:root {
      --ink: #0e1a1f;
      --ink-soft: #1a2e36;
      --paper: #e8efe8;
      --mist: #c5d4c8;
      --brass: #b8893d;
      --brass-bright: #d4a84b;
      --line: rgba(184, 137, 61, 0.35);
      --muted: #5c7268;
      --white: #f4f7f4;
      --ease: cubic-bezier(0.22, 1, 0.36, 1);
    }

    * { box-sizing: border-box; margin: 0; padding: 0; }

    html { scroll-behavior: smooth; }

    body {
      font-family: "Noto Sans SC", sans-serif;
      color: var(--ink);
      background: var(--paper);
      line-height: 1.7;
      font-weight: 400;
      overflow-x: hidden;
    }

    a { color: inherit; text-decoration: none; }
    img { max-width: 100%; display: block; }

    /* —— Nav —— */
    .nav {
      position: fixed;
      inset: 0 0 auto;
      z-index: 40;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 1.1rem 6vw;
      background: linear-gradient(180deg, rgba(14, 26, 31, 0.88), rgba(14, 26, 31, 0));
      color: var(--white);
      mix-blend-mode: normal;
      pointer-events: none;
    }
    .nav a, .nav .brand { pointer-events: auto; }
    .nav .brand {
      font-family: "Instrument Serif", "Noto Serif SC", serif;
      font-size: 1.35rem;
      letter-spacing: 0.04em;
    }
    .nav-links {
      display: flex;
      gap: 1.6rem;
      font-size: 0.88rem;
      font-weight: 500;
    }
    .nav-links a {
      opacity: 0.82;
      transition: opacity 0.25s var(--ease);
    }
    .nav-links a:hover { opacity: 1; }
    .nav-right {
      display: flex;
      align-items: center;
      gap: 1.25rem;
      pointer-events: auto;
    }
    .lang-switch {
      display: inline-flex;
      align-items: center;
      gap: 0.1rem;
      border: 1px solid rgba(244, 247, 244, 0.28);
      padding: 0.12rem;
      background: rgba(14, 26, 31, 0.35);
    }
    .lang-switch button {
      appearance: none;
      border: 0;
      background: transparent;
      color: rgba(244, 247, 244, 0.68);
      font-family: inherit;
      font-size: 0.76rem;
      font-weight: 600;
      letter-spacing: 0.04em;
      padding: 0.32rem 0.55rem;
      cursor: pointer;
      transition: background 0.2s var(--ease), color 0.2s var(--ease);
    }
    .lang-switch button:hover { color: var(--white); }
    .lang-switch button.active {
      background: rgba(184, 137, 61, 0.4);
      color: var(--brass-bright);
    }
    html[lang="en"] .trial-path li {
      grid-template-columns: 6.2rem 1fr;
    }
    html[lang="en"] .about-strengths li {
      grid-template-columns: 5.8rem 1fr;
    }
    html[lang="en"] .oss-list li {
      grid-template-columns: 8.5rem 1fr;
    }

    /* —— Hero —— */
    .hero {
      position: relative;
      min-height: 100vh;
      min-height: 100dvh;
      display: flex;
      flex-direction: column;
      justify-content: flex-end;
      padding: 0 6vw 12vh;
      color: var(--white);
      background:
        radial-gradient(ellipse 90% 70% at 70% 20%, rgba(184, 137, 61, 0.22), transparent 55%),
        radial-gradient(ellipse 60% 50% at 10% 80%, rgba(60, 110, 90, 0.35), transparent 50%),
        linear-gradient(165deg, #071114 0%, #12262c 42%, #0e1a1f 100%);
      overflow: hidden;
    }

    .hero-grid {
      position: absolute;
      inset: -10%;
      background-image:
        linear-gradient(rgba(232, 239, 232, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(232, 239, 232, 0.05) 1px, transparent 1px);
      background-size: 64px 64px;
      transform: perspective(600px) rotateX(52deg) scale(1.4);
      transform-origin: center top;
      animation: gridDrift 28s linear infinite;
      pointer-events: none;
      opacity: 0.55;
    }

    @keyframes gridDrift {
      from { background-position: 0 0; }
      to { background-position: 64px 64px; }
    }

    .hero-orbit {
      position: absolute;
      width: min(72vw, 640px);
      aspect-ratio: 1;
      right: -8vw;
      top: 8vh;
      border: 1px solid rgba(184, 137, 61, 0.28);
      border-radius: 50%;
      pointer-events: none;
      animation: spinSlow 80s linear infinite;
    }
    .hero-orbit::before {
      content: "";
      position: absolute;
      width: 10px;
      height: 10px;
      background: var(--brass-bright);
      border-radius: 50%;
      top: 12%;
      left: 50%;
      box-shadow: 0 0 24px rgba(212, 168, 75, 0.7);
    }
    @keyframes spinSlow { to { transform: rotate(360deg); } }

    .hero-inner { position: relative; z-index: 2; max-width: 52rem; }

    .hero-brand {
      font-family: "Instrument Serif", "Noto Serif SC", serif;
      font-size: clamp(3.2rem, 10vw, 6.8rem);
      line-height: 0.92;
      letter-spacing: -0.02em;
      margin-bottom: 0.35rem;
      animation: rise 1s var(--ease) both;
    }

    .hero-alias {
      font-family: "Noto Serif SC", "Instrument Serif", serif;
      font-size: clamp(1.65rem, 3.8vw, 2.45rem);
      font-weight: 700;
      color: var(--brass-bright);
      letter-spacing: 0.28em;
      margin-bottom: 1.35rem;
      animation: rise 1s var(--ease) 0.06s both;
    }

    .hero-line {
      font-family: "Noto Serif SC", serif;
      font-size: clamp(1.35rem, 3.2vw, 2rem);
      font-weight: 600;
      max-width: 18em;
      margin-bottom: 0.85rem;
      animation: rise 1s var(--ease) 0.12s both;
    }

    .hero-sub {
      font-size: clamp(0.95rem, 1.6vw, 1.1rem);
      color: rgba(244, 247, 244, 0.78);
      max-width: 28em;
      margin-bottom: 2rem;
      animation: rise 1s var(--ease) 0.22s both;
    }

    .hero-cta {
      display: flex;
      flex-wrap: wrap;
      gap: 0.85rem 1rem;
      animation: rise 1s var(--ease) 0.32s both;
    }

    @keyframes rise {
      from { opacity: 0; transform: translateY(28px); }
      to { opacity: 1; transform: translateY(0); }
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 0.85rem 1.55rem;
      font-size: 0.95rem;
      font-weight: 500;
      border: 1px solid transparent;
      cursor: pointer;
      transition: transform 0.25s var(--ease), background 0.25s, border-color 0.25s, color 0.25s;
    }
    .btn:hover { transform: translateY(-2px); }
    .btn-primary {
      background: var(--brass);
      color: var(--ink);
    }
    .btn-primary:hover { background: var(--brass-bright); }
    .btn-ghost {
      background: transparent;
      color: var(--white);
      border-color: rgba(244, 247, 244, 0.35);
    }
    .btn-ghost:hover { border-color: var(--brass-bright); color: var(--brass-bright); }

