/* ==========================================================================
   THE GIOI CONG NGHE - VERCEL STYLE DESIGN SYSTEM
   ========================================================================== */

:root {
  --bg-main: #000000;
  --bg-surface: #0a0a0c;
  --bg-card: rgba(18, 18, 22, 0.7);
  --bg-card-hover: rgba(28, 28, 35, 0.85);
  
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.2);
  --border-glow: rgba(0, 112, 243, 0.4);

  --text-primary: #ededed;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;

  --accent-blue: #0070f3;
  --accent-cyan: #00dfd8;
  --accent-purple: #7928ca;
  --accent-pink: #ff0080;
  --accent-green: #10b981;
  --accent-amber: #f59e0b;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-display: 'Space Grotesk', var(--font-sans);

  --container-max: 1200px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-smooth: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  color-scheme: dark;
}

body {
  background-color: var(--bg-main);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  -webkit-font-smoothing: antialiased;
}

/* Background Glowing Elements */
.glow-bg {
  position: absolute;
  pointer-events: none;
  z-index: 0;
  filter: blur(120px);
  border-radius: 50%;
  opacity: 0.45;
}
.top-glow {
  top: -150px;
  left: 50%;
  transform: translateX(-50%);
  width: 700px;
  height: 400px;
  background: radial-gradient(circle, rgba(0, 112, 243, 0.35) 0%, rgba(121, 40, 202, 0.2) 70%, transparent 100%);
}
.center-glow {
  top: 900px;
  right: -100px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(255, 0, 128, 0.15) 0%, rgba(0, 223, 216, 0.1) 70%, transparent 100%);
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
  position: relative;
  z-index: 1;
}

/* Top ribbon banner */
.top-banner {
  background: linear-gradient(90deg, rgba(121, 40, 202, 0.25), rgba(0, 112, 243, 0.25));
  border-bottom: 1px solid var(--border-subtle);
  padding: 10px 0;
  font-size: 0.85rem;
  color: var(--text-secondary);
}
.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.banner-badge {
  background: var(--accent-purple);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: var(--radius-full);
  letter-spacing: 0.5px;
}
.banner-text strong {
  color: #fff;
}
.banner-link {
  color: var(--accent-cyan);
  text-decoration: none;
  font-weight: 600;
  transition: color var(--transition-fast);
}
.banner-link:hover {
  color: #fff;
}

/* Navbar */
.navbar-wrapper {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  background: rgba(0, 0, 0, 0.75);
  border-bottom: 1px solid var(--border-subtle);
}
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: #fff;
}
.logo-icon {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 4px 15px rgba(0, 112, 243, 0.3);
}
.logo-text {
  display: flex;
  flex-direction: column;
}
.logo-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: 0.5px;
  line-height: 1.1;
}
.logo-sub {
  font-size: 0.72rem;
  color: var(--text-muted);
  letter-spacing: 0.3px;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}
.nav-item {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  transition: color var(--transition-fast);
}
.nav-item:hover {
  color: #fff;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 18px;
}
.status-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.25);
  padding: 6px 12px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-green);
}
.pulse-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent-green);
  box-shadow: 0 0 8px var(--accent-green);
  animation: pulseAnim 2s infinite;
}
@keyframes pulseAnim {
  0% { transform: scale(0.95); opacity: 0.8; }
  50% { transform: scale(1.3); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.8; }
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}
.mobile-menu-btn span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--transition-fast);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  cursor: pointer;
  border: 1px solid transparent;
}
.btn-sm {
  padding: 8px 16px;
  font-size: 0.85rem;
}
.btn-lg {
  padding: 14px 28px;
  font-size: 0.95rem;
}
.btn-primary {
  background: #ffffff;
  color: #000000;
}
.btn-primary:hover {
  background: #e6e6e6;
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(255, 255, 255, 0.2);
}
.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  border-color: var(--border-subtle);
}
.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

/* Hero Section */
.hero-section {
  padding: 100px 24px 80px;
  text-align: center;
}
.hero-content {
  max-width: 860px;
  margin: 0 auto;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  padding: 6px 18px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 28px;
  backdrop-filter: blur(10px);
}
.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 5.5vw, 4.2rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -1.5px;
  margin-bottom: 24px;
}
.gradient-text {
  background: linear-gradient(135deg, #ffffff 20%, #a1a1aa 70%, #0070f3 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-desc {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  line-height: 1.65;
  max-width: 680px;
  margin: 0 auto 36px;
}
.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 60px;
}

