:root {
  --bg: #f6f3ee;
  --ink: #171512;
  --muted: #6c665e;
  --panel: #ffffff;
  --accent: #27736b;
  --accent-dark: #17453f;
  --line: rgba(23, 21, 18, 0.13);
  --filter-nav-expanded-max-height: 50dvh;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: Arial, "Noto Sans KR", sans-serif;
}

a {
  color: inherit;
  text-decoration: none;
}

/* Shared header */

.site-header {
  background: var(--panel);
  border-bottom: 1px solid var(--line);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 78px;
  padding: 18px 24px;
}

.logo {
  font-size: clamp(2rem, 4vw, 4.2rem);
  font-weight: 900;
  line-height: 1;
  letter-spacing: 0;
}

.hero {
  position: relative;
  display: flex;
  align-items: flex-end;
  min-height: clamp(360px, 62vh, 620px);
  margin: 0 auto 18px;
  padding: clamp(28px, 5vw, 72px);
  overflow: hidden;
  background:
    linear-gradient(180deg, rgba(15, 14, 12, 0.1), rgba(15, 14, 12, 0.78)),
    url("assets/hero-guitars.png") center / cover no-repeat;
}

.hero::after {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 28%;
  content: "";
  background: linear-gradient(180deg, transparent, rgba(0, 0, 0, 0.25));
  pointer-events: none;
}

.hero-copy {
  position: relative;
  z-index: 1;
  max-width: 760px;
  color: #fffaf2;
}

.hero-copy p,
.section-heading p,
.category-content span {
  margin: 0 0 10px;
  color: #91d6cd;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero-copy h1 {
  max-width: 12em;
  margin: 0;
  font-size: clamp(2rem, 6vw, 5.4rem);
  line-height: 1.02;
  letter-spacing: 0;
}

.category-nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: center;
  gap: 10px;
  padding: 14px 16px;
  background: rgba(246, 243, 238, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.category-nav a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 92px;
  min-height: 42px;
  padding: 10px 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fffdf8;
  color: var(--accent-dark);
  font-weight: 800;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.category-nav a:hover,
.category-nav a:focus-visible {
  border-color: rgba(39, 115, 107, 0.42);
  background: #e8f2ef;
  transform: translateY(-1px);
}

main {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.category-list {
  padding: clamp(44px, 7vw, 84px) 0;
}

.section-heading {
  margin-bottom: 22px;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(1.8rem, 3vw, 3rem);
  letter-spacing: 0;
}

.category-card {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 260px;
  margin-bottom: 22px;
  overflow: hidden;
  border: 1px solid rgba(255, 250, 242, 0.12);
  border-radius: 8px;
  background-position: center;
  background-size: cover;
  box-shadow: 0 20px 45px rgba(21, 19, 15, 0.16);
  isolation: isolate;
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.category-card::before {
  position: absolute;
  inset: 0;
  z-index: -1;
  content: "";
  background:
    linear-gradient(90deg, rgba(8, 9, 8, 0.83), rgba(8, 9, 8, 0.48) 45%, rgba(8, 9, 8, 0.08)),
    linear-gradient(180deg, rgba(0, 0, 0, 0.08), rgba(0, 0, 0, 0.35));
}

.category-card:hover,
.category-card:focus-visible {
  border-color: rgba(145, 214, 205, 0.86);
  box-shadow:
    0 0 0 4px rgba(145, 214, 205, 0.24),
    0 30px 72px rgba(21, 19, 15, 0.35),
    0 12px 28px rgba(39, 115, 107, 0.28);
  transform: translateY(-5px) scale(1.01);
}

.acoustic,
.acoustic-page {
  background-image: url("assets/category-acoustic.png");
}

.electric,
.electric-page {
  background-image: url("assets/category-electric.png");
}

.bass,
.bass-page {
  background-image: url("assets/category-bass.png");
}

.category-content {
  width: min(520px, 92%);
  padding: clamp(24px, 5vw, 54px);
  color: #fffaf2;
}

.category-content h3 {
  margin: 0 0 10px;
  font-size: clamp(2.2rem, 5vw, 4.6rem);
  line-height: 1;
  letter-spacing: 0;
}

.category-content p {
  max-width: 32rem;
  margin: 0;
  color: rgba(255, 250, 242, 0.82);
  font-size: clamp(1rem, 1.8vw, 1.2rem);
  line-height: 1.65;
}

