/* ==========================================================================
   CSS VARIABLES & THEME SETUP (CYBERPUNK NEON SPACE - TIẾNG VIỆT CHUẨN)
   ========================================================================== */
:root {
  --bg-dark: #0a0e17;
  --bg-surface: #0f1626;
  --bg-card: rgba(16, 24, 40, 0.76);
  --bg-card-hover: rgba(22, 35, 60, 0.92);
  
  --cyan-neon: #00f2fe;
  --cyan-glow: rgba(0, 242, 254, 0.38);
  --blue-electric: #4facfe;
  --purple-neon: #a855f7;
  --purple-glow: rgba(168, 85, 247, 0.38);
  --purple-deep: #7928ca;
  --emerald-neon: #10b981;
  --emerald-glow: rgba(16, 185, 129, 0.35);
  --amber-neon: #f59e0b;
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-glow-cyan: rgba(0, 242, 254, 0.45);
  --border-glow-purple: rgba(168, 85, 247, 0.45);
  --border-glow-emerald: rgba(16, 185, 129, 0.45);
  
  --shadow-neon-cyan: 0 10px 40px -10px rgba(0, 242, 254, 0.35), 0 0 20px rgba(0, 242, 254, 0.2);
  --shadow-neon-purple: 0 10px 40px -10px rgba(168, 85, 247, 0.35), 0 0 20px rgba(168, 85, 247, 0.2);
  --shadow-neon-emerald: 0 10px 40px -10px rgba(16, 185, 129, 0.35), 0 0 20px rgba(16, 185, 129, 0.2);
  --shadow-box: 0 18px 45px -12px rgba(0, 0, 0, 0.7);
  
  /* Typography tiếng Việt chuẩn 100% không bị lỗi dấu font */
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace, ui-monospace, Menlo, Consolas;
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-full: 9999px;
  
  --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-smooth: 0.32s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  color-scheme: dark;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-body);
  line-height: 1.65;
  overflow-x: hidden;
  min-height: 100vh;
  position: relative;
}

/* Text Selection */
::selection {
  background: rgba(0, 242, 254, 0.35);
  color: #ffffff;
}

/* Background Cyber Grid & Nebula Atmosphere */
.space-background {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.nebula-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(130px);
  opacity: 0.36;
  animation: pulseGlow 14s ease-in-out infinite alternate;
}

.nebula-1 {
  top: -12%;
  left: 15%;
  width: 580px;
  height: 580px;
  background: radial-gradient(circle, rgba(0, 242, 254, 0.38) 0%, rgba(79, 172, 254, 0.15) 70%, transparent 100%);
}

.nebula-2 {
  top: 42%;
  right: -12%;
  width: 680px;
  height: 680px;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.3) 0%, rgba(121, 40, 202, 0.12) 70%, transparent 100%);
  animation-delay: -5s;
}

.nebula-3 {
  bottom: -15%;
  left: 8%;
  width: 520px;
  height: 520px;
  background: radial-gradient(circle, rgba(0, 242, 254, 0.22) 0%, transparent 70%);
  animation-delay: -9s;
}

@keyframes pulseGlow {
  0% { transform: scale(1) translate(0, 0); opacity: 0.28; }
  50% { transform: scale(1.15) translate(25px, 30px); opacity: 0.44; }
  100% { transform: scale(0.96) translate(-20px, -20px); opacity: 0.3; }
}

.cyber-grid {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(to right, rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 50px 50px;
  mask-image: radial-gradient(circle at 50% 30%, black 25%, transparent 88%);
  -webkit-mask-image: radial-gradient(circle at 50% 30%, black 25%, transparent 88%);
}

#star-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}

/* Container */
.container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 2;
}

/* Header Nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  background: rgba(10, 14, 23, 0.85);
  border-bottom: 1px solid var(--border-subtle);
  transition: border-color var(--transition-fast);
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-main);
}

.logo-badge {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  transition: transform var(--transition-smooth), filter var(--transition-smooth);
}

.logo-badge:hover {
  transform: scale(1.08);
  filter: drop-shadow(0 0 12px rgba(0, 242, 254, 0.7));
}

.logo-svg-img {
  width: 100%;
  height: 100%;
  display: block;
  border-radius: 50%;
}

