:root{--navy:#17324d;--acc:#c83d3d;--accd:#9e2f2f;--accw:#fff5f5;--yellow:#f3c746;--ink:#1f2933;--muted:#5f6b77;--line:#d9e0e6;--wash:#f3f6f9;--ok:#16803a;--okw:#e9f7ee;--bad:#b42318;--badw:#fdeeec;--amber:#c27c0e;--shadow:0 6px 22px rgba(23,50,77,.08)}
*{box-sizing:border-box}[hidden]{display:none!important}
body{margin:0;font-family:Arial,Helvetica,sans-serif;background:var(--wash);color:var(--ink);line-height:1.5;font-size:17px;-webkit-text-size-adjust:100%}a{color:inherit}
header{background:var(--navy);color:#fff}.nav{max-width:1120px;margin:auto;min-height:56px;display:flex;align-items:center;gap:14px;padding:0 16px}
.brand{font-size:1.22rem;font-weight:900;letter-spacing:-.03em;text-decoration:none;color:#fff}.brand .gcse{color:var(--yellow)}
.navlinks{margin-left:auto;display:flex;gap:4px;flex-wrap:wrap}.navlinks a{text-decoration:none;font-weight:700;font-size:.9rem;padding:8px 11px;border-radius:9px;color:#fff}.navlinks a:hover{background:rgba(255,255,255,.12)}
.lbar{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.97);border-bottom:1px solid var(--line);box-shadow:0 2px 10px rgba(23,50,77,.06)}
.lb-in{max-width:1120px;margin:auto;display:flex;align-items:center;gap:10px;padding:6px 16px;min-height:52px}
.lb-no{flex:none;background:var(--acc);color:#fff;font-weight:900;border-radius:9px;padding:5px 9px;font-size:.88rem;text-decoration:none}
.lb-t{margin:0;font-size:1.05rem;font-weight:900;color:var(--navy);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;min-width:0;flex:1;letter-spacing:-.01em}
.seg{display:flex;background:#e9eef3;border-radius:999px;padding:3px;flex:none}
.seg button{border:0;background:transparent;font:inherit;font-weight:800;font-size:.9rem;color:var(--navy);padding:7px 15px;border-radius:999px;cursor:pointer;min-height:38px}
.seg button[aria-pressed=true]{background:var(--navy);color:#fff;box-shadow:0 2px 6px rgba(23,50,77,.25)}
main{max-width:1120px;margin:auto;padding:14px 16px 40px}#qmode{min-height:calc(100vh - 52px)}
.qhead{display:flex;align-items:center;gap:12px;margin:2px 2px 10px;font-weight:900;color:var(--navy);font-size:.95rem}.qno,.qsc{white-space:nowrap}.qsc{color:var(--ok)}
.qdots{display:flex;gap:4px;flex:1;min-width:0}.qdots i{flex:1;height:7px;border-radius:9px;background:#dbe3ea;max-width:38px;transition:background .25s}
.qdots i.cur{background:#8aa1b6}.qdots i.ok{background:var(--ok)}.qdots i.bad{background:var(--bad)}.qdots i.fix{background:var(--amber)}
.qcard{background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);overflow:hidden}
.qfig,.nfig,.exfig,.thumb{background:radial-gradient(120% 90% at 50% 0%,#fbfdff 0%,#edf3f8 100%)}
.qfig{border-bottom:1px solid var(--line);padding:8px}
.qfig svg,.nfig svg,.exfig svg,.thumb svg{display:block;width:100%;height:auto;margin:auto}
.fig text{font-family:Arial,Helvetica,sans-serif}.fig .h{paint-order:stroke;stroke:#fff;stroke-width:4px;stroke-linejoin:round}
.fig .tap{cursor:pointer;outline:none;-webkit-tap-highlight-color:transparent}.fig .tap:hover{stroke:#17324d;stroke-opacity:.4;stroke-width:2;stroke-dasharray:6 5}.fig .tap:focus-visible{stroke:var(--yellow);stroke-width:4}
.qbody{padding:12px 16px 16px}.qhint{margin:0 0 8px;font-size:.9rem;color:var(--muted);font-weight:700;line-height:1.35}.qhint a{color:var(--accd)}
