/* ==========================================================================
   VOLTRAX — VoltraSpec Hub
   Tech Spec Powerhouse archetype (nvidia.com/geforce style) applied to a
   multi-category electronics & gadget retailer.
   ========================================================================== */

:root {
  --primary: #6d5bff;
  --primary-light: #9d8dff;
  --secondary: #0d0f14;
  --accent: #baff29;
  --bg: #f5f6fb;
  --surface: #ffffff;
  --surface-alt: #eceefb;
  --border: #dcdfef;
  --text: #14151f;
  --text-muted: #565873;
  --success: #22c55e;
  --warning: #f59e0b;
  --danger: #ef4444;
  --info: #3b82f6;

  --dark-bg: #0a0b10;
  --dark-surface: #12141d;
  --dark-surface-alt: #171a26;
  --dark-border: #262a3c;
  --dark-text: #eef0ff;
  --dark-text-muted: #9599b8;

  --font-heading: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --shadow-glass: 0 8px 32px rgba(13, 15, 20, 0.12);
  --transition: 0.25s ease;
}

[data-theme="dark"] {
  --bg: var(--dark-bg);
  --surface: var(--dark-surface);
  --surface-alt: var(--dark-surface-alt);
  --border: var(--dark-border);
  --text: var(--dark-text);
  --text-muted: var(--dark-text-muted);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: var(--dark-bg);
    --surface: var(--dark-surface);
    --surface-alt: var(--dark-surface-alt);
    --border: var(--dark-border);
    --text: var(--dark-text);
    --text-muted: var(--dark-text-muted);
  }
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background var(--transition), color var(--transition);
}

img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }

.container { max-width: 1240px; margin: 0 auto; padding: 0 24px; }
.section { padding: 88px 0; }
.section-dark { background: var(--dark-bg); color: var(--dark-text); }
.section-dark .text-muted { color: var(--dark-text-muted); }

.section-head { max-width: 680px; margin-bottom: 48px; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 0.78rem; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--primary-light); margin-bottom: 12px;
}
.section-dark .eyebrow { color: var(--accent); }
.eyebrow i { font-size: 0.7rem; }
.section-title { font-family: var(--font-heading); font-size: clamp(1.8rem, 3vw, 2.6rem); font-weight: 700; margin-bottom: 12px; }
.section-desc { color: var(--text-muted); font-size: 1.02rem; max-width: 620px; }
.text-muted { color: var(--text-muted); }

/* Buttons — Glass style */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 14px 28px; border-radius: var(--radius-md); font-weight: 600; font-size: 0.95rem;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, var(--primary), #4b3bd6);
  color: #fff; box-shadow: 0 10px 30px rgba(109, 91, 255, 0.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 36px rgba(109, 91, 255, 0.45); }
.btn-accent { background: var(--accent); color: #0a0b10; }
.btn-accent:hover { transform: translateY(-2px); }
.btn-glass {
  background: rgba(255,255,255,0.08); backdrop-filter: blur(12px);
  border: 1px solid rgba(255,255,255,0.18); color: inherit;
}
.btn-glass:hover { background: rgba(255,255,255,0.16); transform: translateY(-2px); }
.btn-outline { border: 1.5px solid var(--border); color: var(--text); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.btn-sm { padding: 9px 16px; font-size: 0.85rem; }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* Navbar */
.navbar {
  position: sticky; top: 0; z-index: 500;
  background: rgba(10, 11, 16, 0.72); backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  color: #eef0ff;
  transition: padding var(--transition);
}
.navbar .container { display: flex; align-items: center; justify-content: space-between; padding-top: 14px; padding-bottom: 14px; }
.navbar.scrolled { padding-top: 0; }
.brand { display: flex; align-items: center; gap: 10px; font-family: var(--font-heading); font-weight: 700; font-size: 1.25rem; color: #fff; }
.brand .brand-mark {
  width: 34px; height: 34px; border-radius: 9px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex; align-items: center; justify-content: center; font-size: 0.95rem; color: #0a0b10; font-weight: 800;
}
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a { font-size: 0.92rem; font-weight: 500; color: rgba(255,255,255,0.78); transition: color var(--transition); }
.nav-links a:hover, .nav-links a.active { color: #fff; }
.nav-actions { display: flex; align-items: center; gap: 12px; }
.theme-toggle {
  width: 40px; height: 40px; border-radius: 50%; display: flex; align-items: center; justify-content: center;
  background: rgba(255,255,255,0.1); color: #fff; transition: background var(--transition);
}
.theme-toggle:hover { background: rgba(255,255,255,0.18); }
.nav-toggle { display: none; width: 40px; height: 40px; align-items: center; justify-content: center; color: #fff; font-size: 1.2rem; }

