:root{
  --navy:#0f2540;--navy2:#173a63;--red:#c9331f;--amber:#e39a00;--green:#1f7a4d;
  --ink:#1b2430;--muted:#5b6672;--line:#dde3ea;--bg:#f5f7fa;--card:#fff;--radius:12px;
  --font:"Noto Sans JP","Hiragino Kaku Gothic ProN","Hiragino Sans","Yu Gothic",Meiryo,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.75;font-size:16px}
a{color:var(--navy2)}
h1,h2,h3{line-height:1.35;margin:0 0 .5em}
.wrap{max-width:960px;margin:0 auto;padding:0 18px}
header.top{background:var(--navy);color:#fff}
header.top .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:60px}
header.top a.brand{color:#fff;text-decoration:none;font-weight:700;display:flex;align-items:center;gap:10px}
header.top a.brand img{width:32px;height:32px}
header.top .free{font-size:.78rem;background:var(--red);padding:.2em .8em;border-radius:999px;white-space:nowrap}
header.top nav a{color:#cfd8e3;text-decoration:none;font-size:.9rem;margin-left:14px}
.hero{background:linear-gradient(120deg,var(--navy),var(--navy2));color:#fff;padding:44px 0 36px}
.hero h1{font-size:clamp(1.5rem,3.6vw,2.3rem);margin-bottom:.4em}
.hero p{max-width:720px;opacity:.94;margin:0 0 .6em}
.badges{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.badges span{background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.3);border-radius:999px;padding:.25em .9em;font-size:.85rem}
.section{padding:32px 0}
.section h2{font-size:1.25rem;border-left:5px solid var(--red);padding-left:12px;margin-bottom:16px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px}
.ind{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:14px 16px;cursor:pointer;text-align:left;font-family:inherit;font-size:1rem;transition:.15s;display:flex;gap:12px;align-items:flex-start}
.ind:hover,.ind:focus-visible{border-color:var(--navy2);box-shadow:0 6px 18px rgba(15,37,64,.12);outline:none}
.ind.on{border-color:var(--red);box-shadow:0 0 0 3px rgba(201,51,31,.18)}
.ind .code{flex:none;width:34px;height:34px;border-radius:8px;background:var(--navy);color:#fff;font-weight:700;display:grid;place-items:center}
.ind .code.all{background:var(--red)}
.ind b{display:block;font-size:.95rem;line-height:1.35}
.ind small{color:var(--muted);font-size:.78rem;line-height:1.4;display:block;margin-top:3px}
.panel{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px 22px;margin-bottom:16px}
.opts{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:14px}
.opts label.t{font-weight:700;display:block;margin-bottom:6px;font-size:.92rem}
.seg{display:flex;flex-wrap:wrap;gap:6px}
.seg button{border:1px solid var(--line);background:#fff;border-radius:8px;padding:.45em .9em;font-family:inherit;font-size:.92rem;cursor:pointer}
.seg button.on{background:var(--navy);color:#fff;border-color:var(--navy)}
.btn{display:inline-block;border:0;border-radius:999px;padding:.85em 1.8em;font-family:inherit;font-size:1rem;font-weight:700;cursor:pointer;text-decoration:none;transition:.15s}
.btn-p{background:var(--red);color:#fff}.btn-p:hover{background:#a8291a}
.btn-n{background:var(--navy);color:#fff}.btn-n:hover{background:var(--navy2)}
.btn-o{background:#fff;color:var(--navy);border:2px solid var(--navy)}
.btn:disabled{opacity:.45;cursor:not-allowed}
.actions{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-top:14px}
.muted{color:var(--muted);font-size:.9rem}
/* quiz */
.qbar{position:sticky;top:0;z-index:10;background:#fff;border-bottom:1px solid var(--line)}
.qbar .wrap{display:flex;justify-content:space-between;align-items:center;min-height:52px;gap:12px;font-size:.92rem}
.timer{font-variant-numeric:tabular-nums;font-weight:700}
.timer.warn{color:var(--red)}
