: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 a:hover{color:var(--cpp-accent)}
.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:var(--cpp-card);border:1px solid var(--cpp-line);border-radius:10px;padding:20px 22px;margin:20px 0}
.learn-box .ttl{font-size:14px;font-weight:700;color:var(--cpp-ink);margin-bottom:14px}
.learn-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
@media(max-width:720px){.learn-grid{grid-template-columns:1fr}}
.learn-col{background:#fff;border:1px solid var(--cpp-line);border-radius:8px;padding:14px 16px}
.learn-col .hd{font-size:12.5px;font-weight:700;margin-bottom:8px}
.learn-col.min{background:#ecfdf5;border-color:#bbf7d0}.learn-col.min .hd{color:#047857}
.learn-col.opt{background:#fffbeb;border-color:#fde68a}.learn-col.opt .hd{color:#b45309}
.learn-col ul{font-size:14px;color:var(--cpp-ink-2);line-height:1.85;margin:0;padding-left:20px}
.learn-col code{background:#fff;border:1px solid var(--cpp-line);padding:1px 6px;border-radius:4px;font-size:13px;color:var(--cpp-ink);font-family:"Consolas","Monaco",monospace}
.toc{background:var(--cpp-card);border:1px solid var(--cpp-line);border-radius:10px;padding:16px 20px;margin:20px 0}
.toc .hd{font-size:12px;font-weight:700;color:var(--cpp-muted);margin-bottom:10px;text-transform:uppercase}
.toc ol{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:4px}
.toc li a{display:flex;gap:12px;padding:8px 12px;border-radius:6px;text-decoration:none;color:var(--cpp-ink-2);font-size:14.5px;border:1px solid transparent}
.toc li a:hover{background:var(--cpp-bg-2);border-color:var(--cpp-line);color:var(--cpp-ink)}
.toc li a .n{min-width:22px;color:var(--cpp-accent);font-weight:700}
section.block{background:var(--cpp-card);border:1px solid var(--cpp-line);border-radius:12px;padding:28px 30px;margin:20px 0;scroll-margin-top:80px}
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}
.note b{color:var(--cpp-ink)}
.warn{background:#fff7ed;border-left:3px solid #f97316;padding:12px 16px;border-radius:0 8px 8px 0;margin:14px 0;font-size:14px;color:#7c2d12;line-height:1.8}

/* Main lifecycle sim */
.sim{background:#fff;border:1px solid var(--cpp-line);border-radius:10px;padding:16px;margin:12px 0}
.sim-controls{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-bottom:14px}
.sim-controls select,.sim-controls button{padding:7px 12px;border:1px solid var(--cpp-line);border-radius:6px;font-family:inherit;font-size:13px;background:#fff}
.sim-controls button{background:var(--cpp-accent);color:#fff;border:none;font-weight:700;cursor:pointer}
.sim-controls button:hover{background:#075985}
.sim-controls button.sec{background:#64748b}
.sim-controls button.danger{background:#dc2626}
.sim-body{display:grid;grid-template-columns:1fr 1fr;gap:14px}
@media(max-width:820px){.sim-body{grid-template-columns:1fr}}
.sim-code{background:#0f172a;color:#cbd5e1;border-radius:6px;padding:12px 14px;font-family:"Consolas","Monaco",monospace;font-size:13px;line-height:1.8;max-height:420px;overflow-y:auto}
.sim-code .line{padding:3px 6px;border-radius:3px;white-space:pre}
.sim-code .line.active{background:#fbbf24;color:#78350f;font-weight:700}
.sim-code .line.done{opacity:.55}
.sim-state{display:flex;flex-direction:column;gap:12px}
.sim-objs{background:var(--cpp-bg);border:1px solid var(--cpp-line);border-radius:6px;padding:10px 12px}
.sim-objs .title{font-size:11px;font-weight:700;color:var(--cpp-muted);text-transform:uppercase;letter-spacing:.05em;margin-bottom:8px}
.sim-obj{padding:8px 10px;border:2px solid #3b82f6;background:#dbeafe;color:#1e3a8a;border-radius:4px;margin:4px 0;font-family:monospace;font-size:13px;transition:all .3s}
.sim-obj.just{background:#dcfce7;border-color:#10b981;color:#065f46}
.sim-obj.empty{background:#f1f5f9;color:#94a3b8;border-style:dashed}
.sim-heap{background:#fef3c7;border:2px dashed #f59e0b;border-radius:6px;padding:10px 12px;font-family:monospace;font-size:12.5px;color:#92400e;margin:4px 0}
.sim-heap.highlight{background:#fde68a;box-shadow:0 0 0 3px rgba(245,158,11,.3)}
.sim-log{background:#0b1220;color:#cbd5e1;border-radius:6px;padding:10px 12px;font-family:"Consolas","Monaco",monospace;font-size:12px;max-height:240px;overflow-y:auto;line-height:1.75}
.sim-log .ev{padding:2px 6px;border-radius:3px;margin:2px 0}
.sim-log .ctor{color:#86efac}
.sim-log .dtor{color:#fca5a5}
.sim-log .copy{color:#fbbf24}
.sim-log .move{color:#c4b5fd}
.sim-log .rvo{color:#67e8f9;font-style:italic}

/* Scenario tabs */
.sc-tabs{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:10px}
.sc-tab{padding:6px 12px;background:#f1f5f9;border:1px solid var(--cpp-line);border-radius:4px;font-size:12px;cursor:pointer;font-weight:700;color:var(--cpp-ink-2)}
.sc-tab.active{background:var(--cpp-accent);color:#fff;border-color:var(--cpp-accent)}

/* Counters */
.counters{display:grid;grid-template-columns:repeat(auto-fill,minmax(110px,1fr));gap:8px;margin-top:10px}
.counter{background:#fff;border:1px solid var(--cpp-line);border-radius:6px;padding:8px 10px;text-align:center}
.counter .n{font-size:11px;color:var(--cpp-muted);text-transform:uppercase;letter-spacing:.04em;font-weight:700}
.counter .v{font-size:18px;font-weight:800;color:var(--cpp-ink);font-family:monospace;margin-top:2px}
.counter.ctor .v{color:#059669}
.counter.dtor .v{color:#dc2626}
.counter.copy .v{color:#b45309}
.counter.move .v{color:#7c3aed}

.opt-divider{display:flex;align-items:center;gap:14px;margin:32px 0 18px;padding:16px 20px;background:linear-gradient(90deg,#fffbeb,#fef3c7);border:1px solid #fde68a;border-left:4px solid #f59e0b;border-radius:8px}
.opt-divider .icon{font-size:22px}
.opt-divider .txt{flex:1}
.opt-divider .ttl{font-size:15px;font-weight:700;color:#92400e}
.opt-divider .sub{font-size:13px;color:#b45309;margin-top:3px;line-height:1.65}
.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}
.quiz-block .sub{font-size:14px;color:var(--cpp-muted);margin-bottom:18px}
.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;color:var(--cpp-ink-2);line-height:1.8}
.q-ex.show{display:block}
.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}
.rel-card .d{font-size:13px;color:var(--cpp-ink-2);margin-top:4px;line-height:1.6}
.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:hover{border-color:var(--cpp-accent);background:var(--cpp-bg-2)}
.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 nav{display:flex;gap:16px;flex-wrap:wrap}
.page-footer a{color:var(--cpp-ink-2);text-decoration:none}