    .scroll-hint {
      position: absolute;
      bottom: 2.2rem;
      left: 6vw;
      font-size: 0.75rem;
      letter-spacing: 0.18em;
      text-transform: uppercase;
      color: rgba(244, 247, 244, 0.45);
      z-index: 2;
    }

    /* —— Sections —— */
    section {
      padding: 6.5rem 6vw;
    }

    .section-label {
      font-size: 0.78rem;
      letter-spacing: 0.22em;
      text-transform: uppercase;
      color: var(--brass);
      font-weight: 500;
      margin-bottom: 0.9rem;
    }

    .section-title {
      font-family: "Noto Serif SC", serif;
      font-size: clamp(1.75rem, 3.5vw, 2.55rem);
      font-weight: 700;
      line-height: 1.25;
      margin-bottom: 1.1rem;
      max-width: 16em;
    }

    .section-lead {
      color: var(--muted);
      font-size: 1.05rem;
      max-width: 36em;
      margin-bottom: 2.4rem;
    }

    .reveal {
      opacity: 0;
      transform: translateY(36px);
      transition: opacity 0.9s var(--ease), transform 0.9s var(--ease);
    }
    .reveal.in {
      opacity: 1;
      transform: translateY(0);
    }

    /* Trial */
    #trial {
      background: var(--ink);
      color: var(--white);
    }
    #trial .section-lead { color: rgba(244, 247, 244, 0.65); }
    .trial-panel {
      border: 1px solid var(--line);
      padding: 2.8rem 2rem;
      max-width: 46rem;
      margin: 1.25rem 0 1.75rem;
      background:
        linear-gradient(135deg, rgba(184, 137, 61, 0.08), transparent 55%),
        rgba(26, 46, 54, 0.6);
    }
    .trial-status {
      font-family: "Instrument Serif", "Noto Serif SC", serif;
      font-size: clamp(2rem, 5vw, 3.2rem);
      font-style: italic;
      color: var(--brass-bright);
      margin-bottom: 0.75rem;
    }
    .trial-note {
      color: rgba(244, 247, 244, 0.72);
      max-width: 38em;
      line-height: 1.75;
    }
    .trial-note + .trial-note { margin-top: 1rem; }
    .trial-path {
      list-style: none;
      margin: 1.6rem 0 0;
      padding: 0;
      display: grid;
      gap: 0.85rem;
    }
    .trial-path li {
      display: grid;
      grid-template-columns: 4.5rem 1fr;
      gap: 0.85rem;
      align-items: start;
      padding-top: 0.85rem;
      border-top: 1px solid rgba(244, 247, 244, 0.1);
      font-size: 0.92rem;
      line-height: 1.65;
      color: rgba(244, 247, 244, 0.72);
    }
    .trial-path .step {
      font-family: "Instrument Serif", "Noto Serif SC", serif;
      font-size: 0.95rem;
      font-style: italic;
      letter-spacing: 0.04em;
      color: var(--brass-bright);
      padding-top: 0.05rem;
    }
    .trial-path strong {
      color: rgba(244, 247, 244, 0.92);
      font-weight: 600;
    }

    /* Capabilities */
    #capabilities {
      background:
        linear-gradient(180deg, #e8efe8 0%, #dfe8e1 100%);
    }
    .cap-list {
      list-style: none;
      display: grid;
      gap: 0;
      border-top: 1px solid rgba(14, 26, 31, 0.12);
    }
    .cap-list li {
      display: grid;
      grid-template-columns: 4.5rem 1fr;
      gap: 1.2rem;
      padding: 1.55rem 0;
      border-bottom: 1px solid rgba(14, 26, 31, 0.12);
      align-items: baseline;
    }
    .cap-num {
      font-family: "Instrument Serif", serif;
      font-size: 1.35rem;
      color: var(--brass);
    }
    .cap-list h3 {
      font-family: "Noto Serif SC", serif;
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 0.35rem;
    }
    .cap-list p { color: var(--muted); max-width: 38em; }

