/* ============================================================
   Style Guide — 塑胶制品B2B外贸官网 v2
   ============================================================ */

:root {
  --color-primary: #0066CC;
  --color-primary-dark: #004C99;
  --color-primary-light: #E6F2FF;
  --color-secondary: #00A651;
  --color-secondary-light: #E6F7EE;
  --color-accent: #FF6B00;
  --color-accent-hover: #E05A00;
  --color-dark: #1A1A2E;
  --color-gray: #545E75;
  --color-gray-light: #8B95A8;
  --color-border: #E5E8EC;
  --color-bg: #F5F7FA;
  --color-white: #FFFFFF;

  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-size-h1: 44px;
  --font-size-h2: 32px;
  --font-size-h3: 22px;
  --font-size-h4: 18px;
  --font-size-body: 16px;
  --font-size-sm: 14px;
  --font-size-xs: 12px;

  --radius-sm: 6px;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
  --shadow-primary: 0 0 0 3px rgba(0,102,204,0.15);

  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1240px;
  --nav-height: 68px;
}

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-family);
  font-size: var(--font-size-body);
  color: var(--color-gray);
  background: var(--color-white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-primary-dark); }
ul, ol { list-style: none; }
input, textarea, select, button { font-family: inherit; font-size: inherit; }

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-dark);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.02em;
}
h1 { font-size: var(--font-size-h1); }
h2 { font-size: var(--font-size-h2); }
h3 { font-size: var(--font-size-h3); }
h4 { font-size: var(--font-size-h4); }

.section-title {
  text-align: center;
  margin-bottom: 12px;
}
.section-subtitle {
  text-align: center;
  color: var(--color-gray-light);
  font-size: var(--font-size-sm);
  margin-bottom: 48px;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

/* --- Layout --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 28px;
}

.section { padding: 88px 0; }
.section-gray { background: var(--color-bg); }

.page-main {
  padding-top: calc(var(--nav-height) + 24px);
  min-height: 60vh;
}

.page-hero {
  background: linear-gradient(135deg, #003366 0%, #004C99 40%, #0066CC 100%);
  color: var(--color-white);
  padding: 64px 0 56px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.page-hero::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 48px;
  background: var(--color-white);
  clip-path: ellipse(60% 100% at 50% 100%);
}
.page-hero h1 {
  color: var(--color-white);
  font-size: 38px;
  margin-bottom: 12px;
}
.page-hero p {
  color: rgba(255,255,255,0.8);
  font-size: 16px;
  max-width: 560px;
  margin: 0 auto;
}

/* --- Navigation --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  display: flex;
  align-items: center;
}
.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.nav-logo {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-dark);
  display: flex;
  align-items: center;
  gap: 10px;
  letter-spacing: -0.01em;
}
.nav-logo .logo-icon {
  width: 38px;
  height: 38px;
  background: var(--color-primary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  font-size: 16px;
  font-weight: 800;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 6px;
}
.nav-menu a {
  display: block;
  padding: 8px 18px;
  color: var(--color-gray);
  font-weight: 500;
  font-size: 15px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  white-space: nowrap;
}
.nav-menu a:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
}
.nav-menu a.active {
  background: var(--color-primary);
  color: var(--color-white);
}

.nav-actions { display: flex; align-items: center; gap: 14px; }

.lang-switch {
  display: flex;
  border: 1.5px solid var(--color-border);
  border-radius: 24px;
  overflow: hidden;
  font-size: 13px;
}
.lang-switch button {
  padding: 5px 14px;
  border: none;
  background: transparent;
  cursor: pointer;
  color: var(--color-gray-light);
  font-weight: 500;
  transition: all var(--transition);
}
.lang-switch button.active {
  background: var(--color-primary);
  color: var(--color-white);
}

.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 30px;
  height: 30px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}
.hamburger span {
  display: block;
  width: 100%;
  height: 2.5px;
  background: var(--color-dark);
  border-radius: 2px;
  transition: all var(--transition);
}
.hamburger.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  font-weight: 600;
  font-size: 15px;
  border-radius: var(--radius-sm);
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  text-align: center;
  white-space: nowrap;
  letter-spacing: 0.01em;
}
.btn-primary {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}
.btn-primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: var(--color-white);
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}
.btn-secondary {
  background: var(--color-white);
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.btn-secondary:hover {
  background: var(--color-primary);
  color: var(--color-white);
  transform: translateY(-1px);
}
.btn-accent {
  background: var(--color-accent);
  color: var(--color-white);
  border-color: var(--color-accent);
}
.btn-accent:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  color: var(--color-white);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(255,107,0,0.3);
}
.btn-lg { padding: 15px 36px; font-size: 16px; }
.btn-sm { padding: 8px 18px; font-size: 13px; }
.btn-outline-light {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255,255,255,0.35);
}
.btn-outline-light:hover {
  background: rgba(255,255,255,0.12);
  border-color: rgba(255,255,255,0.6);
  color: var(--color-white);
}