.brand-name {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(90deg, #ffffff 40%, var(--cyan-neon) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 600;
  color: #34d399;
  letter-spacing: 0.02em;
}

.status-text-mobile {
  display: none;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--emerald-neon);
  box-shadow: 0 0 10px var(--emerald-neon);
  animation: blinkDot 2s infinite ease-in-out;
}

@keyframes blinkDot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.35; transform: scale(0.85); }
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 26px;
  list-style: none;
}

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
}

.nav-link:hover {
  color: var(--cyan-neon);
}

/* Hero Section */
.hero-section {
  padding: 85px 0 65px;
  text-align: center;
  position: relative;
}

.hero-content {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* Cyber Avatar Frame */
.avatar-wrapper {
  position: relative;
  width: 114px;
  height: 114px;
  margin-bottom: 26px;
}

.avatar-halo {
  position: absolute;
  inset: -6px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--cyan-neon), var(--purple-neon));
  opacity: 0.8;
  filter: blur(14px);
  animation: rotateHalo 8s linear infinite;
}

.avatar-circle {
  position: relative;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: #0f172a;
  border: 2.5px solid var(--cyan-neon);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: inset 0 0 20px rgba(0, 242, 254, 0.4), 0 0 32px rgba(0, 242, 254, 0.45);
  overflow: hidden;
}

.avatar-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  display: block;
  transition: transform 0.5s ease;
}

.avatar-wrapper:hover .avatar-img {
  transform: scale(1.08);
}

@keyframes rotateHalo {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.role-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 18px;
  border-radius: var(--radius-full);
  background: rgba(0, 242, 254, 0.08);
  border: 1px solid rgba(0, 242, 254, 0.32);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--cyan-neon);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 22px;
  box-shadow: 0 0 22px rgba(0, 242, 254, 0.16);
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4.5vw, 3.25rem);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.025em;
  margin-bottom: 20px;
  color: #ffffff;
  word-break: break-word;
}

.title-highlight {
  background: linear-gradient(135deg, var(--cyan-neon) 0%, var(--blue-electric) 50%, var(--purple-neon) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 0 35px rgba(0, 242, 254, 0.32);
}

.hero-description {
  font-size: clamp(1.02rem, 2vw, 1.22rem);
  color: var(--text-muted);
  max-width: 740px;
  margin-bottom: 30px;
  font-weight: 400;
  line-height: 1.7;
}

/* Live WAN Mini Bar in Hero */
.wan-quick-pill {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: rgba(15, 23, 42, 0.85);
  border: 1px dashed rgba(0, 242, 254, 0.45);
  padding: 9px 22px;
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 34px;
  backdrop-filter: blur(10px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
  flex-wrap: wrap;
  justify-content: center;
}

.wan-val {
  font-family: var(--font-mono);
  color: var(--cyan-neon);
  font-weight: 700;
  letter-spacing: 0.03em;
}

/* CTA Button Group */
.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 38px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: var(--radius-md);
  font-size: 0.98rem;
  font-weight: 700;
  text-decoration: none;
  transition: all var(--transition-smooth);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, #00f2fe 0%, #4facfe 100%);
  color: #060e1a;
  box-shadow: 0 0 25px rgba(0, 242, 254, 0.42), 0 8px 20px rgba(0, 0, 0, 0.45);
}

.btn-primary:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 0 38px rgba(0, 242, 254, 0.72), 0 12px 28px rgba(0, 0, 0, 0.55);
  filter: brightness(1.08);
  color: #020710;
}

.btn-secondary {
  background: rgba(16, 24, 40, 0.75);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.16);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(22, 35, 60, 0.95);
  border-color: var(--cyan-neon);
  color: var(--cyan-neon);
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 0 28px rgba(0, 242, 254, 0.3);
}

.btn-zalo {
  background: linear-gradient(135deg, #0088ff 0%, #0066cc 100%);
  color: #ffffff;
  box-shadow: 0 0 22px rgba(0, 136, 255, 0.38);
}

.btn-zalo:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 0 34px rgba(0, 136, 255, 0.65);
  filter: brightness(1.1);
}

/* Edge Highlights Bar */
.edge-badges-strip {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 6px;
}

