/* ==========================================================================
   SOCIAL.VN - FUTURISTIC AI & TECHNOLOGY LANDING PAGE
   Concept: SOCIAL × AI × TECHNOLOGY × FUTURE
   Dark Luxury Modern Startup Style
   ========================================================================== */

:root {
  --bg-darkest: #02040a;
  --bg-dark: #030712;
  --bg-surface: #060b18;
  --bg-surface-elevated: #0b1328;
  --bg-glass: rgba(8, 15, 30, 0.65);
  --bg-glass-hover: rgba(15, 27, 52, 0.75);
  
  --border-glass: rgba(255, 255, 255, 0.08);
  --border-glass-bright: rgba(56, 189, 248, 0.35);
  --border-glass-glow: rgba(99, 102, 241, 0.35);

  --accent-cyan: #38bdf8;
  --accent-cyan-bright: #00f0ff;
  --accent-blue: #3b82f6;
  --accent-indigo: #6366f1;
  --accent-violet: #8b5cf6;
  --accent-emerald: #10b981;

  --text-white: #ffffff;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --font-display: 'Space Grotesk', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-body: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Space Grotesk', monospace;

  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  color-scheme: dark;
  background-color: var(--bg-darkest);
  font-family: var(--font-body);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

body {
  background-color: var(--bg-darkest);
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-darkest);
}
::-webkit-scrollbar-thumb {
  background: rgba(56, 189, 248, 0.2);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(56, 189, 248, 0.5);
}

/* Subtle Ambient Background Gradients */
.ambient-glow {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}
.ambient-glow::before {
  content: '';
  position: absolute;
  top: -15%;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  height: 600px;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.12) 0%, rgba(99, 102, 241, 0.08) 40%, transparent 70%);
  filter: blur(80px);
}
.ambient-glow::after {
  content: '';
  position: absolute;
  bottom: 10%;
  left: 30%;
  width: 700px;
  height: 500px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.08) 0%, rgba(59, 130, 246, 0.05) 50%, transparent 75%);
  filter: blur(90px);
}

/* Cyber Vignette */
.cyber-vignette {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  background: radial-gradient(circle at center, transparent 40%, rgba(2, 4, 10, 0.7) 90%, rgba(2, 4, 10, 0.95) 100%);
}

/* 3D WebGL Canvas Layer */
#webgl-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: auto;
}
#webgl-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

/* Navigation Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  transition: all 0.4s var(--ease-out-expo);
  padding: 1.25rem 2rem;
}

.site-header.scrolled {
  padding: 0.85rem 2rem;
  background: rgba(3, 7, 18, 0.75);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border-glass);
  box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.7);
}

.header-container {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Brand Logo */
.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--text-white);
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  position: relative;
  transition: opacity 0.25s ease;
}
.brand-logo:hover {
  opacity: 0.92;
}
.brand-logo-text {
  background: linear-gradient(135deg, #ffffff 30%, #e0f2fe 60%, var(--accent-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 0 30px rgba(56, 189, 248, 0.3);
}
.brand-logo-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 12px var(--accent-cyan-bright), 0 0 24px var(--accent-cyan);
  display: inline-block;
  animation: pulse-beacon 2s infinite ease-in-out;
}

/* Header Navigation Links */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}
.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.925rem;
  font-weight: 500;
  transition: all 0.25s ease;
  position: relative;
  padding: 0.3rem 0;
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-indigo));
  transition: width 0.3s var(--ease-out-expo);
  border-radius: 2px;
}
.nav-link:hover {
  color: var(--text-white);
}
.nav-link:hover::after {
  width: 100%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.75rem 1.5rem;
  border-radius: 9999px;
  font-family: var(--font-body);
  font-size: 0.925rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s var(--ease-out-expo);
  position: relative;
  overflow: hidden;
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, #0284c7 0%, #2563eb 50%, #6366f1 100%);
  color: #ffffff;
  box-shadow: 0 0 25px -3px rgba(14, 165, 233, 0.5), inset 0 1px 1px rgba(255, 255, 255, 0.3);
}
.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.25), transparent);
  transition: left 0.6s ease;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 35px 2px rgba(56, 189, 248, 0.7), inset 0 1px 1px rgba(255, 255, 255, 0.4);
}
.btn-primary:hover::before {
  left: 100%;
}

.btn-zalo {
  background: linear-gradient(135deg, #0068ff 0%, #0084ff 100%);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 0 20px -3px rgba(0, 104, 255, 0.4);
}
.btn-zalo:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px 2px rgba(0, 132, 255, 0.6);
  background: linear-gradient(135deg, #0056d6 0%, #0077eb 100%);
}

