/* ==========================================================================
   AIFlo4U Website - Modern Dark Theme with Futuristic Aesthetics
   ========================================================================== */

/* CSS Variables for Consistent Theming */
:root {
  /* Dark Theme Colors */
  --color-dark-primary: #0F0F1A;
  --color-dark-secondary: #1C1E2D;
  --color-dark-tertiary: #1A1A1A;
  --color-dark-accent: #252739;
  
  /* Accent Colors from Logo */
  --color-blue-primary: #00BFFF;
  --color-blue-secondary: #007BFF;
  --color-purple-primary: #8A2BE2;
  --color-purple-secondary: #4B0082;
  --color-teal: #00CED1;
  --color-cyan: #00E5FF;
  
  /* Text Colors */
  --color-text-primary: #F0F0F0;
  --color-text-secondary: #C0C0C0;
  --color-text-muted: #888899;
  --color-text-light: #FFFFFF;
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, var(--color-blue-primary), var(--color-purple-primary));
  --gradient-secondary: linear-gradient(135deg, var(--color-purple-primary), var(--color-teal));
  --gradient-hero: linear-gradient(135deg, var(--color-blue-secondary), var(--color-purple-secondary));
  --gradient-background: radial-gradient(circle at 50% 0%, rgba(0, 123, 255, 0.1), transparent 50%);
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-black: 900;
  
  /* Spacing Scale */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-xxl: 4rem;
  
  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  
  /* Shadows & Glows */
  --shadow-glow-primary: 0 0 20px rgba(0, 191, 255, 0.3);
  --shadow-glow-secondary: 0 0 30px rgba(138, 43, 226, 0.4);
  --shadow-glow-teal: 0 0 25px rgba(0, 206, 209, 0.3);
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.3);
  --shadow-float: 0 12px 40px rgba(0, 0, 0, 0.4);
  
  /* Transitions */
  --transition-fast: 0.2s ease-out;
  --transition-normal: 0.3s ease-in-out;
  --transition-slow: 0.5s ease-in-out;
}

/* ==========================================================================
   Reset and Base Styles
   ========================================================================== */

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-family);
  background-color: var(--color-dark-primary);
  color: var(--color-text-secondary);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

/* Background Effects */
.background-particles {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--gradient-background);
  z-index: -2;
  opacity: 0.3;
}

.background-grid {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(rgba(0, 191, 255, 0.1) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 191, 255, 0.1) 1px, transparent 1px);
  background-size: 100px 100px;
  z-index: -1;
  opacity: 0.1;
  animation: gridFloat 20s ease-in-out infinite;
}

@keyframes gridFloat {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(-10px, -10px); }
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
}

/* ==========================================================================
   Typography
   ========================================================================== */

h1, h2, h3, h4, h5, h6 {
  color: var(--color-text-primary);
  font-weight: var(--font-weight-bold);
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
}

h1 {
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  font-weight: var(--font-weight-black);
  letter-spacing: -1.5px;
}

h2 {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  text-shadow: var(--shadow-glow-primary);
}

h3 {
  font-size: clamp(1.2rem, 3vw, 1.5rem);
  font-weight: var(--font-weight-medium);
}

p {
  margin-bottom: var(--spacing-sm);
  line-height: 1.6;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */

.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: rgba(15, 15, 26, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0, 191, 255, 0.2);
  z-index: 1000;
  transition: var(--transition-normal);
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) 0;
}

.nav-logo .logo-img {
  height: 40px;
  width: auto;
  filter: drop-shadow(var(--shadow-glow-primary));
  transition: var(--transition-normal);
  display: block !important;
  visibility: visible !important;
  opacity: 1 !important;
  position: relative !important;
  z-index: 1001 !important;
}

.nav-logo .logo-img:hover {
  filter: drop-shadow(var(--shadow-glow-secondary));
  transform: scale(1.05);
}

