@layer tokens, base, layout, components, responsive, print;

@layer tokens {
  :root {
    color-scheme: light;
    --ink: #181512;
    --ink-soft: #5f5851;
    --paper: #f4f0e8;
    --paper-strong: #fffdf8;
    --sand: #e9dfd1;
    --line: #d2c8bb;
    --line-dark: #9d9286;
    --copper: #b3522f;
    --copper-dark: #80371f;
    --lime: #d9ea91;
    --violet: #343048;
    --night: #1d1b24;
    --night-soft: #2b2834;
    --cream: #fff5e5;
    --blue: #285bd4;
    --green: #3c7656;
    --amber: #a66b20;
    --shadow: 0 22px 70px rgb(40 30 20 / .11);
    --shadow-small: 0 9px 28px rgb(40 30 20 / .09);
    --radius: 1.35rem;
    --radius-small: .76rem;
    --content: 82rem;
    --reading: 50rem;
  }
}

@layer base {
  * { box-sizing: border-box; }
  html { scroll-behavior: smooth; scroll-padding-top: 5.5rem; background: var(--paper); }
  body {
    margin: 0;
    color: var(--ink);
    background:
      radial-gradient(circle at 8% 0%, rgb(179 82 47 / .12), transparent 34rem),
      var(--paper);
    font-family: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Pretendard", "Noto Sans KR", "Segoe UI", sans-serif;
    font-size: clamp(.98rem, .2vw + .94rem, 1.07rem);
    line-height: 1.69;
    letter-spacing: -.008em;
    text-rendering: optimizeLegibility;
    overflow-wrap: anywhere;
  }
  h1, h2, h3, h4, p, ul, ol, dl { margin-top: 0; }
  h1, h2, h3, h4 { line-height: 1.14; letter-spacing: -.042em; }
  h2 { font-size: clamp(2.2rem, 5vw, 4.7rem); }
  h3 { font-size: clamp(1.18rem, 1.7vw, 1.58rem); }
  a { color: inherit; text-underline-offset: .18em; }
  a:hover { text-decoration-thickness: .14em; }
  img { display: block; max-width: 100%; }
  button, input, select { font: inherit; }
  button, select, input { min-height: 2.75rem; }
  button, a, input, select, summary { -webkit-tap-highlight-color: transparent; }
  :focus-visible { outline: 3px solid #4e85ff; outline-offset: 3px; }
  ::selection { color: #15120f; background: var(--lime); }
  code { padding: .1rem .35rem; border-radius: .3rem; background: rgb(0 0 0 / .08); font-size: .9em; }
}

@layer layout {
  .site-header { position: sticky; z-index: 50; top: 0; border-bottom: 1px solid rgb(30 20 16 / .13); background: rgb(244 240 232 / .9); backdrop-filter: blur(18px) saturate(140%); }
  .header-inner, .hero, .research-note, .section, .site-footer { width: min(100% - 2rem, var(--content)); margin-inline: auto; }
  .header-inner { display: flex; min-height: 4.8rem; align-items: center; gap: 1.4rem; }
  .primary-nav { display: flex; align-items: center; gap: clamp(.65rem, 1.6vw, 1.35rem); margin-left: auto; font-size: .82rem; font-weight: 760; white-space: nowrap; }
  .primary-nav a, .guide-switch { text-decoration: none; }
  .guide-switch { padding: .55rem .8rem; border: 1px solid var(--line-dark); border-radius: 999px; font-size: .75rem; font-weight: 800; }
  .hero { display: grid; min-height: min(55rem, calc(100svh - 4.8rem)); grid-template-columns: minmax(0, 1.16fr) minmax(21rem, .84fr); align-items: center; gap: clamp(2.5rem, 6vw, 7rem); padding-block: clamp(4rem, 9vw, 8rem); }
  .section { padding-block: clamp(5.5rem, 9vw, 9.5rem); content-visibility: auto; contain-intrinsic-size: auto 1100px; }
  .section-sand, .section-ink { width: 100%; max-width: none; padding-inline: max(1rem, calc((100% - var(--content)) / 2)); }
  .section-sand { border-block: 1px solid var(--line); background: var(--sand); }
  .section-ink { color: #faf6ef; background: radial-gradient(circle at 80% 5%, rgb(179 82 47 / .31), transparent 35rem), var(--night); }
  .section-heading { max-width: 59rem; margin-bottom: clamp(2.5rem, 5vw, 4.5rem); }
  .section-heading h2 { margin-bottom: 1.15rem; }
  .section-heading > p:last-child { color: var(--ink-soft); font-size: 1.07em; }
  .section-ink .section-heading > p:last-child { color: #cdc4bb; }
  .split-heading { display: grid; max-width: none; grid-template-columns: minmax(0, 1fr) auto; align-items: end; gap: 2rem; }
  .site-footer { display: flex; min-height: 13rem; align-items: center; justify-content: space-between; gap: 2rem; }
}