.btn-glass {
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-glass-bright);
  color: var(--text-white);
}
.btn-glass:hover {
  background: rgba(56, 189, 248, 0.12);
  border-color: var(--accent-cyan);
  box-shadow: 0 0 20px rgba(56, 189, 248, 0.25);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 0.5rem 1.1rem;
  font-size: 0.85rem;
}
.btn-lg {
  padding: 0.95rem 2.2rem;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
}

/* Hero Section */
.hero-section {
  min-height: 100vh;
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 8rem 1.5rem 5rem;
  z-index: 2;
  overflow: hidden;
}

.hero-content {
  max-width: 960px;
  width: 100%;
  margin: 0 auto;
  text-align: center;
  position: relative;
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.6rem;
}

/* Badge Website Updating */
.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.45rem 1.15rem;
  border-radius: 9999px;
  background: rgba(8, 18, 38, 0.7);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(56, 189, 248, 0.3);
  box-shadow: 0 0 20px rgba(56, 189, 248, 0.15), inset 0 0 12px rgba(56, 189, 248, 0.05);
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  /* text-transform: none; */
  color: var(--accent-cyan);
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-cyan-bright);
  box-shadow: 0 0 10px var(--accent-cyan-bright), 0 0 20px var(--accent-cyan);
  animation: pulse-beacon 1.8s infinite ease-in-out;
}

/* Big Hero Logo */
.hero-logo-container {
  position: relative;
  margin-top: 0.5rem;
}
.hero-logo {
  font-family: var(--font-display);
  font-size: clamp(3.8rem, 9vw, 7.5rem);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.04em;
  background: linear-gradient(180deg, #ffffff 0%, #e0f2fe 45%, #7dd3fc 80%, #38bdf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 0 45px rgba(56, 189, 248, 0.45));
  user-select: none;
}

.hero-logo-tagline {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-top: 0.75rem;
  color: var(--accent-cyan);
  font-family: var(--font-display);
  font-size: 0.85rem;
  letter-spacing: 0.35em;
  /* text-transform: none; */
  font-weight: 600;
  opacity: 0.85;
}
.hero-logo-tagline .divider-dot {
  color: var(--accent-indigo);
}

/* Hero Headline */
.hero-headline {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4.2vw, 3.4rem);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -0.03em;
  color: var(--text-white);
  max-width: 820px;
  margin-top: 0.25rem;
}
.hero-headline .highlight {
  background: linear-gradient(135deg, var(--accent-cyan-bright) 0%, var(--accent-blue) 60%, var(--accent-violet) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Hero Description */
.hero-description {
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 680px;
  font-weight: 400;
  line-height: 1.65;
}

/* CTA Buttons Wrapper */
.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 0.75rem;
}

/* Hotline Pill in Hero */
.hero-hotline-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.65rem 1.4rem;
  border-radius: 9999px;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.95rem;
  color: var(--text-secondary);
  transition: all 0.3s ease;
  text-decoration: none;
}
.hero-hotline-pill:hover {
  border-color: var(--accent-cyan);
  color: var(--text-white);
  background: rgba(56, 189, 248, 0.1);
  transform: translateY(-2px);
}
.hero-hotline-pill strong {
  color: var(--accent-cyan);
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.04em;
}

/* Scroll Indicator */
.scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--text-muted);
  transition: color 0.3s ease;
}
.scroll-indicator:hover {
  color: var(--accent-cyan);
}
.scroll-indicator-text {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.25em;
  /* text-transform: none; */
}
.scroll-indicator-mouse {
  width: 22px;
  height: 36px;
  border-radius: 12px;
  border: 2px solid rgba(255, 255, 255, 0.2);
  position: relative;
  display: flex;
  justify-content: center;
  padding-top: 6px;
}
.scroll-indicator-wheel {
  width: 4px;
  height: 8px;
  background: var(--accent-cyan);
  border-radius: 2px;
  animation: scroll-wheel 2s infinite ease-in-out;
}

/* Sections Common Styling */
.section {
  position: relative;
  z-index: 10;
  padding: 6.5rem 1.5rem;
  max-width: 1200px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 3.5rem;
}
.section-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.95rem;
  border-radius: 9999px;
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.2);
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  /* text-transform: none; */
  color: var(--accent-cyan);
  margin-bottom: 1.25rem;
}
.section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 3.6vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-white);
  line-height: 1.2;
  margin-bottom: 1rem;
}
.section-description {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Glassmorphic Cards */
.glass-panel {
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-glass);
  border-radius: 24px;
  padding: 2.5rem;
  box-shadow: 0 10px 40px -10px rgba(0, 0, 0, 0.6);
  position: relative;
  overflow: hidden;
  transition: all 0.35s var(--ease-out-expo);
}
.glass-panel:hover {
  border-color: var(--border-glass-bright);
  box-shadow: 0 15px 50px -10px rgba(56, 189, 248, 0.12);
}
.glass-panel::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(56, 189, 248, 0.5), transparent);
}