/* Metrics bar */
.metrics-strip {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  padding: 24px 32px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(16px);
  margin-top: 20px;
}
.metric-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.metric-num {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.5px;
}
.metric-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.8px;
}
.metric-divider {
  width: 1px;
  height: 36px;
  background: var(--border-subtle);
}

/* Sections Global */
.section {
  padding: 90px 24px;
}
.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 50px;
}
.section-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-blue);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 12px;
}
.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 700;
  letter-spacing: -0.8px;
  margin-bottom: 14px;
}
.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Interactive Model Lookup */
.search-box-wrapper {
  max-width: 780px;
  margin: 0 auto 40px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.search-input-box {
  position: relative;
  display: flex;
  align-items: center;
}
.search-icon {
  position: absolute;
  left: 20px;
  color: var(--text-muted);
  pointer-events: none;
}
.search-input-box input {
  width: 100%;
  padding: 18px 50px 18px 54px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  font-size: 1rem;
  color: #fff;
  font-family: var(--font-sans);
  outline: none;
  transition: all var(--transition-fast);
  backdrop-filter: blur(12px);
}
.search-input-box input:focus {
  border-color: var(--accent-blue);
  background: rgba(255, 255, 255, 0.07);
  box-shadow: 0 0 25px rgba(0, 112, 243, 0.25);
}
.clear-search-btn {
  position: absolute;
  right: 18px;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.4rem;
  cursor: pointer;
  display: none;
}
.clear-search-btn.active {
  display: block;
}
.search-filter-pills {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
}
.pill {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 8px 18px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}
.pill:hover, .pill.active {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.25);
}
.pill.active {
  background: #fff;
  color: #000;
}

/* Models Grid */
.models-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.model-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: all var(--transition-fast);
  backdrop-filter: blur(12px);
}
.model-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}
.model-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.model-badge {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  text-transform: uppercase;
}
.badge-viettel { background: rgba(239, 68, 68, 0.15); color: #f87171; border: 1px solid rgba(239, 68, 68, 0.3); }
.badge-fpt { background: rgba(245, 158, 11, 0.15); color: #fbbf24; border: 1px solid rgba(245, 158, 11, 0.3); }
.badge-generic { background: rgba(59, 130, 246, 0.15); color: #60a5fa; border: 1px solid rgba(59, 130, 246, 0.3); }

.model-name {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
}
.model-spec-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}
.spec-row {
  display: flex;
  justify-content: space-between;
}
.spec-label { color: var(--text-muted); }
.spec-value { font-weight: 500; color: #e4e4e7; }
.model-footer {
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.status-pill-ok {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-green);
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Bento Grid */
.bento-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.bento-col-2 {
  grid-column: span 2;
}
.bento-row-2 {
  grid-row: span 2;
}
.bento-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 36px;
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: all var(--transition-smooth);
  backdrop-filter: blur(16px);
}
.bento-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.6);
}
.card-icon-badge {
  width: 50px;
  height: 50px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 8px;
}
.icon-purple { background: rgba(121, 40, 202, 0.2); color: #a855f7; border: 1px solid rgba(121, 40, 202, 0.3); }
.icon-blue { background: rgba(0, 112, 243, 0.2); color: #38bdf8; border: 1px solid rgba(0, 112, 243, 0.3); }
.icon-green { background: rgba(16, 185, 129, 0.2); color: #34d399; border: 1px solid rgba(16, 185, 129, 0.3); }
.icon-amber { background: rgba(245, 158, 11, 0.2); color: #fbbf24; border: 1px solid rgba(245, 158, 11, 0.3); }
.icon-rose { background: rgba(244, 63, 94, 0.2); color: #fb7185; border: 1px solid rgba(244, 63, 94, 0.3); }

.card-tag {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--text-muted);
}
.card-title {
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: -0.4px;
  color: #fff;
}
.card-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
}
.card-feature-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 10px 0;
}
.feature-bullet {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: #e4e4e7;
}
.bullet-check {
  color: var(--accent-green);
  font-weight: 800;
}

