/* ============================================================
   STRONG PLASTIC MANUFACTURER — Design System
   Industrial · Precision · High-End Foreign Trade
   ============================================================ */

/* --- CSS Variables / Design Tokens --- */
:root {
  --primary: #0F172A;
  --primary-hover: #1E293B;
  --primary-light: #334155;
  --accent-green: #22C55E;
  --accent-green-hover: #16A34A;
  --accent-blue: #3B82F6;
  --accent-blue-hover: #2563EB;
  --neutral-800: #1E293B;
  --neutral-500: #64748B;
  --neutral-400: #94A3B8;
  --neutral-200: #E2E8F0;
  --neutral-100: #F1F5F9;
  --neutral-50: #F8FAFC;
  --white: #FFFFFF;
  --black: #0A0A0A;
  --font-heading: 'Inter', system-ui, -apple-system, sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 8px 32px rgba(15, 23, 42, 0.10);
  --shadow-xl: 0 16px 48px rgba(15, 23, 42, 0.12);
  --radius-none: 0px;
  --radius-sm: 2px;
  --radius-md: 4px;
  --transition-fast: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 260ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- Reset & Base --- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--neutral-800);
  background-color: var(--white);
  overflow-x: hidden;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--primary);
  line-height: 1.2;
}

h1 { font-size: clamp(2rem, 5vw, 3rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 3vw, 1.75rem); }
h4 { font-size: 1.25rem; }

p {
  color: var(--neutral-500);
  margin-bottom: 1rem;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* --- Container --- */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1rem;
}

@media (min-width: 768px) {
  .container {
    padding: 0 2rem;
  }
}

/* --- Section Spacing --- */
.section {
  padding: 3rem 0;
}

@media (min-width: 768px) {
  .section {
    padding: 5rem 0;
  }
}

.section-sm { padding: 2rem 0; }
.section-lg { padding: 4rem 0; }

@media (min-width: 768px) {
  .section-sm { padding: 3rem 0; }
  .section-lg { padding: 6rem 0; }
}

/* --- Section Header --- */
.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 3rem;
}

.section-header .subtitle {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent-blue);
  margin-bottom: 0.75rem;
}

.section-header h2 {
  margin-bottom: 1rem;
}

.section-header p {
  font-size: 1.0625rem;
  color: var(--neutral-500);
  line-height: 1.7;
}

.section-header.left {
  text-align: left;
  margin-left: 0;
}

/* --- Header / Navigation --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  transition: all var(--transition-base);
}

.header.scrolled {
  background: rgba(15, 23, 42, 0.98);
  box-shadow: 0 1px 20px rgba(0, 0, 0, 0.2);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.125rem;
  letter-spacing: -0.3px;
  color: var(--white);
  white-space: nowrap;
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: var(--accent-green);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 1rem;
  color: var(--primary);
  flex-shrink: 0;
}

.nav-list {
  display: none;
  list-style: none;
  gap: 0.25rem;
}

@media (min-width: 1024px) {
  .nav-list {
    display: flex;
  }
}

.nav-list a {
  display: block;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.78);
  letter-spacing: 0.2px;
  transition: color var(--transition-fast);
  position: relative;
}

.nav-list a:hover,
.nav-list a.active {
  color: var(--white);
}

.nav-list a::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 1rem;
  right: 1rem;
  height: 2px;
  background: var(--accent-green);
  transform: scaleX(0);
  transition: transform var(--transition-fast);
}

.nav-list a:hover::after,
.nav-list a.active::after {
  transform: scaleX(1);
}

/* Hamburger */
.hamburger {
  display: flex;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
  z-index: 1001;
}

@media (min-width: 1024px) {
  .hamburger {
    display: none;
  }
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--white);
  transition: all var(--transition-fast);
  transform-origin: center;
}

.hamburger.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Menu */
.mobile-menu {
  position: fixed;
  top: 0;
  right: -100%;
  width: 100%;
  max-width: 360px;
  height: 100vh;
  background: var(--primary);
  z-index: 999;
  padding: 5rem 2rem 2rem;
  transition: right var(--transition-base);
  overflow-y: auto;
}

.mobile-menu.active {
  right: 0;
}

.mobile-menu a {
  display: block;
  padding: 0.875rem 0;
  font-size: 1.0625rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.8);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  transition: color var(--transition-fast);
}