.instrument-hero {
  position: relative;
  display: grid;
  min-height: clamp(320px, 54vh, 520px);
  place-items: center;
  overflow: hidden;
  background-position: center;
  background-size: cover;
  isolation: isolate;
}

.instrument-hero::before {
  position: absolute;
  inset: 0;
  z-index: -1;
  content: "";
  background:
    radial-gradient(circle at center, rgba(145, 214, 205, 0.18), transparent 34%),
    linear-gradient(180deg, rgba(8, 9, 8, 0.18), rgba(8, 9, 8, 0.82));
}

.instrument-hero h1 {
  margin: 0;
  color: #fffaf2;
  font-size: clamp(3.2rem, 10vw, 8.4rem);
  line-height: 1;
  text-align: center;
  text-shadow: 0 18px 50px rgba(0, 0, 0, 0.55);
}

/* Product filters */

.filter-nav {
  position: sticky;
  top: 0;
  z-index: 12;
  padding: 16px;
  background: rgba(246, 243, 238, 0.3);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.filter-scroll {
  display: flex;
  flex-flow: row nowrap;
  align-items: flex-start;
  justify-content: safe center;
  gap: 12px;
  padding: 5px 0px 3px 0;
}

.filter-scroll,
.brand-options {
  overflow-x: auto;
  overscroll-behavior-inline: contain;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.filter-scroll::-webkit-scrollbar,
.brand-options::-webkit-scrollbar {
  display: none;
}

.filter-scroll > * {
  flex: 0 0 auto;
}

.filter-nav[data-filter-expand-all] .filter-apply-row {
  display: none;
}

.filter-nav[data-filter-expand-all].is-filter-open .filter-apply-row {
  display: flex;
  justify-content: center;
  margin-top: 12px;
}

.filter-nav[data-filter-expand-all].is-filter-open {
  max-height: var(--filter-nav-expanded-max-height);
  overflow-y: auto;
}

.filter-pill {
  display: inline-flex;
  justify-items: center;
  flex-direction: column;
}

.filter-pill summary,
.filter-apply,
.filter-reset {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 18px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fffdf8;
  color: var(--accent-dark);
  font: inherit;
  font-weight: 800;
  cursor: pointer;
  list-style: none;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease, box-shadow 180ms ease;
}

.filter-pill summary::-webkit-details-marker {
  display: none;
}

.filter-pill[open] summary,
.filter-pill summary:hover,
.filter-apply:hover,
.filter-apply:focus-visible,
.filter-reset:hover,
.filter-reset:focus-visible {
  border-color: rgba(39, 115, 107, 0.42);
  background: #e8f2ef;
  box-shadow: 0 8px 24px rgba(39, 115, 107, 0.14);
  transform: translateY(-1px);
}

.filter-panel {
  width: min(340px, calc(100vw - 32px));
  margin-top: 10px;
  padding: 18px;
  border: 1px solid rgba(39, 115, 107, 0.2);
  border-radius: 8px;
  background: #fffdf8;
  box-shadow: 0 22px 54px rgba(21, 19, 15, 0.2);
}

.filter-panel.brand-filter {
  width: min(550px, calc(100vw - 32px));
  max-height: 30vh;
}

.brand-filter {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  overflow-y:auto;
}




.brand-section h3 {
  margin: 0 0 8px;
  color: var(--accent-dark);
  font-size: 0.95rem;
}

.brand-options {
  align-items: center;
  gap: 18px;
}

.brand-filter label,
.price-filter label {
  color: var(--ink);
  font-size: 0.95rem;
  font-weight: 800;
}

.brand-filter label {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 8px;
  min-height: 38px;
  white-space: nowrap;
}

.brand-filter input,
.price-filter input {
  accent-color: var(--accent);
}

.price-filter {
  display: grid;
  gap: 12px;
}

.price-filter input {
  width: 100%;
}

.price-field {
  display: grid;
  grid-template-columns: 1fr minmax(120px, 150px);
  gap: 12px;
  align-items: center;
}

.price-field input[type="range"] {
  min-width: 0;
}

.price-field input[type="number"] {
  width: 100%;
  min-height: 38px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fffaf2;
  color: var(--ink);
  font: inherit;
  font-weight: 800;
}

.price-max-group.is-disabled {
  display: none;
}

.price-limit-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 36px;
}

.price-limit-toggle input {
  width: auto;
}

.filter-apply,
.filter-reset {
  color: #fffaf2;
  background: var(--accent-dark);
}