.card-mockup-preview {
  margin-top: auto;
  padding-top: 24px;
}
.mockup-tv-frame {
  background: #000;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.6);
  transition: border-color var(--transition-smooth), transform var(--transition-smooth);
}
.mockup-tv-frame:hover {
  border-color: rgba(255, 255, 255, 0.25);
  transform: translateY(-2px);
}
.mockup-header {
  background: #111;
  padding: 10px 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid var(--border-subtle);
}
.dot { width: 10px; height: 10px; border-radius: 50%; display: inline-block; }
.dot.red { background: #ff5f56; }
.dot.yellow { background: #ffbd2e; }
.dot.green { background: #27c93f; }
.mockup-title {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-left: 10px;
  font-family: monospace;
}
.mockup-img-container {
  position: relative;
  overflow: hidden;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #050507;
}
.mockup-screen-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.5s ease;
}
.mockup-tv-frame:hover .mockup-screen-img {
  transform: scale(1.03);
}
.mockup-img-badge {
  position: absolute;
  bottom: 12px;
  right: 12px;
  background: rgba(0, 0, 0, 0.78);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.18);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
}

/* Curated App Card Banner */
.card-app-banner {
  position: relative;
  margin-top: auto;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-subtle);
  aspect-ratio: 16 / 9;
  background: #050507;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
  transition: border-color var(--transition-smooth), transform var(--transition-smooth);
}
.card-app-banner:hover {
  border-color: rgba(245, 158, 11, 0.4);
  transform: translateY(-2px);
}
.app-banner-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.5s ease;
}
.card-app-banner:hover .app-banner-img {
  transform: scale(1.04);
}
.app-banner-overlay {
  position: absolute;
  bottom: 10px;
  left: 10px;
  right: 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.app-badge-tag {
  background: rgba(15, 23, 42, 0.88);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(245, 158, 11, 0.4);
  color: #fbbf24;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.6);
}

/* Old mockup-screen compatibility */
.mockup-screen {
  background: #000;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}
.mockup-body {
  padding: 18px;
  font-family: monospace;
  font-size: 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 6px;
  color: #38bdf8;
}

/* Steps Grid */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  position: relative;
  transition: all var(--transition-fast);
}
.step-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
}
.step-num {
  font-family: var(--font-display);
  font-size: 2.8rem;
  font-weight: 800;
  color: rgba(255, 255, 255, 0.12);
  line-height: 1;
}
.step-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
}
.step-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* FAQ */
.faq-accordion {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}
.faq-item:hover {
  border-color: var(--border-hover);
}
.faq-question {
  width: 100%;
  padding: 22px 24px;
  background: none;
  border: none;
  color: #fff;
  font-family: var(--font-sans);
  font-size: 1.02rem;
  font-weight: 600;
  text-align: left;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  gap: 16px;
}
.faq-arrow {
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--text-muted);
  transition: transform var(--transition-fast);
}
.faq-item.active .faq-arrow {
  transform: rotate(45deg);
  color: #fff;
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  padding: 0 24px;
}
.faq-answer p {
  padding-bottom: 22px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.65;
}

/* CTA Banner */
.cta-banner {
  background: linear-gradient(135deg, rgba(0, 112, 243, 0.15) 0%, rgba(121, 40, 202, 0.2) 100%);
  border: 1px solid rgba(0, 112, 243, 0.3);
  border-radius: var(--radius-lg);
  padding: 60px 40px;
  text-align: center;
  margin: 60px auto 100px;
  position: relative;
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(0, 112, 243, 0.15);
}
.cta-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 800;
  margin-bottom: 16px;
  color: #fff;
}
.cta-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 620px;
  margin: 0 auto 32px;
}
.cta-btn-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* Footer */
.footer-wrapper {
  background: #050507;
  border-top: 1px solid var(--border-subtle);
  padding: 80px 0 40px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 60px;
}
.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.footer-tagline {
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.65;
  max-width: 400px;
}
.footer-links-col {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.col-title {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  color: #fff;
  text-transform: uppercase;
  letter-spacing: 0.8px;
}
.footer-links-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-links-col a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}
.footer-links-col a:hover {
  color: #fff;
}
.footer-bottom {
  padding-top: 30px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.82rem;
  color: var(--text-muted);
}
.footer-badge {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 992px) {
  .bento-grid {
    grid-template-columns: 1fr;
  }
  .bento-col-2, .bento-row-2 {
    grid-column: span 1;
    grid-row: span 1;
  }
  .steps-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .video-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .mobile-menu-btn {
    display: flex;
  }
  .nav-links.active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 72px;
    left: 0;
    width: 100%;
    background: #000;
    border-bottom: 1px solid var(--border-subtle);
    padding: 24px;
    gap: 18px;
  }
  .metrics-strip {
    flex-direction: column;
    gap: 20px;
  }
  .metric-divider {
    width: 60px;
    height: 1px;
  }
  .video-action-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
}

