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

:root {
  --primary-violet: #7c3aed;
  --secondary-violet: #a855f7;
  --accent-violet: #c084fc;
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-hover: rgba(255, 255, 255, 0.08);
  --text-primary: #ffffff;
  --text-secondary: #e2e8f0;
  --text-muted: #94a3b8;
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --shadow-glass: 0 8px 32px rgba(0, 0, 0, 0.3);
  --shadow-violet: 0 8px 32px rgba(124, 58, 237, 0.2);
  --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: radial-gradient(ellipse at top, var(--bg-secondary) 0%, var(--bg-primary) 70%);
  background-attachment: fixed;
  color: var(--text-primary);
  line-height: 1.6;
  font-weight: 300;
  overflow-x: hidden;
  min-height: 100vh;
}

#particles-js {
  position: fixed;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  z-index: -1;
  background: #1a1a2e;
}


#header {
  position: fixed;  
  margin-left: -1.2rem;
  margin-right: -1.2rem;
  margin-top: -.2rem;
  left: 20px;
  right: 20px;
  z-index: 1000;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition-smooth);
  background-color: rgba(0, 0, 0, 0.9);
}

.logo {
  font-size: 1.5rem;
  font-weight: 600;
  background: linear-gradient(135deg, var(--primary-violet), var(--accent-violet));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: 0.05em;
  position: relative;
}

#nav ul {
  display: flex;
  list-style: none;
  gap: 0.5rem;
}

#nav a {
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.5rem 1.25rem;
  border-radius: 10px;
  transition: var(--transition-smooth);
  display: inline-block;
  user-select: none;
}

#nav a:hover {
  background-color: var(--secondary-violet);
  color: white;
}

#nav a.active,
#nav a[aria-current="page"] {
  background-color: var(--primary-violet);
  color: white;
  font-weight: 600;
}

.menu-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  padding: 0.75rem;
  border-radius: 12px;
  cursor: pointer;
  backdrop-filter: blur(16px);
  transition: var(--transition-smooth);
}

@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }

  #nav {
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    right: 0;
    background-color: black;
    border-radius: 12px;
    max-height: 0;
    opacity: 0;
    visibility: hidden;
    overflow: hidden;
    transition: max-height 0.3s ease, opacity 0.3s ease;
  }

  #nav.show {
    max-height: 400px;
    opacity: 1;
    visibility: visible;
  }

  #nav ul {
    flex-direction: column;
    gap: 0;
  }

  #nav li {
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

  #nav a {
    display: block;
    padding: 1rem 1.5rem;
  }
}

.page-content {
  padding-top: 120px; 
  padding-bottom: 4rem; 
}

.credentials-title {
  font-size: 2.5rem;
  font-weight: 250;
  margin-bottom: 2.5rem;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  text-align: center;
  position: relative;
  width: fit-content;
  margin-left: auto;
  margin-right: auto;
}

.credentials-title::after {
  content: '';
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  bottom: -12px;
  width: 48%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--primary-violet), transparent);
  border-radius: 1px;
}

.credentials-section {
  padding: 3rem 0;
}

.credentials-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.certificate-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2.5rem;
  margin-top: 3rem;
}

.certificate-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-glass);
  border-radius: 18px;
  overflow: hidden;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  transition: var(--transition-smooth);
  position: relative; 
  opacity: 0;
  transform: translateY(30px);
}

.certificate-card.visible {
  opacity: 1;
  transform: translateY(0);
  box-shadow: var(--shadow-violet);
}

.certificate-card:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: var(--shadow-violet);
  background: var(--glass-hover);
}

.certificate-image {
  width: 100%;
  height: 200px; 
  object-fit: cover;
  display: block;
  transition: transform 0.3s ease;
}

.certificate-card:hover .certificate-image {
  transform: scale(1.05);
}

.certificate-content {
  padding: 1.2rem;
  text-align: center;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.certificate-name {
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--primary-violet);
  margin-bottom: 0.5rem;
  line-height: 1.3;
}

.certificate-issuer {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 400;
}

.education-section {
  padding: 3rem 0; 
  margin-top: 4rem; 
}

.education-item {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-glass);
  border-radius: 18px;
  padding: 2.1rem 2rem;
  margin-bottom: 1.5rem; 
  opacity: 0;
  transform: translateY(30px);
  transition: var(--transition-smooth);
}

.education-item.visible {
  opacity: 1;
  transform: translateY(0);
  box-shadow: var(--shadow-violet);
}

