/* ==========================================================
   POWER7OIL — LEAD UI/UX DESIGN SYSTEM & STYLESHEET
   Industry: High-Performance Industrial & Automotive Lubricants
   Palette: Carbon Black, Pure White, Flame Red & Crisp Slate
   ========================================================== */

/* 1. IMPORTS & DESIGN TOKENS */
@import url("https://fonts.googleapis.com/css2?family=Montserrat:ital,wght@0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,400;1,700;1,800;1,900&display=swap");

:root {
  /* Color System */
  --color-bg: #ffffff;
  --color-light-gray: #f6f8fa;
  --color-dark: #111111;
  --color-dark-surface: #181818;
  --color-dark-light: #222222;
  --color-accent: #E4141B;
  --color-accent-hover: #B00F14;
  --color-accent-glow: rgba(228, 20, 27, 0.28);
  --color-text: #47516b;
  --color-text-muted: #828c9f;
  --color-border: #e8ecf1;
  --color-border-dark: rgba(255, 255, 255, 0.1);

  /* Typography */
  --font-serif: "Montserrat", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-sans: "Montserrat", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  /* Spacing & Radii */
  --spacing-section: 120px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-pill: 9999px;

  /* Transitions & Shadows */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.35s cubic-bezier(0.165, 0.84, 0.44, 1);
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 20px 45px rgba(0, 0, 0, 0.12);
  --shadow-accent: 0 12px 28px rgba(228, 20, 27, 0.35);
}

/* 2. GLOBAL RESET & BASE */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-weight: 400;
  line-height: 1.75;
  overflow-x: hidden;
  margin: 0;
  padding: 0;
}

::selection {
  background-color: var(--color-accent);
  color: #ffffff;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 9px;
}
::-webkit-scrollbar-track {
  background: #181818;
}
::-webkit-scrollbar-thumb {
  background: #333333;
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-accent);
}

a {
  text-decoration: none;
  transition: var(--transition-normal);
}

img {
  max-width: 100%;
  height: auto;
}

/* Typography Hierarchy */
h1, h2, h3, h4, h5, h6,
.display-1, .display-2, .display-3, .display-4, .display-5, .display-title {
  font-family: var(--font-serif);
  color: var(--color-dark);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.display-1 { font-size: clamp(1.85rem, 6.5vw, 4.5rem); font-style: italic; word-break: break-word; overflow-wrap: break-word; }
.display-2 { font-size: clamp(1.65rem, 5.5vw, 3.5rem); font-style: italic; word-break: break-word; overflow-wrap: break-word; }
.display-3 { font-size: clamp(1.45rem, 4.8vw, 3rem); font-style: italic; word-break: break-word; overflow-wrap: break-word; }
.display-title { font-size: clamp(1.4rem, 4.2vw, 2.75rem); color: var(--color-dark); word-break: break-word; overflow-wrap: break-word; }

.subheading {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--color-accent);
  display: inline-block;
  margin-bottom: 0.75rem;
}

/* 3. UTILITIES & HELPERS */
.text-accent { color: var(--color-accent) !important; }
.bg-accent { background-color: var(--color-accent) !important; }
.bg-dark { background-color: var(--color-dark-surface) !important; }
.bg-light-gray { background-color: var(--color-light-gray) !important; }
.section-padding { padding: var(--spacing-section) 0; }

.link-accent {
  font-size: 0.82rem;
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--color-accent);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition-fast);
}
.link-accent:hover {
  color: var(--color-accent-hover);
  transform: translateX(4px);
}

/* Glassmorphism Panel */
.glass-panel {
  background: rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-lg);
}

.glass-panel-light {
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid rgba(0, 0, 0, 0.06);
  border-radius: var(--radius-lg);
}

/* 4. BUTTONS & CTAs */
.btn-luxe {
  background-color: var(--color-accent);
  color: #ffffff !important;
  padding: 15px 36px;
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-pill);
  transition: var(--transition-normal);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 15px rgba(228, 20, 27, 0.25);
  cursor: pointer;
  text-decoration: none;
}
.btn-luxe:hover, .btn-luxe:focus-visible {
  background-color: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  color: #ffffff !important;
  transform: translateY(-2px);
  box-shadow: var(--shadow-accent);
}
.btn-luxe:active {
  transform: translateY(0);
  box-shadow: 0 4px 12px rgba(228, 20, 27, 0.3);
}

