/* SPNet Corporate Website Stylesheet */

/* Design Tokens & Theme Variables */
:root {
  --primary-hue: 215;
  --accent-hue: 195;
  --accent-alt-hue: 260;

  /* Font Styles */
  --font-main: 'Inter', system-ui, -apple-system, sans-serif;
  --font-display: 'Outfit', sans-serif;

  /* Light Theme Variables */
  --bg-app: hsl(var(--primary-hue), 30%, 98%);
  --bg-surface: hsl(0, 0%, 100%);
  --bg-nav: rgba(255, 255, 255, 0.8);
  --border-color: hsl(var(--primary-hue), 20%, 90%);
  --text-main: hsl(var(--primary-hue), 40%, 15%);
  --text-muted: hsl(var(--primary-hue), 20%, 45%);
  
  --primary-color: hsl(var(--primary-hue), 85%, 45%);
  --accent-color: hsl(var(--accent-hue), 95%, 40%);
  --accent-alt: hsl(var(--accent-alt-hue), 85%, 55%);
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.12);
  
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(255, 255, 255, 0.5);
  --glass-blur: 16px;
  
  --transition-speed: 0.3s;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
}

/* Dark Theme Variables overrides */
html.dark {
  --bg-app: hsl(var(--primary-hue), 40%, 6%);
  --bg-surface: hsl(var(--primary-hue), 35%, 10%);
  --bg-nav: rgba(11, 15, 25, 0.8);
  --border-color: hsl(var(--primary-hue), 25%, 15%);
  --text-main: hsl(var(--primary-hue), 20%, 95%);
  --text-muted: hsl(var(--primary-hue), 15%, 70%);
  
  --primary-color: hsl(var(--primary-hue), 95%, 65%);
  --accent-color: hsl(var(--accent-hue), 90%, 55%);
  --accent-alt: hsl(var(--accent-alt-hue), 90%, 65%);
  
  --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.6);
  
  --glass-bg: rgba(15, 23, 42, 0.65);
  --glass-border: rgba(255, 255, 255, 0.05);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

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

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color var(--transition-speed);
}

a:hover {
  color: var(--accent-color);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-main);
}

/* Glassmorphism utility class */
.glassmorphism {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-md);
  border-radius: var(--radius-md);
}

/* Layout Utilities */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: 100px 0;
  border-bottom: 1px solid var(--border-color);
}

/* Header & Navigation */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  border-bottom: 1px solid var(--border-color);
  transition: background-color var(--transition-speed);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}

.logo-link {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-img {
  height: 48px;
  width: auto;
  transition: transform var(--transition-speed) ease;
}

.logo-link:hover .logo-img {
  transform: scale(1.05);
}

.logo-text {
  font-size: 1.4rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 24px;
}

.nav-links a {
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.95rem;
}

.nav-links a:hover {
  color: var(--primary-color);
}

/* Controls panel in header */
.header-controls {
  display: flex;
  align-items: center;
  gap: 16px;
}

.lang-selector {
  display: flex;
  background: var(--border-color);
  border-radius: var(--radius-sm);
  padding: 2px;
}

.lang-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  padding: 6px 12px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  border-radius: calc(var(--radius-sm) - 2px);
  transition: all var(--transition-speed);
}

.lang-btn.active {
  background: var(--bg-surface);
  color: var(--primary-color);
  box-shadow: var(--shadow-sm);
}

.theme-toggle-btn {
  background: var(--border-color);
  border: none;
  color: var(--text-main);
  padding: 8px 16px;
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all var(--transition-speed);
}

.theme-toggle-btn:hover {
  background: var(--primary-color);
  color: white;
}

/* Hero Section */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 120px;
  overflow: hidden;
  background: linear-gradient(135deg, rgba(13, 20, 35, 0.05), rgba(0, 200, 255, 0.05));
}

html.dark .hero {
  background: radial-gradient(circle at 80% 20%, rgba(0, 180, 216, 0.08), transparent 40%),
              radial-gradient(circle at 10% 80%, rgba(139, 92, 246, 0.08), transparent 40%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 64px;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.hero-title {
  font-size: 3.5rem;
  line-height: 1.1;
  background: linear-gradient(135deg, var(--text-main) 60%, var(--accent-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-muted);
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-top: 16px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  font-weight: 600;
  font-size: 1rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-speed) ease;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  color: white;
  box-shadow: 0 4px 14px rgba(0, 180, 216, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 180, 216, 0.4);
  color: white;
}