    /* —— Kernel / embed —— */
    #kernel {
      background:
        linear-gradient(160deg, #e4ebe4 0%, var(--paper) 42%, #f2ebe2 100%);
    }
    .kernel-tagline {
      font-family: "Noto Serif SC", "Instrument Serif", serif;
      font-size: clamp(1.2rem, 2.4vw, 1.55rem);
      font-weight: 600;
      line-height: 1.5;
      max-width: 22em;
      margin: 0 0 1.25rem;
      color: var(--ink);
    }
    .kernel-points {
      list-style: none;
      display: grid;
      gap: 0.85rem;
      max-width: 40em;
      margin-bottom: 2rem;
    }
    .kernel-points li {
      display: grid;
      grid-template-columns: 5.5rem 1fr;
      gap: 0.85rem;
      align-items: start;
      padding-bottom: 0.85rem;
      border-bottom: 1px solid rgba(14, 26, 31, 0.1);
    }
    .kernel-points .k {
      font-size: 0.78rem;
      font-weight: 700;
      letter-spacing: 0.06em;
      text-transform: uppercase;
      color: var(--brass);
      padding-top: 0.15rem;
    }
    .kernel-points .v {
      color: var(--muted);
      font-size: 0.95rem;
      line-height: 1.65;
    }
    html[lang="en"] .kernel-points li {
      grid-template-columns: 6.5rem 1fr;
    }
    .kernel-orbit {
      position: relative;
      min-height: 22rem;
      margin: 0.5rem 0 1.5rem;
      display: grid;
      place-items: center;
    }
    .kernel-hub {
      position: relative;
      z-index: 2;
      width: min(11.5rem, 42vw);
      aspect-ratio: 1;
      border-radius: 50%;
      display: grid;
      place-items: center;
      text-align: center;
      padding: 1rem;
      background:
        radial-gradient(circle at 35% 30%, rgba(212, 168, 75, 0.35), transparent 55%),
        linear-gradient(160deg, #1a2e36, #0e1a1f);
      color: var(--white);
      box-shadow:
        0 0 0 1px rgba(212, 168, 75, 0.35),
        0 0 40px rgba(14, 26, 31, 0.18);
      animation: kernel-pulse 4.5s var(--ease) infinite;
    }
    .kernel-hub strong {
      display: block;
      font-family: "Instrument Serif", "Noto Serif SC", serif;
      font-size: 1.25rem;
      font-weight: 400;
      letter-spacing: 0.02em;
    }
    .kernel-hub span {
      display: block;
      margin-top: 0.35rem;
      font-size: 0.72rem;
      line-height: 1.4;
      color: rgba(244, 247, 244, 0.65);
    }
    @keyframes kernel-pulse {
      0%, 100% { box-shadow: 0 0 0 1px rgba(212, 168, 75, 0.35), 0 0 40px rgba(14, 26, 31, 0.18); }
      50% { box-shadow: 0 0 0 1px rgba(212, 168, 75, 0.55), 0 0 52px rgba(184, 137, 61, 0.22); }
    }
    .kernel-ring {
      position: absolute;
      inset: 8% 6%;
      border: 1px dashed rgba(14, 26, 31, 0.14);
      border-radius: 50%;
      pointer-events: none;
      z-index: 0;
    }
    .kernel-ring::before {
      content: "";
      position: absolute;
      inset: 14%;
      border: 1px solid rgba(184, 137, 61, 0.18);
      border-radius: 50%;
    }
    .kernel-nodes {
      position: absolute;
      inset: 0;
      z-index: 1;
      pointer-events: none;
    }
    .kernel-node {
      position: absolute;
      pointer-events: auto;
      max-width: 8.5rem;
      padding: 0.55rem 0.7rem;
      background: rgba(244, 247, 244, 0.92);
      border: 1px solid rgba(14, 26, 31, 0.1);
      box-shadow: 0 8px 24px rgba(14, 26, 31, 0.06);
      transition: transform 0.25s var(--ease), border-color 0.25s var(--ease);
    }
    .kernel-node:hover {
      border-color: rgba(184, 137, 61, 0.45);
    }
    .kernel-node.n1:hover { transform: translateX(-50%) translateY(-2px); }
    .kernel-node.n2:hover,
    .kernel-node.n3:hover,
    .kernel-node.n4:hover,
    .kernel-node.n5:hover { transform: translateY(-2px); }
    .kernel-node .name {
      display: block;
      font-weight: 600;
      font-size: 0.88rem;
      color: var(--ink);
      line-height: 1.35;
    }
    .kernel-node .meta {
      display: block;
      margin-top: 0.2rem;
      font-size: 0.72rem;
      color: var(--muted);
      line-height: 1.4;
    }
    .kernel-node .badge {
      display: inline-block;
      margin-top: 0.35rem;
      font-size: 0.65rem;
      font-weight: 700;
      letter-spacing: 0.04em;
      color: var(--brass);
      text-transform: uppercase;
    }
    .kernel-node.n1 { top: 4%; left: 50%; transform: translateX(-50%); }
    .kernel-node.n2 { top: 28%; right: 2%; }
    .kernel-node.n3 { bottom: 10%; right: 12%; }
    .kernel-node.n4 { bottom: 10%; left: 12%; }
    .kernel-node.n5 { top: 28%; left: 2%; }
    @media (max-width: 720px) {
      .kernel-orbit {
        min-height: 0;
        display: block;
      }
      .kernel-hub {
        width: 100%;
        max-width: 16rem;
        aspect-ratio: auto;
        border-radius: 0.15rem;
        margin: 0 auto 1.25rem;
        padding: 1.1rem 1.25rem;
      }
      .kernel-ring { display: none; }
      .kernel-nodes {
        position: static;
        display: grid;
        gap: 0.65rem;
      }
      .kernel-node {
        position: static;
        max-width: none;
      }
      .kernel-node.n1,
      .kernel-node.n2,
      .kernel-node.n3,
      .kernel-node.n4,
      .kernel-node.n5 { transform: none; }
    }
    .kernel-foot {
      color: var(--muted);
      font-size: 0.9rem;
      max-width: 44em;
      line-height: 1.65;
    }

    /* Outlook */
    #outlook {
      background: var(--ink-soft);
      color: var(--white);
      position: relative;
      overflow: hidden;
    }
    #outlook::after {
      content: "";
      position: absolute;
      inset: 0;
      background:
        radial-gradient(circle at 85% 30%, rgba(184, 137, 61, 0.15), transparent 40%),
        repeating-linear-gradient(
          -12deg,
          transparent,
          transparent 18px,
          rgba(232, 239, 232, 0.03) 18px,
          rgba(232, 239, 232, 0.03) 19px
        );
      pointer-events: none;
    }
    #outlook .inner { position: relative; z-index: 1; }
    #outlook .section-lead { color: rgba(244, 247, 244, 0.68); max-width: 42em; }
    .outlook-hero {
      max-width: 42em;
      margin-bottom: 2rem;
      color: rgba(244, 247, 244, 0.78);
      line-height: 1.75;
    }
    .outlook-hero strong {
      color: rgba(244, 247, 244, 0.95);
      font-weight: 600;
    }
    .outlook-grid {
      list-style: none;
      display: grid;
      gap: 1rem;
      grid-template-columns: 1fr;
    }
    @media (min-width: 720px) {
      .outlook-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (min-width: 1100px) {
      .outlook-grid { grid-template-columns: repeat(3, 1fr); }
    }
    .outlook-grid li {
      border: 1px solid rgba(184, 137, 61, 0.28);
      padding: 1.35rem 1.25rem;
      background: rgba(14, 26, 31, 0.35);
    }
    .outlook-grid .k {
      display: block;
      font-size: 0.75rem;
      letter-spacing: 0.12em;
      text-transform: uppercase;
      color: var(--brass-bright);
      margin-bottom: 0.55rem;
    }
    .outlook-grid h3 {
      font-family: "Noto Serif SC", serif;
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 0.45rem;
      color: var(--white);
    }
    .outlook-grid p {
      color: rgba(244, 247, 244, 0.68);
      font-size: 0.92rem;
      line-height: 1.65;
    }
    .outlook-foot {
      margin-top: 1.75rem;
      max-width: 40em;
      color: rgba(244, 247, 244, 0.58);
      font-size: 0.9rem;
      line-height: 1.65;
    }

    /* FAQ */
    #faq {
      background:
        linear-gradient(165deg, #eef3ee 0%, var(--paper) 55%, #f3efe8 100%);
    }
    .faq-list {
      margin-top: 1.75rem;
      max-width: 42em;
      display: flex;
      flex-direction: column;
      gap: 0.65rem;
    }
    .faq-list details {
      border: 1px solid rgba(14, 26, 31, 0.12);
      background: rgba(255, 255, 255, 0.55);
      padding: 0.85rem 1.1rem;
    }
    .faq-list summary {
      cursor: pointer;
      font-weight: 600;
      color: var(--ink);
      list-style: none;
      line-height: 1.45;
    }
    .faq-list summary::-webkit-details-marker {
      display: none;
    }
    .faq-list summary::before {
      content: "+";
      display: inline-block;
      width: 1.1em;
      color: var(--brass);
      font-weight: 700;
      margin-right: 0.35rem;
    }
    .faq-list details[open] summary::before {
      content: "–";
    }
    .faq-list details p {
      margin: 0.75rem 0 0.15rem;
      color: var(--muted);
      font-size: 0.95rem;
      line-height: 1.7;
    }

    /* Belief */
    #belief {
      background: var(--paper);
    }
    .belief-quote {
      font-family: "Noto Serif SC", serif;
      font-size: clamp(1.35rem, 3vw, 1.9rem);
      font-weight: 600;
      line-height: 1.55;
      max-width: 18em;
      margin: 0 0 1.5rem;
      border-left: 3px solid var(--brass);
      padding-left: 1.25rem;
    }
    .belief-body {
      color: var(--muted);
      max-width: 38em;
      display: flex;
      flex-direction: column;
      gap: 1rem;
    }

