/* ---------- Top bar ---------- */
  header.topbar {
    position: sticky; top: 0; z-index: 50;
    backdrop-filter: blur(16px) saturate(1.2);
    background: linear-gradient(180deg, rgba(8,8,11,0.94), rgba(8,8,11,0.76));
    border-bottom: 1px solid var(--border);
  }
  /* Thin vermillion gradient rule under the header */
  header.topbar::after {
    content: ''; position: absolute; left: 0; right: 0; bottom: -1px; height: 1px;
    background: linear-gradient(90deg, transparent, rgba(224,78,57,0.45), rgba(60,105,151,0.3), transparent);
  }
  .topbar-inner {
    max-width: 1320px; margin: 0 auto;
    padding: 16px 24px;
    display: flex; align-items: center; gap: 18px;
  }
  .logo {
    display: flex; align-items: center; gap: 12px;
    font-weight: 700; letter-spacing: -0.01em; font-size: 17px;
  }
  /* 判子 hanko seal, tilts in 3D as you move across the header */
  .logo-mark {
    width: 38px; height: 38px; border-radius: 10px;
    background: linear-gradient(150deg, var(--accent-soft), var(--accent) 45%, var(--accent-2));
    display: grid; place-items: center;
    position: relative;
    transform-style: preserve-3d;
    transition: transform .5s var(--ease), box-shadow .4s var(--ease);
    box-shadow:
      0 8px 22px -6px var(--accent-glow),
      0 2px 0 0 rgba(255,255,255,0.10) inset,
      0 -2px 0 0 rgba(0,0,0,0.22) inset;
  }
  .logo-mark::after {
    content: '設'; position: absolute; inset: 0;
    display: grid; place-items: center;
    font-family: "Yu Gothic UI", "Yu Gothic", "Hiragino Sans", "Noto Sans JP", serif;
    font-size: 19px; font-weight: 700; color: #fff;
    text-shadow: 0 1px 2px rgba(0,0,0,0.35);
    transform: translateZ(6px);
  }
  .logo:hover .logo-mark {
    transform: perspective(420px) rotateY(-16deg) rotateX(9deg) scale(1.04);
    box-shadow: 0 14px 30px -8px var(--accent-glow), 0 2px 0 0 rgba(255,255,255,0.14) inset;
  }
  .logo small {
    display: block; color: var(--text-mute); font-weight: 400; font-size: 10.5px;
    letter-spacing: 0.18em; margin-top: 1px;
  }
  .logo .title-main { font-size: 16px; letter-spacing: -0.01em; }
  .logo .title-main b { font-weight: 700; }
  .logo .accent-bar {
    display: inline-block; width: 3px; height: 11px; border-radius: 2px;
    background: var(--accent); margin-right: 7px; vertical-align: -1px;
  }
  .search {
    flex: 1 1 140px; min-width: 0; max-width: 520px;
    position: relative;
  }
  .search input {
    width: 100%;
    height: 40px; padding: 0 14px 0 40px;
    background: var(--panel);
    border: 1px solid var(--border);
    color: var(--text);
    border-radius: 10px;
    font-size: 14px;
    transition: border-color .15s, box-shadow .15s;
  }
  .search input::placeholder { color: var(--text-mute); }
  .search input:focus {
    outline: none; border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
    background: var(--panel-2);
  }
  .search input:focus + svg { color: var(--accent); }
  .quick button {
    transition: border-color .18s var(--ease), color .18s var(--ease), transform .18s var(--ease), background .18s;
  }
  .quick button:hover {
    border-color: var(--accent); color: var(--accent-soft);
    background: rgba(224,78,57,0.07); transform: translateY(-1px);
  }
  .quick h5 { letter-spacing: 0.14em; text-transform: uppercase; font-size: 10px; color: var(--text-mute); }
  .quick { border-color: var(--border); background: var(--asanoha); }
  .pill { font-variant-numeric: tabular-nums; }
  .tabs button { transition: color .18s var(--ease), border-color .18s var(--ease); }
