:root{--cpp-ink:#0f1b2d;--cpp-ink-2:#334155;--cpp-muted:#64748b;--cpp-line:#dfe7ef;--cpp-bg:#f7fafd;--cpp-bg-2:#eef4fa;--cpp-card:#ffffff;--cpp-accent:#0369a1;--cpp-accent-2:#0ea5e9}
body{font-family:"Hiragino Sans","Noto Sans JP","Yu Gothic",system-ui,-apple-system,sans-serif!important;background:#f7fafd!important;color:var(--cpp-ink)!important;line-height:1.72!important}
.top-nav{position:sticky;top:0;z-index:50;background:rgba(247,250,253,.92);backdrop-filter:saturate(150%) blur(8px);border-bottom:1px solid var(--cpp-line)}
.top-nav-inner{max-width:1120px;margin:0 auto;padding:12px 20px;display:flex;gap:20px;align-items:center;flex-wrap:wrap;font-size:14px}
.top-nav .brand{font-weight:800;color:var(--cpp-ink);text-decoration:none;font-size:15px}
.top-nav .brand em{font-style:normal;color:var(--cpp-accent)}
.top-nav-links{display:flex;gap:16px;margin-left:auto;flex-wrap:wrap;align-items:center}
.top-nav-links a{color:var(--cpp-ink-2);text-decoration:none;font-weight:600}
.top-nav-links .div{color:#cbd5e1}
.page-wrap{max-width:960px;margin:0 auto;padding:0 20px}
.crumb{padding:16px 0 8px;font-size:13px;color:var(--cpp-muted)}
.crumb a{color:var(--cpp-accent);text-decoration:none}
.page-head{padding:24px 0 12px}
.page-head h1{font-size:clamp(26px,3.5vw,34px);font-weight:800;color:var(--cpp-ink);line-height:1.4}
.page-head .lead{color:var(--cpp-ink-2);font-size:15.5px;margin-top:10px;line-height:1.8}
.progress{background:var(--cpp-bg-2);border-radius:6px;height:10px;margin:14px 0;overflow:hidden}
.progress .bar{height:100%;background:var(--cpp-accent);width:0;transition:width .3s}
.progress-lbl{font-size:12.5px;color:var(--cpp-muted);margin-bottom:4px}
.cat-tabs{display:flex;gap:6px;flex-wrap:wrap;margin:14px 0}
.cat-tab{padding:8px 14px;border:1px solid var(--cpp-line);border-radius:6px;cursor:pointer;background:#fff;font-weight:700;font-size:13px;color:var(--cpp-ink-2)}
.cat-tab.on{background:var(--cpp-accent);border-color:var(--cpp-accent);color:#fff}
.qex{background:#fff;border:1px solid var(--cpp-line);border-radius:10px;padding:18px 20px;margin:14px 0}
.qex h3{font-size:15.5px;font-weight:700;color:var(--cpp-ink);margin-bottom:8px;display:flex;gap:8px;align-items:center}
.qex h3 .num{background:var(--cpp-accent);color:#fff;font-size:12px;padding:2px 8px;border-radius:12px;min-width:40px;text-align:center}
.qex h3 .diff{font-size:11px;padding:2px 8px;border-radius:3px;font-weight:700}
.qex h3 .diff.e{background:#dcfce7;color:#14532d}
.qex h3 .diff.m{background:#fef3c7;color:#854d0e}
.qex h3 .diff.h{background:#fee2e2;color:#991b1b}
.qex p{font-size:14px;color:var(--cpp-ink-2);line-height:1.85;margin:6px 0}
.qex .spec{background:var(--cpp-bg);border:1px solid var(--cpp-line);border-radius:6px;padding:10px 14px;margin:8px 0;font-size:13.5px;color:var(--cpp-ink-2);font-family:"Consolas","Monaco",monospace;line-height:1.7;white-space:pre-wrap}
.toggle-btn{background:var(--cpp-accent);color:#fff;border:none;border-radius:6px;padding:7px 14px;font-size:12.5px;font-weight:700;cursor:pointer;margin-top:6px;font-family:inherit}
.toggle-btn.done{background:#22a56a}
.ans{display:none;margin-top:10px}
.ans.show{display:block}
.ba-card{background:#0f172a;border-radius:8px;overflow:hidden;margin:6px 0}
.ba-bar{background:#1e293b;padding:6px 12px;font-family:monospace;font-size:11px;display:flex;justify-content:space-between}
.ba-bar .fn{color:#94a3b8}
.ba-bar .tag{padding:2px 8px;border-radius:3px;background:#22a56a;color:#fff;font-weight:700}
.ba-code{padding:10px 14px;font-family:monospace;font-size:12.5px;line-height:1.7;color:#cbd5e1;white-space:pre;overflow-x:auto}
.ba-code .k{color:#c084fc}.ba-code .f{color:#60a5fa}.ba-code .s{color:#86efac}.ba-code .c{color:#64748b;font-style:italic}.ba-code .n{color:#fbbf24}.ba-code .t{color:#22d3ee}
.pager{margin:20px 0;display:flex;gap:12px;flex-wrap:wrap}
.pager a{flex:1;min-width:220px;display:block;background:var(--cpp-card);border:1px solid var(--cpp-line);border-radius:8px;padding:16px 18px;text-decoration:none;color:inherit}
.pager a.next{text-align:right;background:var(--cpp-bg-2)}
.pager a .k{font-size:11px;color:var(--cpp-muted)}
.pager a .t{font-size:14.5px;font-weight:700;color:var(--cpp-ink);margin-top:4px}
.page-footer{max-width:1120px;margin:30px auto 0;padding:20px;color:var(--cpp-muted);font-size:13px;border-top:1px solid var(--cpp-line);display:flex;gap:16px;justify-content:space-between;flex-wrap:wrap}
.page-footer a{color:var(--cpp-ink-2);text-decoration:none}