/* ==========================================================================
   background.css — Marketplace Background System
   Identitas: HITAM + UNGU, atmosfer game store premium.

   Cara pakai di halaman lain (Home, Product, Detail, Checkout, dst.):
   1. <link> css/theme.css, lalu css/background.css; <script src="js/background.js">.
   2. Taruh blok .marketplace-background tepat setelah <body>.
   3. Bungkus tiap section dengan .zone + data-zone (hero, stats, products,
      faq, contact, footer) dan isi dengan <div class="container">.
   4. Tambah .bg-grid pada zone yang butuh garis teknis halus.

   Urutan layer (z-index):
     0  base          1  ambient       2  artwork (hero)
     3  geometry      4  particles     5  noise
     10 konten (main/footer)           20 navbar

   Daftar isi:
   1. Layer tetap (base, ambient, particles, noise)
   2. Zona section (hero, stats, products, faq, contact, footer)
   3. Garis teknis (grid)
   4. Artwork sinematik (hero) + cover game
   5. Geometri halus
   6. Responsif (tablet, mobile)
   7. Reduced motion
   ========================================================================== */

html {
  background: var(--bg-black);
}

main,
footer {
  position: relative;
  z-index: 10;
}


/* 1. Layer tetap
   -------------------------------------------------------------------------- */
.marketplace-background {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  height: 100lvh;                 /* stabil saat address bar mobile berubah */
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
  background: var(--bg-black);
}

.bg-base {
  position: absolute;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(120% 70% at 50% 0%, var(--bg-night), transparent 70%),
    linear-gradient(180deg, #09070f 0%, var(--bg-black) 55%, #0a0716 100%);
}

/* Cahaya ambient besar & lembut. Hanya transform yang dianimasikan. */
.bg-ambient {
  position: absolute;
  inset: 0;
  z-index: 1;
  opacity: 1;
  transition: opacity 1.6s ease;   /* cahaya mereda/menguat mengikuti section */
}

.bg-glow {
  position: absolute;
  border-radius: 50%;
  will-change: transform;
}

.bg-glow--1 {
  width: 72vw;
  height: 72vw;
  right: -20vw;
  top: -32vw;
  background: radial-gradient(closest-side, rgba(139, 92, 246, .36), rgba(109, 40, 217, .12) 58%, transparent 100%);
  animation: bg-drift-1 28s ease-in-out infinite alternate;
}

.bg-glow--2 {
  width: 56vw;
  height: 56vw;
  left: -24vw;
  top: 34vh;
  background: radial-gradient(closest-side, rgba(91, 33, 182, .3), rgba(91, 33, 182, .1) 60%, transparent 100%);
  animation: bg-drift-2 36s ease-in-out infinite alternate;
}

.bg-glow--3 {
  width: 46vw;
  height: 46vw;
  right: 4vw;
  bottom: -26vw;
  background: radial-gradient(closest-side, rgba(167, 139, 250, .16), transparent 100%);
  animation: bg-drift-3 32s ease-in-out infinite alternate;
}

@keyframes bg-drift-1 {
  to { transform: translate3d(-4vw, 5vh, 0) scale(1.08); }
}

@keyframes bg-drift-2 {
  to { transform: translate3d(5vw, -4vh, 0) scale(1.1); }
}

@keyframes bg-drift-3 {
  to { transform: translate3d(-6vw, -3vh, 0) scale(1.06); }
}

/* Intensitas cahaya per zona (diatur background.js lewat data-zone) */
.marketplace-background[data-zone="hero"]     .bg-ambient { opacity: 1; }
.marketplace-background[data-zone="stats"]    .bg-ambient { opacity: .68; }
.marketplace-background[data-zone="products"] .bg-ambient { opacity: .34; }
.marketplace-background[data-zone="faq"]      .bg-ambient { opacity: .6; }
.marketplace-background[data-zone="contact"]  .bg-ambient { opacity: .85; }
.marketplace-background[data-zone="footer"]   .bg-ambient { opacity: .6; }

