/* ── WORK OF ART — DESIGN SYSTEM ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --f: Helvetica Neue, Helvetica, Arial, sans-serif;
  --mono: 'Courier New', Courier, monospace;
  --black: #000; --white: #fff;
  --gray: #999; --soft: #f5f5f5; --border: #e8e8e8;
}
html { scroll-behavior: smooth; }
body { font-family: var(--f); color: var(--black); background: var(--white); font-size: 16px; -webkit-font-smoothing: antialiased; }

/* NAV */
nav { position: fixed; top: 0; left: 0; right: 0; z-index: 200; height: 52px; display: flex; align-items: center; padding: 0 2.5rem; background: rgba(255,255,255,.96); backdrop-filter: blur(12px); border-bottom: 1px solid var(--border); }
.nav-logo { font-size: .85rem; font-weight: 500; letter-spacing: -.01em; color: var(--black); text-decoration: none; margin-right: 3rem; flex-shrink: 0; }
nav ul { list-style: none; display: flex; gap: 2.5rem; flex: 1; }
nav ul a { font-size: .72rem; letter-spacing: -.01em; color: var(--black); text-decoration: none; opacity: .38; transition: opacity .15s; }
nav ul a:hover, nav ul a.active { opacity: 1; }

/* HOME */
.home { display: grid; grid-template-columns: 1fr 2fr; min-height: 100vh; }
.home-left { padding: 8.5rem 0 3rem 2.5rem; border-right: 1px solid var(--border); display: flex; flex-direction: column; justify-content: flex-end; }
.home-brand { font-size: clamp(3.5rem, 6vw, 5.5rem); font-weight: 400; letter-spacing: -.05em; line-height: .88; margin-bottom: 2rem; }
.home-desc { font-size: .73rem; color: var(--gray); line-height: 1.7; letter-spacing: -.01em; max-width: 220px; margin-bottom: 3rem; }
.home-links { list-style: none; }
.home-links li { border-top: 1px solid var(--border); }
.home-links li:last-child { border-bottom: 1px solid var(--border); }
.home-links a { display: flex; align-items: center; justify-content: space-between; padding: .9rem 0; font-size: .78rem; letter-spacing: -.02em; color: var(--black); text-decoration: none; transition: opacity .15s; }
.home-links a:hover { opacity: .4; }
.home-links .arr { font-size: .7rem; opacity: .4; }
.home-right { position: relative; }
#home-canvas { position: absolute; inset: 0; width: 100%; height: 100%; }

/* INNER PAGE — 4 COLUMNS */
.page {
  padding: 8.5rem 2rem 5rem;
  display: grid;
  grid-template-columns: 1fr 1fr 1.3fr 1fr;
  column-gap: 2rem;
  align-items: start;
  min-height: 100vh;
}

/* Col 1 — header */
.header-col { position: sticky; top: 7.5rem; }
.lbl { font-size: .58rem; letter-spacing: .1em; text-transform: uppercase; color: var(--gray); margin-bottom: 1.75rem; display: flex; align-items: center; gap: .5rem; }
.lbl::before { content: attr(data-n); color: var(--border); }
h1 { font-size: clamp(1.6rem, 2.5vw, 2.6rem); font-weight: 400; letter-spacing: -.04em; line-height: .95; }

/* Col 2 & 4 — animation canvases */
.anim-col { position: relative; min-height: calc(100vh - 9rem); }
.anim-canvas {
  position: sticky; top: 7.5rem;
  display: block; width: 100%; height: calc(100vh - 9rem);
  opacity: .3;
  transition: opacity .7s cubic-bezier(.4,0,.2,1);
}
.anim-canvas.dominant { opacity: .85; }
.anim-canvas.recessive { opacity: .04; }

