:root{--ink:#3a2e4d;--muted:#6a5c7d;--accent:#6b46c1;--accent-dark:#5a37ad;--soft:#f1e9ff;--line:#e4d7f5;--bg:#fcf8ff;--gold:#8a5200;--cream:#fff4d9;--rainbow:linear-gradient(90deg,#ffb3c7,#ffd9a8,#fff0a3,#bdecc4,#a9dcf5,#c9b8f5,#f3b3e0)}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.7 'M PLUS Rounded 1c','Segoe UI','Yu Gothic UI',Meiryo,sans-serif}button,select,input{font:inherit}button{cursor:pointer}button:disabled{cursor:default}button,a,select,input{outline-offset:4px}aside{position:fixed;width:245px;background:#fff;height:100vh;border-right:1px solid var(--line);padding:37px 22px}.brand{display:flex;gap:12px;align-items:center;font-size:21px;font-weight:750}.logo{display:grid;place-items:center;background:var(--accent);color:white;width:45px;height:48px;border-radius:13px;font-size:25px}.brand small{display:block;font-size:10px;letter-spacing:2.8px;color:var(--muted)}.navlabel{font-size:10px;letter-spacing:2px;color:var(--muted);margin:50px 14px 16px}nav button{display:block;width:100%;border:0;background:none;text-align:left;padding:14px 15px;margin:6px 0;border-radius:9px;color:#6a5c7d}nav button.active{background:#f1e9ff;color:var(--accent);font-weight:700}.sidebottom{position:absolute;bottom:30px;font-size:12px;color:var(--muted)}.sidebottom small{display:block;margin-top:10px}.dot{display:inline-block;width:7px;height:7px;border-radius:50%;background:#e86aa6}main{margin-left:245px;padding:0 5vw 28px;max-width:1530px}header{display:flex;justify-content:space-between;padding:24px 0;border-bottom:1px solid var(--line);font-size:12px;color:var(--muted)}h1{font-size:30px;letter-spacing:.02em;line-height:1.4;margin:9px 0}h2{font-size:19px;margin:0 0 14px}p{margin:8px 0}.eyebrow{font-size:11px;letter-spacing:2px;color:var(--accent);font-weight:700}.intro{margin:30px 0 24px}.muted{color:var(--muted)}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:24px}.stat{padding:19px 24px;background:#fff;border:1px solid var(--line);border-radius:12px;font-size:12px;color:var(--muted)}.stat b{display:block;font-size:31px;line-height:1.5;color:var(--ink)}.stat b small{font-size:13px;font-weight:400;margin-left:6px}.hero{background:linear-gradient(135deg,#e9defd 0%,#fbe3ef 55%,#fff1d8 100%);border-radius:16px;color:var(--ink);padding:30px 34px;display:flex;align-items:center;justify-content:space-between;gap:25px;position:relative;overflow:hidden}.hero p{color:#55476a;font-size:13px}.hero h2{font-size:24px;margin:8px 0}.hero .eyebrow{color:var(--accent)}.hero .primary{white-space:nowrap}.primary,.secondary{padding:11px 22px;border:0;border-radius:8px;font-weight:650}.primary{background:var(--accent);color:white}.primary:disabled{opacity:.4}.secondary{background:#fff;border:1px solid var(--line);color:var(--ink)}.sectionhead{display:flex;align-items:center;justify-content:space-between;margin:30px 0 15px}.sectionhead h2{margin:0}.sectionhead span{font-size:12px;color:var(--muted)}.grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.card{background:white;border:1px solid var(--line);border-radius:12px;padding:23px}.cardtop{display:flex;justify-content:space-between;align-items:center}.number{font-size:12px;color:var(--gold);letter-spacing:2px}.card h3{font-size:18px;margin:7px 0}.card p{font-size:12px;color:var(--muted)}.bar{height:5px;background:#efe6fb;border-radius:6px;overflow:hidden;margin:16px 0 9px}.bar span{display:block;height:100%;background:#e86aa6}.card button{border:0;background:none;color:var(--accent);font-weight:700;padding:0}.tools{display:flex;gap:10px;flex-wrap:wrap;margin:25px 0}.tools button{font-size:12px}.chip{background:#f1e9ff;border-radius:5px;padding:4px 9px;font-size:12px;color:var(--accent)}.quiz{max-width:900px;margin:30px auto}.qhead{display:flex;justify-content:space-between;align-items:center;gap:12px}.option{display:flex;align-items:center;gap:14px;width:100%;padding:17px 20px;margin:11px 0;border:1px solid var(--line);border-radius:10px;background:white;text-align:left;color:var(--ink)}.option .option-number{flex-shrink:0;width:29px;height:29px;display:grid;place-items:center;background:#f1e9ff;border-radius:7px;font-size:13px}.option.selected{border:2px solid var(--accent);background:#f1e9ff;padding:16px 19px}.option.correct{border:2px solid #1f8a5b;background:#eaf7f0;padding:16px 19px}.option.incorrect{border:2px solid #b42318;background:#fdf0ee;padding:16px 19px}.feedback{margin-top:22px;padding:22px;background:#eaf7f0;border-left:4px solid #1f8a5b;border-radius:8px}.feedback.bad{background:#fdf0ee;border-color:#b42318}.feedback h3{margin:0 0 8px}.actions{display:flex;justify-content:space-between;gap:10px;align-items:center;margin-top:24px}.empty{text-align:center;padding:70px 20px;background:white;border:1px solid var(--line);border-radius:12px}.score{font-size:65px;color:var(--accent);font-weight:750}.score small{font-size:20px}input[type=search],select{border:1px solid var(--line);border-radius:8px;padding:10px 13px;background:white;color:var(--ink)}input[type=search]{min-width:240px;flex:1}footer{font-size:11px;color:var(--muted);margin-top:35px;padding-top:18px;border-top:1px solid var(--line)}footer a{color:var(--accent)}#notice:not(:empty){background:#fff4d9;padding:12px;margin:15px 0;border-radius:8px}.result{text-align:center;padding:35px}.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}@media(max-width:850px){aside{position:static;width:auto;height:auto;padding:15px}.brand{font-size:18px}.navlabel,.sidebottom{display:none}nav{display:flex;flex-wrap:wrap;margin-top:12px}nav button{width:auto;font-size:12px;padding:8px}main{margin:0;padding:0 20px 25px}.hero{padding:24px;flex-wrap:wrap}.stats{gap:9px}.stat{padding:12px}.grid{grid-template-columns:1fr}h1{font-size:25px}header{font-size:10px}.actions{flex-wrap:wrap}}@media(prefers-reduced-motion:no-preference){button{transition:background .15s,transform .15s}button:not(:disabled):hover{filter:brightness(.97);transform:translateY(-1px)}}