.mobile-menu a:hover,
.mobile-menu a.active {
  color: var(--accent-green);
}

.mobile-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 998;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

.mobile-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.875rem;
  letter-spacing: 0.3px;
  padding: 0.75rem 1.75rem;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-transform: uppercase;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent-green);
  color: var(--primary);
  border-color: var(--accent-green);
}

.btn-primary:hover {
  background: var(--accent-green-hover);
  border-color: var(--accent-green-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(34, 197, 94, 0.3);
}

.btn-outline {
  background: transparent;
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.4);
}

.btn-outline:hover {
  background: var(--white);
  color: var(--primary);
  border-color: var(--white);
}

.btn-outline-dark {
  background: transparent;
  color: var(--primary);
  border-color: var(--primary);
}

.btn-outline-dark:hover {
  background: var(--primary);
  color: var(--white);
}

.btn-white {
  background: var(--white);
  color: var(--primary);
  border-color: var(--white);
}

.btn-white:hover {
  background: transparent;
  color: var(--white);
}

.btn-lg {
  padding: 0.875rem 2.25rem;
  font-size: 0.9375rem;
}

.btn-sm {
  padding: 0.5rem 1.25rem;
  font-size: 0.8125rem;
}

/* --- Hero Section --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--primary);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 30% 50%, rgba(59, 130, 246, 0.12) 0%, transparent 60%),
    radial-gradient(ellipse at 70% 20%, rgba(34, 197, 94, 0.08) 0%, transparent 50%);
  pointer-events: none;
}

.hero-pattern {
  position: absolute;
  inset: 0;
  opacity: 0.03;
  background-image:
    linear-gradient(rgba(255,255,255,0.1) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.1) 1px, transparent 1px);
  background-size: 60px 60px;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 720px;
  padding: 6rem 0 3rem;
}

.hero .subtitle {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: var(--accent-green);
  margin-bottom: 1.25rem;
}

.hero h1 {
  font-size: clamp(2.25rem, 5.5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.1;
  color: var(--white);
  margin-bottom: 1.5rem;
}

.hero h1 span {
  color: var(--accent-green);
}

.hero p {
  font-size: 1.125rem;
  color: rgba(255, 255, 255, 0.65);
  line-height: 1.7;
  margin-bottom: 2.25rem;
  max-width: 540px;
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 3.5rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.hero-stat-value {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--white);
  letter-spacing: -0.5px;
}

.hero-stat-label {
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.5);
  text-transform: uppercase;
  letter-spacing: 1px;
}

@media (max-width: 640px) {
  .hero-stats {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
}

/* --- Card Base --- */
.card {
  background: var(--white);
  border: 1px solid var(--neutral-200);
  transition: all var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  border-color: transparent;
}

/* --- Product Card --- */
.product-card {
  overflow: hidden;
}

.product-card .card-image {
  position: relative;
  aspect-ratio: 4 / 3;
  background: var(--neutral-100);
  overflow: hidden;
}

.product-card .card-image .placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--neutral-100), var(--neutral-200));
  color: var(--neutral-400);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  transition: transform var(--transition-base);
}

.product-card:hover .card-image .placeholder {
  transform: scale(1.05);
}

.product-card .card-tag {
  position: absolute;
  top: 0.75rem;
  left: 0.75rem;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  padding: 0.25rem 0.625rem;
  background: var(--accent-blue);
  color: var(--white);
}

.product-card .card-body {
  padding: 1.25rem;
}

.product-card .card-body h4 {
  font-size: 1.0625rem;
  margin-bottom: 0.375rem;
}

.product-card .card-body .category {
  font-size: 0.8125rem;
  color: var(--accent-blue);
  font-weight: 500;
}

/* --- Advantage Card --- */
.advantage-card {
  padding: 2rem 1.5rem;
  text-align: center;
  border: 1px solid var(--neutral-200);
  background: var(--white);
  transition: all var(--transition-base);
}

.advantage-card:hover {
  border-color: var(--accent-blue);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.advantage-card .icon-box {
  width: 56px;
  height: 56px;
  margin: 0 auto 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(59, 130, 246, 0.08);
}

.advantage-card .icon-box svg {
  width: 28px;
  height: 28px;
  color: var(--accent-blue);
}

.advantage-card h4 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.advantage-card p {
  font-size: 0.875rem;
  color: var(--neutral-500);
  margin-bottom: 0;
}