@media (max-width: 900px) {
  .nav-links { position: fixed; top: 0; right: -100%; height: 100vh; width: min(320px, 82vw);
    background: var(--dark-surface); flex-direction: column; justify-content: flex-start; padding: 100px 32px 32px;
    gap: 22px; transition: right var(--transition); z-index: 600; }
  .nav-links.open { right: 0; box-shadow: -12px 0 40px rgba(0,0,0,0.4); }
  .nav-toggle { display: flex; }
  .nav-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.5); z-index: 550; }
  .nav-overlay.open { display: block; }
}

/* Hero */
.hero {
  position: relative; background: radial-gradient(circle at 20% 20%, rgba(109,91,255,0.35), transparent 60%),
    radial-gradient(circle at 80% 70%, rgba(186,255,41,0.12), transparent 55%), var(--dark-bg);
  color: #eef0ff; padding: 120px 0 100px; overflow: hidden;
}
.hero-grid { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 48px; align-items: center; }
.hero-tag {
  display: inline-flex; align-items: center; gap: 8px; padding: 6px 14px; border-radius: 999px;
  background: rgba(186,255,41,0.12); color: var(--accent); font-size: 0.78rem; font-weight: 700;
  letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 20px;
}
.hero h1 { font-family: var(--font-heading); font-size: clamp(2.2rem, 5vw, 3.6rem); font-weight: 700; line-height: 1.08; margin-bottom: 18px; }
.hero h1 span { background: linear-gradient(135deg, var(--primary-light), var(--accent)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p { color: rgba(238,240,255,0.72); font-size: 1.08rem; max-width: 520px; margin-bottom: 32px; }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-visual { position: relative; display: flex; justify-content: center; }
.hero-visual img { filter: drop-shadow(0 30px 60px rgba(109, 91, 255, 0.35)); animation: float 6s ease-in-out infinite; }
@keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-16px); } }
.hero-stats { display: flex; gap: 28px; margin-top: 40px; flex-wrap: wrap; }
.hero-stat b { font-family: var(--font-heading); font-size: 1.6rem; display: block; color: #fff; }
.hero-stat span { font-size: 0.8rem; color: rgba(238,240,255,0.6); }

/* Feature Matrix */
.matrix-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.matrix-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-md);
  padding: 26px 20px; text-align: center; transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.matrix-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-glass); border-color: var(--primary); }
.matrix-icon {
  width: 54px; height: 54px; border-radius: 14px; margin: 0 auto 14px;
  display: flex; align-items: center; justify-content: center; font-size: 1.3rem;
  background: linear-gradient(135deg, rgba(109,91,255,0.16), rgba(186,255,41,0.12)); color: var(--primary);
}
.matrix-card h4 { font-family: var(--font-heading); font-size: 1rem; margin-bottom: 6px; }
.matrix-card p { font-size: 0.85rem; color: var(--text-muted); }

@media (max-width: 900px) { .matrix-grid { grid-template-columns: repeat(2, 1fr); } }

