/* ============================================
   THAN ĐÁ THÁI BÌNH - DESIGN SYSTEM
   ============================================ */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Roboto:wght@300;400;500;700&display=swap');

/* ============================================
   CSS VARIABLES
   ============================================ */
:root {
  /* Primary Colors - Industrial Coal Theme */
  --primary: #E8A019;
  --primary-dark: #C4870F;
  --primary-light: #F5C44E;
  --primary-glow: rgba(232, 160, 25, 0.3);

  /* Accent */
  --accent: #FF6B2C;
  --accent-dark: #D4511A;

  /* Neutrals */
  --dark-900: #0A0A0A;
  --dark-800: #141414;
  --dark-700: #1E1E1E;
  --dark-600: #2A2A2A;
  --dark-500: #3A3A3A;
  --dark-400: #555555;
  --dark-300: #777777;
  --dark-200: #999999;
  --dark-100: #CCCCCC;

  --light-100: #F8F8F8;
  --light-200: #EEEEEE;
  --light-300: #E0E0E0;

  --white: #FFFFFF;
  --black: #000000;

  /* Semantic */
  --success: #22C55E;
  --warning: #F59E0B;
  --error: #EF4444;
  --info: #3B82F6;

  /* Typography */
  --font-primary: 'Inter', sans-serif;
  --font-secondary: 'Roboto', sans-serif;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 96px;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.15);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.2);
  --shadow-xl: 0 16px 50px rgba(0,0,0,0.3);
  --shadow-glow: 0 0 30px var(--primary-glow);

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
  --transition-spring: 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Layout */
  --max-width: 1280px;
  --header-height: 80px;
}

/* ============================================
   RESET & BASE
   ============================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-primary);
  background-color: var(--dark-900);
  color: var(--light-100);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

ul, ol {
  list-style: none;
}

button {
  border: none;
  cursor: pointer;
  font-family: inherit;
  font-size: inherit;
}

input, textarea {
  font-family: inherit;
  font-size: inherit;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* ============================================
   SCROLLBAR
   ============================================ */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--dark-800);
}

::-webkit-scrollbar-thumb {
  background: var(--dark-500);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--primary);
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-40px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(40px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes glow {
  0%, 100% { box-shadow: 0 0 20px var(--primary-glow); }
  50% { box-shadow: 0 0 40px var(--primary-glow), 0 0 60px rgba(232, 160, 25, 0.15); }
}

.animate-fadeInUp {
  animation: fadeInUp 0.6s ease forwards;
}

.animate-fadeIn {
  animation: fadeIn 0.5s ease forwards;
}

.animate-slideInLeft {
  animation: slideInLeft 0.6s ease forwards;
}

.animate-slideInRight {
  animation: slideInRight 0.6s ease forwards;
}

/* Intersection Observer animations */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ============================================
   HEADER & NAVIGATION
   ============================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  transition: all var(--transition-base);
  background: rgba(10, 10, 10, 0.6);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(232, 160, 25, 0.1);
}

.header.scrolled {
  background: rgba(10, 10, 10, 0.95);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.4);
  border-bottom-color: rgba(232, 160, 25, 0.2);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--primary);
  letter-spacing: -0.5px;
}

.logo-icon {
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: var(--white);
  box-shadow: 0 4px 15px rgba(232, 160, 25, 0.3);
}

.logo span {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Desktop Navigation */
.nav-desktop {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 16px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--light-100);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary);
  background: rgba(232, 160, 25, 0.08);
}

.nav-link.active {
  font-weight: 600;
}

.nav-link i {
  font-size: 0.75rem;
  transition: transform var(--transition-fast);
}

.nav-item:hover .nav-link i.fa-chevron-down {
  transform: rotate(180deg);
}

/* Dropdown */
.nav-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 220px;
  background: rgba(20, 20, 20, 0.98);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(232, 160, 25, 0.15);
  border-radius: var(--radius-md);
  padding: var(--space-sm) 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-xl);
}