/* Mobile and touch layout; desktop styles above are retained. */
html{scroll-padding-bottom:170px}body{-webkit-text-size-adjust:100%;overflow-wrap:anywhere}
button{touch-action:manipulation;min-height:44px}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #6b46c1}
nav button{display:flex;align-items:center;gap:12px}.navicon{font-size:21px;line-height:1}
.option{min-height:64px;align-items:flex-start;line-height:1.8}.option .option-text{display:block;flex:1;min-width:0;text-align:left}.option:disabled{opacity:1;-webkit-text-fill-color:currentColor}
.qhead>span:last-child{flex-shrink:0}.feedback{scroll-margin-top:16px}
.card button{min-height:44px;padding:8px 6px}.tools input,.tools select{min-height:48px;font-size:16px}.tools input{min-width:0}
@media(max-width:850px){
 :root{--bottom-nav:68px}
 aside{padding:14px 20px;border-right:0;border-bottom:1px solid var(--line);background:#fff}
 .brand{font-size:19px;gap:10px}.brand small{font-size:9px;letter-spacing:2px}.logo{width:38px;height:40px;font-size:22px;border-radius:10px}
 nav{position:fixed;bottom:0;left:0;right:0;z-index:30;display:grid;grid-auto-flow:column;grid-auto-columns:minmax(0,1fr);gap:4px;height:calc(var(--bottom-nav) + env(safe-area-inset-bottom,0px));margin:0;padding:6px max(8px,env(safe-area-inset-right,0px)) calc(6px + env(safe-area-inset-bottom,0px)) max(8px,env(safe-area-inset-left,0px));border-top:1px solid var(--line);background:#fff;box-shadow:0 -3px 20px #5a3e9a14}
 nav button{display:flex;flex-direction:column;justify-content:center;align-items:center;width:100%;min-width:0;min-height:54px;gap:4px;margin:0;padding:6px 2px;text-align:center;font-size:11px;line-height:1.3;border-radius:8px;color:#6a5c7d}
 nav .navicon{font-size:22px}nav button.active{background:#f1e9ff}
 main{padding:0 max(20px,env(safe-area-inset-right,0px)) calc(var(--bottom-nav) + 24px + env(safe-area-inset-bottom,0px)) max(20px,env(safe-area-inset-left,0px));width:100%}
 header{gap:10px;padding:13px 0;font-size:11px}header>span:first-child{max-width:60%}header #date{text-align:right}
 .intro{margin:24px 0 20px}.intro h1{font-size:clamp(23px,4vw,29px);line-height:1.55}.intro p{font-size:14px}
 .stats{gap:10px;margin-bottom:20px}.stat{padding:14px 12px;font-size:12px}.stat b{font-size:29px}
 .hero{display:block;padding:24px;border-radius:14px}.hero h2{font-size:23px;line-height:1.5}.hero .primary{margin-top:16px;width:100%;min-height:50px}.hero p{font-size:14px}
 .grid{grid-template-columns:repeat(2,minmax(0,1fr))}.card{padding:20px}.cardtop{gap:8px}.cardtop small{font-size:12px}.cardtop button{white-space:nowrap}
 .sectionhead{gap:12px;margin-top:25px}.sectionhead h2{font-size:19px}.sectionhead>span{font-size:11px;text-align:right}
 .tools{gap:10px}.tools button{min-height:48px;font-size:14px}.tools input{flex-basis:100%;width:100%}.tools select{flex:1;min-width:0}
 .quiz{margin:22px auto}.qhead{gap:8px}.qhead .eyebrow{letter-spacing:1px;font-size:11px}.qhead>.muted{font-size:13px}.chip{font-size:12px}