/* --- Forms --- */
.form-group { margin-bottom: 20px; }
.form-group label {
  display: block;
  font-weight: 600;
  font-size: var(--font-size-sm);
  color: var(--color-dark);
  margin-bottom: 6px;
}
.form-input {
  width: 100%;
  padding: 11px 15px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-body);
  color: var(--color-dark);
  background: var(--color-white);
  transition: all var(--transition);
  outline: none;
}
.form-input:focus {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-primary);
}
.form-input::placeholder { color: #B0B8C8; }
textarea.form-input { resize: vertical; min-height: 130px; }

/* --- Cards --- */
.card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all var(--transition);
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.card-img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  background: var(--color-bg);
  display: block;
}

.card-body { padding: 20px 22px; }
.card-body h3 { font-size: 17px; margin-bottom: 8px; }
.card-body h3 a { color: var(--color-dark); }
.card-body h3 a:hover { color: var(--color-primary); }
.card-body > p {
  font-size: var(--font-size-sm);
  color: var(--color-gray-light);
  margin-bottom: 14px;
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 12px;
}
.tag {
  display: inline-block;
  padding: 3px 10px;
  font-size: var(--font-size-xs);
  border-radius: 4px;
  font-weight: 600;
  letter-spacing: 0.02em;
}
.tag-blue { background: var(--color-primary-light); color: var(--color-primary); }
.tag-green { background: var(--color-secondary-light); color: var(--color-secondary); }
.tag-gray { background: #F1F3F5; color: var(--color-gray); }
.tag-orange { background: #FFF0E6; color: var(--color-accent); }

/* --- Grid --- */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 28px; }

/* --- Hero Section --- */
.hero {
  margin-top: var(--nav-height);
  padding: 100px 0 0;
  background: linear-gradient(160deg, #001233 0%, #002266 30%, #003380 60%, #0066CC 100%);
  color: var(--color-white);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(0,102,204,0.3) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(255,107,0,0.15) 0%, transparent 40%);
  pointer-events: none;
}
.hero .container {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  padding-bottom: 80px;
}
.hero-content h1 {
  color: var(--color-white);
  font-size: 46px;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -0.03em;
}
.hero-content p {
  font-size: 17px;
  color: rgba(255,255,255,0.75);
  line-height: 1.8;
  margin-bottom: 32px;
  max-width: 520px;
}
.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}
.hero-image {
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-image img {
  width: 100%;
  max-width: 480px;
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.hero-stats-bar {
  background: rgba(255,255,255,0.06);
  backdrop-filter: blur(8px);
  border-top: 1px solid rgba(255,255,255,0.1);
  border-bottom: 1px solid rgba(255,255,255,0.1);
  padding: 28px 0;
  width: 100%;
}
.hero-stats-bar .container {
  max-width: 100%;
  padding: 0 60px;
}
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
  text-align: center;
  max-width: 1200px;
  margin: 0 auto;
}
.hero-stat-number {
  font-size: 38px;
  font-weight: 800;
  color: var(--color-white);
  margin-bottom: 4px;
  letter-spacing: -0.02em;
}
.hero-stat-label {
  font-size: var(--font-size-sm);
  color: rgba(255,255,255,0.6);
  font-weight: 500;
}

/* --- Features --- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
}
.feature-card {
  padding: 36px 28px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  text-align: center;
  transition: all var(--transition);
  background: var(--color-white);
}
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}
.feature-icon {
  width: 60px;
  height: 60px;
  margin: 0 auto 18px;
  background: var(--color-primary-light);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
}
.feature-icon svg {
  width: 28px;
  height: 28px;
  color: var(--color-primary);
}
.feature-card h3 {
  font-size: 17px;
  margin-bottom: 10px;
}
.feature-card p {
  font-size: var(--font-size-sm);
  color: var(--color-gray-light);
  line-height: 1.6;
}

/* --- Product showcase --- */
.product-showcase {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
}

/* --- Category tabs --- */
.category-tabs {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-bottom: 44px;
  flex-wrap: wrap;
}
.category-tab {
  padding: 9px 22px;
  border: 1.5px solid var(--color-border);
  border-radius: 24px;
  background: var(--color-white);
  cursor: pointer;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-gray);
  transition: all var(--transition);
}
.category-tab:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}
.category-tab.active {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

/* --- Case card --- */
.case-card .card-img {
  aspect-ratio: 16/9;
}
.case-card .case-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: var(--font-size-xs);
  color: var(--color-gray-light);
  margin-top: 8px;
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
}