/* --- Case Card --- */
.case-card {
  position: relative;
  overflow: hidden;
}

.case-card .card-image {
  aspect-ratio: 16 / 10;
  background: var(--neutral-100);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.case-card .card-image .placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--neutral-800), var(--primary));
  color: rgba(255, 255, 255, 0.3);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  transition: transform var(--transition-base);
}

.case-card:hover .card-image .placeholder {
  transform: scale(1.05);
}

.case-card .card-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 1.5rem;
  background: linear-gradient(transparent, rgba(15, 23, 42, 0.9));
  color: var(--white);
}

.case-card .card-overlay .industry {
  font-size: 0.6875rem;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--accent-green);
  margin-bottom: 0.25rem;
}

.case-card .card-overlay h4 {
  font-size: 1.125rem;
  color: var(--white);
  margin-bottom: 0;
}

/* --- News Card --- */
.news-card {
  background: var(--white);
  border: 1px solid var(--neutral-200);
  overflow: hidden;
  transition: all var(--transition-base);
}

.news-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.news-card .card-image {
  aspect-ratio: 16 / 9;
  background: var(--neutral-100);
  display: flex;
  align-items: center;
  justify-content: center;
}

.news-card .card-image .placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--neutral-100), var(--neutral-200));
  color: var(--neutral-400);
}

.news-card .card-body {
  padding: 1.25rem;
}

.news-card .card-body .date {
  font-size: 0.8125rem;
  color: var(--neutral-400);
  margin-bottom: 0.5rem;
}

.news-card .card-body h4 {
  font-size: 1.0625rem;
  margin-bottom: 0.5rem;
  line-height: 1.4;
}

.news-card .card-body p {
  font-size: 0.875rem;
  color: var(--neutral-500);
  margin-bottom: 0.75rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-card .card-body .read-more {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--accent-blue);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* --- Page Banner (inner pages) --- */
.page-banner {
  position: relative;
  background: var(--primary);
  padding: 7rem 0 3.5rem;
  text-align: center;
  overflow: hidden;
}

.page-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 50% 50%, rgba(59, 130, 246, 0.1) 0%, transparent 60%);
}

.page-banner .pattern {
  position: absolute;
  inset: 0;
  opacity: 0.03;
  background-image:
    linear-gradient(rgba(255,255,255,0.1) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.1) 1px, transparent 1px);
  background-size: 60px 60px;
}

.page-banner h1 {
  position: relative;
  color: var(--white);
  margin-bottom: 0.5rem;
}

.page-banner .breadcrumb {
  position: relative;
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.5);
}

.page-banner .breadcrumb a {
  color: rgba(255, 255, 255, 0.7);
  transition: color var(--transition-fast);
}

.page-banner .breadcrumb a:hover {
  color: var(--white);
}

.page-banner .breadcrumb span {
  margin: 0 0.5rem;
}

/* --- Grid Layouts --- */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

@media (min-width: 768px) {
  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }
}

.grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 640px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

.grid-4 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 640px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid-4 {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* --- About Page --- */
.about-image {
  position: relative;
}

.about-image .placeholder-box {
  aspect-ratio: 4 / 3;
  background: linear-gradient(135deg, var(--neutral-100), var(--neutral-200));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--neutral-400);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.about-image .experience-badge {
  position: absolute;
  bottom: -1rem;
  right: -1rem;
  background: var(--accent-green);
  color: var(--primary);
  padding: 1.25rem 1.5rem;
  text-align: center;
}

@media (max-width: 768px) {
  .about-image .experience-badge {
    right: 0;
    bottom: -1rem;
  }
}

.about-image .experience-badge .number {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1;
}

.about-image .experience-badge .text {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* Stats bar */
.stats-bar {
  background: var(--primary);
  padding: 2.5rem 0;
}

.stat-item {
  text-align: center;
  padding: 1rem;
}

.stat-item .value {
  font-size: 2rem;
  font-weight: 800;
  color: var(--white);
  letter-spacing: -0.5px;
}

.stat-item .value span {
  color: var(--accent-green);
}

.stat-item .label {
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.55);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-top: 0.25rem;
}

/* --- Process Steps --- */
.process-step {
  display: flex;
  gap: 1.5rem;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--neutral-200);
}

.process-step:last-child {
  border-bottom: none;
}

.process-step .step-number {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 800;
  background: var(--primary);
  color: var(--white);
}

