/* ============================================
   TECHSTORE — PRODUCT LISTING
   Font: Poppins (body) + Montserrat (headings)
   Theme: Dark, high-contrast, premium
   ============================================ */

/* ===== CSS VARIABLES ===== */
:root {
  --bg-base:       #0d0d14;
  --bg-surface:    #13131f;
  --bg-elevated:   #1a1a2e;
  --bg-input:      #1e1e30;
  --bg-select:     #1a1a2e;
  --border:        #2a2a42;
  --border-hover:  #3d3d60;

  --accent:        #4f8ef7;
  --accent-glow:   rgba(79,142,247,0.15);
  --accent-hover:  #6aa0ff;
  --accent-dark:   #1a3a7a;

  --text-primary:  #f0f0f8;
  --text-secondary:#a0a0c0;
  --text-muted:    #606080;

  --success:       #34d399;
  --warning:       #fbbf24;
  --danger:        #f87171;

  --gap:           1.5rem;
  --radius-sm:     8px;
  --radius-md:     14px;
  --radius-lg:     20px;

  --ease:          cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --speed:         0.22s;
}

/* ===== RESET ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg-base);
  color: var(--text-primary);
  font-family: 'Poppins', sans-serif;
  font-size: 15px;
  line-height: 1.65;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* ===== HEADER ===== */
.header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: rgba(13,13,20,0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0.85rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.82rem;
  font-weight: 500;
  padding: 0.4rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: 20px;
  transition: all var(--speed) var(--ease);
}
.back-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-glow);
}

.logo {
  font-family: 'Montserrat', sans-serif;
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--text-primary);
}
.logo span { color: var(--accent); }

.cart-info {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.82rem;
  color: var(--text-secondary);
  font-weight: 500;
}
.cart-info i { color: var(--accent); font-size: 0.9rem; }

/* ===== HERO ===== */
.hero {
  max-width: 1280px;
  margin: 0 auto;
  padding: 3.5rem 2rem 2rem;
}

.hero-tag {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 0.75rem;
}

.hero h1 {
  font-family: 'Montserrat', sans-serif;
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -1.5px;
  color: var(--text-primary);
  margin-bottom: 0.85rem;
}
.hero h1 span { color: var(--accent); }

.hero-sub {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 480px;
}

/* ===== CONTROLS PANEL ===== */
.controls-panel {
  max-width: 1280px;
  margin: 0 auto 1.5rem;
  padding: 0 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* Search */
.search-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: 1.1rem;
  color: var(--text-muted);
  font-size: 0.9rem;
  pointer-events: none;
  transition: color var(--speed);
}

#search-input {
  width: 100%;
  padding: 0.9rem 3rem 0.9rem 2.75rem;
  background: var(--bg-input);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: 'Poppins', sans-serif;
  font-size: 0.92rem;
  outline: none;
  transition: border-color var(--speed) var(--ease),
              box-shadow var(--speed) var(--ease);
}
#search-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.search-wrap:focus-within .search-icon { color: var(--accent); }
#search-input::placeholder { color: var(--text-muted); }

.clear-btn {
  position: absolute;
  right: 1rem;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.3rem 0.5rem;
  border-radius: 4px;
  display: none;
  font-size: 0.85rem;
  transition: color var(--speed);
}
.clear-btn:hover { color: var(--danger); }
.clear-btn.visible { display: flex; align-items: center; }

/* ===== FILTERS ROW ===== */
.filters-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  align-items: flex-end;
  padding: 1.25rem 1.5rem;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  flex: 1;
  min-width: 160px;
}

.filter-label {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1.2px;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}
.filter-label strong {
  color: var(--accent);
  font-weight: 700;
  margin-left: 0.25rem;
}

/* ──────────────────────────────────────────────
   FIXED SELECT DROPDOWNS — dark, always readable
   ────────────────────────────────────────────── */
.filter-select {
  width: 100%;
  padding: 0.75rem 2.8rem 0.75rem 1rem;
  background-color: var(--bg-select);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: 'Poppins', sans-serif;
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  outline: none;
  transition: border-color var(--speed) var(--ease),
              background-color var(--speed) var(--ease),
              box-shadow var(--speed) var(--ease);
  /* Remove native arrow */
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  /* Custom dark arrow */
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 24 24'%3E%3Cpath fill='%23a0a0c0' d='M7 10l5 5 5-5z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.8rem center;
  /* Forces browser-native popup to render in dark mode */
  color-scheme: dark;
}

