/* ============================================================================
   DC561 Website - Main Stylesheet
   ============================================================================
   Structure:
   1. CSS Variables & Theme (lines 1-60)
   2. Reset & Base Styles (lines 61-100)
   3. ASCII Background (lines 101-160)
   4. Navigation & Header (lines 161-280)
   5. Hero Section (lines 281-400)
   6. Content Sections & Cards (lines 401-650)
   7. Buttons & Forms (lines 651-750)
   8. Footer (lines 751-850)
   9. Terminal Styles (CTF & Meetup) (lines 851-1200)
   10. Responsive Design (lines 1201-1400)
   ============================================================================ */

/* ============================================================================
   SECTION 1: CSS VARIABLES & THEME
   ============================================================================ */

:root {
  --color-primary: #0ea5e9;
  --color-primary-dark: #0284c7;
  --color-primary-light: #38bdf8;
  --color-accent: #7dd3fc;
  --color-background: #000000;
  --color-surface: rgba(0, 0, 0, 0.8);
  --color-surface-alt: rgba(0, 0, 0, 0.6);
  --color-border: rgba(125, 211, 252, 0.2);
  --color-text: #e5e5e5;
  --color-text-muted: #a3a3a3;
  --color-text-dim: #737373;
  
  --gradient-primary: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  --gradient-dark: linear-gradient(180deg, #0a0a0a 0%, #1a1a1a 100%);
  
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;
  
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
  --shadow-glow: 0 0 40px rgba(14, 165, 233, 0.3);
  
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
  --color-background: #ffffff;
  --color-surface: #f9fafb;
  --color-surface-alt: #f3f4f6;
  --color-border: #e5e7eb;
  --color-text: #111827;
  --color-text-muted: #6b7280;
  --color-text-dim: #9ca3af;
  --gradient-dark: linear-gradient(180deg, #ffffff 0%, #f9fafb 100%);
}

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

html {
  scroll-behavior: smooth;
}

/* Skip Navigation Link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-primary);
  color: white;
  padding: var(--spacing-sm) var(--spacing-md);
  text-decoration: none;
  z-index: 10000;
  border-radius: 0 0 var(--radius-md) 0;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 0;
}

/* ============================================================================
   SECTION 2: RESET & BASE STYLES
   ============================================================================ */

body {
  font-family: var(--font-sans);
  background: #000000;
  color: var(--color-text);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color var(--transition-base), color var(--transition-base);
  position: relative;
}

body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at center, transparent 0%, rgba(0,0,0,0.4) 100%);
  pointer-events: none;
  z-index: 1;
}

/* ASCII Background - Full Prominence */
.ascii-background {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  font-family: 'Courier New', monospace;
  font-size: 10px;
  line-height: 1;
  color: #7dd3fc;
  opacity: 0.4;
  z-index: 0;
  white-space: pre;
  overflow: hidden;
  pointer-events: none;
  letter-spacing: 2px;
  transform: translateZ(0);
  will-change: auto;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  text-shadow: 
    0 0 10px rgba(125, 211, 252, 0.5),
    0 0 20px rgba(14, 165, 233, 0.3);
  mix-blend-mode: screen;
}

/* Mobile optimization */
@media (max-width: 768px) {
  .ascii-background {
    font-size: 6px;
    letter-spacing: 1px;
    line-height: 1.1;
    opacity: 0.3;
    text-shadow: 0 0 5px rgba(125, 211, 252, 0.3);
  }
}

@keyframes glow {
  0%, 100% {
    opacity: 0.4;
    filter: brightness(1) contrast(1);
  }
  50% {
    opacity: 0.5;
    filter: brightness(1.2) contrast(1.1);
  }
}

[data-theme="light"] .ascii-background {
  opacity: 0.25;
  color: #0284c7;
  text-shadow: 
    0 0 5px rgba(14, 165, 233, 0.3),
    0 0 10px rgba(14, 165, 233, 0.2);
  mix-blend-mode: multiply;
}

.noise {
  display: none; /* Disabled to let ASCII background be the main visual element */
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(15px);
  border-bottom: 1px solid rgba(125, 211, 252, 0.2);
  z-index: 1000;
  transition: all var(--transition-base);
  transform: translateY(0);
}

.navbar.navbar-scrolled {
  background: rgba(10, 10, 10, 0.95);
  backdrop-filter: blur(20px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.navbar.navbar-hidden {
  transform: translateY(-100%);
}

/* Fallback for browsers without backdrop-filter support */
@supports not (backdrop-filter: blur(10px)) {
  .navbar {
    background: rgba(10, 10, 10, 0.95);
  }
  
