:root {
  --paper: #ece9e1;
  --paper-2: #f8f6f0;
  --ink: #171714;
  --muted: #66645d;
  --line: rgba(23, 23, 20, .18);
  --lime: #d7ff45;
  --blue: #164ee8;
  --rust: #be4f31;
  --radius: 28px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Pretendard", "Noto Sans KR", sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
.skip-link { position: fixed; z-index: 100; top: -100px; left: 16px; padding: 10px 16px; background: #fff; color: #000; }
.skip-link:focus { top: 16px; }

.site-header {
  position: absolute;
  z-index: 5;
  top: 0;
  left: 50%;
  width: min(1320px, calc(100% - 48px));
  height: 86px;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: #fff;
  border-bottom: 1px solid rgba(255, 255, 255, .2);
}
.brand { display: flex; align-items: center; gap: 12px; letter-spacing: -.02em; }
.brand span { display: grid; place-items: center; width: 34px; height: 34px; border: 1px solid rgba(255, 255, 255, .45); border-radius: 50%; font: 700 1rem/1 Georgia, serif; }
.site-header nav, footer nav { display: flex; gap: 24px; }
.site-header nav a { font-size: .82rem; font-weight: 750; color: rgba(255, 255, 255, .76); }
.site-header nav a:hover { color: #fff; }

.hero {
  min-height: 790px;
  padding: 150px max(24px, calc((100vw - 1320px) / 2)) 90px;
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(390px, .88fr);
  align-items: center;
  gap: 70px;
  overflow: hidden;
  color: #fff;
  background: #11110f;
}
.eyebrow { margin: 0 0 16px; font-size: .72rem; font-weight: 900; letter-spacing: .16em; text-transform: uppercase; }
.hero h1 { margin: 0; font: 500 clamp(3.6rem, 6.7vw, 7rem)/.92 Georgia, "Times New Roman", serif; letter-spacing: -.065em; }
.hero h1 em { color: var(--lime); font-weight: 500; }
.hero-copy > p:not(.eyebrow) { max-width: 760px; margin: 34px 0 0; color: rgba(255, 255, 255, .7); font-size: clamp(1rem, 1.5vw, 1.23rem); }
.hero-copy strong { color: #fff; }
.hero-actions { display: flex; gap: 10px; margin-top: 34px; }
.button { display: inline-flex; align-items: center; min-height: 48px; padding: 0 21px; border: 1px solid rgba(255,255,255,.25); border-radius: 999px; font-size: .86rem; font-weight: 850; }
.button.light { color: #111; background: var(--lime); border-color: var(--lime); }
.button.ghost:hover { background: rgba(255,255,255,.08); }

.hero-art { position: relative; min-height: 500px; }
.disc { position: absolute; z-index: 2; top: 50%; left: 50%; width: min(31vw, 410px); aspect-ratio: 1; transform: translate(-50%, -50%); border: 1px solid rgba(255,255,255,.5); border-radius: 50%; background: radial-gradient(circle at center, #111 0 4%, var(--lime) 4.2% 11%, #1c1c19 11.5% 100%); box-shadow: 0 45px 90px rgba(0,0,0,.4); }
.disc::after { content: ""; position: absolute; inset: 7%; border-radius: inherit; background: repeating-radial-gradient(circle, transparent 0 5px, rgba(255,255,255,.08) 5.5px 6px); }
.disc i { position: absolute; z-index: 2; width: 9px; height: 9px; border-radius: 50%; background: #fff; opacity: .65; }
.disc i:nth-child(1) { left: 19%; top: 30%; }
.disc i:nth-child(2) { right: 22%; top: 22%; }
.disc i:nth-child(3) { right: 20%; bottom: 26%; }
.disc span { position: absolute; z-index: 3; left: 50%; top: 50%; transform: translate(-50%, -50%); color: #111; font-size: .72rem; font-weight: 900; }
.wave { position: absolute; left: 50%; top: 50%; aspect-ratio: 1; border: 1px solid rgba(215,255,69,.33); border-radius: 50%; transform: translate(-50%, -50%); }
.wave-a { width: min(39vw, 520px); }
.wave-b { width: min(49vw, 650px); }
.wave-c { width: min(60vw, 790px); }
.hero-art p { position: absolute; z-index: 3; left: 50%; bottom: 2px; transform: translateX(-50%); display: flex; gap: 18px; align-items: center; font-size: .65rem; letter-spacing: .2em; }
.hero-art p b { color: var(--lime); }

.snapshot { width: min(1180px, calc(100% - 48px)); min-height: 108px; margin: -54px auto 0; padding: 22px 28px; position: relative; z-index: 4; display: grid; grid-template-columns: repeat(4, 1fr) auto; gap: 20px; align-items: center; background: var(--lime); border-radius: 18px; box-shadow: 0 14px 45px rgba(25,25,20,.15); }
.snapshot p { margin: 0; display: grid; }
.snapshot b { font: 600 1.45rem/1 Georgia, serif; }
.snapshot span, .snapshot small { font-size: .67rem; font-weight: 800; letter-spacing: .05em; }
.snapshot small { max-width: 120px; color: rgba(0,0,0,.65); }