/* ==========================================================================
   VIDEO SHOWCASE COMPONENT
   ========================================================================== */

.btn-pulse-glow {
  box-shadow: 0 0 25px rgba(0, 112, 243, 0.45);
  animation: pulseGlow 2.5s infinite ease-in-out;
}

@keyframes pulseGlow {
  0%, 100% {
    box-shadow: 0 0 20px rgba(0, 112, 243, 0.4);
  }
  50% {
    box-shadow: 0 0 35px rgba(0, 223, 216, 0.7);
  }
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
}
.btn-ghost:hover {
  color: var(--text-primary);
  border-color: var(--border-hover);
  background: rgba(255, 255, 255, 0.05);
}

.video-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
  margin-top: 10px;
}

.video-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: transform var(--transition-smooth), border-color var(--transition-smooth), box-shadow var(--transition-smooth);
}

.video-card:hover {
  transform: translateY(-5px);
  border-color: rgba(255, 255, 255, 0.22);
  box-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.8), 0 0 30px rgba(0, 112, 243, 0.15);
}

.video-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 20px;
  background: rgba(255, 255, 255, 0.02);
  border-bottom: 1px solid var(--border-subtle);
}

.video-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  padding: 4px 10px;
  border-radius: var(--radius-full);
}

.badge-flash {
  color: #38bdf8;
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.25);
}

.badge-ai {
  color: #c084fc;
  background: rgba(192, 132, 252, 0.12);
  border: 1px solid rgba(192, 132, 252, 0.25);
}

.pulse-dot-red {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #ef4444;
  box-shadow: 0 0 8px #ef4444;
  animation: pulseDot 1.6s infinite ease-in-out;
}

@keyframes pulseDot {
  0%, 100% {
    transform: scale(0.9);
    opacity: 0.8;
  }
  50% {
    transform: scale(1.25);
    opacity: 1;
    box-shadow: 0 0 12px #ef4444;
  }
}

.video-duration-tag {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
}

.video-embed-container {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%; /* 16:9 Aspect Ratio */
  background: #050507;
}

.video-embed-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.video-card-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.video-card-title {
  font-size: 1.22rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
  line-height: 1.4;
  letter-spacing: -0.01em;
}

.video-card-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 18px;
}

.video-highlights {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 22px;
}

.vh-item {
  font-size: 0.78rem;
  font-weight: 500;
  color: #e2e8f0;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 5px 10px;
  border-radius: var(--radius-sm);
}

.video-action-row {
  margin-top: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid var(--border-subtle);
}

.video-yt-link {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.video-yt-link:hover {
  color: #ff0000;
  text-decoration: underline;
}

/* ==========================================================================
   FLOATING CONTACT BUTTONS (ZALO & PHONE HOTLINE)
   ========================================================================== */

.floating-contact {
  position: fixed;
  bottom: 25px;
  right: 25px;
  z-index: 99999;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.btn-float {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.5rem;
  text-decoration: none;
  position: relative;
  transition: transform var(--transition-smooth);
}

.btn-float-zalo {
  background: linear-gradient(135deg, #0088ff, #0055ff);
  border: 2px solid #00f2fe;
  box-shadow: 0 0 15px rgba(0, 136, 255, 0.6);
  animation: shakeGlowZalo 3s infinite ease-in-out;
}

