:root {
  --bg-color: #0f0f0f;
  --text-color: #ffffff;
  --accent-color: #00eaff;
  --card-bg: rgba(255, 255, 255, 0.05);
}

body.light-theme {
  --bg-color: #f9f9f9;
  --text-color: #0f0f0f;
  --accent-color: #0077ff;
  --card-bg: rgba(0, 0, 0, 0.05);
}

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

body {
  font-family: 'Segoe UI', sans-serif;
  background: var(--bg-color);
  color: var(--text-color);
  transition: background 0.3s ease, color 0.3s ease;
}

header {
  position: fixed;
  top: 0;
  width: 100%;
  background: var(--bg-color);
  padding: 20px 50px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 1000;
  backdrop-filter: blur(10px);
}

.logo {
  font-size: 2rem;
  font-weight: bold;
  color: var(--accent-color);
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 25px;
  align-items: center;
}

.nav-links li a,
.toggle-theme {
  text-decoration: none;
  color: var(--text-color);
  font-size: 1.1rem;
  background: none;
  border: none;
  cursor: pointer;
  transition: color 0.3s;
}

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

section {
  padding: 120px 50px;
  min-height: 100vh;
  text-align: center;
}

h1, h2 {
  font-size: 2.5rem;
  margin-bottom: 20px;
}

h3 {
  font-size: 1.6rem;
  margin: 10px 0;
}

.home {
  background: url('https://images.unsplash.com/photo-1522199710521-72d69614c702') no-repeat center center/cover;
  display: flex;
  align-items: center;
  justify-content: center;
}

.home-content {
  background: rgba(0,0,0,0.6);
  padding: 40px;
  border-radius: 15px;
}

.home-content h1 span {
  color: var(--accent-color);
}

.typing {
  font-size: 1.5rem;
  color: var(--accent-color);
}

.btn {
  display: inline-block;
  margin-top: 20px;
  padding: 10px 25px;
  background: var(--accent-color);
  color: #fff;
  border-radius: 25px;
  text-decoration: none;
  transition: 0.3s;
}
.btn:hover {
  opacity: 0.8;
}

.about p {
  font-size: 1.2rem;
  max-width: 800px;
  margin: 0 auto;
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.skill-card {
  background: var(--card-bg);
  padding: 20px;
  border-radius: 12px;
  backdrop-filter: blur(10px);
  transition: transform 0.3s;
}
.skill-card:hover {
  transform: translateY(-5px);
}

.projects .project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 25px;
}

.project-card {
  background: var(--card-bg);
  padding: 25px;
  border-radius: 12px;
  transition: transform 0.3s, box-shadow 0.3s;
}
.project-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 8px 25px rgba(0,0,0,0.2);
  -webkit-transform: translateY(-8px);
  -moz-transform: translateY(-8px);
  -ms-transform: translateY(-8px);
  -o-transform: translateY(-8px);
}

.contact p {
  font-size: 1.1rem;
  margin: 10px 0;
}

footer {
  background: #000;
  text-align: center;
  padding: 20px;
}
footer p {
  color: var(--text-color);
  font-size: 0.9rem;
}