:root {
      --header: #1f3864;
      --bg: #f4f7fb;
      --card: #fff;
      --text: #1a2332;
      --muted: #5a6b7d;
      --border: #d9e2ec;
      --focus: #2563eb;
      --green: #15803d;
      --amber: #d97706;
      --red: #b91c1c;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      font-family: system-ui, -apple-system, "Segoe UI", Roboto, Ubuntu, Cantarell, "Noto Sans", sans-serif;
      background: var(--bg);
      color: var(--text);
      line-height: 1.5;
      min-height: 100vh;
      display: flex;
      flex-direction: column;
    }
    a { color: inherit; }
    header {
      background: var(--header);
      color: #fff;
      box-shadow: 0 2px 8px rgba(0,0,0,.12);
      position: sticky;
      top: 0;
      z-index: 20;
    }
    .header-inner {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0.75rem 1rem;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 0.75rem 1.25rem;
    }
    .site-title {
      font-size: 1.05rem;
      font-weight: 700;
      letter-spacing: 0.02em;
      margin: 0;
    }
    nav {
      display: flex;
      flex-wrap: wrap;
      gap: 0.35rem;
      margin-left: auto;
    }
    nav button {
      background: transparent;
      border: 1px solid rgba(255,255,255,.35);
      color: #fff;
      padding: 0.45rem 0.85rem;
      border-radius: 6px;
      cursor: pointer;
      font-size: 0.9rem;
    }
    nav button:hover { background: rgba(255,255,255,.1); }
    nav button.active {
      background: #fff;
      color: var(--header);
      border-color: #fff;
    }
    nav button:focus-visible {
      outline: 2px solid #fff;
      outline-offset: 2px;
    }
    .layout {
      flex: 1;
      max-width: 1200px;
      margin: 0 auto;
      width: 100%;
      padding: 1.25rem 1rem 2rem;
      display: grid;
      grid-template-columns: 1fr;
      gap: 1.25rem;
    }
    @media (min-width: 960px) {
      .layout {
        grid-template-columns: 1fr 280px;
        align-items: start;
      }
    }
    main { min-width: 0; }
    aside {
      background: var(--card);
      border: 1px solid var(--border);
      border-radius: 12px;
      padding: 1rem;
      font-size: 0.85rem;
      color: var(--muted);
    }
    aside h2 {
      margin: 0 0 0.5rem;
      font-size: 0.95rem;
      color: var(--text);
    }
    section.page-section > h1 {
      margin: 0 0 0.35rem;
      font-size: 1.35rem;
    }
    .card-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
      gap: 1rem;
    }
    .card {
      background: var(--card);
      border: 1px solid var(--border);
      border-radius: 12px;
      padding: 1.25rem;
      box-shadow: 0 1px 3px rgba(31,56,100,.06);
      display: flex;
      flex-direction: column;
      gap: 0.5rem;
    }
    .card h2 { margin: 0; font-size: 1.1rem; }
    .card p { margin: 0; color: var(--muted); font-size: 0.92rem; flex: 1; }
    .card-actions { margin-top: 0.5rem; }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.35rem;
      padding: 0.55rem 1rem;
      border-radius: 8px;
      border: 1px solid var(--header);
      background: var(--header);
      color: #fff;
      font-weight: 600;
      font-size: 0.9rem;
      cursor: pointer;
    }
    .btn:hover { filter: brightness(1.08); }
    .btn:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
    .btn-secondary {
      background: #fff;
      color: var(--header);
    }
    .btn:disabled {
      opacity: 0.55;
      cursor: not-allowed;
      filter: none;
    }
    .card.coming-soon { opacity: 0.92; }
    .page-intro {
      margin: 0 0 1.25rem;
      color: var(--muted);
      font-size: 0.98rem;
      max-width: 52rem;
    }
    .category-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 1rem;
    }
    .category-card {
      background: var(--card);
      border: 1px solid var(--border);
      border-radius: 12px;
      padding: 1.5rem;
      box-shadow: 0 1px 3px rgba(31,56,100,.06);