.nav-item:hover .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-dropdown a {
  display: block;
  padding: 10px 20px;
  font-size: 0.85rem;
  color: var(--dark-100);
  transition: all var(--transition-fast);
}

.nav-dropdown a:hover {
  color: var(--primary);
  background: rgba(232, 160, 25, 0.08);
  padding-left: 24px;
}

/* Mobile menu button */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  background: transparent;
  cursor: pointer;
}

/* Mobile menu container (hidden on desktop) */
.nav-mobile {
  display: none;
}

.menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--light-100);
  border-radius: 2px;
  transition: all var(--transition-base);
}

.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

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

.menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Hotline button in header */
.header-hotline {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 8px 20px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: var(--white);
  font-weight: 600;
  font-size: 0.9rem;
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
  box-shadow: 0 4px 15px rgba(232, 160, 25, 0.3);
}

.header-hotline:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(232, 160, 25, 0.4);
}

.header-hotline i {
  animation: pulse 2s infinite;
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding-top: var(--header-height);
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(10, 10, 10, 0.92) 0%,
    rgba(10, 10, 10, 0.75) 40%,
    rgba(10, 10, 10, 0.6) 70%,
    rgba(10, 10, 10, 0.85) 100%
  );
}

/* Animated particles / embers effect */
.hero-particles {
  position: absolute;
  inset: 0;
  z-index: 1;
  overflow: hidden;
}

.particle {
  position: absolute;
  width: 4px;
  height: 4px;
  background: var(--primary);
  border-radius: 50%;
  opacity: 0;
  animation: particleFloat 8s infinite;
}

@keyframes particleFloat {
  0% {
    opacity: 0;
    transform: translateY(100vh) scale(0);
  }
  10% {
    opacity: 0.8;
  }
  90% {
    opacity: 0.3;
  }
  100% {
    opacity: 0;
    transform: translateY(-10vh) scale(1);
  }
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 800px;
  padding: var(--space-2xl);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 8px 20px;
  background: rgba(232, 160, 25, 0.12);
  border: 1px solid rgba(232, 160, 25, 0.3);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--primary);
  margin-bottom: var(--space-lg);
  animation: fadeInDown 0.6s ease;
}

.hero-badge i {
  font-size: 0.7rem;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: var(--space-lg);
  background: linear-gradient(135deg, var(--white) 0%, var(--light-200) 50%, var(--primary-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: fadeInUp 0.8s ease;
}

.hero-description {
  font-size: 1.1rem;
  color: var(--dark-200);
  line-height: 1.8;
  margin-bottom: var(--space-2xl);
  animation: fadeInUp 0.8s ease 0.2s backwards;
}

.hero-slogan {
  display: inline-block;
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--primary);
  font-style: italic;
  margin-bottom: var(--space-xl);
  animation: fadeInUp 0.8s ease 0.1s backwards;
}

.hero-actions {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease 0.3s backwards;
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 14px 32px;
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.1), transparent);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.btn:hover::before {
  opacity: 1;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: var(--white);
  box-shadow: 0 4px 20px rgba(232, 160, 25, 0.35);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(232, 160, 25, 0.5);
}

.btn-outline {
  background: transparent;
  color: var(--light-100);
  border: 2px solid rgba(255,255,255,0.2);
}

.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-3px);
  box-shadow: 0 4px 20px rgba(232, 160, 25, 0.2);
}

.btn-sm {
  padding: 10px 20px;
  font-size: 0.85rem;
}

.btn-lg {
  padding: 16px 40px;
  font-size: 1rem;
}

/* ============================================
   SECTION STYLES
   ============================================ */
.section {
  padding: var(--space-4xl) 0;
  position: relative;
}

.section-dark {
  background: var(--dark-800);
}

.section-gradient {
  background: linear-gradient(180deg, var(--dark-900) 0%, var(--dark-800) 50%, var(--dark-900) 100%);
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: var(--space-md);
}

