:root {
  --bg-color: #0b1020;
  --bg-alt: #111832;
  --card-bg: #151d38;
  --text-color: #e6e9f5;
  --muted-text: #a9b1c9;
  --accent: #6c5ce7;
  --accent-light: #8e7bff;
  --blue: #38bdf8;
  --border-color: rgba(255, 255, 255, 0.10);
  --radius: 16px;
  --transition: 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Segoe UI", Arial, sans-serif;
  background:
    radial-gradient(circle at top left, rgba(108, 92, 231, 0.22), transparent 35%),
    radial-gradient(circle at bottom right, rgba(56, 189, 248, 0.16), transparent 38%),
    var(--bg-color);
  color: var(--text-color);
  line-height: 1.7;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(11, 16, 32, 0.88);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
}

.navbar {
  max-width: 1100px;
  margin: auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.logo {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--text-color);
  text-decoration: none;
  padding: 8px 14px;
  border: 2px solid var(--accent);
  border-radius: 10px;
  transition: var(--transition);
}

.logo:hover {
  background: var(--accent);
  box-shadow: 0 0 20px rgba(108, 92, 231, 0.55);
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
}

.nav-links a {
  display: block;
  padding: 8px 14px;
  color: var(--muted-text);
  text-decoration: none;
  border-radius: 8px;
  font-size: 0.95rem;
  transition: var(--transition);
}

.nav-links a:hover,
.nav-links a:focus {
  color: #ffffff;
  background: rgba(108, 92, 231, 0.22);
}
.hero {
  min-height: calc(100vh - 72px);
  max-width: 1100px;
  margin: auto;
  padding: 80px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 48px;
}

.hero-content {
  max-width: 620px;
  animation: fadeIn 1s ease both;
}

.hero-greeting {
  color: var(--blue);
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  font-size: 0.85rem;
}

.hero h1 {
  margin: 14px 0;
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  line-height: 1.15;
  background: linear-gradient(90deg, #ffffff, var(--accent-light), var(--blue));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-description {
  font-size: 1.1rem;
  color: var(--muted-text);
  margin-bottom: 30px;
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.btn {
  display: inline-block;
  padding: 13px 26px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 600;
  transition: var(--transition);
}

.btn-primary {
  color: #ffffff;
  background: linear-gradient(135deg, var(--accent), var(--blue));
  box-shadow: 0 8px 24px rgba(108, 92, 231, 0.35);
}

.btn-primary:hover,
.btn-primary:focus {
  transform: translateY(-3px);
  box-shadow: 0 12px 30px rgba(56, 189, 248, 0.35);
}

.btn-outline {
  color: var(--text-color);
  border: 1px solid rgba(255, 255, 255, 0.25);
}

.btn-outline:hover,
.btn-outline:focus {
  border-color: var(--accent-light);
  background: rgba(108, 92, 231, 0.18);
  transform: translateY(-3px);
}

.profile-image {
  width: 280px;
  height: 280px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  color: var(--muted-text);
  font-weight: 600;
  background:
    linear-gradient(145deg, rgba(108, 92, 231, 0.35), rgba(56, 189, 248, 0.22)),
    var(--card-bg);
  border: 3px solid rgba(142, 123, 255, 0.5);
  box-shadow: 0 0 45px rgba(108, 92, 231, 0.25);
  animation: float 5s ease-in-out infinite;
}

.section {
  max-width: 1100px;
  margin: auto;
  padding: 90px 24px;
}

.section-alt {
  background: rgba(17, 24, 50, 0.55);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  max-width: none;
}

.section-alt > * {
  max-width: 1100px;
  margin-left: auto;
  margin-right: auto;
}

.section-header {
  text-align: center;
  margin-bottom: 45px;
}

.section-header h2 {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  margin-bottom: 10px;
}

.section-header p {
  color: var(--muted-text);
  max-width: 650px;
  margin: auto;
}

.about-card {
  max-width: 850px;
  margin: auto;
  padding: 34px;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  box-shadow: 0 18px 45px rgba(0, 0, 0, 0.25);
}

