/* Navbar */
#navbar {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 1000;
  padding: 1.5rem 0;
  transition: var(--transition);
  background: transparent;
}

#navbar.scrolled {
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  padding: 1rem 0;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
}

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

.nav-logo {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-link {
  font-weight: 500;
  position: relative;
  padding-bottom: 5px;
}

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

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

.hamburger {
  display: none;
  cursor: pointer;
  z-index: 1001;
}

.hamburger span {
  display: block;
  width: 25px;
  height: 3px;
  background: var(--text-primary);
  margin: 5px 0;
  transition: var(--transition);
}

.hamburger.active span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

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

.hamburger.active span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* Hero */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  background: linear-gradient(rgba(248, 250, 252, 0.8), rgba(241, 245, 249, 0.9)), url('https://images.unsplash.com/photo-1460925895917-afdab827c52f?auto=format&fit=crop&w=1200&q=80') center/cover;
}

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

.hero-text {
  max-width: 800px;
}

.hero-tagline {
  color: var(--accent-2);
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 1rem;
  display: block;
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  margin-bottom: 1rem;
}

.hero-subtitle {
  font-size: 1.5rem;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 2rem;
  font-family: 'Space Grotesk', sans-serif;
}

.hero-ctas {
  display: flex;
  gap: 1rem;
  margin-bottom: 3rem;
}

.hero-social {
  display: flex;
  gap: 1.5rem;
}

.social-link {
  font-size: 1.5rem;
  color: var(--text-secondary);
}

.social-link:hover {
  color: var(--accent-1);
  text-shadow: var(--glow-purple);
  transform: translateY(-3px);
}

/* About */
.about-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.about-image {
  position: relative;
  border-radius: var(--border-radius);
  background: var(--gradient-primary);
  padding: 3px;
  box-shadow: var(--glow-purple);
}

.about-image img {
  border-radius: calc(var(--border-radius) - 3px);
}

.about-skills {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin: 2rem 0;
}

.skill-tag {
  padding: 0.5rem 1.5rem;
  border-radius: 50px;
  background: var(--bg-card);
  border: 1px solid rgba(124, 58, 237, 0.3);
  font-size: 0.9rem;
  font-weight: 500;
  transition: var(--transition);
}

.skill-tag:hover {
  border-color: var(--accent-2);
  box-shadow: var(--glow-cyan);
  transform: translateY(-2px);
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(0,0,0,0.1);
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 700;
  font-family: 'Space Grotesk', sans-serif;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: block;
}

.stat-label {
  color: var(--text-secondary);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* Services */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-bottom: 4rem;
}

.service-card {
  background: var(--bg-card);
  padding: 2.5rem 2rem;
  border-radius: var(--border-radius);
  border-top: 3px solid var(--accent-1);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  transition: var(--transition);
}

.service-card:hover {
  transform: translateY(-8px);
  background: var(--bg-card-hover);
  box-shadow: var(--glow-purple);
  border-top-color: var(--accent-2);
}

.service-icon {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
}

.service-title {
  font-size: 1.25rem;
  margin-bottom: 1rem;
}

.process-steps {
  display: flex;
  justify-content: space-between;
  position: relative;
  margin-top: 4rem;
}

.process-steps::before {
  content: '';
  position: absolute;
  top: 30px;
  left: 0;
  width: 100%;
  height: 2px;
  background: rgba(0,0,0,0.1);
  z-index: 1;
}

.process-step {
  position: relative;
  z-index: 2;
  text-align: center;
  width: 20%;
}

.step-number {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--bg-secondary);
  border: 2px solid var(--accent-1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 700;
  margin: 0 auto 1rem;
  box-shadow: var(--glow-purple);
}

/* Portfolio */
.portfolio-filters {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 3rem;
  flex-wrap: wrap;
}

.filter-btn {
  background: var(--bg-card);
  border: none;
  padding: 0.5rem 1.5rem;
  border-radius: 50px;
  color: var(--text-primary);
  cursor: pointer;
  transition: var(--transition);
  font-family: 'Space Grotesk', sans-serif;
}

.filter-btn:hover, .filter-btn.active {
  background: var(--gradient-primary);
  box-shadow: var(--glow-purple);
}

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

.portfolio-card {
  position: relative;
  border-radius: var(--border-radius);
  overflow: hidden;
  cursor: pointer;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
}

.portfolio-card.hide {
  display: none;
}

.portfolio-img {
  width: 100%;
  height: 300px;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.portfolio-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(to top, rgba(255,255,255,0.9), transparent);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 2rem;
  opacity: 0;
  transition: var(--transition);
}

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

.portfolio-card:hover .portfolio-overlay {
  opacity: 1;
}

.portfolio-title {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.portfolio-category {
  color: var(--accent-2);
  font-size: 0.9rem;
  text-transform: uppercase;
}

/* Portfolio Modal */
.portfolio-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(15, 23, 42, 0.85);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}

