:root {
  --font-display: 'Unbounded', 'Arial Rounded MT Bold', sans-serif;
  --font-body: 'Rubik', -apple-system, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Consolas', monospace;

  --shop-bg: #F5F6F8;
  --shop-surface: #FFFFFF;
  --shop-surface-alt: #EFF1F4;
  --shop-border: #E2E4E9;
  --shop-text: #17181C;
  --shop-text-muted: #6B6F76;
  --shop-accent: #E4392E;
  --shop-accent-hover: #C92E24;
  --shop-accent-soft: #FDEBE9;
  --shop-success: #2FA84F;
  --shop-star: #F2A93B;
  --shop-backdrop: #47464C;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --radius-pill: 999px;
  --radius-btn: 10px;
  --radius-card: 16px;

  --shadow-sm: 0 1px 3px rgba(17,18,20,.08);
  --shadow-md: 0 6px 20px rgba(17,18,20,.10);
  --shadow-lg: 0 16px 40px rgba(17,18,20,.14);
  --shadow-card: 0 4px 20px rgba(20,20,28,.18);

  --space-1: 4px; --space-2: 8px; --space-3: 12px;
  --space-4: 16px; --space-5: 24px; --space-6: 32px; --space-7: 48px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--shop-bg);
  color: var(--shop-text);
  font-family: var(--font-body);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
h1, h2 { margin: 0; }
ul, dl { margin: 0; padding: 0; list-style: none; }
button { font-family: inherit; cursor: pointer; }
img { display: block; }
:focus-visible { outline: 2px solid var(--shop-accent); outline-offset: 2px; }
kbd {
  font-family: var(--font-mono);
  background: var(--shop-surface-alt);
  border: 1px solid var(--shop-border);
  border-radius: var(--radius-sm);
  padding: 1px 6px;
  font-size: .8rem;
}

.section-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.5rem;
  margin-bottom: var(--space-4);
}

/* header */
.shop-header {
  height: 64px;
  background: var(--shop-surface);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
}
.shop-header__inner {
  max-width: 1280px;
  margin: 0 auto;
  height: 100%;
  padding: 0 var(--space-5);
  display: flex;
  align-items: center;
  gap: var(--space-5);
}
.shop-logo {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  white-space: nowrap;
}
.shop-logo__mark {
  display: inline-flex;
  align-items: center;
  height: 30px;
  padding: 0 12px;
  border: 3px solid #e60012;
  border-radius: 999px;
  color: #e60012;
  font-family: 'Righteous', 'Arial Rounded MT Bold', 'Helvetica Neue', Arial, sans-serif;
  font-size: 1.15rem;
  letter-spacing: .01em;
  line-height: 1;
}
.shop-header__search { flex: 1; max-width: 480px; }
.shop-header__search input {
  width: 100%;
  height: 40px;
  border: 1px solid var(--shop-border);
  border-radius: var(--radius-pill);
  padding: 0 var(--space-4);
  background: var(--shop-surface-alt);
  font-size: .9rem;
  color: var(--shop-text);
}
.shop-header__actions { display: flex; align-items: center; gap: var(--space-2); margin-left: auto; }
.icon-btn {
  min-width: 40px; height: 40px;
  display: inline-flex; align-items: center; justify-content: center; gap: 1px;
  padding: 0 var(--space-2);
  border: none; background: transparent; border-radius: var(--radius-pill);
  color: var(--shop-text);
}
.icon-btn:hover { background: var(--shop-surface-alt); }

.icon-dot {
  font-weight: 700;
  line-height: 1;
  color: currentColor;
}

.bgm-btn {
  display: flex; align-items: center; gap: var(--space-2);
  height: 40px; padding: 0 var(--space-3);
  border: 1px solid var(--shop-border);
  border-radius: var(--radius-pill);
  background: var(--shop-surface-alt);
  color: var(--shop-text);
  font-size: .8rem; font-weight: 600;
}
.bgm-btn[aria-pressed="true"] { border-color: var(--shop-accent); color: var(--shop-accent); }
.bgm-btn__eq { display: flex; align-items: flex-end; gap: 2px; height: 12px; }
.bgm-btn__eq i { display: block; width: 2px; background: currentColor; height: 40%; border-radius: 1px; }