    /* About */
    #about {
      background:
        linear-gradient(120deg, #d9e4da 0%, #e8efe8 45%, #f0ebe3 100%);
    }
    .about-grid {
      display: grid;
      grid-template-columns: 1fr;
      gap: 2.5rem;
      align-items: end;
    }
    @media (min-width: 820px) {
      .about-grid {
        grid-template-columns: 1.1fr 0.9fr;
        gap: 4rem;
      }
      .nav-links { display: flex; }
    }
    @media (max-width: 819px) {
      .nav-links { display: none; }
      .nav-right { gap: 0.6rem; }
    }
    .about-name {
      font-family: "Noto Serif SC", serif;
      font-size: clamp(2.2rem, 5vw, 3.4rem);
      font-weight: 700;
      line-height: 1.1;
      margin-bottom: 0.5rem;
    }
    .about-tag {
      color: var(--brass);
      font-weight: 500;
      margin-bottom: 1.25rem;
    }
    .about-copy {
      color: var(--muted);
      max-width: 32em;
      display: flex;
      flex-direction: column;
      gap: 1rem;
      margin-bottom: 1.4rem;
    }
    .about-strengths {
      list-style: none;
      margin: 0 0 1.8rem;
      border-top: 1px solid rgba(14, 26, 31, 0.15);
    }
    .about-strengths li {
      padding: 0.95rem 0;
      border-bottom: 1px solid rgba(14, 26, 31, 0.15);
      display: grid;
      grid-template-columns: 5.2rem 1fr;
      gap: 0.9rem;
      align-items: baseline;
    }
    .about-strengths .k {
      font-family: "Instrument Serif", "Noto Serif SC", serif;
      color: var(--brass);
      font-size: 0.95rem;
      font-weight: 600;
    }
    .about-strengths .v {
      color: var(--muted);
      font-size: 0.92rem;
      line-height: 1.65;
    }
    .contact-block {
      display: flex;
      flex-direction: column;
      gap: 0.55rem;
      padding-top: 1.4rem;
      border-top: 1px solid rgba(14, 26, 31, 0.15);
    }
    .contact-block a {
      font-size: 1.25rem;
      font-weight: 700;
      letter-spacing: 0.04em;
      color: var(--ink);
    }
    .contact-block a:hover { color: var(--brass); }
    .contact-hint { font-size: 0.9rem; color: var(--muted); }

    .stamp {
      border: 1px solid rgba(14, 26, 31, 0.2);
      padding: 2rem 1.6rem;
      align-self: stretch;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      min-height: 16rem;
      background: rgba(244, 247, 244, 0.55);
    }
    .stamp h3 {
      font-family: "Noto Serif SC", serif;
      font-size: 1.2rem;
      margin-bottom: 1rem;
    }
    .stamp ul {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 0.7rem;
      color: var(--muted);
      font-size: 0.95rem;
    }
    .stamp li::before {
      content: "— ";
      color: var(--brass);
    }

    /* Footer */
    footer {
      background: var(--ink);
      color: rgba(244, 247, 244, 0.55);
      padding: 2.8rem 6vw 2.2rem;
      font-size: 0.82rem;
      text-align: center;
    }
    footer .foot-brand {
      font-family: "Instrument Serif", "Noto Serif SC", serif;
      color: var(--white);
      font-size: 1.2rem;
      margin-bottom: 0.6rem;
    }
    footer a {
      color: rgba(244, 247, 244, 0.7);
      border-bottom: 1px solid transparent;
    }
    footer a:hover {
      color: var(--brass-bright);
      border-bottom-color: var(--brass-bright);
    }
    .beian {
      display: flex;
      flex-wrap: wrap;
      gap: 0.5rem 1.4rem;
      justify-content: center;
      margin-top: 1.1rem;
      align-items: center;
    }
    .beian a {
      display: inline-flex;
      align-items: center;
      gap: 0.35rem;
    }
    .beian-icon {
      width: 16px;
      height: 16px;
      flex-shrink: 0;
    }

    /* —— Knowledge —— */
    #knowledge {
      background: var(--white);
    }
    .kb-intro {
      display: grid;
      gap: 1.2rem;
      max-width: 40em;
      margin-bottom: 2.6rem;
      color: var(--muted);
    }
    .kb-badge {
      display: inline-block;
      font-size: 0.75rem;
      letter-spacing: 0.14em;
      text-transform: uppercase;
      color: var(--brass);
      border: 1px solid var(--line);
      padding: 0.28rem 0.7rem;
      margin-bottom: 0.4rem;
    }
    .kb-grid {
      list-style: none;
      display: grid;
      grid-template-columns: 1fr;
      gap: 1px;
      background: rgba(14, 26, 31, 0.12);
      border: 1px solid rgba(14, 26, 31, 0.12);
    }
    @media (min-width: 720px) {
      .kb-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (min-width: 1100px) {
      .kb-grid { grid-template-columns: 1fr 1fr 1fr; }
    }
    .kb-grid li {
      background: var(--paper);
      padding: 1.5rem 1.35rem 1.65rem;
      display: flex;
      flex-direction: column;
      gap: 0.55rem;
      min-height: 11.5rem;
      transition: background 0.25s var(--ease);
    }
    .kb-grid li:hover { background: #f4f7f4; }
    .kb-meta {
      font-size: 0.78rem;
      color: var(--brass);
      font-weight: 500;
      letter-spacing: 0.04em;
    }
    .kb-grid h3 {
      font-family: "Noto Serif SC", serif;
      font-size: 1.05rem;
      font-weight: 700;
      line-height: 1.35;
    }
    .kb-grid p {
      font-size: 0.9rem;
      color: var(--muted);
      flex: 1;
    }
    .kb-foot {
      margin-top: 1.8rem;
      font-size: 0.92rem;
      color: var(--muted);
      max-width: 42em;
    }

    /* —— Cases —— */
    #cases {
      background: var(--ink-soft);
      color: var(--white);
    }
    #cases .section-lead { color: rgba(244, 247, 244, 0.68); }
    .case-disclaimer {
      display: flex;
      gap: 0.85rem;
      align-items: flex-start;
      max-width: 44em;
      margin-bottom: 2.2rem;
      padding: 1.1rem 1.2rem;
      border: 1px solid rgba(212, 168, 75, 0.45);
      background: rgba(184, 137, 61, 0.1);
      font-size: 0.92rem;
      color: rgba(244, 247, 244, 0.88);
      line-height: 1.65;
    }
    .case-disclaimer strong {
      color: var(--brass-bright);
      font-weight: 700;
      white-space: nowrap;
    }
    .case-story {
      max-width: 46rem;
      border-top: 1px solid rgba(244, 247, 244, 0.12);
      padding-top: 1.8rem;
    }
    .case-org {
      font-size: 0.8rem;
      letter-spacing: 0.16em;
      text-transform: uppercase;
      color: var(--brass-bright);
      margin-bottom: 0.65rem;
    }
    .case-story h3 {
      font-family: "Noto Serif SC", serif;
      font-size: clamp(1.35rem, 2.8vw, 1.85rem);
      font-weight: 700;
      line-height: 1.35;
      margin-bottom: 1.1rem;
      max-width: 18em;
    }
    .case-story p {
      color: rgba(244, 247, 244, 0.72);
      margin-bottom: 1rem;
      max-width: 40em;
    }
    .case-points {
      list-style: none;
      margin: 1.4rem 0 0;
      display: flex;
      flex-direction: column;
      border-top: 1px solid rgba(244, 247, 244, 0.12);
    }
    .case-points li {
      padding: 0.95rem 0;
      border-bottom: 1px solid rgba(244, 247, 244, 0.12);
      display: grid;
      grid-template-columns: 5.5rem 1fr;
      gap: 1rem;
      align-items: baseline;
    }
    .case-points .k {
      font-family: "Instrument Serif", serif;
      color: var(--brass-bright);
      font-size: 0.95rem;
    }
    .case-points .v {
      color: rgba(244, 247, 244, 0.78);
      font-size: 0.95rem;
    }

