/* Blockchain Portfolio Website - Main Stylesheet */

/* Variables for theme colors */
:root {
  /* Light Theme Colors */
  --light-bg-primary: #f8f9fa;
  --light-bg-secondary: #e9ecef;
  --light-text-primary: #212529;
  --light-text-secondary: #495057;
  --light-accent-primary: #4361ee;
  --light-accent-secondary: #3a0ca3;
  --light-border: #dee2e6;
  --light-card-bg: #ffffff;
  --light-shadow: rgba(0, 0, 0, 0.1);
  
  /* Dark Theme Colors */
  --dark-bg-primary: #121212;
  --dark-bg-secondary: #1e1e1e;
  --dark-text-primary: #f8f9fa;
  --dark-text-secondary: #adb5bd;
  --dark-accent-primary: #4cc9f0;
  --dark-accent-secondary: #7209b7;
  --dark-border: #2d2d2d;
  --dark-card-bg: #1a1a1a;
  --dark-shadow: rgba(0, 0, 0, 0.3);
  
  /* Default theme (light) */
  --bg-primary: var(--light-bg-primary);
  --bg-secondary: var(--light-bg-secondary);
  --text-primary: var(--light-text-primary);
  --text-secondary: var(--light-text-secondary);
  --accent-primary: var(--light-accent-primary);
  --accent-secondary: var(--light-accent-secondary);
  --border: var(--light-border);
  --card-bg: var(--light-card-bg);
  --shadow: var(--light-shadow);
}

/* Dark theme class */
.dark-theme {
  --bg-primary: var(--dark-bg-primary);
  --bg-secondary: var(--dark-bg-secondary);
  --text-primary: var(--dark-text-primary);
  --text-secondary: var(--dark-text-secondary);
  --accent-primary: var(--dark-accent-primary);
  --accent-secondary: var(--dark-accent-secondary);
  --border: var(--dark-border);
  --card-bg: var(--dark-card-bg);
  --shadow: var(--dark-shadow);
}

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

body {
  font-family: 'Poppins', sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background-color 0.3s ease, color 0.3s ease;
}

a {
  text-decoration: none;
  color: var(--accent-primary);
  transition: color 0.3s ease;
}

a:hover {
  color: var(--accent-secondary);
}

ul {
  list-style: none;
}

img {
  max-width: 100%;
  height: auto;
}

/* Container */
.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 15px;
}

/* Header */
header {
  background-color: var(--bg-secondary);
  padding: 1rem 0;
  position: fixed;
  width: 100%;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 10px var(--shadow);
}

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

.logo {
  display: flex;
  align-items: center;
}

.logo img {
  height: 40px;
  margin-right: 10px;
}

.logo h1 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent-primary);
}

/* Navigation */
nav ul {
  display: flex;
}

nav ul li {
  margin-left: 1.5rem;
}

nav ul li a {
  color: var(--text-primary);
  font-weight: 500;
  position: relative;
}

nav ul li a::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--accent-primary);
  transition: width 0.3s ease;
}

nav ul li a:hover::after,
nav ul li a.active::after {
  width: 100%;
}

/* Theme toggle */
.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1.2rem;
  color: var(--text-primary);
  margin-left: 1.5rem;
  transition: color 0.3s ease;
}

.theme-toggle:hover {
  color: var(--accent-primary);
}

/* Mobile menu */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1.5rem;
  color: var(--text-primary);
}

/* Hero section */
.hero {
  padding: 8rem 0 5rem;
  background: linear-gradient(135deg, var(--bg-primary), var(--bg-secondary));
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: url('../images/blockchain-pattern.svg');
  background-size: cover;
  opacity: 0.1;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
}

.hero h2 {
  font-size: 3rem;
  margin-bottom: 1rem;
  background: linear-gradient(to right, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero p {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 700px;
  margin: 0 auto 2rem;
}

.btn {
  display: inline-block;
  padding: 0.8rem 1.5rem;
  background-color: var(--accent-primary);
  color: white;
  border-radius: 5px;
  font-weight: 500;
  transition: background-color 0.3s ease, transform 0.2s ease;
}

.btn:hover {
  background-color: var(--accent-secondary);
  transform: translateY(-3px);
  color: white;
}

/* Section styling */
section {
  padding: 5rem 0;
}

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

.section-title h2 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  position: relative;
  display: inline-block;
}

.section-title h2::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 50px;
  height: 3px;
  background: linear-gradient(to right, var(--accent-primary), var(--accent-secondary));
}

.section-title p {
  color: var(--text-secondary);
}

/* About section */
.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.about-image {
  position: relative;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 10px 30px var(--shadow);
}

.about-image::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  opacity: 0.3;
}

.about-text h3 {
  font-size: 1.8rem;
  margin-bottom: 1rem;
  color: var(--accent-primary);
}

.about-text p {
  margin-bottom: 1.5rem;
}

.blockchain-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 2rem;
}

.stat-item {
  background-color: var(--card-bg);
  padding: 1.5rem;
  border-radius: 10px;
  text-align: center;
  box-shadow: 0 5px 15px var(--shadow);
  transition: transform 0.3s ease;
}

.stat-item:hover {
  transform: translateY(-5px);
}

.stat-item h4 {
  font-size: 2rem;
  color: var(--accent-primary);
  margin-bottom: 0.5rem;
}

