/* Modern Responsive Landing Page Styles
   Enhanced UI with smooth animations and premium design
*/

/* Variables */
:root{
  --bg: #0a0e1a;
  --bg-secondary: #0f1724;
  --muted: #8b92a8;
  --card: #141b2e;
  --accent-color: #4facfe;
  --accent-secondary: #00f2fe;
  --accent-tertiary: #43e97b;
  --white: #ffffff;
  --max-width: 1200px;
  --gap: 1.5rem;
  --radius: 16px;
  --transition: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --glass: rgba(255,255,255,0.05);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.1);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.2);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.3);
  --shadow-xl: 0 16px 48px rgba(0,0,0,0.4);
}

/* Reset and base */
*{
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html{
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

html, body{
  height: 100%;
  overflow-x: hidden;
}

body{
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: linear-gradient(135deg, #0a0e1a 0%, #0f1724 50%, #0a1628 100%);
  background-attachment: fixed;
  color: var(--white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.6;
  font-size: 16px;
  position: relative;
}

body::before{
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: 
    radial-gradient(circle at 20% 80%, rgba(79, 172, 254, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(67, 233, 123, 0.08) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}

/* Utility container */
.container{
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.5rem;
  position: relative;
  z-index: 1;
}

/* Typography */
h1, h2, h3{
  line-height: 1.2;
  font-weight: 700;
  letter-spacing: -0.02em;
}

h2{
  font-size: clamp(1.875rem, 4vw, 2.5rem);
  margin: 0 0 1rem 0;
}

/* Header / Nav */
.header{
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background: transparent;
  transition: all var(--transition);
  padding: 1rem 0;
  backdrop-filter: blur(0px);
}

.header.scrolled{
  background: rgba(10, 14, 26, 0.9);
  backdrop-filter: blur(20px) saturate(180%);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
  padding: 0.75rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.header-inner{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--gap);
}

/* Brand */
.brand{
  color: var(--white);
  text-decoration: none;
  font-weight: 800;
  font-size: 1.25rem;
  transition: transform var(--transition);
  display: inline-block;
}

.brand:hover{
  transform: translateY(-2px);
}

.brand-accent{
  color: var(--accent-color);
  margin-left: 2px;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse{
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

/* Nav */
.nav{
  display: flex;
  align-items: center;
}

.nav-list{
  display: flex;
  gap: 0.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link{
  color: var(--white);
  text-decoration: none;
  padding: 0.625rem 1rem;
  border-radius: 10px;
  transition: all var(--transition);
  font-weight: 500;
  position: relative;
  overflow: hidden;
}

.nav-link::before{
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-color), var(--accent-secondary));
  transform: translateX(-50%);
  transition: width var(--transition);
}

.nav-link:hover,
.nav-link:focus{
  background: var(--glass);
  outline: none;
  color: var(--accent-color);
}

.nav-link:hover::before{
  width: 80%;
}

.nav-link.active{
  background: linear-gradient(135deg, rgba(79, 172, 254, 0.2), rgba(0, 242, 254, 0.1));
  color: var(--accent-color);
  box-shadow: 0 0 20px rgba(79, 172, 254, 0.3);
}

/* Hamburger (mobile) */
.nav-toggle{
  display: none;
  background: transparent;
  border: 0;
  padding: 0.5rem;
  cursor: pointer;
  z-index: 101;
  transition: transform var(--transition);
}

.nav-toggle:hover{
  transform: scale(1.1);
}

.hamburger,
.hamburger::before,
.hamburger::after{
  display: block;
  width: 24px;
  height: 2.5px;
  background: var(--white);
  border-radius: 3px;
  transition: all var(--transition);
  position: relative;
}

.hamburger::before,
.hamburger::after{
  content: "";
  position: absolute;
  left: 0;
}

.hamburger::before{ top: -8px; }
.hamburger::after{ top: 8px; }

.nav-toggle[aria-expanded="true"] .hamburger{
  background: transparent;
}

.nav-toggle[aria-expanded="true"] .hamburger::before{
  transform: rotate(45deg);
  top: 0;
}

.nav-toggle[aria-expanded="true"] .hamburger::after{
  transform: rotate(-45deg);
  top: 0;
}

