: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;letter-spacing:.02em;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}
.crumb a:hover{text-decoration:underline}

.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;letter-spacing:.01em}
.page-head .lead{color:var(--cpp-ink-2);font-size:15.5px;margin-top:10px;line-height:1.8}

/* Intro box */
.intro-box{background:var(--cpp-card);border:1px solid var(--cpp-line);border-radius:10px;padding:18px 22px;margin:20px 0;display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media(max-width:680px){.intro-box{grid-template-columns:1fr}}
.intro-box h3{font-size:14px;font-weight:700;color:var(--cpp-ink);margin-bottom:10px;letter-spacing:.02em}
.intro-box ul{font-size:14px;color:var(--cpp-ink-2);line-height:1.9;margin:0;padding-left:22px}
.intro-box code{background:var(--cpp-bg-2);border:1px solid var(--cpp-line);padding:1px 5px;border-radius:4px;font-size:12.5px;color:var(--cpp-ink);font-family:"Consolas","Monaco",monospace}

/* Score bar (sticky under nav) */
.score-bar{position:sticky;top:53px;z-index:40;background:#fff;border:1px solid var(--cpp-line);border-radius:10px;padding:14px 18px;margin:16px 0;box-shadow:0 2px 10px rgba(15,27,45,.04)}
.score-row{display:flex;align-items:center;gap:14px;font-size:14px;color:var(--cpp-ink-2);flex-wrap:wrap}
.score-row b{color:var(--cpp-ink);font-size:18px}
.score-row .cat-chip{padding:3px 10px;border-radius:999px;background:var(--cpp-bg-2);color:var(--cpp-ink-2);font-size:12px;font-weight:700;border:1px solid var(--cpp-line)}
.score-row .cat-chip.done{background:#ecfdf5;color:#047857;border-color:#bbf7d0}
.score-progress{margin-top:10px;height:6px;background:var(--cpp-bg-2);border-radius:3px;overflow:hidden}
.score-fill{height:100%;width:0%;background:linear-gradient(90deg,var(--cpp-accent-2),var(--cpp-accent));transition:width .3s}

/* Category sections */
.cat{background:var(--cpp-card);border:1px solid var(--cpp-line);border-radius:12px;padding:22px 26px;margin:18px 0;scroll-margin-top:150px}
.cat-head{display:flex;align-items:baseline;gap:10px;margin-bottom:4px}
.cat-head h2{font-size:19px;font-weight:700;color:var(--cpp-ink);border-left:3px solid var(--cpp-accent);padding-left:10px}
.cat-head .n{font-size:12.5px;color:var(--cpp-muted);font-weight:600}
.cat .desc{font-size:13.5px;color:var(--cpp-muted);margin-bottom:14px;line-height:1.7}
.cat .desc a{color:var(--cpp-accent);text-decoration:none}
.cat .desc a:hover{text-decoration:underline}

/* Quiz */
.q-card{border:1px solid var(--cpp-line);border-radius:8px;padding:16px 18px;margin:12px 0;background:var(--cpp-bg)}
.q-card h3{font-size:15px;font-weight:700;color:var(--cpp-ink);margin-bottom:12px;line-height:1.65}
.q-card .qnum{display:inline-block;margin-right:8px;padding:2px 9px;background:var(--cpp-accent);color:#fff;border-radius:4px;font-size:12px;font-weight:700}
.q-card .codeblock{background:#0f172a;border-radius:6px;padding:10px 14px;margin:8px 0;font-family:"Consolas","Monaco",monospace;font-size:13px;color:#cbd5e1;line-height:1.7}
.q-card code{background:var(--cpp-bg-2);border:1px solid var(--cpp-line);padding:1px 5px;border-radius:4px;font-size:12.5px;color:var(--cpp-ink);font-family:"Consolas","Monaco",monospace}
.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);transition:.15s}
.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}
.q-ex .ref{display:block;margin-top:6px;font-size:12.5px;color:var(--cpp-muted)}
.q-ex .ref a{color:var(--cpp-accent);text-decoration:none}

/* Summary (appears after all questions answered) */
.summary{display:none;margin:26px 0;padding:24px 28px;background:var(--cpp-card);border-radius:12px;border:1px solid var(--cpp-line);border-top:4px solid var(--cpp-accent)}
.summary.show{display:block}
.summary h2{font-size:22px;font-weight:700;color:var(--cpp-ink);margin-bottom:6px}
.summary .final{font-size:36px;font-weight:800;color:var(--cpp-accent);letter-spacing:.02em;margin:10px 0}
.summary .rank{display:inline-block;padding:4px 14px;border-radius:6px;font-size:14px;font-weight:700;margin-left:8px}
.summary .rank.a{background:#ecfdf5;color:#047857;border:1px solid #bbf7d0}
.summary .rank.b{background:#f0f9ff;color:#0369a1;border:1px solid #bae6fd}
.summary .rank.c{background:#fffbeb;color:#b45309;border:1px solid #fde68a}
.summary .rank.d{background:#fef2f2;color:#b91c1c;border:1px solid #fecaca}
.summary .advice{margin-top:14px;font-size:14.5px;color:var(--cpp-ink-2);line-height:1.9}
.summary .cta{margin-top:18px;display:flex;gap:10px;flex-wrap:wrap}
.summary .cta a{display:inline-block;padding:10px 18px;border-radius:6px;text-decoration:none;font-size:14px;font-weight:700}
.summary .cta .primary{background:var(--cpp-accent);color:#fff}
.summary .cta .ghost{background:#fff;color:var(--cpp-accent);border:1px solid var(--cpp-line)}

.pager{margin:22px 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;transition:.15s}
.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;align-items:center;flex-wrap:wrap}
.page-footer nav{display:flex;gap:16px;flex-wrap:wrap}
.page-footer a{color:var(--cpp-ink-2);text-decoration:none}
.page-footer a:hover{color:var(--cpp-accent)}