/* ══════════════════════════════════════════════════════════════════════════
   KANGAN JEWELLERS — navbar.css
   Shared site header (logo, Silver/Gold collection buttons, nav, CTA).
   Used by the homepage and the Silver / Gold collection pages.
   Expects --bg, --text, --serif, --sans on :root (all pages define them).
══════════════════════════════════════════════════════════════════════════ */

/* ─── Header ─────────────────────────────────────────────────────────── */
#header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem 3rem;
  transition: background 0.5s ease, padding 0.4s ease, box-shadow 0.5s ease;
}

#header.scrolled {
  background: var(--bg);
  padding: 1rem 3rem;
  box-shadow: 0 1px 0 rgba(184, 154, 94, 0.22);
}

/* ── Logo: text shown over video, image shown when scrolled ── */
.header-logo-link {
  display: block;
  position: relative;
  flex-shrink: 0;
  height: 44px;
  display: flex;
  align-items: center;
}

/* Image logo: hidden by default (over video), shown when scrolled */
.header-logo-img {
  height: 44px;
  width: auto;
  max-width: 160px;
  object-fit: contain;
  opacity: 0;
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  transition: opacity 0.45s ease;
  /* multiply blend makes the white background disappear over ivory */
  mix-blend-mode: multiply;
  pointer-events: none;
}

/* Text logo: white, shown over video */
.header-logo-text {
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 400;
  letter-spacing: 0.1em;
  color: #fff;
  white-space: nowrap;
  transition: opacity 0.45s ease;
}

/* Cross-fade: scrolled state shows image, hides text */
#header.scrolled .header-logo-img {
  opacity: 1;
  pointer-events: auto;
}

#header.scrolled .header-logo-text {
  opacity: 0;
}

/* Nav */
#header-nav {
  display: flex;
  gap: 2.75rem;
}

#header-nav a {
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.92);
  transition: color 0.3s ease;
  position: relative;
}

#header-nav a::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--accent, #B89A5E);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.28s ease;
}

#header-nav a:hover::after {
  transform: scaleX(1);
}

#header.scrolled #header-nav a {
  color: rgba(14, 14, 14, 0.65);
}

/* CTA button */
.header-cta {
  display: inline-block;
  padding: 0.75rem 2rem;
  border: 1px solid rgba(255, 255, 255, 0.55);
  color: #fff;
  font-family: var(--sans);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.45s ease;
  flex-shrink: 0;
}

#header.scrolled .header-cta {
  border-color: var(--accent, #B89A5E);
  color: var(--text);
}

.header-cta:hover {
  background: var(--text);
  border-color: var(--text);
  color: var(--bg);
}

/* ─── Silver Collection Button ──────────────────────────────────────── */
.silver-collection-btn {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
  text-decoration: none;
  position: relative;
  padding: 0.6rem 1.4rem;
  border-radius: 2px;
  background: linear-gradient(
    135deg,
    #3a3a3a 0%,
    #6e6e6e 18%,
    #c8c8c8 35%,
    #f0f0f0 50%,
    #c0c0c0 65%,
    #8a8a8a 80%,
    #4a4a4a 100%
  );
  background-size: 200% 200%;
  box-shadow:
    0 0 0 1px rgba(255,255,255,0.18),
    inset 0 1px 0 rgba(255,255,255,0.45),
    inset 0 -1px 0 rgba(0,0,0,0.25),
    0 2px 12px rgba(0,0,0,0.35),
    0 1px 3px rgba(0,0,0,0.2);
  transition: background-position 0.5s ease, box-shadow 0.3s ease, transform 0.2s ease;
  animation: silverShimmer 4s ease-in-out infinite;
}

@keyframes silverShimmer {
  0%   { background-position: 0% 50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.silver-collection-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 2px;
  background: linear-gradient(
    180deg,
    rgba(255,255,255,0.3) 0%,
    rgba(255,255,255,0.0) 55%,
    rgba(0,0,0,0.12) 100%
  );
  pointer-events: none;
}

.silver-btn-inner {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  position: relative;
  z-index: 1;
}

.silver-btn-icon {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
  filter: drop-shadow(0 1px 1px rgba(0,0,0,0.4));
}

.silver-btn-label {
  font-family: var(--serif);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #1a1a1a;
  text-shadow: 0 1px 0 rgba(255,255,255,0.6), 0 -1px 0 rgba(0,0,0,0.2);
  white-space: nowrap;
}