@layer components {
  .skip-link { position: fixed; z-index: 100; top: .75rem; left: .75rem; transform: translateY(-150%); padding: .7rem 1rem; border-radius: .5rem; color: white; background: var(--blue); }
  .skip-link:focus { transform: none; }
  .brand { display: inline-flex; align-items: center; gap: .65rem; font-size: .9rem; font-weight: 850; text-decoration: none; white-space: nowrap; }
  .brand-mark { display: grid; width: 2.2rem; height: 2.2rem; place-items: center; border-radius: 50%; color: var(--cream); background: var(--copper); font-family: Georgia, serif; font-size: 1.2rem; font-style: italic; }
  .eyebrow { margin-bottom: .9rem; color: var(--copper); font-size: .76rem; font-weight: 880; letter-spacing: .12em; text-transform: uppercase; }
  .section-ink .eyebrow { color: #f2aa85; }
  .hero h1 { max-width: 13ch; margin-bottom: 1.5rem; font-family: Georgia, "Times New Roman", serif; font-size: clamp(3.15rem, 7.2vw, 7rem); font-weight: 500; line-height: .98; }
  .hero h1 span { color: var(--copper); font-style: italic; }
  .hero-lead { max-width: 44rem; margin-bottom: 2rem; color: var(--ink-soft); font-size: clamp(1.05rem, 1.5vw, 1.35rem); }
  .hero-actions { display: flex; flex-wrap: wrap; gap: .75rem; margin-bottom: 3.1rem; }
  .button { display: inline-flex; min-height: 2.95rem; align-items: center; justify-content: center; padding: .72rem 1rem; border: 1px solid transparent; border-radius: .7rem; cursor: pointer; font-weight: 820; text-decoration: none; transition: transform .16s ease, background .16s ease; }
  .button:hover { transform: translateY(-2px); }
  .button-primary { color: white; background: var(--copper); }
  .button-primary:hover { background: var(--copper-dark); }
  .button-secondary { border-color: var(--line-dark); background: transparent; }
  .button-light { color: var(--night); background: var(--lime); }
  .button-quiet { border-color: var(--line-dark); background: transparent; }
  .hero-metrics { display: grid; max-width: 48rem; grid-template-columns: repeat(4, minmax(0, 1fr)); margin: 0; padding: 0; list-style: none; }
  .hero-metrics li { padding-right: .8rem; border-right: 1px solid var(--line); }
  .hero-metrics li + li { padding-left: .8rem; }
  .hero-metrics li:last-child { border: 0; }
  .hero-metrics strong, .hero-metrics span { display: block; }
  .hero-metrics strong { font-family: Georgia, serif; font-size: clamp(1.25rem, 2.4vw, 2rem); font-weight: 500; }
  .hero-metrics span { color: var(--ink-soft); font-size: .72rem; }

