:root{color-scheme:light;--ink: #16211c;--muted: #627169;--paper: #fffaf0;--panel: rgba(255, 255, 255, .82);--line: rgba(22, 33, 28, .14);--green: #0d6b4c;--green-soft: #dff3e8;--red: #b83b2e;--red-soft: #ffe3dc;--gold: #d79821;--shadow: 0 22px 70px rgba(28, 42, 34, .16);font-family:Hiragino Mincho ProN,Yu Mincho,YuMincho,"Noto Serif JP",serif}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh;color:var(--ink);background:radial-gradient(circle at 12% 10%,rgba(215,152,33,.22),transparent 34%),radial-gradient(circle at 88% 0%,rgba(13,107,76,.18),transparent 28%),linear-gradient(135deg,#fbf0d7,#f8f3ea 48%,#dceee2)}button,input,select{font:inherit}button{border:0;border-radius:999px;padding:.9rem 1.3rem;color:#fff;background:var(--green);cursor:pointer;box-shadow:0 10px 24px #0d6b4c33}button:disabled{cursor:not-allowed;opacity:.45}select,input{width:100%;border:1px solid var(--line);border-radius:16px;padding:.85rem 1rem;color:var(--ink);background:#ffffffb8}.shell{width:min(1180px,calc(100% - 32px));margin:0 auto;padding:32px 0}.hero{display:grid;grid-template-columns:1fr;gap:24px;align-items:end;margin-bottom:22px}.hero.compact{justify-items:end;margin-bottom:14px}.hero h1,.login-card h1{margin:0;max-width:760px;font-size:clamp(2rem,5vw,4.4rem);line-height:.95;letter-spacing:-.06em}.eyebrow{margin:0 0 10px;color:var(--green);font-family:Avenir Next,Helvetica Neue,sans-serif;font-size:.78rem;font-weight:800;letter-spacing:.18em;text-transform:uppercase}.panel{border:1px solid var(--line);border-radius:30px;background:var(--panel);box-shadow:var(--shadow);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px)}.scoreboard{display:grid;grid-template-columns:repeat(4,minmax(120px,1fr));gap:10px;width:min(720px,100%)}.scoreboard span{border:1px solid var(--line);border-radius:18px;padding:12px 14px;background:#ffffff94}.scoreboard b{font-size:1.35rem}.toolbar{display:flex;flex-wrap:wrap;gap:16px;align-items:end;padding:18px;margin-bottom:18px}.toolbar label{min-width:min(260px,100%);color:var(--muted);font-size:.86rem}.toolbar .toggle{display:flex;gap:10px;align-items:center;min-width:auto;color:var(--ink)}.toolbar input[type=checkbox]{width:auto}.question-grid{display:grid;grid-template-columns:minmax(0,1fr) 360px;gap:18px}.question-card,.side-card,.empty{padding:clamp(18px,4vw,34px)}.question-topline{display:flex;justify-content:space-between;gap:16px;color:var(--muted);font-family:Avenir Next,Helvetica Neue,sans-serif;font-weight:700}.question-card h2{margin:16px 0 22px;white-space:pre-wrap;font-size:clamp(1.02rem,1.45vw,1.42rem);line-height:1.72;letter-spacing:-.015em}.choices{display:grid;gap:12px}.choice{display:grid;grid-template-columns:38px 1fr;gap:12px;align-items:center;width:100%;border:1px solid var(--line);border-radius:22px;padding:14px;color:var(--ink);text-align:left;background:#ffffffa8;box-shadow:none}.choice:hover,.choice.selected{border-color:#0d6b4c7a;background:#fff}.choice.correct{border-color:#0d6b4c8c;background:var(--green-soft)}.choice.wrong{border-color:#b83b2e80;background:var(--red-soft)}kbd{display:grid;place-items:center;width:34px;height:34px;border-radius:50%;color:#fff;background:var(--ink);font-family:Avenir Next,Helvetica Neue,sans-serif}.actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}.secondary,.flag{color:var(--ink);background:#ffffffb8;box-shadow:none}.flag.active{color:var(--ink);background:#ffe5a3}.result{display:grid;place-items:center;min-height:92px;border-radius:24px;margin-bottom:20px;color:var(--muted);background:#ffffffad;font-size:2rem;font-weight:800}.result.ok{color:var(--green);background:var(--green-soft)}.result.ng{color:var(--red);background:var(--red-soft)}dl{display:grid;grid-template-columns:88px 1fr;gap:10px;margin:0 0 20px}dt{color:var(--muted)}dd{margin:0}.explanation h3{margin:0 0 8px}.explanation p,.explanation pre{white-space:pre-wrap;line-height:1.75}.explanation pre{max-height:520px;overflow:auto;border:1px solid var(--line);border-radius:18px;padding:14px;background:#ffffffad}.link-button{padding:0;color:var(--green);text-decoration:underline;background:transparent;box-shadow:none}.shortcuts{margin-top:18px;color:var(--muted);text-align:center}.login{display:grid;min-height:100vh;place-items:center;padding:24px}.login-card{width:min(520px,100%);border:1px solid var(--line);border-radius:36px;padding:clamp(24px,6vw,46px);background:#fffaf0e0;box-shadow:var(--shadow)}.login-card p{color:var(--muted);line-height:1.8}.login-card input{margin:16px 0 12px}.login-card button{width:100%}.form-error,.error{color:var(--red)}.error{padding:16px 18px;margin-bottom:18px}@media(max-width:880px){.hero,.question-grid{grid-template-columns:1fr}.scoreboard{min-width:0}}@media(max-width:560px){.shell{width:min(100% - 18px,1180px);padding:12px 0 24px}.scoreboard{grid-template-columns:1fr 1fr}.choice{grid-template-columns:32px 1fr;padding:12px}}