.silver-btn-label--short {
  display: none;
}

.silver-collection-btn:hover {
  background-position: 100% 0%;
  box-shadow:
    0 0 0 1px rgba(255,255,255,0.3),
    inset 0 1px 0 rgba(255,255,255,0.6),
    inset 0 -1px 0 rgba(0,0,0,0.2),
    0 4px 20px rgba(0,0,0,0.4),
    0 0 18px rgba(200,200,200,0.25);
  transform: translateY(-1px);
}

.silver-collection-btn:active {
  transform: translateY(0);
  box-shadow:
    0 0 0 1px rgba(255,255,255,0.15),
    inset 0 2px 4px rgba(0,0,0,0.2),
    0 1px 4px rgba(0,0,0,0.3);
}

/* ─── Collection buttons wrapper + Gold Collection Button ───────────── */
.collection-btns {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  flex-shrink: 0;
}

.silver-btn-label--xshort { display: none; }

.gold-collection-btn {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
  text-decoration: none;
  position: relative;
  padding: 0.6rem 1.4rem;
  border-radius: 2px;
  background: linear-gradient(
    135deg,
    #6b4a05 0%,
    #a67c1a 18%,
    #d9b24a 35%,
    #fbe9a6 50%,
    #d4a935 65%,
    #a07418 80%,
    #5e4004 100%
  );
  background-size: 200% 200%;
  box-shadow:
    0 0 0 1px rgba(255,232,150,0.25),
    inset 0 1px 0 rgba(255,244,200,0.55),
    inset 0 -1px 0 rgba(60,35,0,0.3),
    0 2px 12px rgba(0,0,0,0.35),
    0 1px 3px rgba(0,0,0,0.2);
  transition: background-position 0.5s ease, box-shadow 0.3s ease, transform 0.2s ease;
  animation: silverShimmer 4s ease-in-out infinite;
}

.gold-collection-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 2px;
  background: linear-gradient(180deg, rgba(255,255,255,0.3) 0%, rgba(255,255,255,0) 55%, rgba(0,0,0,0.12) 100%);
  pointer-events: none;
}

.gold-collection-btn .silver-btn-label {
  color: #2b1b00;
  text-shadow: 0 1px 0 rgba(255,240,180,0.6), 0 -1px 0 rgba(60,35,0,0.2);
}

.gold-collection-btn .silver-btn-icon { filter: drop-shadow(0 1px 0 rgba(255,240,180,0.5)); }

.gold-collection-btn:hover {
  background-position: 100% 0%;
  box-shadow:
    0 0 0 1px rgba(255,232,150,0.4),
    inset 0 1px 0 rgba(255,244,200,0.7),
    inset 0 -1px 0 rgba(60,35,0,0.25),
    0 4px 20px rgba(0,0,0,0.4),
    0 0 18px rgba(230,190,70,0.4);
  transform: translateY(-1px);
}

.gold-collection-btn:active {
  transform: translateY(0);
  box-shadow: 0 0 0 1px rgba(255,232,150,0.2), inset 0 2px 4px rgba(60,35,0,0.3), 0 1px 4px rgba(0,0,0,0.3);
}


@media (max-width: 768px) {
  #header {
    padding: 1.1rem 1.25rem;
    gap: 0;
    justify-content: space-between;
    overflow: hidden;
  }

  #header.scrolled {
    padding: 0.9rem 1.25rem;
  }

  #header-nav {
    display: none;
  }

  .header-cta {
    display: none;
  }

  .header-logo-text {
    font-size: 1rem;
    white-space: nowrap;
  }

  .header-logo-img {
    height: 36px;
    max-width: 120px;
  }

  .collection-btns { gap: 0.45rem; }

  /* Silver + Gold btns: compact on mobile */
  .silver-collection-btn,
  .gold-collection-btn {
    padding: 0.38rem 0.7rem;
    flex-shrink: 0;
  }

  .silver-btn-inner {
    gap: 0.35rem;
  }

  .silver-btn-label--full {
    display: none;
  }

  .silver-btn-label--short {
    display: inline;
    font-size: 0.6rem;
    letter-spacing: 0.1em;
  }

  .silver-btn-icon {
    width: 12px;
    height: 12px;
    flex-shrink: 0;
  }
}

/* Very small phones: logo + two buttons must fit one row */
@media (max-width: 480px) {
  .silver-btn-label--short { display: none; }
  .silver-btn-label--xshort {
    display: inline;
    font-size: 0.6rem;
    letter-spacing: 0.1em;
  }
  .silver-collection-btn,
  .gold-collection-btn { padding: 0.38rem 0.6rem; }
  .collection-btns { gap: 0.35rem; }
}