.btn-secondary {
  background: var(--bg-surface);
  color: var(--text-main);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--border-color);
  transform: translateY(-2px);
}

/* Animated Tech Illustration in Hero */
.hero-illustration {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.illustration-box {
  width: 400px;
  height: 400px;
  border-radius: 40% 60% 70% 30% / 40% 50% 60% 50%;
  background: linear-gradient(135deg, rgba(0, 180, 216, 0.2), rgba(139, 92, 246, 0.2));
  animation: blob-animate 8s ease-in-out infinite alternate;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.illustration-icon {
  font-size: 6rem;
  filter: drop-shadow(0 10px 20px rgba(0, 0, 0, 0.2));
  animation: float-animate 4s ease-in-out infinite;
}

@keyframes blob-animate {
  0% { border-radius: 40% 60% 70% 30% / 40% 50% 60% 50%; }
  100% { border-radius: 70% 30% 50% 50% / 30% 60% 40% 70%; }
}

@keyframes float-animate {
  0% { transform: translateY(0px) rotate(0deg); }
  50% { transform: translateY(-15px) rotate(3deg); }
  100% { transform: translateY(0px) rotate(0deg); }
}

/* Services Section */
.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 64px auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.section-title {
  font-size: 2.5rem;
}

.section-subtitle {
  color: var(--text-muted);
  font-size: 1.1rem;
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.service-card {
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  transition: all var(--transition-speed) ease;
}

.service-card:hover {
  transform: translateY(-8px);
  border-color: var(--primary-color);
  box-shadow: var(--shadow-lg);
}

.service-icon {
  font-size: 2.5rem;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  width: fit-content;
}

.service-card-title {
  font-size: 1.35rem;
}

.service-card-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Products Section */
.products-wrapper {
  display: flex;
  flex-direction: column;
  gap: 48px;
}

.product-item {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 64px;
  align-items: center;
}

.product-item.reverse {
  grid-template-columns: 1.2fr 1fr;
}

.product-item.reverse .product-content {
  grid-column: 2;
}

.product-item.reverse .product-visual {
  grid-column: 1;
  grid-row: 1;
}

.product-visual {
  display: flex;
  justify-content: center;
}

.product-showcase-box {
  width: 100%;
  max-width: 480px;
  padding: 40px;
  border-radius: var(--radius-lg);
}

.product-content {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.product-badge {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--primary-color);
  letter-spacing: 1px;
}

.product-name {
  font-size: 2rem;
}

.product-desc {
  color: var(--text-muted);
  font-size: 1.05rem;
}

.product-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.product-features li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.95rem;
}

.feat-bullet {
  color: var(--accent-color);
  font-weight: bold;
}

/* News & Curated Links Section */
.news-grids {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.news-column {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.column-header {
  font-size: 1.5rem;
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 12px;
}

.links-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.link-card {
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: all var(--transition-speed);
}

.link-card:hover {
  transform: scale(1.02);
  border-color: var(--primary-color);
  box-shadow: var(--shadow-md);
}

.card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.source-badge {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 50px;
  background: rgba(0, 180, 216, 0.1);
  color: var(--accent-color);
}

.source-badge.badge-alt {
  background: rgba(139, 92, 246, 0.1);
  color: var(--accent-alt);
}

.visit-text {
  font-size: 0.8rem;
  color: var(--primary-color);
  font-weight: 600;
}

.link-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-main);
  line-height: 1.4;
}

/* About Us Section with Reference Filters */
.about-box {
  display: flex;
  flex-direction: column;
  gap: 48px;
  margin-bottom: 80px;
}

.about-text-content {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 64px;
}

.about-story {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.about-tech-stack {
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.tech-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tech-tag {
  font-size: 0.8rem;
  padding: 6px 12px;
  border-radius: 50px;
  background: var(--border-color);
  color: var(--text-muted);
  font-weight: 500;
}