    /* —— Tools —— */
    #tools {
      background:
        linear-gradient(180deg, #dfe8e1 0%, #e8efe8 100%);
    }
    .tools-split {
      display: grid;
      gap: 2.8rem;
    }
    @media (min-width: 900px) {
      .tools-split {
        grid-template-columns: 1.05fr 0.95fr;
        gap: 4rem;
        align-items: start;
      }
    }
    .tool-block h3 {
      font-family: "Noto Serif SC", serif;
      font-size: 1.25rem;
      margin-bottom: 0.85rem;
    }
    .tool-block > p {
      color: var(--muted);
      margin-bottom: 1.2rem;
      max-width: 36em;
    }
    .tool-topics {
      list-style: none;
      display: flex;
      flex-direction: column;
      border-top: 1px solid rgba(14, 26, 31, 0.12);
    }
    .tool-topics li {
      padding: 1rem 0;
      border-bottom: 1px solid rgba(14, 26, 31, 0.12);
      display: grid;
      gap: 0.25rem;
    }
    .tool-topics strong {
      font-weight: 700;
      font-size: 0.98rem;
    }
    .tool-topics span {
      color: var(--muted);
      font-size: 0.9rem;
    }
    .oss-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 0;
      border-top: 1px solid rgba(14, 26, 31, 0.12);
    }
    .oss-list li {
      padding: 1.05rem 0;
      border-bottom: 1px solid rgba(14, 26, 31, 0.12);
      display: grid;
      grid-template-columns: 7.5rem 1fr;
      gap: 1rem;
      align-items: baseline;
    }
    .oss-list .name {
      font-family: "Instrument Serif", "Noto Serif SC", serif;
      font-size: 1.05rem;
      color: var(--ink);
    }
    .oss-list .desc { color: var(--muted); font-size: 0.9rem; }
    .tools-note {
      margin-top: 2.2rem;
      padding-top: 1.4rem;
      border-top: 1px solid rgba(14, 26, 31, 0.12);
      color: var(--muted);
      font-size: 0.92rem;
      max-width: 44em;
    }

    /* —— Industry Radar —— */
    #radar {
      background:
        radial-gradient(ellipse 70% 50% at 85% 10%, rgba(184, 137, 61, 0.14), transparent 55%),
        linear-gradient(165deg, #0a1519 0%, #12262c 48%, #0e1a1f 100%);
      color: var(--white);
    }
    #radar .section-label { color: var(--brass-bright); }
    #radar .section-title { color: var(--white); }
    #radar .section-lead { color: rgba(244, 247, 244, 0.68); max-width: 42em; }
    .sig-disc {
      margin: 1.25rem 0 2rem;
      max-width: 46em;
      padding: 0.85rem 1rem;
      border-left: 3px solid var(--brass);
      background: rgba(184, 137, 61, 0.08);
      color: rgba(244, 247, 244, 0.62);
      font-size: 0.88rem;
      line-height: 1.65;
    }
    .sig-layout {
      display: grid;
      gap: 2.5rem;
    }
    @media (min-width: 960px) {
      .sig-layout {
        grid-template-columns: 1.05fr 1fr;
        align-items: start;
      }
    }
    .sig-panel h3 {
      font-family: "Noto Serif SC", "Instrument Serif", serif;
      font-size: 1.15rem;
      font-weight: 600;
      margin-bottom: 0.35rem;
    }
    .sig-panel .sig-sub {
      color: rgba(244, 247, 244, 0.55);
      font-size: 0.88rem;
      margin-bottom: 1rem;
      max-width: 36em;
    }
    .sig-legend-row {
      display: flex;
      flex-wrap: wrap;
      gap: 1rem 1.4rem;
      margin: 0.5rem 0 0.75rem;
      font-size: 0.82rem;
      color: rgba(244, 247, 244, 0.7);
    }
    .sig-legend-row span {
      display: inline-flex;
      align-items: center;
      gap: 0.4rem;
    }
    .sig-swatch {
      width: 1.1rem;
      height: 0.22rem;
      display: inline-block;
    }
    .sig-swatch.prod { background: var(--brass-bright); box-shadow: 0 0 8px rgba(212, 168, 75, 0.45); }
    .sig-swatch.chat { background: rgba(120, 160, 150, 0.85); }
    #sig-radar, #sig-trend {
      width: 100%;
      height: auto;
      display: block;
      overflow: visible;
    }
    .sig-ring {
      fill: none;
      stroke: rgba(244, 247, 244, 0.1);
      stroke-width: 1;
    }
    .sig-spoke {
      stroke: rgba(244, 247, 244, 0.1);
      stroke-width: 1;
    }
    .sig-axis {
      fill: rgba(244, 247, 244, 0.72);
      font-size: 11px;
      font-family: "Noto Sans SC", sans-serif;
    }
    .sig-area {
      fill-opacity: 0.22;
      stroke-width: 1.8;
      stroke-linejoin: round;
      transition: opacity 0.6s var(--ease);
    }
    .sig-area-prod {
      fill: rgba(212, 168, 75, 0.45);
      stroke: #d4a84b;
      filter: drop-shadow(0 0 10px rgba(212, 168, 75, 0.25));
    }
    .sig-area-chat {
      fill: rgba(90, 140, 130, 0.28);
      stroke: rgba(140, 185, 175, 0.75);
    }
    .sig-grid { stroke: rgba(244, 247, 244, 0.08); stroke-width: 1; }
    .sig-tick {
      fill: rgba(244, 247, 244, 0.42);
      font-size: 10px;
      font-family: "Noto Sans SC", sans-serif;
    }
    .sig-legend {
      fill: rgba(244, 247, 244, 0.55);
      font-size: 10px;
      font-family: "Noto Sans SC", sans-serif;
    }
    .sig-line {
      fill: none;
      stroke-width: 2;
      stroke-linecap: round;
      stroke-linejoin: round;
    }
    .sig-area-fill { stroke: none; fill-opacity: 0.06; }
    .sig-line-ind, .sig-area-fill.sig-line-ind { stroke: #7a9e8f; fill: #7a9e8f; }
    .sig-line-mbse, .sig-area-fill.sig-line-mbse { stroke: #c4a574; fill: #c4a574; }
    .sig-line-sysml, .sig-area-fill.sig-line-sysml { stroke: #8eb4c8; fill: #8eb4c8; }
    .sig-line-aise, .sig-area-fill.sig-line-aise { stroke: #d4a84b; fill: #d4a84b; }
    .sig-line-agent, .sig-area-fill.sig-line-agent { stroke: #e8c97a; fill: #e8c97a; }
    .sig-wide {
      margin-top: 2.4rem;
      padding-top: 2rem;
      border-top: 1px solid rgba(244, 247, 244, 0.1);
    }
    .sig-eco {
      display: flex;
      flex-direction: column;
      gap: 0.65rem;
      margin-top: 0.75rem;
    }
    .sig-eco-row {
      display: grid;
      grid-template-columns: minmax(7rem, 9.5rem) 1fr 2.2rem;
      gap: 0.75rem;
      align-items: center;
      color: rgba(244, 247, 244, 0.82);
      font-size: 0.9rem;
      transition: color 0.2s var(--ease);
    }
    .sig-eco-row:hover { color: var(--brass-bright); }
    .sig-eco-name { font-weight: 500; }
    .sig-eco-track {
      height: 0.35rem;
      background: rgba(244, 247, 244, 0.08);
      overflow: hidden;
    }
    .sig-eco-fill {
      display: block;
      height: 100%;
      width: 0;
      background: linear-gradient(90deg, rgba(184, 137, 61, 0.55), var(--brass-bright));
      transition: width 1.1s var(--ease);
    }
    .sig-eco-score {
      text-align: right;
      font-variant-numeric: tabular-nums;
      color: rgba(244, 247, 244, 0.5);
      font-size: 0.82rem;
    }
    .sig-flow {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 0.35rem 0.15rem;
      margin-top: 1.1rem;
    }
    .sig-flow-node {
      display: inline-flex;
      flex-direction: column;
      align-items: center;
      gap: 0.4rem;
      min-width: 4.6rem;
      animation: sig-pop 0.7s var(--ease) both;
      animation-delay: calc(var(--i) * 0.08s);
    }
    .sig-flow-dot {
      width: 0.7rem;
      height: 0.7rem;
      border-radius: 50%;
      background: var(--brass-bright);
      box-shadow: 0 0 0 4px rgba(212, 168, 75, 0.15);
    }
    .sig-flow-lab {
      font-size: 0.78rem;
      color: rgba(244, 247, 244, 0.7);
      text-align: center;
      max-width: 5.5rem;
      line-height: 1.35;
    }
    .sig-flow-arrow {
      width: 1.4rem;
      height: 1px;
      margin: 0 0.15rem 1.35rem;
      background: linear-gradient(90deg, rgba(212, 168, 75, 0.15), rgba(212, 168, 75, 0.75));
      position: relative;
    }
    .sig-flow-arrow::after {
      content: "";
      position: absolute;
      right: -1px;
      top: -3px;
      border: 3px solid transparent;
      border-left-color: rgba(212, 168, 75, 0.75);
    }
    @keyframes sig-pop {
      from { opacity: 0; transform: translateY(8px); }
      to { opacity: 1; transform: none; }
    }
    .sig-foot {
      margin-top: 1.75rem;
      color: rgba(244, 247, 244, 0.45);
      font-size: 0.82rem;
      max-width: 48em;
      line-height: 1.65;
    }
    html[lang="en"] .sig-eco-row {
      grid-template-columns: minmax(8rem, 11rem) 1fr 2.2rem;
    }

