/* BitBlockerChain - Modern Blockchain Education Platform */

/* CSS Variables for Theme */
:root {
  --primary-color: #00d4ff;
  --secondary-color: #00ff88;
  --bg-dark: #0a0e1a;
  --bg-darker: #050810;
  --bg-card: #131825;
  --text-primary: #ffffff;
  --text-secondary: #b8c5d6;
  --shadow-glow: 0 0 20px rgba(0, 212, 255, 0.3);
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.5);
  --gradient-primary: linear-gradient(135deg, #00d4ff 0%, #0066ff 100%);
  --gradient-secondary: linear-gradient(135deg, #00ff88 0%, #00aa5e 100%);
  --transition: all 0.3s ease;
}

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

body {
  font-family: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

html {
  scroll-behavior: smooth;
}

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

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header & Navigation */
header {
  background: rgba(10, 14, 26, 0.95);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 1000;
  border-bottom: 1px solid rgba(0, 212, 255, 0.2);
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
}

.logo {
  font-size: 1.8rem;
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.nav-links a {
  color: var(--text-secondary);
  font-weight: 500;
  position: relative;
  padding: 0.5rem 0;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--primary-color);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: width 0.3s ease;
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

/* Mobile Menu */
.menu-toggle {
  display: none;
  flex-direction: column;
  cursor: pointer;
  gap: 5px;
}

.menu-toggle span {
  width: 25px;
  height: 3px;
  background: var(--primary-color);
  border-radius: 3px;
  transition: var(--transition);
}

.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -6px);
}

/* Hero Section */
.hero {
  position: relative;
  min-height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 4rem 0;
  background: linear-gradient(135deg, rgba(0, 102, 255, 0.1) 0%, rgba(0, 255, 136, 0.1) 100%);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="100" height="100" patternUnits="userSpaceOnUse"><path d="M 100 0 L 0 0 0 100" fill="none" stroke="rgba(0,212,255,0.1)" stroke-width="1"/></pattern></defs><rect width="100%" height="100%" fill="url(%23grid)"/></svg>');
  opacity: 0.3;
}

/* Animated Floating Crypto Background */
.crypto-background {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  overflow: hidden;
  z-index: 1;
}

.crypto-icon {
  position: absolute;
  font-size: 3rem;
  color: var(--primary-color);
  opacity: 0.15;
  animation: float 6s ease-in-out infinite;
}

.crypto-icon:nth-child(2n) {
  color: var(--secondary-color);
}

@keyframes float {
  0%, 100% {
    transform: translateY(0) rotate(0deg);
  }
  50% {
    transform: translateY(-30px) rotate(180deg);
  }
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  animation: fadeInUp 1s ease;
}

.hero h1 {
  font-size: 3.5rem;
  margin-bottom: 1.5rem;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.3rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 1rem 2.5rem;
  border-radius: 50px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  font-size: 1rem;
}

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

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 0 30px rgba(0, 212, 255, 0.5);
}

.btn-secondary {
  background: transparent;
  color: var(--primary-color);
  border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
  background: var(--primary-color);
  color: white;
}

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

.section-title {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 1rem;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: 3rem;
  font-size: 1.1rem;
}

/* Cards */
.card {
  background: var(--bg-card);
  border-radius: 20px;
  padding: 2rem;
  box-shadow: var(--shadow-card);
  border: 1px solid rgba(0, 212, 255, 0.1);
  transition: var(--transition);
  height: 100%;
}

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

.card-icon {
  font-size: 3rem;
  margin-bottom: 1.5rem;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.card h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.card p {
  color: var(--text-secondary);
  line-height: 1.8;
}

/* Grid Layouts */
.grid {
  display: grid;
  gap: 2rem;
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* Features Section */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

/* Image Slider */
.slider-section {
  background: var(--bg-darker);
  padding: 5rem 0;
}

.swiper {
  width: 100%;
  padding: 2rem 0;
}

.swiper-slide {
  background: var(--bg-card);
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid rgba(0, 212, 255, 0.2);
}

.swiper-slide img {
  width: 100%;
  height: 400px;
  object-fit: cover;
}

.slide-content {
  padding: 2rem;
}

.slide-content h3 {
  font-size: 1.8rem;
  margin-bottom: 1rem;
  color: var(--primary-color);
}

.slide-content p {
  color: var(--text-secondary);
}

.swiper-button-next,
.swiper-button-prev {
  color: var(--primary-color);
}

.swiper-pagination-bullet-active {
  background: var(--primary-color);
}

/* Testimonials */
.testimonial-card {
  background: var(--bg-card);
  border-radius: 20px;
  padding: 2rem;
  border: 1px solid rgba(0, 212, 255, 0.2);
  position: relative;
}

.testimonial-card::before {
  content: '"';
  position: absolute;
  top: -10px;
  left: 20px;
  font-size: 5rem;
  color: var(--primary-color);
  opacity: 0.3;
}

.testimonial-text {
  font-style: italic;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  padding-top: 2rem;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.author-img {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
}