.process-step .step-content h4 {
  margin-bottom: 0.25rem;
}

.process-step .step-content p {
  font-size: 0.9375rem;
  margin-bottom: 0;
}

/* --- Contact --- */
.contact-info-item {
  display: flex;
  gap: 1rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--neutral-200);
}

.contact-info-item:first-child {
  padding-top: 0;
}

.contact-info-item .icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  background: rgba(59, 130, 246, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
}

.contact-info-item .icon svg {
  width: 20px;
  height: 20px;
  color: var(--accent-blue);
}

.contact-info-item h5 {
  font-size: 0.9375rem;
  margin-bottom: 0.125rem;
}

.contact-info-item span {
  font-size: 0.875rem;
  color: var(--neutral-500);
}

/* Form */
.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 0.375rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.75rem;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  border: 1px solid var(--neutral-200);
  background: var(--white);
  color: var(--primary);
  transition: border-color var(--transition-fast);
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--accent-blue);
}

.form-group textarea {
  resize: vertical;
  min-height: 130px;
}

/* --- Filter Bar --- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.filter-btn {
  padding: 0.5rem 1.25rem;
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  background: transparent;
  border: 1px solid var(--neutral-200);
  color: var(--neutral-500);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: var(--font-body);
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--white);
}

/* --- Pagination --- */
.pagination {
  display: flex;
  justify-content: center;
  gap: 0.375rem;
  margin-top: 3rem;
}

.pagination button {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  font-weight: 500;
  background: transparent;
  border: 1px solid var(--neutral-200);
  color: var(--neutral-500);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: var(--font-body);
}

.pagination button:hover,
.pagination button.active {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--white);
}

/* --- CTA Section --- */
.cta-section {
  background: var(--primary);
  padding: 4rem 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 50%, rgba(34, 197, 94, 0.08) 0%, transparent 60%);
}

.cta-section .container {
  position: relative;
}

.cta-section h2 {
  color: var(--white);
  margin-bottom: 0.75rem;
}

.cta-section p {
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 1.75rem;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

/* --- Footer --- */
.footer {
  background: var(--neutral-800);
  color: rgba(255, 255, 255, 0.65);
  padding: 4rem 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
}

@media (min-width: 640px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
  }
}

.footer-col h4 {
  color: var(--white);
  font-size: 0.9375rem;
  margin-bottom: 1.25rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.footer-col p,
.footer-col li {
  font-size: 0.875rem;
  margin-bottom: 0.5rem;
}

.footer-col ul {
  list-style: none;
}

.footer-col ul li a {
  color: rgba(255, 255, 255, 0.55);
  transition: color var(--transition-fast);
}

.footer-col ul li a:hover {
  color: var(--accent-green);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 1.5rem 0;
  margin-top: 3rem;
  text-align: center;
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.4);
}

/* --- Floating Customer Service --- */
.floating-cs {
  position: fixed;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  z-index: 900;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.floating-cs .cs-item {
  position: relative;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary);
  color: var(--white);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.floating-cs .cs-item:hover {
  background: var(--accent-green);
  color: var(--primary);
}

.floating-cs .cs-item svg {
  width: 20px;
  height: 20px;
}

.floating-cs .cs-item .cs-tooltip {
  position: absolute;
  right: 60px;
  background: var(--primary);
  color: var(--white);
  padding: 0.625rem 1rem;
  font-size: 0.8125rem;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast);
}

.floating-cs .cs-item:hover .cs-tooltip {
  opacity: 1;
}

.floating-cs .cs-item .qr-popup {
  position: absolute;
  right: 60px;
  bottom: 0;
  width: 160px;
  height: 160px;
  background: var(--white);
  border: 1px solid var(--neutral-200);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast);
}

.floating-cs .cs-item:hover .qr-popup {
  opacity: 1;
}

.floating-cs .cs-item .qr-popup .qr-placeholder {
  width: 120px;
  height: 120px;
  background: var(--neutral-100);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  color: var(--neutral-400);
  text-align: center;
  line-height: 1.3;
}

/* --- Scroll Animation --- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Detail Page Layout --- */
.detail-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
}

@media (min-width: 1024px) {
  .detail-layout {
    grid-template-columns: 1fr 340px;
  }
}

/* Sidebar */
.sidebar-widget {
  background: var(--neutral-50);
  border: 1px solid var(--neutral-200);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.sidebar-widget h4 {
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--primary);
}