/* Deep dive */
.deepdive-list { display: flex; flex-direction: column; gap: 0; }
.deepdive-item { display: grid; grid-template-columns: 90px 1fr; gap: 28px; padding: 36px 0; border-bottom: 1px solid rgba(255,255,255,0.08); }
.deepdive-item:last-child { border-bottom: none; }
.deepdive-num { font-family: var(--font-heading); font-size: 2.6rem; font-weight: 700; color: var(--primary-light); opacity: 0.7; }
.deepdive-item h3 { font-family: var(--font-heading); font-size: 1.35rem; margin-bottom: 10px; }
.deepdive-item p { color: var(--dark-text-muted); max-width: 640px; }
.deepdive-tags { display: flex; gap: 8px; margin-top: 14px; flex-wrap: wrap; }
.deepdive-tags span { font-size: 0.75rem; padding: 5px 12px; border-radius: 999px; background: rgba(109,91,255,0.16); color: var(--primary-light); }

/* Performance tabs */
.tab-bar { display: flex; gap: 10px; margin-bottom: 32px; flex-wrap: wrap; }
.tab-btn {
  padding: 11px 22px; border-radius: 999px; font-weight: 600; font-size: 0.9rem;
  background: var(--surface-alt); color: var(--text-muted); border: 1px solid var(--border);
  transition: all var(--transition);
}
.tab-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.perf-panel { display: none; }
.perf-panel.active { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.perf-list { display: flex; flex-direction: column; gap: 14px; }
.perf-row { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 16px 18px; display: flex; justify-content: space-between; align-items: center; }
.perf-row b { font-family: var(--font-heading); }
.perf-row span { font-size: 0.82rem; color: var(--text-muted); }
.chart-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-md); padding: 24px; }
.chart-row { margin-bottom: 18px; }
.chart-row-head { display: flex; justify-content: space-between; font-size: 0.85rem; margin-bottom: 6px; }
.chart-track { height: 10px; border-radius: 6px; background: var(--surface-alt); overflow: hidden; }
.chart-fill { height: 100%; border-radius: 6px; background: linear-gradient(90deg, var(--primary), var(--accent)); width: 0; transition: width 1s cubic-bezier(0.16,1,0.3,1); }

@media (max-width: 800px) { .perf-panel.active { grid-template-columns: 1fr; } }

/* Before/after slider */
.compare-wrap { max-width: 760px; margin: 0 auto; position: relative; border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-glass); user-select: none; }
.compare-wrap img { width: 100%; display: block; }
.compare-before { position: relative; }
.compare-after { position: absolute; inset: 0; overflow: hidden; clip-path: inset(0 50% 0 0); }
.compare-after img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.compare-handle {
  position: absolute; top: 0; bottom: 0; left: 50%; width: 3px; background: var(--accent);
  cursor: ew-resize; transform: translateX(-50%);
}
.compare-handle::after {
  content: '\f337'; font-family: 'Font Awesome 6 Free'; font-weight: 900;
  position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
  width: 44px; height: 44px; border-radius: 50%; background: var(--accent); color: #0a0b10;
  display: flex; align-items: center; justify-content: center; font-size: 1.1rem;
  box-shadow: 0 6px 18px rgba(0,0,0,0.35);
}
.compare-label { position: absolute; top: 16px; padding: 6px 14px; border-radius: 999px; font-size: 0.75rem; font-weight: 700; background: rgba(0,0,0,0.6); color: #fff; }
.compare-label.left { left: 16px; }
.compare-label.right { right: 16px; }