    /* —— Product matrix —— */
    #products {
      background: var(--paper);
      padding-top: 5rem;
    }
    .prod-grid {
      list-style: none;
      display: grid;
      gap: 1.25rem;
      margin-top: 0.5rem;
    }
    @media (min-width: 900px) {
      .prod-grid { grid-template-columns: repeat(2, 1fr); gap: 1.4rem; }
    }
    @media (min-width: 1100px) {
      .prod-grid { grid-template-columns: repeat(4, 1fr); }
    }
    .prod-card {
      display: flex;
      flex-direction: column;
      gap: 0.65rem;
      padding: 1.35rem 1.4rem 1.5rem;
      background: rgba(255, 255, 255, 0.55);
      border: 1px solid rgba(14, 26, 31, 0.1);
      border-top: 3px solid var(--brass);
      min-height: 100%;
      color: inherit;
      text-decoration: none;
      transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
    }
    .prod-card:hover {
      border-color: rgba(184, 137, 61, 0.45);
      transform: translateY(-2px);
    }
    .prod-card .layer {
      font-size: 0.72rem;
      letter-spacing: 0.14em;
      text-transform: uppercase;
      color: var(--brass);
      font-weight: 700;
    }
    .prod-card h3 {
      font-family: "Noto Serif SC", "Instrument Serif", serif;
      font-size: 1.25rem;
      font-weight: 700;
      line-height: 1.3;
    }
    .prod-card p {
      color: var(--muted);
      font-size: 0.92rem;
      line-height: 1.65;
      flex: 1;
    }
    .prod-card .status {
      font-size: 0.78rem;
      font-weight: 600;
      color: var(--ink-soft);
    }
    .prod-card .prod-link {
      display: inline-flex;
      margin-top: 0.35rem;
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--brass);
      border-bottom: 1px solid transparent;
    }
    .prod-card .prod-link:hover { border-bottom-color: var(--brass); }
    .prod-note {
      margin-top: 1.5rem;
      max-width: 46em;
      color: var(--muted);
      font-size: 0.9rem;
      line-height: 1.65;
    }

    .band-head {
      margin-bottom: 2.5rem;
      padding-bottom: 1.25rem;
      border-bottom: 1px solid rgba(14, 26, 31, 0.12);
    }
    .band-head .band-kicker {
      font-size: 0.78rem;
      letter-spacing: 0.18em;
      text-transform: uppercase;
      color: var(--brass);
      font-weight: 600;
      margin-bottom: 0.5rem;
    }
    .band-head h2 {
      font-family: "Noto Serif SC", serif;
      font-size: clamp(1.55rem, 3vw, 2.1rem);
      font-weight: 700;
      margin-bottom: 0.55rem;
    }
    .band-head p {
      color: var(--muted);
      max-width: 40em;
      font-size: 1.02rem;
    }
    .band-subnav {
      display: flex;
      flex-wrap: wrap;
      gap: 0.65rem 1.1rem;
      margin-top: 1rem;
      font-size: 0.86rem;
      font-weight: 500;
    }
    .band-subnav a {
      color: var(--ink-soft);
      opacity: 0.75;
      border-bottom: 1px solid transparent;
    }
    .band-subnav a:hover {
      opacity: 1;
      color: var(--brass);
      border-bottom-color: var(--brass);
    }

