:root {
  --bg-primary: #ffffff;
  --bg-primary-rgb: 255, 255, 255;
  --bg-secondary: #f8fafc;
  --surface: #ffffff;
  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --accent-primary: #3b82f6;
  --accent-gradient: linear-gradient(135deg, #2563eb, #7c3aed);
  --accent-soft: #eef2ff;
  --border-light: #e2e8f0;
  --card-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.02);
  --hover-shadow: 0 20px 30px -12px rgba(0, 0, 0, 0.1);
  --transition-smooth: all 0.25s cubic-bezier(0.2, 0.9, 0.4, 1.1);
  --radius-card: 1.25rem;
  --radius-element: 0.75rem;
}

body.dark-mode {
  --bg-primary: #0b1120;
  --bg-primary-rgb: 11, 17, 32;
  --bg-secondary: #0f172a;
  --surface: #111827;
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --accent-primary: #60a5fa;
  --accent-gradient: linear-gradient(135deg, #3b82f6, #8b5cf6);
  --accent-soft: #1e293b;
  --border-light: #1e293b;
  --card-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3);
}

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

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: 'Inter', sans-serif;
  line-height: 1.5;
  transition: background-color 0.3s ease, color 0.2s ease;
  scroll-behavior: smooth;
}

body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at 20% 30%, rgba(59,130,246,0.03) 0%, rgba(124,58,237,0.02) 100%);
  pointer-events: none;
  z-index: -1;
}

.cv-container {
  max-width: 980px;
  margin: 2rem auto;
  padding: 0 2rem;
}

.cv-header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 2rem;
  margin-bottom: 3.5rem;
  padding-bottom: 2rem;
  border-bottom: 2px solid var(--border-light);
  position: relative;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 1.8rem;
  flex-wrap: wrap;
}

.profile-img {
  width: 112px;
  height: 112px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--accent-primary);
  box-shadow: 0 12px 24px -8px rgba(59,130,246,0.25);
  transition: var(--transition-smooth);
  background: var(--accent-soft);
}

.profile-img:hover {
  transform: scale(1.02);
  border-color: #8b5cf6;
  box-shadow: 0 20px 30px -12px rgba(59,130,246,0.4);
}

.header-content {
  flex: 1;
}

.name {
  font-family: 'Space Grotesk', monospace;
  font-size: 2.8rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: var(--accent-gradient);
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;
  display: inline-block;
  margin-bottom: 0.5rem;
}

.role {
  font-size: 1rem;
  font-weight: 500;
  color: var(--accent-primary);
  background: var(--accent-soft);
  display: inline-block;
  padding: 0.2rem 0.9rem;
  border-radius: 40px;
  backdrop-filter: blur(4px);
  letter-spacing: 0.3px;
}

.social-links {
  margin-top: 0.75rem;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.social-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: var(--transition-smooth);
  padding: 0.25rem 0;
  border-bottom: 1px solid transparent;
}

.social-links a i {
  font-size: 0.9rem;
  color: var(--accent-primary);
  transition: 0.3s;
}

.social-links a:hover {
  color: var(--accent-primary);
  border-bottom-color: var(--accent-primary);
  transform: translateY(-2px) scale(1.1);
}

.contact-info {
  text-align: right;
  background: var(--bg-secondary);
  padding: 0.8rem 1.4rem;
  border-radius: var(--radius-element);
  backdrop-filter: blur(2px);
  border: 1px solid var(--border-light);
}

.contact-info p {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  justify-content: flex-end;
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin: 0.3rem 0;
}

.contact-info i {
  width: 1.2rem;
  color: var(--accent-primary);
}

.cv-section {
  margin-bottom: 3.8rem;
}

.section-title {
  font-family: 'Space Grotesk', monospace;
  font-size: 1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-primary);
  margin-bottom: 1.5rem;
  display: inline-block;
  background: var(--accent-soft);
  padding: 0.2rem 1rem;
  border-radius: 30px;
}

.experience-item, .project-item {
  background: var(--surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-card);
  padding: 1.5rem;
  margin-bottom: 1.6rem;
  transition: var(--transition-smooth);
  box-shadow: var(--card-shadow);
}

.experience-item:hover, .project-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--hover-shadow);
  border-color: var(--accent-primary);
}

