:root {
  --bg-color: #0f172a;
  --card-bg: #1e293b;
  --accent: #38bdf8;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --border: #334155;
}

:root.light-mode {
  --bg-color: #f1f5f9;
  --card-bg: #ffffff;
  --accent: #0ea5e9;
  --text-main: #0f172a;
  --text-muted: #475569;
  --border: #cbd5e1;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.6;
}

header {
  position: sticky;
  top: 0;
  background: rgba(15, 23, 42, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
}

:root.light-mode header {
  background: rgba(241, 245, 249, 0.9);
}

nav {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
}

.logo {
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--accent);
}

nav ul {
  display: flex;
  list-style: none;
  gap: 1.5rem;
}

nav a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s;
}

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

section {
  max-width: 1100px;
  margin: 0 auto;
  padding: 4rem 2rem;
}

.hero {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6rem 2rem 4rem;
  gap: 2rem;
}

.hero-content {
  flex: 1;
}

.hero h1 {
  font-size: 2.8rem;
  margin-bottom: 0.5rem;
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-muted);
}

.hero-image {
  flex-shrink: 0;
}

.hero-image img {
  width: 250px;
  height: 250px;
  object-fit: cover;
  border-radius: none;
  border: 4px solid var(--accent);
}

.highlight {
  color: var(--accent);
}

h2 {
  font-size: 1.8rem;
  margin-bottom: 1.5rem;
  border-bottom: 2px solid var(--border);
  padding-bottom: 0.5rem;
}

#skills {
  background: var(--card-bg);
  border-radius: 16px;
  padding: 2.5rem 2rem;
  margin: 0 auto;
  max-width: 700px;
  border: 1px solid var(--border);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.15);
}

#skills h2 {
  text-align: center;
  border-bottom: none;
  margin-bottom: 2rem;
  font-size: 1.6rem;
}

.skills-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.skill-item {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.skill-icon {
  font-size: 1.5rem;
  width: 40px;
  text-align: center;
  flex-shrink: 0;
}

.skill-label {
  font-weight: 600;
  font-size: 0.95rem;
  min-width: 120px;
  color: var(--text-main);
}

.skill-bar {
  flex: 1;
  height: 10px;
  background: var(--bg-color);
  border-radius: 999px;
  overflow: hidden;
  border: 1px solid var(--border);
}

.skill-fill {
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), #7dd3fc);
  transition: width 1s ease;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.project-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.project-card h3 {
  margin-bottom: 0.5rem;
}

.project-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

.tag-container {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.tag {
  background: rgba(56, 189, 248, 0.1);
  color: var(--accent);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  font-size: 0.8rem;
}

.contact-container {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2.5rem;
  max-width: 900px;
  margin: 0 auto;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.contact-info h3 {
  font-size: 1.4rem;
  margin-bottom: 0.5rem;
  color: var(--accent);
}

.contact-info p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1rem;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  color: var(--text-main);
  font-size: 0.95rem;
}

.contact-item span {
  font-size: 1.2rem;
}

#contact h2 {
  text-align: center;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

#contact {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-main);
  padding: 0.4rem 0.8rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: opacity 0.2s;
}

.theme-toggle:hover {
  opacity: 0.8;
}

footer {
  text-align: center;
  padding: 2rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  font-size: 0.9rem;
}