  .hero-stage { position: relative; min-height: 31rem; overflow: hidden; border: 1px solid #9e9488; border-radius: 50% 50% 1.5rem 1.5rem; background: radial-gradient(ellipse at 50% 85%, #f7c2a9, transparent 40%), var(--violet); box-shadow: var(--shadow); }
  .hero-stage p { position: absolute; right: 1.5rem; bottom: 1.2rem; left: 1.5rem; margin: 0; color: #ede8e2; text-align: center; font-size: .85rem; }
  .stage-speaker { position: absolute; z-index: 3; top: 18%; width: 4.8rem; height: 12rem; border: 1px solid #e0a17d; border-radius: .35rem; color: #f8d2bc; background: linear-gradient(90deg, #221e2b, #484153); box-shadow: .5rem .8rem 1.4rem rgb(0 0 0 / .28); text-align: center; }
  .stage-speaker span::before, .stage-speaker span::after { position: absolute; left: 50%; content: ""; transform: translateX(-50%); border: 1px solid #876c64; border-radius: 50%; background: #181620; box-shadow: inset 0 0 0 .55rem #2c2934; }
  .stage-speaker span::before { top: 1.3rem; width: 2rem; height: 2rem; }
  .stage-speaker span::after { bottom: 1.35rem; width: 3.7rem; height: 3.7rem; }
  .stage-speaker b { position: absolute; right: 0; bottom: -2rem; left: 0; }
  .stage-left { left: 13%; transform: perspective(500px) rotateY(13deg); }
  .stage-right { right: 13%; transform: perspective(500px) rotateY(-13deg); }
  .stage-listener { position: absolute; z-index: 4; top: 72%; left: 50%; display: grid; width: 3.5rem; height: 3.5rem; place-items: center; transform: translate(-50%, -50%); border: 1px solid #f7c2a9; border-radius: 50%; color: #f7c2a9; font-size: .62rem; font-weight: 900; }
  .stage-wave { position: absolute; z-index: 2; top: 10%; left: 50%; transform: translateX(-50%); border: 1px solid rgb(247 194 169 / .35); border-radius: 50%; }
  .wave-one { width: 14rem; height: 13rem; }
  .wave-two { top: 5%; width: 23rem; height: 20rem; }
  .wave-three { top: 0; width: 33rem; height: 28rem; }

  .research-note { display: grid; grid-template-columns: 1fr auto; gap: 3rem; padding: 1.6rem; border: 1px solid var(--line-dark); border-radius: var(--radius); background: rgb(255 253 248 / .7); box-shadow: var(--shadow-small); }
  .research-note h2 { margin-bottom: .45rem; font-size: 1rem; }
  .research-note p { margin: 0; color: var(--ink-soft); font-size: .86rem; }
  .research-note > p { min-width: 12rem; padding-left: 1.5rem; border-left: 1px solid var(--line); }

  .verdict-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
  .verdict-card { display: flex; min-height: 18rem; flex-direction: column; padding: clamp(1.4rem, 3vw, 2.4rem); border: 1px solid var(--line); border-radius: var(--radius); background: var(--paper-strong); box-shadow: var(--shadow-small); }
  .verdict-card.featured { color: white; background: var(--copper); }
  .card-kicker { margin-bottom: .55rem; font-size: .7rem; font-weight: 850; letter-spacing: .08em; text-transform: uppercase; }
  .verdict-card p:not(.card-kicker) { color: var(--ink-soft); }
  .verdict-card.featured p:not(.card-kicker) { color: #ffddd0; }
  .verdict-card dl { display: grid; grid-template-columns: 1fr 1fr; gap: .7rem; margin: auto 0 1rem; }
  .verdict-card dl div { padding-top: .8rem; border-top: 1px solid rgb(255 255 255 / .35); }
  .verdict-card dt, .verdict-card dd { margin: 0; }
  .verdict-card dt { font-size: .65rem; opacity: .75; }
  .verdict-card dd { font-size: .86rem; font-weight: 780; }
  .verdict-card > a { margin-top: auto; font-weight: 780; }

  .geneva-bridge { display: grid; grid-template-columns: 1.05fr .95fr; gap: clamp(2rem, 5vw, 5rem); margin-top: clamp(3rem, 7vw, 7rem); padding-top: clamp(3rem, 7vw, 6rem); border-top: 1px solid var(--line); }
  .geneva-copy h3 { font-family: Georgia, serif; font-size: clamp(2rem, 4vw, 3.6rem); font-weight: 500; }
  .callout { padding: 1rem 1.1rem; border-left: 4px solid var(--copper); background: var(--sand); }
  .small-note { color: var(--ink-soft); font-size: .78rem; }
  .text-link { font-weight: 800; }
  .before-after { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; align-self: center; }
  .before-after > div { position: relative; min-height: 23rem; padding: 1rem; overflow: hidden; border: 1px solid var(--line); border-radius: 10rem 10rem 1rem 1rem; background: var(--paper-strong); text-align: center; }
  .before-after b, .before-after small { position: relative; z-index: 3; display: block; }
  .before-after small { position: absolute; right: .6rem; bottom: 1rem; left: .6rem; color: var(--ink-soft); }
  .unit-one, .unit-left, .unit-right { position: absolute; z-index: 3; top: 31%; display: grid; width: 3rem; height: 6.4rem; place-items: center; border-radius: .3rem; color: white; background: var(--night); font-size: .7rem; }
  .unit-one { left: 50%; transform: translateX(-50%); }
  .unit-left { left: 10%; }.unit-right { right: 10%; }
  .narrow-stage, .wide-stage { position: absolute; z-index: 1; top: 25%; left: 50%; transform: translateX(-50%); border: 1px solid var(--copper); border-radius: 50%; }
  .narrow-stage { width: 8rem; height: 10rem; }.wide-stage { width: 16rem; height: 13rem; }

