/* ==========================================================================
   THE MASTER BOX — AmberNord
   Scope: .master-box-page-container and children.
   Tokens: --color-gold --color-bg --color-text --color-border-gold
           --color-surface --nav-height --font-serif --font-sans
           --container-pad --t-fast --t-slow
   ========================================================================== */

/* --------------------------------------------------------------------------
   ROOT — page container, vertical rhythm aligned to global nav height.
   -------------------------------------------------------------------------- */
.master-box-page-container {
  padding: calc(var(--nav-height) + 60px) 0 120px;
  position: relative;
  z-index: 10;
  animation: theMasterBoxReveal 1.2s cubic-bezier(0.165, 0.84, 0.44, 1) forwards;
}

/* --------------------------------------------------------------------------
   ENTRANCE — smooth fade-and-rise on first paint.
   -------------------------------------------------------------------------- */
@keyframes theMasterBoxReveal {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: none; }
}

/* --------------------------------------------------------------------------
   SCROLL REVEAL — observed by IntersectionObserver in JS.
   -------------------------------------------------------------------------- */
.page-reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.page-reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* --------------------------------------------------------------------------
   REDUCED MOTION — disable all transforms and transitions.
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  .page-reveal,
  .master-box-page-container {
    animation: none;
    transition: none;
    opacity: 1;
    transform: none;
  }
}

/* --------------------------------------------------------------------------
   SUBPAGE HEADER — eyebrow plus h1 above the product layout.
   -------------------------------------------------------------------------- */
.subpage-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 80px;
  padding: 0 var(--container-pad);
}

.subpage-subtitle {
  display: inline-block;
  color: var(--color-gold);
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 4px;
  text-transform: uppercase;
  margin-bottom: 20px;
  border-bottom: 1px solid rgba(237, 163, 35, 0.4);
  padding-bottom: 10px;
}

.subpage-header h1 {
  color: var(--color-text);
  font-family: var(--font-serif);
  font-size: clamp(32px, 4vw, 52px);
  font-weight: 400;
  line-height: 1.2;
  margin: 0;
}

.subpage-header h1 span {
  font-style: italic;
  color: var(--color-gold);
}

/* --------------------------------------------------------------------------
   ACCESSIBILITY — skip link, focus ring, visually hidden helper.
   -------------------------------------------------------------------------- */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  background: var(--color-gold);
  color: #000;
  padding: 0.5rem 1rem;
  font-weight: 700;
  z-index: 9999;
  border-radius: 4px;
  text-decoration: none;
}

.skip-link:focus { top: 1rem; }

:focus-visible {
  outline: 2px solid var(--color-gold);
  outline-offset: 3px;
  border-radius: 3px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* --------------------------------------------------------------------------
   SECTION LAYOUT — outer wrapper with max-width and gutters.
   -------------------------------------------------------------------------- */
.master-box-section {
  max-width: 1200px;
  padding: 0 var(--container-pad);
  margin: 0 auto 120px;
}

/* --------------------------------------------------------------------------
   PRODUCT LAYOUT — two-column flex, gallery left, info right.
   -------------------------------------------------------------------------- */
.master-box-layout {
  display: flex;
  flex-wrap: wrap;
  gap: 60px;
  align-items: flex-start;
}

/* --------------------------------------------------------------------------
   GALLERY — main image plus thumbnail strip.
   -------------------------------------------------------------------------- */
.master-box-gallery {
  flex: 1 1 500px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 25px;
}

.master-box-main-image {
  width: 100%;
  height: 600px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.master-box-main-image__img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  transition: opacity var(--t-fast);
}

.master-box-thumbs {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  width: 100%;
}

.master-box-thumb {
  width: 75px;
  height: 75px;
  padding: 0;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 4px;
  cursor: pointer;
  overflow: hidden;
  transition: border-color var(--t-fast), transform var(--t-fast);
}

.master-box-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.master-box-thumb:hover {
  border-color: var(--color-gold);
  transform: translateY(-2px);
}

.master-box-thumb--active {
  border-color: var(--color-gold);
}

/* --------------------------------------------------------------------------
   INFO COLUMN — typographic stack right of gallery.
   -------------------------------------------------------------------------- */
.master-box-info {
  flex: 1 1 450px;
}

.master-box-info__heading {
  font-family: var(--font-serif);
  font-size: clamp(22px, 2.4vw, 28px);
  font-weight: 400;
  line-height: 1.3;
  color: var(--color-text);
  margin: 0 0 10px;
}

.master-box-info__heading span {
  display: block;
  font-style: italic;
  color: var(--color-gold);
  font-size: 0.85em;
  margin-top: 6px;
}

.master-box-info__price {
  font-family: var(--font-sans);
  font-size: 24px;
  font-weight: 700;
  color: var(--color-text);
  margin: 0 0 40px;
}

.master-box-info__intro {
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 300;
  line-height: 1.8;
  color: #d0d0d0;
  margin: 0 0 30px;
}

.master-box-info__intro strong {
  color: var(--color-text);
  font-weight: 500;
}

.master-box-info__intro .is-gold {
  color: var(--color-gold);
}

.master-box-info__subheading {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 400;
  color: var(--color-text);
  margin: 30px 0 15px;
}