  .tabs button.active { border-bottom-color: var(--accent); }
  .modal { animation: inkRise .34s var(--ease) both; }
  .run-panel { background: linear-gradient(180deg, rgba(224,78,57,0.07), rgba(224,78,57,0.015)); }
  .steps .step-n { font-variant-numeric: tabular-nums; }
  .cursor-preview { background: var(--panel); background-image: var(--asanoha); }
  .ghost { transition: color .18s var(--ease), border-color .18s var(--ease); }
  .search svg { position: absolute; left: 13px; top: 50%; transform: translateY(-50%); color: var(--text-mute); width: 16px; height: 16px; }
  .sort {
    display: flex; gap: 2px;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 3px;
    flex: none;
  }
  .sort button {
    background: transparent; border: none;
    color: var(--text-dim); font: inherit;
    padding: 6px 11px; border-radius: 7px;
    font-size: 12px; cursor: pointer; font-weight: 500;
    transition: background .15s, color .15s;
    white-space: nowrap;
  }
  .sort button:hover { color: var(--text); }
  .sort button.active {
    background: var(--panel-2);
    color: var(--text);
    box-shadow: inset 0 0 0 1px var(--border-2);
  }
  .topbar-stats { margin-left: auto; display: flex; gap: 12px; align-items: center; color: var(--text-dim); font-size: 13px; flex: none; }
  .topbar-inner { flex-wrap: nowrap; }
  .logo { flex: none; min-width: 0; }
  /* Shed the optional chrome before anything can be clipped */
  @media (max-width: 900px) { .sort { display: none; } }
  @media (max-width: 700px) { .topbar-stats { display: none; } }
  @media (max-width: 560px) { .logo small { display: none; } }
  .pill { background: var(--panel); border: 1px solid var(--border); padding: 6px 12px; border-radius: 999px; font-size: 12px; }
  .pill strong { color: var(--text); font-weight: 600; }

  /* ---------- Layout ---------- */
  main { max-width: 1320px; margin: 0 auto; padding: 28px 24px 140px; display: grid; grid-template-columns: 240px 1fr; gap: 28px; }
  @media (max-width: 900px) { main { grid-template-columns: 1fr; } aside { position: static !important; } }
  aside { position: sticky; top: 88px; align-self: start; }
  .nav { display: flex; flex-direction: column; gap: 4px; }
  .nav button {
    position: relative; text-align: left;
    background: transparent; border: 1px solid transparent;
    color: var(--text-dim); padding: 9px 12px; border-radius: 10px;
    cursor: pointer; font: inherit; font-size: 13px;
    display: flex; align-items: center; gap: 11px;
    transition: background .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease), transform .2s var(--ease);
  }
  .nav-ico { width: 17px; height: 17px; flex: none; opacity: .72; transition: opacity .2s, transform .3s var(--ease); }
  .nav button:hover { background: var(--panel); color: var(--text); transform: translateX(2px); }
  .nav button:hover .nav-ico { opacity: 1; }
  .nav button.active {
    background: linear-gradient(90deg, rgba(224,78,57,0.13), rgba(224,78,57,0.03));
    border-color: rgba(224,78,57,0.28); color: var(--text);
  }
  .nav button.active .nav-ico { opacity: 1; color: var(--accent); transform: scale(1.06); }
  /* Vermillion tab marker on the active item */
  .nav button.active::before {
    content: ''; position: absolute; left: -1px; top: 50%; transform: translateY(-50%);
    width: 3px; height: 17px; border-radius: 0 3px 3px 0;
    background: var(--accent); box-shadow: 0 0 10px var(--accent-glow);
  }
  .nav-label { display: flex; flex-direction: column; line-height: 1.25; min-width: 0; }