 .option{padding:16px;gap:12px;font-size:16px;border-radius:12px}.option.selected,.option.correct,.option.incorrect{padding:15px}.option .option-number{margin-top:1px}
 .actions{position:sticky;bottom:calc(var(--bottom-nav) + env(safe-area-inset-bottom,0px));z-index:20;display:grid;grid-template-columns:auto minmax(0,1fr);gap:8px 12px;align-items:center;margin:24px -4px 0;padding:12px 4px;background:var(--bg);border-top:1px solid var(--line);box-shadow:0 -8px 18px #fcf8ff}
 .actions>.muted{grid-column:1/-1;grid-row:1;text-align:center;font-size:12px}.actions button{min-height:50px;font-size:15px;padding:11px 16px}.actions #quit{font-size:13px}
 .feedback{padding:20px;font-size:16px;line-height:1.85}.feedback h3{font-size:18px}
 .result{padding:30px 20px}.result h1{font-size:25px}.result .tools{flex-direction:column}.score{font-size:58px}
 footer{font-size:12px;line-height:1.85;padding-top:18px;margin-top:26px}

}
@media(max-width:600px){
 .grid{grid-template-columns:1fr}.tools>#review{flex-basis:100%}.tools>#export,.tools>#restore{flex:1;padding:11px 8px;font-size:13px}

}
@media(max-width:374px){
 aside{padding:12px 14px}main{padding-left:max(14px,env(safe-area-inset-left,0px));padding-right:max(14px,env(safe-area-inset-right,0px))}
 .stats{gap:6px}.stat{padding:12px 8px;font-size:11px}.stat b{font-size:25px}.stat b small{font-size:11px;margin-left:3px}
 .hero{padding:20px}.hero h2{font-size:21px}.option{gap:10px;padding:14px}.option.selected,.option.correct,.option.incorrect{padding:13px}.qhead .chip{max-width:66%}
 .sectionhead h2{font-size:18px}
}
@media(hover:none){button:not(:disabled):hover{transform:none;filter:none}}