/* sticky purchase bar */
.sticky-buy {
  position: sticky;
  top: 64px;
  z-index: 90;
  background: var(--shop-surface);
  border-bottom: 1px solid var(--shop-border);
  box-shadow: var(--shadow-sm);
}
.sticky-buy[hidden] { display: none; }
.sticky-buy__inner {
  max-width: 1280px; margin: 0 auto;
  padding: var(--space-3) var(--space-5);
  display: flex; align-items: center; gap: var(--space-4);
}
.sticky-buy__title {
  font-family: var(--font-display); font-weight: 700; font-size: .95rem;
  color: var(--shop-text);
  flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.sticky-buy__price { font-size: .85rem; color: var(--shop-text-muted); white-space: nowrap; }
.btn-play--sticky { padding: 10px 22px; font-size: .9rem; white-space: nowrap; }

/* buttons */
.btn-play {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  padding: 14px 28px;
  background: var(--shop-accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-btn);
  transition: background .15s ease, transform .1s ease;
}
.btn-play:hover { background: var(--shop-accent-hover); }
.btn-play:active { transform: translateY(1px); }

.btn-secondary {
  font-family: var(--font-body);
  font-weight: 600;
  padding: 13px 24px;
  background: var(--shop-surface);
  border: 1px solid var(--shop-border);
  color: var(--shop-text);
  border-radius: var(--radius-btn);
}
.btn-secondary:hover { background: var(--shop-surface-alt); }
.btn-secondary--small { padding: 8px 16px; font-size: .85rem; }

.btn-ghost {
  font-weight: 600;
  padding: 10px 20px;
  background: transparent;
  border: 1px solid var(--shop-border);
  color: var(--shop-text);
  border-radius: var(--radius-btn);
}
.btn-ghost:hover { background: var(--shop-surface-alt); }
.btn-ghost--small { padding: 8px 16px; font-size: .85rem; }

main { max-width: 1280px; margin: 0 auto; padding: 0 var(--space-6); }

/* product: dark backdrop + floating white card (gallery + buy panel) */
.product { margin: 0 calc(-1 * var(--space-6)); }
.product__backdrop {
  background: var(--shop-backdrop);
  padding: 40px var(--space-6) 56px;
}
.product__card {
  max-width: 1200px;
  margin: 0 auto;
  background: var(--shop-surface);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: var(--space-6);
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(280px, 400px);
  gap: var(--space-6);
}

/* gallery (left column) */
.product__gallery { display: flex; flex-direction: column; min-width: 0; }
.gallery__main {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: #101018;
}
.gallery__canvas, .gallery__image {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
}
.gallery__canvas { z-index: 1; }
.gallery__image { z-index: 2; opacity: 0; pointer-events: none; transition: opacity .2s ease; }
.gallery__image.is-active { opacity: 1; pointer-events: auto; }
.gallery__caption {
  margin: var(--space-2) 0 0;
  font-size: .85rem;
  color: var(--shop-text-muted);
}
.gallery__caption[hidden] { display: none; }
.gallery__label {
  font-size: .72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--shop-text-muted);
  margin: var(--space-4) 0 var(--space-2);
}
.gallery__thumbs { display: flex; gap: var(--space-2); overflow-x: auto; padding-bottom: 2px; }
.gallery-thumb {
  flex: 0 0 auto;
  width: 86px; height: 62px;
  padding: 0;
  border: 2px solid transparent;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--shop-surface-alt);
  position: relative;
}
.gallery-thumb img { width: 100%; height: 100%; object-fit: cover; }
.gallery-thumb.is-active { border-color: var(--shop-accent); }
.gallery-thumb--live {
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, #1c1424, #33122c);
  color: #fff;
}
.gallery-thumb--live__dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--shop-accent);
  box-shadow: 0 0 0 0 rgba(228,57,46,.6);
  animation: gallery-live-pulse 1.6s ease-out infinite;
}
@keyframes gallery-live-pulse {
  0% { box-shadow: 0 0 0 0 rgba(228,57,46,.55); }
  70% { box-shadow: 0 0 0 8px rgba(228,57,46,0); }
  100% { box-shadow: 0 0 0 0 rgba(228,57,46,0); }
}
.gallery__rating {
  display: flex; align-items: center; gap: var(--space-3);
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--shop-border);
}