/* Partikel: sedikit, kecil, sangat lambat (dibuat oleh background.js) */
.bg-particles {
  position: absolute;
  inset: 0;
  z-index: 4;
}

.bg-particle {
  position: absolute;
  width: var(--s, 2px);
  height: var(--s, 2px);
  border-radius: 50%;
  background: rgba(216, 204, 255, .85);
  opacity: 0;
  animation: bg-particle var(--t, 60s) linear var(--delay, 0s) infinite;
}

@keyframes bg-particle {
  0%   { opacity: 0; transform: translate3d(0, 0, 0); }
  15%  { opacity: var(--o, .4); }
  85%  { opacity: var(--o, .4); }
  100% { opacity: 0; transform: translate3d(var(--dx, 20px), -180px, 0); }
}

/* Grain tipis supaya tidak terlalu polos/digital */
.bg-noise {
  position: absolute;
  inset: 0;
  z-index: 5;
  opacity: .055;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 0 0 0 .6 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 160px 160px;
}


/* 2. Zona section
   --------------------------------------------------------------------------
   Tiap zona punya atmosfer sendiri. Tepi atas/bawahnya memudar (mask) supaya
   cahaya turun halus dari satu section ke section berikutnya.
   -------------------------------------------------------------------------- */
.zone {
  --fade-y: linear-gradient(180deg, transparent 0%, #000 30%, #000 70%, transparent 100%);
  --grid-size: clamp(56px, calc(72 * var(--unit)), 84px);
  position: relative;
  isolation: isolate;
}

.zone > .container {
  position: relative;
  z-index: 2;
}

.zone::before,
.zone::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
}

/* HERO — paling kaya: cahaya ungu kuat, mereda ke bawah */
.zone--hero::before {
  background:
    radial-gradient(60% 85% at 80% 28%, rgba(139, 92, 246, .46), transparent 65%),
    radial-gradient(42% 52% at 96% 6%, rgba(196, 181, 253, .2), transparent 70%),
    radial-gradient(55% 70% at 4% 98%, rgba(76, 29, 149, .4), transparent 70%),
    linear-gradient(180deg, rgba(26, 16, 56, .5), transparent 90%);
  -webkit-mask-image: linear-gradient(180deg, #000 58%, transparent 100%);
  mask-image: linear-gradient(180deg, #000 58%, transparent 100%);
}

/* STATISTICS — bersih, violet sangat tipis */
.zone--stats {
  padding-block: calc(8 * var(--unit)) calc(64 * var(--unit));
}

.zone--stats::before {
  background:
    radial-gradient(55% 140% at 50% 0%, rgba(139, 92, 246, .12), transparent 70%),
    linear-gradient(180deg, transparent, rgba(13, 10, 24, .6) 50%, transparent);
  -webkit-mask-image: var(--fade-y);
  mask-image: var(--fade-y);
}

/* PRODUCTS — paling tenang: hampir hitam, glow tipis, garis teknis */
.zone--products::before {
  background:
    radial-gradient(52% 34% at 50% 0%, rgba(124, 58, 237, .15), transparent 72%),
    radial-gradient(30% 22% at 100% 60%, rgba(139, 92, 246, .08), transparent 75%);
  -webkit-mask-image: var(--fade-y);
  mask-image: var(--fade-y);
}

/* FAQ — haze violet lembut */
.zone--faq::before {
  background:
    radial-gradient(70% 90% at 50% 50%, rgba(139, 92, 246, .22), transparent 72%),
    radial-gradient(40% 50% at 100% 0%, rgba(196, 181, 253, .07), transparent 70%);
  -webkit-mask-image: var(--fade-y);
  mask-image: var(--fade-y);
}

/* CONTACT — lebih atmosferik, makin dalam ke bawah menuju footer */
.zone--contact::before {
  background:
    radial-gradient(90% 90% at 50% 118%, rgba(109, 40, 217, .55), transparent 68%),
    radial-gradient(45% 55% at 12% 25%, rgba(139, 92, 246, .2), transparent 70%),
    radial-gradient(40% 50% at 88% 40%, rgba(196, 181, 253, .1), transparent 70%);
  -webkit-mask-image: linear-gradient(180deg, transparent 0%, #000 20%);
  mask-image: linear-gradient(180deg, transparent 0%, #000 20%);
}