/* 問題演習の一覧・50問演習 */
.mini-hero{display:flex;align-items:center;justify-content:space-between;gap:20px;margin:0 0 18px;padding:20px 24px;background:#fff;border:1px solid var(--line);border-radius:12px}.mini-hero strong,.mini-hero span{display:block}.mini-hero span{font-size:13px;color:var(--muted);margin-top:3px}

.drill-tools{align-items:center}.drill-tools .muted{margin-left:auto}.drill-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.drill-card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:21px}.drill-card h2{font-size:18px;margin:10px 0 4px}.drill-card p{color:var(--muted);font-size:13px;min-height:23px}.drill-card-actions{display:flex;gap:9px;margin-top:15px}.drill-card-actions>*{flex:1;text-align:center}.back-link{border:0;background:transparent;color:var(--accent);font-weight:650;padding:10px 0;margin:10px 0}.drill-result{display:flex;align-items:center;gap:24px;margin:20px 0;padding:20px 24px;background:linear-gradient(135deg,#e9defd,#fbe3ef);color:var(--ink);border-radius:13px}.drill-result div span{display:block;font-size:12px;color:#55476a}.drill-result div strong{font-size:38px;line-height:1.2}.drill-result small{font-size:15px}.drill-result p{color:#55476a}.exam-submit{position:sticky;bottom:10px;z-index:18;display:flex;align-items:center;gap:10px;margin:24px 0;padding:14px 16px;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:0 8px 30px #5a3e9a2e}.exam-submit>div{margin-right:auto}.exam-submit span{display:block;color:var(--muted);font-size:12px}.exam-submit button{min-width:130px}

@media(max-width:850px){
 :root{--bottom-nav:72px}.drill-grid{grid-template-columns:1fr}.mini-hero{padding:18px}.mini-hero .primary{flex-shrink:0}nav{padding-left:4px;padding-right:4px}nav button{font-size:10px}.exam-submit{bottom:calc(var(--bottom-nav) + env(safe-area-inset-bottom,0px));display:grid;grid-template-columns:1fr 1fr;padding:12px;margin-left:-4px;margin-right:-4px}.exam-submit>div{grid-column:1/-1;margin:0;text-align:center}.exam-submit button{min-width:0;min-height:50px}.drill-result{align-items:flex-start;flex-direction:column;gap:7px}.drill-result p{margin:0}.drill-tools .muted{width:100%;margin:0}.drill-card p{min-height:0}
}
@media(max-width:600px){.mini-hero{display:block}.mini-hero .primary{width:100%;margin-top:12px}.drill-card-actions{flex-direction:column}.drill-result div strong{font-size:34px}}
@media(max-width:360px){nav button{font-size:9px}.navicon{font-size:19px!important}}

.scoring-note{font-size:12px;line-height:1.8}

.q-prompt{font-size:19px;line-height:1.95;white-space:pre-line;margin:24px 0;overflow-wrap:anywhere}.question-navigation{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap;margin:20px 0}.answer-overview summary{cursor:pointer;min-height:44px;padding:10px 0;color:var(--accent)}.exam-view .option-text{white-space:pre-line;line-height:1.85}.q-number{font-size:22px}.answer-map{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:8px}.answer-map button{min-width:0;padding:10px 3px}.answer-map small{display:block;font-size:11px}.map-correct{background:#e3f4ea!important}.map-wrong{background:#fdebe8!important}.exam-view .exam-submit{margin-top:30px}.exam-view .qhead h1{font-size:25px}.question-navigation select{min-height:44px}.question-navigation button{min-height:44px}@media(max-width:600px){.q-prompt{font-size:17px;line-height:1.9}.exam-view .qhead{flex-wrap:wrap}.answer-map{grid-template-columns:repeat(4,minmax(0,1fr))}.question-navigation{gap:8px}.question-navigation button{font-size:12px;padding:10px}.exam-view .option{align-items:flex-start}.exam-view .option-text{font-size:15px}}
.option-text{min-width:0;width:100%}.exam-view .exam-submit{position:static;box-shadow:none}
.explain{margin:22px 0;border:1px solid var(--line);border-radius:10px;background:#fff}.explain>summary{cursor:pointer;min-height:44px;padding:13px 18px;color:var(--accent);font-weight:700}.explain-body{padding:0 18px 18px;border-top:1px solid var(--line)}.explain-summary{margin:16px 0;line-height:1.9}@media(max-width:600px){.explain-body{padding:0 13px 15px}.explain-summary{font-size:15px}}