.section-label::before,
.section-label::after {
  content: '';
  width: 30px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--primary));
}

.section-label::after {
  background: linear-gradient(90deg, var(--primary), transparent);
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: var(--space-md);
  color: var(--white);
}

.section-title .highlight {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--dark-200);
  max-width: 650px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ============================================
   HIGHLIGHTS / FEATURES
   ============================================ */
.highlights-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
}

.highlight-card {
  background: rgba(30, 30, 30, 0.6);
  border: 1px solid rgba(232, 160, 25, 0.1);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  text-align: center;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.highlight-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.highlight-card:hover {
  transform: translateY(-8px);
  border-color: rgba(232, 160, 25, 0.3);
  box-shadow: var(--shadow-glow);
}

.highlight-card:hover::before {
  transform: scaleX(1);
}

.highlight-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-md);
  background: linear-gradient(135deg, rgba(232, 160, 25, 0.15), rgba(255, 107, 44, 0.08));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--primary);
  transition: all var(--transition-base);
}

.highlight-card:hover .highlight-icon {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: var(--white);
  transform: scale(1.1) rotate(5deg);
}

.highlight-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
  color: var(--white);
}

.highlight-card p {
  font-size: 0.9rem;
  color: var(--dark-200);
  line-height: 1.6;
}

/* ============================================
   ABOUT SECTION
   ============================================ */
.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
}

.about-text h2 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: var(--space-lg);
  color: var(--white);
}

.about-text .about-slogan {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--primary);
  font-style: italic;
  margin-bottom: var(--space-lg);
  padding-left: var(--space-md);
  border-left: 3px solid var(--primary);
}

.about-text p {
  font-size: 1rem;
  color: var(--dark-200);
  line-height: 1.8;
  margin-bottom: var(--space-md);
}

.about-image {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.about-image img {
  width: 100%;
  height: 400px;
  object-fit: cover;
  border-radius: var(--radius-lg);
}

.about-image::after {
  content: '';
  position: absolute;
  inset: 0;
  border: 2px solid rgba(232, 160, 25, 0.2);
  border-radius: var(--radius-lg);
  pointer-events: none;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  margin-top: var(--space-xl);
}

.stat-item {
  text-align: center;
  padding: var(--space-md);
  background: rgba(232, 160, 25, 0.06);
  border-radius: var(--radius-md);
  border: 1px solid rgba(232, 160, 25, 0.1);
}

.stat-number {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--primary);
  display: block;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--dark-200);
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* ============================================
   PRODUCT SECTION
   ============================================ */
.product-tabs {
  display: flex;
  gap: var(--space-sm);
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: var(--space-2xl);
}

.product-tab {
  padding: 10px 24px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--dark-200);
  background: rgba(30, 30, 30, 0.6);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-base);
}

.product-tab:hover {
  color: var(--primary);
  border-color: rgba(232, 160, 25, 0.3);
}

.product-tab.active {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: var(--white);
  border-color: transparent;
  box-shadow: 0 4px 15px rgba(232, 160, 25, 0.3);
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-lg);
}

.product-card {
  background: rgba(20, 20, 20, 0.8);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
  cursor: pointer;
}

.product-card:hover {
  transform: translateY(-6px);
  border-color: rgba(232, 160, 25, 0.3);
  box-shadow: 0 12px 40px rgba(0,0,0,0.4);
}

.product-card-image {
  position: relative;
  height: 200px;
  overflow: hidden;
}

.product-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.product-card:hover .product-card-image img {
  transform: scale(1.08);
}

.product-card-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  padding: 4px 12px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: var(--white);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-full);
}

.product-card-body {
  padding: var(--space-lg);
}

.product-card-body h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: var(--space-sm);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.product-card-body p {
  font-size: 0.85rem;
  color: var(--dark-200);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: var(--space-md);
}

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

.product-card-link {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all var(--transition-fast);
}

.product-card-link:hover {
  gap: 10px;
}

/* ============================================
   NEWS / ARTICLES SECTION
   ============================================ */
.news-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: var(--space-lg);
}