/* Section Updating - High-Tech Terminal */
.terminal-card {
  max-width: 860px;
  margin: 0 auto;
  background: rgba(6, 12, 26, 0.85);
  border: 1px solid rgba(56, 189, 248, 0.2);
  box-shadow: 0 0 50px -10px rgba(56, 189, 248, 0.15), 0 20px 40px -15px rgba(0, 0, 0, 0.8);
}
.terminal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 1.25rem;
  margin-bottom: 1.75rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.terminal-dots {
  display: flex;
  gap: 0.5rem;
}
.terminal-dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
}
.dot-red { background: #ef4444; box-shadow: 0 0 8px rgba(239, 68, 68, 0.4); }
.dot-yellow { background: #f59e0b; box-shadow: 0 0 8px rgba(245, 158, 11, 0.4); }
.dot-green { background: #10b981; box-shadow: 0 0 8px rgba(16, 185, 129, 0.4); }

.terminal-title {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.15em;
}

/* Big Cycling Status Text */
.terminal-rotator-box {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 1.5rem 0 2.2rem;
  padding: 1.5rem 1.8rem;
  background: rgba(10, 19, 40, 0.6);
  border-radius: 16px;
  border-left: 4px solid var(--accent-cyan);
}
.terminal-prompt {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  color: var(--accent-cyan);
  user-select: none;
}
.terminal-dynamic-text {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 3.2vw, 2.3rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-white);
  min-height: 2.8rem;
  display: flex;
  align-items: center;
}
.terminal-cursor {
  display: inline-block;
  width: 10px;
  height: 1.8rem;
  background: var(--accent-cyan);
  margin-left: 0.5rem;
  animation: blink 1s step-end infinite;
  box-shadow: 0 0 10px var(--accent-cyan);
}

/* Telemetry Diagnostics Grid */
.telemetry-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}
.telemetry-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.85rem 1.1rem;
  background: rgba(255, 255, 255, 0.02);
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.05);
}
.telemetry-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  /* text-transform: none; */
  letter-spacing: 0.1em;
}
.telemetry-val {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.telemetry-val.active {
  color: var(--accent-cyan);
}

/* Audio/Data Wave Activity Bars */
.wave-visualizer {
  display: flex;
  align-items: flex-end;
  gap: 4px;
  height: 22px;
}
.wave-bar {
  width: 3px;
  background: var(--accent-cyan);
  border-radius: 2px;
  animation: wave-bounce 1.4s infinite ease-in-out alternate;
}
.wave-bar:nth-child(1) { height: 35%; animation-delay: 0.1s; }
.wave-bar:nth-child(2) { height: 70%; animation-delay: 0.3s; }
.wave-bar:nth-child(3) { height: 100%; animation-delay: 0.15s; }
.wave-bar:nth-child(4) { height: 45%; animation-delay: 0.4s; }
.wave-bar:nth-child(5) { height: 85%; animation-delay: 0.25s; }
.wave-bar:nth-child(6) { height: 60%; animation-delay: 0.5s; }
.wave-bar:nth-child(7) { height: 40%; animation-delay: 0.2s; }

/* Section Future - Pillar Cards */
.future-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}
.future-card {
  padding: 2.25rem 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  background: rgba(10, 18, 36, 0.55);
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: 20px;
  transition: all 0.4s var(--ease-out-expo);
  position: relative;
}
.future-card:hover {
  transform: translateY(-6px);
  border-color: rgba(56, 189, 248, 0.4);
  background: rgba(14, 25, 48, 0.7);
  box-shadow: 0 20px 45px -15px rgba(56, 189, 248, 0.2);
}
.future-icon-box {
  width: 54px;
  height: 54px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.15) 0%, rgba(99, 102, 241, 0.15) 100%);
  border: 1px solid rgba(56, 189, 248, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
}
.future-card-title {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-white);
  letter-spacing: -0.02em;
}
.future-card-desc {
  font-size: 0.975rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* Section Contact - Stay Connected */
.contact-container {
  max-width: 920px;
  margin: 0 auto;
}
.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.75rem;
  margin-bottom: 2.5rem;
}
.contact-channel-card {
  padding: 2.25rem 2rem;
  background: rgba(8, 16, 32, 0.75);
  border-radius: 22px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1.25rem;
  transition: all 0.35s var(--ease-out-expo);
  position: relative;
  overflow: hidden;
}
.contact-channel-card:hover {
  transform: translateY(-4px);
  border-color: rgba(56, 189, 248, 0.4);
  box-shadow: 0 15px 40px -10px rgba(56, 189, 248, 0.15);
}
.channel-header {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}
.channel-icon {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
}
.icon-phone-bg {
  background: linear-gradient(135deg, #0284c7 0%, #2563eb 100%);
  box-shadow: 0 0 15px rgba(37, 99, 235, 0.4);
}
.icon-zalo-bg {
  background: linear-gradient(135deg, #0068ff 0%, #0084ff 100%);
  box-shadow: 0 0 15px rgba(0, 104, 255, 0.4);
}
.channel-label {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  /* text-transform: none; */
  color: var(--text-muted);
}
.channel-value {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-white);
  text-decoration: none;
  transition: color 0.2s ease;
}
.channel-value:hover {
  color: var(--accent-cyan);
}
.channel-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
  margin-top: 0.5rem;
}