/* Hero */
.hero{
  padding-top: 120px;
  padding-bottom: 5rem;
  min-height: 90vh;
  display: flex;
  align-items: center;
  position: relative;
}

.hero-grid{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.hero-content h1{
  margin: 0 0 1rem 0;
  font-size: clamp(2.5rem, 6vw, 4rem);
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, #ffffff 0%, #a8b8d8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: fadeInUp 0.8s ease-out;
}

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

.lead{
  color: var(--muted);
  margin: 0 0 2rem 0;
  font-size: clamp(1rem, 2vw, 1.125rem);
  line-height: 1.7;
  max-width: 540px;
  animation: fadeInUp 0.8s ease-out 0.2s backwards;
}

.hero-cta{
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease-out 0.4s backwards;
}

/* Hero visual */
.hero-visual{
  animation: fadeInUp 0.8s ease-out 0.6s backwards;
}

.card-visual{
  width: 100%;
  max-width: 500px;
  height: 400px;
  border-radius: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(79, 172, 254, 0.1), rgba(67, 233, 123, 0.05));
  backdrop-filter: blur(10px);
  box-shadow: 
    0 8px 32px rgba(0, 0, 0, 0.3),
    inset 0 1px 0 rgba(255, 255, 255, 0.1);
  overflow: hidden;
  position: relative;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.svg-blob{
  width: 80%;
  height: 80%;
  animation: float 6s ease-in-out infinite;
  filter: drop-shadow(0 0 40px rgba(79, 172, 254, 0.4));
}

@keyframes float{
  0%, 100% { transform: translateY(0px) rotate(0deg); }
  50% { transform: translateY(-20px) rotate(5deg); }
}

/* Floating orbs */
.floating-orbs{
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
}

.orb{
  position: absolute;
  border-radius: 50%;
  filter: blur(40px);
  opacity: 0.6;
  animation: float-orb 8s ease-in-out infinite;
}

.orb-1{
  width: 150px;
  height: 150px;
  background: radial-gradient(circle, rgba(79, 172, 254, 0.6), transparent);
  top: 10%;
  left: 10%;
  animation-delay: 0s;
}

.orb-2{
  width: 120px;
  height: 120px;
  background: radial-gradient(circle, rgba(0, 242, 254, 0.5), transparent);
  bottom: 20%;
  right: 15%;
  animation-delay: 2s;
}

.orb-3{
  width: 100px;
  height: 100px;
  background: radial-gradient(circle, rgba(67, 233, 123, 0.5), transparent);
  top: 50%;
  right: 10%;
  animation-delay: 4s;
}

@keyframes float-orb{
  0%, 100% { transform: translate(0, 0); }
  33% { transform: translate(20px, -20px); }
  66% { transform: translate(-20px, 20px); }
}

/* Code lines decoration */
.code-lines{
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 60%;
  display: flex;
  flex-direction: column;
  gap: 12px;
  opacity: 0.3;
  pointer-events: none;
}

.code-line{
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--accent-color), transparent);
  border-radius: 2px;
  animation: codeLine 3s ease-in-out infinite;
  animation-delay: var(--delay);
}

@keyframes codeLine{
  0%, 100% { width: 40%; opacity: 0.3; }
  50% { width: 80%; opacity: 0.6; }
}

/* Buttons */
.btn{
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  border-radius: 12px;
  padding: 0.875rem 1.5rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  font-size: 1rem;
  transition: all var(--transition);
  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, 0.2);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

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

.btn-primary{
  background: linear-gradient(135deg, var(--accent-color), var(--accent-secondary));
  color: var(--bg);
  box-shadow: 0 4px 15px rgba(79, 172, 254, 0.4);
}

.btn-primary:hover{
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(79, 172, 254, 0.6);
}

.btn-primary:active{
  transform: translateY(0);
}

.btn-outline{
  border: 2px solid rgba(255, 255, 255, 0.15);
  color: var(--white);
  background: rgba(255, 255, 255, 0.03);
  backdrop-filter: blur(10px);
}

.btn-outline:hover{
  border-color: var(--accent-color);
  background: rgba(79, 172, 254, 0.1);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(79, 172, 254, 0.2);
}

.btn svg{
  position: relative;
  z-index: 1;
  transition: transform var(--transition);
}