  .navbar.navbar-scrolled {
    background: rgba(10, 10, 10, 0.98);
  }
}

[data-theme="light"] .navbar {
  background: rgba(255, 255, 255, 0.8);
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-lg);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 700;
  font-size: 1.25rem;
}

.logo {
  width: 40px;
  height: 40px;
  color: var(--color-primary);
}

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

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: width var(--transition-base);
}

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

.nav-link:hover::after {
  width: 100%;
}

.theme-toggle {
  background: transparent;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  color: var(--color-text-muted);
}

.theme-toggle:hover {
  background: var(--color-surface);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
}

.sun-icon {
  display: none;
}

[data-theme="light"] .sun-icon {
  display: block;
}

[data-theme="light"] .moon-icon {
  display: none;
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  padding-top: 80px;
  overflow: hidden;
  background: rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(2px);
  z-index: 2;
}

.hero-background {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.grid-pattern {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(rgba(14, 165, 233, 0.1) 1px, transparent 1px),
    linear-gradient(90deg, rgba(14, 165, 233, 0.1) 1px, transparent 1px);
  background-size: 50px 50px;
  animation: grid-move 20s linear infinite;
}

@keyframes grid-move {
  0% { transform: translate(0, 0); }
  100% { transform: translate(50px, 50px); }
}

.gradient-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.5;
  animation: float 20s ease-in-out infinite;
}

.gradient-orb-1 {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--color-primary) 0%, transparent 70%);
  top: -200px;
  left: -200px;
}

.gradient-orb-2 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, var(--color-accent) 0%, transparent 70%);
  bottom: -100px;
  right: -100px;
  animation-delay: -10s;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(30px, -30px) scale(1.1); }
  66% { transform: translate(-20px, 20px) scale(0.9); }
}

.hero-content {
  text-align: center;
  z-index: 2;
}

.glitch-wrapper {
  position: relative;
  display: inline-block;
}

.hero-title {
  font-size: clamp(3rem, 10vw, 6rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  margin-bottom: var(--spacing-md);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  position: relative;
}

.glitch {
  position: relative;
}

.glitch::before,
.glitch::after {
  content: attr(data-text);
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.glitch::before {
  animation: glitch-1 0.3s infinite;
  clip-path: polygon(0 0, 100% 0, 100% 45%, 0 45%);
  transform: translate(-2px, -2px);
  opacity: 0.8;
}

.glitch::after {
  animation: glitch-2 0.3s infinite;
  clip-path: polygon(0 55%, 100% 55%, 100% 100%, 0 100%);
  transform: translate(2px, 2px);
  opacity: 0.8;
}

@keyframes glitch-1 {
  0%, 100% { clip-path: polygon(0 0, 100% 0, 100% 45%, 0 45%); }
  20% { clip-path: polygon(0 15%, 100% 15%, 100% 30%, 0 30%); }
  40% { clip-path: polygon(0 40%, 100% 40%, 100% 60%, 0 60%); }
  60% { clip-path: polygon(0 70%, 100% 70%, 100% 85%, 0 85%); }
  80% { clip-path: polygon(0 0, 100% 0, 100% 45%, 0 45%); }
}

@keyframes glitch-2 {
  0%, 100% { clip-path: polygon(0 55%, 100% 55%, 100% 100%, 0 100%); }
  20% { clip-path: polygon(0 70%, 100% 70%, 100% 85%, 0 85%); }
  40% { clip-path: polygon(0 15%, 100% 15%, 100% 30%, 0 30%); }
  60% { clip-path: polygon(0 40%, 100% 40%, 100% 60%, 0 60%); }
  80% { clip-path: polygon(0 55%, 100% 55%, 100% 100%, 0 100%); }
}

.hero-subtitle {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  color: var(--color-primary);
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.hero-description {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto var(--spacing-2xl);
}

.hero-actions {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-md);
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-fast);
  cursor: pointer;
  border: 2px solid transparent;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  transform: translate(-50%, -50%);
  transition: width var(--transition-slow), height var(--transition-slow);
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl), 0 0 60px rgba(14, 165, 233, 0.4);
}

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn-secondary:hover {
  background: var(--color-surface-alt);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary);
  color: white;
  box-shadow: var(--shadow-glow);
}

.btn-icon {
  width: 20px;
  height: 20px;
}

/* Scroll Indicator */
.scroll-indicator {
  position: absolute;
  bottom: var(--spacing-2xl);
  left: 50%;
  transform: translateX(-50%);
  animation: bounce 2s infinite;
}

.mouse {
  width: 26px;
  height: 40px;
  border: 2px solid var(--color-primary);
  border-radius: 13px;
  position: relative;
}