.btn-luxe-outline {
  background: rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(8px);
  color: #ffffff !important;
  padding: 15px 34px;
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: var(--radius-pill);
  transition: var(--transition-normal);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  text-decoration: none;
}
.btn-luxe-outline:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: #ffffff;
  color: #ffffff !important;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}

.btn-accent {
  background-color: var(--color-accent);
  color: #ffffff !important;
  padding: 15px 36px;
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-pill);
  transition: var(--transition-normal);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  cursor: pointer;
  box-shadow: 0 4px 15px rgba(228, 20, 27, 0.25);
}
.btn-accent:hover {
  background-color: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  color: #ffffff !important;
  transform: translateY(-2px);
  box-shadow: var(--shadow-accent);
}

/* 5. NAVBAR */
.navbar {
  padding: 14px 0;
  transition: background-color 0.3s ease, padding 0.3s ease, box-shadow 0.3s ease;
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}
.navbar-brand img {
  max-width: 155px;
  height: auto;
  transition: transform var(--transition-fast);
}
.navbar-brand:hover img {
  transform: scale(1.02);
}

.nav-link {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-dark) !important;
  margin: 0 6px;
  font-weight: 700;
  position: relative;
  padding: 6px 10px !important;
  transition: color var(--transition-fast);
}
.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background-color: var(--color-accent);
  transition: width 0.3s ease, left 0.3s ease;
  border-radius: 2px;
}
.nav-link:hover::after,
.nav-link.active::after {
  width: 70%;
  left: 15%;
}
.nav-link:hover,
.nav-link.active {
  color: var(--color-accent) !important;
}

/* 6. HERO SECTION TRUST CHIPS & ENHANCEMENTS */
.hero-trust-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.14);
  padding: 7px 16px;
  border-radius: var(--radius-pill);
  font-size: 0.78rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.9);
  transition: var(--transition-fast);
}
.hero-trust-chip i {
  color: var(--color-accent);
  font-size: 0.85rem;
}
.hero-trust-chip:hover {
  background: rgba(255, 255, 255, 0.14);
  border-color: rgba(255, 255, 255, 0.25);
  transform: translateY(-2px);
}

/* 7. MARQUEE TICKER */
.marquee-section {
  background: #111111;
  border-top: 1px solid rgba(228, 20, 27, 0.4);
  border-bottom: 1px solid rgba(228, 20, 27, 0.4);
}
.marquee-track {
  display: flex;
  white-space: nowrap;
  overflow: hidden;
}
.marquee-content {
  display: flex;
  align-items: center;
  animation: scroll 32s linear infinite;
  padding-left: 0;
}
.marquee-item {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #ffffff;
  padding: 0 32px;
}
.separator {
  color: var(--color-accent);
  font-size: 0.85rem;
  opacity: 0.85;
}
@keyframes scroll {
  0% { transform: translateX(0); }
  100% { transform: translateX(-100%); }
}
.marquee-track:hover .marquee-content {
  animation-play-state: paused;
}

/* 8. FEATURED & PRODUCT CARDS */
.class-card {
  background: #ffffff;
  padding: 40px 32px;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-normal);
  height: 100%;
  border-radius: var(--radius-lg);
  position: relative;
  overflow: hidden;
  z-index: 1;
  display: flex;
  flex-direction: column;
}

.class-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: transparent;
  transition: background var(--transition-fast);
}

.class-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(228, 20, 27, 0.3);
}
.class-card:hover::before {
  background: var(--color-accent);
}

.card-num {
  font-family: var(--font-serif);
  font-size: 3.2rem;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 12px;
  font-weight: 800;
  letter-spacing: -0.04em;
}

.card-bg-img {
  position: absolute;
  bottom: -35px;
  right: -35px;
  height: 240px;
  opacity: 0.18;
  z-index: 1;
  filter: drop-shadow(0 15px 30px rgba(0,0,0,0.15)) grayscale(100%);
  transition: all 0.6s cubic-bezier(0.165, 0.84, 0.44, 1);
  pointer-events: none;
}