.btn:hover svg{
  transform: translateX(3px);
}

.btn span{
  position: relative;
  z-index: 1;
}

/* Sections */
.section{
  padding: 5rem 0;
  position: relative;
}

.section-inner{
  padding: 1.5rem 0;
}

.section-alt{
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), transparent);
  position: relative;
}

.section-alt::before{
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
}

.section-header{
  text-align: center;
  margin-bottom: 3rem;
}

.section-badge{
  display: inline-block;
  padding: 0.5rem 1rem;
  background: linear-gradient(135deg, rgba(79, 172, 254, 0.15), rgba(67, 233, 123, 0.1));
  border: 1px solid rgba(79, 172, 254, 0.3);
  border-radius: 50px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent-color);
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Cards grid */
.cards-grid{
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.card{
  background: var(--card);
  padding: 2rem;
  border-radius: 16px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(255, 255, 255, 0.05);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.card::before{
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-color), var(--accent-secondary), var(--accent-tertiary));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

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

.card:hover{
  transform: translateY(-8px);
  box-shadow: 0 12px 40px rgba(79, 172, 254, 0.2);
  border-color: rgba(79, 172, 254, 0.3);
}

.card-icon{
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, rgba(79, 172, 254, 0.2), rgba(67, 233, 123, 0.1));
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  color: var(--accent-color);
  transition: all var(--transition);
}

.card:hover .card-icon{
  transform: rotateY(360deg);
  background: linear-gradient(135deg, rgba(79, 172, 254, 0.3), rgba(67, 233, 123, 0.2));
}

.card h3{
  margin: 0 0 1rem 0;
  font-size: 1.25rem;
  color: var(--white);
}

.card p{
  color: var(--muted);
  line-height: 1.7;
  margin: 0 0 1.5rem 0;
}

.card-link{
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--accent-color);
  text-decoration: none;
  font-weight: 600;
  transition: all var(--transition);
}

.card-link:hover{
  gap: 0.75rem;
  color: var(--accent-secondary);
}

/* About section */
.about-content{
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.about-text{
  font-size: 1.125rem;
  line-height: 1.8;
  color: var(--muted);
  margin-bottom: 2rem;
}

.social-links{
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.social-link{
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.875rem 1.5rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  color: var(--white);
  text-decoration: none;
  font-weight: 500;
  transition: all var(--transition);
}

.social-link:hover{
  background: rgba(79, 172, 254, 0.1);
  border-color: var(--accent-color);
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(79, 172, 254, 0.3);
}

.social-link svg{
  transition: transform var(--transition);
}

.social-link:hover svg{
  transform: scale(1.1) rotate(5deg);
}

/* Skills */
.skills-list{
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 0;
  margin: 0;
  list-style: none;
  justify-content: center;
  max-width: 900px;
  margin: 0 auto;
}

.skills-list li{
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.02));
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 0.75rem 1.25rem;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 500;
  transition: all var(--transition);
  cursor: default;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.skills-list li:hover{
  background: linear-gradient(135deg, rgba(79, 172, 254, 0.15), rgba(67, 233, 123, 0.1));
  border-color: var(--accent-color);
  transform: translateY(-3px) scale(1.05);
  box-shadow: 0 6px 20px rgba(79, 172, 254, 0.3);
}

.skill-icon{
  font-size: 1.25rem;
}

/* Contact grid */
.contact-grid{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.contact-info{
  position: sticky;
  top: 100px;
}

.contact-info .section-header{
  text-align: left;
  margin-bottom: 1.5rem;
}

.contact-description{
  color: var(--muted);
  line-height: 1.7;
  margin-bottom: 2rem;
}

.contact-methods{
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.contact-method{
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.25rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  text-decoration: none;
  color: var(--white);
  transition: all var(--transition);
}

.contact-method:hover{
  background: rgba(79, 172, 254, 0.1);
  border-color: var(--accent-color);
  transform: translateX(8px);
  box-shadow: 0 4px 20px rgba(79, 172, 254, 0.2);
}

.method-icon{
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, rgba(79, 172, 254, 0.2), rgba(67, 233, 123, 0.1));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-color);
  flex-shrink: 0;
  transition: all var(--transition);
}