.news-card {
  background: rgba(20, 20, 20, 0.8);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
}

.news-card:hover {
  transform: translateY(-4px);
  border-color: rgba(232, 160, 25, 0.2);
  box-shadow: 0 8px 30px rgba(0,0,0,0.3);
}

.news-card-image {
  height: 200px;
  overflow: hidden;
}

.news-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.news-card:hover .news-card-image img {
  transform: scale(1.05);
}

.news-card-body {
  padding: var(--space-lg);
}

.news-card-date {
  font-size: 0.8rem;
  color: var(--primary);
  font-weight: 500;
  margin-bottom: var(--space-sm);
  display: flex;
  align-items: center;
  gap: 6px;
}

.news-card-body h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: var(--space-sm);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: color var(--transition-fast);
}

.news-card:hover .news-card-body h3 {
  color: var(--primary);
}

.news-card-body p {
  font-size: 0.9rem;
  color: var(--dark-200);
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ============================================
   SERVICES SECTION
   ============================================ */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: var(--space-lg);
}

.service-card {
  display: flex;
  gap: var(--space-md);
  background: rgba(20, 20, 20, 0.6);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: all var(--transition-base);
  cursor: pointer;
}

.service-card:hover {
  border-color: rgba(232, 160, 25, 0.2);
  background: rgba(30, 30, 30, 0.8);
  transform: translateX(4px);
}

.service-card-icon {
  flex-shrink: 0;
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, rgba(232, 160, 25, 0.15), rgba(255, 107, 44, 0.08));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  font-size: 1.2rem;
}

.service-card h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: var(--space-xs);
  line-height: 1.4;
}

.service-card p {
  font-size: 0.85rem;
  color: var(--dark-200);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ============================================
   CTA / QUOTE SECTION
   ============================================ */
.cta-section {
  position: relative;
  padding: var(--space-4xl) 0;
  overflow: hidden;
}

.cta-bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--dark-800) 0%, var(--dark-700) 100%);
}

.cta-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, rgba(232, 160, 25, 0.08) 0%, transparent 70%);
}

.cta-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.cta-content h2 {
  font-size: 2rem;
  font-weight: 800;
  color: var(--white);
  margin-bottom: var(--space-md);
}

.cta-content p {
  font-size: 1.05rem;
  color: var(--dark-200);
  margin-bottom: var(--space-xl);
}

.cta-form {
  display: flex;
  gap: var(--space-sm);
  max-width: 500px;
  margin: 0 auto;
}

.cta-form input {
  flex: 1;
  padding: 14px 20px;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-sm);
  color: var(--white);
  font-size: 0.95rem;
  transition: all var(--transition-fast);
}

.cta-form input::placeholder {
  color: var(--dark-300);
}

.cta-form input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(232, 160, 25, 0.1);
}

/* ============================================
   CONTACT SECTION
   ============================================ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
}

.contact-info-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.contact-info-item {
  display: flex;
  gap: var(--space-md);
  align-items: flex-start;
}

.contact-info-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, rgba(232, 160, 25, 0.15), rgba(255, 107, 44, 0.08));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  font-size: 1.1rem;
}

.contact-info-item h4 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 4px;
}

.contact-info-item p {
  font-size: 0.9rem;
  color: var(--dark-200);
  line-height: 1.6;
}

.contact-info-item a {
  color: var(--primary);
  font-weight: 600;
}

.contact-info-item a:hover {
  text-decoration: underline;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--dark-100);
}

.form-group input,
.form-group textarea {
  padding: 12px 16px;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-sm);
  color: var(--white);
  transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(232, 160, 25, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  background: var(--dark-800);
  border-top: 1px solid rgba(232, 160, 25, 0.1);
  padding: var(--space-3xl) 0 var(--space-lg);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.footer-brand .logo {
  margin-bottom: var(--space-md);
}