/* サイドバーの折りたたみ（#navToggle・body.nav-collapsed）と広告掲載欄（.ad-slot） */
#navToggle{position:absolute;top:10px;right:10px;width:30px;height:30px;border:1px solid var(--line);background:#fff;border-radius:8px;color:var(--muted);font-size:14px;line-height:1;padding:0}
aside{transition:width .15s ease;}
main{transition:margin-left .15s ease;}
body.nav-collapsed aside{width:76px;padding:37px 13px}
body.nav-collapsed main{margin-left:76px}
body.nav-collapsed .brand-text,body.nav-collapsed .navlabel,body.nav-collapsed .navtext,body.nav-collapsed .sidebottom{display:none}
body.nav-collapsed .brand{justify-content:center}
body.nav-collapsed nav button{text-align:center;padding:14px 0}
body.nav-collapsed nav button .navicon{margin:0}
body.nav-collapsed #navToggle{right:23px}
@media(max-width:850px){#navToggle{display:none}body.nav-collapsed aside{width:auto;padding:15px}body.nav-collapsed main{margin:0}body.nav-collapsed .brand-text{display:block}body.nav-collapsed .navtext{display:inline}}
.ad-slot{margin-top:35px;border:1px dashed var(--line);border-radius:12px;background:#fff;padding:14px 18px;text-align:center}
.ad-label{display:inline-block;font-size:10px;letter-spacing:2px;color:var(--muted);border:1px solid var(--line);border-radius:4px;padding:1px 8px;margin-bottom:8px}
.ad-content{min-height:60px;display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:10px}
.ad-content img{max-width:100%;height:auto}

/* アフィリエイトリンク（楽天） */
.ad-link { display:inline-block; padding:10px 22px; border:1.5px solid #bf0000; color:#bf0000; border-radius:10px; text-decoration:none; font-weight:600; font-size:14.5px; }
.ad-link:hover { background:#bf0000; color:#fff; }

/* 未ログイン時のナビ（ランディング以外のボタンを隠す） */
nav button[hidden]{display:none!important}

/* 料金プラン（3段階） */
.plan-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); align-items: stretch; }
.plan-card { display: flex; flex-direction: column; }
.plan-card.is-current { border-color: var(--accent); box-shadow: 0 0 0 2px rgba(107, 70, 193, .2); }
.plan-price { font-size: 38px; font-weight: 700; color: var(--accent); line-height: 1.2; margin: 6px 0 10px; font-variant-numeric: tabular-nums; }
.plan-price small { display: block; font-size: 13px; font-weight: 400; color: var(--muted); margin-top: 2px; }
.plan-card p { font-size: 14px; line-height: 2; flex: 1; }
.plan-action { margin-top: 14px; }
.card .plan-action .primary { width: 100%; background: var(--accent); color: #fff; padding: 12px 14px; border-radius: 8px; font-weight: 700; min-height: 46px; }
.card.plan-notes .secondary { background: #f1e9ff; color: var(--ink); padding: 11px 22px; border-radius: 8px; font-weight: 650; }
.plan-notes { margin-top: 22px; }
.plan-notes p { font-size: 13.5px; line-height: 2; color: var(--muted); }
.plan-notes strong { color: var(--ink); }
@media (max-width: 1000px) { .plan-grid { grid-template-columns: 1fr; } }