/* Col 3 — expandable content */
.content-col { }

/* BLOCKS */
.block { border-top: 1px solid var(--border); padding: 1rem 0; }
.block:last-child { border-bottom: 1px solid var(--border); }
.block-row { display: flex; align-items: flex-start; justify-content: space-between; gap: .75rem; }
.block-left { flex: 1; min-width: 0; }
.block-num { font-size: .56rem; letter-spacing: .06em; text-transform: uppercase; color: var(--border); margin-bottom: .25rem; }
.block-title { font-size: .82rem; font-weight: 400; letter-spacing: -.02em; line-height: 1.3; }
.block-summary { font-size: .7rem; color: var(--gray); line-height: 1.6; margin-top: .35rem; letter-spacing: -.01em; }
.block-body { overflow: hidden; max-height: 0; transition: max-height .4s cubic-bezier(.4,0,.2,1), padding-top .4s ease; padding-top: 0; }
.block-body.open { max-height: 800px; padding-top: .75rem; }
.block-body p { font-size: .7rem; color: #555; line-height: 1.72; letter-spacing: -.01em; margin-bottom: .5rem; }
.block-body ul { padding-left: 1rem; margin-bottom: .5rem; }
.block-body li { font-size: .7rem; color: #555; line-height: 1.72; letter-spacing: -.01em; }
.block-body strong { color: var(--black); font-weight: 500; }
.block-price { font-size: .68rem; color: var(--gray); letter-spacing: -.01em; margin-top: .5rem; border-top: 1px solid var(--border); padding-top: .5rem; }
.btn-plus { width: 22px; height: 22px; border: 1px solid var(--border); background: none; cursor: pointer; color: var(--black); display: flex; align-items: center; justify-content: center; flex-shrink: 0; font-family: var(--f); font-size: .9rem; transition: background .15s; line-height: 1; padding: 0; }
.btn-plus:hover { background: var(--soft); }

/* FORMS */
.form-block { margin-bottom: 2.5rem; }
.form-block h2 { font-size: .9rem; font-weight: 400; letter-spacing: -.025em; margin-bottom: .35rem; }
.form-block > p { font-size: .7rem; color: var(--gray); line-height: 1.6; margin-bottom: 1.25rem; letter-spacing: -.01em; }
.form-row { margin-bottom: .8rem; }
.form-row label { display: block; font-size: .56rem; letter-spacing: .07em; text-transform: uppercase; color: var(--gray); margin-bottom: .28rem; }
input, textarea, select { width: 100%; background: transparent; border: none; border-bottom: 1px solid var(--border); color: var(--black); font-family: var(--f); font-size: .78rem; letter-spacing: -.01em; padding: .42rem 0; outline: none; transition: border-color .2s; -webkit-appearance: none; border-radius: 0; }
input:focus, textarea:focus, select:focus { border-color: var(--black); }
textarea { resize: none; min-height: 56px; line-height: 1.5; }
select { cursor: pointer; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath fill='%23999' d='M5 6L0 0h10z'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 0 center; }
select option { background: #fff; }
.form-submit { font-family: var(--f); font-size: .72rem; letter-spacing: -.01em; color: var(--white); background: var(--black); border: none; padding: .65rem 1.4rem; cursor: pointer; margin-top: .75rem; transition: opacity .2s; }
.form-submit:hover { opacity: .65; }
.form-ok { display: none; font-size: .68rem; color: var(--gray); margin-top: .6rem; letter-spacing: -.01em; }
.form-divider { border: none; border-top: 1px solid var(--border); margin: 2rem 0; }

/* FOOTER */
footer { padding: 1.2rem 2.5rem; border-top: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; }
.ft-logo { font-size: .75rem; font-weight: 500; letter-spacing: -.01em; }
.ft-info { font-size: .6rem; color: var(--gray); letter-spacing: -.01em; text-align: right; line-height: 1.55; }

/* RESPONSIVE */
@media (max-width: 1024px) {
  .page { grid-template-columns: 1fr 1fr 1fr; }
  .anim-col:last-child { display: none; }
}
@media (max-width: 768px) {
  .home { grid-template-columns: 1fr; }
  .home-right { min-height: 60vh; }
  .page { grid-template-columns: 1fr; padding: 7rem 1.5rem 4rem; }
  .header-col { position: relative; top: 0; margin-bottom: 1.5rem; }
  .anim-col { display: none; }
  nav { padding: 0 1.5rem; }
  nav ul { gap: 1.5rem; }
  footer { padding: 1rem 1.5rem; flex-direction: column; gap: .5rem; align-items: flex-start; }
  .ft-info { text-align: left; }
}
@media (max-width: 480px) { nav ul { display: none; } }