.sidebar-widget ul {
  list-style: none;
}

.sidebar-widget ul li {
  padding: 0.625rem 0;
  border-bottom: 1px solid var(--neutral-200);
  font-size: 0.875rem;
}

.sidebar-widget ul li:last-child {
  border-bottom: none;
}

.sidebar-widget ul li a {
  color: var(--neutral-500);
  transition: color var(--transition-fast);
}

.sidebar-widget ul li a:hover {
  color: var(--accent-blue);
}

/* Product Gallery */
.product-gallery {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

@media (min-width: 768px) {
  .product-gallery {
    grid-template-columns: 80px 1fr;
  }
}

.product-gallery .thumb-list {
  display: flex;
  gap: 0.5rem;
}

@media (min-width: 768px) {
  .product-gallery .thumb-list {
    flex-direction: column;
  }
}

.product-gallery .thumb {
  width: 80px;
  height: 60px;
  background: var(--neutral-100);
  border: 2px solid transparent;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.6rem;
  color: var(--neutral-400);
  transition: border-color var(--transition-fast);
}

.product-gallery .thumb.active,
.product-gallery .thumb:hover {
  border-color: var(--accent-blue);
}

.product-gallery .main-image {
  aspect-ratio: 4 / 3;
  background: var(--neutral-100);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--neutral-400);
  font-size: 0.875rem;
}

/* Product specs table */
.specs-table {
  width: 100%;
  border-collapse: collapse;
}

.specs-table tr {
  border-bottom: 1px solid var(--neutral-200);
}

.specs-table tr:last-child {
  border-bottom: none;
}

.specs-table td {
  padding: 0.75rem 0;
  font-size: 0.875rem;
}

.specs-table td:first-child {
  font-weight: 600;
  color: var(--primary);
  width: 35%;
}

.specs-table td:last-child {
  color: var(--neutral-500);
}

/* --- Tags --- */
.tag {
  display: inline-block;
  padding: 0.25rem 0.625rem;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  background: rgba(59, 130, 246, 0.08);
  color: var(--accent-blue);
}

/* --- Divider --- */
.divider {
  width: 48px;
  height: 3px;
  background: var(--accent-green);
  margin: 0 auto 1.5rem;
}

.divider.left {
  margin-left: 0;
}

/* --- Two Column Content --- */
.two-col {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  align-items: center;
}

@media (min-width: 768px) {
  .two-col {
    grid-template-columns: 1fr 1fr;
  }
}

/* --- Certifications --- */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

@media (min-width: 640px) {
  .cert-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.cert-item {
  padding: 1.5rem;
  text-align: center;
  border: 1px solid var(--neutral-200);
  background: var(--white);
  transition: all var(--transition-fast);
}

.cert-item:hover {
  border-color: var(--accent-blue);
}

.cert-item .cert-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 0.75rem;
  background: rgba(34, 197, 94, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
}

.cert-item h5 {
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 0.125rem;
}

.cert-item span {
  font-size: 0.75rem;
  color: var(--neutral-400);
}

/* --- Back to Top --- */
.back-to-top {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  width: 44px;
  height: 44px;
  background: var(--primary);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 899;
  opacity: 0;
  pointer-events: none;
  transition: all var(--transition-fast);
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
}

.back-to-top:hover {
  background: var(--accent-green);
  color: var(--primary);
}

/* --- Utility --- */
.bg-primary { background: var(--primary); }
.bg-neutral-50 { background: var(--neutral-50); }
.bg-neutral-100 { background: var(--neutral-100); }
.bg-white { background: var(--white); }
.text-primary { color: var(--primary); }
.text-accent { color: var(--accent-green); }
.text-blue { color: var(--accent-blue); }
.text-white { color: var(--white); }
.text-muted { color: var(--neutral-500); }
.mb-0 { margin-bottom: 0; }
.mt-0 { margin-top: 0; }
.text-center { text-align: center; }
.font-bold { font-weight: 700; }
.font-extrabold { font-weight: 800; }
.uppercase { text-transform: uppercase; }
.letter-spacing { letter-spacing: 1px; }
.relative { position: relative; }
.overflow-hidden { overflow: hidden; }

/* --- Responsive helpers --- */
@media (max-width: 640px) {
  .hide-mobile { display: none !important; }
}

@media (min-width: 641px) {
  .show-mobile { display: none !important; }
}