:root {
  --bg: #000;
  --card: rgba(12, 12, 14, 0.85);
  --white: #fff;
  --muted: #a8a8b0;
  --glow: 0 0 6px #fff, 0 0 18px rgba(255, 255, 255, 0.55), 0 0 40px rgba(255, 255, 255, 0.25);
  --glow-soft: 0 0 10px rgba(255, 255, 255, 0.18), 0 0 30px rgba(255, 255, 255, 0.08);
  --radius: 28px;
  --ease: cubic-bezier(.2, .8, .2, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: "Outfit", system-ui, sans-serif;
  background: var(--bg);
  color: var(--white);
  min-height: 100vh;
  overflow-x: hidden;
}

.bg-glow {
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background:
    radial-gradient(600px circle at 20% 10%, rgba(255,255,255,.07), transparent 60%),
    radial-gradient(500px circle at 85% 60%, rgba(255,255,255,.05), transparent 60%);
  animation: drift 18s ease-in-out infinite alternate;
}
@keyframes drift { to { transform: translate(-30px, 20px) scale(1.05); } }

/* NAV */
.nav {
  position: sticky; top: 14px; z-index: 10;
  margin: 14px auto 0; width: min(1100px, 94%);
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 14px 26px;
  background: rgba(0,0,0,.7); backdrop-filter: blur(14px);
  border: 1px solid rgba(255,255,255,.6); border-radius: 999px;
  box-shadow: var(--glow-soft);
}
.logo {
  font-weight: 800; letter-spacing: 3px; color: #fff; text-decoration: none;
  text-shadow: var(--glow);
}
.logo span { font-weight: 300; margin-left: 4px; }
.nav nav { display: flex; gap: 6px; flex-wrap: wrap; }
.nav nav a {
  color: #fff; text-decoration: none; padding: 8px 16px; border-radius: 999px;
  transition: all .3s var(--ease);
}
.nav nav a:hover { background: #fff; color: #000; box-shadow: var(--glow); }

/* LAYOUT */
main { width: min(1100px, 94%); margin: 30px auto; display: grid; gap: 30px; }

.card {
  background: var(--card);
  border: 1px solid rgba(255,255,255,.35);
  border-radius: var(--radius);
  padding: 40px clamp(20px, 5vw, 56px);
  box-shadow: var(--glow-soft), inset 0 0 30px rgba(255,255,255,.03);
  transition: box-shadow .4s var(--ease), border-color .4s var(--ease);
  scroll-margin-top: 100px;
}
.card:hover { border-color: rgba(255,255,255,.7); box-shadow: 0 0 20px rgba(255,255,255,.22), 0 0 60px rgba(255,255,255,.08); }

.glow-text { text-shadow: var(--glow); }
h2 { font-size: 1.9rem; margin-bottom: 8px; }
.muted { color: var(--muted); }
.center { text-align: center; }

/* BUTTONS / INPUTS */
.btn {
  display: inline-block; cursor: pointer; font: inherit; font-weight: 600;
  color: #000; background: #fff; border: none; text-decoration: none;
  padding: 14px 28px; border-radius: 999px;
  box-shadow: var(--glow);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease);
}
.btn:hover { transform: translateY(-2px) scale(1.03); box-shadow: 0 0 10px #fff, 0 0 30px rgba(255,255,255,.8), 0 0 70px rgba(255,255,255,.4); }
.btn.ghost { background: transparent; color: #fff; border: 1px solid #fff; box-shadow: var(--glow-soft); }
.btn.ghost:hover { background: #fff; color: #000; }
.btn-big { font-size: 1.6rem; padding: 22px 60px; }

