/* ==========================================================================
   Design System & Main Stylesheet - thaiserverrack.com
   Company: บริษัท แนปเทค จำกัด (Naptech Co., Ltd.)
   Design: B2B Modern Tech & Corporate E-Commerce
   ========================================================================== */

/* Font & Global Reset */
@import url('https://fonts.googleapis.com/css2?family=Prompt:wght@300;400;500;600;700&display=swap');

:root {
  --font-main: 'Prompt', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  
  /* Primary Color Palette (Tech Navy & Steel) */
  --color-primary-dark: #0A192F;
  --color-primary: #0F2744;
  --color-primary-light: #1E3E62;
  --color-accent-blue: #008BFF;
  --color-accent-cyan: #00D2FE;
  
  /* Action / Call to Action (Energy Orange & Line Green) */
  --color-cta: #FF6B00;
  --color-cta-hover: #E05D00;
  --color-line: #06C755;
  --color-line-hover: #05B34C;
  
  /* Neutral Colors */
  --color-bg-light: #F8FAFC;
  --color-bg-white: #FFFFFF;
  --color-card-bg: #FFFFFF;
  --color-text-main: #1E293B;
  --color-text-muted: #64748B;
  --color-text-light: #94A3B8;
  --color-border: #E2E8F0;
  --color-border-dark: #334155;

  /* Status Badges */
  --color-stock-in: #10B981;
  --color-stock-out: #EF4444;
  --color-stock-pre: #F59E0B;

  /* Shadows & Radius */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(15, 39, 68, 0.08);
  --shadow-lg: 0 10px 25px rgba(15, 39, 68, 0.12);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  --transition-fast: all 0.2s ease-in-out;
  --transition-normal: all 0.3s ease-in-out;
}

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

html {
  font-family: var(--font-main);
  font-size: 16px;
  scroll-behavior: smooth;
  color: var(--color-text-main);
  background-color: var(--color-bg-light);
  -webkit-text-size-adjust: 100%;
}

body {
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

a:hover {
  color: var(--color-primary-light);
}

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

/* Container */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Typography Utilities */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-primary-dark);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 0.75rem;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.65rem; }
h3 { font-size: 1.35rem; }
h4 { font-size: 1.15rem; }

@media (min-width: 768px) {
  h1 { font-size: 2.5rem; }
  h2 { font-size: 2rem; }
  h3 { font-size: 1.5rem; }
}

.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); }
.text-primary { color: var(--color-primary); }
.text-cta { color: var(--color-cta); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-main);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  transition: var(--transition-fast);
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--color-primary);
  color: #FFFFFF;
}
.btn-primary:hover {
  background-color: var(--color-primary-dark);
  color: #FFFFFF;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-cta {
  background-color: var(--color-cta);
  color: #FFFFFF;
}
.btn-cta:hover {
  background-color: var(--color-cta-hover);
  color: #FFFFFF;
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(255, 107, 0, 0.3);
}

.btn-line {
  background-color: var(--color-line);
  color: #FFFFFF;
}
.btn-line:hover {
  background-color: var(--color-line-hover);
  color: #FFFFFF;
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(6, 199, 85, 0.3);
}

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

.btn-sm {
  padding: 0.4rem 0.9rem;
  font-size: 0.85rem;
}

.btn-lg {
  padding: 0.9rem 2rem;
  font-size: 1.1rem;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.65rem;
  font-size: 0.78rem;
  font-weight: 600;
  border-radius: var(--radius-full);
}
.badge-success { background-color: rgba(16, 185, 129, 0.12); color: var(--color-stock-in); }
.badge-danger { background-color: rgba(239, 68, 68, 0.12); color: var(--color-stock-out); }
.badge-warning { background-color: rgba(245, 158, 11, 0.12); color: var(--color-stock-pre); }
.badge-category { background-color: rgba(0, 139, 255, 0.1); color: var(--color-accent-blue); }

/* Header & Top Bar */
.top-bar {
  background-color: var(--color-primary-dark);
  color: var(--color-text-light);
  font-size: 0.85rem;
  padding: 0.4rem 0;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.top-bar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.top-contact-list {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}
.top-contact-list a {
  color: var(--color-text-light);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}
.top-contact-list a:hover {
  color: var(--color-accent-cyan);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-normal);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.85rem;
  padding-bottom: 0.85rem;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--color-primary-dark);
  font-weight: 700;
  font-size: 1.3rem;
}
.brand-logo svg, .brand-logo img {
  height: 42px;
}
.brand-logo span.highlight {
  color: var(--color-accent-blue);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}
.main-nav a {
  color: var(--color-text-main);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.5rem 0.25rem;
  position: relative;
}
.main-nav a:hover, .main-nav a.active {
  color: var(--color-accent-blue);
}
.main-nav a.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-accent-blue);
  border-radius: var(--radius-full);
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--color-primary-dark);
  cursor: pointer;
}