.edge-pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 15px;
  background: rgba(255, 255, 255, 0.035);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
}

.edge-pill svg {
  color: var(--cyan-neon);
  flex-shrink: 0;
}

/* ==========================================================================
   SECTION COMMONS (SPACING 75px - 85px)
   ========================================================================== */
.section-block {
  padding: 80px 0;
  position: relative;
}

.section-header {
  margin-bottom: 40px;
}

.section-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 12px;
}

.eyebrow-cyan { color: var(--cyan-neon); }
.eyebrow-blue { color: #60a5fa; }
.eyebrow-purple { color: var(--purple-neon); }
.eyebrow-emerald { color: var(--emerald-neon); }

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 3.6vw, 2.45rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  color: #ffffff;
  line-height: 1.3;
  margin-bottom: 14px;
  word-break: break-word;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 760px;
  line-height: 1.7;
}

/* ==========================================================================
   HUB CARD BASE (CYBER GLASS WITH GLOW HOVER)
   ========================================================================== */
.hub-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: all var(--transition-smooth);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-box);
}

.hub-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--border-color, var(--cyan-neon)), transparent);
  opacity: 0.35;
  transition: opacity var(--transition-smooth);
}

/* ==========================================================================
   SECTION 1: NETWORK PRO TOOLS (FULL CLICKABLE MASTER CARD)
   ========================================================================== */
.tools-hub-card {
  --border-color: var(--cyan-neon);
  --hover-shadow: var(--shadow-neon-cyan);
  border-color: rgba(0, 242, 254, 0.25);
  padding: 40px;
  background: linear-gradient(170deg, rgba(16, 24, 40, 0.88) 0%, rgba(10, 15, 27, 0.96) 100%);
  cursor: pointer;
}

.tools-hub-card:hover {
  transform: translateY(-6px) scale(1.008);
  background: rgba(20, 32, 56, 0.95);
  border-color: var(--cyan-neon);
  box-shadow: 0 12px 50px -10px rgba(0, 242, 254, 0.42), 0 0 25px rgba(0, 242, 254, 0.25);
}

.tools-hub-card:hover::before {
  opacity: 1;
}

.hub-main-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding-bottom: 30px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  margin-bottom: 32px;
}

.hub-badge-group {
  display: flex;
  align-items: center;
  gap: 16px;
}

.hub-icon-box {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-md);
  background: rgba(0, 242, 254, 0.1);
  border: 1px solid var(--border-glow-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--cyan-neon);
  box-shadow: 0 0 22px rgba(0, 242, 254, 0.22);
  flex-shrink: 0;
}

.hub-icon-box svg {
  width: 32px;
  height: 32px;
}

.hub-title-box h3 {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 4px;
}

.hub-domain-pill {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--cyan-neon);
  background: rgba(0, 242, 254, 0.08);
  padding: 3px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(0, 242, 254, 0.25);
  display: inline-block;
}

.btn-launch-tools {
  background: linear-gradient(135deg, #00f2fe 0%, #4facfe 100%);
  color: #050b14;
  font-weight: 800;
  font-size: 1.02rem;
  padding: 14px 30px;
  border-radius: var(--radius-md);
  box-shadow: 0 0 25px rgba(0, 242, 254, 0.45);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  transition: all var(--transition-smooth);
}

.btn-launch-tools:hover,
.tools-hub-card:hover .btn-launch-tools {
  transform: translateY(-2px) scale(1.03);
  box-shadow: 0 0 45px rgba(0, 242, 254, 0.75);
  filter: brightness(1.1);
  color: #020710;
}

/* 4 Key Feature Cards Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}

.feature-card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: all var(--transition-fast);
  position: relative;
}

.feature-card:hover {
  background: rgba(0, 242, 254, 0.06);
  border-color: rgba(0, 242, 254, 0.45);
  transform: translateY(-2px);
}

.feature-top {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 12px;
}

.feature-icon-circle {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: rgba(0, 242, 254, 0.12);
  border: 1px solid rgba(0, 242, 254, 0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--cyan-neon);
  flex-shrink: 0;
}

.feature-title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  color: #ffffff;
  line-height: 1.35;
}

.feature-desc {
  font-size: 0.94rem;
  color: var(--text-muted);
  margin-bottom: 14px;
  line-height: 1.6;
}