.author-info h4 {
  color: var(--text-primary);
  margin-bottom: 0.2rem;
}

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

/* Newsletter */
.newsletter {
  background: var(--bg-card);
  border-radius: 20px;
  padding: 3rem;
  margin: 3rem 0;
  text-align: center;
  border: 1px solid rgba(0, 212, 255, 0.2);
}

.newsletter h2 {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.newsletter-form {
  display: flex;
  gap: 1rem;
  max-width: 500px;
  margin: 2rem auto 0;
}

.newsletter-form input {
  flex: 1;
  padding: 1rem 1.5rem;
  border-radius: 50px;
  border: 1px solid rgba(0, 212, 255, 0.3);
  background: var(--bg-darker);
  color: var(--text-primary);
  font-size: 1rem;
}

.newsletter-form input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: var(--shadow-glow);
}

/* Footer */
footer {
  background: var(--bg-darker);
  padding: 3rem 0 1.5rem;
  border-top: 1px solid rgba(0, 212, 255, 0.2);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 3rem;
  margin-bottom: 2rem;
}

.footer-section h3 {
  margin-bottom: 1.5rem;
  color: var(--primary-color);
}

.footer-section ul {
  list-style: none;
}

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

.footer-section a:hover {
  color: var(--primary-color);
}

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

.social-links a {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--bg-card);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(0, 212, 255, 0.3);
  transition: var(--transition);
}

.social-links a:hover {
  background: var(--primary-color);
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid rgba(0, 212, 255, 0.1);
  color: var(--text-secondary);
}

/* Pricing Table */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.pricing-card {
  background: var(--bg-card);
  border-radius: 20px;
  padding: 2.5rem;
  text-align: center;
  border: 1px solid rgba(0, 212, 255, 0.2);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.pricing-card.featured {
  border-color: var(--primary-color);
  transform: scale(1.05);
}

.pricing-card.featured::before {
  content: 'POPULAR';
  position: absolute;
  top: 20px;
  right: -35px;
  background: var(--gradient-primary);
  color: white;
  padding: 5px 40px;
  transform: rotate(45deg);
  font-size: 0.8rem;
  font-weight: 700;
}

.pricing-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-glow);
}

.price {
  font-size: 3rem;
  font-weight: 700;
  color: var(--primary-color);
  margin: 1rem 0;
}

.price span {
  font-size: 1.2rem;
  color: var(--text-secondary);
}

.pricing-features {
  list-style: none;
  margin: 2rem 0;
  text-align: left;
}

.pricing-features li {
  padding: 0.8rem 0;
  color: var(--text-secondary);
  border-bottom: 1px solid rgba(0, 212, 255, 0.1);
}

.pricing-features li i {
  color: var(--secondary-color);
  margin-right: 0.5rem;
}

/* Contact Form */
.contact-form {
  background: var(--bg-card);
  border-radius: 20px;
  padding: 2.5rem;
  border: 1px solid rgba(0, 212, 255, 0.2);
}

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

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 1rem;
  border-radius: 10px;
  border: 1px solid rgba(0, 212, 255, 0.3);
  background: var(--bg-darker);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 1rem;
  transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: var(--shadow-glow);
}

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

.error-message {
  color: #ff4444;
  font-size: 0.9rem;
  margin-top: 0.3rem;
  display: none;
}

.error-message.show {
  display: block;
}

/* FAQ Accordion */
.faq-item {
  background: var(--bg-card);
  border-radius: 10px;
  margin-bottom: 1rem;
  border: 1px solid rgba(0, 212, 255, 0.2);
  overflow: hidden;
}

.faq-question {
  padding: 1.5rem;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition);
}

.faq-question:hover {
  background: rgba(0, 212, 255, 0.1);
}

.faq-question h3 {
  font-size: 1.1rem;
  color: var(--text-primary);
}

.faq-question i {
  color: var(--primary-color);
  transition: transform 0.3s ease;
}

.faq-question.active i {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.faq-answer-content {
  padding: 0 1.5rem 1.5rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* Timeline */
.timeline {
  position: relative;
  padding: 2rem 0;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--gradient-primary);
  transform: translateX(-50%);
}

.timeline-item {
  display: flex;
  margin-bottom: 3rem;
  position: relative;
}

.timeline-item:nth-child(odd) {
  flex-direction: row;
}

.timeline-item:nth-child(even) {
  flex-direction: row-reverse;
}

.timeline-content {
  background: var(--bg-card);
  border-radius: 15px;
  padding: 2rem;
  width: calc(50% - 30px);
  border: 1px solid rgba(0, 212, 255, 0.2);
}

.timeline-date {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-primary);
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-weight: 600;
  white-space: nowrap;
}

/* Team Section */
.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.team-member {
  text-align: center;
  background: var(--bg-card);
  border-radius: 20px;
  padding: 2rem;
  border: 1px solid rgba(0, 212, 255, 0.2);
  transition: var(--transition);
}

.team-member:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-glow);
}

.team-photo {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  margin: 0 auto 1.5rem;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  color: white;
  border: 3px solid var(--primary-color);
}