  .room-form { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
  .room-form label { display: flex; flex-direction: column; gap: .45rem; color: #cfc8c0; font-size: .75rem; font-weight: 760; }
  .room-form label span { display: flex; align-items: center; gap: .45rem; }
  .room-form input, .room-form select { width: 100%; padding: .65rem .75rem; border: 1px solid #5d5965; border-radius: .55rem; color: white; background: var(--night-soft); }
  .room-form button { align-self: end; }
  .advisor-result { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; margin-top: 1.5rem; padding: clamp(1.25rem, 3vw, 2rem); border: 1px solid #605b68; border-radius: var(--radius); background: rgb(255 255 255 / .05); }
  .advisor-result div { padding-right: 1rem; border-right: 1px solid #5e5963; }
  .advisor-result div:nth-child(3) { border: 0; }
  .advisor-result span, .advisor-result strong { display: block; }
  .advisor-result span { color: #aaa2ad; font-size: .7rem; }
  .advisor-result strong { color: var(--lime); font-family: Georgia, serif; font-size: clamp(1.4rem, 2.5vw, 2.1rem); font-weight: 500; }
  .advisor-result p { grid-column: 1 / -1; margin: .5rem 0 0; color: #d6d0d8; }

  .legend { display: flex; flex-wrap: wrap; gap: .85rem; color: var(--ink-soft); font-size: .72rem; }
  .legend span { display: inline-flex; align-items: center; gap: .35rem; }
  .dot { width: .6rem; height: .6rem; border-radius: 50%; background: var(--green); }
  .dot-room { background: var(--amber); }.dot-engineer { background: var(--copper); }
  .system-controls { display: flex; flex-wrap: wrap; gap: .5rem; margin-bottom: 1.5rem; }
  .chip { min-height: 2.5rem; padding: .45rem .82rem; border: 1px solid var(--line-dark); border-radius: 999px; cursor: pointer; background: transparent; font-size: .78rem; font-weight: 780; }
  .chip.is-active { color: white; border-color: var(--copper); background: var(--copper); }
  .systems-list { display: grid; gap: 1rem; }
  .system-card { display: grid; grid-template-columns: 10rem minmax(0, 1.1fr) minmax(17rem, .9fr); overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius); background: var(--paper-strong); box-shadow: var(--shadow-small); }
  .system-rank { display: flex; flex-direction: column; justify-content: space-between; padding: 1.35rem; color: white; background: var(--violet); }
  .system-rank strong { font-family: Georgia, serif; font-size: 2.4rem; font-weight: 500; }
  .system-rank span { font-size: .7rem; text-transform: uppercase; }
  .system-main, .system-bom { padding: clamp(1.3rem, 3vw, 2rem); }
  .system-main { border-right: 1px solid var(--line); }
  .system-meta { display: flex; flex-wrap: wrap; gap: .45rem; margin-bottom: .8rem; }
  .system-meta span { padding: .25rem .5rem; border-radius: 999px; color: var(--ink-soft); background: var(--sand); font-size: .67rem; font-weight: 750; }
  .system-main h3 { margin-bottom: .65rem; }
  .system-main p { color: var(--ink-soft); }
  .system-pluses { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-top: 1rem; }
  .system-pluses h4 { margin-bottom: .35rem; font-size: .75rem; letter-spacing: 0; }
  .system-pluses ul { margin: 0; padding-left: 1.1rem; color: var(--ink-soft); font-size: .78rem; }
  .system-bom h4 { display: flex; justify-content: space-between; margin-bottom: .7rem; font-size: .75rem; letter-spacing: 0; }
  .system-bom ol { margin: 0; padding: 0; list-style: none; }
  .system-bom li { display: grid; grid-template-columns: 1fr auto; gap: .6rem; padding-block: .5rem; border-bottom: 1px dashed var(--line); font-size: .76rem; }
  .system-bom li small { display: block; color: var(--ink-soft); }
  .system-total { display: flex; justify-content: space-between; margin-top: 1rem; font-weight: 850; }

