:root{--ink:#14263b;--ink2:#4a5a6c;--mute:#8592a1;--line:#e6e1d4;--paper:#fbf8f1;--blue:#2f6db3;--blue2:#1f5596;--good:#1e9455;--bad:#d4432a;--yellow:#f4c64e;--font:ui-sans-serif,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;--serif:Georgia,"Times New Roman",serif}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}html,body{margin:0;height:100%;overflow:hidden;background:#1b232c;font-family:var(--font);color:var(--ink)}button{font:inherit;cursor:pointer}.hidden{display:none!important}#stage{position:fixed;top:0;right:0;bottom:0;left:0}#c{display:block;width:100%;height:100%;touch-action:none;cursor:grab}#c:active{cursor:grabbing}#top{position:fixed;top:0;left:0;right:0;display:flex;align-items:center;gap:12px;padding:12px 14px;background:linear-gradient(#0a121c99,#0a121c00);z-index:4}.home{display:flex;align-items:center;gap:8px;color:#fff;text-decoration:none;font-weight:800;font-size:15px;background:#ffffff29;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);padding:7px 12px 7px 8px;border-radius:99px;white-space:nowrap}.home .lg{width:26px;height:26px;border-radius:8px;background:linear-gradient(135deg,#ffd34d,#f39a1c);display:grid;place-items:center;color:#1d3a5c;font-size:14px}.chap{color:#fff;font-weight:800;font-size:16px;text-shadow:0 1px 3px rgba(0,0,0,.4);white-space:nowrap;min-width:0;overflow:hidden;text-overflow:ellipsis}.chap small{display:block;font-size:11px;font-weight:600;opacity:.85;letter-spacing:.6px;text-transform:uppercase}#dots{display:flex;gap:6px;margin-left:auto;margin-right:auto}.dot{width:30px;height:30px;border-radius:50%;border:0;background:#ffffff38;color:#fff;font-weight:800;font-size:12px;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);padding:0}.dot.done{background:#1e9455d9}.dot.on{background:#fff;color:var(--ink);box-shadow:0 0 0 3px #ffffff59}.tbtn{width:36px;height:36px;border-radius:50%;border:0;background:#fff3;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);font-size:15px;flex:none;padding:0}#labLink{color:#fff;text-decoration:none;font-weight:800;font-size:13px;background:#1e9455d9;padding:8px 12px;border-radius:99px;white-space:nowrap}#panel{position:fixed;left:50%;bottom:16px;transform:translate(-50%);width:min(640px,calc(100% - 24px));background:var(--paper);border-radius:20px;box-shadow:0 18px 50px #00000059;z-index:4;overflow:hidden}.ph{display:flex;align-items:flex-start;gap:12px;padding:16px 18px 6px}.ph .t{flex:1;min-width:0}.kick{font-size:11px;font-weight:800;letter-spacing:1.3px;text-transform:uppercase;color:var(--blue)}.ph h2{margin:2px 0 0;font-size:20px;line-height:1.2}#readToggle{display:none;border:1px solid var(--line);background:#fff;border-radius:10px;padding:6px 10px;font-weight:700;font-size:13px;color:var(--ink2);white-space:nowrap}.pb{padding:4px 18px 12px;max-height:46vh;overflow:auto}#pCaption{font-size:15px;line-height:1.5;color:var(--ink2);margin:6px 0 10px}#pCaption b{color:var(--ink)}#pRead{display:none;font-family:var(--serif);font-size:15.5px;line-height:1.55;color:#2c3b4f}#pRead p{margin:0 0 8px}#pRead mark{background:#f4c64e8c;padding:0 2px;border-radius:3px;font-weight:700;color:var(--ink)}#pRead .formula{font-family:var(--font);font-weight:800;text-align:center;background:#fff;border:2px solid var(--blue);border-radius:12px;padding:8px;margin:6px 0 10px;color:var(--ink)}#panel.reading #pRead{display:block}#pKeys{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:10px}#pKeys:empty{display:none}.key{border:1px solid #ecd58a;background:#fff6d8;color:#6d5300;border-radius:99px;padding:5px 11px;font-size:13px;font-weight:700}.key:before{content:"📖 ";font-size:11px}.ctl label{display:flex;justify-content:space-between;font-size:12px;font-weight:800;letter-spacing:.8px;text-transform:uppercase;color:var(--mute);margin-bottom:6px}.ctl output{font-family:ui-monospace,Menlo,Consolas,monospace;color:var(--ink);font-size:14px;letter-spacing:0;text-transform:none}.seg{display:flex;background:#ece8dd;border-radius:12px;padding:3px;gap:3px}.seg button{flex:1;border:0;border-radius:10px;padding:10px 6px;background:transparent;font-weight:700;color:var(--ink2);font-size:14px}.seg button.on{background:#fff;color:var(--ink);box-shadow:0 1px 4px #00000026}input[type=range]{width:100%;-webkit-appearance:none;-moz-appearance:none;appearance:none;height:8px;border-radius:9px;background:linear-gradient(90deg,var(--blue) var(--p,50%),#ddd8cc var(--p,50%));outline:none;margin:8px 0}input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:26px;height:26px;border-radius:50%;background:#fff;border:3px solid var(--blue);box-shadow:0 2px 6px #00000040}input[type=range]::-moz-range-thumb{width:22px;height:22px;border-radius:50%;background:#fff;border:3px solid var(--blue)}.nav{display:flex;gap:8px;padding:12px 14px;border-top:1px solid var(--line);background:#fff}.btn{border:0;border-radius:12px;padding:12px 16px;font-weight:800;font-size:15px;display:inline-flex;align-items:center;justify-content:center;gap:6px;transition:.15s}.btn.ghost{background:#efeadf;color:var(--ink)}.btn.ghost:disabled{opacity:.4;cursor:default}.btn.primary{background:var(--blue);color:#fff;box-shadow:0 3px 0 var(--blue2);flex:1}.btn.primary.lab{background:var(--good);box-shadow:0 3px #15703f}.btn.primary:active{transform:translateY(2px);box-shadow:0 1px 0 var(--blue2)}.btn.wide{width:100%;margin-top:14px}#checkWrap{position:fixed;top:0;right:0;bottom:0;left:0;background:#09101980;backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;padding:16px;z-index:10}#check{width:100%;display:flex;justify-content:center}.card{width:100%;max-width:500px;background:#fff;border-radius:20px;padding:24px;box-shadow:0 30px 60px #00000059;animation:pop .3s cubic-bezier(.2,1.4,.4,1)}@keyframes pop{0%{transform:scale(.92);opacity:0}}.card .kicker{font-size:11.5px;font-weight:800;letter-spacing:1.3px;text-transform:uppercase;color:var(--blue)}.card h2{margin:6px 0 12px;font-size:21px;line-height:1.3}.opts{display:grid;gap:9px}.opt{display:flex;align-items:center;gap:12px;text-align:left;border:2px solid var(--line);background:#fff;border-radius:14px;padding:12px 14px;font-size:15.5px;font-weight:700;color:var(--ink)}.opt span{flex:none;width:28px;height:28px;border-radius:8px;background:#efeadf;display:grid;place-items:center;font-size:13px}.opt:hover:not(:disabled){border-color:var(--blue)}.opt.right{border-color:var(--good);background:#e8f7ee}.opt.right span{background:var(--good);color:#fff}.opt.wrong{border-color:var(--bad);background:#fff1ee;animation:shake .35s}.opt.wrong span{background:var(--bad);color:#fff}@keyframes shake{25%{transform:translate(-6px)}75%{transform:translate(6px)}}.fb{margin-top:12px;padding:11px 13px;border-radius:12px;font-size:14.5px;line-height:1.45}.fb.good{background:#e8f7ee;color:#135e37}.fb.bad{background:#fff1ee;color:#8f2a17}#toast{position:fixed;left:50%;top:70px;transform:translate(-50%,-10px);max-width:min(480px,calc(100% - 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