.qt{font-weight:800;font-size:1.12rem;margin:0 0 12px;line-height:1.35}
.opts{display:grid;gap:8px}.opts.two{grid-template-columns:1fr 1fr}
.opt{display:flex;align-items:center;gap:10px;text-align:left;border:2px solid #d3dde5;border-radius:13px;padding:9px 12px;background:#fff;font:inherit;font-weight:700;color:var(--ink);cursor:pointer;min-height:50px;line-height:1.25;transition:border-color .15s,background .15s}
.opt .k{flex:none;width:28px;height:28px;border-radius:50%;background:#edf2f6;color:var(--navy);display:grid;place-items:center;font-size:.86rem;font-weight:900}
.opt:hover:not(:disabled){border-color:var(--navy);background:#f7fafc}.opt:disabled{cursor:default}
.opt.right{background:var(--okw);border-color:var(--ok);color:#0f5a28}.opt.right .k{background:var(--ok);color:#fff}
.opt.wrong{background:var(--badw);border-color:var(--bad);color:#8a1c12}.opt.wrong .k{background:var(--bad);color:#fff}.opt.dim{opacity:.45}
.taphint{display:flex;align-items:center;gap:8px;margin:0;color:var(--accd);font-weight:800;font-size:.95rem}.taphint svg{width:22px;height:22px;flex:none}
.sheet{margin-top:14px;border-radius:16px;padding:14px 16px;border:2px solid var(--line);background:#fff;animation:rise .25s ease-out}
.sheet.ok{border-color:var(--ok);background:var(--okw)}.sheet.bad{border-color:var(--bad);background:var(--badw)}
.verdict{margin:0 0 4px;font-weight:900;font-size:1.12rem}.sheet.ok .verdict{color:var(--ok)}.sheet.bad .verdict{color:var(--bad)}
.fbt{margin:0;line-height:1.42}.keyi{margin:8px 0 0;font-size:.93rem;line-height:1.4;color:#33475b;padding-top:8px;border-top:1px dashed rgba(23,50,77,.2)}.keyi b{color:var(--navy)}
.sh-btns{display:flex;gap:8px;margin-top:12px}.sh-btns .btn{flex:1}
.btn{border:0;border-radius:12px;padding:11px 18px;font-weight:900;cursor:pointer;font-size:1rem;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:8px;font-family:inherit;min-height:48px;line-height:1.2}
.btn.primary{background:var(--acc);color:#fff}.btn.primary:hover{background:var(--accd)}.btn.soft{background:#e7edf2;color:var(--navy)}.btn.soft:hover{background:#dbe4eb}.btn.ghost{background:#fff;color:var(--navy);border:2px solid var(--line)}
.btnrow{display:flex;gap:10px;flex-wrap:wrap;margin-top:14px}
button:focus-visible,a:focus-visible{outline:3px solid var(--yellow);outline-offset:2px}
@keyframes rise{from{transform:translateY(12px);opacity:0}to{transform:none;opacity:1}}@keyframes up{from{transform:translateY(100%)}to{transform:none}}
.result{background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);padding:20px}
.rtop{display:flex;gap:18px;align-items:center}.rring{width:112px;height:112px;flex:none}.rarc{animation:dash .9s ease-out}@keyframes dash{from{stroke-dasharray:0 400}}
.result h2{margin:0 0 4px;color:var(--navy);font-size:1.3rem;line-height:1.25}.result p{margin:4px 0}.result .best{font-weight:900;color:var(--ok)}
.rmiss{margin-top:14px;background:var(--wash);border-radius:14px;padding:12px 16px}.rmiss h3{margin:0 0 6px;font-size:1rem;color:var(--navy)}.rmiss ul{margin:0;padding-left:20px}.rmiss li{margin:4px 0}
.inter h2{font-size:1.4rem}
.nhead{margin:4px 2px 14px}.nhead .kick{margin:0;color:var(--accd);font-weight:900;font-size:.9rem;text-transform:uppercase;letter-spacing:.04em}.nhead h2{margin:2px 0 0;color:var(--navy);font-size:1.6rem;letter-spacing:-.02em;line-height:1.15}.nhead p{margin:6px 0 0;color:var(--muted)}