.wheel {
  width: 4px;
  height: 8px;
  background: var(--color-primary);
  border-radius: 2px;
  position: absolute;
  top: 8px;
  left: 50%;
  transform: translateX(-50%);
  animation: scroll 2s infinite;
}

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

@keyframes scroll {
  0% { opacity: 1; transform: translateX(-50%) translateY(0); }
  100% { opacity: 0; transform: translateX(-50%) translateY(10px); }
}

/* Sections */
.section {
  padding: var(--spacing-3xl) 0;
  position: relative;
  z-index: 2;
}

.section-alt {
  background: rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(5px);
}

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

.section-title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  margin-bottom: var(--spacing-md);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.title-decoration {
  width: 60px;
  height: 4px;
  background: var(--gradient-primary);
  margin: 0 auto;
  border-radius: var(--radius-sm);
}

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
}

.card {
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(125, 211, 252, 0.3);
  border-radius: var(--radius-lg);
  padding: var(--spacing-2xl);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  box-shadow: 
    0 0 30px rgba(14, 165, 233, 0.1),
    inset 0 0 30px rgba(14, 165, 233, 0.05);
}

[data-theme="light"] .card {
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid rgba(14, 165, 233, 0.2);
  box-shadow: 
    0 0 20px rgba(14, 165, 233, 0.08),
    inset 0 0 20px rgba(14, 165, 233, 0.03);
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: var(--color-primary);
}

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

.card-icon {
  width: 48px;
  height: 48px;
  color: var(--color-primary);
  margin-bottom: var(--spacing-lg);
}

.card-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
}

.card-description {
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* Meetup Section */
.meetup-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
}

.meetup-badge {
  display: inline-block;
  background: var(--gradient-primary);
  color: white;
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-lg);
}

.meetup-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: var(--spacing-lg);
}

.meetup-description {
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--spacing-xl);
}

.meetup-details {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

.detail-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  color: var(--color-text-muted);
}

.detail-icon {
  width: 20px;
  height: 20px;
  color: var(--color-primary);
}

/* Terminal */
.terminal {
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}

.terminal-header {
  background: var(--color-surface);
  padding: var(--spacing-sm) var(--spacing-md);
  display: flex;
  gap: var(--spacing-xs);
}

.terminal-button {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-border);
}

.terminal-button:nth-child(1) { background: #ff5f56; }
.terminal-button:nth-child(2) { background: #ffbd2e; }
.terminal-button:nth-child(3) { background: #27c93f; }

.terminal-body {
  padding: var(--spacing-lg);
  font-family: var(--font-mono);
  font-size: 0.875rem;
}

.terminal-line {
  margin-bottom: var(--spacing-sm);
  display: flex;
  align-items: center;
}

.terminal-prompt {
  color: var(--color-primary);
  margin-right: var(--spacing-sm);
}

.terminal-command {
  color: var(--color-text);
}

.terminal-output {
  color: var(--color-text-muted);
  padding-left: var(--spacing-lg);
  opacity: 0;
}

.terminal-output.success {
  color: #4fc844;
}

.terminal-output.info {
  color: #729fcf;
}

.terminal-output.hint {
  color: #f39c12;
  font-style: italic;
}

.terminal-input {
  background: transparent;
  border: none;
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  outline: none;
  flex: 1;
  margin-left: var(--spacing-sm);
  caret-color: var(--color-primary);
}

.terminal-input::placeholder {
  color: var(--color-primary);
  animation: blink 1s infinite;
}

.typing-animation {
  overflow: hidden;
  white-space: nowrap;
  display: inline-block;
}

.terminal-cursor {
  display: inline-block;
  width: 8px;
  height: 16px;
  background: var(--color-primary);
  animation: blink 1s infinite;
}

@keyframes blink {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0; }
}

/* Scroll Animations */
.animate-in {
  animation: fadeInUp 0.6s ease-out forwards;
}

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

.card, .section-title, .meetup-card {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.card.animate-in, .section-title.animate-in, .meetup-card.animate-in {
  opacity: 1;
  transform: translateY(0);
}

/* Contact Cards */
.join-content {
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.join-description {
  font-size: 1.25rem;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-3xl);
}

.contact-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
}

.contact-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-2xl);
  text-decoration: none;
  color: var(--color-text);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.contact-card::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, var(--color-primary) 0%, transparent 70%);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.contact-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: var(--color-primary);
}

.contact-card:hover::before {
  opacity: 0.1;
}

.contact-icon {
  width: 48px;
  height: 48px;
  color: var(--color-primary);
  margin-bottom: var(--spacing-lg);
}