/* Site References Sub-section */
.references-wrapper {
  margin-top: 40px;
}

.filter-bar {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 40px;
}

.filter-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 10px 20px;
  font-weight: 600;
  font-size: 0.9rem;
  border-radius: 50px;
  cursor: pointer;
  transition: all var(--transition-speed);
}

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

.references-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.ref-card {
  padding: 32px;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: transform var(--transition-speed);
}

.ref-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary-color);
}

.ref-card-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 12px;
  margin-bottom: 8px;
}

.client-logo-container {
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-app);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  padding: 6px;
  flex-shrink: 0;
  transition: all var(--transition-speed);
}

.ref-card:hover .client-logo-container {
  border-color: var(--primary-color);
  transform: scale(1.05);
}

.client-logo {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.client-name {
  font-size: 1.1rem;
  color: var(--text-main);
  line-height: 1.3;
}

.system-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 8px;
}

.system-list li {
  font-size: 0.9rem;
  color: var(--text-muted);
  display: flex;
  align-items: flex-start;
  gap: 8px;
  line-height: 1.4;
}

.bullet-icon {
  color: var(--accent-color);
  font-size: 0.8rem;
  margin-top: 2px;
}

.category-tag {
  position: absolute;
  top: 16px;
  right: 16px;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 2px 8px;
  border-radius: 4px;
}

.tag-sap { background: rgba(0, 180, 216, 0.1); color: var(--accent-color); }
.tag-custom { background: rgba(139, 92, 246, 0.1); color: var(--accent-alt); }
.tag-pm { background: rgba(16, 185, 129, 0.1); color: #10b981; }

/* Contact Us Section */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 64px;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.info-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.info-label {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--accent-color);
}

.info-value {
  font-size: 1.1rem;
  color: var(--text-main);
}

/* Form Styles */
.contact-form-box {
  padding: 40px;
  border-radius: var(--radius-lg);
}

.form-group-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 20px;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
}

.form-group input, .form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  background: var(--bg-app);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  font-family: var(--font-main);
  transition: all var(--transition-speed);
}

.form-group input:focus, .form-group textarea:focus {
  border-color: var(--primary-color);
  outline: none;
  box-shadow: 0 0 0 3px rgba(0, 180, 216, 0.15);
}

.status-box {
  padding: 16px;
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
  font-weight: 600;
  display: none;
}

.status-box.success {
  background: rgba(16, 185, 129, 0.1);
  color: #10b981;
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.status-box.error {
  background: rgba(239, 68, 68, 0.1);
  color: #ef4444;
  border: 1px solid rgba(239, 68, 68, 0.2);
}

.spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: white;
  animation: spin 0.8s linear infinite;
  margin-right: 8px;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Footer Section */
footer {
  padding: 40px 0;
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  text-align: center;
}

.footer-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.footer-text {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Responsive Breakpoints */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }
  
  .hero-illustration {
    order: -1;
  }
  
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .product-item {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  
  .product-item.reverse {
    grid-template-columns: 1fr;
  }
  
  .product-item.reverse .product-content {
    grid-column: 1;
  }
  
  .about-text-content {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

@media (max-width: 768px) {
  nav {
    display: none; /* In a production layout, we can build a mobile burger menu. For now we prioritize clean layout with basic header controls */
  }
  
  .services-grid {
    grid-template-columns: 1fr;
  }
  
  .news-grids {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  
  .references-grid {
    grid-template-columns: 1fr;
  }
  
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .form-group-row {
    grid-template-columns: 1fr;
    gap: 0;
  }
}

.illustration-icon {
  font-size: 24px;       /* Changes icon size */
  color: #ff5722;       /* Changes icon color */
  font-variation-settings:
    'FILL' 0,           /* 0 for outlined, 1 for filled */
    'wght' 400,         /* Thickness (100 to 700) */
    'GRAD' 0,           /* Granular thickness (-25 to 200) */
    'opsz' 48;          /* Optical size (20px to 48px) */
}

/* สั่งให้ขึ้นบรรทัดใหม่ทุกครั้ง */
.material-symbols-outlined {
  display: block; 
}