:root {
  --bg: #f7f8fa;
  --text: #1a1a1a;
  --accent: #0077cc;
  --accent-gradient: linear-gradient(90deg, #0077cc 0%, #00c6ff 100%);
  --card-bg: rgba(255, 255, 255, 0.92);
  --glass-blur: 12px;
  --card-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.10);
  --border-radius: 18px;
  --transition: 0.3s cubic-bezier(.4,2,.3,1);
}

body.dark {
  --bg: #181a23;
  --text: #f0f0f0;
  --accent: #ffa500;
  --accent-gradient: linear-gradient(90deg, #ffa500 0%, #ff5e62 100%);
  --card-bg: rgba(34, 36, 48, 0.92);
  --glass-blur: 16px;
  --card-shadow: 0 8px 32px 0 rgba(0,0,0,0.25);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', sans-serif;
  margin: 0;
  background: var(--bg);
  color: var(--text);
  transition: background var(--transition), color var(--transition);
  min-height: 100vh;
}

.theme-toggle-container {
  position: fixed;
  top: 16px;
  right: 24px;
  z-index: 1000;
}

#themeToggle {
  background: var(--accent-gradient);
  color: #fff;
  border: none;
  border-radius: 50%;
  width: 38px;
  height: 38px;
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0,0,0,0.10);
  transition: background var(--transition), transform var(--transition);
}
#themeToggle:hover {
  transform: scale(1.1) rotate(-10deg);
}

.header-top {
  text-align: center;
  padding: 48px 0 24px 0;
  background: var(--accent-gradient);
  color: #fff;
  position: relative;
}
.profile-img {
  width: 110px;
  height: 110px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid #fff;
  box-shadow: 0 4px 24px rgba(0,0,0,0.10);
  margin-bottom: 14px;
  background: #fff;
}
.header-top h1 {
  font-size: 2.2rem;
  margin: 0 0 10px 0;
  font-weight: 700;
  letter-spacing: 1px;
}
.top-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
  margin-top: 12px;
}
.btn {
  display: inline-block;
  background: var(--card-bg);
  color: var(--accent);
  font-weight: 600;
  padding: 8px 18px;
  border-radius: 8px;
  text-decoration: none;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  transition: background var(--transition), color var(--transition), transform var(--transition);
  border: 2px solid transparent;
}
.btn:hover, .btn:focus {
  background: var(--accent-gradient);
  color: #fff;
  transform: translateY(-2px) scale(1.05);
  border: 2px solid #fff;
  outline: none;
}

main {
  max-width: 700px;
  margin: 0 auto;
  padding: 0 16px;
}

.section-nav {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin: 32px 0 0 0;
  flex-wrap: wrap;
}
.section-btn {
  background: var(--card-bg);
  color: var(--accent);
  border: 2px solid var(--accent);
  border-radius: 8px 8px 0 0;
  padding: 10px 18px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  margin-bottom: -2px;
  transition: background var(--transition), color var(--transition), border var(--transition);
  outline: none;
}
.section-btn.active,
.section-btn:focus {
  background: var(--accent-gradient);
  color: #fff;
  border-bottom: 2px solid var(--bg);
  z-index: 2;
}
.section-btn:hover:not(.active) {
  background: #e0eaff;
  color: var(--accent);
}

.section-content {
  background: none;
  margin-top: 0;
  min-height: 320px;
  padding-bottom: 32px;
}
.section-panel {
  display: none;
  flex-direction: column;
  gap: 18px;
  animation: fadeIn 0.5s;
}
.section-panel[style*="display:block"] {
  display: flex;
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px);}
  to { opacity: 1; transform: translateY(0);}
}

h2 {
  font-size: 1.5rem;
  color: var(--accent);
  margin-bottom: 18px;
  font-weight: 700;
  letter-spacing: 0.5px;
  border-bottom: 2px solid #e0e0e0;
  padding-bottom: 6px;
}
.card {
  background: var(--card-bg);
  border-radius: var(--border-radius);
  box-shadow: var(--card-shadow);
  padding: 24px 20px;
  margin-bottom: 0;
  transition: box-shadow var(--transition), background var(--transition);
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.card:hover {
  box-shadow: 0 12px 36px 0 rgba(31, 38, 135, 0.18);
}
.education-block,
.internship-block,
.certification-block {
  margin-bottom: 18px;
}
.education-date,
.internship-date,
.certification-date {
  float: right;
  font-weight: 500;
  font-style: italic;
  color: var(--accent);
  font-size: 0.98em;
}
.education-desc,
.internship-desc,
.certification-desc,
.education-grade {
  margin: 4px 0 0 0;
  font-size: 1.01em;
  opacity: 0.92;
}
.skills-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  list-style: none;
  padding: 0;
  margin: 0;
}
ul {
  padding-left: 20px;
  margin: 0;
}
li {
  margin-bottom: 10px;
  font-size: 1.05rem;
}

footer {
  text-align: center;
  padding: 24px 0 16px 0;
  font-size: 1rem;
  background: #f0f0f0;
  color: #666;
  margin-top: 32px;
  border-top: 1px solid #e0e0e0;
  transition: background var(--transition), color var(--transition);
}
body.dark footer {
  background: #23243a;
  color: #aaa;
  border-top: 1px solid #333;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover, a:focus {
  color: #005fa3;
  outline: none;
}
body.dark a:hover, body.dark a:focus {
  color: #ffa500;
}

::-webkit-scrollbar {
  width: 8px;
  background: #e0e0e0;
}
::-webkit-scrollbar-thumb {
  background: var(--accent);
  border-radius: 8px;
}

@media (max-width: 800px) {
  .header-top {
    padding: 32px 0 16px 0;
  }
  .profile-img {
    width: 80px;
    height: 80px;
  }
  .header-top h1 {
    font-size: 1.3rem;
  }
  main {
    padding: 0 4px;
  }
  .section-btn {
    font-size: 0.95rem;
    padding: 8px 10px;
  }
  .card {
    padding: 12px 6px;
  }
  h2 {
    font-size: 1.1rem;
  }
}