/* ==========================================================================
   MINHIT.COM - MODERN DESIGN SYSTEM & STYLES (LIGHT / DARK THEME)
   Author: Mike Trần Portfolio & Academy
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&family=Space+Grotesk:wght@500;700&display=swap');

:root {
  /* Color Palette - Dark Mode (Default) */
  --bg-primary: #0a0d14;
  --bg-secondary: #101622;
  --bg-card: rgba(18, 24, 38, 0.75);
  --bg-card-hover: rgba(26, 35, 54, 0.85);
  --bg-glass: rgba(255, 255, 255, 0.03);
  --border-glass: rgba(255, 255, 255, 0.08);
  --border-glass-hover: rgba(59, 130, 246, 0.4);
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --accent-blue: #3b82f6;
  --accent-cyan: #06b6d4;
  --accent-purple: #8b5cf6;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  
  --gradient-brand: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 50%, #06b6d4 100%);
  --gradient-glow: radial-gradient(circle at 50% 50%, rgba(59, 130, 246, 0.15) 0%, transparent 70%);
  --gradient-card: linear-gradient(145deg, rgba(255, 255, 255, 0.05) 0%, rgba(255, 255, 255, 0.01) 100%);
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.35);
  --shadow-glow: 0 0 40px rgba(59, 130, 246, 0.25);
  
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 9999px;
  
  --font-main: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-display: 'Space Grotesk', sans-serif;
  
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-hover: rgba(255, 255, 255, 0.98);
  --bg-glass: rgba(0, 0, 0, 0.02);
  --border-glass: rgba(0, 0, 0, 0.08);
  --border-glass-hover: rgba(59, 130, 246, 0.5);
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  
  --gradient-glow: radial-gradient(circle at 50% 50%, rgba(59, 130, 246, 0.08) 0%, transparent 70%);
  --gradient-card: linear-gradient(145deg, rgba(255, 255, 255, 0.9) 0%, rgba(241, 245, 249, 0.7) 100%);
  --shadow-md: 0 8px 30px rgba(148, 163, 184, 0.2);
  --shadow-glow: 0 0 35px rgba(59, 130, 246, 0.15);
}

/* ==========================================================================
   RESET & BASE STYLES
   ========================================================================== */
*, *::before, *::after {
  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-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color var(--transition-smooth), color var(--transition-smooth);
  position: relative;
}

/* Background Ambient Glows */
.ambient-glow-1 {
  position: fixed;
  top: -15vw;
  left: -10vw;
  width: 50vw;
  height: 50vw;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.15) 0%, transparent 70%);
  filter: blur(80px);
  z-index: -1;
  pointer-events: none;
  animation: floatOrb 20s ease-in-out infinite alternate;
}

.ambient-glow-2 {
  position: fixed;
  bottom: 5vw;
  right: -10vw;
  width: 45vw;
  height: 45vw;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.12) 0%, transparent 70%);
  filter: blur(80px);
  z-index: -1;
  pointer-events: none;
  animation: floatOrb 25s ease-in-out infinite alternate-reverse;
}

@keyframes floatOrb {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(50px, 40px) scale(1.1); }
}

/* Container */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Typography */
h1, h2, h3, h4, .font-display {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.gradient-text {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ==========================================================================
   HEADER & NAVBAR
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1rem 0;
  transition: all var(--transition-smooth);
}

.site-header.scrolled {
  padding: 0.6rem 0;
  background: rgba(10, 13, 20, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-glass);
}

[data-theme="light"] .site-header.scrolled {
  background: rgba(255, 255, 255, 0.85);
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-primary);
}

.brand-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--accent-blue);
  box-shadow: 0 0 12px rgba(59, 130, 246, 0.3);
}

.brand-name {
  font-size: 1.25rem;
  font-weight: 700;
  font-family: var(--font-display);
}

.brand-badge {
  font-size: 0.7rem;
  background: rgba(59, 130, 246, 0.15);
  color: var(--accent-blue);
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
  border: 1px solid rgba(59, 130, 246, 0.3);
  font-weight: 600;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  list-style: none;
}

.nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color var(--transition-fast);
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.4rem 0;
}

.nav-link:hover, .nav-link.active {
  color: var(--text-primary);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-brand);
  border-radius: var(--radius-full);
}