@media (max-width: 991px) {
  .mobile-menu-toggle { display: block; }
  .main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-bg-white);
    flex-direction: column;
    align-items: flex-start;
    padding: 1rem 1.5rem;
    box-shadow: var(--shadow-lg);
    border-top: 1px solid var(--color-border);
  }
  .main-nav.show { display: flex; }
  .main-nav a { width: 100%; padding: 0.75rem 0; }
}

/* Hero Section */
.hero-section {
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
  color: #FFFFFF;
  padding: 4rem 0 5rem;
  position: relative;
  overflow: hidden;
}
.hero-section::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(0, 139, 255, 0.15) 0%, rgba(0,0,0,0) 70%);
  border-radius: 50%;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: center;
}
@media (min-width: 992px) {
  .hero-grid { grid-template-columns: 1.1fr 0.9fr; }
}
.hero-content h1 {
  color: #FFFFFF;
  font-size: 2.2rem;
  line-height: 1.25;
  margin-bottom: 1.25rem;
}
.hero-content h1 span {
  color: var(--color-accent-cyan);
}
.hero-content p {
  color: var(--color-text-light);
  font-size: 1.1rem;
  margin-bottom: 2rem;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}
.hero-features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(255,255,255,0.1);
}
.hero-feature-item {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-size: 0.9rem;
  color: var(--color-text-light);
}
.hero-feature-item i {
  color: var(--color-accent-cyan);
  font-size: 1.2rem;
}

/* Category Grid */
.section-padding {
  padding: 4rem 0;
}
.section-header {
  margin-bottom: 2.5rem;
}
.section-title {
  position: relative;
  display: inline-block;
}
.section-title::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 50px;
  height: 3px;
  background-color: var(--color-accent-blue);
  border-radius: var(--radius-full);
}
.section-header.text-center .section-title::after {
  left: 50%;
  transform: translateX(-50%);
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1.5rem;
}
.category-card {
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  text-align: center;
  transition: var(--transition-normal);
  display: flex;
  flex-direction: column;
  align-items: center;
}
.category-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-accent-blue);
}
.category-icon {
  width: 70px;
  height: 70px;
  background-color: rgba(0, 139, 255, 0.08);
  color: var(--color-accent-blue);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  margin-bottom: 1rem;
  transition: var(--transition-fast);
}
.category-card:hover .category-icon {
  background-color: var(--color-accent-blue);
  color: #FFFFFF;
}
.category-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.35rem;
}
.category-card p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* Product Cards Grid */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.75rem;
}
.product-card {
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: var(--transition-normal);
}
.product-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(0, 139, 255, 0.4);
}
.product-card-img {
  position: relative;
  background-color: #F1F5F9;
  height: 220px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}
.product-card-img img {
  max-height: 100%;
  object-fit: contain;
  transition: var(--transition-normal);
}
.product-card:hover .product-card-img img {
  transform: scale(1.05);
}
.product-badge-top {
  position: absolute;
  top: 0.75rem;
  left: 0.75rem;
}
.product-card-body {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}
.product-card-category {
  font-size: 0.8rem;
  color: var(--color-accent-blue);
  font-weight: 600;
  text-transform: uppercase;
  margin-bottom: 0.35rem;
}
.product-card-title {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  line-height: 1.4;
}
.product-card-title a {
  color: var(--color-primary-dark);
}
.product-card-title a:hover {
  color: var(--color-accent-blue);
}
.product-card-desc {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  margin-bottom: 1rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.product-card-price-row {
  margin-top: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
}
.product-price {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
}

/* Specs Table Component */
.table-specs {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  background-color: #FFFFFF;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}
.table-specs tr:nth-child(even) {
  background-color: #F8FAFC;
}
.table-specs th, .table-specs td {
  padding: 0.85rem 1.2rem;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.95rem;
}
.table-specs th {
  width: 35%;
  font-weight: 600;
  color: var(--color-primary-dark);
  background-color: #F1F5F9;
}

/* Product Detail Page */
.product-detail-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}
@media (min-width: 992px) {
  .product-detail-grid { grid-template-columns: 1fr 1fr; }
}