/* buy panel (right column) */
.product__buy { display: flex; flex-direction: column; min-width: 0; }
.badge--tag {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: .78rem;
  letter-spacing: .03em;
  text-transform: uppercase;
  color: var(--shop-accent);
  padding-left: var(--space-3);
  border-left: 3px solid var(--shop-accent);
  margin-bottom: var(--space-3);
}
.hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.5rem, 2.6vw, 2.1rem);
  color: var(--shop-text);
  line-height: 1.15;
  margin: 0 0 var(--space-3);
}
.hero__subtitle { font-size: .95rem; color: var(--shop-text-muted); margin: 0 0 var(--space-4); }
.hero__meta { display: flex; align-items: center; gap: var(--space-3); margin-bottom: var(--space-4); flex-wrap: wrap; }
.age-badge {
  min-width: 40px; height: 40px; padding: 0 12px;
  display: flex; align-items: center; justify-content: center;
  background: #111; color: #fff;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono); font-weight: 700;
  flex: 0 0 auto;
}
.stars { color: var(--shop-star); font-size: .92rem; }
.stars__value { color: var(--shop-text); font-weight: 700; margin-left: var(--space-1); }
.stars__count { color: var(--shop-text-muted); font-size: .82rem; }
.hero__price { font-size: 1.1rem; font-weight: 600; color: var(--shop-text); margin: 0 0 var(--space-4); }
.hero__price-old { text-decoration: line-through; color: var(--shop-text-muted); font-weight: 400; margin-right: var(--space-2); }
.hero__actions { display: flex; flex-direction: column; gap: var(--space-3); margin-top: auto; }
.hero__actions .btn-play, .hero__actions .btn-secondary { width: 100%; text-align: center; }

/* description + tags */
.screenshots, .description, .specs, .setlist { padding: var(--space-7) 0; }
.description { border-bottom: 1px solid var(--shop-border); display: grid; grid-template-columns: 1.4fr 1fr; gap: var(--space-6); }
.description .section-title { grid-column: 1 / -1; }
.description__text p { margin: 0; color: var(--shop-text); }
.feature-list { display: flex; flex-direction: column; gap: var(--space-3); }
.feature-list li {
  background: var(--shop-surface);
  border: 1px solid var(--shop-border);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  font-size: .92rem;
  box-shadow: var(--shadow-sm);
}
.feature-icon { display: inline-flex; align-items: baseline; margin-right: 2px; }

.tags-strip { padding: 0 0 var(--space-6); border-bottom: 1px solid var(--shop-border); }
.chip-list { display: flex; gap: var(--space-2); flex-wrap: wrap; }
.chip {
  font-size: .85rem; font-weight: 600;
  padding: var(--space-2) var(--space-4);
  background: var(--shop-surface-alt);
  border-radius: var(--radius-sm);
  color: var(--shop-text);
}

/* specs */
.specs { border-bottom: 1px solid var(--shop-border); }
.specs-row {
  display: flex; justify-content: space-between; align-items: flex-start;
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--shop-border);
  gap: var(--space-4);
}
.specs-row:last-child { border-bottom: none; }
.specs-row dt {
  display: flex; align-items: center; gap: var(--space-3);
  color: var(--shop-text); font-weight: 700; font-size: .95rem;
  min-width: 200px; flex: 0 0 auto;
}
.specs-row__icon { display: inline-flex; color: var(--shop-text-muted); flex: 0 0 auto; }
.specs-row dd { margin: 0; font-weight: 500; color: var(--shop-text-muted); text-align: right; flex: 1; }

