:root{
  --primary:#0F2C5C;--primary-soft:#2E6FDB;--secondary:#1A3A7A;--accent:#00C2A8;--accent-soft:#00E0C7;
  --bg:#FAFBFC;--bg-soft:#F0F4F9;--border:#E1E5EB;--text:#1A2235;--text-soft:#5B6478;--text-heading:#153451;
  --danger:#FF5252;--success:#2E7D32;--warning:#FF9F1C;
  --font-jp:'Noto Sans JP','Hiragino Sans','Yu Gothic',sans-serif;--font-en:'Inter',-apple-system,BlinkMacSystemFont,sans-serif;
  --radius-sm:8px;--radius-md:14px;--radius-lg:20px;
  --shadow-sm:0 2px 6px rgba(15,44,92,.08);--shadow-md:0 6px 18px rgba(15,44,92,.12);
  --math:#2E6FDB;--ja:#D9534F;--sci:#2E7D32;--soc:#B8860B;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--font-jp);background:var(--bg);color:var(--text);line-height:1.75;font-size:16px}
a{color:var(--primary-soft)}
.topbar{position:sticky;top:0;z-index:10;background:#fff;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;padding:10px 16px;gap:12px}
.brand{display:flex;align-items:center;gap:8px;text-decoration:none;color:var(--primary);font-family:var(--font-en);font-weight:700;font-size:1.05rem}
.brand-mark{display:inline-flex;width:30px;height:30px;border-radius:9px;background:linear-gradient(135deg,var(--primary),var(--primary-soft));color:#fff;align-items:center;justify-content:center;font-weight:800}
.brand b{font-weight:800}
.beta{font-size:.65rem;background:var(--accent);color:#fff;border-radius:999px;padding:1px 7px;font-weight:700}
.topnav{display:flex;gap:4px}
.topnav a{text-decoration:none;color:var(--text-soft);font-size:.9rem;font-weight:600;padding:6px 10px;border-radius:999px}
.topnav a.on{background:var(--bg-soft);color:var(--primary)}
.app{max-width:820px;margin:0 auto;padding:16px 16px 40px;min-height:70vh}
.foot{text-align:center;color:var(--text-soft);font-size:.85rem;padding:24px 16px;border-top:1px solid var(--border);background:#fff}
.foot .small{font-size:.75rem}
.foot a{color:var(--text-soft)}
h1{font-size:1.5rem;color:var(--text-heading);margin:8px 0 6px;line-height:1.35}
h2{font-size:1.15rem;color:var(--text-heading);margin:0 0 10px}
h3{font-size:1rem;margin:16px 0 6px;color:var(--text-heading)}
p{margin:6px 0 10px}
.card{background:#fff;border:1px solid var(--border);border-radius:var(--radius-md);padding:18px 16px;margin-bottom:14px;box-shadow:var(--shadow-sm)}
.muted{color:var(--text-soft);font-size:.9rem}
.small{font-size:.82rem}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:12px 18px;border-radius:var(--radius-sm);border:0;background:var(--primary);color:#fff;font-weight:700;font-size:1rem;cursor:pointer;text-decoration:none;font-family:inherit}
.btn:hover{background:var(--secondary)}
.btn.accent{background:var(--accent)}
.btn.ghost{background:#fff;color:var(--primary);border:1.5px solid var(--border)}
.btn.block{display:flex;width:100%}
.btn:disabled{opacity:.5;cursor:not-allowed}
.btn.sm{padding:8px 12px;font-size:.9rem}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media(max-width:560px){.grid2{grid-template-columns:1fr}}
/* dashboard */
.hero{background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;border-radius:var(--radius-lg);padding:20px 18px;margin-bottom:14px;box-shadow:var(--shadow-md)}
.hero .avatar{font-size:3rem;line-height:1}
.hero .lv{font-family:var(--font-en);font-weight:800;font-size:1.6rem}
.hero .title{opacity:.9;font-size:.9rem}
.xpbar{height:10px;background:rgba(255,255,255,.25);border-radius:999px;overflow:hidden;margin:8px 0 4px}