.education-item h3 {
  font-size: 1.4rem;
  font-weight: 500;
  color: var(--primary-violet);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.education-item h3 i {
  font-size: 1.5rem;
}

.education-entry {
  margin-bottom: 1.2rem;
  padding-left: 0.5rem; 
  border-left: 3px solid var(--glass-border); 
}

.degree-title {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text-primary);
}

.institution {
  font-size: 1rem;
  color: var(--accent-violet);
  margin-top: 0.2rem;
}

.status, .graduation-date {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: 0.1rem;
}


.modal {
  display: none; 
  position: fixed; 
  z-index: 2000;
  padding-top: 60px; 
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto; 
  background-color: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.modal-content {
  margin: auto;
  display: block;
  width: 80%;
  max-width: 700px;
  animation-name: zoom;
  animation-duration: 0.6s;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  padding: 20px;
}

.modal-image {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 15px;
}

.modal-content .certificate-title {
  margin-top: 15px;
  text-align: center;
  color: var(--text-primary);
  font-size: 1.5rem;
  font-weight: 500;
}

@keyframes zoom {
  from {transform: scale(0.1)}
  to {transform: scale(1)}
}

.close {
  position: absolute;
  top: 15px;
  right: 35px;
  color: var(--text-primary);
  font-size: 40px;
  font-weight: bold;
  transition: 0.3s;
  cursor: pointer;
  z-index: 2001;
}

.close:hover,
.close:focus {
  color: var(--primary-violet);
  text-decoration: none;
}


footer {
  background: var(--glass-bg);
  backdrop-filter: blur(24px);
  border-top: 1px solid var(--glass-border);
  padding: 2.5rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 300;
  margin-top: 4rem;
}

@media (max-width: 992px) {
  .credentials-title {
    font-size: 2rem;
  }
  .certificate-grid {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
  }
  .certificate-image {
    height: 180px;
  }
  .education-item {
    padding: 1.8rem 1.5rem;
  }
  .education-item h3 {
    font-size: 1.2rem;
  }
}

@media (max-width: 768px) {
  #header {
    top: 10px;
    left: 10px;
    right: 10px;
    padding: 0.75rem 1.5rem;
  }
  .menu-toggle {
    display: block;
  }
  #nav {
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    right: 0;
    background: var(--glass-bg);
    backdrop-filter: blur(24px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    transform: translateY(-10px);
    visibility: hidden;
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  }
  #nav.show {
    transform: translateY(0);
    visibility: visible;
    opacity: 1;
  }
  #nav ul {
    flex-direction: column;
    padding: 1rem;
    gap: 0.5rem;
  }
  #nav a {
    display: block;
    padding: 1rem;
    text-align: center;
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 12px;
  }
  .page-content {
    padding-top: 100px;
  }
  .credentials-title {
    font-size: 1.8rem;
    margin-bottom: 2rem;
  }
  .certificate-grid {
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
  }
  .certificate-image {
    height: 160px;
  }
  .certificate-name {
    font-size: 1rem;
  }
  .modal-content {
    width: 90%;
    padding: 15px;
  }
  .modal-content .certificate-title {
    font-size: 1.2rem;
  }
  .education-item {
    padding: 1.5rem 1.2rem;
  }
  .education-item h3 {
    font-size: 1.1rem;
  }
  .education-entry {
    border-left: 2px solid var(--glass-border);
  }
  .degree-title {
    font-size: 1rem;
  }
  .institution {
    font-size: 0.9rem;
  }
  .status, .graduation-date {
    font-size: 0.85rem;
  }
}

@media (max-width: 480px) {
  .credentials-title {
    font-size: 1.5rem;
  }
  .certificate-grid {
    grid-template-columns: 1fr; 
    gap: 1rem;
  }
  .certificate-image {
    height: 140px;
  }
  .certificate-name {
    font-size: 0.95rem;
  }
  .certificate-issuer {
    font-size: 0.8rem;
  }
  .modal-content .certificate-title {
    font-size: 1rem;
  }
  .close {
    font-size: 30px;
    right: 20px;
  }
  .education-item {
    padding: 1rem;
  }
  .education-item h3 {
    font-size: 1rem;
    gap: 0.5rem;
  }
  .education-item h3 i {
    font-size: 1.2rem;
  }
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 100px;
}

::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(to bottom, var(--primary-violet), var(--accent-violet));
  border-radius: 4px;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent-violet);
  outline-offset: 2px;
}