.btn-float-phone {
  background: linear-gradient(135deg, #10b981, #059669);
  border: 2px solid #34d399;
  box-shadow: 0 0 15px rgba(16, 185, 129, 0.6);
  animation: shakeGlowPhone 3s infinite ease-in-out 1.5s;
}

@keyframes shakeGlowZalo {
  0%, 100% { box-shadow: 0 0 12px rgba(0, 136, 255, 0.5); transform: rotate(0deg) scale(1); }
  10%, 30% { transform: rotate(-10deg) scale(1.1); box-shadow: 0 0 30px rgba(0, 242, 254, 0.9); }
  20%, 40% { transform: rotate(10deg) scale(1.1); box-shadow: 0 0 30px rgba(0, 242, 254, 0.9); }
  50% { transform: rotate(0deg) scale(1.05); }
  60%, 90% { transform: scale(1); box-shadow: 0 0 15px rgba(0, 136, 255, 0.6); }
}

@keyframes shakeGlowPhone {
  0%, 100% { box-shadow: 0 0 12px rgba(16, 185, 129, 0.5); transform: rotate(0deg) scale(1); }
  10%, 30% { transform: rotate(-10deg) scale(1.1); box-shadow: 0 0 30px rgba(52, 211, 153, 0.9); }
  20%, 40% { transform: rotate(10deg) scale(1.1); box-shadow: 0 0 30px rgba(52, 211, 153, 0.9); }
  50% { transform: rotate(0deg) scale(1.05); }
  60%, 90% { transform: scale(1); box-shadow: 0 0 15px rgba(16, 185, 129, 0.6); }
}

.float-tooltip {
  position: absolute;
  right: 72px;
  background: rgba(15, 23, 42, 0.95);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 700;
  padding: 8px 14px;
  border-radius: 10px;
  white-space: nowrap;
  border: 1px solid rgba(255, 255, 255, 0.15);
  pointer-events: none;
  opacity: 0;
  transform: translateX(10px);
  transition: all var(--transition-fast);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(8px);
}

.btn-float:hover .float-tooltip {
  opacity: 1;
  transform: translateX(0);
}

/* ==========================================================================
   DVT AI VOICE & CHATBOT WIDGET (VERCEL CYBERPUNK STYLE)
   ========================================================================== */

.dvt-ai-launcher {
  position: fixed;
  bottom: 25px;
  left: 25px;
  z-index: 99999;
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
}

.dvt-ai-btn {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: linear-gradient(135deg, #7c3aed, #00e5ff);
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.6), 0 0 40px rgba(124, 58, 237, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.6rem;
  transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  animation: dvt-pulse-glow 2.5s infinite;
  position: relative;
}

.dvt-ai-btn:hover {
  transform: scale(1.12) rotate(8deg);
  box-shadow: 0 0 30px rgba(0, 229, 255, 0.9), 0 0 60px rgba(124, 58, 237, 0.7);
}

.dvt-ai-badge {
  background: rgba(15, 23, 42, 0.92);
  color: #00e5ff;
  border: 1px solid rgba(0, 229, 255, 0.4);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  gap: 6px;
  backdrop-filter: blur(8px);
  animation: dvt-badge-fade 3s ease-in-out infinite alternate;
}

@keyframes dvt-badge-fade {
  0% { transform: translateY(0); box-shadow: 0 4px 15px rgba(0, 0, 0, 0.5); }
  100% { transform: translateY(-4px); box-shadow: 0 8px 25px rgba(0, 229, 255, 0.35); }
}

@keyframes dvt-pulse-glow {
  0% { box-shadow: 0 0 0 0 rgba(0, 229, 255, 0.7); transform: scale(1); }
  50% { box-shadow: 0 0 0 16px rgba(0, 229, 255, 0), 0 0 25px rgba(124, 58, 237, 0.6); transform: scale(1.05); }
  100% { box-shadow: 0 0 0 0 rgba(0, 229, 255, 0); transform: scale(1); }
}

