rem;font-weight:700}.input{width:100%;min-height:2.85rem;color:var(--text);background:#fff;border:1px solid #dcd9e8;border-radius:.75rem;padding:.7rem .8rem}.input:focus{border-color:var(--primary);box-shadow:0 0 0 3px #6536e91f}textarea.input{resize:vertical;min-height:6.5rem}.muted{color:var(--muted)}.eyebrow{color:var(--primary);letter-spacing:.08em;text-transform:uppercase;font-size:.74rem;font-weight:800}.badge{background:var(--surface-soft);color:var(--primary-dark);border-radius:999px;align-items:center;padding:.23rem .58rem;font-size:.74rem;font-weight:800;display:inline-flex}.page-grid{gap:1rem;display:grid}.page-header{justify-content:space-between;align-items:center;gap:1rem;display:flex}.page-title{letter-spacing:-.035em;margin:0;font-size:clamp(1.55rem,4vw,2.25rem)}.section-title{letter-spacing:-.015em;margin:0;font-size:1.1rem}.error-message{background:var(--danger-soft);color:#a52140;border-radius:.75rem;padding:.7rem .85rem;font-size:.9rem}.success-message{background:var(--success-soft);color:#087353;border-radius:.75rem;padding:.7rem .85rem;font-size:.9rem}.math-text{overflow-wrap:anywhere}.math-text .katex-display{padding:.35rem 0;overflow:auto hidden}.question-image{object-fit:contain;background:#f2f1f7;border-radius:.9rem;width:100%;max-height:22rem}@media (max-width:680px){.button{min-height:2.95rem}.page-header{align-items:flex-start}}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-gradient-position{syntax:"*";inherits:false}@property --tw-gradient-from{syntax:"<color>";inherits:false;initial-value:#0000}@property --tw-gradient-via{syntax:"<color>";inherits:false;initial-value:#0000}@property --tw-gradient-to{syntax:"<color>";inherits:false;initial-value:#0000}@property --tw-gradient-stops{syntax:"*";inherits:false}@property --tw-gradient-via-stops{syntax:"*";inherits:false}@property --tw-gradient-from-position{syntax:"<length-percentage>";inherits:false;initial-value:0%}@property --tw-gradient-via-position{syntax:"<length-percentage>";inherits:false;initial-value:50%}@property --tw-gradient-to-position{syntax:"<length-percentage>";inherits:false;initial-value:100%}@property --tw-leading{syntax:"*";inherits:false}@property --tw-font-weight{syntax:"*";inherits:false}@property --tw-tracking{syntax:"*";inherits:false}@property --tw-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-shadow-color{syntax:"*";inherits:false}@property --tw-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-inset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-shadow-color{syntax:"*";inherits:false}@property --tw-inset-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-ring-color{syntax:"*";inherits:false}@property --tw-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-ring-color{syntax:"*";inherits:false}@property --tw-inset-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-ring-inset{syntax:"*";inherits:false}@property --tw-ring-offset-width{syntax:"<length>";inherits:false;initial-value:0}@property --tw-ring-offset-color{syntax:"*";inherits:false;initial-value:#fff}@property --tw-ring-offset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-backdrop-blur{syntax:"*";inherits:false}@property --tw-backdrop-brightness{syntax:"*";inherits:false}@property --tw-backdrop-contrast{syntax:"*";inherits:false}@property --tw-backdrop-grayscale{syntax:"*";inherits:false}@property --tw-backdrop-hue-rotate{syntax:"*";inherits:false}@property --tw-backdrop-invert{syntax:"*";inherits:false}@property --tw-backdrop-opacity{syntax:"*";inherits:false}@property --tw-backdrop-saturate{syntax:"*";inherits:false}@property --tw-backdrop-sepia{syntax:"*";inherits:false}@property --tw-translate-x{syntax:"*";inherits:false;initial-value:0}@property --tw-translate-y{syntax:"*";inherits:false;initial-value:0}@property --tw-translate-z{syntax:"*";inherits:false;initial-value:0}@keyframes spin{to{transform:rotate(360deg)}}