.footer-brand p {
  font-size: 0.9rem;
  color: var(--dark-200);
  line-height: 1.7;
  margin-bottom: var(--space-md);
}

.footer-social {
  display: flex;
  gap: var(--space-sm);
}

.footer-social a {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-sm);
  color: var(--dark-200);
  transition: all var(--transition-base);
}

.footer-social a:hover {
  background: var(--primary);
  color: var(--white);
  border-color: var(--primary);
  transform: translateY(-3px);
}

.footer-column h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: var(--space-md);
  position: relative;
  padding-bottom: var(--space-sm);
}

.footer-column h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--primary);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer-links a {
  font-size: 0.9rem;
  color: var(--dark-200);
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 6px;
}

.footer-links a:hover {
  color: var(--primary);
  padding-left: 4px;
}

.footer-contact-item {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
  font-size: 0.9rem;
  color: var(--dark-200);
}

.footer-contact-item i {
  color: var(--primary);
  width: 16px;
  margin-top: 4px;
}

.footer-bottom {
  padding-top: var(--space-lg);
  border-top: 1px solid rgba(255,255,255,0.06);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--dark-300);
}

/* ============================================
   BREADCRUMB
   ============================================ */
.breadcrumb {
  padding: calc(var(--header-height) + var(--space-xl)) 0 var(--space-xl);
  background: linear-gradient(180deg, var(--dark-800), var(--dark-900));
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.9rem;
}

.breadcrumb-list a {
  color: var(--dark-200);
  transition: color var(--transition-fast);
}

.breadcrumb-list a:hover {
  color: var(--primary);
}

.breadcrumb-list .separator {
  color: var(--dark-400);
}

.breadcrumb-list .current {
  color: var(--primary);
  font-weight: 500;
}

/* ============================================
   PAGE CONTENT
   ============================================ */
.page-content {
  padding: var(--space-2xl) 0 var(--space-4xl);
}

.page-content h2 {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--white);
  margin-bottom: var(--space-lg);
}

.page-content p {
  font-size: 1rem;
  color: var(--dark-200);
  line-height: 1.8;
  margin-bottom: var(--space-md);
}

/* ============================================
   PRODUCT DETAIL MODAL
   ============================================ */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--dark-700);
  border: 1px solid rgba(232, 160, 25, 0.15);
  border-radius: var(--radius-xl);
  max-width: 700px;
  width: 90%;
  max-height: 85vh;
  overflow-y: auto;
  transform: scale(0.9) translateY(20px);
  transition: all var(--transition-base);
}

.modal-overlay.active .modal {
  transform: scale(1) translateY(0);
}

.modal-header {
  position: sticky;
  top: 0;
  background: var(--dark-700);
  padding: var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  z-index: 1;
}

.modal-close {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,0.06);
  border-radius: var(--radius-sm);
  color: var(--dark-200);
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: var(--error);
  color: var(--white);
}

.modal-body {
  padding: var(--space-lg);
}

.modal-image {
  width: 100%;
  height: 300px;
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: var(--space-lg);
}

.modal-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.modal-body h2 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: var(--space-md);
}

.modal-body p {
  font-size: 0.95rem;
  color: var(--dark-200);
  line-height: 1.8;
  margin-bottom: var(--space-lg);
}

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

.specs-table tr {
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.specs-table td {
  padding: 12px 16px;
  font-size: 0.9rem;
}

.specs-table td:first-child {
  color: var(--dark-200);
  font-weight: 500;
  width: 40%;
}

.specs-table td:last-child {
  color: var(--white);
  font-weight: 600;
}

.modal-cta {
  padding: var(--space-lg);
  border-top: 1px solid rgba(255,255,255,0.06);
  display: flex;
  gap: var(--space-md);
}

/* ============================================
   FLOATING ELEMENTS
   ============================================ */
.floating-phone {
  position: fixed;
  bottom: 30px;
  right: 30px;
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  align-items: flex-end;
}