      display: flex;
      flex-direction: column;
      gap: 0.65rem;
    }
    .category-card h2 { margin: 0; font-size: 1.25rem; }
    .category-card p { margin: 0; color: var(--muted); font-size: 0.92rem; flex: 1; }
    .category-card .tag { align-self: flex-start; }
    .category-actions { margin-top: 0.35rem; }
    .tag {
      display: inline-block;
      font-size: 0.7rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.06em;
      background: #e8eef6;
      color: var(--header);
      padding: 0.2rem 0.45rem;
      border-radius: 4px;
    }
    .panel {
      background: var(--card);
      border: 1px solid var(--border);
      border-radius: 12px;
      padding: 1.25rem 1.25rem 1.5rem;
      box-shadow: 0 1px 3px rgba(31,56,100,.06);
    }
    .panel h1 {
      margin: 0 0 0.35rem;
      font-size: 1.35rem;
    }
    .panel .lead { margin: 0 0 1rem; color: var(--muted); font-size: 0.95rem; }
    .form-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
      gap: 1rem;
    }
    label {
      display: block;
      font-size: 0.8rem;
      font-weight: 600;
      color: var(--muted);
      margin-bottom: 0.25rem;
    }
    select, input[type="number"], input[type="text"], input[type="email"], textarea {
      width: 100%;
      padding: 0.5rem 0.6rem;
      border: 1px solid var(--border);
      border-radius: 8px;
      font-size: 0.95rem;
      background: #fff;
      font-family: inherit;
    }
    textarea { min-height: 140px; resize: vertical; line-height: 1.45; }
    select:focus-visible, input:focus-visible, textarea:focus-visible {
      outline: 2px solid var(--focus);
      outline-offset: 1px;
    }
    .slider-row {
      grid-column: 1 / -1;
    }
    .slider-head {
      display: flex;
      justify-content: space-between;
      align-items: baseline;
      gap: 0.5rem;
    }
    input[type="range"] {
      width: 100%;
      margin-top: 0.35rem;
    }
    .preset-row {
      display: flex;
      flex-wrap: wrap;
      gap: 0.4rem;
      margin-top: 0.35rem;
    }
    .preset-row button {
      font-size: 0.78rem;
      padding: 0.35rem 0.55rem;
      border-radius: 6px;
      border: 1px solid var(--border);
      background: #f8fafc;
      cursor: pointer;
    }
    .preset-row button.active {
      border-color: var(--header);
      background: #e8eef6;
      font-weight: 600;
    }
    .preset-row button:focus-visible {
      outline: 2px solid var(--focus);
      outline-offset: 1px;
    }
    .outputs {
      margin-top: 1.25rem;
      padding-top: 1.25rem;
      border-top: 1px solid var(--border);
    }
    .outputs h2 { margin: 0 0 0.75rem; font-size: 1.05rem; }
    .out-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
      gap: 0.75rem;
    }
    .out-item {
      background: #f8fafc;
      border: 1px solid var(--border);
      border-radius: 8px;
      padding: 0.65rem 0.75rem;
    }
    .out-item .k { font-size: 0.72rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.04em; }
    .out-item .v { font-size: 1.15rem; font-weight: 700; }
    .badge-row {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 0.75rem;
      margin: 1rem 0 0.5rem;
    }
    .badge {
      display: inline-flex;
      align-items: center;
      padding: 0.35rem 0.65rem;
      border-radius: 6px;
      font-weight: 700;
      font-size: 0.8rem;
    }
    .badge.ok { background: #dcfce7; color: var(--green); }
    .badge.bad { background: #fee2e2; color: var(--red); }
    .util-wrap { flex: 1; min-width: 200px; }
    .util-label { font-size: 0.8rem; color: var(--muted); margin-bottom: 0.25rem; }
    .util-track {
      height: 12px;
      border-radius: 6px;
      background: #e2e8f0;
      overflow: hidden;
    }
    .util-fill {
      height: 100%;
      border-radius: 6px;
      width: 0%;
      transition: width 0.2s ease;
    }
    .util-fill.green { background: linear-gradient(90deg, #22c55e, #16a34a); }