.master-box-info__body {
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 300;
  line-height: 1.8;
  color: #d0d0d0;
  margin: 0 0 30px;
}

.master-box-info__body strong {
  color: var(--color-text);
  font-weight: 500;
}

/* --------------------------------------------------------------------------
   GLASS CARD — frosted panel containing the included list.
   -------------------------------------------------------------------------- */
.master-box-card {
  background: rgba(255, 255, 255, 0.04);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(237, 163, 35, 0.2);
  border-left: 3px solid var(--color-gold);
  border-radius: 12px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3),
              inset 0 1px 0 rgba(255, 255, 255, 0.06);
  padding: 18px 20px;
  margin-bottom: 30px;
}

.master-box-card__title {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--color-gold);
  margin: 0 0 12px;
}

.master-box-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.master-box-list__item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-family: var(--font-sans);
  font-size: 13px;
  line-height: 1.6;
  color: #b0b0b0;
  margin-bottom: 8px;
}

.master-box-list__item:last-child {
  margin-bottom: 0;
}

.master-box-list__item strong {
  color: var(--color-text);
  font-weight: 500;
}

.master-box-list__item .is-gold {
  color: var(--color-gold);
  font-weight: 500;
}

.master-box-list__bullet {
  color: var(--color-gold);
  flex: 0 0 auto;
}

.master-box-list__text {
  flex: 1 1 auto;
}

/* --------------------------------------------------------------------------
   PRIMARY CTA — outlined gold button to one-time Stripe checkout.
   -------------------------------------------------------------------------- */
.master-box-cta {
  display: block;
  width: 100%;
  background: #0a0a0a;
  border: 1px solid var(--color-gold);
  color: var(--color-gold);
  text-align: center;
  padding: 18px 0;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  text-decoration: none;
  border-radius: 4px;
  margin: 30px 0 20px;
  transition: background var(--t-fast), color var(--t-fast), box-shadow var(--t-fast), transform var(--t-fast);
}

.master-box-cta:hover {
  background: #111;
  color: var(--color-text);
  box-shadow: 0 5px 20px rgba(237, 163, 35, 0.2);
  transform: translateY(-2px);
}

/* --------------------------------------------------------------------------
   SUBSCRIPTION CTA — gold banner on top, dark price block below.
   -------------------------------------------------------------------------- */
.master-box-abo {
  display: block;
  width: 100%;
  border: 1px solid var(--color-gold);
  border-radius: 4px;
  text-decoration: none;
  overflow: hidden;
  margin-bottom: 30px;
  transition: transform var(--t-fast), box-shadow var(--t-fast);
}

.master-box-abo:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(237, 163, 35, 0.25);
}

.master-box-abo__top {
  display: block;
  background: var(--color-gold);
  color: #000;
  text-align: center;
  padding: 18px 10px;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
}

.master-box-abo__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #0a0a0a;
  padding: 15px 20px;
}

.master-box-abo__price-box {
  display: flex;
  flex-direction: column;
  text-align: left;
}

.master-box-abo__price {
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 4px;
}

.master-box-abo__subtext {
  color: #888;
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.master-box-abo__guarantee {
  color: var(--color-gold);
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* --------------------------------------------------------------------------
   SHIPPING NOTE — fine print at the bottom of the info column.
   -------------------------------------------------------------------------- */
.master-box-shipping {
  font-family: var(--font-sans);
  font-size: 13px;
  color: #b0b0b0;
  line-height: 1.6;
  margin-top: 20px;
  padding-top: 15px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.master-box-shipping__label {
  display: block;
  color: var(--color-gold);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  font-size: 11px;
  margin-bottom: 4px;
}

.master-box-shipping__text {
  margin: 0;
}

/* --------------------------------------------------------------------------
   WILL-CHANGE — applied only while entrance animation runs, removed in JS.
   -------------------------------------------------------------------------- */
.master-box-page-container.animating {
  will-change: opacity, transform;
}

/* --------------------------------------------------------------------------
   TABLET — single-column, smaller main image height.
   -------------------------------------------------------------------------- */
@media (max-width: 991px) {
  .master-box-page-container {
    padding-top: calc(var(--nav-height) + 30px);
    padding-bottom: 80px;
  }

  .subpage-header {
    margin-bottom: 50px;
  }

  .master-box-layout {
    gap: 40px;
  }

  .master-box-main-image {
    height: 450px;
  }

  .master-box-info__heading {
    font-size: 22px;
    margin-top: 10px;
  }

  .master-box-section {
    margin-bottom: 80px;
  }
}

/* --------------------------------------------------------------------------
   MOBILE — tighter rhythm, smaller thumbnails.
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
  .master-box-main-image {
    height: 380px;
  }

  .master-box-thumb {
    width: 64px;
    height: 64px;
  }

  .master-box-info__price {
    font-size: 22px;
    margin-bottom: 30px;
  }

  .master-box-info__intro,
  .master-box-info__body {
    font-size: 14px;
  }

  .master-box-card {
    padding: 16px;
  }

  .master-box-cta {
    padding: 16px 0;
  }

  .master-box-abo__top {
    padding: 16px 10px;
  }
}