.zone--contact::after {
  background: linear-gradient(180deg, transparent 55%, rgba(26, 16, 56, .7) 100%);
}

/* FOOTER — deep purple, bukan hitam penuh */
.zone--footer {
  background: linear-gradient(180deg, rgba(26, 16, 56, .7) 0%, var(--bg-violet-dark) 45%, #140b2e 100%);
  border-top: 0;
}

.zone--footer::before {
  background: radial-gradient(60% 130% at 50% 0%, rgba(167, 139, 250, .22), transparent 70%);
  -webkit-mask-image: linear-gradient(180deg, transparent 0%, #000 55%);
  mask-image: linear-gradient(180deg, transparent 0%, #000 55%);
}


/* 3. Garis teknis (grid)
   --------------------------------------------------------------------------
   Garis tipis + titik di persimpangan. Sangat redup, memudar ke tepi.
   -------------------------------------------------------------------------- */
.bg-grid::after {
  background-image:
    radial-gradient(circle at 0 0, rgba(196, 181, 253, .34) 0 1px, transparent 1.8px),
    linear-gradient(rgba(196, 181, 253, .055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(196, 181, 253, .055) 1px, transparent 1px);
  background-size: var(--grid-size) var(--grid-size);
  opacity: .55;
}

.zone--hero.bg-grid::after {
  -webkit-mask-image: radial-gradient(60% 65% at 76% 24%, #000, transparent 78%);
  mask-image: radial-gradient(60% 65% at 76% 24%, #000, transparent 78%);
}

/* Di Products, grid hanya terlihat di area atas/kontrol — tidak di bawah kartu */
.zone--products.bg-grid::after {
  -webkit-mask-image: radial-gradient(85% 38% at 50% 0%, #000, transparent 85%);
  mask-image: radial-gradient(85% 38% at 50% 0%, #000, transparent 85%);
}


/* 4. Artwork sinematik (hero)
   --------------------------------------------------------------------------
   Komposisi 3 cover game bertumpuk (kedalaman lewat blur + opacity), memudar
   ke kiri & bawah lewat mask agar menyatu dengan background.
   Untuk memakai cover asli: style="--cover-img:url(cover.jpg)" pada .bg-cover.
   -------------------------------------------------------------------------- */
.bg-artwork {
  position: absolute;
  z-index: 0;
  right: -3%;
  top: 6%;
  width: 58%;
  height: 92%;
  pointer-events: none;
  will-change: transform;
  -webkit-mask-image:
    linear-gradient(90deg, transparent 0%, #000 38%),
    linear-gradient(180deg, transparent 0%, #000 16%, #000 58%, transparent 100%);
  -webkit-mask-composite: source-in;
  mask-image:
    linear-gradient(90deg, transparent 0%, #000 38%),
    linear-gradient(180deg, transparent 0%, #000 16%, #000 58%, transparent 100%);
  mask-composite: intersect;
}

/* Vignette ringan */
.bg-artwork::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 4;
  background: radial-gradient(70% 70% at 55% 45%, transparent 40%, rgba(7, 6, 12, .62) 100%);
}

/* Berkas cahaya diagonal */
.bg-artwork__beam {
  position: absolute;
  inset: -10% 0;
  z-index: 3;
  background: linear-gradient(104deg, transparent 38%, rgba(196, 181, 253, .1) 47%, transparent 56%);
}

.bg-cover {
  --cover-sky: linear-gradient(180deg, #2b1a5e 0%, #4c2a9a 40%, #1a0f3a 100%);
  position: absolute;
  aspect-ratio: 2 / 3;
  overflow: hidden;
  border-radius: calc(22 * var(--unit));
  border: 1px solid rgba(196, 181, 253, .16);
  background: var(--cover-img, none) center / cover no-repeat, var(--cover-sky);
  box-shadow: 0 40px 80px -30px rgba(0, 0, 0, .85), inset 0 1px 0 rgba(255, 255, 255, .08);
  will-change: transform;
}