.xpbar i{display:block;height:100%;background:var(--accent-soft);border-radius:999px;transition:width .6s}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:10px}
.stat{background:rgba(255,255,255,.12);border-radius:var(--radius-sm);padding:8px;text-align:center}
.stat b{display:block;font-family:var(--font-en);font-size:1.2rem}
.stat span{font-size:.75rem;opacity:.85}
/* units */
.filters{display:flex;gap:6px;flex-wrap:wrap;margin:8px 0 12px}
.chip{padding:6px 12px;border-radius:999px;border:1.5px solid var(--border);background:#fff;font-size:.9rem;cursor:pointer;font-family:inherit;color:var(--text)}
.chip.on{background:var(--primary);color:#fff;border-color:var(--primary)}
.unit{display:flex;align-items:center;gap:12px;background:#fff;border:1px solid var(--border);border-radius:var(--radius-md);padding:12px 14px;margin-bottom:8px;text-decoration:none;color:inherit}
.unit:hover{box-shadow:var(--shadow-sm)}
.unit .tag{font-size:.72rem;font-weight:700;color:#fff;border-radius:6px;padding:2px 7px;white-space:nowrap}
.tag.math{background:var(--math)}.tag.ja{background:var(--ja)}.tag.sci{background:var(--sci)}.tag.soc{background:var(--soc)}
.unit .name{flex:1;font-weight:600}
.unit .meta{font-size:.78rem;color:var(--text-soft)}
.unit.soon{opacity:.55}
.unit .done{color:var(--success);font-weight:700;font-size:.85rem}
/* phases */
.phasebar{display:flex;gap:4px;margin:10px 0 14px}
.phasebar div{flex:1;height:8px;border-radius:999px;background:var(--border)}
.phasebar div.on{background:var(--primary-soft)}
.phasebar div.done{background:var(--accent)}
.phasehead{display:flex;justify-content:space-between;align-items:center;font-size:.85rem;color:var(--text-soft);margin-bottom:4px}
.timer{font-family:var(--font-en);font-weight:700;color:var(--primary)}
.lesson h3{border-left:4px solid var(--primary-soft);padding-left:10px}
.lesson .ex{background:var(--bg-soft);border-radius:var(--radius-sm);padding:12px 14px;margin:10px 0}
.lesson .ex b{color:var(--primary)}
.lesson table{border-collapse:collapse;width:100%;font-size:.95rem;margin:8px 0}
.lesson th,.lesson td{border:1px solid var(--border);padding:6px 8px;text-align:center}
.lesson ul{padding-left:20px}
.point{background:#FFF8E6;border:1px solid #F3D58A;border-radius:var(--radius-sm);padding:10px 12px;margin:10px 0}
/* drill */
.q{font-weight:600;font-size:1.05rem;margin:4px 0 10px}
.choices{display:grid;gap:8px}
.choice{text-align:left;padding:12px 14px;border:1.5px solid var(--border);border-radius:var(--radius-sm);background:#fff;font-size:1rem;cursor:pointer;font-family:inherit}
.choice:hover{border-color:var(--primary-soft)}
.choice.correct{border-color:var(--success);background:#EAF6EB}
.choice.wrong{border-color:var(--danger);background:#FFECEC}
.choice:disabled{cursor:default}
.feedback{margin-top:10px;padding:10px 12px;border-radius:var(--radius-sm);background:var(--bg-soft)}
.feedback.ok{background:#EAF6EB}
.feedback.ng{background:#FFF3F3}
.progress{font-size:.85rem;color:var(--text-soft)}
/* writing */
textarea{width:100%;min-height:150px;font-size:1rem;font-family:inherit;padding:12px;border:1.5px solid var(--border);border-radius:var(--radius-sm);line-height:1.7}
textarea:focus{outline:2px solid var(--primary-soft)}
.rubric{display:grid;gap:6px;margin:10px 0}
