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

:root {
  --color-bg: #ffffff;
  --color-text: #1a1a1a;
  --color-muted: #626262;
  --color-border: #e5e5e5;
  --color-accent: #0052cc;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --max-width: 640px;
}

[data-theme="dark"] {
  --color-bg: #191919;
  --color-text: #ebebeb;
  --color-muted: #9b9b9b;
  --color-border: #3a3a3a;
  --color-accent: #5bb1ff;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  transition: background-color 0.3s ease, color 0.3s ease;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s, color 0.2s;
}

a:hover {
  border-bottom: 1px solid var(--color-accent);
}

.header {
  border-bottom: 1px solid var(--color-border);
  padding: 2rem 0;
  transition: border-color 0.3s ease;
}

.nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand a {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  border-bottom: none;
  transition: color 0.2s;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav-links a {
  font-size: 0.9rem;
  color: var(--color-muted);
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--color-text);
  border-bottom: 1px solid var(--color-accent);
}

.nav-resume {
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--color-accent);
  border-radius: 4px;
  color: var(--color-accent) !important;
  transition: all 0.2s ease;
  font-size: 0.85rem;
}

.nav-resume:hover {
  background: var(--color-accent);
  color: var(--color-bg) !important;
  border-bottom: 1px solid var(--color-accent);
}

.theme-toggle {
  background: none;
  border: 1px solid var(--color-border);
  color: var(--color-muted);
  cursor: pointer;
  padding: 0.4rem 0.8rem;
  border-radius: 4px;
  font-size: 0.85rem;
  transition: all 0.2s ease;
}

.theme-toggle:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.container {
  max-width: var(--max-width);
  margin: 4rem auto;
  padding: 0 1rem;
  min-height: calc(100vh - 300px);
}

h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  font-weight: 700;
  letter-spacing: -0.5px;
}

h2 {
  font-size: 1.4rem;
  margin-top: 2rem;
  margin-bottom: 1rem;
  font-weight: 700;
  letter-spacing: -0.3px;
}

h3 {
  font-size: 1.1rem;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
  font-weight: 700;
  letter-spacing: -0.3px;
}

p {
  margin-bottom: 1rem;
  color: var(--color-text);
}

hr {
  border: 0;
  border-top: 1px solid var(--color-border);
  margin: 2.5rem 0;
  transition: border-color 0.3s ease;
}

.subtitle {
  color: var(--color-muted);
  font-size: 0.95rem;
  margin-bottom: 2rem;
}

.tagline {
  font-size: 1.3rem;
  line-height: 1.8;
  margin-bottom: 1rem;
  color: var(--color-text);
  font-weight: 500;
  letter-spacing: -0.3px;
}

.tagline strong {
  color: var(--color-accent);
  font-weight: 700;
  transition: color 0.2s;
}

.resume-section {
  padding: 1.5rem;
  background: var(--color-border);
  border-radius: 6px;
  margin: 1.5rem 0 2rem 0;
  border-left: 3px solid var(--color-accent);
  transition: all 0.2s ease;
}

.resume-section a {
  display: inline-block;
  padding: 0.5rem 1rem;
  background: var(--color-accent);
  color: var(--color-bg);
  border-radius: 4px;
  margin-bottom: 0.5rem;
  transition: all 0.2s ease;
  border-bottom: none;
}

.resume-section a:hover {
  opacity: 0.9;
  text-decoration: none;
}

.resume-viewer {
  margin: 2rem 0;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  overflow: hidden;
  background: var(--color-bg);
}

.resume-download {
  text-align: center;
  margin: 2rem 0;
}

.download-btn {
  display: inline-block;
  padding: 0.8rem 1.5rem;
  background: var(--color-accent);
  color: var(--color-bg);
  border-radius: 6px;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s ease;
  border-bottom: none;
}

.download-btn:hover {
  opacity: 0.9;
  transform: translateY(-2px);
  border-bottom: none;
}

.projects {
  display: grid;
  gap: 3rem;
  margin-top: 2rem;
}

.project-link {
  display: block;
  position: relative;
  text-decoration: none;
  color: inherit;
  border-bottom: none;
  transition: all 0.2s ease;
}

.project-link:hover {
  border-bottom: none;
}

.project {
  padding: 1.5rem;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  transition: all 0.2s ease;
  cursor: pointer;
}

.project-link:hover .project {
  border-color: var(--color-accent);
  background: var(--color-bg);
}

.project:hover {
  border-color: var(--color-accent);
}

.project-header {
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: 1rem;
}

.project h3 {
  margin-top: 0;
  font-size: 1.2rem;
  margin-bottom: 0;
}

.project-links {
  display: flex;
  gap: 0.5rem;
  flex-shrink: 0;
  position: relative;
  z-index: 1; /* sits above the card overlay so GitHub icon is independently clickable */
}

.project-link-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 4px;
  background: var(--color-border);
  color: var(--color-accent);
  font-weight: 700;
  font-size: 0.9rem;
  border-bottom: none;
  transition: all 0.2s ease;
}

.project-link-icon:hover {
  background: var(--color-accent);
  color: var(--color-bg);
  border-bottom: none;
}

.project-desc {
  color: var(--color-muted);
  font-size: 0.9rem;
  margin: 0.5rem 0 1rem 0;
}

.tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.tech-tag {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: var(--color-border);
  border-radius: 4px;
  font-size: 0.8rem;
  color: var(--color-muted);
  transition: all 0.2s;
}

.tech-tag:hover {
  background: var(--color-accent);
  color: var(--color-bg);
}

.skills {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  margin: 2rem 0;
}

.skill-group h3 {
  margin-top: 0;
  font-size: 0.95rem;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 1rem;
  font-weight: 600;
}

.skill-group ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.skill-group li {
  font-size: 0.9rem;
}

.footer {
  border-top: 1px solid var(--color-border);
  margin-top: 4rem;
  padding: 2rem;
  text-align: center;
  color: var(--color-muted);
  font-size: 0.85rem;
  transition: border-color 0.3s ease;
}

.footer a {
  color: var(--color-muted);
  transition: color 0.2s;
}

.footer a:hover {
  color: var(--color-accent);
}

@media (max-width: 600px) {
  h1 { font-size: 1.6rem; }
  h2 { font-size: 1.2rem; }

  .nav {
    flex-direction: column;
    gap: 1rem;
  }

  .nav-links {
    gap: 1rem;
  }

  .container {
    margin: 2rem auto;
  }
}