.filter-select:hover {
  border-color: var(--border-hover);
  background-color: #20203a;
}

.filter-select:focus {
  border-color: var(--accent);
  background-color: #20203a;
  box-shadow: 0 0 0 3px var(--accent-glow);
  color: var(--text-primary);
}

.filter-select option {
  background-color: #1a1a2e;
  color: #f0f0f8;
  font-size: 0.9rem;
}

.filter-select option:checked {
  background-color: #2a3a5a;
  color: #ffffff;
  font-weight: 600;
}

/* ──────────────────────────────────────────────
   IMPROVED PRICE RANGE SLIDER
   ────────────────────────────────────────────── */
.range-group { min-width: 220px; }

.range-track {
  position: relative;
  padding-top: 0.75rem;
}

/* The track itself */
#price-filter {
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  outline: none;
  cursor: pointer;
  position: relative;
  z-index: 1;
}

/* Webkit thumb */
#price-filter::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 22px;
  height: 22px;
  background: var(--accent);
  border-radius: 50%;
  cursor: pointer;
  border: 3px solid var(--bg-base);
  box-shadow: 0 0 0 2px var(--accent), 0 4px 12px rgba(79,142,247,0.4);
  transition: transform var(--speed) var(--ease),
              box-shadow var(--speed) var(--ease);
}
#price-filter::-webkit-slider-thumb:hover,
#price-filter:active::-webkit-slider-thumb {
  transform: scale(1.25);
  box-shadow: 0 0 0 4px rgba(79,142,247,0.25), 0 6px 20px rgba(79,142,247,0.5);
}

/* Firefox thumb */
#price-filter::-moz-range-thumb {
  width: 22px;
  height: 22px;
  background: var(--accent);
  border-radius: 50%;
  border: 3px solid var(--bg-base);
  cursor: pointer;
  box-shadow: 0 0 0 2px var(--accent), 0 4px 12px rgba(79,142,247,0.4);
  transition: transform var(--speed), box-shadow var(--speed);
}
#price-filter::-moz-range-thumb:hover {
  transform: scale(1.25);
}

/* Firefox track */
#price-filter::-moz-range-track {
  height: 6px;
  background: var(--border);
  border-radius: 3px;
}

/* Accent-colored fill — uses a JS-driven custom property set on the element */
#price-filter {
  background: linear-gradient(
    to right,
    var(--accent) 0%,
    var(--accent) var(--fill, 100%),
    var(--border) var(--fill, 100%),
    var(--border) 100%
  );
}

/* Range fill overlay (fallback visual bar under slider) */
.range-fill {
  position: absolute;
  top: calc(0.75rem + 8px);   /* center on the 6px track */
  left: 0;
  height: 6px;
  background: var(--accent);
  border-radius: 3px;
  pointer-events: none;
  transition: width var(--speed) var(--ease);
  z-index: 0;
  /* width set dynamically by JS */
}

/* Reset Button */
.reset-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.75rem 1.25rem;
  background: transparent;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-family: 'Poppins', sans-serif;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--speed) var(--ease);
  white-space: nowrap;
  align-self: flex-end;
}
.reset-btn:hover {
  border-color: var(--danger);
  color: var(--danger);
  background: rgba(248,113,113,0.08);
}

/* Filter Status Bar */
.filter-status {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.result-count {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-weight: 500;
}

.active-filters { display: flex; flex-wrap: wrap; gap: 0.4rem; }

.filter-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  background: var(--accent-glow);
  border: 1px solid rgba(79,142,247,0.3);
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.25rem 0.7rem;
  border-radius: 20px;
  letter-spacing: 0.3px;
}

/* ===== LOADING STATE ===== */
.loading-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 5rem 2rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.spinner {
  width: 44px; height: 44px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.75s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.dots { display: inline-block; animation: dots 1.4s infinite; }
@keyframes dots {
  0%, 20%  { content: '.'; }
  40%      { content: '..'; }
  60%,100% { content: '...'; }
}

.loading-state.hidden { display: none; }

/* ===== PRODUCT GRID ===== */
.product-grid {
  max-width: 1280px;
  margin: 0 auto 2rem;
  padding: 0 2rem;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  gap: 1.25rem;
}

/* ===== PRODUCT CARD ===== */
.card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  cursor: pointer;
  transition: transform var(--speed) var(--ease),
              border-color var(--speed) var(--ease),
              box-shadow var(--speed) var(--ease);
  animation: fadeSlideUp 0.4s var(--ease) both;
}
.card:hover {
  transform: translateY(-6px);
  border-color: var(--accent);
  box-shadow: 0 12px 40px rgba(79,142,247,0.12), 0 4px 16px rgba(0,0,0,0.4);
}