.ncards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.ncard{background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);overflow:hidden;display:flex;flex-direction:column}
.nfig{border-bottom:1px solid var(--line);padding:6px}.ntext{padding:12px 16px 16px}.ntext h3{margin:0 0 4px;color:var(--navy);font-size:1.12rem;display:flex;gap:8px;align-items:center}.ntext p{margin:0}
.nno{flex:none;width:24px;height:24px;border-radius:50%;background:var(--acc);color:#fff;display:grid;place-items:center;font-size:.8rem}
.kw{display:flex;gap:6px;flex-wrap:wrap;margin-top:10px}.kw span{background:var(--accw);border:1px solid var(--line);border-radius:999px;padding:3px 10px;font-weight:800;color:var(--accd);font-size:.85rem}
.excard{margin-top:18px;background:#fff;border:2px solid var(--acc);border-radius:18px;padding:16px;box-shadow:var(--shadow)}.excard h2{margin:0 0 2px;color:var(--navy);font-size:1.25rem}.excard>p{margin:0 0 10px;color:var(--muted)}
.exfig{border:1px solid var(--line);border-radius:14px;padding:6px;max-width:620px;margin:0 auto}
.exbtns{display:flex;flex-wrap:wrap;gap:6px;margin:12px 0 4px;justify-content:center}.exbtns button{border:2px solid var(--line);background:#fff;border-radius:999px;padding:7px 13px;font:inherit;font-weight:700;font-size:.92rem;color:var(--navy);cursor:pointer;min-height:40px}
.exbtns button[aria-pressed=true]{background:var(--navy);border-color:var(--navy);color:#fff}.excard .btn{display:flex;margin:10px auto 0}
.exq{text-align:center;font-weight:900;color:var(--navy);margin:10px 0 0}.exmsg{text-align:center;font-weight:700;min-height:1.4em;margin:8px 0 0}.exmsg.good{color:var(--ok)}.exmsg.bad{color:var(--bad)}.exscore{text-align:center;font-weight:900;color:var(--navy);margin:4px 0 0}
.nbottom{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:18px}
.mistake{border-left:6px solid #d97706;background:#fff8eb;padding:14px 16px;border-radius:12px}.mistake h3{margin:0 0 6px;color:#92400e}.mistake p{margin:0}
.remember{border:2px solid #c9ddea;background:#f6fbff;border-radius:14px;padding:14px 16px}.remember h3{margin:0 0 6px;color:var(--navy)}.remember ul{margin:0;padding-left:20px}
.gcsebox{display:flex;gap:14px;align-items:center;flex-wrap:wrap;border:1px solid var(--line);border-radius:14px;padding:14px 16px;background:linear-gradient(90deg,#fff,#f2f7fb);margin-top:16px}.gcsebox .tag{background:var(--navy);color:#fff;font-weight:900;border-radius:10px;padding:7px 11px;font-size:.88rem}.gcsebox a{font-weight:900;color:var(--navy)}.gcsebox p{margin:0;flex:1;min-width:220px}
.lnav{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;margin-top:20px;font-weight:700;font-size:.95rem}.lnav a{color:var(--navy)}
footer{text-align:center;color:var(--muted);font-size:.9rem;padding:10px 20px 36px}footer a{color:var(--navy);font-weight:700}
.hero{background:linear-gradient(135deg,var(--navy),#274f74);color:#fff;border-bottom:6px solid var(--acc)}.hero-inner{max-width:1120px;margin:auto;padding:24px 16px 22px}
.crumb{color:#d9e6ef;font-size:.92rem;margin-bottom:8px;display:flex;gap:10px;align-items:center;flex-wrap:wrap}.crumb a{color:#fff}.pill{display:inline-block;background:var(--yellow);color:var(--navy);font-weight:900;border-radius:999px;padding:3px 11px;font-size:.8rem}
