:root {
  color-scheme: light;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic", sans-serif;
  color: #1b2430;
  background: #f7f8fa;
  font-synthesis: none;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; min-width: 320px; }
a { color: inherit; }

.skip-link { position: absolute; left: 1rem; top: -5rem; z-index: 5; padding: .75rem 1rem; background: #fff; border-radius: .5rem; }
.skip-link:focus { top: 1rem; }
.site-header { background: rgba(255,255,255,.78); border-bottom: 1px solid #e8ecf0; }
.site-header-inner { max-width: 1200px; margin: auto; min-height: 76px; padding: 0 32px; display: flex; align-items: center; gap: 12px; }
.brand-mark { width: 38px; height: 38px; display: grid; place-items: center; border-radius: 11px; background: #244a69; color: white; font-size: 17px; font-weight: 800; }
.brand-text { display: flex; flex-direction: column; line-height: 1.25; }
.brand-eyebrow { color: #596a78; font-size: 11px; font-weight: 700; letter-spacing: .07em; }
.brand-name { margin-top: 2px; font-size: 17px; font-weight: 800; letter-spacing: -.02em; }

.page-shell { max-width: 1200px; margin: auto; padding: 70px 32px 100px; }
.intro { margin-bottom: 34px; }
.eyebrow { margin: 0 0 14px; color: #42718e; font-size: 12px; font-weight: 800; letter-spacing: .16em; }
h1 { margin: 0; font-size: clamp(30px, 4vw, 46px); font-weight: 800; letter-spacing: -.045em; line-height: 1.25; }
.intro-copy { margin: 14px 0 0; color: #61707d; font-size: 15px; line-height: 1.7; }

.category-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.category-card { position: relative; display: flex; flex-direction: column; min-height: 350px; padding: 23px; overflow: hidden; border: 1px solid #e4e9ee; border-radius: 22px; background: #fff; box-shadow: 0 8px 26px rgba(28,52,73,.04); text-decoration: none; transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease; }
.category-card:hover { transform: translateY(-4px); border-color: #cbd7df; box-shadow: 0 16px 34px rgba(28,52,73,.1); }
.category-card:focus-visible { outline: 3px solid #216b9b; outline-offset: 3px; }
.card-top { display: flex; justify-content: space-between; align-items: center; color: #5f7180; font-size: 12px; font-weight: 800; letter-spacing: .1em; }
.card-arrow { width: 28px; height: 28px; display: grid; place-items: center; border: 1px solid #e7ebee; border-radius: 50%; color: #566b7a; font-size: 17px; line-height: 1; letter-spacing: 0; }
.card-art { align-self: center; width: 116px; height: 116px; margin: 17px 0 20px; display: grid; place-items: center; border-radius: 28px; color: var(--art-color); background: var(--art-bg); }
.card-art svg { width: 76px; height: 76px; }
.card-label { font-size: 24px; font-weight: 800; letter-spacing: -.035em; }
.card-description { margin-top: 8px; min-height: 43px; color: #5c6b76; font-size: 13px; line-height: 1.55; }
.card-action { display: flex; justify-content: space-between; gap: 10px; margin-top: auto; padding-top: 18px; border-top: 1px solid #edf0f2; color: #244a69; font-size: 13px; font-weight: 800; }
.card-action span { font-size: 18px; line-height: .8; }
.refrigerator { --art-color: #3c7799; --art-bg: #eaf5f8; }
.air-conditioner { --art-color: #408882; --art-bg: #e9f5f1; }
.tv { --art-color: #736aa3; --art-bg: #f0edfa; }
.washing-machine { --art-color: #ae7b53; --art-bg: #fbf1e8; }

@media (max-width: 1000px) {
  .category-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .category-card { min-height: 310px; }
}
@media (max-width: 600px) {
  .site-header-inner { min-height: 64px; padding: 0 20px; }
  .page-shell { padding: 48px 20px 72px; }
  .intro { margin-bottom: 26px; }
  .category-grid { gap: 12px; }
  .category-card { min-height: 255px; padding: 15px; border-radius: 18px; }
  .card-art { width: 76px; height: 76px; margin: 14px 0 12px; border-radius: 20px; }
  .card-art svg { width: 54px; height: 54px; }
  .card-label { font-size: 19px; }
  .card-description { font-size: 11px; min-height: 47px; }
  .card-action { font-size: 11px; padding-top: 12px; }
}
@media (max-width: 380px) {
  .page-shell { padding-left: 14px; padding-right: 14px; }
  .category-grid { gap: 9px; }
  .category-card { padding: 12px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .category-card { transition: none; }
}