.stat-item p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 0;
}

/* Services section */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.service-card {
  background-color: var(--card-bg);
  border-radius: 10px;
  padding: 2rem;
  text-align: center;
  box-shadow: 0 5px 15px var(--shadow);
  transition: transform 0.3s ease;
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 5px;
  background: linear-gradient(to right, var(--accent-primary), var(--accent-secondary));
}

.service-card:hover {
  transform: translateY(-10px);
}

.service-icon {
  font-size: 3rem;
  color: var(--accent-primary);
  margin-bottom: 1.5rem;
}

.service-card h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.service-card p {
  color: var(--text-secondary);
}

/* Gallery section */
.gallery-filters {
  display: flex;
  justify-content: center;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.filter-btn {
  background: none;
  border: none;
  padding: 0.5rem 1rem;
  margin: 0.5rem;
  cursor: pointer;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.3s ease;
}

.filter-btn.active,
.filter-btn:hover {
  color: var(--accent-primary);
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1.5rem;
}

.gallery-item {
  position: relative;
  border-radius: 10px;
  overflow: hidden;
  aspect-ratio: 1/1;
  cursor: pointer;
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.gallery-item:hover img {
  transform: scale(1.1);
}

.gallery-item-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.7), transparent);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 1.5rem;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.gallery-item:hover .gallery-item-overlay {
  opacity: 1;
}

.gallery-item-overlay h4 {
  color: white;
  margin-bottom: 0.5rem;
}

.gallery-item-overlay p {
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.9rem;
}

/* Contact section */
.contact-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

.contact-info {
  background-color: var(--card-bg);
  padding: 2rem;
  border-radius: 10px;
  box-shadow: 0 5px 15px var(--shadow);
}

.contact-info h3 {
  font-size: 1.8rem;
  margin-bottom: 1.5rem;
  color: var(--accent-primary);
}

.contact-info-item {
  display: flex;
  align-items: flex-start;
  margin-bottom: 1.5rem;
}

.contact-info-icon {
  font-size: 1.5rem;
  color: var(--accent-primary);
  margin-right: 1rem;
}

.contact-info-text h4 {
  margin-bottom: 0.5rem;
}

.contact-info-text p {
  color: var(--text-secondary);
}

.contact-form {
  background-color: var(--card-bg);
  padding: 2rem;
  border-radius: 10px;
  box-shadow: 0 5px 15px var(--shadow);
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
}

.form-control {
  width: 100%;
  padding: 0.8rem;
  border: 1px solid var(--border);
  border-radius: 5px;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  transition: border-color 0.3s ease;
}

.form-control:focus {
  outline: none;
  border-color: var(--accent-primary);
}

textarea.form-control {
  resize: vertical;
  min-height: 150px;
}

/* Footer */
footer {
  background-color: var(--bg-secondary);
  padding: 3rem 0 1rem;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-column h3 {
  font-size: 1.2rem;
  margin-bottom: 1.5rem;
  position: relative;
  padding-bottom: 0.5rem;
}

.footer-column h3::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background-color: var(--accent-primary);
}

.footer-column ul li {
  margin-bottom: 0.8rem;
}

.footer-column ul li a {
  color: var(--text-secondary);
  transition: color 0.3s ease;
}

.footer-column ul li a:hover {
  color: var(--accent-primary);
}

.social-links {
  display: flex;
  gap: 1rem;
}

.social-links a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: var(--bg-primary);
  border-radius: 50%;
  color: var(--text-primary);
  transition: background-color 0.3s ease, color 0.3s ease;
}

.social-links a:hover {
  background-color: var(--accent-primary);
  color: white;
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.footer-bottom p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Blockchain animation elements */
.blockchain-nodes {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  z-index: 0;
}

.node {
  position: absolute;
  width: 5px;
  height: 5px;
  background-color: var(--accent-primary);
  border-radius: 50%;
  opacity: 0.5;
}

.connection {
  position: absolute;
  height: 1px;
  background-color: var(--accent-primary);
  opacity: 0.2;
  transform-origin: left center;
}

/* Responsive styles */
@media (max-width: 992px) {
  .about-content {
    grid-template-columns: 1fr;
  }
  
  .contact-container {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .mobile-menu-btn {
    display: block;
  }
  
  nav {
    position: fixed;
    top: 70px;
    left: -100%;
    width: 80%;
    height: calc(100vh - 70px);
    background-color: var(--bg-secondary);
    transition: left 0.3s ease;
    z-index: 1000;
  }
  
  nav.active {
    left: 0;
  }
  
  nav ul {
    flex-direction: column;
    padding: 2rem;
  }
  
  nav ul li {
    margin: 1rem 0;
  }
  
  .hero h2 {
    font-size: 2.5rem;
  }
  
  .blockchain-stats {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 576px) {
  .hero h2 {
    font-size: 2rem;
  }
  
  .section-title h2 {
    font-size: 2rem;
  }
  
  .gallery-grid {
    grid-template-columns: 1fr;
  }
}

/* Animation keyframes */
@keyframes float {
  0% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
  100% {
    transform: translateY(0);
  }
}

@keyframes pulse {
  0% {
    transform: scale(1);
    opacity: 0.5;
  }
  50% {
    transform: scale(1.2);
    opacity: 0.8;
  }
  100% {
    transform: scale(1);
    opacity: 0.5;
  }
}

/* Utility classes */
.text-gradient {
  background: linear-gradient(to right, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.animate-float {
  animation: float 5s ease-in-out infinite;
}

.animate-pulse {
  animation: pulse 3s ease-in-out infinite;
}