.nav-list {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
}

.nav-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  transition: var(--transition-normal);
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-blue-primary);
  text-shadow: var(--shadow-glow-primary);
  background: rgba(0, 191, 255, 0.1);
}

.nav-toggle {
  display: none;
  color: var(--color-text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  transition: var(--transition-normal);
}

.nav-toggle:hover {
  color: var(--color-blue-primary);
  text-shadow: var(--shadow-glow-primary);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  background: linear-gradient(135deg, var(--color-dark-primary) 0%, var(--color-dark-secondary) 100%);
  overflow: hidden;
}

.hero-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  align-items: center;
  padding: var(--spacing-xxl) 0;
}

.hero-content {
  z-index: 2;
}

.hero-logo {
  margin-bottom: var(--spacing-lg);
}

.featured-logo {
  max-width: 300px;
  height: auto;
  filter: drop-shadow(var(--shadow-glow-secondary));
  animation: logoGlow 3s ease-in-out infinite alternate;
  display: block !important;
  visibility: visible !important;
  opacity: 1 !important;
  position: relative !important;
  z-index: 100 !important;
}

@keyframes logoGlow {
  0% { filter: drop-shadow(var(--shadow-glow-secondary)); }
  100% { filter: drop-shadow(var(--shadow-glow-teal)); }
}

.hero-title {
  margin-bottom: var(--spacing-lg);
  line-height: 1.1;
}

.title-line-1 {
  display: block;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: none;
}

.title-line-2,
.title-line-3 {
  display: block;
  color: var(--color-text-primary);
}

.hero-description {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
  max-width: 500px;
  line-height: 1.7;
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-md) var(--spacing-lg);
  border: none;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-weight: var(--font-weight-semibold);
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--gradient-primary);
  color: var(--color-text-light);
  box-shadow: var(--shadow-glow-primary);
}

.btn-primary:hover {
  transform: translateY(-2px) scale(1.05);
  box-shadow: var(--shadow-glow-secondary);
}

.btn-secondary {
  background: rgba(138, 43, 226, 0.2);
  color: var(--color-purple-primary);
  border: 1px solid var(--color-purple-primary);
}

.btn-secondary:hover {
  background: rgba(138, 43, 226, 0.3);
  box-shadow: var(--shadow-glow-secondary);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: var(--color-blue-primary);
  border: 1px solid var(--color-blue-primary);
}

.btn-outline:hover {
  background: rgba(0, 191, 255, 0.1);
  box-shadow: var(--shadow-glow-primary);
  transform: translateY(-2px);
}

/* Hero Visual */
.hero-visual {
  position: relative;
  height: 500px;
}

.hero-bg-image {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: url('../images/hero-bg.jpg');
  background-size: cover;
  background-position: center;
  border-radius: var(--radius-lg);
  opacity: 0.7;
}

.floating-elements {
  position: relative;
  height: 100%;
}

.floating-card {
  position: absolute;
  background: rgba(28, 30, 45, 0.8);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(0, 191, 255, 0.3);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  color: var(--color-text-primary);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  box-shadow: var(--shadow-card);
  animation: float 6s ease-in-out infinite;
}

.floating-card i {
  font-size: 1.5rem;
  color: var(--color-blue-primary);
}

.card-1 {
  top: 10%;
  right: 10%;
  animation-delay: 0s;
}

.card-2 {
  top: 50%;
  left: 5%;
  animation-delay: 2s;
}

.card-3 {
  bottom: 15%;
  right: 20%;
  animation-delay: 4s;
}

@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-20px); }
}

/* ==========================================================================
   YouTube Section
   ========================================================================== */

.youtube-section {
  padding: var(--spacing-xxl) 0;
  background: var(--color-dark-secondary);
}

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

.section-title {
  margin-bottom: var(--spacing-sm);
}

.section-description {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto;
}

.youtube-container {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--spacing-xl);
  align-items: start;
}