.gallery-main-img {
  background-color: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
}
.gallery-main-img img {
  max-height: 100%;
  object-fit: contain;
}
.gallery-thumbs {
  display: flex;
  gap: 0.75rem;
  overflow-x: auto;
}
.gallery-thumb-item {
  width: 80px;
  height: 80px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.25rem;
  cursor: pointer;
  background-color: #FFFFFF;
  transition: var(--transition-fast);
}
.gallery-thumb-item.active, .gallery-thumb-item:hover {
  border-color: var(--color-accent-blue);
}
.gallery-thumb-item img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

/* Reviews Grid & Cards */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.75rem;
}
.review-card {
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  transition: var(--transition-normal);
}
.review-card:hover {
  box-shadow: var(--shadow-md);
}
.review-stars {
  color: #F59E0B;
  font-size: 1rem;
  margin-bottom: 0.75rem;
}
.review-text {
  font-size: 0.95rem;
  color: var(--color-text-main);
  margin-bottom: 1.25rem;
  flex-grow: 1;
}
.review-author {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  border-top: 1px solid var(--color-border);
  padding-top: 1rem;
}
.review-author-info h4 {
  font-size: 0.95rem;
  margin-bottom: 0.1rem;
}
.review-author-info p {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}
.review-img-thumb {
  width: 100%;
  height: 180px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
}

/* Articles Grid */
.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.75rem;
}
.article-card {
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: var(--transition-normal);
}
.article-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.article-card-img {
  height: 200px;
  overflow: hidden;
}
.article-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition-normal);
}
.article-card:hover .article-card-img img {
  transform: scale(1.05);
}
.article-card-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}
.article-meta {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
  display: flex;
  gap: 1rem;
}
.article-card-title {
  font-size: 1.15rem;
  margin-bottom: 0.75rem;
}
.article-card-title a {
  color: var(--color-primary-dark);
}
.article-card-title a:hover {
  color: var(--color-accent-blue);
}

/* Breadcrumbs */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.88rem;
  color: var(--color-text-muted);
  margin: 1.5rem 0;
}
.breadcrumb a {
  color: var(--color-text-muted);
}
.breadcrumb a:hover {
  color: var(--color-accent-blue);
}
.breadcrumb-separator {
  color: var(--color-text-light);
  font-size: 0.75rem;
}

/* Pagination */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 3rem;
}
.page-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background-color: #FFFFFF;
  color: var(--color-text-main);
  font-weight: 500;
  transition: var(--transition-fast);
}
.page-link:hover, .page-link.active {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: #FFFFFF;
}

/* Sticky Mobile CTA Bar */
.sticky-mobile-cta {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 999;
  background-color: var(--color-primary-dark);
  padding: 0.65rem 1rem;
  box-shadow: 0 -4px 15px rgba(0,0,0,0.15);
}
.sticky-mobile-cta-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}
@media (max-width: 767px) {
  .sticky-mobile-cta { display: block; }
  body { padding-bottom: 60px; }
}

/* Footer */
.site-footer {
  background-color: var(--color-primary-dark);
  color: var(--color-text-light);
  padding: 4rem 0 2rem;
  margin-top: auto;
  font-size: 0.92rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 2.5rem;
  margin-bottom: 3rem;
}
.footer-col h3 {
  color: #FFFFFF;
  font-size: 1.15rem;
  margin-bottom: 1.25rem;
}
.footer-links {
  list-style: none;
}
.footer-links li {
  margin-bottom: 0.65rem;
}
.footer-links a {
  color: var(--color-text-light);
}
.footer-links a:hover {
  color: var(--color-accent-cyan);
  padding-left: 0.25rem;
}
.footer-contact-info p {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 0.85rem;
}
.footer-contact-info i {
  color: var(--color-accent-cyan);
  font-size: 1.1rem;
  margin-top: 0.2rem;
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.85rem;
}

/* Form Controls */
.form-group {
  margin-bottom: 1.25rem;
}
.form-label {
  display: block;
  font-weight: 500;
  margin-bottom: 0.4rem;
  color: var(--color-primary-dark);
}
.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  font-family: var(--font-main);
  font-size: 0.95rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background-color: #FFFFFF;
  transition: var(--transition-fast);
}
.form-control:focus {
  outline: none;
  border-color: var(--color-accent-blue);
  box-shadow: 0 0 0 3px rgba(0, 139, 255, 0.15);
}
textarea.form-control {
  resize: vertical;
  min-height: 120px;
}

/* Alerts */
.alert {
  padding: 1rem 1.25rem;
  border-radius: var(--radius-sm);
  margin-bottom: 1.5rem;
  font-size: 0.95rem;
}
.alert-success { background-color: rgba(16, 185, 129, 0.12); color: #065F46; border: 1px solid #A7F3D0; }
.alert-danger { background-color: rgba(239, 68, 68, 0.12); color: #991B1B; border: 1px solid #FECACA; }