  .catalog-search { display: grid; grid-template-columns: 2fr repeat(3, 1fr) auto auto; gap: .75rem; align-items: end; margin-bottom: 1.2rem; padding: 1rem; border: 1px solid var(--line-dark); border-radius: var(--radius); background: rgb(255 253 248 / .55); }
  .catalog-search label { display: flex; flex-direction: column; gap: .38rem; color: var(--ink-soft); font-size: .68rem; font-weight: 780; }
  .catalog-search input[type="search"], .catalog-search select { width: 100%; padding: .55rem .65rem; border: 1px solid var(--line-dark); border-radius: .52rem; background: var(--paper-strong); }
  .catalog-search .check-label { flex-direction: row; align-items: center; padding-bottom: .55rem; white-space: nowrap; }
  .result-count { color: var(--ink-soft); font-size: .8rem; }
  .product-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
  .product-card { display: flex; min-width: 0; flex-direction: column; overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius); background: var(--paper-strong); box-shadow: var(--shadow-small); }
  .product-image { position: relative; display: grid; aspect-ratio: 16 / 10; place-items: center; overflow: hidden; background: linear-gradient(145deg, #e7ded2, #f9f5ee); }
  .product-image img { width: 100%; height: 100%; object-fit: contain; mix-blend-mode: multiply; }
  .product-image .category-pill { position: absolute; top: .75rem; left: .75rem; padding: .25rem .48rem; border-radius: 999px; color: white; background: rgb(29 27 36 / .78); font-size: .62rem; font-weight: 800; backdrop-filter: blur(5px); }
  .product-body { display: flex; flex: 1; flex-direction: column; padding: 1.15rem; }
  .product-maker { margin-bottom: .15rem; color: var(--copper); font-size: .66rem; font-weight: 850; letter-spacing: .06em; text-transform: uppercase; }
  .product-body h3 { margin-bottom: .45rem; font-size: 1.2rem; }
  .product-price { display: flex; align-items: baseline; justify-content: space-between; gap: .5rem; margin-bottom: .7rem; }
  .product-price strong { font-family: Georgia, serif; font-size: 1.2rem; font-weight: 500; }
  .product-price small { color: var(--ink-soft); font-size: .6rem; text-align: right; }
  .product-summary { color: var(--ink-soft); font-size: .78rem; }
  .fit-line { display: grid; grid-template-columns: 1fr 1fr; gap: .5rem; margin-top: auto; padding-top: .7rem; border-top: 1px solid var(--line); font-size: .66rem; }
  .fit-line span { color: var(--ink-soft); }.fit-line b { display: block; color: var(--ink); }
  .product-details { margin-top: .75rem; border-top: 1px solid var(--line); }
  .product-details summary { padding-block: .65rem; cursor: pointer; font-size: .74rem; font-weight: 820; }
  .spec-list { margin: 0; }
  .spec-list div { padding-block: .58rem; border-top: 1px dashed var(--line); }
  .spec-list dt { font-size: .65rem; font-weight: 820; }
  .spec-list dd { margin: .1rem 0 0; color: var(--ink-soft); font-size: .68rem; }
  .product-procon { display: grid; grid-template-columns: 1fr 1fr; gap: .55rem; margin-top: .7rem; }
  .product-procon div { padding: .55rem; border-radius: .5rem; background: var(--sand); font-size: .65rem; }
  .product-procon b { display: block; margin-bottom: .15rem; }
  .product-links { display: flex; flex-wrap: wrap; gap: .4rem; margin-top: .8rem; }
  .product-links a { padding: .4rem .55rem; border: 1px solid var(--line-dark); border-radius: .4rem; font-size: .64rem; font-weight: 800; text-decoration: none; }
  .price-state { display: inline-flex; margin-top: .45rem; color: var(--amber); font-size: .61rem; font-weight: 780; }

  .brand-atlas { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1rem; }
  .brand-atlas article { min-height: 18rem; padding: 1.3rem; border: 1px solid var(--line); border-radius: var(--radius); background: var(--paper-strong); }
  .brand-atlas span { color: var(--copper); font-size: .65rem; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
  .brand-atlas h3 { margin: .45rem 0 .7rem; font-family: Georgia, serif; font-size: 1.9rem; font-weight: 500; }
  .brand-atlas p { color: var(--ink-soft); font-size: .77rem; }
  .brand-atlas a { font-size: .7rem; font-weight: 800; }