.reports, .method { width: min(1180px, calc(100% - 48px)); margin: 0 auto; padding: 130px 0; }
.section-heading { max-width: 760px; margin-bottom: 48px; }
.section-heading h2 { margin: 0; font: 500 clamp(2.4rem, 5vw, 4.6rem)/1 Georgia, serif; letter-spacing: -.05em; }
.section-heading > p:last-child { margin: 20px 0 0; color: var(--muted); }

.report-card { position: relative; margin-top: 28px; padding: 52px; display: grid; grid-template-columns: 80px minmax(0, 1fr) 245px; gap: 32px; border-radius: var(--radius); overflow: hidden; }
.guitar-card { color: #fff; background: var(--blue); }
.hifi-card { background: #d8d1c2; }
.card-index { font: 500 3.2rem/1 Georgia, serif; opacity: .45; }
.card-copy h3 { margin: 0; font: 500 clamp(2rem, 4vw, 3.5rem)/1 Georgia, serif; letter-spacing: -.045em; }
.card-copy > p:not(.eyebrow) { max-width: 660px; margin: 22px 0; opacity: .8; }
.card-copy ul { margin: 0; padding: 0; list-style: none; display: grid; grid-template-columns: 1fr 1fr; gap: 7px 22px; font-size: .78rem; font-weight: 750; }
.card-copy li::before { content: "— "; opacity: .6; }
.card-link { width: min(100%, 330px); min-height: 56px; margin-top: 30px; padding: 0 20px; display: flex; justify-content: space-between; align-items: center; border: 1px solid currentColor; border-radius: 999px; font-weight: 900; }
.card-link b { font-size: 1.2rem; }
.guitar-card .card-link { color: #111; border-color: var(--lime); background: var(--lime); }
.hifi-card .card-link { color: #fff; border-color: #111; background: #111; }
.report-card dl { margin: 4px 0 0; align-self: stretch; border-left: 1px solid currentColor; opacity: .85; }
.report-card dl div { padding: 0 0 22px 24px; }
.report-card dt { font-size: .63rem; font-weight: 900; letter-spacing: .12em; text-transform: uppercase; opacity: .65; }
.report-card dd { margin: 4px 0 0; font: 500 1.2rem/1.25 Georgia, serif; }

.method { padding-top: 20px; }
.method-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius); background: var(--line); }
.method-grid article { min-height: 240px; padding: 34px; background: var(--paper-2); }
.method-grid span { display: inline-grid; place-items: center; width: 30px; height: 30px; border-radius: 50%; color: #fff; background: var(--rust); font-size: .65rem; font-weight: 900; }
.method-grid h3 { margin: 28px 0 8px; font: 600 1.45rem/1.2 Georgia, serif; }
.method-grid p { margin: 0; color: var(--muted); font-size: .9rem; }
.method-note { margin: 24px 0 0; color: var(--muted); font-size: .75rem; }

footer { min-height: 170px; padding: 44px max(24px, calc((100vw - 1180px) / 2)); display: flex; align-items: center; justify-content: space-between; color: rgba(255,255,255,.8); background: #11110f; }
footer b { color: #fff; font-family: Georgia, serif; font-size: 1.15rem; }
footer p { margin: 4px 0 0; font-size: .75rem; }
footer a { font-size: .75rem; font-weight: 800; }

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; min-height: auto; padding-top: 130px; }
  .hero-art { min-height: 400px; }
  .disc { width: min(70vw, 360px); }
  .wave-a { width: min(84vw, 470px); }
  .wave-b { width: min(105vw, 590px); }
  .wave-c { width: min(125vw, 700px); }
  .snapshot { grid-template-columns: 1fr 1fr; }
  .snapshot small { max-width: none; grid-column: 1 / -1; }
  .report-card { grid-template-columns: 54px 1fr; }
  .report-card dl { grid-column: 2; display: grid; grid-template-columns: repeat(3, 1fr); border-left: 0; border-top: 1px solid currentColor; padding-top: 20px; }
  .report-card dl div { padding-left: 0; }
}

@media (max-width: 620px) {
  .site-header { width: calc(100% - 32px); }
  .site-header nav { display: none; }
  .hero { padding-left: 20px; padding-right: 20px; gap: 26px; }
  .hero h1 { font-size: clamp(3rem, 16vw, 4.6rem); }
  .hero-art { min-height: 320px; }
  .snapshot, .reports, .method { width: calc(100% - 32px); }
  .snapshot { padding: 20px; }
  .reports { padding-top: 100px; }
  .report-card { padding: 30px 24px; grid-template-columns: 1fr; }
  .card-index { font-size: 2rem; }
  .card-copy ul { grid-template-columns: 1fr; }
  .report-card dl { grid-column: 1; grid-template-columns: 1fr; }
  .method-grid { grid-template-columns: 1fr; }
  footer { align-items: flex-start; gap: 28px; flex-direction: column; }
  footer nav { flex-wrap: wrap; }
}

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

@media print {
  .site-header, .hero-art, .hero-actions { display: none; }
  .hero { min-height: auto; padding: 40px; color: #000; background: #fff; }
  .hero h1 em { color: #000; }
  .snapshot { margin: 0 auto; box-shadow: none; }
  .reports, .method { padding: 50px 0; }
  .report-card { break-inside: avoid; }
}