/* Navigation Dropdown */
.nav-item-dropdown {
  position: relative;
}

.nav-dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  left: -10px;
  min-width: 250px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-glass-hover);
  border-radius: var(--radius-md);
  padding: 0.5rem;
  list-style: none;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition-fast);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  z-index: 200;
}

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

.dropdown-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 0.85rem;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.dropdown-link:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
}

.dropdown-link i {
  font-size: 0.95rem;
  color: var(--accent-blue);
  width: 18px;
  text-align: center;
}

.dropdown-link .ext-icon {
  margin-left: auto;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Theme Toggle Button */
.theme-toggle-btn {
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-glass-hover);
  transform: rotate(15deg);
}

/* Mobile Toggle */
.mobile-menu-btn {
  display: none;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

/* ==========================================================================
   BUTTONS & BADGES
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-smooth);
  border: none;
}

.btn-primary {
  background: var(--gradient-brand);
  color: #ffffff;
  box-shadow: 0 4px 20px rgba(59, 130, 246, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(59, 130, 246, 0.5);
}

.btn-secondary {
  background: var(--bg-glass);
  color: var(--text-primary);
  border: 1px solid var(--border-glass);
  backdrop-filter: blur(10px);
}

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

.btn-sm {
  padding: 0.45rem 1rem;
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.9rem;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.25);
  color: var(--accent-emerald);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
}

.status-dot {
  width: 8px;
  height: 8px;
  background-color: var(--accent-emerald);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--accent-emerald);
  animation: pulseDot 2s infinite;
}

@keyframes pulseDot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.8); }
}

/* ==========================================================================
   HERO SECTION
   ========================================================================== */
.hero-section {
  padding: 8.5rem 0 4.5rem;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 3.5rem;
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.hero-title {
  font-size: 3.25rem;
  line-height: 1.15;
  font-weight: 800;
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 580px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

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

.stat-item h4 {
  font-size: 1.85rem;
  font-weight: 700;
  color: var(--text-primary);
  font-family: var(--font-display);
}

.stat-item p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
}

.hero-avatar-card {
  position: relative;
  width: 100%;
  max-width: 380px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-smooth);
}

.hero-avatar-card:hover {
  transform: translateY(-6px) scale(1.02);
  border-color: var(--border-glass-hover);
  box-shadow: var(--shadow-glow);
}

.hero-avatar-card img {
  width: 100%;
  height: 440px;
  object-fit: cover;
  object-position: center top;
  display: block;
}

/* ==========================================================================
   HERO CERTIFICATE SLIDER (GA4, GOOGLE SEARCH, GEMINI EDUCATOR)
   ========================================================================== */
.hero-cert-slider {
  position: absolute;
  bottom: 1.25rem;
  left: 0.9rem;
  right: 0.9rem;
  background: rgba(10, 13, 20, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem 0.6rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  cursor: pointer;
  transition: all var(--transition-smooth);
  z-index: 10;
  overflow: hidden;
}

[data-theme="light"] .hero-cert-slider {
  background: rgba(255, 255, 255, 0.94);
  border-color: rgba(0, 0, 0, 0.12);
  box-shadow: 0 10px 30px rgba(148, 163, 184, 0.35);
}

.hero-cert-slider:hover {
  border-color: var(--accent-blue);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

.cert-slides-track {
  position: relative;
  min-height: 64px;
}

.cert-slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  display: flex;
  align-items: center;
  gap: 0.85rem;
  opacity: 0;
  visibility: hidden;
  transform: translateX(18px);
  transition: opacity 0.45s ease, transform 0.45s ease, visibility 0.45s;
  pointer-events: none;
}

.cert-slide.active {
  position: relative;
  opacity: 1;
  visibility: visible;
  transform: translateX(0);
  pointer-events: auto;
}

.cert-icon-box {
  width: 50px;
  height: 50px;
  min-width: 50px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-glass);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 4px;
}

[data-theme="light"] .cert-icon-box {
  background: #f1f5f9;
}

.cert-icon-box img.cert-icon {
  width: 100%;
  height: 100%;
  object-fit: contain;
  transition: transform 0.3s ease;
}

.hero-cert-slider:hover .cert-icon-box img.cert-icon {
  transform: scale(1.1);
}

.cert-info {
  flex-grow: 1;
  overflow: hidden;
}

.cert-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--accent-cyan);
  background: rgba(6, 182, 212, 0.12);
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
  margin-bottom: 0.2rem;
}