  .analogue-chain { display: grid; grid-template-columns: repeat(11, auto); align-items: center; gap: .55rem; margin-bottom: 2rem; padding: 1rem; overflow-x: auto; border: 1px solid #58535e; border-radius: var(--radius); background: rgb(255 255 255 / .04); }
  .analogue-chain div { min-width: 8.5rem; padding: .75rem; border-radius: .65rem; color: var(--night); background: var(--lime); }
  .analogue-chain span, .analogue-chain b, .analogue-chain small { display: block; }
  .analogue-chain span { font-size: .55rem; }.analogue-chain small { opacity: .7; }
  .parts-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .8rem; }
  .parts-grid details, .glossary-grid details { border: 1px solid #5b5661; border-radius: .8rem; background: rgb(255 255 255 / .045); }
  .parts-grid summary, .glossary-grid summary { padding: 1rem; cursor: pointer; font-weight: 800; }
  .parts-grid summary span { display: block; color: #a9a0aa; font-size: .66rem; font-weight: 600; }
  .parts-grid details p, .glossary-grid details p { margin: 0; padding: 0 1rem 1rem; color: #d5ced6; font-size: .78rem; }
  .setup-table-wrap { margin-top: 2rem; overflow-x: auto; }
  .setup-table { width: 100%; border-collapse: collapse; font-size: .75rem; }
  .setup-table caption { padding: 0 0 .8rem; font-weight: 850; text-align: left; }
  .setup-table th, .setup-table td { padding: .8rem; border-bottom: 1px solid #57525c; text-align: left; }
  .setup-table th { color: var(--lime); }

  .connection-tabs { display: flex; flex-wrap: wrap; gap: .5rem; margin-bottom: .8rem; }
  .connection-tabs button { padding: .5rem .75rem; border: 1px solid var(--line-dark); border-radius: 999px; cursor: pointer; background: transparent; font-size: .75rem; font-weight: 780; }
  .connection-tabs button[aria-selected="true"] { color: white; border-color: var(--copper); background: var(--copper); }
  .connection-panel { min-height: 15rem; padding: clamp(1rem, 3vw, 2rem); border: 1px solid var(--line); border-radius: var(--radius); background: var(--paper-strong); }
  .signal-flow { display: flex; align-items: stretch; gap: .55rem; overflow-x: auto; }
  .signal-node { min-width: 9rem; padding: .9rem; border: 1px solid var(--line); border-radius: .65rem; background: var(--sand); }
  .signal-node b, .signal-node small { display: block; }
  .signal-node small { color: var(--ink-soft); }
  .signal-arrow { display: flex; min-width: 5rem; align-items: center; justify-content: center; color: var(--copper); font-size: .7rem; text-align: center; }
  .connection-note { margin: 1rem 0 0; color: var(--ink-soft); font-size: .78rem; }
  .connection-rules, .cable-grid, .build-checklist, .apartment-grid, .method-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; margin-top: 1rem; }
  .connection-rules article, .cable-grid article, .build-checklist article, .apartment-grid article, .method-grid article { padding: 1.25rem; border: 1px solid var(--line); border-radius: var(--radius-small); background: var(--paper-strong); }
  .connection-rules article p, .cable-grid article p, .build-checklist article p, .apartment-grid article p, .method-grid article p { margin: 0; color: var(--ink-soft); font-size: .8rem; }
  .connection-rules h3, .cable-grid h3, .build-checklist h3, .apartment-grid h3, .method-grid h3 { font-size: 1rem; }
  .cable-budget { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; margin-bottom: 1.5rem; }
  .cable-budget div { padding: 1.2rem; border-top: 4px solid var(--copper); background: var(--paper-strong); }
  .cable-budget span, .cable-budget strong, .cable-budget small { display: block; }
  .cable-budget strong { font-family: Georgia, serif; font-size: 2rem; font-weight: 500; }
  .cable-budget small { color: var(--ink-soft); }