.pulse { animation: pulse 2.6s ease-in-out infinite; }
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 8px #fff, 0 0 24px rgba(255,255,255,.5), 0 0 50px rgba(255,255,255,.2); }
  50%      { box-shadow: 0 0 14px #fff, 0 0 40px rgba(255,255,255,.8), 0 0 90px rgba(255,255,255,.35); }
}

input[type="text"] {
  width: 100%; font: inherit; color: #fff;
  background: rgba(0,0,0,.6);
  border: 1px solid rgba(255,255,255,.4); border-radius: 999px;
  padding: 14px 22px; outline: none;
  transition: all .3s var(--ease);
}
input[type="text"]:focus { border-color: #fff; box-shadow: var(--glow); }
input::placeholder { color: #666; }

/* QC */
.qc-form { display: flex; gap: 12px; margin-top: 18px; }
.qc-result {
  margin-top: 22px; padding: 22px; border-radius: 22px;
  border: 1px solid rgba(255,255,255,.3); background: rgba(255,255,255,.03);
  animation: fadeUp .4s var(--ease);
}
.qc-result.error { border-color: rgba(255,120,120,.6); color: #ffb3b3; }
.qc-meta { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 16px; }
.tag {
  padding: 6px 14px; border-radius: 999px; border: 1px solid #fff;
  font-size: .9rem; box-shadow: var(--glow-soft);
}
.qc-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.qc-actions .btn { padding: 10px 20px; font-size: .95rem; }
.qc-note { margin-top: 14px; font-size: .85rem; }

/* TUTORIAL */
.tutorial { text-align: center; }
.title { font-size: clamp(2.4rem, 7vw, 4.5rem); font-weight: 800; letter-spacing: 4px; margin-bottom: 30px; }
.steps { list-style: none; max-width: 640px; margin: 44px auto 0; display: grid; gap: 14px; text-align: left; }
.steps li {
  display: flex; align-items: center; gap: 18px;
  padding: 16px 22px; border-radius: 22px;
  border: 1px solid rgba(255,255,255,.2); background: rgba(255,255,255,.02);
  font-size: 1.1rem; font-weight: 600;
  transition: all .35s var(--ease);
}
.steps li:hover { border-color: #fff; box-shadow: var(--glow-soft); transform: translateX(6px); }
.num {
  flex: 0 0 44px; height: 44px; display: grid; place-items: center;
  border-radius: 50%; background: #fff; color: #000; font-weight: 800;
  box-shadow: var(--glow);
}

/* ITEMS */
.search { margin: 18px 0 14px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 22px; }
.chip {
  cursor: pointer; font: inherit; color: #fff; background: transparent;
  border: 1px solid rgba(255,255,255,.4); border-radius: 999px; padding: 6px 16px;
  transition: all .3s var(--ease);
}
.chip.active, .chip:hover { background: #fff; color: #000; box-shadow: var(--glow); }

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 18px; }
.item {
  border-radius: 22px; overflow: hidden;
  border: 1px solid rgba(255,255,255,.25); background: rgba(255,255,255,.02);
  display: flex; flex-direction: column;
  transition: all .35s var(--ease);
  animation: fadeUp .4s var(--ease) both;
}
.item:hover { transform: translateY(-5px); border-color: #fff; box-shadow: var(--glow); }
.item img, .item .ph { width: 100%; aspect-ratio: 1; object-fit: cover; background: #111; }
.item .ph { display: grid; place-items: center; color: #444; font-size: 2rem; }
.item-body { padding: 14px 16px 16px; display: flex; flex-direction: column; gap: 6px; flex: 1; }
.item-name { font-weight: 600; }
.item-price { color: var(--muted); }
.item-actions { display: flex; gap: 8px; margin-top: auto; padding-top: 8px; }
.item-actions .btn { flex: 1; text-align: center; padding: 8px 10px; font-size: .85rem; }

footer { padding: 30px 0 40px; }

@keyframes fadeUp { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }

@media (max-width: 640px) {
  .nav { flex-direction: column; border-radius: var(--radius); }
  .qc-form { flex-direction: column; }
  .btn-big { font-size: 1.2rem; padding: 18px 36px; }
}