.class-card:hover .card-bg-img {
  opacity: 0.45;
  right: -15px;
  bottom: -15px;
  filter: drop-shadow(0 20px 40px rgba(0,0,0,0.25)) grayscale(0%);
  transform: scale(1.05) rotate(-2deg);
}

.product-preview-wrap {
  transition: var(--transition-normal);
}
.class-card:hover .product-preview-wrap {
  border-color: rgba(228, 20, 27, 0.25) !important;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.05);
}
.class-card:hover .product-catalog-img {
  transform: translateY(-4px) scale(1.04);
}

/* Category Badge & Spec Pills */
.badge-category {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-accent);
  background: rgba(228, 20, 27, 0.08);
  border: 1px solid rgba(228, 20, 27, 0.15);
  border-radius: var(--radius-pill);
  padding: 4px 12px;
  margin-bottom: 14px;
}

.spec-pill {
  font-size: 0.72rem;
  font-weight: 600;
  background: var(--color-light-gray);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  padding: 3px 10px;
}

/* Category Filter Buttons */
.category-filter-wrapper {
  position: relative;
}
.filter-btn {
  background: #ffffff;
  color: var(--color-text);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  border: 1px solid var(--color-border);
  padding: 10px 22px;
  border-radius: var(--radius-pill);
  transition: all 0.25s ease;
  box-shadow: 0 2px 6px rgba(0,0,0,0.03);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  user-select: none;
}
.filter-btn:hover {
  background: var(--color-light-gray);
  color: var(--color-dark);
  border-color: #cbd3df;
}
.filter-btn.active {
  background: var(--color-dark);
  color: #ffffff;
  border-color: var(--color-dark);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.18);
}
.filter-count {
  font-size: 0.7rem;
  background: rgba(0, 0, 0, 0.08);
  color: var(--color-text);
  padding: 2px 8px;
  border-radius: 20px;
  font-weight: 700;
  transition: all 0.25s ease;
}
.filter-btn.active .filter-count {
  background: rgba(255, 255, 255, 0.2);
  color: #ffffff;
}

/* Product Spec Box inside Catalog Cards */
.product-spec-box {
  border-radius: var(--radius-md);
  padding: 14px 18px;
  margin-bottom: 20px;
  background: #f8fafc;
  border: 1px solid #eef0f5;
}

/* 9. PRODUCT DETAIL PAGE — SERIES CARDS */
.product-detail-main {
  padding: 7rem 0 3rem;
  background: #f4f5f7;
  min-height: 80vh;
}

.series-card {
  background: #ffffff;
  border-radius: var(--radius-lg);
  margin-bottom: 28px;
  padding: 32px;
  position: relative;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: var(--transition-normal);
  overflow: hidden;
}
.series-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
  border-color: rgba(228, 20, 27, 0.25);
}
.series-card-accent {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--color-accent);
}

.series-img-wrap {
  background: var(--color-light-gray);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  border: 1px solid var(--color-border);
  box-shadow: inset 0 2px 6px rgba(0,0,0,0.02);
}
.series-img {
  max-height: 220px;
  max-width: 100%;
  object-fit: contain;
  mix-blend-mode: multiply;
  transition: transform var(--transition-normal);
}
.series-card:hover .series-img {
  transform: scale(1.05);
}

.series-name-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
  flex-wrap: wrap;
}
.series-accent-dot {
  width: 8px;
  height: 8px;
  background: var(--color-accent);
  border-radius: 50%;
  flex-shrink: 0;
}
.series-name {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 900;
  font-size: clamp(1.4rem, 2.5vw, 2rem);
  text-transform: uppercase;
  color: var(--color-dark);
  line-height: 1.1;
  margin: 0;
}
.series-grade-pill {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  background: var(--color-light-gray);
  color: var(--color-text);
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border);
  margin-left: auto;
}
.series-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-pill);
  padding: 3px 14px;
  margin-bottom: 14px;
}
.series-desc {
  color: var(--color-text);
  font-size: 0.95rem;
  line-height: 1.75;
  margin-bottom: 16px;
}