/* 分野の表示と図版（問題文の下のインライン SVG。スマホ幅でも横にはみ出さない） */
.q-topic{margin:20px 0 0}
.q-topic+.q-prompt{margin-top:10px}
.q-visual{margin:0 0 22px;padding:10px;background:#fff;border:1px solid var(--line);border-radius:10px;overflow:hidden}
.q-visual svg{display:block;width:100%;max-width:560px;height:auto;margin:0 auto}
.explain-answer{display:flex;gap:12px;align-items:flex-start;margin:16px 0 0;padding:12px 13px;border-radius:8px;background:#eaf7f0;line-height:1.85}
.explain-num{flex-shrink:0;width:26px;height:26px;display:grid;place-items:center;background:#c9ead8;color:#176043;border-radius:7px;font-size:13px;font-weight:700}

/* ホーム: ランダム10問の級・分野の選択と、級別カード */
.draw-options{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
.draw-options select{min-height:44px;font-size:16px;max-width:100%}
.grade-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
@media(max-width:1000px){.grade-grid{grid-template-columns:1fr}}

/* アプリ名（8 文字）がサイドバーで折り返さない大きさにする */
.brand{font-size:17px}.brand-text{white-space:nowrap}
.mini-hero .primary{flex-shrink:0}
.grid+.hero{margin-top:24px}

/* カードの中でも .primary / .secondary はボタンの見た目を保つ（上の .card button〔文字だけのボタン〕より優先させる） */
.card .primary{background:var(--accent);color:#fff;padding:11px 22px;border-radius:8px;font-weight:650}
.card .secondary{background:#fff;border:1px solid var(--line);color:var(--ink);padding:11px 22px;border-radius:8px;font-weight:650}
.cardtop button{white-space:nowrap;flex-shrink:0}
@media(max-width:600px){.draw-options select{flex:1 1 100%}}

/* ===== メルヘン調のテーマ（2026-09-30 稲木さん指示「少しメルヘンにかわいい感じ」） =====
   パステル（ラベンダー・ミルキーピンク・ミント・クリーム）、大きめの角丸、丸い書体（M PLUS Rounded 1c。読めないときはシステム書体）。
   学習の画面（問題文・選択肢・解説・図版）は読みやすさ優先で、飾りを重ねない。
   文字は濃い色（--ink #3a2e4d／--muted #6a5c7d／--accent #6b46c1）のまま、背景とのコントラスト比 4.5:1 以上。主ボタンは --accent に白文字（6.4:1）。
   正解・不正解は緑系・赤系のまま。 */

/* 書体は少し太め（丸い書体は細く見えるため。システム書体に落ちたときは標準の太さのまま） */
body{font-weight:500}

/* 虹の帯（画面のいちばん上） */
body::before{content:"";position:fixed;top:0;left:0;right:0;height:5px;background:var(--rainbow);z-index:40}

/* ロゴ: パステルの色相環に「色」 */
.logo{width:46px;height:46px;border-radius:50%;background:radial-gradient(circle,#fff 0 60%,transparent 61%),conic-gradient(#ffb3c7,#ffd9a8,#fff0a3,#bdecc4,#a9dcf5,#c9b8f5,#f3b3e0,#ffb3c7);color:var(--accent);font-size:21px;font-weight:700;box-shadow:0 3px 10px #5a3e9a1f}
.brand{font-size:16px;gap:10px}.brand small{color:var(--muted)}

/* ナビ（アイコンはインライン SVG） */
.navicon{display:inline-grid;place-items:center}
.navicon svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
nav button{border-radius:999px}
nav button.active{background:var(--soft);color:var(--accent)}
/* たたむボタンは、アプリ名に重ならないようサイドバーの縁に出す */
#navToggle,body.nav-collapsed #navToggle{border-radius:50%;right:-15px;top:24px;z-index:5;box-shadow:0 2px 8px #5a3e9a1a}
body.nav-collapsed nav button{justify-content:center}
.dot{background:#e86aa6}
header{border-bottom:2px dotted var(--line)}