.badge-text-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1.25;
}

.badge-text-sub {
  font-size: 0.75rem;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.cert-zoom-btn {
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  color: var(--text-muted);
  width: 30px;
  height: 30px;
  min-width: 30px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.cert-zoom-btn:hover {
  background: var(--accent-blue);
  color: #fff;
  border-color: var(--accent-blue);
}

/* Slider Controls (Dots & Arrows) */
.cert-slider-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 0.5rem;
  padding-top: 0.4rem;
  border-top: 1px solid var(--border-glass);
}

.cert-dots {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.cert-dot {
  width: 18px;
  height: 4px;
  border-radius: var(--radius-full);
  background: var(--border-glass);
  cursor: pointer;
  transition: all 0.3s ease;
}

.cert-dot.active {
  width: 28px;
  background: var(--accent-blue);
  box-shadow: 0 0 8px var(--accent-blue);
}

.cert-arrow-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.75rem;
  padding: 2px 6px;
  border-radius: 4px;
  transition: color var(--transition-fast);
}

.cert-arrow-btn:hover {
  color: var(--text-primary);
}

/* Lightbox Modal */
.cert-lightbox-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border-glass-hover);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 680px;
  padding: 2rem;
  box-shadow: var(--shadow-glow);
  position: relative;
  text-align: center;
}

.cert-lightbox-img {
  max-width: 100%;
  max-height: 520px;
  object-fit: contain;
  border-radius: var(--radius-md);
  margin: 1rem 0;
  border: 1px solid var(--border-glass);
  background: rgba(0, 0, 0, 0.4);
}

.section-container {
  scroll-margin-top: 80px;
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 3rem;
}

.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-blue);
  background: rgba(59, 130, 246, 0.1);
  padding: 0.3rem 0.8rem;
  border-radius: var(--radius-full);
  margin-bottom: 0.8rem;
}

.section-title {
  font-size: 2.25rem;
  margin-bottom: 0.8rem;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 1rem;
}

.bento-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: auto auto;
  gap: 1.5rem;
  margin-bottom: 4rem;
}

.bento-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: all var(--transition-smooth);
}

.bento-card:hover {
  border-color: var(--border-glass-hover);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.bento-card-bg-glow {
  position: absolute;
  top: -50px;
  right: -50px;
  width: 150px;
  height: 150px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.2) 0%, transparent 70%);
  filter: blur(30px);
  z-index: 0;
  pointer-events: none;
}

.bento-icon-wrapper {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: rgba(59, 130, 246, 0.15);
  color: var(--accent-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  margin-bottom: 0.85rem;
}

.bento-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
  position: relative;
  z-index: 1;
}

.bento-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  position: relative;
  z-index: 1;
  line-height: 1.55;
}

/* Bento Sizing Rules */
.bento-col-2 {
  grid-column: span 2;
}

.bento-col-3 {
  grid-column: span 3;
}

/* Featured Bento Card (Google Ads) */
.bento-featured {
  background: linear-gradient(145deg, rgba(59, 130, 246, 0.12) 0%, rgba(139, 92, 246, 0.08) 100%);
  border: 1px solid rgba(59, 130, 246, 0.3);
}

.bento-stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.85rem;
  margin-top: 1.5rem;
  z-index: 1;
}

.bento-stat-box {
  background: rgba(0, 0, 0, 0.35);
  padding: 0.75rem 0.6rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-glass);
  text-align: center;
}

[data-theme="light"] .bento-stat-box {
  background: rgba(255, 255, 255, 0.75);
}

.bento-stat-box .num {
  font-size: 1.35rem;
  font-weight: 700;
  font-family: var(--font-display);
  color: var(--accent-cyan);
  display: block;
  line-height: 1.2;
}

.bento-stat-box .lbl {
  font-size: 0.75rem;
  color: var(--text-secondary);
  display: block;
  margin-top: 4px;
  line-height: 1.35;
}

/* ==========================================================================
   COURSES & SERVICES
   ========================================================================== */
.courses-section {
  padding: 4rem 0;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

.course-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-smooth);
}

.course-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-glass-hover);
  box-shadow: var(--shadow-md);
}

.course-banner {
  position: relative;
  height: 180px;
  overflow: hidden;
}

.course-banner img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.course-card:hover .course-banner img {
  transform: scale(1.06);
}