/* Device comparison tool */
.compare-tool { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 32px; box-shadow: var(--shadow-glass); }
.compare-picker { display: grid; grid-template-columns: 1fr auto 1fr; gap: 24px; align-items: start; margin-bottom: 32px; }
.compare-vs { display: flex; align-items: center; justify-content: center; width: 46px; height: 46px; border-radius: 50%; background: var(--primary); color: #fff; font-family: var(--font-heading); font-weight: 700; margin-top: 34px; }
.picker-select { width: 100%; padding: 12px 14px; border-radius: var(--radius-sm); border: 1px solid var(--border); background: var(--surface-alt); color: var(--text); font-size: 0.92rem; margin-bottom: 16px; }
.picker-card { background: var(--surface-alt); border-radius: var(--radius-md); padding: 18px; text-align: center; }
.picker-card img { width: 88px; margin: 0 auto 10px; }
.picker-card h5 { font-family: var(--font-heading); font-size: 1rem; }
.picker-card span { font-size: 0.8rem; color: var(--text-muted); }
.compare-table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
.compare-table th, .compare-table td { padding: 12px 14px; border-bottom: 1px solid var(--border); text-align: center; }
.compare-table th:first-child, .compare-table td:first-child { text-align: left; color: var(--text-muted); font-weight: 600; }
.compare-table td.win { color: var(--success); font-weight: 700; }
@media (max-width: 760px) { .compare-picker { grid-template-columns: 1fr; } .compare-vs { margin: 0 auto; } }

/* Spec table */
.table-wrap { overflow-x: auto; border-radius: var(--radius-md); border: 1px solid var(--border); }
.spec-table { width: 100%; border-collapse: collapse; min-width: 760px; background: var(--surface); }
.spec-table th, .spec-table td { padding: 14px 18px; text-align: left; font-size: 0.88rem; border-bottom: 1px solid var(--border); white-space: nowrap; }
.spec-table thead th { background: var(--surface-alt); font-family: var(--font-heading); cursor: pointer; user-select: none; position: sticky; top: 0; }
.spec-table thead th i { margin-left: 6px; font-size: 0.7rem; opacity: 0.5; }
.spec-table thead th.sort-asc i::before { content: '\f0de'; opacity: 1; }
.spec-table thead th.sort-desc i::before { content: '\f0dd'; opacity: 1; }
.spec-table tbody tr:hover { background: var(--surface-alt); }
.badge-cat { display: inline-block; padding: 3px 10px; border-radius: 999px; font-size: 0.72rem; font-weight: 700; background: rgba(109,91,255,0.12); color: var(--primary); }

/* SKU grid (variant cards) */
.sku-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.sku-card { background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.1); border-radius: var(--radius-lg); padding: 24px; text-align: center; backdrop-filter: blur(10px); transition: transform var(--transition); }
.sku-card:hover { transform: translateY(-6px); }
.sku-swatch { width: 46px; height: 46px; border-radius: 50%; margin: 0 auto 14px; border: 3px solid rgba(255,255,255,0.2); }
.sku-code { font-size: 0.72rem; color: var(--accent); font-weight: 700; letter-spacing: 0.06em; margin-bottom: 6px; }
.sku-card h4 { font-family: var(--font-heading); margin-bottom: 4px; }
.sku-card p { font-size: 0.82rem; color: rgba(238,240,255,0.6); margin-bottom: 14px; }
.sku-price { font-family: var(--font-heading); font-size: 1.3rem; color: #fff; margin-bottom: 14px; }
@media (max-width: 900px) { .sku-grid { grid-template-columns: repeat(2, 1fr); } }

/* Product categories */
.cat-tabs { display: flex; gap: 10px; margin-bottom: 28px; flex-wrap: wrap; }
.product-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.product-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-md);
  overflow: hidden; cursor: pointer; transition: transform var(--transition), box-shadow var(--transition);
}
.product-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-glass); }
.product-thumb { aspect-ratio: 4/3; background: var(--surface-alt); display: flex; align-items: center; justify-content: center; padding: 18px; }
.product-body { padding: 16px; }
.product-cat-tag { font-size: 0.7rem; color: var(--primary); font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; }
.product-card h4 { font-family: var(--font-heading); font-size: 1rem; margin: 6px 0; }
.product-price { font-weight: 700; color: var(--text); }
.product-old-price { font-size: 0.8rem; color: var(--text-muted); text-decoration: line-through; margin-left: 6px; }
@media (max-width: 1000px) { .product-grid { grid-template-columns: repeat(2, 1fr); } }