/* 見出しの小さな飾り（星・花・虹の粒） */
.eyebrow::before{content:"";display:inline-block;width:11px;height:11px;margin-right:6px;vertical-align:-1px;background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='%23f59ac0' d='M12 1c.9 5.9 5.1 10.1 11 11-5.9.9-10.1 5.1-11 11-.9-5.9-5.1-10.1-11-11 5.9-.9 10.1-5.1 11-11z'/%3E%3C/svg%3E") center/contain no-repeat}
.sectionhead h2::before{content:"";display:inline-block;width:16px;height:16px;margin-right:8px;vertical-align:-2px;background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cg fill='%23f59ac0'%3E%3Ccircle cx='12' cy='5.5' r='4.5'/%3E%3Ccircle cx='18.2' cy='10' r='4.5'/%3E%3Ccircle cx='15.8' cy='17.3' r='4.5'/%3E%3Ccircle cx='8.2' cy='17.3' r='4.5'/%3E%3Ccircle cx='5.8' cy='10' r='4.5'/%3E%3C/g%3E%3Ccircle cx='12' cy='12' r='3.6' fill='%23ffe08a'/%3E%3C/svg%3E") center/contain no-repeat}
.intro::after{content:"";display:block;grid-column:1;width:118px;height:10px;margin-top:14px;background:radial-gradient(circle at 5px 5px,#ffb3c7 4.5px,transparent 5px),radial-gradient(circle at 23px 5px,#ffd9a8 4.5px,transparent 5px),radial-gradient(circle at 41px 5px,#fff0a3 4.5px,transparent 5px),radial-gradient(circle at 59px 5px,#bdecc4 4.5px,transparent 5px),radial-gradient(circle at 77px 5px,#a9dcf5 4.5px,transparent 5px),radial-gradient(circle at 95px 5px,#c9b8f5 4.5px,transparent 5px),radial-gradient(circle at 113px 5px,#f3b3e0 4.5px,transparent 5px)}
.intro{display:grid;grid-template-columns:minmax(0,1fr) auto;column-gap:24px;align-items:center}
.intro>*{grid-column:1}
.intro>.intro-art{grid-column:2;grid-row:1/span 4;width:168px;height:auto}

/* カード・ボタン・入力の角丸と、やわらかい影 */
.stats{grid-template-columns:repeat(3,minmax(0,1fr))}.stat b{white-space:nowrap}
.card,.stat,.mini-hero,.drill-card,.empty,.explain,.ad-slot,.exam-submit{border-radius:20px;border:1.5px solid var(--line);box-shadow:0 6px 18px #5a3e9a0f}
.ad-slot{border-style:dashed;box-shadow:none}
.hero,.drill-result{border-radius:24px}
.hero{box-shadow:0 8px 22px #5a3e9a1a}
.hero::after{content:"";position:absolute;right:26px;top:14px;width:64px;height:36px;background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 64 36'%3E%3Cpath fill='%23ffffff' fill-opacity='.85' d='M14 34a10 10 0 0 1-1.5-19.9A14 14 0 0 1 39 9.5 11 11 0 0 1 56 19a8 8 0 0 1-3 15z'/%3E%3C/svg%3E") center/contain no-repeat;pointer-events:none}
.hero::before{content:"";position:absolute;right:98px;top:20px;width:14px;height:14px;background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='%23ffffff' d='M12 1c.9 5.9 5.1 10.1 11 11-5.9.9-10.1 5.1-11 11-.9-5.9-5.1-10.1-11-11 5.9-.9 10.1-5.1 11-11z'/%3E%3C/svg%3E") center/contain no-repeat;pointer-events:none}
.primary,.secondary,.card .primary,.card .secondary,.card .plan-action .primary,.card.plan-notes .secondary{border-radius:999px}
.primary,.card .primary{box-shadow:0 4px 12px #6b46c133}
.primary:not(:disabled):hover,.card .primary:not(:disabled):hover{background:var(--accent-dark);filter:none}
.secondary,.card .secondary{border:1.5px solid var(--line)}
.chip{border-radius:999px;background:var(--soft);padding:4px 12px}
.number{display:inline-block;background:var(--cream);color:var(--gold);border-radius:999px;padding:3px 11px;font-size:11px;font-weight:700;letter-spacing:1.5px}
input[type=search],select,input[type=email],#loginOtp{border:1.5px solid var(--line);border-radius:14px}
#notice:not(:empty){border-radius:16px;border:1.5px solid #f3dfa6}
.bar{height:8px;border-radius:99px}
.bar span{background:linear-gradient(90deg,#c9b8f5,#f5a3c7);border-radius:99px}
.score,.plan-price{color:var(--accent)}
.plan-card.is-current{border-color:var(--accent)}
footer{border-top:2px dotted var(--line)}
.ad-link{border-radius:999px}