.keyword-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.kw-tag {
  font-size: 0.76rem;
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.05);
  color: #94a3b8;
  border: 1px solid rgba(255, 255, 255, 0.08);
  font-weight: 600;
}

.feature-card:hover .kw-tag {
  color: var(--cyan-neon);
  border-color: rgba(0, 242, 254, 0.25);
}

/* ==========================================================================
   PORTFOLIO & ABOUT SECTION (ducthangnguyen.com)
   ========================================================================== */
.portfolio-hub-card {
  --border-color: #3b82f6;
  --hover-shadow: 0 10px 40px -10px rgba(59, 130, 246, 0.4), 0 0 20px rgba(59, 130, 246, 0.25);
  border-color: rgba(59, 130, 246, 0.3);
  padding: 40px;
  background: linear-gradient(170deg, rgba(14, 25, 48, 0.88) 0%, rgba(10, 15, 27, 0.96) 100%);
  cursor: pointer;
}

.portfolio-hub-card:hover {
  transform: translateY(-6px) scale(1.008);
  background: rgba(18, 32, 60, 0.95);
  border-color: #60a5fa;
  box-shadow: 0 12px 50px -10px rgba(59, 130, 246, 0.45), 0 0 25px rgba(59, 130, 246, 0.3);
}

.portfolio-hub-card:hover::before {
  opacity: 1;
}

.portfolio-icon-box {
  background: rgba(59, 130, 246, 0.12);
  border: 1px solid rgba(59, 130, 246, 0.4);
  color: #60a5fa;
  box-shadow: 0 0 22px rgba(59, 130, 246, 0.25);
}

.portfolio-domain-pill {
  font-family: var(--font-mono);
  color: #60a5fa;
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.35);
  font-size: 0.88rem;
  padding: 3px 12px;
  border-radius: var(--radius-sm);
  display: inline-block;
}

.btn-launch-portfolio {
  background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
  color: #ffffff;
  font-weight: 800;
  font-size: 1.02rem;
  padding: 14px 30px;
  border-radius: var(--radius-md);
  box-shadow: 0 0 25px rgba(59, 130, 246, 0.45);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  transition: all var(--transition-smooth);
}

.btn-launch-portfolio:hover,
.portfolio-hub-card:hover .btn-launch-portfolio {
  transform: translateY(-2px) scale(1.03);
  box-shadow: 0 0 45px rgba(59, 130, 246, 0.75);
  filter: brightness(1.1);
  color: #ffffff;
}

/* ==========================================================================
   SECTION 2: ARCADE PLAYGROUND & LAB (VISUAL RETRO ICONS)
   ========================================================================== */
.lab-hub-card {
  --border-color: var(--purple-neon);
  --hover-shadow: var(--shadow-neon-purple);
  border-color: rgba(168, 85, 247, 0.28);
  padding: 40px;
  background: linear-gradient(170deg, rgba(22, 17, 39, 0.85) 0%, rgba(10, 14, 23, 0.96) 100%);
}

.lab-hub-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-neon-purple);
  border-color: rgba(168, 85, 247, 0.55);
}

.lab-icon-box {
  background: rgba(168, 85, 247, 0.12);
  border: 1px solid var(--border-glow-purple);
  color: var(--purple-neon);
  box-shadow: 0 0 22px rgba(168, 85, 247, 0.22);
}

.lab-domain-pill {
  font-family: var(--font-mono);
  color: var(--purple-neon);
  background: rgba(168, 85, 247, 0.1);
  border: 1px solid rgba(168, 85, 247, 0.32);
  font-size: 0.88rem;
  padding: 3px 12px;
  border-radius: var(--radius-sm);
  display: inline-block;
}

.btn-launch-lab {
  background: linear-gradient(135deg, #a855f7 0%, #7928ca 100%);
  color: #ffffff;
  font-weight: 800;
  font-size: 1.02rem;
  padding: 14px 30px;
  border-radius: var(--radius-md);
  box-shadow: 0 0 25px rgba(168, 85, 247, 0.45);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  transition: all var(--transition-smooth);
}

.btn-launch-lab:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 0 45px rgba(168, 85, 247, 0.75);
  filter: brightness(1.1);
}