  .room-bands { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; margin-bottom: 2rem; }
  .room-bands article { padding: 1.5rem; border: 1px solid var(--line); border-radius: var(--radius); background: var(--paper-strong); }
  .room-bands span { color: var(--copper); font-size: .7rem; font-weight: 850; }.room-bands p { color: var(--ink-soft); font-size: .8rem; }.room-bands b { font-size: .72rem; }
  .room-plan { position: relative; width: min(100%, 56rem); aspect-ratio: 1.65; margin: 2rem auto; border: 2px solid var(--night); background: repeating-linear-gradient(90deg, transparent 0 4.95%, rgb(0 0 0 / .03) 5%); }
  .front-wall, .rear-treatment, .room-speaker, .room-seat, .first-reflection { position: absolute; display: grid; place-items: center; font-size: .7rem; text-align: center; }
  .front-wall { top: 0; right: 0; left: 0; height: 12%; color: white; background: var(--copper); }
  .rear-treatment { right: 0; bottom: 0; left: 0; height: 12%; background: var(--lime); }
  .room-speaker { top: 23%; width: 8%; height: 15%; color: white; background: var(--night); }.room-speaker-l { left: 22%; }.room-speaker-r { right: 22%; }
  .room-seat { bottom: 23%; left: 50%; width: 13%; height: 13%; transform: translateX(-50%); border-radius: 50%; color: white; background: var(--violet); }
  .first-reflection { top: 45%; width: 10%; height: 15%; color: white; background: var(--green); }.left-reflection { left: 0; }.right-reflection { right: 0; }
  .build-checklist article { background: var(--paper-strong); }
  .large-systems { display: grid; grid-template-columns: .45fr 1.55fr; gap: 2rem; margin-top: 4rem; padding: clamp(1.5rem, 4vw, 3rem); border-radius: var(--radius); color: white; background: var(--violet); }
  .large-systems > div h3 { font-family: Georgia, serif; font-size: 2.4rem; font-weight: 500; }
  .large-systems ol { margin: 0; padding: 0; counter-reset: tier; list-style: none; }
  .large-systems li { display: grid; grid-template-columns: 8rem 1fr; gap: .2rem 1rem; padding-block: 1rem; border-bottom: 1px solid #615b74; }
  .large-systems li span { grid-row: 1 / 3; color: #f2aa85; font-size: .75rem; font-weight: 850; }.large-systems li p { margin: 0; color: #cdc7d7; font-size: .76rem; }
  .section-ink .apartment-grid article { border-color: #57515d; background: rgb(255 255 255 / .05); }
  .section-ink .apartment-grid h3 { color: var(--lime); }.section-ink .apartment-grid p { color: #d3ccd5; }.section-ink .apartment-grid a { font-size: .72rem; font-weight: 800; }

  .glossary-grid { columns: 2; column-gap: 1rem; }
  .glossary-grid details { margin-bottom: 1rem; break-inside: avoid; border-color: var(--line); background: var(--paper-strong); }
  .glossary-grid details p { color: var(--ink-soft); }
  .purchase-check { margin-top: 1.5rem; padding: 1.5rem; border: 1px solid var(--line-dark); border-radius: var(--radius); background: var(--paper-strong); }
  .purchase-check ol { columns: 2; margin: 0; padding-left: 1.3rem; }.purchase-check li { padding: .25rem; break-inside: avoid; }
  .source-index { margin-top: 1.5rem; padding-top: 1.5rem; border-top: 1px solid var(--line-dark); }
  .source-index ul { display: grid; grid-template-columns: repeat(2, 1fr); gap: .4rem 1rem; padding-left: 1.2rem; font-size: .75rem; }
  .image-credit { margin-top: 1.5rem; color: var(--ink-soft); font-size: .7rem; }
  .site-footer p { margin: .25rem 0 0; color: var(--ink-soft); font-size: .75rem; }
  .site-footer > div:last-child { display: flex; flex-wrap: wrap; align-items: center; gap: 1rem; }
  .site-footer button { min-height: auto; padding: .5rem .75rem; border: 1px solid var(--line-dark); border-radius: .5rem; cursor: pointer; background: transparent; }
}