/* Stats bar on product detail */
.stats-bar {
  display: flex;
  gap: 16px;
  margin-bottom: 30px;
  flex-wrap: wrap;
}
.stat-chip {
  display: flex;
  align-items: center;
  gap: 12px;
  background: #ffffff;
  border: 1px solid var(--color-border);
  padding: 12px 20px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}
.stat-chip i {
  font-size: 1.5rem;
  color: var(--color-accent);
}
.stat-chip .num {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--color-dark);
  line-height: 1;
}
.stat-chip .label {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.breadcrumb-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}
.breadcrumb-custom {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  font-weight: 600;
}
.breadcrumb-custom a {
  color: var(--color-text-muted);
}
.breadcrumb-custom a:hover {
  color: var(--color-accent);
}
.breadcrumb-custom .sep {
  color: #cbd3df;
}

.product-hero {
  background: linear-gradient(135deg, #181818, #111111);
  color: #ffffff;
  padding: 36px 32px;
  border-radius: var(--radius-lg);
  margin-bottom: 24px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  position: relative;
  overflow: hidden;
}
.product-hero::before {
  content: "";
  position: absolute;
  top: -60%;
  right: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(228, 20, 27, 0.12) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}
.product-hero h1 {
  color: #ffffff;
  font-size: clamp(1.4rem, 3vw, 2.2rem);
  font-style: italic;
  font-weight: 800;
  margin-bottom: 12px;
  position: relative;
  z-index: 1;
}
.product-hero p {
  color: rgba(255, 255, 255, 0.75);
  font-size: 0.95rem;
  line-height: 1.65;
  max-width: 800px;
  margin-bottom: 0;
  position: relative;
  z-index: 1;
}

/* 10. LUXURY FORM UX */
.form-section {
  background-color: var(--color-bg);
}
.form-control-luxe {
  background: #ffffff;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  font-family: var(--font-sans);
  color: var(--color-dark);
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition-fast);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.02);
}
.form-control-luxe:focus {
  background: #ffffff;
  box-shadow: 0 0 0 4px var(--color-accent-glow);
  border-color: var(--color-accent);
  color: var(--color-dark);
  outline: none;
}
.form-control-luxe::placeholder {
  color: #9aa3b4;
  font-size: 0.85rem;
  font-weight: 500;
}
.form-select-luxe {
  background-color: #ffffff;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  color: #555e75;
  font-size: 0.9rem;
  font-weight: 600;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.02);
  transition: var(--transition-fast);
}
.form-select-luxe:focus {
  box-shadow: 0 0 0 4px var(--color-accent-glow);
  border-color: var(--color-accent);
  outline: none;
}
.form-control-luxe.is-invalid,
.form-select-luxe.is-invalid {
  border-color: #dc3545 !important;
  background-image: none !important;
}
.invalid-feedback {
  font-size: 0.78rem;
  font-weight: 600;
  color: #dc3545;
  margin-top: 6px;
}

/* 11. FOOTER */
footer {
  background-color: #111111;
  color: rgba(255, 255, 255, 0.7);
  padding-top: 90px;
  padding-bottom: 40px;
  font-size: 0.9rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}
footer h3 {
  margin-bottom: 20px !important;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  color: #ffffff;
}
footer ul li {
  margin-bottom: 10px;
}
footer a {
  color: rgba(255, 255, 255, 0.6);
  transition: color var(--transition-fast);
}
footer a:hover {
  color: var(--color-accent);
}

/* 12. ANIMATIONS & MICROINTERACTIONS */
@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes pulse-subtle {
  0%, 100% { opacity: 0.9; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.03); }
}

[data-hover="lift"] {
  transition: var(--transition-normal);
}
[data-hover="lift"]:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

[data-hover="zoom"] {
  transition: transform 0.6s cubic-bezier(0.165, 0.84, 0.44, 1);
}
[data-hover="zoom"]:hover {
  transform: scale(1.04);
}

/* 13. SERIES & SPEC COMPONENT STYLES */
.series-btn-primary {
  background: var(--color-accent);
  color: #ffffff !important;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 11px 22px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-accent);
  transition: var(--transition-normal);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  box-shadow: 0 4px 12px rgba(228, 20, 27, 0.25);
  text-decoration: none;
}
.series-btn-primary:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  color: #ffffff !important;
  transform: translateY(-2px);
  box-shadow: var(--shadow-accent);
}