/* setlist settings */
.setlist__settings {
  display: flex; gap: var(--space-6); flex-wrap: wrap;
  background: var(--shop-surface);
  border: 1px solid var(--shop-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  margin-bottom: var(--space-4);
}
.setting-block { display: flex; flex-direction: column; gap: var(--space-2); flex: 1; min-width: 220px; }
.setting-block__label { font-size: .85rem; color: var(--shop-text-muted); font-weight: 500; }
.difficulty-control { display: flex; gap: var(--space-1); background: var(--shop-surface-alt); border-radius: var(--radius-pill); padding: 4px; }
.difficulty-option {
  flex: 1;
  border: none; background: transparent;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  font-weight: 600; font-size: .85rem;
  color: var(--shop-text-muted);
}
.difficulty-option[aria-checked="true"] { background: var(--shop-accent); color: #fff; }

.calibration-slider {
  width: 100%;
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  border-radius: var(--radius-pill);
  background: var(--shop-border);
}
.calibration-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--shop-accent);
  cursor: pointer;
  border: 3px solid #fff;
  box-shadow: var(--shadow-sm);
}
.calibration-slider::-moz-range-thumb {
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--shop-accent);
  cursor: pointer;
  border: 3px solid #fff;
  box-shadow: var(--shadow-sm);
}

.controls-hint {
  display: flex; gap: var(--space-4); flex-wrap: wrap;
  font-size: .85rem; color: var(--shop-text-muted);
  margin-bottom: var(--space-5);
  padding: var(--space-3) var(--space-4);
  background: var(--shop-surface-alt);
  border-radius: var(--radius-md);
}
.controls-hint__keys { font-family: var(--font-mono); font-weight: 700; color: var(--shop-text); }
.controls-hint__or { font-family: var(--font-body); font-weight: 400; color: var(--shop-text-muted); margin: 0 var(--space-1); }

/* track rows */
.setlist-list { display: flex; flex-direction: column; gap: var(--space-3); }
.track-row {
  display: flex; align-items: center; gap: var(--space-4);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  background: var(--shop-surface-alt);
  border: 1px solid transparent;
}
.track-row--dragover { border-color: var(--shop-accent); background: var(--shop-accent-soft); }
.track-row__checkbox { width: 18px; height: 18px; accent-color: var(--shop-accent); flex: 0 0 auto; }
.track-row__num { font-family: var(--font-mono); color: var(--shop-text-muted); width: 28px; text-align: right; flex: 0 0 auto; }
.track-row__info { flex: 1; min-width: 0; }
.track-row__artist { font-weight: 700; font-size: .95rem; }
.track-row__title { font-size: .85rem; color: var(--shop-text-muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.track-row__status { font-size: .8rem; margin-top: 2px; }
.track-row__status--upload { color: var(--shop-success); }
.track-row__status--analyzing { color: var(--shop-star); }
.track-row__status--error { color: var(--shop-accent); }
.track-row__duration { font-family: var(--font-mono); color: var(--shop-text-muted); font-size: .85rem; flex: 0 0 auto; }
.track-row__drop {
  flex: 0 0 auto;
  border: 2px dashed var(--shop-border);
  border-radius: var(--radius-sm);
  padding: var(--space-2) var(--space-3);
  font-size: .78rem;
  color: var(--shop-text-muted);
  text-align: center;
  background: transparent;
  max-width: 160px;
}
.track-row__drop:hover { border-color: var(--shop-accent); color: var(--shop-accent); }
.track-row__actions { display: flex; gap: var(--space-2); flex: 0 0 auto; }
.track-row__play {
  width: 36px; height: 36px;
  border-radius: 50%;
  border: none;
  background: var(--shop-accent);
  color: #fff;
  font-size: .8rem;
  display: flex; align-items: center; justify-content: center;
}
.track-row__play:hover { background: var(--shop-accent-hover); }
.track-row__clear {
  width: 36px; height: 36px;
  border-radius: 50%;
  border: 1px solid var(--shop-border);
  background: var(--shop-surface);
  color: var(--shop-text-muted);
}
.track-row__clear:hover { color: var(--shop-accent); border-color: var(--shop-accent); }
.track-row__remove {
  width: 36px; height: 36px;
  border-radius: 50%;
  border: 1px solid var(--shop-border);
  background: var(--shop-surface);
  color: var(--shop-accent);
  font-weight: 700;
}
.track-row__remove:hover { background: var(--shop-accent-soft); border-color: var(--shop-accent); }