.prog{height:5px;background:var(--line)}
.prog i{display:block;height:100%;background:var(--red);transition:width .2s}
.qcard{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;margin:18px 0}
.meta{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:10px}
.tag{font-size:.75rem;border-radius:4px;padding:.15em .6em;background:var(--bg);border:1px solid var(--line);color:var(--muted)}
.tag.l1{background:#e8f4ec;color:var(--green);border-color:#bfe0cb}.tag.l2{background:#fff5df;color:#8a5b00;border-color:#f1d78f}.tag.l3{background:#fbe6e3;color:var(--red);border-color:#f1b8b0}
.scene{background:var(--bg);border-left:4px solid var(--navy);padding:12px 16px;border-radius:0 8px 8px 0;margin-bottom:14px}
.qtext{font-weight:700;font-size:1.05rem;margin-bottom:14px}
.choices{display:grid;gap:10px}
.choice{display:flex;gap:12px;align-items:flex-start;border:2px solid var(--line);border-radius:10px;padding:12px 14px;background:#fff;cursor:pointer;font-family:inherit;font-size:.98rem;text-align:left;line-height:1.55;transition:.12s}
.choice:hover{border-color:var(--navy2)}
.choice .k{flex:none;width:28px;height:28px;border-radius:50%;background:var(--navy);color:#fff;display:grid;place-items:center;font-weight:700;font-size:.9rem}
.choice.sel{border-color:var(--navy);background:#eef3f9}
.choice.ok{border-color:var(--green);background:#e8f4ec}.choice.ok .k{background:var(--green)}
.choice.ng{border-color:var(--red);background:#fbe6e3}.choice.ng .k{background:var(--red)}
.choice:disabled{cursor:default}
.exp{margin-top:16px;border-top:1px dashed var(--line);padding-top:14px}
.exp h4{margin:12px 0 4px;font-size:.92rem;color:var(--navy)}
.exp h4:first-child{margin-top:0}
.exp p{margin:0;font-size:.95rem}
.verdict{font-weight:700;margin-bottom:6px}.verdict.ok{color:var(--green)}.verdict.ng{color:var(--red)}
.nav2{display:flex;justify-content:space-between;gap:10px;margin:18px 0 40px}
/* result */
.score{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin:14px 0}
.score div{background:#fff;border:1px solid var(--line);border-radius:10px;padding:14px;text-align:center}
.score b{display:block;font-size:1.9rem;color:var(--navy);line-height:1.1}
.score span{font-size:.82rem;color:var(--muted)}
.pass{font-size:1.2rem;font-weight:700;padding:12px 16px;border-radius:10px;margin:10px 0}
.pass.ok{background:#e8f4ec;color:var(--green)}.pass.ng{background:#fff5df;color:#8a5b00}
table.t{width:100%;border-collapse:collapse;font-size:.9rem;background:#fff}
table.t th,table.t td{border:1px solid var(--line);padding:8px 10px;text-align:left}
table.t th{background:var(--bg)}
.bar{height:8px;background:var(--line);border-radius:4px;overflow:hidden}.bar i{display:block;height:100%;background:var(--navy2)}
.hist li{display:flex;justify-content:space-between;gap:10px;padding:8px 0;border-bottom:1px solid var(--line);font-size:.92rem}
/* certificate */
.cert{background:#fff;border:10px double var(--navy);padding:40px;text-align:center;max-width:720px;margin:20px auto}
.cert h2{font-size:1.7rem;border:0;padding:0;letter-spacing:.1em}
.cert .big{font-size:1.4rem;font-weight:700;margin:14px 0}
.cert .org{margin-top:26px;font-size:.92rem}
footer{background:var(--navy);color:#cfd8e3;padding:36px 0 24px;font-size:.88rem;margin-top:40px}
footer a{color:#fff}
footer .dis{background:rgba(255,255,255,.07);border-radius:10px;padding:14px 16px;margin-bottom:18px;font-size:.84rem}
@media print{header.top,footer,.qbar,.noprint{display:none!important}body{background:#fff}.cert{border-width:8px}}
@media (max-width:600px){.qcard{padding:16px}.choice{padding:10px 12px}header.top nav{display:none}}