/* Stat counter */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.stat-item b { font-family: var(--font-heading); font-size: 2.4rem; display: block; color: var(--accent); }
.stat-item span { color: rgba(238,240,255,0.65); font-size: 0.88rem; }
@media (max-width: 700px) { .stats-grid { grid-template-columns: repeat(2, 1fr); } }

/* About */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.about-points { display: flex; flex-direction: column; gap: 16px; margin-top: 20px; }
.about-point { display: flex; gap: 14px; align-items: flex-start; }
.about-point i { color: var(--primary); font-size: 1.1rem; margin-top: 3px; }
@media (max-width: 900px) { .about-grid { grid-template-columns: 1fr; } }

/* Gallery */
.gallery-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.gallery-item { border-radius: var(--radius-md); overflow: hidden; cursor: pointer; position: relative; }
.gallery-item img { transition: transform 0.4s ease; width: 100%; height: 100%; object-fit: cover; }
.gallery-item:hover img { transform: scale(1.08); }
@media (max-width: 800px) { .gallery-grid { grid-template-columns: repeat(2, 1fr); } }

/* Articles */
.article-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.article-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-md); overflow: hidden; cursor: pointer; transition: transform var(--transition); }
.article-card:hover { transform: translateY(-6px); }
.article-thumb { aspect-ratio: 16/9; background: var(--surface-alt); }
.article-body { padding: 18px; }
.article-tag { font-size: 0.72rem; color: var(--primary); font-weight: 700; text-transform: uppercase; }
.article-card h4 { font-family: var(--font-heading); margin: 8px 0; font-size: 1.02rem; }
@media (max-width: 900px) { .article-grid { grid-template-columns: 1fr; } }

/* Testimonials */
.testi-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.testi-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-md); padding: 24px; }
.testi-stars { color: var(--warning); margin-bottom: 12px; }
.testi-person { display: flex; align-items: center; gap: 12px; margin-top: 16px; }
.testi-avatar { width: 42px; height: 42px; border-radius: 50%; background: var(--primary); color: #fff; display: flex; align-items: center; justify-content: center; font-family: var(--font-heading); font-weight: 700; }
@media (max-width: 900px) { .testi-grid { grid-template-columns: 1fr; } }

/* FAQ */
.faq-item { border: 1px solid var(--border); border-radius: var(--radius-sm); margin-bottom: 12px; overflow: hidden; background: var(--surface); }
.faq-q { padding: 18px 22px; display: flex; justify-content: space-between; align-items: center; font-weight: 600; }
.faq-q i { transition: transform var(--transition); }
.faq-item.open .faq-q i { transform: rotate(180deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height var(--transition); }
.faq-a-inner { padding: 0 22px 18px; color: var(--text-muted); }

/* Contact */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.contact-info-item { display: flex; gap: 14px; margin-bottom: 20px; }
.contact-info-item i { width: 42px; height: 42px; border-radius: 12px; background: var(--surface-alt); display: flex; align-items: center; justify-content: center; color: var(--primary); flex-shrink: 0; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 0.85rem; font-weight: 600; margin-bottom: 6px; }
.form-control {
  width: 100%; padding: 12px 14px; border-radius: var(--radius-sm); border: 1px solid var(--border);
  background: var(--surface); color: var(--text); font-family: inherit; font-size: 0.92rem;
}
.form-control:focus { outline: 2px solid var(--primary); border-color: transparent; }
@media (max-width: 900px) { .contact-grid { grid-template-columns: 1fr; } }