@layer responsive {
  @media (max-width: 1120px) {
    .primary-nav a:nth-last-child(-n + 2) { display: none; }
    .product-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .catalog-search { grid-template-columns: repeat(3, 1fr); }.search-wide { grid-column: span 2; }
    .brand-atlas { grid-template-columns: repeat(3, 1fr); }
    .system-card { grid-template-columns: 8rem 1fr; }.system-bom { grid-column: 2; border-top: 1px solid var(--line); }.system-main { border-right: 0; }
  }
  @media (max-width: 880px) {
    html { scroll-padding-top: 4.6rem; }
    .header-inner { min-height: 4.2rem; }.primary-nav { display: none; }.guide-switch { margin-left: auto; }
    .hero { min-height: 0; grid-template-columns: 1fr; padding-top: 4rem; }.hero-stage { min-height: 28rem; }
    .geneva-bridge { grid-template-columns: 1fr; }
    .room-form { grid-template-columns: repeat(2, 1fr); }
    .advisor-result { grid-template-columns: 1fr 1fr; }.advisor-result div:nth-child(2) { border: 0; }.advisor-result div:nth-child(3) { grid-column: 1 / -1; border-top: 1px solid #5e5963; padding-top: .7rem; }
    .brand-atlas { grid-template-columns: repeat(2, 1fr); }
    .room-bands { grid-template-columns: 1fr; }
    .large-systems { grid-template-columns: 1fr; }
  }
  @media (max-width: 680px) {
    .header-inner, .hero, .research-note, .section, .site-footer { width: min(100% - 1.15rem, var(--content)); }
    .section-sand, .section-ink { width: 100%; padding-inline: .575rem; }
    .brand span:last-child { display: none; }
    .hero h1 { font-size: clamp(3rem, 15vw, 4.6rem); }
    .hero-metrics { grid-template-columns: 1fr 1fr; gap: 1rem 0; }.hero-metrics li:nth-child(2) { border-right: 0; }.hero-metrics li:nth-child(3) { padding-left: 0; }
    .research-note { grid-template-columns: 1fr; gap: 1rem; }.research-note > p { padding: 1rem 0 0; border-top: 1px solid var(--line); border-left: 0; }
    .verdict-grid, .parts-grid, .connection-rules, .cable-grid, .build-checklist, .apartment-grid, .method-grid { grid-template-columns: 1fr; }
    .before-after { grid-template-columns: 1fr; }.before-after > div { min-height: 20rem; }
    .room-form, .advisor-result { grid-template-columns: 1fr; }.advisor-result div, .advisor-result div:nth-child(2), .advisor-result div:nth-child(3) { grid-column: auto; padding: 0 0 .7rem; border: 0; border-bottom: 1px solid #5e5963; }
    .split-heading { grid-template-columns: 1fr; }
    .system-card { grid-template-columns: 1fr; }.system-rank { min-height: 6rem; flex-direction: row; }.system-bom { grid-column: 1; }.system-pluses { grid-template-columns: 1fr; }
    .catalog-search { grid-template-columns: 1fr 1fr; }.search-wide { grid-column: 1 / -1; }
    .product-grid, .brand-atlas { grid-template-columns: 1fr; }
    .brand-atlas article { min-height: auto; }
    .cable-budget { grid-template-columns: 1fr; }
    .room-plan { aspect-ratio: .8; }.room-speaker { top: 20%; width: 13%; }.room-speaker-l { left: 18%; }.room-speaker-r { right: 18%; }.first-reflection { top: 43%; width: 17%; }
    .large-systems li { grid-template-columns: 1fr; }.large-systems li span { grid-row: auto; }
    .glossary-grid { columns: 1; }.purchase-check ol { columns: 1; }.source-index ul { grid-template-columns: 1fr; }
    .site-footer { align-items: flex-start; flex-direction: column; justify-content: center; }
  }
  @media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; }.button { transition: none; } }
}

@layer print {
  @media print {
    @page { margin: 14mm; }
    body { background: white; font-size: 9pt; }
    .site-header, .hero-actions, .system-controls, .catalog-search, .connection-tabs, .site-footer button { display: none !important; }
    .hero { min-height: 0; grid-template-columns: 1fr; padding-block: 1rem; }.hero-stage { display: none; }
    .section, .section-sand, .section-ink { width: 100%; padding: 1rem 0; color: black; background: white; content-visibility: visible; }
    .product-grid { grid-template-columns: repeat(2, 1fr); }.product-card, .system-card, article, details { break-inside: avoid; box-shadow: none !important; }
    .product-details { display: block; }.product-image { max-height: 110px; }
    a { text-decoration: none; }.section-ink .section-heading > p:last-child, .parts-grid details p { color: #444; }
  }
}