    #ai4mbse {
      padding: 0;
      background: transparent;
    }
    #ai4mbse > .band-wrap {
      padding: 4.5rem 6vw 0;
      background:
        linear-gradient(180deg, #dfe8e0 0%, var(--paper) 18%, var(--paper) 100%);
    }
    #ai4mbse > .band-wrap > .band-head { padding-left: 0; padding-right: 0; }
    #ai4mbse > section {
      /* nested sections already have padding */
    }

    #sim {
      background:
        linear-gradient(165deg, #12262c 0%, #0e1a1f 100%);
      color: var(--white);
    }
    #sim .section-label { color: var(--brass-bright); }
    #sim .section-title { color: var(--white); }
    #sim .section-lead { color: rgba(244, 247, 244, 0.68); }
    .sim-points {
      list-style: none;
      display: grid;
      gap: 1rem;
      max-width: 42em;
      margin-top: 0.5rem;
    }
    .sim-points li {
      padding: 1rem 0;
      border-top: 1px solid rgba(244, 247, 244, 0.12);
      color: rgba(244, 247, 244, 0.72);
      font-size: 0.95rem;
      line-height: 1.65;
    }
    .sim-points strong {
      display: block;
      color: var(--white);
      font-weight: 600;
      margin-bottom: 0.25rem;
    }
    .sim-foot {
      margin-top: 1.5rem;
      color: rgba(244, 247, 244, 0.48);
      font-size: 0.88rem;
      max-width: 44em;
    }

    .hero-platform {
      font-size: 0.82rem;
      letter-spacing: 0.2em;
      text-transform: uppercase;
      color: rgba(212, 168, 75, 0.9);
      font-weight: 600;
      margin-bottom: 0.85rem;
    }
    .hero-brand-sub {
      margin-top: 0.85rem;
      margin-bottom: 1.6rem;
      font-size: 0.95rem;
      color: rgba(244, 247, 244, 0.55);
      max-width: 32em;
    }
    .hero-seo {
      margin: -0.35rem 0 1.35rem;
      font-size: 0.78rem;
      letter-spacing: 0.04em;
      color: rgba(244, 247, 244, 0.42);
      max-width: 40em;
      line-height: 1.55;
      animation: rise 1s var(--ease) 0.26s both;
    }

    .nav .brand {
      display: inline-flex;
      flex-direction: column;
      gap: 0.05rem;
      line-height: 1.15;
    }
    .nav .brand-en {
      font-family: "Instrument Serif", "Noto Serif SC", serif;
      font-size: 1.2rem;
      letter-spacing: 0.02em;
    }
    .nav .brand-zh {
      font-family: "Noto Serif SC", serif;
      font-size: 0.72rem;
      letter-spacing: 0.35em;
      color: var(--brass-bright);
      font-weight: 600;
    }

    /* —— Brand: Ark · 雅格 —— */
    #craft {
      background:
        radial-gradient(ellipse 70% 50% at 8% 0%, rgba(184, 137, 61, 0.14), transparent 55%),
        radial-gradient(ellipse 50% 40% at 100% 80%, rgba(26, 46, 54, 0.08), transparent 50%),
        linear-gradient(180deg, #dfe8e1 0%, var(--paper) 55%, #e4ece4 100%);
      position: relative;
      overflow: hidden;
    }
    #craft::before {
      content: "";
      position: absolute;
      inset: 0;
      background-image:
        linear-gradient(90deg, rgba(14, 26, 31, 0.03) 1px, transparent 1px),
        linear-gradient(rgba(14, 26, 31, 0.03) 1px, transparent 1px);
      background-size: 48px 48px;
      mask-image: linear-gradient(180deg, rgba(0,0,0,0.55), transparent 85%);
      pointer-events: none;
    }
    #craft .reveal { position: relative; z-index: 1; }
    .craft-head {
      display: grid;
      gap: 0.35rem;
      margin-bottom: 1.5rem;
    }
    .craft-title {
      font-family: "Instrument Serif", "Noto Serif SC", serif;
      font-size: clamp(2.4rem, 6vw, 4rem);
      line-height: 1;
      letter-spacing: -0.02em;
      max-width: none;
      margin-bottom: 0.2rem;
    }
    .craft-alias {
      font-family: "Noto Serif SC", serif;
      font-size: clamp(1.35rem, 2.8vw, 1.85rem);
      font-weight: 700;
      letter-spacing: 0.42em;
      color: var(--brass);
    }
    .craft-define {
      font-family: "Noto Serif SC", serif;
      font-size: clamp(1.2rem, 2.4vw, 1.55rem);
      font-weight: 600;
      line-height: 1.55;
      max-width: 22em;
      margin-bottom: 1rem;
    }
    .craft-origin-brief {
      color: var(--muted);
      font-size: 1.02rem;
      max-width: 40em;
      margin-bottom: 2.6rem;
    }
    .craft-pillars {
      list-style: none;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 1rem;
      margin-bottom: 2.8rem;
    }
    @media (min-width: 900px) {
      .craft-pillars { grid-template-columns: repeat(4, 1fr); gap: 1.15rem; }
    }
    .craft-pillars li {
      border: 1px solid rgba(14, 26, 31, 0.1);
      background: rgba(244, 247, 244, 0.72);
      padding: 1.35rem 1.15rem 1.4rem;
      min-height: 100%;
      transition: border-color 0.3s var(--ease), transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
    }
    .craft-pillars li:hover {
      border-color: rgba(184, 137, 61, 0.55);
      transform: translateY(-3px);
      box-shadow: 0 16px 40px rgba(14, 26, 31, 0.08);
    }
    .craft-pillars .zi {
      font-family: "Noto Serif SC", serif;
      font-size: clamp(2.4rem, 4vw, 3.1rem);
      font-weight: 700;
      line-height: 1;
      color: var(--ink);
      display: block;
      margin-bottom: 0.35rem;
    }
    .craft-pillars .nm {
      display: block;
      font-size: 0.72rem;
      letter-spacing: 0.18em;
      text-transform: uppercase;
      color: var(--brass);
      font-weight: 600;
      margin-bottom: 0.75rem;
    }
    .craft-pillars p {
      font-size: 0.9rem;
      color: var(--muted);
      line-height: 1.65;
    }
    .craft-story {
      display: grid;
      gap: 1.4rem;
      padding: 1.85rem 1.6rem;
      margin-bottom: 1.8rem;
      background:
        linear-gradient(135deg, rgba(14, 26, 31, 0.94), rgba(26, 46, 54, 0.92));
      color: var(--white);
      border-left: 4px solid var(--brass-bright);
      max-width: 52rem;
    }
    @media (min-width: 800px) {
      .craft-story {
        grid-template-columns: 7.5rem 1fr;
        padding: 2.1rem 2rem;
        align-items: start;
      }
    }
    .craft-story .mark {
      font-family: "Instrument Serif", serif;
      font-size: 0.78rem;
      letter-spacing: 0.16em;
      text-transform: uppercase;
      color: var(--brass-bright);
      line-height: 1.4;
    }
    .craft-story h3 {
      font-family: "Noto Serif SC", serif;
      font-size: clamp(1.25rem, 2.4vw, 1.55rem);
      font-weight: 700;
      margin-bottom: 0.75rem;
      line-height: 1.35;
    }
    .craft-story p {
      color: rgba(244, 247, 244, 0.78);
      font-size: 0.98rem;
      line-height: 1.75;
      margin-bottom: 0.85rem;
    }
    .craft-story p:last-child { margin-bottom: 0; }
    .craft-story .lessons {
      list-style: none;
      display: grid;
      gap: 0.55rem;
      margin-top: 0.35rem;
    }
    .craft-story .lessons li {
      display: grid;
      grid-template-columns: 1.1rem 1fr;
      gap: 0.55rem;
      font-size: 0.92rem;
      color: rgba(244, 247, 244, 0.82);
      line-height: 1.55;
    }
    .craft-story .lessons li::before {
      content: "";
      width: 0.45rem;
      height: 0.45rem;
      margin-top: 0.45rem;
      background: var(--brass-bright);
      border-radius: 50%;
    }
    .craft-fleet {
      font-family: "Noto Serif SC", serif;
      font-size: 1.08rem;
      font-weight: 600;
      line-height: 1.7;
      max-width: 40em;
      margin-bottom: 1.6rem;
      padding-top: 0.4rem;
      border-top: 1px solid rgba(14, 26, 31, 0.1);
    }
    .craft-origin {
      max-width: 44em;
      border-top: 1px dashed rgba(14, 26, 31, 0.18);
      padding-top: 1rem;
    }
    .craft-origin summary {
      cursor: pointer;
      font-size: 0.78rem;
      letter-spacing: 0.12em;
      text-transform: uppercase;
      color: var(--muted);
      font-weight: 500;
      list-style: none;
      display: inline-flex;
      align-items: center;
      gap: 0.4rem;
    }
    .craft-origin summary::-webkit-details-marker { display: none; }
    .craft-origin summary::before {
      content: "+";
      font-family: "Instrument Serif", serif;
      color: var(--brass);
      font-size: 1rem;
    }
    .craft-origin[open] summary::before { content: "–"; }
    .craft-origin .fine {
      margin-top: 0.75rem;
      font-size: 0.78rem;
      line-height: 1.7;
      color: var(--muted);
      opacity: 0.92;
    }

