:root{--ink:#111714;--sub:#667069;--green:#16863f;--green-dark:#0f6a31;--line:#06c755;--paper:#f7f8f7;--surface:#fff;--border:#e5e9e6;--soft:#eef7f0;--warn:#fff7de;--danger:#a33b32;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans JP",sans-serif}
*{box-sizing:border-box}html{background:var(--paper)}body{margin:0;color:var(--ink);background:var(--paper);-webkit-font-smoothing:antialiased}button,input,select,textarea{font:inherit}button{cursor:pointer;color:inherit}.hidden{display:none!important}
.top{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.96);backdrop-filter:blur(14px);border-bottom:1px solid var(--border)}.topin{max-width:720px;margin:auto;height:64px;padding:0 18px;display:flex;align-items:center;justify-content:space-between}.brand{border:0;background:none;padding:0;display:flex;gap:10px;align-items:center;text-align:left}.brandmark{width:34px;height:34px;border-radius:10px;border:1px solid #cde5d2;color:var(--green);display:grid;place-items:center;font-weight:900;background:#f5fbf6}.brand strong{display:block;font-size:15px;line-height:1.2}.brand small{display:block;color:var(--sub);font-size:10px;margin-top:2px}.line-login{border:1px solid #cfe9d5;background:#fff;border-radius:10px;padding:8px 10px;display:flex;align-items:center;gap:7px;font-size:12px;font-weight:800}.line-dot{background:var(--line);color:#fff;border-radius:6px;padding:4px 5px;font-size:9px}.login-copy{white-space:nowrap}
.shell{max-width:720px;margin:auto;padding:0 18px 92px}.welcome{padding:42px 0 22px}.welcome .hello{font-size:14px;color:var(--sub);margin:0 0 5px}.welcome h1{font-size:32px;letter-spacing:-.03em;margin:0 0 8px}.welcome>p:last-child{margin:0;color:var(--sub);font-size:14px}.today-card{width:100%;border:0;border-radius:18px;background:linear-gradient(145deg,#f1faef,#e1f4e2);padding:20px;display:flex;align-items:center;justify-content:space-between;text-align:left;box-shadow:inset 0 0 0 1px #d2ead5}.today-card div{display:grid;gap:4px}.today-card .kicker{font-size:11px;color:var(--green-dark);font-weight:900}.today-card strong{font-size:20px}.today-card small{font-size:12px;color:var(--sub)}.arrow{font-size:34px;color:var(--green)}
.card-row{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:12px 0 26px}.plain-card{border:1px solid var(--border);background:#fff;border-radius:15px;padding:15px;text-align:left;display:grid;grid-template-columns:36px 1fr auto;gap:10px;align-items:center}.plain-card strong{display:block;font-size:13px}.plain-card small{display:block;color:var(--sub);font-size:10px;margin-top:3px}.iconbox,.menu-icon{width:34px;height:34px;border-radius:10px;background:#f0f5f1;display:grid;place-items:center;color:var(--green-dark);font-weight:900}
.section-block{margin:28px 0}.section-title{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}.section-title h2{font-size:17px;margin:0}.menu-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}.menu-grid button{border:1px solid var(--border);border-radius:15px;background:#fff;padding:16px;text-align:left}.menu-grid strong{display:block;font-size:13px;margin-top:10px}.menu-grid small{display:block;color:var(--sub);font-size:10px;margin-top:3px}.trust-note{margin:34px 0 10px;padding:18px;border-top:1px solid var(--border);border-bottom:1px solid var(--border)}.trust-note strong{font-size:13px}.trust-note p{font-size:12px;line-height:1.75;color:var(--sub);margin:7px 0 0}