/* Popup Chat & Voice Window */
.dvt-ai-window {
  position: fixed;
  bottom: 95px;
  left: 25px;
  width: 380px;
  max-width: calc(100vw - 40px);
  height: 560px;
  background: #0b1120;
  border: 1px solid rgba(0, 229, 255, 0.4);
  border-radius: 20px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.9), 0 0 30px rgba(0, 229, 255, 0.2);
  z-index: 100000;
  display: none;
  flex-direction: column;
  overflow: hidden;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  transform: translateY(20px) scale(0.95);
  opacity: 0;
}

.dvt-ai-window.active {
  display: flex;
  transform: translateY(0) scale(1);
  opacity: 1;
}

/* Header */
.dvt-ai-header {
  background: linear-gradient(135deg, #1e1b4b, #0f172a);
  padding: 14px 18px;
  border-bottom: 1px solid rgba(0, 229, 255, 0.2);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.dvt-ai-header-info {
  display: flex;
  align-items: center;
  gap: 10px;
}

.dvt-ai-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: linear-gradient(135deg, #7c3aed, #00e5ff);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: #fff;
}

.dvt-ai-title {
  font-size: 0.95rem;
  font-weight: 800;
  color: #fff;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 6px;
}

.dvt-ai-tag {
  font-size: 0.68rem;
  background: #7c3aed;
  padding: 2px 6px;
  border-radius: 4px;
  color: #fff;
  font-weight: 700;
}

.dvt-ai-status {
  font-size: 0.72rem;
  color: #38bdf8;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 6px;
}

.dvt-ai-header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.dvt-ai-ext-btn {
  background: rgba(0, 242, 254, 0.15);
  border: 1px solid rgba(0, 242, 254, 0.4);
  color: #00f2fe;
  width: 30px;
  height: 30px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  font-size: 0.75rem;
  transition: all 0.2s;
}

.dvt-ai-ext-btn:hover {
  background: rgba(0, 242, 254, 0.35);
  color: #fff;
}

.dvt-ai-close {
  background: none;
  border: none;
  color: #94a3b8;
  font-size: 1.2rem;
  cursor: pointer;
  padding: 4px;
  transition: color 0.2s;
}

.dvt-ai-close:hover { color: #fff; }

/* Messages Body */
.dvt-ai-messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.dvt-ai-messages::-webkit-scrollbar { width: 4px; }
.dvt-ai-messages::-webkit-scrollbar-thumb { background: #334155; border-radius: 4px; }

.dvt-ai-portal-banner {
  background: linear-gradient(135deg, rgba(124, 58, 237, 0.35), rgba(0, 242, 254, 0.25));
  border: 1px solid rgba(0, 242, 254, 0.4);
  border-radius: 10px;
  padding: 8px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-decoration: none;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
  transition: transform var(--transition-fast);
}

.dvt-ai-portal-banner:hover {
  transform: translateY(-2px);
  border-color: rgba(0, 242, 254, 0.8);
}

.dvt-portal-inner {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #fff;
  font-size: 0.75rem;
}

.dvt-portal-sub {
  font-size: 0.68rem;
  color: #38bdf8;
}

.dvt-msg {
  max-width: 86%;
  padding: 10px 14px;
  border-radius: 14px;
  font-size: 0.88rem;
  line-height: 1.45;
  word-break: break-word;
}

.dvt-msg-bot {
  align-self: flex-start;
  background: #131b2e;
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: #e2e8f0;
  border-bottom-left-radius: 3px;
}

.dvt-msg-user {
  align-self: flex-end;
  background: linear-gradient(135deg, #0284c7, #2563eb);
  color: #fff;
  border-bottom-right-radius: 3px;
  font-weight: 500;
}

/* Suggestions Quick Chips */
.dvt-ai-chips {
  display: flex;
  flex-wrap: nowrap;
  gap: 6px;
  overflow-x: auto;
  padding: 8px 16px;
  background: rgba(13, 20, 37, 0.6);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.dvt-ai-chips::-webkit-scrollbar { display: none; }

.dvt-chip {
  background: #1e293b;
  color: #00e5ff;
  border: 1px solid rgba(0, 229, 255, 0.3);
  padding: 4px 10px;
  border-radius: 12px;
  font-size: 0.75rem;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s;
  text-decoration: none;
}

