/* ═══════════════════════════════════════════════════════════
   RVBIO ART — shared styles
   Black #000000 · Red #CC0000 · Gold #D4AF37 · Silver #C0C0C0
   ═══════════════════════════════════════════════════════════ */

:root {
  --black:       #000000;
  --surface:     #0a0a0a;
  --red:         #CC0000;
  --red-glow:    rgba(204, 0, 0, 0.16);
  --gold:        #D4AF37;
  --gold-line:   rgba(212, 175, 55, 0.28);
  --silver:      #C0C0C0;
  --silver-dim:  rgba(192, 192, 192, 0.55);
  --silver-line: rgba(192, 192, 192, 0.14);
  --white:       #FFFFFF;

  --font-display: 'Anton', 'Arial Narrow', sans-serif;
  --font-body:    'Archivo', 'Helvetica Neue', sans-serif;

  --grad-metal: linear-gradient(180deg, #FFFFFF 0%, #C0C0C0 52%, #D4AF37 100%);
  --pad-x: clamp(24px, 6vw, 90px);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--black);
  color: var(--white);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; }
::selection { background: var(--gold); color: var(--black); }
a:focus-visible, button:focus-visible { outline: 2px solid var(--gold); outline-offset: 3px; }

/* ── Nav ── */
nav.art-nav {
  position: fixed; top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex; justify-content: space-between; align-items: center;
  gap: 16px;
  padding: 20px var(--pad-x);
  background: rgba(0, 0, 0, 0.3);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition: background 0.4s ease, border-color 0.4s ease;
}
nav.art-nav.scrolled {
  background: rgba(0, 0, 0, 0.72);
  border-bottom-color: var(--gold-line);
}
.nav-logo {
  font-family: var(--font-display);
  font-size: 1.15rem;
  letter-spacing: 0.12em;
  color: var(--white);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.25s;
}
.nav-logo:hover { color: var(--gold); }
.nav-links {
  display: flex; gap: clamp(16px, 2.5vw, 36px);
  list-style: none;
}
.nav-links a {
  color: var(--silver-dim);
  text-decoration: none;
  font-size: 0.66rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  position: relative;
  padding: 4px 0;
  transition: color 0.25s;
  white-space: nowrap;
}
.nav-links a::after {
  content: '';
  position: absolute; bottom: -2px; left: 0;
  width: 0; height: 1px;
  background: var(--gold);
  transition: width 0.35s var(--ease-out);
}
.nav-links a:hover, .nav-links a.nav-active { color: var(--white); }
.nav-links a:hover::after, .nav-links a.nav-active::after { width: 100%; }
.nav-links a.nav-back-music { color: var(--gold); }
.nav-links a.nav-back-music:hover { color: var(--white); }
.nav-links a.nav-music-link { color: var(--red); }
.nav-links a.nav-music-link::after { background: var(--red); }
.nav-links a.nav-music-link:hover { color: var(--white); }

@media (max-width: 820px) {
  nav.art-nav { padding: 16px 20px; }
  .nav-links { gap: 14px; overflow-x: auto; scrollbar-width: none; }
  .nav-links::-webkit-scrollbar { display: none; }
  .nav-links a { font-size: 0.6rem; }
}

/* ── Section labels ── */
.section-label {
  display: flex; align-items: center; gap: 14px;
  font-size: 0.64rem; font-weight: 600;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--gold);
}
.section-label::before {
  content: '';
  width: 38px; height: 1px;
  background: var(--gold);
}

/* ── Buttons ── */
.btn-inquire {
  width: 100%;
  padding: 17px 24px;
  background: transparent;
  border: 1px solid var(--gold);
  color: var(--gold);
  font-family: var(--font-body);
  font-size: 0.7rem; font-weight: 600;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.3s var(--ease-out), color 0.3s, box-shadow 0.3s, transform 0.15s;
}
.btn-inquire:hover {
  background: var(--gold);
  color: var(--black);
  box-shadow: 0 8px 40px rgba(212, 175, 55, 0.25);
}
.btn-inquire:active { transform: scale(0.98); }