.hero h1{margin:0;font-size:clamp(1.9rem,5vw,3rem);line-height:1.05;letter-spacing:-.035em}.hero p{margin:10px 0 0;max-width:760px;color:#eef5fa}.hero .btnrow .btn.soft{background:#fff}
.ovlist{display:grid;gap:14px}.ovl{display:grid;grid-template-columns:minmax(0,260px) 1fr;gap:16px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);padding:12px}
.thumb{border-radius:12px;border:1px solid var(--line);padding:4px;display:block}.ovt h2{margin:2px 0 4px;font-size:1.25rem;color:var(--navy)}.ovt h2 a{text-decoration:none}.ovt p{margin:0 0 10px;color:var(--muted)}
.ovt .no{display:inline-block;background:var(--acc);color:#fff;font-weight:900;border-radius:8px;padding:2px 8px;font-size:.85rem}.ovb{display:flex;gap:8px;align-items:center;flex-wrap:wrap}.ovb .btn{min-height:42px;padding:9px 14px}.best{font-weight:900;color:var(--ok);margin-left:4px}
.card{background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);padding:16px 18px;margin-top:16px}.card h2{margin:0 0 6px;color:var(--navy);font-size:1.25rem}.card p{margin:0 0 6px}
table{width:100%;border-collapse:collapse;margin-top:8px}th,td{border:1px solid var(--line);padding:8px 10px;text-align:left;vertical-align:top}th{background:#f1f5f8;color:var(--navy)}
.dstats{display:flex;align-items:center;gap:14px;flex-wrap:wrap;font-weight:900;color:var(--navy);margin:2px 2px 12px}.dstats .bar{flex:1;min-width:140px;height:10px;background:#e2e8f0;border-radius:99px;overflow:hidden}.dstats .bar i{display:block;height:100%;width:0;background:var(--acc);transition:width .3s}
details.how{background:#fff;border:1px solid var(--line);border-radius:14px;padding:12px 16px;margin-top:16px}details.how summary{font-weight:900;color:var(--navy);cursor:pointer}
@media(min-width:860px){.qcard{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,1fr)}.qfig{border-bottom:0;border-right:1px solid var(--line);display:flex;align-items:flex-start;padding:16px}.qbody{padding:22px}.qt{font-size:1.2rem}}
@media(max-width:859px){.sheet{position:fixed;left:0;right:0;bottom:0;margin:0;border-radius:18px 18px 0 0;border-width:2px 0 0;z-index:40;max-height:58vh;overflow:auto;padding:12px 16px calc(12px + env(safe-area-inset-bottom));box-shadow:0 -10px 30px rgba(0,0,0,.18);animation:up .28s ease-out}body.sheet-open #qmode{padding-bottom:60vh}.ncards,.nbottom{grid-template-columns:1fr}.ovl{grid-template-columns:1fr}}
@media(max-width:600px){body{font-size:16px}.navlinks{display:none}.nav{min-height:50px}.brand{font-size:1.12rem}main{padding:10px 10px 30px}.lb-in{padding:5px 10px;min-height:48px;gap:8px}.lb-t{font-size:.98rem}.seg button{padding:6px 11px;font-size:.86rem;min-height:36px}
 .qhead{margin:0 2px 8px;font-size:.9rem;gap:8px}.qfig{padding:4px}.qbody{padding:10px 12px 12px}.qt{font-size:1.04rem;margin:0 0 10px}.opts{gap:7px}.opt{min-height:46px;padding:7px 10px;gap:8px}.opt .k{width:25px;height:25px;font-size:.8rem}
 .sh-btns .btn{min-height:46px;padding:9px 12px}.verdict{font-size:1.05rem}.fbt{font-size:.97rem}.rtop{gap:12px}.rring{width:90px;height:90px}.result{padding:16px}.result h2{font-size:1.12rem}.hero-inner{padding:18px 12px 16px}}
@media(prefers-reduced-motion:reduce){.sheet,.rarc{animation:none}.qdots i{transition:none}}