/* —— Multi-page chrome —— */
.site-main { padding-top: 4.5rem; min-height: 70vh; }
.page-hero {
  padding: 3.5rem 6vw 2.5rem;
  background:
    radial-gradient(ellipse 60% 80% at 10% 0%, rgba(184,137,61,0.16), transparent 55%),
    linear-gradient(180deg, #0e1a1f 0%, #1a2e36 100%);
  color: var(--white);
}
.page-hero h1 {
  font-family: "Noto Serif SC", "Instrument Serif", serif;
  font-size: clamp(1.85rem, 4vw, 2.75rem);
  font-weight: 700;
  line-height: 1.25;
  max-width: 18em;
  margin: 0.5rem 0 0.85rem;
}
.page-hero .define {
  font-size: 1.08rem;
  color: rgba(244,247,244,0.85);
  max-width: 40em;
  line-height: 1.7;
  margin-bottom: 0.75rem;
}
.page-hero .lead {
  color: rgba(244,247,244,0.62);
  max-width: 42em;
  font-size: 0.98rem;
}
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.5rem;
  font-size: 0.78rem;
  color: rgba(244,247,244,0.55);
  list-style: none;
  padding: 0;
  margin: 0 0 1rem;
}
.breadcrumb a { color: var(--brass-bright); opacity: 0.9; }
.breadcrumb a:hover { opacity: 1; }
.breadcrumb li:not(:last-child)::after {
  content: "/";
  margin-left: 0.5rem;
  color: rgba(244,247,244,0.35);
}
.breadcrumb--ink {
  color: var(--muted);
  padding: 1.25rem 6vw 0;
}
.breadcrumb--ink a { color: var(--brass); }
.breadcrumb--ink li:not(:last-child)::after { color: rgba(14,26,31,0.25); }
.prose-wrap { padding: 2.5rem 6vw 4rem; max-width: 52rem; }
.prose-wrap.wide { max-width: 68rem; }
.prose h2 {
  font-family: "Noto Serif SC", serif;
  font-size: clamp(1.35rem, 2.5vw, 1.75rem);
  margin: 2.2rem 0 0.85rem;
  scroll-margin-top: 5rem;
}
.prose h3 {
  font-family: "Noto Serif SC", serif;
  font-size: 1.12rem;
  margin: 1.6rem 0 0.55rem;
  scroll-margin-top: 5rem;
}
.prose p { color: var(--muted); margin-bottom: 1rem; line-height: 1.8; }
.prose ul, .prose ol { margin: 0 0 1.2rem 1.2rem; color: var(--muted); line-height: 1.75; }
.prose li { margin-bottom: 0.4rem; }
.prose a { color: var(--brass); font-weight: 500; }
.prose a:hover { color: var(--ink); }
.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.2rem 0 1.6rem;
  font-size: 0.92rem;
}
.prose th, .prose td {
  border: 1px solid rgba(14,26,31,0.12);
  padding: 0.7rem 0.85rem;
  text-align: left;
  vertical-align: top;
}
.prose th { background: rgba(184,137,61,0.1); color: var(--ink); font-weight: 600; }
.prose .byline {
  font-size: 0.85rem;
  color: var(--muted);
  border-left: 3px solid var(--brass);
  padding-left: 0.85rem;
  margin: 1.5rem 0;
}
.card-grid {
  list-style: none;
  display: grid;
  gap: 1rem;
  margin: 1.5rem 0 2rem;
  padding: 0;
}
@media (min-width: 800px) {
  .card-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1100px) {
  .card-grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
}
.card-grid a.card {
  display: block;
  height: 100%;
  padding: 1.25rem 1.2rem;
  border: 1px solid rgba(14,26,31,0.1);
  background: rgba(244,247,244,0.7);
  transition: border-color 0.25s, transform 0.25s;
}
.card-grid a.card:hover {
  border-color: rgba(184,137,61,0.55);
  transform: translateY(-2px);
}
.card-grid .meta {
  display: block;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--brass);
  margin-bottom: 0.45rem;
}
.card-grid h3 {
  font-family: "Noto Serif SC", serif;
  font-size: 1.05rem;
  margin: 0 0 0.45rem;
  color: var(--ink);
}
.card-grid p { font-size: 0.9rem; color: var(--muted); margin: 0; line-height: 1.6; }
.lang-switch a {
  font-size: 0.8rem;
  opacity: 0.75;
  padding: 0.2rem 0.4rem;
}
.lang-switch a.active { opacity: 1; color: var(--brass-bright); font-weight: 600; }
.nav .brand-en { font-size: 1.15rem; }
footer .foot-links { display: flex; flex-wrap: wrap; gap: 0.75rem 1.25rem; margin: 0.75rem 0 1rem; font-size: 0.88rem; }
footer .foot-links a { opacity: 0.75; }
footer .foot-links a:hover { opacity: 1; color: var(--brass-bright); }
.redirect-note { padding: 4rem 6vw; font-family: "Noto Sans SC", sans-serif; }