.games-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.game-item-card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(168, 85, 247, 0.2);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-smooth);
  text-decoration: none;
  color: inherit;
  position: relative;
  cursor: pointer;
}

.game-item-card:hover {
  background: rgba(168, 85, 247, 0.08);
  border-color: rgba(168, 85, 247, 0.55);
  transform: translateY(-4px) scale(1.015);
  box-shadow: 0 8px 30px rgba(168, 85, 247, 0.25);
}

.game-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 0.74rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 14px;
  width: fit-content;
}

.badge-arcade {
  background: rgba(168, 85, 247, 0.16);
  color: #d8b4fe;
  border: 1px solid rgba(168, 85, 247, 0.35);
}

.badge-shooter {
  background: rgba(0, 242, 254, 0.16);
  color: #67e8f9;
  border: 1px solid rgba(0, 242, 254, 0.35);
}

.badge-realtime {
  background: rgba(16, 185, 129, 0.16);
  color: #6ee7b7;
  border: 1px solid rgba(16, 185, 129, 0.35);
}

.game-title-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.game-retro-icon {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.icon-tetris { color: #f43f5e; filter: drop-shadow(0 0 6px rgba(244, 63, 94, 0.6)); }
.icon-shooter { color: #00f2fe; filter: drop-shadow(0 0 6px rgba(0, 242, 254, 0.6)); }
.icon-rope { color: #10b981; filter: drop-shadow(0 0 6px rgba(16, 185, 129, 0.6)); }

.game-name {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  color: #ffffff;
  line-height: 1.35;
}

.game-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 14px;
}

.game-action-link {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--purple-neon);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: auto;
}

.game-item-card:hover .game-action-link {
  color: #ffffff;
}

/* ==========================================================================
   SECTION 3: LIFESTYLE & FITNESS (THANGNHAYDAY)
   ========================================================================== */
.fitness-hub-card {
  --border-color: var(--emerald-neon);
  --hover-shadow: var(--shadow-neon-emerald);
  border-color: rgba(16, 185, 129, 0.28);
  padding: 40px;
  background: linear-gradient(170deg, rgba(14, 29, 27, 0.8) 0%, rgba(10, 14, 23, 0.96) 100%);
}

.fitness-hub-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-neon-emerald);
  border-color: rgba(16, 185, 129, 0.55);
}

.fitness-icon-box {
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.4);
  color: var(--emerald-neon);
  box-shadow: 0 0 22px rgba(16, 185, 129, 0.22);
}

.fitness-domain-pill {
  font-family: var(--font-mono);
  color: var(--emerald-neon);
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.35);
  font-size: 0.88rem;
  padding: 3px 12px;
  border-radius: var(--radius-sm);
  display: inline-block;
}

.btn-launch-fitness {
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
  color: #ffffff;
  font-weight: 800;
  font-size: 1.02rem;
  padding: 14px 30px;
  border-radius: var(--radius-md);
  box-shadow: 0 0 25px rgba(16, 185, 129, 0.45);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  transition: all var(--transition-smooth);
}

.btn-launch-fitness:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 0 45px rgba(16, 185, 129, 0.75);
  filter: brightness(1.1);
}

.fitness-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}

.fitness-card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(16, 185, 129, 0.18);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: all var(--transition-fast);
}

.fitness-card:hover {
  background: rgba(16, 185, 129, 0.06);
  border-color: rgba(16, 185, 129, 0.45);
  transform: translateY(-2px);
}

/* ==========================================================================
   FOOTER & DISCREET UTILITY
   ========================================================================== */
.site-footer {
  border-top: 1px solid var(--border-subtle);
  background: rgba(6, 9, 15, 0.96);
  padding: 65px 0 35px;
  margin-top: 40px;
  position: relative;
}

.footer-top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  margin-bottom: 35px;
}

.footer-brand {
  max-width: 440px;
}

.footer-title {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 700;
  color: #ffffff;
  line-height: 1.3;
}

.footer-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.65;
}

.social-contact-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}

.social-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: var(--radius-md);
  color: var(--text-main);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 600;
  transition: all var(--transition-fast);
}

.social-link svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.social-link:hover {
  background: rgba(0, 242, 254, 0.1);
  border-color: var(--cyan-neon);
  color: var(--cyan-neon);
  transform: translateY(-2px) scale(1.02);
}