.dvt-chip:hover {
  background: #00e5ff;
  color: #000;
  font-weight: 700;
}

.chip-portal {
  background: linear-gradient(135deg, rgba(0, 242, 254, 0.25), rgba(124, 58, 237, 0.3));
  border-color: #00e5ff;
  color: #fff;
  font-weight: 700;
}

/* Voice Recording Bar */
.dvt-voice-bar {
  padding: 6px 14px;
  background: rgba(124, 58, 237, 0.2);
  border-top: 1px solid rgba(124, 58, 237, 0.3);
  color: #c084fc;
  font-size: 0.78rem;
  display: none;
  align-items: center;
  gap: 8px;
}

/* Input Footer */
.dvt-ai-footer {
  padding: 10px 14px;
  background: #0f172a;
  border-top: 1px solid rgba(0, 229, 255, 0.2);
  display: flex;
  gap: 8px;
  align-items: center;
}

.dvt-voice-mic-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, #7c3aed, #9333ea);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  cursor: pointer;
  flex-shrink: 0;
  transition: all 0.2s;
}

.dvt-voice-mic-btn:hover {
  transform: scale(1.08);
  box-shadow: 0 0 12px rgba(168, 85, 247, 0.7);
}

.dvt-voice-mic-btn.recording {
  background: #ef4444 !important;
  animation: dvt-mic-pulse 1s infinite;
  border-color: #fca5a5;
}

@keyframes dvt-mic-pulse {
  0% { transform: scale(1); box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.8); }
  50% { transform: scale(1.15); box-shadow: 0 0 0 10px rgba(239, 68, 68, 0); }
  100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(239, 68, 68, 0); }
}

.dvt-ai-input {
  flex: 1;
  background: #1e293b;
  border: 1px solid #334155;
  color: #fff;
  padding: 10px 14px;
  border-radius: 25px;
  font-size: 0.88rem;
  outline: none;
  transition: border-color 0.2s;
  font-family: inherit;
}

.dvt-ai-input:focus {
  border-color: #00e5ff;
  box-shadow: 0 0 8px rgba(0, 229, 255, 0.3);
}

.dvt-ai-send {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: #00e5ff;
  color: #000;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  cursor: pointer;
  transition: all 0.2s;
  flex-shrink: 0;
}

.dvt-ai-send:hover { background: #38bdf8; transform: scale(1.08); }

.dvt-tts-btn {
  background: none;
  border: none;
  color: #00e5ff;
  cursor: pointer;
  padding: 3px 8px;
  font-size: 0.78rem;
  margin-top: 6px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  border-radius: 6px;
  background: rgba(0, 229, 255, 0.08);
  border: 1px solid rgba(0, 229, 255, 0.2);
  transition: all 0.2s;
}

.dvt-tts-btn:hover {
  background: rgba(0, 229, 255, 0.2);
  color: #38bdf8;
}

/* Typing Indicator */
.dvt-typing {
  display: flex;
  gap: 4px;
  padding: 8px 12px;
  background: #131b2e;
  border-radius: 12px;
  align-self: flex-start;
  display: none;
}

.dvt-dot {
  width: 6px;
  height: 6px;
  background: #00e5ff;
  border-radius: 50%;
  animation: dvt-blink 1.4s infinite both;
}

.dvt-dot:nth-child(2) { animation-delay: 0.2s; }
.dvt-dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes dvt-blink {
  0%, 80%, 100% { opacity: 0.2; transform: scale(0.8); }
  40% { opacity: 1; transform: scale(1.2); }
}

/* Mobile Responsive */
@media (max-width: 768px) {
  .floating-contact {
    bottom: 20px;
    right: 15px;
    gap: 10px;
  }
  .btn-float {
    width: 50px;
    height: 50px;
    font-size: 1.3rem;
  }
  .dvt-ai-launcher {
    bottom: 20px;
    left: 15px;
  }
  .dvt-ai-btn {
    width: 52px;
    height: 52px;
    font-size: 1.35rem;
  }
  .dvt-ai-badge {
    display: none; /* Hide badge text on mobile to avoid screen overlap */
  }
  .dvt-ai-window {
    left: 10px;
    right: 10px;
    bottom: 80px;
    width: auto;
    max-width: calc(100vw - 20px);
    height: calc(100vh - 120px);
    max-height: 520px;
  }
}