.study-head,.subpage-head{height:58px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--border);margin:0 -18px;padding:0 18px;background:#fff}.subpage-head{justify-content:flex-start;gap:14px}.subpage-head h1{font-size:17px;margin:0}.study-title{text-align:center;display:grid}.study-title span{font-size:14px;font-weight:850}.study-title small{font-size:10px;color:var(--sub)}.text-btn{border:0;background:none;padding:8px 0;color:#4e5a53;font-size:12px;font-weight:750}.filter-sheet{background:#fff;border-bottom:1px solid var(--border);margin:0 -18px;padding:14px 18px;display:grid;grid-template-columns:1fr 1fr;gap:10px}.filter-sheet .btn{grid-column:1/-1}.thin{height:3px;background:#edf0ee;margin:0 -18px}.thin>div{height:100%;background:var(--green);width:0}.question-stage{padding:24px 0 12px}.qmeta{font-size:11px;color:var(--sub);margin-bottom:13px}.question-stage h3,.exam-question h3{font-size:19px;line-height:1.75;margin:0 0 20px;font-weight:750}.choice{width:100%;border:1px solid var(--border);background:#fff;border-radius:12px;padding:14px 15px;margin:8px 0;text-align:left;line-height:1.5}.choice.correct{border-color:#4a9c69;background:#edf8f0}.choice.wrong{border-color:#c87870;background:#fff2f1}.result{font-size:16px;font-weight:900;margin:16px 0}.good{color:#18794e}.bad{color:#b42318}.answer-actions{display:flex;gap:8px}.answer-actions .btn{flex:1}.community-panel{background:#fff;border:1px solid var(--border);border-radius:16px;padding:18px;margin:12px 0}.community-panel h3{font-size:15px;margin:0 0 12px}.community-body{line-height:1.8;font-size:14px}.credit{font-size:11px;color:var(--sub);border-top:1px solid #eef1ef;margin-top:14px;padding-top:11px}.community-actions{display:flex;gap:8px;margin-top:14px}
.btn{border:0;border-radius:11px;padding:12px 15px;font-weight:850}.primary{background:var(--green);color:#fff}.primary:hover{background:var(--green-dark)}.secondary,.tertiary{background:#fff;border:1px solid var(--border)}.wide{width:100%}.surface{background:#fff;border:1px solid var(--border);border-radius:16px;padding:20px;margin:18px 0}.lead{color:var(--sub);font-size:13px;line-height:1.7}.exam-options{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:18px 0}.exam-option{border:1px solid var(--border);background:#fff;border-radius:13px;padding:16px;text-align:left}.exam-option.selected{border-color:#73b987;background:#f0f8f2}.exam-option strong{display:block}.exam-option small{color:var(--sub);font-size:10px}.score-hero{margin:18px 0;background:#fff;border:1px solid var(--border);border-radius:16px;padding:22px;display:flex;justify-content:space-between;align-items:end}.score-hero>div:first-child span{font-size:11px;color:var(--sub);display:block}.score-hero strong{font-size:44px;letter-spacing:-.04em}.score-meta{display:grid;gap:6px;font-size:12px;color:var(--sub);text-align:right}.stat-list{background:#fff;border:1px solid var(--border);border-radius:16px;padding:8px 16px}.statrow{display:grid;grid-template-columns:minmax(105px,1fr) 1.4fr 46px;gap:10px;align-items:center;padding:13px 0;border-bottom:1px solid #eef1ef;font-size:12px}.statrow:last-child{border-bottom:0}.mini{height:5px;background:#edf0ee;border-radius:99px;overflow:hidden}.mini i{display:block;height:100%;background:var(--green)}