.link-cta {
  display: inline-flex; align-items: center; gap: 12px;
  padding: 16px 32px;
  border: 1px solid var(--red);
  color: var(--white);
  text-decoration: none;
  font-size: 0.7rem; font-weight: 600;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  transition: background 0.3s var(--ease-out), box-shadow 0.3s, transform 0.15s;
}
.link-cta:hover {
  background: var(--red);
  box-shadow: 0 8px 40px rgba(204, 0, 0, 0.35);
}
.link-cta:active { transform: scale(0.98); }

/* ── Product card ── */
.product-card {
  position: relative;
  border: 1px solid var(--silver-line);
  padding: clamp(32px, 4vw, 52px);
  max-width: 460px;
  width: 100%;
  background: var(--surface);
  transition: border-color 0.4s;
  overflow: hidden;
}
.product-card:hover { border-color: var(--gold-line); }
.card-corner {
  position: absolute; top: 0; right: 0;
  width: 34px; height: 34px;
  border-top: 1px solid var(--gold);
  border-right: 1px solid var(--gold);
}
.card-section-label {
  font-size: 0.62rem; font-weight: 600;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 2rem;
}
.card-title {
  font-family: var(--font-display);
  font-size: 1.9rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--white);
  margin-bottom: 0.5rem;
  line-height: 1.1;
}
.card-edition {
  font-size: 0.7rem; font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--silver-dim);
  margin-bottom: 2.4rem;
}
.card-divider {
  width: 100%; height: 1px;
  background: var(--gold-line);
  margin-bottom: 2.4rem;
}
.card-meta {
  display: flex; justify-content: space-between; align-items: flex-end;
  gap: 16px;
  margin-bottom: 2.4rem;
}
.card-meta-item label {
  display: block;
  font-size: 0.6rem; font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--silver-dim);
  margin-bottom: 0.4rem;
}
.card-meta-item .value {
  font-size: 0.85rem; font-weight: 500;
  color: var(--white);
}
.card-price {
  font-family: var(--font-display);
  font-size: 2.6rem;
  letter-spacing: 0.01em;
  background: var(--grad-metal);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

/* ── Meta rows ── */
.meta-row {
  display: flex; justify-content: space-between; align-items: center;
  gap: 16px;
  padding: 1.2rem 0;
  border-bottom: 1px solid var(--silver-line);
}
.meta-row:first-child { border-top: 1px solid var(--silver-line); }
.meta-label {
  font-size: 0.66rem; font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--silver-dim);
}
.meta-value { font-size: 0.85rem; font-weight: 500; color: var(--white); }
.status-available {
  display: inline-flex; align-items: center; gap: 0.55rem;
  color: var(--gold); font-weight: 600;
}
.status-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--gold);
  animation: dot-pulse 2.2s ease-in-out infinite;
}

/* ── Footer ── */
footer.art-footer {
  padding: 28px var(--pad-x);
  display: flex; justify-content: space-between; align-items: center;
  gap: 12px; flex-wrap: wrap;
  border-top: 1px solid var(--gold-line);
}
footer.art-footer p {
  font-size: 0.62rem;
  letter-spacing: 0.2em;
  color: var(--silver-dim);
  text-transform: uppercase;
}

/* ── Reveal ── */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.85s var(--ease-out), transform 0.85s var(--ease-out);
}
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.32s; }
.reveal-delay-4 { transition-delay: 0.44s; }

/* ── Keyframes ── */
@keyframes fade-down {
  from { opacity: 0; transform: translateY(-14px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fade-up {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}
@keyframes scroll-pulse {
  0%, 100% { transform: scaleY(1); opacity: 0.5; }
  50%      { transform: scaleY(1.2); opacity: 1; }
}
@keyframes dot-pulse {
  0%, 100% { box-shadow: 0 0 4px rgba(212, 175, 55, 0.4); }
  50%      { box-shadow: 0 0 12px rgba(212, 175, 55, 0.8); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
}