.youtube-placeholder {
  position: relative;
  background: var(--color-dark-primary);
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 16/9;
  cursor: pointer;
  transition: var(--transition-normal);
  border: 1px solid rgba(0, 191, 255, 0.2);
}

.youtube-placeholder:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-float);
  border-color: var(--color-blue-primary);
}

.placeholder-content {
  position: relative;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background: linear-gradient(135deg, rgba(0, 0, 0, 0.8), rgba(28, 30, 45, 0.9)),
              url('../images/tech-interface.jpg');
  background-size: cover;
  background-position: center;
  padding: var(--spacing-lg);
  text-align: center;
}

.play-button {
  width: 80px;
  height: 80px;
  background: var(--gradient-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-md);
  font-size: 2rem;
  color: white;
  box-shadow: var(--shadow-glow-primary);
  transition: var(--transition-normal);
}

.youtube-placeholder:hover .play-button {
  transform: scale(1.1);
  box-shadow: var(--shadow-glow-secondary);
}

.placeholder-info h3 {
  margin-bottom: var(--spacing-xs);
}

.playlist-meta {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.youtube-features {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.feature-item {
  background: rgba(28, 30, 45, 0.6);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(0, 191, 255, 0.2);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  transition: var(--transition-normal);
}

.feature-item:hover {
  border-color: var(--color-blue-primary);
  box-shadow: var(--shadow-glow-primary);
  transform: translateX(5px);
}

.feature-item i {
  font-size: 2rem;
  color: var(--color-blue-primary);
  margin-bottom: var(--spacing-sm);
}

.feature-item h4 {
  margin-bottom: var(--spacing-xs);
  color: var(--color-text-primary);
}

/* ==========================================================================
   News Section
   ========================================================================== */

.news-section {
  padding: var(--spacing-xxl) 0;
  background: var(--color-dark-primary);
}

.news-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.news-card {
  background: rgba(28, 30, 45, 0.6);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(0, 191, 255, 0.2);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition-normal);
  cursor: pointer;
}

.news-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-float);
  border-color: var(--color-blue-primary);
}

.news-card.featured {
  grid-column: span 2;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
}

.card-image {
  position: relative;
  height: 200px;
  overflow: hidden;
}

.featured .card-image {
  height: 100%;
}

.card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition-slow);
}

.news-card:hover .card-image img {
  transform: scale(1.1);
}

.card-category {
  position: absolute;
  top: var(--spacing-sm);
  left: var(--spacing-sm);
  background: var(--gradient-primary);
  color: white;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: var(--font-weight-semibold);
}

.card-content {
  padding: var(--spacing-lg);
}

.card-title {
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
  transition: var(--transition-normal);
}

.news-card:hover .card-title {
  color: var(--color-blue-primary);
}

.card-excerpt {
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-md);
  line-height: 1.6;
}

.card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.news-footer {
  text-align: center;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.footer {
  background: var(--color-dark-secondary);
  border-top: 1px solid rgba(0, 191, 255, 0.2);
  padding: var(--spacing-xl) 0 var(--spacing-lg);
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-lg);
}

.footer-logo-img {
  height: 35px;
  width: auto;
  margin-bottom: var(--spacing-sm);
}

.footer-tagline {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.social-title {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-primary);
  font-size: 1.1rem;
}

.social-links {
  display: flex;
  gap: var(--spacing-md);
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 45px;
  height: 45px;
  background: rgba(0, 191, 255, 0.1);
  border: 1px solid rgba(0, 191, 255, 0.3);
  border-radius: 50%;
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 1.2rem;
  transition: var(--transition-normal);
}

.social-link:hover {
  transform: translateY(-3px) scale(1.1);
  box-shadow: var(--shadow-glow-primary);
}

.social-link.youtube:hover {
  background: rgba(255, 0, 0, 0.2);
  border-color: #ff0000;
  color: #ff0000;
}

.social-link.tiktok:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: #ffffff;
  color: #ffffff;
}