    .util-fill.amber { background: linear-gradient(90deg, #fbbf24, #d97706); }
    .util-fill.red { background: linear-gradient(90deg, #f87171, #b91c1c); }
    .msg-error {
      margin-top: 0.75rem;
      padding: 0.65rem 0.75rem;
      background: #fef2f2;
      border: 1px solid #fecaca;
      border-radius: 8px;
      color: #991b1b;
      font-size: 0.9rem;
    }
    .msg-endurance-warn {
      margin: 0.75rem 0;
      padding: 0.75rem 0.85rem;
      background: #eff6ff;
      border: 1px solid #93c5fd;
      border-radius: 8px;
      color: #1e40af;
      font-size: 0.9rem;
      line-height: 1.45;
    }
    .msg-endurance-warn strong { display: block; margin-bottom: 0.35rem; }
    .msg-endurance-warn p { margin: 0; }
    .msg-success {
      margin-top: 0.75rem;
      padding: 0.65rem 0.75rem;
      background: #f0fdf4;
      border: 1px solid #bbf7d0;
      border-radius: 8px;
      color: #166534;
      font-size: 0.9rem;
    }
    .contact-panel { max-width: 640px; }
    .contact-form { margin-top: 1.25rem; }
    .contact-row {
      display: grid;
      grid-template-columns: minmax(7rem, 9rem) 1fr;
      gap: 0.75rem 1rem;
      align-items: start;
      margin-bottom: 1rem;
    }
    @media (max-width: 540px) {
      .contact-row { grid-template-columns: 1fr; gap: 0.35rem; }
    }
    .contact-row label {
      margin: 0.55rem 0 0;
      text-align: right;
      color: var(--text);
    }
    @media (max-width: 540px) {
      .contact-row label { text-align: left; margin-top: 0; }
    }
    .contact-row .req { color: var(--red); }
    .contact-actions {
      display: grid;
      grid-template-columns: minmax(7rem, 9rem) 1fr;
      gap: 0.75rem 1rem;
      margin-top: 0.25rem;
    }
    @media (max-width: 540px) {
      .contact-actions { grid-template-columns: 1fr; }
    }
    .contact-actions .btn { justify-self: start; }
    .contact-divider {
      margin: 2rem 0 1.25rem;
      border: 0;
      border-top: 1px solid var(--border);
    }
    .contact-email h2 {
      margin: 0 0 0.35rem;
      font-size: 1.05rem;
      color: var(--header);
    }
    .contact-email p { margin: 0; color: var(--muted); font-size: 0.92rem; }
    .contact-email a { color: var(--focus); }
    footer {
      margin-top: auto;
      padding: 1rem;
      text-align: center;
      font-size: 0.82rem;
      color: var(--muted);
      border-top: 1px solid var(--border);
      background: #fff;
    }
    .back-row { margin-bottom: 1rem; }
    .calc-section {
      margin-top: 1.25rem;
      padding-top: 1rem;
      border-top: 1px solid var(--border);
    }
    .calc-section:first-of-type { margin-top: 0; padding-top: 0; border-top: none; }
    .section-tag {
      display: inline-block;
      font-size: 0.7rem;
      font-weight: 700;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      color: var(--header);
      background: #e8eef6;
      padding: 0.2rem 0.5rem;
      border-radius: 4px;
      margin-bottom: 0.5rem;
    }
    .calc-section > h2 {
      margin: 0 0 0.75rem;
      font-size: 0.95rem;
      font-weight: 700;
    }
    .input-yellow select,
    .input-yellow input[type="number"],
    .input-yellow input[type="range"] {
      background: #fffbeb;
      border-color: #fcd34d;
    }
    .param-grid {
      display: grid;
      grid-template-columns: 1fr;
      gap: 1rem;
    }
    @media (min-width: 720px) {
      .param-grid { grid-template-columns: 1fr 1fr; }
    }
    .param-table {
      width: 100%;
      border-collapse: collapse;
      font-size: 0.88rem;
    }
    .param-table th {
      text-align: left;
      font-size: 0.75rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.04em;
      color: var(--muted);
      padding: 0 0 0.4rem;
      border-bottom: 1px solid var(--border);
    }
    .param-table td {
      padding: 0.35rem 0;
      border-bottom: 1px solid #eef2f6;