.item-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.item-title {
  font-size: 1.35rem;
  font-weight: 700;
  font-family: 'Space Grotesk', monospace;
  color: var(--text-primary);
}

.item-title a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition-smooth);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.item-title a i {
  font-size: 1rem;
  opacity: 0.7;
}

.item-title a:hover {
  color: var(--accent-primary);
}

.item-date {
  font-size: 0.8rem;
  font-weight: 500;
  background: var(--accent-soft);
  padding: 0.2rem 0.7rem;
  border-radius: 40px;
  color: var(--accent-primary);
}

.item-org {
  font-weight: 600;
  color: var(--text-secondary);
  margin: 0.3rem 0 0.7rem 0;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.item-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

.tech-tags {
  margin-top: 0.8rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tech-tags span {
  background: var(--accent-soft);
  padding: 0.2rem 0.8rem;
  border-radius: 20px;
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--text-primary);
}

.inline-sections {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-top: 1rem;
}

.sub-section {
  background: var(--surface);
  border-radius: var(--radius-card);
  padding: 1.5rem 1.8rem;
  border: 1px solid var(--border-light);
  transition: var(--transition-smooth);
  box-shadow: var(--card-shadow);
}

.sub-section:hover {
  transform: translateY(-3px);
  border-color: var(--accent-primary);
}

.skills-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 0.8rem;
}

.skills-list li {
  background: var(--accent-soft);
  padding: 0.4rem 1rem;
  border-radius: 40px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-primary);
  transition: 0.2s;
  backdrop-filter: blur(2px);
}

.skills-list li::before {
  content: "▹";
  margin-right: 6px;
  color: var(--accent-primary);
  font-size: 0.75rem;
}

.education-item .item-title {
  font-size: 1.2rem;
  margin-bottom: 0.25rem;
}

.achievements-interests {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: space-between;
}

.info-card {
  background: var(--surface);
  border-radius: var(--radius-card);
  padding: 1.2rem 1.5rem;
  border: 1px solid var(--border-light);
  flex: 1;
  transition: var(--transition-smooth);
}

.info-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent-primary);
}

.info-card h3 {
  font-family: 'Space Grotesk', monospace;
  font-size: 1rem;
  margin-bottom: 0.6rem;
  color: var(--accent-primary);
}

.info-card p {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.5;
}

.cv-footer {
  border-top: 1px solid var(--border-light);
  padding-top: 2rem;
  margin-top: 3rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.theme-btn {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: var(--surface);
  border: 1px solid var(--border-light);
  color: var(--text-primary);
  padding: 0.8rem 1.5rem;
  font-weight: 600;
  font-size: 0.85rem;
  border-radius: 60px;
  cursor: pointer;
  backdrop-filter: blur(12px);
  background-color: rgba(var(--bg-primary-rgb, 255, 255, 255), 0.8);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
  transition: all 0.3s ease;
  z-index: 1000;
  font-family: 'Inter', sans-serif;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

body.dark-mode .theme-btn {
  background: #1e293bcc;
  backdrop-filter: blur(12px);
}

.theme-btn:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 15px 30px -10px rgba(0, 0, 0, 0.2);
  border-color: var(--accent-primary);
}

.theme-btn i {
  font-size: 1rem;
}

@media (max-width: 780px) {
  .cv-container {
    padding: 0 1.2rem;
  }
  .cv-header {
    flex-direction: column;
    align-items: flex-start;
  }
  .contact-info {
    text-align: left;
    width: 100%;
  }
  .contact-info p {
    justify-content: flex-start;
  }
  .name {
    font-size: 2.2rem;
  }
  .inline-sections {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  .item-header {
    flex-direction: column;
  }
  .item-date {
    align-self: flex-start;
  }
  .profile-img {
    width: 88px;
    height: 88px;
  }
  .achievements-interests {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .header-left {
    flex-direction: column;
    align-items: flex-start;
  }
  .cv-footer {
    flex-direction: column;
    text-align: center;
  }
}

a {
  text-decoration: none;
}

.project-item .item-title a {
  position: relative;
}

.project-item .item-title a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-primary);
  transition: width 0.2s ease;
}

.project-item .item-title a:hover::after {
  width: 100%;
}