.inline-note{background:var(--warn);padding:13px 14px;border-radius:12px;font-size:12px;line-height:1.65;margin:16px 0}.form-surface label{display:block;font-size:12px;font-weight:800;margin:11px 0}input,select,textarea{width:100%;border:1px solid #d7ded9;background:#fff;border-radius:10px;padding:12px;margin-top:6px;color:var(--ink)}textarea{resize:vertical;line-height:1.6}.check{font-weight:600!important}.check input{width:auto;margin-right:6px}.revision{border-left:2px solid #cbd8cf;padding:2px 0 2px 12px;margin:14px 0}.revision p{font-size:13px;line-height:1.7;white-space:pre-wrap}.revision small{font-size:10px;color:var(--sub)}.tag{display:inline-block;border-radius:99px;padding:3px 7px;background:#edf3ef;font-size:9px;font-weight:900}.profile-card{display:flex;gap:12px;align-items:center;padding:22px 0}.profile-avatar{width:46px;height:46px;border-radius:50%;background:#e7f3ea;color:var(--green);display:grid;place-items:center;font-weight:900}.profile-card strong{display:block}.profile-card small{display:block;font-size:10px;color:var(--sub);margin-top:2px}.contrib-stats{display:grid;grid-template-columns:repeat(3,1fr);background:#fff;border:1px solid var(--border);border-radius:16px}.contrib-stats div{padding:18px;text-align:center}.contrib-stats div+div{border-left:1px solid var(--border)}.contrib-stats strong{display:block;font-size:24px}.contrib-stats span{font-size:10px;color:var(--sub)}.settings-list{margin:18px 0;background:#fff;border:1px solid var(--border);border-radius:16px;overflow:hidden}.settings-list button{width:100%;border:0;background:#fff;padding:15px 16px;display:flex;justify-content:space-between;border-bottom:1px solid var(--border);font-size:13px}.settings-list button:last-child{border-bottom:0}
.bottom{position:fixed;bottom:0;left:0;right:0;height:68px;padding-bottom:env(safe-area-inset-bottom);background:rgba(255,255,255,.97);border-top:1px solid var(--border);display:grid;grid-template-columns:repeat(4,1fr);z-index:20}.bottom button{border:0;background:none;font-size:10px;color:#667069;font-weight:750;display:grid;place-items:center;align-content:center;gap:3px}.bottom button span{font-size:16px;color:#334039}.toast{position:fixed;z-index:50;left:50%;bottom:82px;transform:translateX(-50%);background:#18211c;color:#fff;padding:11px 15px;border-radius:10px;font-size:12px;box-shadow:0 8px 28px rgba(0,0,0,.15)}
@media(min-width:760px){.shell{padding-top:10px}.bottom{left:50%;right:auto;transform:translateX(-50%);width:720px;border-left:1px solid var(--border);border-right:1px solid var(--border)}body{background:#eef1ef}.shell,.topin{background:var(--paper)}.topin{box-shadow:0 0 0 1px rgba(0,0,0,.02)}}
@media(max-width:430px){.welcome h1{font-size:29px}.card-row{grid-template-columns:1fr}.menu-grid{gap:8px}.today-card strong{font-size:18px}.login-copy{display:none}.line-login{padding:7px}.question-stage h3{font-size:18px}}

.archive-note{font-size:12px;color:#66766d;margin:8px 0 12px;line-height:1.6}

/* v1.4.1: exam labels must form independent rows, including on iOS Safari. */
#examBody .question{padding:22px 0 14px;min-width:0}
#examBody .question h3{font-size:18px;line-height:1.75;margin:0 0 20px;overflow-wrap:anywhere}
#examBody label.choice{display:grid;grid-template-columns:22px minmax(0,1fr);align-items:start;gap:12px;width:100%;margin:10px 0;padding:16px;border-radius:12px;white-space:normal;overflow-wrap:anywhere;cursor:pointer}
#examBody label.choice input[type="radio"]{appearance:auto;-webkit-appearance:radio;display:block;width:22px!important;height:22px;min-width:22px;padding:0;margin:2px 0 0!important;accent-color:var(--green)}
#examBody label.choice:has(input:checked){border-color:var(--green);background:var(--soft)}
#examBody label.choice:focus-within{outline:2px solid var(--green);outline-offset:2px}
#examNext{display:block;width:100%;margin-top:18px;min-height:48px}
#examBody>.progress{height:4px;background:var(--border)}
#examBody>.progress>div{height:100%;background:var(--green)}