.rubric label{display:flex;gap:8px;align-items:flex-start;background:var(--bg-soft);border-radius:var(--radius-sm);padding:8px 10px;font-size:.95rem}
.score{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0}
.score .s{background:var(--bg-soft);border-radius:var(--radius-sm);padding:8px 10px;flex:1;min-width:140px}
.score .s b{color:var(--primary)}
.praise{background:#E6F8F5;border:1px solid #9FE5D8;border-radius:var(--radius-sm);padding:12px;margin:10px 0}
.loading{display:inline-block;width:18px;height:18px;border:3px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin 1s linear infinite;vertical-align:middle}
@keyframes spin{to{transform:rotate(360deg)}}
/* result */
.gain{font-family:var(--font-en);font-weight:800;font-size:2rem;color:var(--accent)}
.badge{display:inline-flex;align-items:center;gap:6px;background:var(--bg-soft);border-radius:999px;padding:6px 12px;margin:3px;font-size:.9rem}
.badge.lock{opacity:.4;filter:grayscale(1)}
.items{display:flex;flex-wrap:wrap;gap:6px}
.levelup{background:linear-gradient(135deg,#FFD166,#FF9F1C);color:#3b2a00;border-radius:var(--radius-md);padding:14px;text-align:center;font-weight:800;font-size:1.15rem;margin:10px 0;animation:pop .5s}
@keyframes pop{from{transform:scale(.9);opacity:0}to{transform:scale(1);opacity:1}}
input[type=text],select{font-size:1rem;padding:10px;border:1.5px solid var(--border);border-radius:var(--radius-sm);font-family:inherit;width:100%}
label.f{display:block;font-weight:600;margin:10px 0 4px;font-size:.9rem}
.note{font-size:.82rem;color:var(--text-soft)}
.kv{display:grid;grid-template-columns:auto 1fr;gap:4px 12px;font-size:.95rem}
.kv b{color:var(--text-soft);font-weight:600}
.history li{font-size:.9rem;margin:2px 0}
details{margin:8px 0}
summary{cursor:pointer;font-weight:600}
.center{text-align:center}

/* exam drill */
.exam-card{border-color:#C9D8F5;background:linear-gradient(180deg,#F5F8FF,#fff)}
.ansrow{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin:8px 0}
.ansin{flex:1;min-width:140px;font-size:1.15rem;padding:12px;border:1.5px solid var(--border);border-radius:var(--radius-sm);font-family:var(--font-en),var(--font-jp)}
.ansin:focus{outline:2px solid var(--primary-soft)}
.ansin.correct{border-color:var(--success);background:#EAF6EB}
.ansin.wrong{border-color:var(--danger);background:#FFECEC}
.ansrow .unit{font-weight:700;color:var(--text-soft)}
.exintro{background:#FFF8E6;border:1px solid #F3D58A;border-radius:var(--radius-sm);padding:8px 12px;margin:0 0 12px}
.exintro summary{color:#7a5a00}
.exintro .lesson{font-size:.92rem}
.exintro .lesson p{margin:4px 0}
.feedback .exp{margin-top:4px;font-size:.92rem}
.wrongq{border-top:1px solid var(--border);padding:8px 0;font-size:.95rem}
.wrongq .exp{font-size:.85rem}
/* figures & mock */
.fig{margin:4px 0 10px;text-align:center}
.fig svg{max-width:100%;height:auto;max-height:260px}
.fig.small svg{max-height:160px}
.tag.mix{background:var(--primary)}
/* 並べかえ */
.ordseq{margin:6px 0 12px;padding:0 0 0 1.6em;min-height:2em;border-left:3px solid var(--primary-soft)}
.ordseq li{padding:6px 10px;margin:4px 0;background:var(--bg-soft);border-radius:var(--radius-sm);font-size:.95rem}
.ordseq li.correct{background:#EAF6EB;border:1px solid var(--success)}
.ordseq li.wrong{background:#FFECEC;border:1px solid var(--danger)}
.ordseq li.muted{background:none;color:var(--text-soft);font-size:.85rem}