.contact-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
}

.contact-description {
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--spacing-lg);
}

.contact-action {
  color: var(--color-primary);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  transition: transform var(--transition-fast);
}

.contact-card:hover .contact-action {
  transform: translateX(4px);
}

/* Footer */
.footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-2xl) 0;
  margin-top: var(--spacing-3xl);
}

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

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 700;
  font-size: 1.25rem;
}

.footer-logo {
  width: 32px;
  height: 32px;
  color: var(--color-primary);
}

.footer-text {
  color: var(--color-text-muted);
}

/* Responsive Design */
@media (max-width: 768px) {
  .nav-menu {
    gap: var(--spacing-md);
  }
  
  .nav-link {
    font-size: 0.875rem;
  }
  
  .hero-actions {
    flex-direction: column;
    align-items: center;
  }
  
  .btn {
    width: 100%;
    justify-content: center;
  }
  
  .meetup-card {
    grid-template-columns: 1fr;
  }
  
  .contact-cards {
    grid-template-columns: 1fr;
  }
  
  .footer-content {
    flex-direction: column;
    gap: var(--spacing-lg);
    text-align: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-md);
  }
  
  .section {
    padding: var(--spacing-2xl) 0;
  }
  
  .card {
    padding: var(--spacing-lg);
  }
}

/* CTF Console - Debian Terminal Style */
.ctf-console {
  position: fixed;
  bottom: -520px;
  right: 20px;
  width: 680px;
  height: 480px;
  background: #300924;
  border-radius: 8px 8px 0 0;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.8);
  z-index: 9999;
  display: flex;
  flex-direction: column;
  transition: bottom 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  font-family: 'Ubuntu Mono', 'DejaVu Sans Mono', 'Courier New', monospace;
  font-size: 14px;
}

.ctf-console.ctf-active {
  bottom: 20px;
}

.ctf-console.maximized {
  width: calc(100vw - 40px);
  height: calc(100vh - 60px);
  right: 20px;
  left: 20px;
}

.ctf-header {
  background: linear-gradient(to bottom, #504b45 0%, #3c3b37 100%);
  color: #d3d0c8;
  padding: 0;
  display: flex;
  align-items: center;
  font-size: 13px;
  font-family: 'Ubuntu', sans-serif;
  border-radius: 8px 8px 0 0;
  height: 28px;
  position: relative;
}

.ctf-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: rgba(255, 255, 255, 0.1);
}

.terminal-buttons {
  display: flex;
  align-items: center;
  padding: 0 10px;
  gap: 8px;
}

.terminal-button {
  width: 13px;
  height: 13px;
  border-radius: 50%;
  border: 1px solid rgba(0, 0, 0, 0.2);
  cursor: pointer;
  transition: opacity 0.2s;
}

.terminal-button:hover {
  opacity: 0.8;
}

.terminal-button.close {
  background: linear-gradient(to bottom, #ff5f57, #ff3b30);
}

.terminal-button.minimize {
  background: linear-gradient(to bottom, #ffbd2e, #ff9500);
}

.terminal-button.maximize {
  background: linear-gradient(to bottom, #28ca42, #00c826);
}

.terminal-title {
  flex: 1;
  text-align: center;
  padding-right: 60px;
  font-weight: 500;
}

.ctf-close {
  display: none;
}

.ctf-body {
  flex: 1;
  padding: 8px;
  overflow-y: auto;
  background: #300924;
  color: #d3d0c8;
  font-size: 14px;
  line-height: 1.4;
  scrollbar-width: thin;
  scrollbar-color: #5a5252 #300924;
}

.ctf-body::-webkit-scrollbar {
  width: 10px;
}

.ctf-body::-webkit-scrollbar-track {
  background: #300924;
}

.ctf-body::-webkit-scrollbar-thumb {
  background: #5a5252;
  border-radius: 5px;
}

.ctf-body::-webkit-scrollbar-thumb:hover {
  background: #6a5959;
}

.ctf-line {
  margin: 0;
  padding: 2px 0;
  white-space: pre-wrap;
  word-break: break-all;
}

.ctf-line.user-input {
  color: #87d75f;
}

.ctf-line.error {
  color: #ff6b6b;
}

.ctf-line.success {
  color: #4fc844;
  font-weight: normal;
}

.ctf-line.hint {
  color: #f39c12;
}

.ctf-line.system {
  color: #729fcf;
}

.ctf-input-wrapper {
  display: flex;
  align-items: center;
  padding: 8px;
  background: #300924;
  border-top: 1px solid #4a4444;
  min-height: 30px;
}