.social-link.zalo:hover {
  border-color: #0088ff;
  color: #0088ff;
  background: rgba(0, 136, 255, 0.12);
}

/* Private / Discreet Utility Link */
.discreet-box {
  background: rgba(255, 255, 255, 0.02);
  border: 1px dashed rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  padding: 14px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 35px;
  flex-wrap: wrap;
}

.discreet-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--text-dim);
}

.discreet-meta svg {
  color: var(--amber-neon);
  flex-shrink: 0;
}

.discreet-link {
  font-family: var(--font-mono);
  font-size: 0.86rem;
  color: var(--text-muted);
  text-decoration: none;
  padding: 5px 14px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  transition: all var(--transition-fast);
}

.discreet-link:hover {
  color: var(--cyan-neon);
  border-color: rgba(0, 242, 254, 0.45);
  background: rgba(0, 242, 254, 0.06);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 0.86rem;
  color: var(--text-dim);
}

.edge-powered {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.network-dot {
  color: #00f2fe;
}

/* ==========================================================================
   RESPONSIVE DESIGN (TABLETS & MOBILE FIRST)
   ========================================================================== */
@media (max-width: 992px) {
  .features-grid,
  .games-grid,
  .fitness-grid {
    grid-template-columns: 1fr;
  }
  .tools-hub-card,
  .portfolio-hub-card,
  .lab-hub-card,
  .fitness-hub-card {
    padding: 28px 20px;
  }
  .hub-main-header {
    flex-direction: column;
    align-items: flex-start;
  }
  .btn-launch-tools,
  .btn-launch-portfolio,
  .btn-launch-lab,
  .btn-launch-fitness {
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 640px) {
  /* Layout & Container */
  .container {
    padding: 0 16px;
  }

  /* Header Compact */
  .site-header {
    height: 56px;
  }
  .nav-wrapper {
    height: 56px;
  }
  .site-header .nav-menu {
    display: none;
  }
  .brand-logo {
    gap: 10px;
  }
  .logo-badge {
    width: 34px;
    height: 34px;
  }
  .brand-name {
    font-size: 1.05rem;
  }
  .nav-status {
    padding: 4px 10px;
    font-size: 0.72rem;
    gap: 6px;
  }
  .status-dot {
    width: 6px;
    height: 6px;
  }
  .status-text-full {
    display: none;
  }
  .status-text-mobile {
    display: inline;
  }

  /* Hero Section Compact & Perfectly Proportioned */
  .hero-section {
    padding: 28px 0 20px;
  }
  .avatar-wrapper {
    width: 78px;
    height: 78px;
    margin-bottom: 14px;
  }
  .avatar-halo {
    filter: blur(8px);
    inset: -4px;
  }
  .avatar-circle {
    border-width: 2px;
  }
  .role-badge {
    font-size: 0.68rem;
    padding: 4px 12px;
    margin-bottom: 12px;
    letter-spacing: 0.04em;
    gap: 6px;
  }
  .role-badge svg {
    width: 12px;
    height: 12px;
  }
  .hero-title {
    font-size: 1.45rem;
    line-height: 1.25;
    margin-bottom: 10px;
    letter-spacing: -0.02em;
  }
  .hero-description {
    font-size: 0.86rem;
    line-height: 1.52;
    margin-bottom: 16px;
    max-width: 96%;
  }

  /* Quick WAN Pill */
  .wan-quick-pill {
    font-size: 0.78rem;
    padding: 6px 14px;
    gap: 8px;
    margin-bottom: 18px;
    width: 100%;
    max-width: 320px;
  }
  .wan-quick-pill svg {
    width: 14px;
    height: 14px;
  }

  /* Hero CTA Buttons */
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
    gap: 9px;
    margin-bottom: 20px;
  }
  .hero-cta-group .btn {
    width: 100%;
    padding: 10px 16px;
    font-size: 0.88rem;
    min-height: 44px;
    border-radius: 10px;
    gap: 8px;
  }
  .hero-cta-group .btn svg {
    width: 16px;
    height: 16px;
  }