.course-tag-overlay {
  position: absolute;
  top: 1rem;
  left: 1rem;
  background: rgba(10, 13, 20, 0.8);
  backdrop-filter: blur(8px);
  color: var(--accent-cyan);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.course-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
  justify-content: space-between;
  gap: 1rem;
}

.course-title {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.35;
}

.course-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.course-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.course-features li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.course-features li i {
  color: var(--accent-emerald);
}

.course-footer {
  padding-top: 1rem;
  border-top: 1px solid var(--border-glass);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.course-price {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  font-family: var(--font-display);
}

/* ==========================================================================
   BLOG PREVIEW SECTION
   ========================================================================== */
.blog-preview-section {
  padding: 4rem 0;
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.75rem;
  margin-bottom: 2.5rem;
}

.post-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-smooth);
  cursor: pointer;
}

.post-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-glass-hover);
  box-shadow: var(--shadow-md);
}

.post-thumb {
  height: 170px;
  overflow: hidden;
  position: relative;
}

.post-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.post-card:hover .post-thumb img {
  transform: scale(1.05);
}

.post-card-body {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
  gap: 0.6rem;
}

.post-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.post-card-title {
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--text-primary);
}

.post-card-excerpt {
  font-size: 0.85rem;
  color: var(--text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ==========================================================================
   CONTACT & MODAL
   ========================================================================== */
.contact-section {
  padding: 4rem 0 6rem;
}

.contact-card {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.15) 0%, rgba(139, 92, 246, 0.1) 100%);
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: var(--radius-lg);
  padding: 3.5rem 2rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.contact-title {
  font-size: 2.25rem;
  margin-bottom: 1rem;
}

.contact-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 2rem;
}

.contact-buttons {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Modal */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-smooth);
}

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

.modal-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border-glass-hover);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 540px;
  padding: 2rem;
  box-shadow: var(--shadow-glow);
  position: relative;
  transform: scale(0.95) translateY(20px);
  transition: transform var(--transition-smooth);
}

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

.modal-close-btn {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  color: var(--text-secondary);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.modal-close-btn:hover {
  color: var(--text-primary);
  background: var(--bg-card-hover);
}

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

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
  color: var(--text-primary);
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--bg-primary);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.95rem;
  outline: none;
  transition: border-color var(--transition-fast);
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

/* ==========================================================================
   FOOTER (4-COLUMN RICH RESPONSIVE DESIGN)
   ========================================================================== */
.site-footer {
  padding: 4rem 0 2rem;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-glass);
  position: relative;
  overflow: hidden;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: 2.5rem;
}

@media (max-width: 992px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
}

@media (max-width: 576px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.footer-bio {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 320px;
}

.footer-socials {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-top: 0.25rem;
}

.social-icon, .social-link {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border-glass-hover);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.social-icon:hover, .social-link:hover {
  background: var(--bg-card-hover);
  color: var(--accent-blue);
  border-color: var(--accent-blue);
  transform: translateY(-2px);
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.footer-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.01em;
  margin-bottom: 0.25rem;
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.footer-links li {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color var(--transition-fast), transform var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.footer-links li a:hover {
  color: var(--accent-blue);
  transform: translateX(3px);
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid var(--border-glass);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
}

/* ==========================================================================
   FLOATING ACTION BUTTONS (HOTLINE & ZALO)
   ========================================================================== */
.floating-actions {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  z-index: 90;
}

.floating-btn {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  text-decoration: none;
  font-size: 1.4rem;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.floating-btn:hover {
  transform: scale(1.1);
  box-shadow: var(--shadow-glow);
}

.floating-zalo {
  background: #0068ff;
  font-weight: 700;
  font-size: 0.85rem;
}

.floating-phone {
  background: #10b981;
}

/* ==========================================================================
   RESPONSIVE DESIGN
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
    text-align: center;
  }
  .hero-content {
    align-items: center;
  }
  .hero-cta-group {
    justify-content: center;
  }
  .hero-stats {
    width: 100%;
    max-width: 500px;
  }
  .bento-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .bento-col-2 {
    grid-column: span 2;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .mobile-menu-btn {
    display: block;
  }
  .hero-title {
    font-size: 2.4rem;
  }
  .bento-grid {
    grid-template-columns: 1fr;
    grid-auto-rows: auto;
  }
  .bento-col-2, .bento-row-2 {
    grid-column: span 1;
    grid-row: span 1;
  }
  .footer-wrapper {
    flex-direction: column;
    text-align: center;
  }
}