/* 学習の画面: 角を丸くするだけで、飾りは置かない */
.option{border:1.5px solid #d5c4ee;border-radius:18px}
.option .option-number{border-radius:50%;background:var(--soft);color:var(--ink);font-weight:700}
.option.selected{border-color:var(--accent);background:#f6f0ff}
.feedback{border-radius:16px}
.q-visual{border-radius:18px;border:1.5px solid var(--line)}
.answer-map button{border-radius:14px}
.explain-answer{border-radius:14px}
.explain-num{border-radius:50%}
.result h1::after{content:"";display:block;width:118px;height:10px;margin:12px auto 0;background:radial-gradient(circle at 5px 5px,#ffb3c7 4.5px,transparent 5px),radial-gradient(circle at 23px 5px,#ffd9a8 4.5px,transparent 5px),radial-gradient(circle at 41px 5px,#fff0a3 4.5px,transparent 5px),radial-gradient(circle at 59px 5px,#bdecc4 4.5px,transparent 5px),radial-gradient(circle at 77px 5px,#a9dcf5 4.5px,transparent 5px),radial-gradient(circle at 95px 5px,#c9b8f5 4.5px,transparent 5px),radial-gradient(circle at 113px 5px,#f3b3e0 4.5px,transparent 5px)}

@media(max-width:850px){
 aside{border-bottom:0;box-shadow:0 2px 12px #5a3e9a0f}
 .logo{width:40px;height:40px;font-size:19px}
 nav{border-top:1.5px solid var(--line);border-radius:20px 20px 0 0;box-shadow:0 -4px 18px #5a3e9a14}
 nav button{border-radius:16px}
 .hero::before,.hero::after{display:none}
 .option{border-radius:16px}
}
@media(max-width:600px){
 .intro{grid-template-columns:minmax(0,1fr)}
 .intro>.intro-art{grid-column:1;grid-row:auto;order:-1;width:92px;margin:0 0 6px}
 .stat{padding:14px 10px}.stat b{font-size:24px}.stat b small{font-size:11px;margin-left:3px}
 .ad-link{font-size:12.5px;padding:10px 14px}
}

/* プラン画面の級タブ（3級／2級／1級）、アカウント画面のプラン一覧、開発用の級ごとの切替 */
.grade-tabs{display:flex;gap:8px;width:fit-content;max-width:100%;margin:0 0 18px;padding:6px;background:#fff;border:1.5px solid var(--line);border-radius:999px}
.grade-tabs button{display:flex;flex-direction:column;align-items:center;justify-content:center;min-width:96px;min-height:48px;padding:6px 18px;border:0;border-radius:999px;background:none;color:var(--muted);font-size:16px;font-weight:700;line-height:1.3}
.grade-tabs button small{font-size:10.5px;font-weight:500}
.grade-tabs button.active{background:var(--accent);color:#fff}
.plan-chips{display:flex;flex-wrap:wrap;gap:6px;justify-content:center}
.dev-plans{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin:18px 0;padding:12px;border:1.5px dashed var(--line);border-radius:16px;font-size:13px}
.dev-plans select{min-height:40px;font-size:14px;padding:6px 10px}
@media(max-width:600px){.grade-tabs{width:100%}.grade-tabs button{flex:1;min-width:0;padding:6px 4px}}
.cardtop .number,.cardtop .chip{white-space:nowrap;flex-shrink:0}