/* --- About page --- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
.about-img {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.about-img img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
}
.about-content h2 { margin-bottom: 18px; }
.about-content p {
  margin-bottom: 14px;
  line-height: 1.85;
  color: var(--color-gray);
}

.about-stats-row {
  display: flex;
  gap: 40px;
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}
.about-stat-item { text-align: center; }
.about-stat-value {
  font-size: 32px;
  font-weight: 800;
  color: var(--color-primary);
}
.about-stat-label {
  font-size: var(--font-size-xs);
  color: var(--color-gray-light);
  margin-top: 4px;
}

.cert-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  max-width: 800px;
  margin: 0 auto;
}
.cert-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-dark);
  transition: all var(--transition);
  background: var(--color-white);
}
.cert-card:hover {
  border-color: var(--color-secondary);
  box-shadow: var(--shadow-sm);
}
.cert-icon {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  background: var(--color-secondary-light);
  color: var(--color-secondary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 14px;
}

/* --- Contact page --- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
}
.contact-info-card {
  padding: 32px;
  background: var(--color-bg);
  border-radius: var(--radius);
  margin-bottom: 28px;
}
.contact-info-item {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
}
.contact-info-item:last-child { margin-bottom: 0; }
.contact-info-icon {
  width: 46px;
  height: 46px;
  flex-shrink: 0;
  background: var(--color-white);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
}
.contact-info-icon svg {
  width: 22px;
  height: 22px;
  color: var(--color-primary);
}
.contact-info-item h4 {
  font-size: 15px;
  margin-bottom: 4px;
}
.contact-info-item p {
  font-size: var(--font-size-sm);
  color: var(--color-gray-light);
}
.contact-map {
  border-radius: var(--radius);
  overflow: hidden;
  height: 280px;
  background: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-gray-light);
  font-size: var(--font-size-sm);
  border: 1px solid var(--color-border);
}

.contact-form-card {
  padding: 36px;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}
.contact-form-card h3 {
  margin-bottom: 8px;
}

/* --- Product Detail --- */
.product-detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  margin-bottom: 72px;
}
.product-gallery {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.product-gallery img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
}
.product-info h1 {
  font-size: 32px;
  margin-bottom: 14px;
}
.product-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}
.product-desc {
  line-height: 1.85;
  color: var(--color-gray);
  margin-bottom: 24px;
}
.product-specs {
  border-top: 1px solid var(--color-border);
  padding-top: 24px;
  margin-top: 24px;
}
.product-specs h3 { margin-bottom: 16px; }
.spec-table { width: 100%; border-collapse: collapse; }
.spec-table th, .spec-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
  font-size: var(--font-size-sm);
}
.spec-table th {
  color: var(--color-dark);
  font-weight: 600;
  width: 30%;
  background: var(--color-bg);
}
.spec-table td { color: var(--color-gray); }

.features-section { margin-bottom: 72px; }
.features-section h3 { margin-bottom: 24px; text-align: center; }

.related-products { margin-top: 72px; }
.related-products h3 { margin-bottom: 28px; text-align: center; }

/* --- CTA Strip --- */
.cta-strip {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-white);
  padding: 72px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-strip::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 50%, rgba(255,255,255,0.05) 0%, transparent 50%);
  pointer-events: none;
}
.cta-strip .container { position: relative; z-index: 1; }
.cta-strip h2 { color: var(--color-white); margin-bottom: 12px; font-size: 30px; }
.cta-strip p { color: rgba(255,255,255,0.8); margin-bottom: 28px; max-width: 520px; margin-left: auto; margin-right: auto; }
.cta-strip .btn {
  background: var(--color-white);
  color: var(--color-primary);
  border-color: var(--color-white);
}
.cta-strip .btn:hover {
  background: rgba(255,255,255,0.92);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.15);
}

/* --- Footer --- */
.footer {
  background: #0F172A;
  color: rgba(255,255,255,0.6);
  padding: 64px 0 28px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 44px;
}
.footer h4 {
  color: var(--color-white);
  font-size: 16px;
  margin-bottom: 18px;
  font-weight: 600;
}
.footer p, .footer a {
  font-size: var(--font-size-sm);
  color: rgba(255,255,255,0.5);
  line-height: 2.2;
}
.footer a:hover { color: var(--color-white); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 24px;
  text-align: center;
  font-size: var(--font-size-xs);
  color: rgba(255,255,255,0.3);
}