.floating-btn {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  color: var(--white);
  transition: all var(--transition-base);
  box-shadow: var(--shadow-lg);
}

.floating-btn:hover {
  transform: scale(1.1);
}

.floating-phone-btn {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  animation: glow 3s infinite;
}

.floating-zalo-btn {
  background: linear-gradient(135deg, #0068FF, #0099FF);
}

.floating-fb-btn {
  background: linear-gradient(135deg, #1877F2, #42A5F5);
}

/* Back to top */
.back-to-top {
  position: fixed;
  bottom: 30px;
  left: 30px;
  z-index: 999;
  width: 44px;
  height: 44px;
  background: rgba(30, 30, 30, 0.9);
  border: 1px solid rgba(232, 160, 25, 0.2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--primary);
  color: var(--white);
  transform: translateY(-3px);
}

/* ============================================
   LOADING
   ============================================ */
.page-loader {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: var(--dark-900);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  transition: opacity 0.5s ease;
}

.page-loader.hidden {
  opacity: 0;
  pointer-events: none;
}

.loader-spinner {
  width: 48px;
  height: 48px;
  border: 3px solid rgba(232, 160, 25, 0.2);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.loader-text {
  font-size: 0.9rem;
  color: var(--dark-200);
}

/* ============================================
   ARTICLE DETAIL
   ============================================ */
.article-detail {
  max-width: 800px;
  margin: 0 auto;
}

.article-detail h1 {
  font-size: 2rem;
  font-weight: 800;
  color: var(--white);
  margin-bottom: var(--space-md);
  line-height: 1.3;
}

.article-meta {
  display: flex;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
  font-size: 0.85rem;
  color: var(--dark-200);
}

.article-content {
  font-size: 1.05rem;
  color: var(--dark-100);
  line-height: 1.9;
}

.article-content p {
  margin-bottom: var(--space-md);
}

.article-image {
  width: 100%;
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: var(--space-xl);
}

.article-image img {
  width: 100%;
  height: 400px;
  object-fit: cover;
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 1024px) {
  .highlights-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .about-content {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .contact-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }

  .nav-desktop {
    display: none;
  }

  .header-hotline {
    display: none;
  }

  .menu-toggle {
    display: flex;
  }

  /* Mobile nav */
  .nav-mobile {
    display: block;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 10, 10, 0.98);
    backdrop-filter: blur(20px);
    padding: var(--space-lg);
    transform: translateX(100%);
    transition: transform var(--transition-base);
    overflow-y: auto;
    z-index: 999;
  }

  .nav-mobile.active {
    transform: translateX(0);
  }

  .nav-mobile .nav-link {
    padding: 14px 0;
    font-size: 1rem;
    border-bottom: 1px solid rgba(255,255,255,0.06);
  }

  .nav-mobile .nav-dropdown {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    background: transparent;
    border: none;
    box-shadow: none;
    padding-left: var(--space-md);
  }

  .nav-mobile .mobile-hotline {
    display: flex;
    margin-top: var(--space-lg);
  }

  .highlights-grid {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: 1.8rem;
  }

  .hero-content {
    padding: var(--space-lg);
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .products-grid {
    grid-template-columns: 1fr;
  }

  .news-grid {
    grid-template-columns: 1fr;
  }

  .services-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .cta-form {
    flex-direction: column;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-sm);
    text-align: center;
  }

  .floating-phone {
    bottom: 20px;
    right: 20px;
  }

  .back-to-top {
    bottom: 20px;
    left: 20px;
  }

  .product-tabs {
    justify-content: flex-start;
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: var(--space-sm);
    -webkit-overflow-scrolling: touch;
  }

  .product-tab {
    white-space: nowrap;
    flex-shrink: 0;
  }

  .about-stats {
    grid-template-columns: 1fr;
  }

  .modal {
    width: 95%;
    max-height: 90vh;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-md);
  }

  .section {
    padding: var(--space-2xl) 0;
  }

  .section-title {
    font-size: 1.5rem;
  }
}