.copy-btn {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: var(--text-secondary);
  border-radius: 10px;
  padding: 0.55rem 1rem;
  font-size: 0.825rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.25s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}
.copy-btn:hover {
  color: var(--text-white);
  border-color: var(--accent-cyan);
  background: rgba(56, 189, 248, 0.1);
}

/* Big Central Action in Contact */
.contact-central-action {
  text-align: center;
  padding-top: 1rem;
}

/* Footer */
.site-footer {
  position: relative;
  z-index: 10;
  padding: 4rem 1.5rem 3rem;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  background: rgba(2, 4, 10, 0.9);
  backdrop-filter: blur(16px);
}
.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  text-align: center;
}
.footer-logo {
  font-family: var(--font-display);
  font-size: 1.7rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-white);
  text-decoration: none;
}
.footer-status {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.95rem;
  color: var(--text-secondary);
}
.footer-copyright {
  font-size: 0.85rem;
  color: var(--text-muted);
}
.footer-system-beacon {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.85rem;
  border-radius: 9999px;
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid rgba(16, 185, 129, 0.2);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent-emerald);
  letter-spacing: 0.1em;
}

/* Mobile Sticky Call / Chat Bar */
.mobile-sticky-bar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  z-index: 99;
  padding: 0.75rem 1rem;
  background: rgba(3, 7, 18, 0.92);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-top: 1px solid rgba(56, 189, 248, 0.2);
  box-shadow: 0 -10px 30px rgba(0, 0, 0, 0.8);
}
.mobile-sticky-inner {
  display: flex;
  gap: 0.75rem;
  max-width: 500px;
  margin: 0 auto;
}
.mobile-sticky-inner .btn {
  flex: 1;
  padding: 0.75rem 0.5rem;
  font-size: 0.9rem;
}

/* Toast Notification for Copy */
.toast-notice {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 1000;
  background: rgba(6, 13, 28, 0.95);
  border: 1px solid var(--accent-cyan);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.8), 0 0 20px rgba(56, 189, 248, 0.3);
  backdrop-filter: blur(16px);
  padding: 0.85rem 1.4rem;
  border-radius: 12px;
  color: #ffffff;
  font-size: 0.9rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  opacity: 0;
  transform: translateY(15px);
  transition: all 0.3s var(--ease-out-expo);
  pointer-events: none;
}
.toast-notice.show {
  opacity: 1;
  transform: translateY(0);
}

/* Keyframe Animations */
@keyframes pulse-beacon {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.35); opacity: 0.6; }
}

@keyframes blink {
  from, to { opacity: 1; }
  50% { opacity: 0; }
}

@keyframes scroll-wheel {
  0% { transform: translateY(0); opacity: 1; }
  60% { transform: translateY(12px); opacity: 0; }
  100% { transform: translateY(0); opacity: 0; }
}

@keyframes wave-bounce {
  0% { height: 25%; }
  100% { height: 100%; }
}

/* Responsive Breakpoints */
@media (max-width: 1024px) {
  .future-grid {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }
}

@media (max-width: 768px) {
  .site-header {
    padding: 1rem 1.25rem;
  }
  .nav-menu {
    display: none;
  }
  .hero-section {
    padding: 7rem 1.25rem 4rem;
  }
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }
  .mobile-sticky-bar {
    display: block;
  }
  body {
    padding-bottom: 4.5rem; /* space for mobile sticky bar */
  }
  .telemetry-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .toast-notice {
    bottom: 5.5rem;
    right: 1rem;
    left: 1rem;
    justify-content: center;
  }
}

/* Reduced Motion Mode */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}