.social-link.twitter:hover {
  background: rgba(29, 161, 242, 0.2);
  border-color: #1da1f2;
  color: #1da1f2;
}

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-lg);
  border-top: 1px solid rgba(0, 191, 255, 0.1);
}

.copyright {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

/* ==========================================================================
   Scroll to Top Button
   ========================================================================== */

.scroll-top {
  position: fixed;
  bottom: var(--spacing-lg);
  right: var(--spacing-lg);
  width: 50px;
  height: 50px;
  background: var(--gradient-primary);
  border: none;
  border-radius: 50%;
  color: white;
  font-size: 1.2rem;
  cursor: pointer;
  opacity: 0;
  transform: translateY(100px);
  transition: var(--transition-normal);
  z-index: 1000;
  box-shadow: var(--shadow-glow-primary);
}

.scroll-top.show {
  opacity: 1;
  transform: translateY(0);
}

.scroll-top:hover {
  transform: translateY(-5px) scale(1.1);
  box-shadow: var(--shadow-glow-secondary);
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */

/* Tablet Styles */
@media screen and (max-width: 768px) {
  .container {
    padding: 0 var(--spacing-md);
  }
  
  .nav-menu {
    position: fixed;
    top: 70px;
    left: -100%;
    width: 100%;
    background: rgba(15, 15, 26, 0.98);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 191, 255, 0.2);
    transition: var(--transition-normal);
    z-index: 999;
  }
  
  .nav-menu.show {
    left: 0;
  }
  
  .nav-list {
    flex-direction: column;
    padding: var(--spacing-lg);
    gap: var(--spacing-md);
  }
  
  .nav-toggle {
    display: block;
  }
  
  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--spacing-lg);
  }
  
  .hero-visual {
    order: -1;
    height: 300px;
  }
  
  .youtube-container {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .news-card.featured {
    grid-column: span 1;
    grid-template-columns: 1fr;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--spacing-lg);
  }
  
  .hero-buttons {
    justify-content: center;
  }
}

/* Mobile Styles */
@media screen and (max-width: 480px) {
  :root {
    --spacing-xxl: 2rem;
    --spacing-xl: 1.5rem;
  }
  
  .hero {
    min-height: 90vh;
  }
  
  .featured-logo {
    max-width: 250px;
  }
  
  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .btn {
    width: 100%;
    max-width: 250px;
    justify-content: center;
  }
  
  .floating-card {
    padding: var(--spacing-sm);
    font-size: 0.9rem;
  }
  
  .floating-card i {
    font-size: 1.2rem;
  }
  
  .news-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  .youtube-features {
    gap: var(--spacing-md);
  }
  
  .feature-item {
    padding: var(--spacing-md);
  }
}

/* Reduced Motion */
@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;
  }
  
  .background-grid {
    animation: none;
  }
  
  .floating-card {
    animation: none;
  }
  
  .featured-logo {
    animation: none;
  }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
  :root {
    --color-text-secondary: #FFFFFF;
    --color-text-muted: #CCCCCC;
  }
  
  .nav-link,
  .social-link,
  .btn-outline {
    border-width: 2px;
  }
}

/* ==========================================================================
   Loading States & Animations
   ========================================================================== */

.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Glassmorphism effect for cards */
.glass-card {
  background: rgba(28, 30, 45, 0.6);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(0, 191, 255, 0.2);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

/* Pulse animation for interactive elements */
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(0, 191, 255, 0.7); }
  70% { box-shadow: 0 0 0 10px rgba(0, 191, 255, 0); }
  100% { box-shadow: 0 0 0 0 rgba(0, 191, 255, 0); }
}

.pulse {
  animation: pulse 2s infinite;
}

/* ==========================================================================
   Utility Classes
   ========================================================================== */

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

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

.hidden { display: none; }
.visible { visibility: visible; }
.invisible { visibility: hidden; }