:root{--bg:#f4efe4;--panel:#fffaf0;--ink:#0e1a36;--muted:#697083;--line:#ded2bd;--navy:#13264a;--green:#16805f;--red:#b51f3d;--gold:#d99a00;--soft-green:#eef7ee;--soft-red:#fff4f3;--soft-gold:#fff8e6;--shadow:0 18px 45px rgba(40,32,18,.08)}
*{box-sizing:border-box} body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Hiragino Sans","Yu Gothic",Meiryo,sans-serif;font-weight:650} .topbar{height:72px;display:flex;align-items:center;justify-content:space-between;padding:0 20px;border-bottom:1px solid var(--line);background:rgba(255,250,240,.78);backdrop-filter:blur(10px);position:sticky;top:0;z-index:5}.brand{font-size:12px;letter-spacing:.18em;color:#b1842b;font-weight:900}.topbar h1{font-size:22px;margin:2px 0 0}.home-btn,.pill,.small-btn{border:1px solid var(--line);background:#fffaf2;border-radius:14px;color:var(--ink);font-weight:900;padding:10px 15px;box-shadow:0 4px 12px rgba(0,0,0,.04);cursor:pointer}.home-btn{font-size:17px}.home{max-width:1120px;margin:32px auto}.hero{display:flex;gap:26px;align-items:center;background:#fffaf0;border:1px solid var(--line);border-radius:28px;padding:34px;box-shadow:var(--shadow)}.mark{width:78px;height:78px;border-radius:22px;background:var(--navy);color:white;display:grid;place-items:center;font-size:38px;font-weight:900}.hero h2{font-size:34px;margin:8px 0}.hero p{color:var(--muted);margin:0}.grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:20px}.card{background:#fffaf0;border:1px solid var(--line);border-radius:20px;padding:24px;min-height:116px;box-shadow:var(--shadow);cursor:pointer}.card:hover{transform:translateY(-1px)}.card h3{margin:0 0 12px;font-size:21px}.card p{margin:0;color:var(--muted)}.study{display:grid;grid-template-columns:58.5% 41.5%;height:calc(100vh - 72px)}.left,.right{padding:18px}.left{border-right:1px solid var(--line);overflow:auto}.right{overflow:auto}.toolbar{display:flex;align-items:center;gap:12px;margin-bottom:18px}.toolbar .spacer{flex:1}.qcard{background:rgba(255,250,240,.95);border:1px solid var(--line);border-radius:18px;margin:0 0 14px;padding:20px 18px;cursor:pointer;box-shadow:0 8px 20px rgba(0,0,0,.035)}.qcard.selected{background:var(--soft-green);outline:3px solid rgba(22,128,95,.20);border-color:#a8cdbf}.qhead{display:flex;align-items:center;gap:10px;margin-bottom:12px}.qno{font-size:18px;font-weight:950}.section{font-size:12px;color:var(--muted)}.badge{margin-left:auto;border-radius:999px;padding:6px 10px;background:white;border:1px solid var(--line);font-size:12px}.badge.easy{background:#e8f7ef;color:#096a4a}.badge.sus{background:#fff1c7;color:#865b00}.badge.bad{background:#ffe4e7;color:#a10d2c}.question{font-size:17px;line-height:1.85;white-space:pre-wrap}.command{background:#fffaf0;border:1px solid var(--line);border-radius:22px;padding:18px;box-shadow:var(--shadow)}.cmdtop{display:flex;justify-content:space-between;align-items:start}.label{font-size:11px;letter-spacing:.18em;color:#b1842b}.cmdno{font-size:28px;font-weight:950}.answer-row{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:14px 0}.big{border:0;border-radius:14px;color:white;padding:20px;font-size:24px;font-weight:950;cursor:pointer}.ok{background:var(--green)}.ng{background:var(--red)}.feedback{min-height:48px;border:1px dashed var(--line);border-radius:16px;padding:14px;color:var(--muted);background:rgba(255,255,255,.45)}.rank-row{display:grid;grid-template-columns:repeat(3,1fr);gap:9px;margin:12px 0}.rank{border:0;border-radius:12px;color:white;padding:14px;font-size:18px;font-weight:950;cursor:pointer}.rank.easy{background:#159b70}.rank.sus{background:#dfa000}.rank.bad{background:#d51d3f}.explain{border-top:1px solid var(--line);margin-top:12px;padding-top:12px}.explain summary{cursor:pointer;font-size:17px;font-weight:950}.exp-body{line-height:1.8;font-size:15px;margin-top:10px}.selects{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:10px}.selects select{width:100%;border:1px solid var(--line);border-radius:10px;padding:8px;background:white}.memoBox{background:#fffaf0;border:1px solid var(--line);border-radius:22px;margin-top:14px;padding:18px;box-shadow:var(--shadow)}.tabs{display:flex;gap:10px;margin-bottom:10px}.tab{border:0;border-radius:10px;background:#fff;padding:10px 14px;font-weight:950;cursor:pointer}.tab.active{background:var(--navy);color:white}textarea{width:100%;min-height:160px;resize:vertical;border:1px solid var(--line);border-radius:16px;padding:14px;font-size:16px;line-height:1.7;background:white}.memo-actions{display:flex;gap:10px;margin-top:10px}.hidden{display:none}.stats{display:grid;grid-template-columns:repeat(5,1fr);gap:10px;margin-top:16px}.stat{background:#fffaf0;border:1px solid var(--line);border-radius:16px;padding:16px}.stat b{font-size:28px} .chapters{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.chapter{padding:18px;border:1px solid var(--line);border-radius:16px;background:#fffaf0;cursor:pointer}.search{flex:0 0 260px;border:1px solid var(--line);border-radius:12px;padding:10px 12px;background:white;font-weight:700}@media(max-width:1100px){.study{grid-template-columns:1fr}.right{border-top:1px solid var(--line)}.grid{grid-template-columns:repeat(2,1fr)}}

.explain.locked{padding:14px 16px; border:1px dashed #d8cbb8; border-radius:14px; color:#6f6a60; background:#fffdf7; margin-top:12px;}
.explain.locked p{margin:6px 0 0;}
.copyline{display:flex;align-items:center;gap:10px;margin:10px 0 8px 0;}
.copy-btn{background:#14224a;color:white;border-color:#14224a;}
.copyhint{font-size:12px;color:#6b7280;}

.syncbox{margin-top:18px;background:#fffaf0;border:1px solid var(--line);border-radius:22px;padding:24px;box-shadow:var(--shadow);display:grid;gap:14px;max-width:850px}.sync-input{width:100%;border:1px solid var(--line);border-radius:12px;padding:12px 14px;background:white;font-size:16px;font-weight:700;color:var(--ink)}.checkline{display:flex;gap:10px;align-items:center;font-weight:900}.sync-actions{display:flex;gap:10px;flex-wrap:wrap}.sync-status{padding:12px 14px;border:1px dashed var(--line);border-radius:14px;background:#fffdf7}.sync-note{color:var(--muted);font-size:14px;margin:0}