.series-btn-pdf {
  background: #f8fafc;
  color: #1a202c !important;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 10px 18px;
  border-radius: var(--radius-pill);
  border: 1px solid #e2e8f0;
  transition: var(--transition-fast);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  text-decoration: none;
  text-align: center;
}
.series-btn-pdf:hover {
  background: #ffffff;
  border-color: var(--color-accent);
  color: var(--color-accent) !important;
  box-shadow: 0 4px 12px rgba(228, 20, 27, 0.12);
  transform: translateY(-1px);
}

.series-collapse-inner {
  padding-top: 24px;
  margin-top: 24px;
  border-top: 1px solid #eef0f5;
}

.series-spec-preview {
  background: #f8fafc;
  border-radius: var(--radius-md);
  padding: 14px 18px;
  margin-bottom: 18px;
  border: 1px solid #edf2f7;
}
.series-spec-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  padding: 6px 0;
  gap: 12px;
}
.series-spec-row:not(:last-child) {
  border-bottom: 1px dashed #e2e8f0;
}
.spec-label {
  color: #64748b;
  font-weight: 500;
  word-break: break-word;
}
.spec-values {
  color: #0f172a;
  font-weight: 700;
  text-align: right;
  white-space: nowrap;
}
.spec-sep {
  color: #cbd5e1;
  margin: 0 4px;
}

/* Table and Technical Properties */
.table-container {
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid #eef0f5;
  background: #ffffff;
}
.table thead th {
  background: #181818;
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 700;
  border: none;
  padding: 12px 16px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.table thead th:not(:last-child) {
  border-right: 1px solid rgba(255, 255, 255, 0.08);
}
.table td {
  font-size: 0.82rem;
  padding: 11px 16px;
  vertical-align: middle;
  border-bottom: 1px solid #f1f3f6;
}
.table td:first-child {
  font-weight: 600;
  color: #111111;
}
.table-striped > tbody > tr:nth-of-type(odd) > * {
  background-color: #fafbfd;
}
.table tbody tr:last-child td {
  border-bottom: none;
}

.section-title {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: #111111;
}
.section-title .count {
  font-size: 0.68rem;
  background: #eef0f5;
  color: #64748b;
  padding: 3px 10px;
  border-radius: 20px;
  font-weight: 600;
}

.info-grid {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.info-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 14px 18px;
  background: #f8fafc;
  border-radius: 10px;
  border: 1px solid #eef0f5;
  border-left-width: 3px;
  border-left-color: var(--color-accent);
  transition: background 0.2s;
}
.info-item:hover {
  background: #ffffff;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}
.info-item .icon-wrap {
  width: 36px;
  height: 36px;
  background: #ffffff;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
  border: 1px solid #eef0f5;
}
.info-item .icon-wrap i {
  color: var(--color-accent);
  font-size: 0.9rem;
}
.info-item .info-content {
  flex: 1;
  min-width: 0;
}
.info-item .info-label {
  font-size: 0.72rem;
  font-weight: 700;
  color: #8892a4;
  text-transform: uppercase;
  margin-bottom: 3px;
}
.info-item .info-value {
  font-size: 0.85rem;
  color: #334155;
  line-height: 1.5;
}
.disclaimer {
  text-align: center;
  font-size: 0.75rem;
  color: #94a3b8;
  padding: 1.5rem 0 0;
  border-top: 1px solid #e2e8f0;
  margin-top: 2rem;
}

/* 14. RESPONSIVE OPTIMIZATIONS & MOBILE AUDIT FIXES */
@media (max-width: 991px) {
  :root {
    --spacing-section: 70px;
  }
  .navbar-collapse {
    background: #ffffff;
    padding: 20px;
    border-radius: var(--radius-md);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.12);
    margin-top: 12px;
    border: 1px solid var(--color-border);
  }
  .nav-link {
    padding: 10px 12px !important;
    font-size: 0.85rem;
    border-radius: var(--radius-sm);
  }
  .nav-link:hover, .nav-link.active {
    background: #f8fafc;
  }
  .nav-link::after {
    display: none;
  }
  .btn-luxe, .btn-luxe-outline, .btn-accent {
    padding: 13px 24px;
    font-size: 0.78rem;
  }
}

