: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 14px 34px rgba(40,32,18,.09);
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;min-height:100%;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Hiragino Sans","Yu Gothic",Meiryo,sans-serif;font-weight:750}
body{padding-bottom:env(safe-area-inset-bottom)}
button,input,textarea,select{font:inherit}
.topbar{height:76px;padding:10px 16px 8px calc(16px + env(safe-area-inset-left));padding-right:calc(16px + env(safe-area-inset-right));display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);background:rgba(255,250,240,.86);backdrop-filter:blur(12px);position:sticky;top:0;z-index:20}
.brand{font-size:10px;letter-spacing:.20em;color:#b1842b;font-weight:950;white-space:nowrap}.topbar h1{font-size:20px;line-height:1.1;margin:4px 0 0}.home-btn,.small-btn,.pill{border:1px solid var(--line);background:#fffaf2;border-radius:14px;color:var(--ink);font-weight:950;padding:10px 13px;box-shadow:0 4px 12px rgba(0,0,0,.04)}
.home-btn{font-size:16px;min-width:78px}.wrap{padding:14px 14px 28px}.hero{display:flex;gap:14px;align-items:center;background:var(--panel);border:1px solid var(--line);border-radius:24px;padding:18px;box-shadow:var(--shadow);margin-bottom:14px}.mark{width:58px;height:58px;border-radius:17px;background:var(--navy);color:white;display:grid;place-items:center;font-size:30px;font-weight:950;flex:0 0 auto}.label{font-size:10px;letter-spacing:.18em;color:#b1842b;font-weight:950}.hero h2{font-size:26px;line-height:1.15;margin:4px 0}.hero p{color:var(--muted);font-size:14px;line-height:1.55;margin:0}.grid{display:grid;grid-template-columns:1fr;gap:12px}.card{background:var(--panel);border:1px solid var(--line);border-radius:20px;padding:18px;box-shadow:var(--shadow)}.card h3{margin:0 0 8px;font-size:21px}.card p{margin:0;color:var(--muted);font-size:14px}.stats{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin-top:14px}.stat{background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:14px;box-shadow:0 8px 18px rgba(0,0,0,.03)}.stat b{font-size:28px}.toolbar{display:flex;gap:8px;align-items:center;overflow:auto;padding:2px 0 10px;margin-bottom:2px}.toolbar::-webkit-scrollbar{display:none}.search{width:100%;border:1px solid var(--line);border-radius:14px;padding:13px 14px;background:white;color:var(--ink);font-weight:750;margin:8px 0 12px}.study{padding:12px 12px 130px}.study-top{display:flex;gap:8px;align-items:center;overflow:auto;margin-bottom:10px}.study-top::-webkit-scrollbar{display:none}.qbox{background:var(--panel);border:1px solid var(--line);border-radius:24px;padding:18px;box-shadow:var(--shadow);margin-bottom:12px}.qhead{display:flex;gap:8px;align-items:center;margin-bottom:12px}.qno{font-size:22px;font-weight:950}.section{font-size:12px;color:var(--muted);line-height:1.35}.badge{margin-left:auto;border-radius:999px;padding:7px 10px;background:white;border:1px solid var(--line);font-size:12px;white-space:nowrap}.badge.easy{background:#e8f7ef;color:#096a4a}.badge.sus{background:#fff1c7;color:#865b00}.badge.bad{background:#ffe4e7;color:#a10d2c}.question{font-size:18px;line-height:1.85;white-space:pre-wrap}.answer-fixed{position:fixed;left:0;right:0;bottom:0;z-index:15;background:rgba(244,239,228,.92);backdrop-filter:blur(14px);border-top:1px solid var(--line);padding:10px 12px calc(10px + env(safe-area-inset-bottom));box-shadow:0 -10px 30px rgba(40,32,18,.08)}.answer-row{display:grid;grid-template-columns:1fr 1fr;gap:10px}.big{border:0;border-radius:16px;color:white;padding:18px 10px;font-size:20px;font-weight:950}.ok{background:var(--green)}.ng{background:var(--red)}.rank-row{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:8px}.rank{border:0;border-radius:14px;color:white;padding:12px 6px;font-size:15px;font-weight:950}.rank.easy{background:#159b70}.rank.sus{background:#dfa000}.rank.bad{background:#d51d3f}.result{background:var(--panel);border:1px solid var(--line);border-radius:22px;padding:16px;box-shadow:var(--shadow);margin-bottom:12px}.result h3{font-size:19px;margin:0 0 10px}.result .exp{font-size:16px;line-height:1.78;white-space:pre-wrap}.good{color:var(--green)}.wrong{color:var(--red)}.copy-btn{width:100%;background:var(--navy);color:white;border:0;border-radius:14px;padding:14px;font-weight:950;margin:12px 0 0}.nav-row{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:12px}.nav-row button{padding:13px}.memoBox{background:var(--panel);border:1px solid var(--line);border-radius:22px;padding:16px;box-shadow:var(--shadow);margin-bottom:12px}.tabs{display:flex;gap:8px;margin-bottom:10px}.tab{border:0;border-radius:12px;background:white;padding:10px 12px;font-weight:950}.tab.active{background:var(--navy);color:white}textarea{width:100%;min-height:130px;resize:vertical;border:1px solid var(--line);border-radius:16px;padding:13px;font-size:16px;line-height:1.65;background:white;color:var(--ink)}.hidden{display:none}.memo-actions{display:grid;grid-template-columns:1fr;gap:8px;margin-top:9px}.chapters{display:grid;grid-template-columns:1fr;gap:10px}.chapter{padding:16px;border:1px solid var(--line);border-radius:18px;background:var(--panel);box-shadow:0 8px 18px rgba(0,0,0,.03)}.syncbox{background:var(--panel);border:1px solid var(--line);border-radius:24px;padding:18px;box-shadow:var(--shadow);display:grid;gap:13px}.sync-input{width:100%;border:1px solid var(--line);border-radius:14px;padding:14px;background:white;font-size:15px;font-weight:750;color:var(--ink)}.checkline{display:flex;gap:10px;align-items:center;font-weight:950}.sync-actions{display:grid;grid-template-columns:1fr;gap:10px}.sync-status{padding:12px 14px;border:1px dashed var(--line);border-radius:14px;background:#fffdf7;line-height:1.5}.sync-note{color:var(--muted);font-size:13px;line-height:1.6;margin:0}.full-btn{width:100%;padding:15px}.muted{color:var(--muted)}
@media(min-width:700px){.wrap,.study{max-width:760px;margin:0 auto}.grid{grid-template-columns:repeat(2,1fr)}.sync-actions,.memo-actions{grid-template-columns:1fr 1fr}.answer-fixed{left:50%;transform:translateX(-50%);max-width:760px;border-left:1px solid var(--line);border-right:1px solid var(--line);border-radius:22px 22px 0 0}}