/* Footer */
.footer { background: var(--dark-bg); color: rgba(238,240,255,0.7); padding: 64px 0 24px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 32px; margin-bottom: 40px; }
.footer-col h5 { color: #fff; font-family: var(--font-heading); margin-bottom: 16px; }
.footer-col ul li { margin-bottom: 10px; font-size: 0.9rem; }
.footer-col ul li a:hover { color: var(--accent); }
.footer-social { display: flex; gap: 10px; margin-top: 18px; }
.footer-social a { width: 38px; height: 38px; border-radius: 50%; background: rgba(255,255,255,0.08); display: flex; align-items: center; justify-content: center; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding-top: 20px; text-align: center; font-size: 0.82rem; }
@media (max-width: 900px) { .footer-grid { grid-template-columns: 1fr 1fr; } }

/* Floating buttons */
.float-btn {
  position: fixed; bottom: 24px; width: 54px; height: 54px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center; font-size: 1.3rem; z-index: 400;
  box-shadow: 0 8px 24px rgba(0,0,0,0.3); transition: transform var(--transition), opacity var(--transition);
}
.whatsapp-float { right: 24px; background: #25d366; color: #fff; animation: pulse 2.4s infinite; }
@keyframes pulse { 0% { box-shadow: 0 0 0 0 rgba(37,211,102,0.5); } 70% { box-shadow: 0 0 0 14px rgba(37,211,102,0); } 100% { box-shadow: 0 0 0 0 rgba(37,211,102,0); } }
.back-to-top { right: 24px; bottom: 88px; background: var(--primary); color: #fff; opacity: 0; pointer-events: none; }
.back-to-top.show { opacity: 1; pointer-events: auto; }

/* Modal */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(5,6,10,0.7); backdrop-filter: blur(4px);
  display: flex; align-items: center; justify-content: center; z-index: 900; opacity: 0; pointer-events: none; transition: opacity var(--transition); padding: 20px;
}
.modal-overlay.open { opacity: 1; pointer-events: auto; }
.modal-box {
  background: var(--surface); border-radius: var(--radius-lg); max-width: 640px; width: 100%;
  max-height: 86vh; overflow-y: auto; padding: 32px; position: relative; transform: translateY(20px); transition: transform var(--transition);
}
.modal-overlay.open .modal-box { transform: translateY(0); }
.modal-close { position: absolute; top: 18px; right: 18px; width: 36px; height: 36px; border-radius: 50%; background: var(--surface-alt); display: flex; align-items: center; justify-content: center; }
.modal-spec-row { display: flex; justify-content: space-between; padding: 10px 0; border-bottom: 1px solid var(--border); font-size: 0.9rem; }
.modal-spec-row span:first-child { color: var(--text-muted); }

/* Toast */
.toast-container { position: fixed; bottom: 24px; left: 24px; z-index: 1000; display: flex; flex-direction: column; gap: 10px; }
.toast {
  background: var(--dark-surface); color: #fff; padding: 14px 20px; border-radius: var(--radius-sm);
  display: flex; align-items: center; gap: 10px; box-shadow: 0 8px 24px rgba(0,0,0,0.3);
  transform: translateX(-120%); transition: transform 0.3s ease; font-size: 0.88rem; max-width: 320px;
}
.toast.show { transform: translateX(0); }
.toast i { color: var(--accent); }

/* Reveal */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* Skeleton */
.skeleton { background: linear-gradient(90deg, var(--surface-alt) 25%, var(--border) 50%, var(--surface-alt) 75%); background-size: 200% 100%; animation: shimmer 1.4s infinite; border-radius: var(--radius-sm); }
@keyframes shimmer { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; text-align: center; }
  .hero p { margin-left: auto; margin-right: auto; }
  .hero-cta { justify-content: center; }
  .hero-stats { justify-content: center; }
  .stats-grid, .sku-grid, .product-grid { grid-template-columns: repeat(2, 1fr); }
  .article-grid, .gallery-grid, .testi-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
}