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255, .06)}*{box-sizing:border-box;margin:0;padding:0}html,body{height:100%}html{scrollbar-gutter:stable}body{background:radial-gradient(1000px 500px at 85% -10%,var(--body-glow-a),transparent 60%),radial-gradient(800px 420px at -10% 110%,var(--body-glow-b),transparent 60%),var(--bg);color:var(--text);font-family:Segoe UI,PingFang SC,Microsoft YaHei,system-ui,sans-serif;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}.container{width:min(1120px,92vw);margin:0 auto}.card{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius)}.btn{display:inline-flex;align-items:center;gap:8px;border:none;border-radius:var(--radius-sm);padding:10px 18px;font-size:14px;font-weight:600;cursor:pointer;background:var(--primary);color:#fff;transition:filter .12s,transform .05s}.btn:hover{filter:brightness(1.15)}.btn:active{transform:translateY(1px)}.btn.ghost{background:var(--panel-2);border:1px solid var(--border);color:var(--text)}.btn[disabled]{opacity:.5;cursor:not-allowed}.chip{padding:3px 10px;border-radius:99px;font-size:12px;font-weight:600;background:#5aa9ff26;color:var(--accent)}.chip.easy{background:#00b89426;color:var(--ok)}.chip.hard{background:#e74c3c26;color:#ff7675}.loading,.empty,.error-tip{text-align:center;color:var(--muted);padding:60px 0;font-size:15px}.error-tip{color:#ff7675}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#6c5ce773;border-radius:99px}::-webkit-scrollbar-thumb:hover{background:#6c5ce7b3}::-webkit-scrollbar-corner{background:transparent}*{scrollbar-width:thin;scrollbar-color:rgba(108,92,231,.45) transparent}.confetti{position:fixed;top:0;left:0;z-index:300;pointer-events:none;overflow:hidden}.confetti-layer{position:absolute;top:0;right:0;bottom:0;left:0;overflow:hidden}.cf{position:absolute;transform-origin:center;box-shadow:0 0 4px #ffffff4d;animation:burst var(--dur, 1.3s) ease-out var(--delay, 0s) forwards}@keyframes burst{0%{transform:translate(0) rotate(0) rotateX(0);opacity:0;animation-timing-function:cubic-bezier(.15,.85,.3,1)}26%{transform:translate(calc(var(--tx) * .6),calc(var(--up) * -1)) rotate(var(--rot1)) rotateX(280deg);opacity:1;animation-timing-function:cubic-bezier(.45,0,.7,.4)}32%{transform:translate(calc(var(--tx) * .68),calc(var(--up) * -.96)) rotate(var(--rot2)) rotateX(340deg);opacity:1;animation-timing-function:cubic-bezier(.4,0,.75,.4)}62%{transform:translate(calc(var(--tx) * 1.02),calc(var(--down) * .32)) rotate(var(--rot3)) rotateX(460deg);opacity:.9;animation-timing-function:cubic-bezier(.35,0,.7,.45)}82%{transform:translate(calc(var(--tx) * 1.1),calc(var(--down) * .68)) rotate(var(--rot)) rotateX(600deg);opacity:.55;animation-timing-function:cubic-bezier(.4,0,.8,.4)}to{transform:translate(calc(var(--tx) * 1.12),var(--down)) rotate(var(--rot)) rotateX(720deg);opacity:0}}