  .nav-label em {
    font-style: normal; font-size: 9.5px; color: var(--text-mute);
    opacity: .78; margin-top: 1px;
  }
  .nav button.active .nav-label em { color: var(--accent-soft); opacity: .85; }
  .nav button .count {
    margin-left: auto; font-size: 10.5px; color: var(--text-mute);
    background: var(--panel); border: 1px solid var(--border);
    padding: 1px 7px; border-radius: 6px; font-variant-numeric: tabular-nums;
    transition: color .2s, border-color .2s;
  }
  .nav button.active .count { color: var(--accent-soft); border-color: rgba(224,78,57,0.32); background: rgba(224,78,57,0.08); }
  .nav h4 {
    color: var(--text-mute); font-size: 10px; font-weight: 600;
    letter-spacing: 0.16em; text-transform: uppercase; margin: 20px 12px 8px;
    display: flex; align-items: center; gap: 8px;
  }
  .nav h4::after { content: ''; flex: 1; height: 1px; background: linear-gradient(90deg, var(--border), transparent); }
  .quick { margin-top: 18px; padding: 14px; border: 1px dashed var(--border-2); border-radius: 12px; }
  .quick h5 { margin: 0 0 8px; font-size: 12px; color: var(--text-dim); font-weight: 600; }
  .quick button { background: var(--panel); color: var(--text); border: 1px solid var(--border); border-radius: 8px; padding: 7px 10px; font-size: 12px; cursor: pointer; margin: 2px 4px 2px 0; }
  .quick button:hover { border-color: var(--accent); color: var(--accent); }

  /* ---------- Hero ---------- */
  @keyframes cardIn {
    from { opacity: 0; transform: translateY(9px) scale(.985); }
    to   { opacity: 1; transform: none; }
  }
  @keyframes inkRise {
    from { opacity: 0; transform: translateY(14px); }
    to   { opacity: 1; transform: none; }
  }
  @media (prefers-reduced-motion: reduce) {
    * { animation: none !important; transition-duration: .01ms !important; }
  }

  .hero { margin-bottom: 26px; animation: inkRise .6s var(--ease) both; }
  .hero .eyebrow {
    display: inline-flex; align-items: center; gap: 9px;
    font-size: 10.5px; letter-spacing: 0.2em; text-transform: uppercase;
    color: var(--text-mute); margin-bottom: 12px;
  }
  .hero .eyebrow::before {
    content: ''; width: 22px; height: 1px;
    background: linear-gradient(90deg, var(--accent), transparent);
  }
  .hero h1 {
    font-size: 34px; letter-spacing: -0.028em; margin: 0 0 10px;
    font-weight: 700; line-height: 1.14;
  }
  .hero h1 .ink { color: var(--accent); }
  .hero p { color: var(--text-dim); margin: 0; font-size: 14px; max-width: 660px; line-height: 1.62; }
  .hero .kbd-hint { margin-top: 14px; font-size: 11.5px; color: var(--text-mute); }

  .section-title {
    display: flex; align-items: baseline; gap: 12px;
    margin: 32px 0 14px; padding-bottom: 9px;
    border-bottom: 1px solid var(--border);
  }
  .section-title h2 {
    font-size: 15px; margin: 0; letter-spacing: 0.01em; font-weight: 600;
    display: flex; align-items: center; gap: 9px;
  }
  .section-title h2::before {
    content: ''; width: 2px; height: 13px; border-radius: 2px;
    background: var(--accent); flex: none;
  }
  .section-title .desc { color: var(--text-mute); font-size: 12px; font-variant-numeric: tabular-nums; }
  .section-title .actions { margin-left: auto; display: flex; gap: 6px; }
  .ghost { background: transparent; border: 1px solid var(--border); color: var(--text-dim); padding: 6px 10px; border-radius: 8px; font-size: 12px; cursor: pointer; }
  .ghost:hover { color: var(--text); border-color: var(--border-2); }