@media (max-width: 767px) {
  :root {
    --spacing-section: 55px;
  }

  /* Prevent iOS input auto-zoom by ensuring >= 16px */
  .form-control-luxe,
  .form-select-luxe,
  input.form-control,
  select.form-select,
  textarea.form-control {
    font-size: 16px !important;
    padding: 14px 16px;
  }

  .section-padding {
    padding: var(--spacing-section) 0;
  }

  /* Hero adjustments */
  .hero-trust-chip {
    width: 100%;
    justify-content: flex-start;
    padding: 9px 16px;
    font-size: 0.8rem;
  }

  .btn-luxe, .btn-luxe-outline, .btn-accent {
    width: 100%;
    text-align: center;
    justify-content: center;
    padding: 14px 20px;
  }

  /* Main & Section Padding */
  .product-detail-main {
    padding: 5.5rem 0 2rem;
  }
  .hero-catalog-section {
    padding: 100px 0 45px !important;
  }
  .catalog-grid-section {
    padding: 35px 0 60px !important;
  }

  /* Stats Bar on Mobile */
  .stats-bar {
    display: grid !important;
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 10px !important;
    margin-bottom: 1.25rem;
  }
  .stat-chip {
    padding: 10px 12px;
    gap: 8px;
    margin: 0;
  }
  .stat-chip i {
    font-size: 1.25rem;
  }
  .stat-chip .num {
    font-size: 1.05rem;
  }
  .stat-chip .label {
    font-size: 0.65rem;
  }

  /* Product Catalog Filter Scroll */
  #productFilter {
    display: flex;
    flex-wrap: nowrap !important;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding: 4px 4px 10px 4px;
    margin-bottom: 1.25rem !important;
    scrollbar-width: none;
    gap: 8px;
  }
  #productFilter::-webkit-scrollbar {
    display: none;
  }
  .filter-btn {
    white-space: nowrap;
    flex-shrink: 0;
    padding: 9px 18px;
    font-size: 0.78rem;
  }

  /* Product Catalog Cards */
  .class-card.product-card-catalog {
    padding: 22px 18px;
    border-radius: var(--radius-md);
  }
  .product-spec-box {
    padding: 10px 14px;
    margin-bottom: 16px;
  }
  .product-spec-box .small {
    font-size: 0.76rem !important;
  }

  /* Product Detail Cards */
  .series-card {
    padding: 20px 16px;
    border-radius: var(--radius-md);
    margin-bottom: 20px;
  }
  .series-pdf-box {
    padding: 16px 14px !important;
  }
  .series-name {
    font-size: clamp(1.25rem, 5vw, 1.6rem);
  }
  .series-desc {
    font-size: 0.88rem;
    line-height: 1.65;
  }
  .series-spec-preview {
    padding: 10px 14px;
    margin-bottom: 14px;
  }
  .series-spec-row {
    font-size: 0.76rem;
    padding: 5px 0;
    gap: 8px;
  }
  .spec-values {
    white-space: normal;
    text-align: right;
  }
  .series-btn-primary, .series-btn-pdf {
    width: 100%;
    padding: 12px 16px;
    font-size: 0.78rem;
  }

  /* Tables */
  .table-responsive {
    -webkit-overflow-scrolling: touch;
  }
  .table td, .table th {
    padding: 9px 12px;
    font-size: 0.78rem;
  }

  /* Info Items */
  .info-item {
    padding: 12px 14px;
    gap: 12px;
  }
  .info-item .icon-wrap {
    width: 32px;
    height: 32px;
  }

  /* Footer */
  footer {
    padding-top: 60px;
    padding-bottom: 30px;
  }
}

@media (max-width: 480px) {
  .navbar-brand img {
    max-width: 135px !important;
  }
  .class-card {
    padding: 22px 16px;
  }
  .card-num {
    font-size: 2.4rem;
  }
  .stats-bar {
    grid-template-columns: 1fr 1fr !important;
    gap: 8px !important;
  }
  .stat-chip {
    padding: 8px 10px;
    gap: 6px;
  }
  .stat-chip i {
    font-size: 1.1rem;
  }
  .stat-chip .num {
    font-size: 0.95rem;
  }
  .stat-chip .label {
    font-size: 0.6rem;
  }
}