.filter-apply:hover,
.filter-apply:focus-visible {
  color: #fffaf2;
  background: var(--accent-dark);
}

/* Product list */

.instrument-list {
  padding: clamp(44px, 7vw, 84px) 0;
}

.instrument-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(24px, 4vw, 42px);
}

.instrument-item {
  display: grid;
  align-content: start;
  gap: 18px;
  min-height: 340px;
  padding: clamp(18px, 4vw, 34px);
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fffdf8;
  color: inherit;
  cursor: pointer;
  box-shadow: 0 18px 44px rgba(21, 19, 15, 0.08);
  transition: transform 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
}

.instrument-item:hover,
.instrument-item:focus-visible {
  border-color: rgba(145, 214, 205, 0.86);
  box-shadow:
    0 0 0 4px rgba(145, 214, 205, 0.2),
    0 26px 58px rgba(21, 19, 15, 0.2),
    0 10px 24px rgba(39, 115, 107, 0.18);
  outline: none;
  transform: translateY(-5px);
}

.instrument-image-placeholder {
  min-height: 180px;
  border: 1px dashed rgba(23, 21, 18, 0.22);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(39, 115, 107, 0.08), rgba(255, 250, 242, 0.78)),
    #f0ebe2;
}

.instrument-item h3 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(1.35rem, 2.2vw, 2rem);
  line-height: 1.15;
  letter-spacing: 0;
}

.instrument-price {
  margin: -6px 0 0;
  color: var(--accent-dark);
  font-size: 1.1rem;
  font-weight: 900;
}

.instrument-item[hidden],
.empty-state[hidden] {
  display: none;
}

.empty-state {
  grid-column: 1 / -1;
  margin: 36px 0 0;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fffdf8;
  color: var(--muted);
  text-align: center;
  font-weight: 800;
}

.product-load-sentinel {
  width: 100%;
  height: 1px;
}

.product-load-sentinel[hidden] {
  display: none;
}

.product-load-status {
  margin: 32px 0 0;
  color: var(--muted);
  text-align: center;
  font-weight: 800;
}

.product-load-status.is-error {
  color: #9b342e;
}

/* Product price comparison */

.comparison-topbar {
  display: grid;
  grid-template-columns: minmax(88px, 1fr) auto minmax(88px, 1fr);
}

.comparison-back-button {
  display: inline-flex;
  grid-column: 1;
  align-items: center;
  justify-self: start;
  min-height: 42px;
  padding: 9px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--accent-dark);
  background: #fffdf8;
  font-weight: 800;
  transition: border-color 180ms ease, background 180ms ease, transform 180ms ease;
}

.comparison-topbar .logo {
  grid-column: 2;
}

.comparison-back-button:hover,
.comparison-back-button:focus-visible {
  border-color: rgba(39, 115, 107, 0.42);
  background: #e8f2ef;
  outline: none;
  transform: translateX(-2px);
}

.comparison-hero {
  display: grid;
  min-height: clamp(260px, 38vh, 420px);
  padding: clamp(20px, 4vw, 48px);
  place-items: center;
  background:
    radial-gradient(circle at center, rgba(145, 214, 205, 0.16), transparent 48%),
    #fffdf8;
}

.comparison-product-image {
  display: block;
  width: min(520px, 86vw);
  height: clamp(220px, 34vh, 360px);
  object-fit: contain;
}

.comparison-image-placeholder {
  display: grid;
  width: min(520px, 86vw);
  min-height: clamp(220px, 34vh, 360px);
  padding: 24px;
  place-items: center;
  border: 1px dashed rgba(23, 21, 18, 0.22);
  border-radius: 8px;
  color: var(--muted);
  background: #f0ebe2;
  text-align: center;
  font-weight: 800;
}

.comparison-product-image[hidden],
.comparison-image-placeholder[hidden] {
  display: none;
}

.comparison-main {
  padding: clamp(24px, 4vw, 46px) 0 clamp(48px, 7vw, 82px);
}

.comparison-status {
  min-height: 120px;
  padding-top: 38px;
}

.product-summary,
.store-comparison {
  width: min(800px, 100%);
  margin-inline: auto;
}

.product-summary {
  padding: clamp(28px, 4vw, 48px);
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fffdf8;
  box-shadow: 0 18px 44px rgba(21, 19, 15, 0.08);
}

.product-brand {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 900;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.product-summary h1 {
  margin: 0;
  font-size: clamp(2rem, 5vw, 4rem);
  line-height: 1.08;
}