.portfolio-modal.active {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background: var(--bg-card);
  width: 90%;
  max-width: 1000px;
  border-radius: var(--border-radius);
  display: flex;
  position: relative;
  overflow: hidden;
  max-height: 90vh;
}

.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 2rem;
  cursor: pointer;
  z-index: 10;
  transition: var(--transition);
}

.modal-close:hover {
  color: var(--accent-3);
  transform: rotate(90deg);
}

.modal-body {
  display: flex;
  width: 100%;
}

.modal-img {
  width: 50%;
  object-fit: cover;
}

.modal-info {
  width: 50%;
  padding: 3rem;
  overflow-y: auto;
}

.modal-metrics {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(0,0,0,0.1);
}

.metric-item {
  background: var(--bg-secondary);
  padding: 1rem;
  border-radius: 8px;
}

/* Blog */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.blog-card {
  background: var(--bg-card);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  transition: var(--transition);
}

.blog-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--glow-purple);
}

.blog-img {
  position: relative;
  height: 200px;
}

.blog-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.blog-category {
  position: absolute;
  top: 1rem;
  left: 1rem;
  background: var(--gradient-primary);
  padding: 0.3rem 1rem;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 600;
}

.blog-content {
  padding: 1.5rem;
}

.blog-title {
  font-size: 1.2rem;
  margin-bottom: 1rem;
  transition: var(--transition);
}

.blog-card:hover .blog-title {
  color: var(--accent-2);
}

.blog-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(0,0,0,0.1);
}

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

/* Testimonials */
.testimonial-slider {
  overflow: hidden;
  position: relative;
  padding: 2rem 0;
}

.testimonial-track {
  display: flex;
  transition: transform 0.5s ease;
}

.testimonial-card {
  min-width: 100%;
  text-align: center;
  padding: 0 2rem;
}

.testimonial-text {
  font-size: 1.25rem;
  font-style: italic;
  margin-bottom: 2rem;
  position: relative;
}

.testimonial-rating {
  color: var(--accent-2);
  margin-bottom: 1.5rem;
}

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

.testimonial-avatar {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  padding: 2px;
  background: var(--gradient-primary);
}

.testimonial-avatar img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
}

.slider-dots {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 2rem;
}

.slider-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg-card);
  cursor: pointer;
  transition: var(--transition);
}

.slider-dot.active {
  background: var(--gradient-primary);
  box-shadow: var(--glow-purple);
}

/* Contact */
.contact-container {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: 4rem;
}

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

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

.form-input, .form-textarea {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid rgba(0,0,0,0.1);
  border-radius: 8px;
  padding: 1rem;
  color: var(--text-primary);
  font-family: inherit;
  transition: var(--transition);
}

.form-input:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--accent-1);
  box-shadow: var(--glow-purple);
}

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

.btn-submit {
  width: 100%;
}

.contact-info {
  background: var(--bg-card);
  padding: 3rem 2rem;
  border-radius: var(--border-radius);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
}

.info-item {
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

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

.contact-social {
  display: flex;
  gap: 1rem;
  margin-top: 3rem;
}

/* Footer */
#footer {
  background: var(--bg-secondary);
  padding: 3rem 0;
  text-align: center;
  border-top: 2px solid transparent;
  border-image: var(--gradient-primary);
  border-image-slice: 1;
}

.footer-text {
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
}

/* Back to top */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  cursor: pointer;
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  box-shadow: var(--glow-purple);
}

.back-to-top.active {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  transform: translateY(-5px);
}

/* Animations */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease;
}

.reveal-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: all 0.6s ease;
}

.reveal-right {
  opacity: 0;
  transform: translateX(30px);
  transition: all 0.6s ease;
}

.reveal-scale {
  opacity: 0;
  transform: scale(0.9);
  transition: all 0.6s ease;
}

.reveal.active, .reveal-left.active, .reveal-right.active, .reveal-scale.active {
  opacity: 1;
  transform: translate(0) scale(1);
}

/* Floating Zalo Button */
.zalo-float {
  position: fixed;
  bottom: 2rem;
  left: 2rem;
  background: linear-gradient(135deg, #0068ff, #0084ff);
  color: #ffffff;
  padding: 0.75rem 1.25rem;
  border-radius: 50px;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  font-family: 'Space Grotesk', sans-serif;
  box-shadow: 0 8px 25px rgba(0, 104, 255, 0.4);
  z-index: 999;
  transition: all 0.3s ease;
  animation: pulse-zalo 2s infinite;
  text-decoration: none;
}

.zalo-float i {
  font-size: 1.3rem;
}

.zalo-float:hover {
  transform: translateY(-5px) scale(1.05);
  box-shadow: 0 12px 30px rgba(0, 104, 255, 0.6);
  color: #ffffff;
}

@keyframes pulse-zalo {
  0% {
    box-shadow: 0 0 0 0 rgba(0, 104, 255, 0.6);
  }
  70% {
    box-shadow: 0 0 0 15px rgba(0, 104, 255, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(0, 104, 255, 0);
  }
}