/* --- AI Assistant --- */
.ai-bubble {
  position: fixed;
  bottom: 28px;
  right: 28px;
  z-index: 999;
}
.ai-bubble-btn {
  width: 54px;
  height: 54px;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-white);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(0,102,204,0.35);
  transition: all var(--transition);
  font-size: 22px;
}
.ai-bubble-btn:hover {
  background: var(--color-accent);
  transform: scale(1.06);
  box-shadow: 0 6px 24px rgba(255,107,0,0.4);
}
.ai-panel {
  position: absolute;
  bottom: 68px;
  right: 0;
  width: 360px;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  display: none;
  opacity: 0;
  transform: translateY(12px);
  transition: all var(--transition);
}
.ai-panel.open {
  display: block;
  opacity: 1;
  transform: translateY(0);
}
.ai-panel-header {
  background: var(--color-primary);
  color: var(--color-white);
  padding: 14px 20px;
  font-weight: 600;
  font-size: 15px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.ai-panel-close {
  background: none;
  border: none;
  color: var(--color-white);
  cursor: pointer;
  font-size: 18px;
  padding: 0;
  line-height: 1;
  opacity: 0.8;
}
.ai-panel-close:hover { opacity: 1; }
.ai-panel-body {
  padding: 18px;
  max-height: 300px;
  overflow-y: auto;
  font-size: var(--font-size-sm);
  color: var(--color-gray);
}
.ai-panel-footer {
  padding: 14px 18px;
  border-top: 1px solid var(--color-border);
  display: flex;
  gap: 8px;
}
.ai-panel-footer .form-input {
  flex: 1;
  font-size: var(--font-size-sm);
}

/* --- Breadcrumb --- */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: var(--font-size-sm);
  color: var(--color-gray-light);
  margin-bottom: 32px;
  flex-wrap: wrap;
}
.breadcrumb a { color: var(--color-gray-light); }
.breadcrumb a:hover { color: var(--color-primary); }
.breadcrumb span:last-child { color: var(--color-dark); font-weight: 500; }

/* --- Pagination --- */
.pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 48px;
}
.pagination button {
  width: 40px;
  height: 40px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-white);
  cursor: pointer;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-gray);
  transition: all var(--transition);
}
.pagination button.active,
.pagination button:hover {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

/* --- Animations --- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-in { animation: fadeInUp 0.6s ease forwards; }

@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}
.scale-in { animation: scaleIn 0.5s ease forwards; }

/* --- Back to Top --- */
.back-to-top {
  position: fixed;
  bottom: 96px;
  right: 28px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-white);
  color: var(--color-dark);
  border: 1.5px solid var(--color-border);
  cursor: pointer;
  font-size: 18px;
  display: none;
  z-index: 998;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
}
.back-to-top:hover {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

/* --- Form Success --- */
.form-success {
  display: none;
  margin-top: 18px;
  padding: 14px 18px;
  background: var(--color-secondary-light);
  color: var(--color-secondary);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  text-align: center;
  font-weight: 500;
}

/* --- Responsive: Tablet (768px–1199px) --- */
@media (max-width: 1199px) {
  .hero .container {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 40px;
  }
  .hero-content p { margin-left: auto; margin-right: auto; }
  .hero-actions { justify-content: center; }
  .hero-image { display: none; }
  .hero-content h1 { font-size: 36px; }

  .grid-4, .features-grid, .product-showcase { grid-template-columns: repeat(2, 1fr); }
  .cert-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .about-grid, .contact-grid, .product-detail-grid { grid-template-columns: 1fr; gap: 36px; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 28px; }
}

/* --- Responsive: Mobile (≤767px) --- */
@media (max-width: 767px) {
  :root {
    --font-size-h1: 28px;
    --font-size-h2: 22px;
    --font-size-h3: 18px;
    --font-size-body: 15px;
  }

  .container { padding: 0 16px; }
  .section { padding: 56px 0; }

  .hero { padding: 72px 0 0; }
  .hero .container { padding-bottom: 48px; }
  .hero-content h1 { font-size: 28px; }
  .hero-content p { font-size: 15px; }
  .hero-stat-number { font-size: 28px; }

  .page-hero h1 { font-size: 26px; }

  .hamburger { display: flex; }
  .nav-menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-white);
    flex-direction: column;
    padding: 16px;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow);
    display: none;
    gap: 4px;
  }
  .nav-menu.open { display: flex; }
  .nav-menu a { padding: 12px 16px; }

  .grid-2, .grid-3, .grid-4,
  .features-grid, .product-showcase,
  .cert-grid { grid-template-columns: 1fr; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 20px; }

  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .about-grid, .contact-grid, .product-detail-grid { grid-template-columns: 1fr; gap: 28px; }

  .hero-actions { flex-direction: column; align-items: center; }
  .hero-actions .btn { width: 100%; max-width: 280px; }
  .category-tabs { gap: 6px; }
  .category-tab { padding: 7px 14px; font-size: 13px; }

  .ai-panel { width: calc(100vw - 32px); right: -14px; }
  .ai-bubble { bottom: 20px; right: 20px; }

  .about-stats-row { flex-wrap: wrap; gap: 24px; justify-content: center; }
  .contact-form-card { padding: 24px; }
}