.store-comparison {
  padding-top: clamp(32px, 5vw, 56px);
}

.store-heading span {
  display: block;
  margin-top: 10px;
  color: var(--muted);
  line-height: 1.6;
}

.store-list {
  display: grid;
  width: min(720px, 100%);
  margin: 0 auto;
  padding: 0;
  gap: 12px;
  list-style: none;
}

.store-list[hidden] {
  display: none;
}

.store-offer {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  min-height: 76px;
  padding: 18px 22px;
  gap: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fffdf8;
  box-shadow: 0 12px 30px rgba(21, 19, 15, 0.06);
  transition: transform 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
}

.store-offer:hover,
.store-offer:focus-visible {
  border-color: rgba(145, 214, 205, 0.86);
  box-shadow:
    0 0 0 4px rgba(145, 214, 205, 0.2),
    0 18px 42px rgba(21, 19, 15, 0.14);
  outline: none;
  transform: translateY(-2px);
}

.store-info {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.store-name {
  overflow-wrap: anywhere;
  font-size: 1.05rem;
  font-weight: 900;
}

.lowest-price-badge {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 4px 9px;
  border-radius: 999px;
  color: #fffaf2;
  background: var(--accent-dark);
  font-size: 0.72rem;
  font-weight: 900;
}

.store-price {
  color: var(--accent-dark);
  font-size: clamp(1.05rem, 2.2vw, 1.35rem);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.site-footer {
  padding: 34px 18px 42px;
  color: rgba(255, 250, 242, 0.76);
  background: #171512;
  text-align: center;
}

.site-footer p {
  margin: 0 0 8px;
}

.site-footer small {
  color: rgba(255, 250, 242, 0.54);
}

.scroll-to-top {
  position: fixed;
  right: clamp(16px, 3vw, 36px);
  bottom: clamp(16px, 3vw, 36px);
  z-index: 20;
  display: grid;
  width: 52px;
  height: 52px;
  padding: 0;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 50%;
  color: #fff;
  background: var(--accent-dark);
  box-shadow: 0 12px 30px rgba(21, 19, 15, 0.28);
  font: inherit;
  font-size: 1.45rem;
  font-weight: 900;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 180ms ease, transform 180ms ease, visibility 180ms ease, background-color 180ms ease;
}

.scroll-to-top:hover {
  background: var(--accent);
  transform: translateY(-2px);
}

.scroll-to-top img {
  display: block;
  width: 26px;
  height: 26px;
  object-fit: contain;
}

.scroll-to-top:focus-visible {
  outline: 3px solid rgba(145, 214, 205, 0.7);
  outline-offset: 3px;
}

.scroll-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* Responsive layout */

@media (max-width: 920px) {
  .instrument-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .topbar {
    min-height: 66px;
  }

  .hero {
    min-height: 430px;
    padding: 26px 20px;
  }

  .category-nav {
    justify-content: flex-start;
    overflow-x: auto;
  }

  .category-nav a {
    flex: 0 0 auto;
  }

  main {
    width: min(100% - 24px, 1120px);
  }

  .category-card {
    min-height: 320px;
    background-position: 62% center;
  }

  .category-card::before {
    background:
      linear-gradient(180deg, rgba(8, 9, 8, 0.2), rgba(8, 9, 8, 0.86)),
      linear-gradient(90deg, rgba(8, 9, 8, 0.62), rgba(8, 9, 8, 0.16));
  }

  .category-content {
    align-self: flex-end;
    padding: 28px 22px;
  }

  .instrument-hero {
    min-height: 380px;
  }

  .filter-nav {
    padding-inline: 12px;
  }

  .filter-scroll {
    justify-content: flex-start;
  }

  .price-field {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 620px) {
  .instrument-grid {
    grid-template-columns: 1fr;
  }

  .comparison-hero {
    min-height: 300px;
  }

  .comparison-topbar {
    grid-template-columns: minmax(72px, 1fr) auto minmax(72px, 1fr);
    padding-inline: 12px;
  }

  .comparison-back-button {
    min-height: 38px;
    padding: 8px 10px;
    font-size: 0.85rem;
  }

  .product-summary {
    padding: 28px 20px;
  }

  .store-offer {
    grid-template-columns: 1fr;
    gap: 9px;
  }

  .scroll-to-top {
    width: 46px;
    height: 46px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .scroll-to-top {
    transition: none;
  }
}