    }
    .param-table td:last-child {
      text-align: right;
      font-weight: 600;
      font-variant-numeric: tabular-nums;
    }
    .key-results {
      display: grid;
      grid-template-columns: repeat(5, minmax(0, 1fr));
      gap: 0.75rem;
      align-items: stretch;
    }
    .key-results.cols-4 {
      grid-template-columns: repeat(4, minmax(0, 1fr));
    }
    @media (max-width: 900px) {
      .key-results,
      .key-results.cols-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    }
    @media (max-width: 480px) {
      .key-results { grid-template-columns: 1fr; }
    }
    .key-box {
      display: flex;
      flex-direction: column;
      background: linear-gradient(135deg, #1f3864 0%, #2d4a7c 100%);
      color: #fff;
      border-radius: 10px;
      padding: 0.85rem 1rem;
    }
    .key-box.warn { background: linear-gradient(135deg, #7f1d1d 0%, #b91c1c 100%); }
    .key-box .k {
      flex: 1 1 auto;
      font-size: 0.68rem;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      opacity: 0.88;
      line-height: 1.3;
    }
    .key-box .v {
      display: flex;
      align-items: baseline;
      justify-content: flex-end;
      gap: 0.35rem;
      margin-top: 0.5rem;
      font-size: 1.45rem;
      font-weight: 700;
      font-variant-numeric: tabular-nums;
      white-space: nowrap;
    }
    .key-box .v .val {
      min-width: 6.5ch;
      text-align: right;
    }
    .key-box .v .unit {
      flex: 0 0 2.25rem;
      font-size: 0.72em;
      font-weight: 600;
      opacity: 0.9;
    }
    .breakdown-table {
      width: 100%;
      border-collapse: collapse;
      font-size: 0.88rem;
    }
    .breakdown-table th,
    .breakdown-table td {
      padding: 0.45rem 0.5rem;
      border-bottom: 1px solid var(--border);
      text-align: left;
    }
    .breakdown-table th {
      font-size: 0.72rem;
      text-transform: uppercase;
      letter-spacing: 0.04em;
      color: var(--muted);
      background: #f8fafc;
    }
    .breakdown-table td.num {
      text-align: right;
      font-weight: 600;
      font-variant-numeric: tabular-nums;
      white-space: nowrap;
    }
    .breakdown-table tr.total td {
      font-weight: 700;
      background: #f0f4fa;
    }
    .breakdown-table .notes {
      color: var(--muted);
      font-size: 0.8rem;
    }
    .status-row {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 0.75rem;
      margin-top: 1rem;
    }
    .status-row .util-wrap { flex: 1; min-width: 180px; }
    .calc-footnotes {
      margin-top: 1rem;
      font-size: 0.8rem;
      color: var(--muted);
    }
    .calc-footnotes p { margin: 0.25rem 0; }
    
    nav button { font-size: 0.78rem; padding: 0.4rem 0.6rem; }
    .jd-visual-wrap {
      margin-top: 1.25rem;
      border: 1px solid var(--border);
      border-radius: 10px;
      background: linear-gradient(180deg, #fafbfd 0%, #f4f7fb 100%);
      padding: 1rem;
      overflow-x: auto;
    }
    .jd-visual svg {
      display: block;
      width: 100%;
      max-width: 820px;
      min-width: 520px;
      height: auto;
    }
    .jd-visual-caption {
      margin: 0.65rem 0 0;
      font-size: 0.78rem;
      color: var(--muted);
      max-width: 820px;
    }

    .mu-hint { margin: 0.25rem 0 0; font-size: 0.75rem; color: var(--muted); }
  
    nav a {
      display: inline-flex;
      align-items: center;
      background: transparent;
      border: 1px solid rgba(255,255,255,.35);
      color: #fff;
      padding: 0.45rem 0.85rem;
      border-radius: 6px;
      font-size: 0.78rem;
      text-decoration: none;
    }
    nav a:hover { background: rgba(255,255,255,.1); }
    nav a.active {
      background: #fff;
      color: var(--header);
      border-color: #fff;
    }
    nav a:focus-visible {
      outline: 2px solid #fff;
      outline-offset: 2px;
    }
    .back-row a.btn { text-decoration: none; }