@keyframes fadeSlideUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── Card Image ── */
.card-image {
  position: relative;
  height: 190px;
  background: var(--bg-elevated);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  flex-shrink: 0;
}

/* Subtle hover glow overlay */
.card-image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 50%, rgba(79,142,247,0.04), transparent 70%);
  transition: background var(--speed);
  pointer-events: none;
  z-index: 1;
}
.card:hover .card-image::after {
  background: radial-gradient(circle at 50% 50%, rgba(79,142,247,0.1), transparent 70%);
}

/* Real product image */
.card-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  padding: 1rem;
  transition: transform 0.35s var(--ease);
  position: relative;
  z-index: 0;
}
.card:hover .card-img { transform: scale(1.06); }

/* Emoji fallback (shown when no image) */
.card-emoji {
  position: relative;
  z-index: 1;
  font-size: 4.5rem;
  transition: transform 0.3s var(--ease);
  filter: drop-shadow(0 4px 12px rgba(0,0,0,0.5));
}
.card:hover .card-emoji { transform: scale(1.12); }

.card-badge {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  font-size: 0.65rem;
  font-weight: 700;
  padding: 0.25rem 0.6rem;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  z-index: 2;
}
.card-badge.hot  { background: rgba(248,113,113,0.2); color: var(--danger);  border: 1px solid rgba(248,113,113,0.4); }
.card-badge.new  { background: rgba(52,211,153,0.2);  color: var(--success); border: 1px solid rgba(52,211,153,0.4); }
.card-badge.sale { background: rgba(251,191,36,0.2);  color: var(--warning); border: 1px solid rgba(251,191,36,0.4); }

/* Card Body */
.card-body {
  padding: 1.1rem 1.25rem;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.card-category {
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 1.5px;
}

.card-name {
  font-family: 'Montserrat', sans-serif;
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.35;
}

.card-desc {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.6;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-rating {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.15rem;
}
.stars { color: var(--warning); font-size: 0.72rem; letter-spacing: 1px; }
.rating-num { font-size: 0.75rem; color: var(--text-muted); font-weight: 500; }

/* Card Footer */
.card-footer {
  padding: 0.9rem 1.25rem;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  background: rgba(255,255,255,0.015);
}

.card-price {
  font-family: 'Montserrat', sans-serif;
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.5px;
}
.card-price .currency {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-right: 1px;
}

.card-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.5rem 1.05rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-family: 'Poppins', sans-serif;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--speed) var(--ease);
  white-space: nowrap;
}
.card-btn:hover {
  background: var(--accent-hover);
  transform: scale(1.04);
  box-shadow: 0 4px 16px rgba(79,142,247,0.35);
}

/* ===== NO RESULTS ===== */
.no-results {
  max-width: 380px;
  margin: 4rem auto;
  text-align: center;
  padding: 2.5rem 2rem;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}
.no-results-icon { font-size: 3.5rem; margin-bottom: 1rem; }
.no-results h3 {
  font-family: 'Montserrat', sans-serif;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}
.no-results p { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.6; }
.no-results-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-top: 1.25rem;
  padding: 0.65rem 1.35rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-family: 'Poppins', sans-serif;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--speed) var(--ease);
}
.no-results-btn:hover { background: var(--accent-hover); transform: scale(1.03); }

.hidden { display: none !important; }

/* ===== FOOTER ===== */
.footer {
  text-align: center;
  padding: 2rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  margin-top: 2rem;
}
.footer strong { color: var(--text-secondary); }
.footer a { color: var(--accent); text-decoration: none; font-weight: 500; }
.footer a:hover { text-decoration: underline; }

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  .filters-row { gap: 0.85rem; }
  .filter-group { min-width: 140px; }
}

@media (max-width: 768px) {
  .header-inner { padding: 0.75rem 1.25rem; }
  .hero { padding: 2rem 1.25rem 1.5rem; }
  .controls-panel { padding: 0 1.25rem; }
  .product-grid { padding: 0 1.25rem; margin-bottom: 1.5rem; }
  .filters-row { flex-direction: column; padding: 1rem; }
  .filter-group { min-width: 100%; }
  .reset-btn { align-self: flex-start; }
}

@media (max-width: 520px) {
  .product-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 1.8rem; }
}

@media (min-width: 1400px) {
  .product-grid { grid-template-columns: repeat(4, 1fr); }
}