.rank{display:inline-block;font-family:var(--font-en);font-weight:800;font-size:1.6rem;padding:8px 22px;border-radius:999px;margin:6px 0;color:#fff;background:var(--text-soft)}
.rank-S{background:linear-gradient(135deg,#FFD166,#FF9F1C);color:#3b2a00}
.rank-A{background:var(--accent)}
.rank-B{background:var(--primary-soft)}
.rank-C{background:#8A94A6}
/* 読解の本文 */
.passage{background:#FBFBF7;border:1px solid var(--border);border-radius:var(--radius-sm);padding:10px 14px;margin:0 0 12px;line-height:1.9;font-size:.97rem;max-height:360px;overflow:auto}
.passage p{margin:0 0 6px}
.passage u{text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:2px}
/* ドリルマップ */
.heat{display:flex;flex-wrap:wrap;gap:4px}
.heat a{width:30px;height:22px;border-radius:4px;font-size:.62rem;display:flex;align-items:center;justify-content:center;color:#fff;text-decoration:none;font-family:var(--font-en)}
.heat .h0{background:#D5DCE8;color:#667}
.heat .h1{background:#E85D5D}
.heat .h2{background:#F2B33D}
.heat .h3{background:#2EAD6B}
/* 紙ふぶき */
.confetti{position:fixed;inset:0;pointer-events:none;overflow:hidden;z-index:50}
.confetti i{position:absolute;top:-14px;width:10px;height:14px;border-radius:2px;animation:fall linear forwards;opacity:.95}
@keyframes fall{to{transform:translateY(105vh) rotate(720deg);opacity:.7}}
/* 印刷（保護者レポート） */
@media print{.topbar,.topnav,footer,.noprint,.btn{display:none!important}body{background:#fff}.card{break-inside:avoid;box-shadow:none;border:1px solid #ccc}}
/* 最難関 */
.chip.hard.on{background:#5B2C83;border-color:#5B2C83}
.lvtag{color:#5B2C83}
.unit.hardset{border-left:4px solid #5B2C83}
/* きょうのやること・プラン・ガイド・ヒント */
.plancard{border-color:#BFD4F5;background:linear-gradient(180deg,#F5F8FF,#fff)}
.todo{list-style:none;padding:0;margin:6px 0}
.todo li{display:flex;align-items:center;gap:8px;flex-wrap:wrap;padding:8px 0;border-bottom:1px solid var(--border);font-size:.97rem}
.todo li:last-child{border-bottom:none}
.todo li.ok a{text-decoration:line-through;color:var(--text-soft)}
.chk{margin-left:auto;background:#EAF6EB;color:#1E7D3A;border-radius:999px;padding:2px 10px;font-size:.78rem;font-weight:700}
table.plan{width:100%;border-collapse:collapse;font-size:.93rem}
table.plan th,table.plan td{border-bottom:1px solid var(--border);padding:8px 6px;text-align:left;vertical-align:top}
table.plan tr.today{background:#F5F8FF}
table.plan tr.past{color:var(--text-soft)}
table.plan .ok a{text-decoration:line-through;color:var(--text-soft)}
.lead{font-size:1.05rem;color:var(--text-soft);margin:0 0 10px}
.guide h3{margin:14px 0 6px;color:var(--primary)}
.guide ol,.guide ul{padding-left:1.4em}
.guide li{margin:4px 0}
.hintrow{margin:8px 0}
.hintbox{margin-top:6px;background:#FFF8E6;border:1px solid #F3D58A;border-radius:var(--radius-sm);padding:8px 12px;font-size:.93rem}
.mastery{display:grid;gap:6px;margin:6px 0}
.mrow{display:flex;align-items:center;gap:8px}
.mbar{flex:1;height:10px;background:var(--bg-soft);border-radius:999px;overflow:hidden}
.mbar i{display:block;height:100%;background:linear-gradient(90deg,var(--secondary),var(--accent))}

/* 静的ランディング（検索エンジン向け・アプリ下部） */
.seo-intro{max-width:760px;margin:24px auto 0;padding:16px 20px;font-size:.92rem;color:var(--text-soft);border-top:1px solid var(--border)}
.seo-intro h2{font-size:1rem;color:var(--text);margin:0 0 8px}
.seo-intro ul{padding-left:1.3em}
.seo-intro li{margin:3px 0}