.team-member h3 {
  margin-bottom: 0.5rem;
}

.team-member .role {
  color: var(--primary-color);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

/* Blog Cards */
.blog-card {
  background: var(--bg-card);
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid rgba(0, 212, 255, 0.2);
  transition: var(--transition);
}

.blog-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-glow);
}

.blog-image {
  width: 100%;
  height: 250px;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  color: white;
}

.blog-content {
  padding: 2rem;
}

.blog-meta {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.blog-tag {
  background: rgba(0, 212, 255, 0.2);
  color: var(--primary-color);
  padding: 0.3rem 0.8rem;
  border-radius: 20px;
  font-size: 0.85rem;
}

.blog-date {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.blog-card h3 {
  margin-bottom: 1rem;
  color: var(--text-primary);
}

/* Tutorial Cards */
.tutorial-card {
  background: var(--bg-card);
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid rgba(0, 212, 255, 0.2);
  transition: var(--transition);
}

.tutorial-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-glow);
}

.tutorial-icon {
  height: 200px;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 5rem;
  color: white;
}

.tutorial-content {
  padding: 2rem;
}

.tutorial-level {
  display: inline-block;
  background: rgba(0, 255, 136, 0.2);
  color: var(--secondary-color);
  padding: 0.3rem 0.8rem;
  border-radius: 20px;
  font-size: 0.85rem;
  margin-bottom: 1rem;
}

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

.fade-in {
  opacity: 0;
  animation: fadeInUp 0.8s ease forwards;
}

.fade-in-delay-1 {
  animation-delay: 0.2s;
}

.fade-in-delay-2 {
  animation-delay: 0.4s;
}

.fade-in-delay-3 {
  animation-delay: 0.6s;
}

/* Map Container */
.map-container {
  border-radius: 20px;
  overflow: hidden;
  height: 400px;
  border: 1px solid rgba(0, 212, 255, 0.2);
}

.map-container iframe {
  width: 100%;
  height: 100%;
  border: none;
}

/* Responsive Design */
@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    left: -100%;
    top: 70px;
    flex-direction: column;
    background: rgba(10, 14, 26, 0.98);
    width: 100%;
    text-align: center;
    transition: 0.3s;
    padding: 2rem 0;
    gap: 1rem;
    border-top: 1px solid rgba(0, 212, 255, 0.2);
  }

  .nav-links.active {
    left: 0;
  }

  .menu-toggle {
    display: flex;
  }

  .hero h1 {
    font-size: 2.5rem;
  }

  .hero p {
    font-size: 1.1rem;
  }

  .section-title {
    font-size: 2rem;
  }

  .newsletter-form {
    flex-direction: column;
  }

  .timeline::before {
    left: 0;
  }

  .timeline-item {
    flex-direction: column !important;
  }

  .timeline-content {
    width: 100%;
    margin-left: 30px;
  }

  .timeline-date {
    left: 0;
    transform: none;
    top: 0;
  }

  .pricing-card.featured {
    transform: scale(1);
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 2rem;
  }

  .btn {
    padding: 0.8rem 1.5rem;
    font-size: 0.9rem;
  }

  .card {
    padding: 1.5rem;
  }
}

/* Blog Post Styles */
.blog-post {
  color: var(--text-primary);
}

.blog-header {
  position: relative;
  margin-bottom: 3rem;
}

.blog-header img {
  filter: brightness(0.7);
}

.blog-header-content {
  position: absolute;
  bottom: 2rem;
  left: 0;
  right: 0;
  color: white;
  z-index: 10;
}

.blog-header h1 {
  font-size: 3rem;
  line-height: 1.2;
  margin-bottom: 1rem;
  text-shadow: 2px 2px 10px rgba(0, 0, 0, 0.8);
}

.blog-content {
  line-height: 1.8;
}

.blog-content .lead {
  font-size: 1.3rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  font-weight: 400;
  line-height: 1.6;
}

.blog-content h2 {
  color: var(--primary-color);
  font-size: 2rem;
  margin-top: 3rem;
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid rgba(0, 212, 255, 0.3);
}

.blog-content h3 {
  color: var(--secondary-color);
  font-size: 1.5rem;
  margin-top: 2rem;
  margin-bottom: 1rem;
}

.blog-content p {
  margin-bottom: 1.5rem;
  color: var(--text-secondary);
}

.blog-content ul,
.blog-content ol {
  margin: 1.5rem 0;
  margin-left: 2rem;
  color: var(--text-secondary);
}

.blog-content li {
  margin-bottom: 0.8rem;
  line-height: 1.8;
}

.blog-content code {
  background: var(--bg-card);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  font-family: 'Courier New', monospace;
  color: var(--secondary-color);
  font-size: 0.9em;
}

.blog-content strong {
  color: var(--primary-color);
  font-weight: 600;
}

/* Utility Classes */
.text-center {
  text-align: center;
}

.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mt-3 { margin-top: 3rem; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }
.mb-3 { margin-bottom: 3rem; }