  /* Highlights Bar */
  .edge-badges-strip {
    gap: 6px;
    margin-top: 2px;
  }
  .edge-pill {
    font-size: 0.7rem;
    padding: 4px 10px;
    gap: 5px;
  }
  .edge-pill svg {
    width: 11px;
    height: 11px;
  }

  /* Section Spacing */
  .section-block {
    padding: 34px 0;
  }
  .section-header {
    margin-bottom: 18px;
  }
  .section-eyebrow {
    font-size: 0.72rem;
    margin-bottom: 6px;
    gap: 6px;
  }
  .section-eyebrow svg {
    width: 12px;
    height: 12px;
  }
  .section-title {
    font-size: 1.3rem;
    line-height: 1.3;
    margin-bottom: 6px;
  }
  .section-subtitle {
    font-size: 0.84rem;
    line-height: 1.5;
  }

  /* Cards Compact */
  .tools-hub-card,
  .portfolio-hub-card,
  .lab-hub-card,
  .fitness-hub-card {
    padding: 18px 14px;
    border-radius: 16px;
  }
  .hub-main-header {
    padding-bottom: 14px;
    margin-bottom: 14px;
    gap: 12px;
  }
  .hub-badge-group {
    gap: 12px;
  }
  .hub-icon-box {
    width: 42px;
    height: 42px;
    border-radius: 10px;
  }
  .hub-icon-box svg {
    width: 22px;
    height: 22px;
  }
  .hub-title-box h3 {
    font-size: 1.12rem;
  }
  .hub-domain-pill {
    font-size: 0.75rem;
    padding: 2px 8px;
  }
  .btn-launch-tools,
  .btn-launch-portfolio,
  .btn-launch-lab,
  .btn-launch-fitness {
    padding: 10px 18px;
    font-size: 0.88rem;
    border-radius: 10px;
    min-height: 42px;
    width: 100%;
    justify-content: center;
  }

  /* Inner Feature Cards */
  .features-grid,
  .games-grid,
  .fitness-grid {
    gap: 10px;
  }
  .feature-card,
  .game-item-card,
  .fitness-card {
    padding: 14px 12px;
    border-radius: 12px;
  }
  .feature-top {
    gap: 10px;
    margin-bottom: 8px;
  }
  .feature-icon-circle {
    width: 34px;
    height: 34px;
    border-radius: 8px;
  }
  .feature-icon-circle svg {
    width: 17px;
    height: 17px;
  }
  .feature-title,
  .game-name {
    font-size: 0.98rem;
  }
  .feature-desc,
  .game-desc {
    font-size: 0.82rem;
    line-height: 1.48;
    margin-bottom: 8px;
  }
  .keyword-tags {
    gap: 5px;
  }
  .kw-tag {
    font-size: 0.68rem;
    padding: 2px 7px;
  }
  .game-badge {
    font-size: 0.68rem;
    padding: 3px 8px;
    margin-bottom: 8px;
  }
  .game-title-row {
    gap: 8px;
    margin-bottom: 8px;
  }
  .game-retro-icon {
    width: 22px;
    height: 22px;
  }
  .game-retro-icon svg {
    width: 20px;
    height: 20px;
  }
  .game-action-link {
    font-size: 0.8rem;
  }

  /* Footer Compact */
  .site-footer {
    padding: 32px 0 20px;
    margin-top: 25px;
  }
  .footer-top {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    padding-bottom: 18px;
    margin-bottom: 16px;
  }
  .footer-title {
    font-size: 1.08rem;
  }
  .footer-desc {
    font-size: 0.82rem;
    line-height: 1.5;
  }
  .social-contact-list {
    width: 100%;
    flex-direction: column;
    gap: 8px;
  }
  .social-link {
    width: 100%;
    justify-content: center;
    padding: 8px 14px;
    font-size: 0.8rem;
    min-height: 38px;
  }
  .discreet-box {
    flex-direction: column;
    align-items: flex-start;
    padding: 10px 12px;
    gap: 8px;
    margin-bottom: 16px;
    border-radius: 10px;
  }
  .discreet-meta {
    font-size: 0.76rem;
  }
  .discreet-link {
    width: 100%;
    text-align: center;
    font-size: 0.78rem;
    padding: 6px 10px;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
    gap: 6px;
    font-size: 0.74rem;
  }
}