.ctf-prompt {
  color: #87d75f;
  margin-right: 8px;
  font-weight: normal;
  white-space: nowrap;
}

.ctf-input {
  flex: 1;
  background: transparent;
  border: none;
  color: #d3d0c8;
  font-family: 'Ubuntu Mono', 'DejaVu Sans Mono', 'Courier New', monospace;
  font-size: 14px;
  outline: none;
  caret-color: #d3d0c8;
}

.ctf-input::placeholder {
  color: #666;
}

/* Glitchy text for hints */
.glitch-text {
  position: relative;
  color: var(--color-primary);
  animation: glitch-skew 1s infinite linear alternate-reverse;
}

@keyframes glitch-skew {
  0% {
    text-shadow: 0.05em 0 0 #00fffc, -0.03em -0.04em 0 #fc00ff,
      0.025em 0.04em 0 #fffc00;
  }
  15% {
    text-shadow: 0.05em 0 0 #00fffc, -0.03em -0.04em 0 #fc00ff,
      0.025em 0.04em 0 #fffc00;
  }
  16% {
    text-shadow: -0.05em -0.025em 0 #00fffc, 0.025em 0.035em 0 #fc00ff,
      -0.05em -0.05em 0 #fffc00;
  }
  49% {
    text-shadow: -0.05em -0.025em 0 #00fffc, 0.025em 0.035em 0 #fc00ff,
      -0.05em -0.05em 0 #fffc00;
  }
  50% {
    text-shadow: 0.05em 0.035em 0 #00fffc, 0.03em 0 0 #fc00ff,
      0 -0.04em 0 #fffc00;
  }
  99% {
    text-shadow: 0.05em 0.035em 0 #00fffc, 0.03em 0 0 #fc00ff,
      0 -0.04em 0 #fffc00;
  }
  100% {
    text-shadow: -0.05em 0 0 #00fffc, -0.025em -0.04em 0 #fc00ff,
      -0.04em -0.025em 0 #fffc00;
  }
}

/* Hidden elements that appear during CTF */
.hidden-hint {
  position: fixed;
  bottom: 10px;
  left: 10px;
  color: #111;
  font-size: 10px;
  font-family: var(--font-mono);
  opacity: 0;
  transition: opacity 0.3s;
}

.hidden-hint.revealed {
  opacity: 0.1;
}

.hidden-hint:hover {
  opacity: 1 !important;
  color: var(--color-primary);
}

/* Mobile Navigation */
.mobile-menu-toggle {
  display: none;
  background: transparent;
  border: none;
  color: var(--color-text);
  padding: var(--spacing-sm);
  cursor: pointer;
  z-index: 1001;
}

.mobile-menu-toggle svg {
  width: 24px;
  height: 24px;
}

.mobile-menu-toggle .close-icon {
  display: none;
}

.mobile-menu-toggle.menu-open .menu-icon {
  display: none;
}

.mobile-menu-toggle.menu-open .close-icon {
  display: block;
}

@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: block;
  }
  
  .nav-menu {
    position: fixed;
    top: 60px;
    right: -100%;
    width: 250px;
    height: calc(100vh - 60px);
    background: var(--color-surface);
    border-left: 1px solid var(--color-border);
    flex-direction: column;
    align-items: flex-start;
    padding: var(--spacing-xl);
    gap: var(--spacing-lg);
    transition: right 0.3s ease;
    z-index: 1000;
  }
  
  .nav-menu.nav-menu-open {
    right: 0;
  }
  
  .nav-link {
    width: 100%;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    transition: background 0.2s;
  }
  
  .nav-link:hover {
    background: var(--color-surface-alt);
  }
  
  .theme-toggle {
    width: 100%;
    justify-content: center;
  }
  
  .ctf-console {
    width: calc(100% - 20px);
    right: 10px;
    left: 10px;
  }
}

/* Enhanced Responsive Design */
@media (min-width: 1400px) {
  .container {
    max-width: 1400px;
  }
  
  .hero-title {
    font-size: 4.5rem;
  }
  
  .card {
    padding: var(--spacing-3xl);
  }
}

@media (min-width: 1920px) {
  .container {
    max-width: 1600px;
  }
  
  .hero-content {
    max-width: 1200px;
  }
  
  .hero-title {
    font-size: 5rem;
  }
  
  .hero-subtitle {
    font-size: 2rem;
  }
}

/* Ultra-wide displays */
@media (min-width: 2560px) {
  .container {
    max-width: 2000px;
  }
  
  .hero-content {
    max-width: 1400px;
  }
  
  .card-grid {
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  }
}