: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:920px;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}
.learn-box{background:#fff;border:1px solid var(--cpp-line);border-left:4px solid var(--cpp-accent);border-radius:10px;padding:16px 20px;margin:18px 0;display:grid;grid-template-columns:1fr 1fr;gap:22px}
@media(max-width:680px){.learn-box{grid-template-columns:1fr}}
.learn-box .col h3{font-size:13px;color:var(--cpp-accent);font-weight:700;margin-bottom:8px;letter-spacing:.04em}
.learn-box ul{margin:0;padding-left:20px;font-size:14px;color:var(--cpp-ink-2);line-height:1.95}
.toc{background:var(--cpp-card);border:1px solid var(--cpp-line);border-radius:10px;padding:18px 22px;margin:18px 0}
.toc h2{font-size:14px;color:var(--cpp-muted);font-weight:700;margin-bottom:10px;letter-spacing:.04em}
.toc ol{padding-left:22px;font-size:14.5px;line-height:1.95}
.toc ol a{color:var(--cpp-ink-2);text-decoration:none}
.toc ol a:hover{color:var(--cpp-accent)}
section.block{background:var(--cpp-card);border:1px solid var(--cpp-line);border-radius:12px;padding:28px 30px;margin:20px 0}
section.block h2{font-size:22px;font-weight:700;color:var(--cpp-ink);margin-bottom:14px;border-left:3px solid var(--cpp-accent);padding-left:12px}
section.block h3{font-size:16.5px;font-weight:700;color:var(--cpp-ink);margin:20px 0 10px}
section.block p{font-size:15px;color:var(--cpp-ink-2);line-height:1.9;margin:10px 0}
section.block b{color:var(--cpp-ink)}
section.block code{background:#eef4fa;border:1px solid var(--cpp-line);padding:1px 6px;border-radius:4px;font-size:13.5px;color:var(--cpp-ink);font-family:"Consolas","Monaco",monospace}
section.block ul{font-size:15px;color:var(--cpp-ink-2);line-height:1.95;padding-left:22px;margin:10px 0}
.note{background:var(--cpp-bg-2);border-left:3px solid var(--cpp-accent-2);padding:12px 16px;border-radius:0 8px 8px 0;margin:14px 0;font-size:14px;color:var(--cpp-ink-2);line-height:1.8}
.ba{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:16px 0}
@media(max-width:680px){.ba{grid-template-columns:1fr}}
.ba-card{background:#0f172a;border-radius:10px;border:1px solid #1e293b;overflow:hidden}
.ba-bar{background:#1e293b;padding:8px 14px;display:flex;justify-content:space-between;font-family:monospace}
.ba-bar .fn{font-size:12px;color:#94a3b8}
.ba-bar .tag{font-size:10.5px;font-weight:700;padding:2px 10px;border-radius:4px;background:var(--cpp-accent);color:#fff}
.ba-bar .tag.c{background:#64748b}.ba-bar .tag.ng{background:#dc2626}
.ba-code{padding:14px 16px;font-family:monospace;font-size:13px;line-height:1.75;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}
.algo-tbl{width:100%;border-collapse:collapse;font-size:13px;margin:12px 0}
.algo-tbl th,.algo-tbl td{border:1px solid var(--cpp-line);padding:8px 10px;text-align:left}
.algo-tbl th{background:var(--cpp-bg-2);font-weight:700}
.algo-tbl code{background:#f1f5f9;padding:1px 5px;border-radius:3px;font-size:12px}
.demo{background:var(--cpp-bg-2);border:1px dashed var(--cpp-accent-2);border-radius:10px;padding:18px 20px;margin:16px 0}
.demo-title{font-size:13px;color:var(--cpp-accent);font-weight:700;margin-bottom:10px;letter-spacing:.04em}
.btn{background:var(--cpp-accent);color:#fff;border:none;border-radius:6px;padding:8px 16px;font-size:13px;font-weight:700;cursor:pointer;margin:2px 4px 2px 0;font-family:inherit}
.btn:hover{background:#025a87}
.btn.alt{background:#fff;color:var(--cpp-accent);border:1px solid var(--cpp-accent)}
.btn.reset{background:#64748b}
.lanes{display:grid;grid-template-columns:auto 1fr;gap:4px;margin:12px 0;background:#fff;border:1px solid var(--cpp-line);border-radius:8px;padding:12px}
.lane-lbl{padding:4px 10px;font-family:monospace;font-size:12.5px;color:var(--cpp-ink-2);display:flex;align-items:center}
.lane-track{position:relative;height:28px;background:#f1f5f9;border-radius:4px;overflow:hidden}
.lane-seg{position:absolute;top:3px;height:22px;border-radius:3px;font-size:11px;color:#fff;line-height:22px;padding:0 8px;font-family:monospace;white-space:nowrap}
.lane-seg.t1{background:#0369a1}
.lane-seg.t2{background:#059669}
.lane-seg.t3{background:#b45309}
.lane-seg.main{background:#7c3aed}
.lane-seg.join{background:#94a3b8;opacity:.6}
.log{background:#0f172a;color:#86efac;font-family:monospace;font-size:12.5px;padding:12px 14px;border-radius:8px;min-height:80px;max-height:200px;overflow-y:auto;line-height:1.75;margin-top:10px}
.log .ok{color:#86efac}.log .err{color:#f87171}.log .dim{color:#64748b}.log .info{color:#60a5fa}.log .thr1{color:#60a5fa}.log .thr2{color:#34d399}.log .thr3{color:#fbbf24}
.q-card{border:1px solid var(--cpp-line);border-radius:8px;padding:18px 20px;margin:14px 0;background:var(--cpp-bg)}
.q-card h3{font-size:15.5px;font-weight:700;color:var(--cpp-ink);margin-bottom:12px}
.q-opt{display:block;padding:10px 14px;margin:6px 0;border:1px solid var(--cpp-line);border-radius:6px;background:#fff;cursor:pointer;font-size:14.5px;color:var(--cpp-ink-2)}
.q-opt:hover{border-color:var(--cpp-accent-2);background:#eaf4fb}
.q-opt.ok{border-color:#22a56a;background:#e9f7ef;color:#185a38;font-weight:700}
.q-opt.ng{border-color:#dc2626;background:#fbeaea;color:#8a1a1a}
.q-opt.disabled{pointer-events:none}
.q-ex{display:none;margin-top:10px;padding:12px 14px;background:var(--cpp-bg-2);border:1px solid var(--cpp-line);border-radius:6px;font-size:14px;line-height:1.8}
.q-ex.show{display:block}
.quiz-block{background:var(--cpp-card);border:1px solid var(--cpp-line);border-radius:12px;padding:24px 28px;margin:28px 0}
.quiz-block h2{font-size:20px;font-weight:700;color:var(--cpp-ink);margin-bottom:8px}
.related{margin:32px 0 10px}
.related h2{font-size:18px;font-weight:700;color:var(--cpp-ink);margin-bottom:12px;border-left:3px solid var(--cpp-accent);padding-left:12px}
.rel-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:10px}
.rel-card{display:block;background:var(--cpp-card);border:1px solid var(--cpp-line);border-radius:8px;padding:14px 16px;text-decoration:none;color:inherit}
.rel-card:hover{border-color:var(--cpp-accent);background:var(--cpp-bg-2)}
.rel-card .k{font-size:11px;color:var(--cpp-muted);font-weight:700}
.rel-card .t{font-size:14.5px;font-weight:700;color:var(--cpp-ink);margin-top:3px}
.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}