.bg-cover::before,
.bg-cover::after {
  content: "";
  position: absolute;
}

/* Cover A — belakang kiri: bulan + pegunungan */
.bg-cover--a {
  --cover-sky: linear-gradient(180deg, #3a2278 0%, #5b36b8 42%, #1d1042 100%);
  z-index: 1;
  left: 4%;
  top: 20%;
  width: 30%;
  opacity: .5;
  filter: blur(3px);
  transform: rotate(-7deg);
  animation: bg-cover-a 30s ease-in-out infinite alternate;
}

.bg-cover--a::before {
  width: 44%;
  aspect-ratio: 1;
  left: 50%;
  top: 14%;
  margin-left: -22%;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #cdbfff, #8b5cf6 52%, #3b1a7a 100%);
  box-shadow: 0 0 60px 6px rgba(139, 92, 246, .4);
}

.bg-cover--a::after {
  left: 0;
  right: 0;
  bottom: 0;
  height: 46%;
  background: linear-gradient(180deg, #2a1856, #0b0714);
  clip-path: polygon(0 38%, 14% 18%, 27% 40%, 44% 6%, 60% 36%, 76% 14%, 100% 44%, 100% 100%, 0 100%);
}

/* Cover B — utama, tengah: portal + menara */
.bg-cover--b {
  --cover-sky: linear-gradient(180deg, #120a2e 0%, #3b1f86 55%, #150c32 100%);
  z-index: 3;
  left: 31%;
  top: 4%;
  width: 38%;
  opacity: .6;
  transform: rotate(4deg);
  animation: bg-cover-b 26s ease-in-out infinite alternate;
}

.bg-cover--b::before {
  width: 54%;
  aspect-ratio: 1;
  left: 50%;
  top: 12%;
  margin-left: -27%;
  border-radius: 50%;
  border: 4px solid rgba(196, 181, 253, .7);
  box-shadow: 0 0 50px 4px rgba(139, 92, 246, .45), inset 0 0 36px rgba(139, 92, 246, .35);
}

.bg-cover--b::after {
  left: 0;
  right: 0;
  bottom: 0;
  height: 58%;
  background: linear-gradient(180deg, #24134f, #090614);
  clip-path: polygon(0 100%, 0 62%, 12% 62%, 12% 40%, 20% 40%, 20% 70%, 34% 70%, 34% 22%, 40% 8%, 46% 22%, 46% 66%, 60% 66%, 60% 50%, 72% 50%, 72% 74%, 86% 74%, 86% 58%, 100% 58%, 100% 100%);
}

/* Cover C — kanan: matahari rendah + bukit pasir */
.bg-cover--c {
  --cover-sky: linear-gradient(180deg, #1b1038 0%, #6d3fd6 52%, #c4a8ff 62%, #2a1658 63%, #0d0820 100%);
  z-index: 2;
  left: 63%;
  top: 28%;
  width: 30%;
  opacity: .5;
  filter: blur(1.5px);
  transform: rotate(9deg);
  animation: bg-cover-c 34s ease-in-out infinite alternate;
}

.bg-cover--c::before {
  width: 50%;
  aspect-ratio: 1;
  left: 50%;
  top: 28%;
  margin-left: -25%;
  border-radius: 50%;
  background: radial-gradient(circle, #d9ccff 0%, #a98bf5 38%, rgba(139, 92, 246, 0) 70%);
}

.bg-cover--c::after {
  left: 0;
  right: 0;
  bottom: 0;
  height: 48%;
  background: linear-gradient(180deg, #2a1658, #0d0820);
  clip-path: polygon(0 55%, 18% 38%, 36% 52%, 58% 30%, 80% 50%, 100% 36%, 100% 100%, 0 100%);
}

@keyframes bg-cover-a {
  from { transform: rotate(-7deg) translate3d(0, 0, 0); }
  to   { transform: rotate(-7deg) translate3d(0, -14px, 0); }
}