.contact-method:hover .method-icon{
  transform: rotate(5deg) scale(1.1);
  background: linear-gradient(135deg, rgba(79, 172, 254, 0.3), rgba(67, 233, 123, 0.2));
}

.contact-method div:last-child{
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.contact-method strong{
  font-weight: 600;
  color: var(--white);
}

.contact-method span{
  font-size: 0.875rem;
  color: var(--muted);
}
.contact-form{
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 2rem;
  border-radius: 16px;
  backdrop-filter: blur(10px);
}

.contact-form input,
.contact-form textarea{
  width: 100%;
  padding: 0.875rem 1rem;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.03);
  color: var(--white);
  font-family: inherit;
  font-size: 1rem;
  transition: all var(--transition);
  resize: vertical;
}

.contact-form input:focus,
.contact-form textarea:focus{
  outline: none;
  border-color: var(--accent-color);
  background: rgba(79, 172, 254, 0.05);
  box-shadow: 0 0 0 3px rgba(79, 172, 254, 0.1);
}

.contact-form input::placeholder,
.contact-form textarea::placeholder{
  color: var(--muted);
}

.contact-form label{
  display: block;
  margin-bottom: 1rem;
}

.contact-form button{
  margin-top: 0.5rem;
  width: 100%;
  justify-content: center;
}

/* Footer */
.site-footer{
  padding: 2rem 0;
  text-align: center;
  color: var(--muted);
  font-size: 0.95rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  background: rgba(0, 0, 0, 0.2);
}

/* Responsive Design */

/* Tablets and below */
@media (max-width: 1024px){
  .hero-grid{
    gap: 2rem;
  }
  
  .card-visual{
    height: 350px;
  }
}

/* Mobile devices */
@media (max-width: 880px){
  .container{
    padding: 1rem;
  }
  
  .hero{
    padding-top: 100px;
    padding-bottom: 3rem;
    min-height: auto;
  }
  
  .hero-grid{
    grid-template-columns: 1fr;
    text-align: center;
    gap: 2rem;
  }
  
  .hero-content h1{
    font-size: clamp(2rem, 8vw, 3rem);
  }
  
  .lead{
    max-width: 100%;
  }
  
  .hero-cta{
    justify-content: center;
  }
  
  .hero-visual{
    margin: 0 auto;
  }
  
  .card-visual{
    max-width: 100%;
    height: 300px;
  }
  
  .contact-grid{
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .contact-info{
    position: relative;
    top: 0;
  }
  
  .contact-info .section-header{
    text-align: center;
  }
  
  .section{
    padding: 3rem 0;
  }
  
  .section-header{
    margin-bottom: 2rem;
  }
  
  .cards-grid{
    grid-template-columns: 1fr;
  }
  
  /* Mobile Navigation */
  .nav-list{
    display: none;
    flex-direction: column;
    background: rgba(10, 14, 26, 0.98);
    backdrop-filter: blur(20px);
    padding: 1.5rem;
    border-radius: 16px;
    position: fixed;
    top: 80px;
    right: 1rem;
    left: 1rem;
    min-width: auto;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.1);
    animation: slideDown 0.3s ease-out;
  }
  
  @keyframes slideDown{
    from{
      opacity: 0;
      transform: translateY(-20px);
    }
    to{
      opacity: 1;
      transform: translateY(0);
    }
  }
  
  .nav-list.show{
    display: flex;
  }
  
  .nav-link{
    padding: 0.75rem 1rem;
    width: 100%;
    text-align: center;
  }
  
  .nav-toggle{
    display: block;
  }
}

/* Small mobile devices */
@media (max-width: 480px){
  .btn{
    padding: 0.75rem 1.25rem;
    font-size: 0.9375rem;
  }
  
  .hero-cta{
    flex-direction: column;
    width: 100%;
  }
  
  .hero-cta .btn{
    width: 100%;
    justify-content: center;
  }
  
  .social-links{
    flex-direction: column;
  }
  
  .social-link{
    width: 100%;
    justify-content: center;
  }
  
  .card{
    padding: 1.5rem;
  }
  
  .skills-list li{
    padding: 0.625rem 1rem;
    font-size: 0.9375rem;
  }
}

/* Accessibility */
.sr-only{
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Focus visible for keyboard navigation */
*:focus-visible{
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}

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