.about-card p + p {
  margin-top: 18px;
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 22px;
}

.skill-card {
  padding: 28px;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  text-align: center;
  transition: var(--transition);
}

.skill-card:hover {
  transform: translateY(-6px);
  border-color: rgba(142, 123, 255, 0.55);
  box-shadow: 0 16px 35px rgba(108, 92, 231, 0.18);
}

.skill-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 58px;
  height: 58px;
  margin-bottom: 16px;
  border-radius: 16px;
  font-weight: 700;
  color: #ffffff;
  background: linear-gradient(135deg, var(--accent), var(--blue));
}

.skill-card h3 {
  margin-bottom: 8px;
}

.skill-card p {
  color: var(--muted-text);
  font-size: 0.95rem;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.project-card {
  overflow: hidden;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  transition: var(--transition);
}

.project-card:hover {
  transform: translateY(-6px);
  border-color: rgba(56, 189, 248, 0.55);
  box-shadow: 0 18px 40px rgba(56, 189, 248, 0.15);
}

.project-preview {
  height: 150px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #ffffff;
  background: linear-gradient(135deg, rgba(108, 92, 231, 0.75), rgba(56, 189, 248, 0.55));
}

.project-details {
  padding: 24px;
}

.project-details h3 {
  margin-bottom: 10px;
}

.project-details p {
  color: var(--muted-text);
  font-size: 0.95rem;
}

.project-tech {
  margin: 14px 0 18px;
  font-size: 0.85rem !important;
  color: var(--blue) !important;
}

.project-link {
  display: inline-block;
  color: var(--accent-light);
  text-decoration: none;
  font-weight: 600;
  border-bottom: 2px solid transparent;
  transition: var(--transition);
}

.project-link:hover,
.project-link:focus {
  color: var(--blue);
  border-bottom-color: var(--blue);
}

.certification-card {
  display: flex;
  align-items: center;
  gap: 30px;
  padding: 30px;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
}

.certification-info h3 {
  margin-bottom: 6px;
}

.certification-title {
  color: var(--blue);
  font-weight: 600;
  margin-bottom: 14px;
}

.certification-info p:last-child {
  color: var(--muted-text);
}

.certificate-placeholder {
  width: 220px;
  height: 160px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted-text);
  font-size: 0.9rem;
  border: 2px dashed rgba(142, 123, 255, 0.45);
  border-radius: 12px;
  background: rgba(108, 92, 231, 0.10);
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 20px;
}

.contact-card {
  padding: 26px;
  text-align: center;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  transition: var(--transition);
}

.contact-card:hover {
  transform: translateY(-5px);
  border-color: rgba(108, 92, 231, 0.55);
}

.contact-card h3 {
  margin-bottom: 10px;
}

.contact-card a {
  color: var(--accent-light);
  text-decoration: none;
  word-break: break-word;
  transition: var(--transition);
}

.contact-card a:hover,
.contact-card a:focus {
  color: var(--blue);
  text-decoration: underline;
}

.site-footer {
  padding: 28px 24px;
  text-align: center;
  border-top: 1px solid var(--border-color);
  background: rgba(11, 16, 32, 0.85);
}

.site-footer p {
  color: var(--muted-text);
  margin-bottom: 10px;
}

.back-to-top {
  color: var(--accent-light);
  text-decoration: none;
  font-weight: 600;
  transition: var(--transition);
}

.back-to-top:hover {
  color: var(--blue);
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-12px);
  }
}

@media (max-width: 900px) {
  .hero {
    flex-direction: column;
    text-align: center;
    padding-top: 60px;
  }

  .hero-content {
    max-width: 100%;
  }

  .hero-buttons {
    justify-content: center;
  }

  .profile-image {
    width: 220px;
    height: 220px;
  }

  .certification-card {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 650px) {
  .navbar {
    flex-direction: column;
  }

  .nav-links {
    justify-content: center;
  }

  .section {
    padding: 65px 20px;
  }

  .about-card,
  .certification-card {
    padding: 24px;
  }

  .certificate-placeholder {
    width: 100%;
  }
}