.setlist__add { margin-top: var(--space-4); }
.add-track-form { display: flex; gap: var(--space-2); margin-top: var(--space-3); flex-wrap: wrap; }
.add-track-input {
  flex: 1; min-width: 160px;
  height: 40px;
  border: 1px solid var(--shop-border);
  border-radius: var(--radius-sm);
  padding: 0 var(--space-3);
  background: var(--shop-surface);
  font-size: .9rem;
}
.setlist__hint { margin-top: var(--space-5); font-size: .82rem; color: var(--shop-text-muted); }
.setlist__hint code {
  font-family: var(--font-mono);
  background: var(--shop-surface-alt);
  border-radius: var(--radius-sm);
  padding: 1px 6px;
}

@media (max-width: 900px) {
  .product__card { grid-template-columns: 1fr; }
  .hero__actions { margin-top: var(--space-4); }
  .description { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  main { padding: 0 var(--space-4); }
  .product { margin: 0 calc(-1 * var(--space-4)); }
  .shop-header__inner { padding: 0 var(--space-4); gap: var(--space-3); }
  .shop-header__search { display: none; }
  .product__backdrop { padding: var(--space-4) var(--space-3) var(--space-6); }
  .product__card { padding: var(--space-4); border-radius: var(--radius-md); gap: var(--space-5); }
  .hero__title { font-size: 1.4rem; }
  .screenshots, .description, .specs, .setlist { padding: var(--space-6) 0; }
  .setlist__settings { flex-direction: column; }
  .track-row {
    display: grid;
    grid-template-columns: 22px 24px 1fr auto;
    grid-template-areas:
      "check num info duration"
      "drop drop actions actions";
    align-items: center;
    row-gap: var(--space-2);
    column-gap: var(--space-2);
  }
  .track-row__checkbox { grid-area: check; justify-self: center; }
  .track-row__num { grid-area: num; width: auto; text-align: left; }
  .track-row__info { grid-area: info; }
  .track-row__duration { grid-area: duration; justify-self: end; }
  .track-row__drop { grid-area: drop; max-width: none; width: 100%; }
  .track-row__actions { grid-area: actions; justify-self: end; }
  .specs-row { flex-direction: column; gap: var(--space-2); }
  .specs-row dd { text-align: left; }
  .sticky-buy__price { display: none; }
}

@media (max-width: 400px) {
  main { padding: 0 var(--space-3); }
  .product { margin: 0 calc(-1 * var(--space-3)); }
  .shop-logo { font-size: 1.05rem; }
  .product__card { padding: var(--space-3); }
  .gallery-thumb { width: 66px; height: 48px; }
  .specs-row { font-size: .85rem; }
  .track-row { padding: var(--space-2) var(--space-3); column-gap: var(--space-2); row-gap: var(--space-2); }
  .track-row__drop { font-size: .72rem; padding: var(--space-2); }
  .controls-hint { font-size: .78rem; }
  .sticky-buy__inner { padding: var(--space-2) var(--space-3); gap: var(--space-2); }
  .btn-play--sticky { padding: 8px 14px; font-size: .82rem; }
}

[hidden] { display: none !important; }