:root {
  --bg: #0f1724;
  --panel: #0b1a2b;
  --accent: #072e6b;
  --accent-2: #0a47a1;
  --muted: #d1d5db;
  --white: #fff;
  --radius: 16px;
  --max-width: 1100px;
  font-family: 'Roboto', system-ui, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body { background: var(--bg); color: var(--white); }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 20px; }


header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(12, 12, 12, 0.8);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}
.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 20px;
}
.brand img { height: 52px; display: block; padding-right: 20px; }
nav ul { display: flex; gap: 22px; list-style: none; }
nav a {
  color: var(--white);
  text-decoration: none;
  font-weight: 600; transition: color .3s ease;
}
nav a:hover { color: var(--accent-2); }
.cta {
  background: linear-gradient(90deg, var(--accent-2), var(--accent));
  padding: 10px 18px;
  border-radius: 10px;
  color: white;
  font-weight: 700;
  text-decoration: none;
  transition: transform .2s ease;
}
.cta:hover { transform: scale(1.05); }


.page-hero { padding: 80px 20px 30px; text-align: center; }
.page-title {
  font-family: 'Montserrat', system-ui, sans-serif;
  font-weight: 800;
  font-size: 2.2rem;
  display: inline-block;
  position: relative;
}
.page-title::after {
  content: "";
  display: block;
  width: 220px; height: 4px;
  background: var(--accent-2);
  margin: 10px auto 0;
  border-radius: 2px;
}
.lead { color: var(--muted); margin-top: 10px; }


.inventory { padding: 30px 20px 80px; }
.inventory-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 22px;
}


.item-card {
  background: var(--panel);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 8px 20px rgba(0,0,0,0.35);
  transition: transform .18s ease, box-shadow .18s ease;
}

.item-link {
  color: inherit; text-decoration: none; display: block; height: 100%;
}

.item-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 30px rgba(0,0,0,0.5);
}


.item-media {
  padding: 16px;
  display: grid; place-items: center;
  background: rgba(255,255,255,0.02);
}
.item-media img {
  width: 100%;
  max-width: 220px;
  border-radius: 12px;
  object-fit: contain;
}


.item-body { padding: 16px 18px 20px; }
.item-title {
  font-family: 'Montserrat', system-ui, sans-serif;
  font-weight: 700;
  font-size: 1.1rem;
  margin-bottom: 10px;
}
.specs {
  list-style: none;
  color: var(--muted);
  line-height: 1.6;
}
.specs li { padding-left: 0; }


.item-actions { margin-top: 14px; }
.btn {
  display: inline-block;
  padding: 10px 14px;
  border-radius: 10px;
  font-weight: 700;
  text-decoration: none;
  border: 1px solid rgba(255,255,255,0.18);
}
.btn-primary { background: linear-gradient(90deg, var(--accent-2), var(--accent)); color: white; }


footer {
  padding: 30px;
  text-align: center;
  color: var(--muted);
  border-top: 1px solid rgba(255,255,255,0.2);
}


@media (max-width: 900px) {
  .page-hero { padding-top: 70px; }
}

/* =========================
   MOBILE OPTIMIZATIONS
   ========================= */


.page-title { font-size: clamp(26px, 6vw, 36px); }
.lead       { font-size: clamp(14px, 3.6vw, 18px); }


@media (max-width: 900px){
  .brand img { height: 40px; }
  header .nav { gap: 10px; padding: 10px 16px; }
}


@media (max-width: 900px){
  .inventory-grid { grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 18px; }
  .item-media img { max-width: 200px; }
}
@media (max-width: 560px){
  .inventory-grid { grid-template-columns: 1fr; gap: 16px; }
  .item-body { padding: 14px; }
  .btn { width: 100%; text-align: center; }
}


@media (max-width: 560px){
  footer { padding: 22px; }
}


.filter-btn {
  --bd: #1a2a3a;              /* fallback border */
  --bg: #0e1b2a;              /* fallback background */
  --fg: #ffffff;              /* fallback text */
  --active: #00b4d8;          /* fallback active accent */

  border: 1px solid var(--border, var(--bd));
  background: var(--button-bg, var(--bg));
  color: var(--button-fg, var(--fg));
  padding: .55rem .95rem;
  border-radius: .6rem;
  font: 600 0.95rem/1.1 system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  letter-spacing: .2px;
  cursor: pointer;
  transition: transform .15s ease, background .2s ease, color .2s ease, border-color .2s ease, box-shadow .2s ease;
}

.filter-btn:hover { transform: translateY(-1px); }

.filter-btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--active, #00b4d8) 35%, transparent);
  border-color: var(--active, #00b4d8);
}

.filter-btn[aria-pressed="true"] {
  background: linear-gradient(90deg, var(--accent, #00b4d8), var(--accent-2, #38bdf8));
  color: #07131f;
  border-color: transparent;
}

.item-card.is-hidden { display: none !important; }

/* compact on small screens */
@media (max-width: 480px) {
  .filter-btn { padding: .5rem .75rem; font-size: .9rem; }
}