@keyframes bg-cover-b {
  from { transform: rotate(4deg) translate3d(0, 0, 0); }
  to   { transform: rotate(4deg) translate3d(0, -12px, 0); }
}

@keyframes bg-cover-c {
  from { transform: rotate(9deg) translate3d(0, 0, 0); }
  to   { transform: rotate(9deg) translate3d(0, -16px, 0); }
}


/* 5. Geometri halus (hero)
   --------------------------------------------------------------------------
   Cincin, busur, garis diagonal: tipis dan redup.
   -------------------------------------------------------------------------- */
.bg-geometry {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  will-change: transform;
}

.bg-geo {
  position: absolute;
  display: block;
  will-change: transform;
}

.bg-geo--ring {
  width: min(38vw, 620px);
  aspect-ratio: 1;
  right: 2%;
  top: 4%;
  border-radius: 50%;
  border: 1px solid rgba(196, 181, 253, .14);
  animation: bg-float-1 32s ease-in-out infinite alternate;
}

.bg-geo--ring::after {
  content: "";
  position: absolute;
  inset: 12%;
  border-radius: 50%;
  border: 1px solid rgba(196, 181, 253, .08);
}

.bg-geo--arc {
  width: min(22vw, 360px);
  aspect-ratio: 1;
  left: 3%;
  bottom: 6%;
  border-radius: 50%;
  border: 1px solid transparent;
  border-top-color: rgba(196, 181, 253, .22);
  border-right-color: rgba(196, 181, 253, .1);
  transform: rotate(-24deg);
  animation: bg-float-2 36s ease-in-out infinite alternate;
}

.bg-geo--lines {
  width: 34%;
  height: 46%;
  right: 0;
  bottom: 0;
  background: repeating-linear-gradient(115deg, transparent 0 28px, rgba(196, 181, 253, .07) 28px 29px);
  -webkit-mask-image: linear-gradient(135deg, transparent 20%, #000 80%);
  mask-image: linear-gradient(135deg, transparent 20%, #000 80%);
}

@keyframes bg-float-1 {
  to { transform: translate3d(-14px, 18px, 0) rotate(6deg); }
}

@keyframes bg-float-2 {
  to { transform: translate3d(12px, -14px, 0) rotate(-24deg); }
}


/* 6. Responsif
   -------------------------------------------------------------------------- */
/* Hero bertumpuk: artwork pindah ke belakang area visual (bawah hero) */
@media (max-width: 900px) {
  .bg-artwork {
    top: auto;
    bottom: -2%;
    right: -12%;
    width: 124%;
    height: 52%;
    opacity: .65;
  }

  .bg-cover--c {
    display: none;
  }
}

/* Tablet: kurangi blur, geometri, parallax */
@media (max-width: 1024px) {
  .bg-cover--a,
  .bg-cover--c {
    filter: none;
  }

  .bg-geo--lines {
    display: none;
  }
}

/* Mobile: statis dan ringan (tanpa animasi background, tanpa geometri) */
@media (max-width: 640px) {
  .bg-glow,
  .bg-cover {
    animation: none;
  }

  .bg-geometry {
    display: none;
  }

  .bg-noise {
    opacity: .04;
  }

  .zone--hero::before {
    background:
      radial-gradient(90% 55% at 80% 20%, rgba(139, 92, 246, .4), transparent 68%),
      radial-gradient(80% 50% at 0% 100%, rgba(76, 29, 149, .36), transparent 70%),
      linear-gradient(180deg, rgba(26, 16, 56, .5), transparent 90%);
  }
}


/* 7. Reduced motion
   --------------------------------------------------------------------------
   Semua gerak dimatikan; tampilan statis tetap bagus.
   Partikel tidak dibuat sama sekali oleh background.js.
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  .bg-glow,
  .bg-geo,
  .bg-cover {
    animation: none !important;
  }

  .bg-ambient {
    transition: none;
  }

  .bg-artwork,
  .bg-geometry {
    transform: none !important;
  }
}