/* Color Definitions (Default Dark Theme) */
:root {
  --bg-color: #0d1117;
  --text-color: #c9d1d9;
  --card-bg: #161b22;
  --border-color: #30363d;
  --highlight: #58a6ff; /* Blue */
  --accent: #238636; /* Green */
}

/* Light Theme (Activated via JS) */
body.light-mode {
  --bg-color: #f4f4f9;
  --text-color: #333333;
  --card-bg: #ffffff;
  --border-color: #ddd;
  --highlight: #0056b3;
  --accent: #198754;
}

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

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  transition: background-color 0.3s, color 0.3s; /* Smooth transition */
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
header {
  padding: 20px 0;
  border-bottom: 1px solid var(--border-color);
}
nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.logo {
  font-weight: bold;
  font-size: 1.2rem;
  color: var(--highlight);
}

.links {
  display: flex;
  align-items: center;
  gap: 20px;
}
.links a {
  color: var(--text-color);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.3s;
}
.links a:hover {
  color: var(--highlight);
}

/* Theme Toggle Button */
#theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-color);
  font-size: 1.2rem;
  padding: 5px;
  transition: transform 0.2s;
}
#theme-toggle:hover {
  transform: scale(1.1);
  color: var(--highlight);
}

/* Hero Section */
.hero {
  padding: 80px 0;
  text-align: center;
}
h1 {
  font-size: 3rem;
  color: var(--text-color);
  margin-bottom: 10px;
}
.highlight {
  color: var(--highlight);
}
.subtitle {
  font-size: 1.5rem;
  color: #8b949e;
  margin-bottom: 20px;
}
.bio {
  max-width: 600px;
  margin: 0 auto 30px auto;
  font-size: 1.1rem;
}

/* Tech Stack */
.tech-stack span {
  display: inline-block;
  background: var(--card-bg);
  padding: 8px 15px;
  border-radius: 50px;
  margin: 5px;
  border: 1px solid var(--border-color);
  font-size: 0.9rem;
}

/* Projects Section */
.projects {
  padding: 50px 0;
}
h2 {
  margin-bottom: 30px;
  border-left: 4px solid var(--accent);
  padding-left: 15px;
  color: var(--text-color);
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  padding: 20px;
  border-radius: 8px;
  transition: transform 0.2s;
}
.card:hover {
  transform: translateY(-5px);
  border-color: var(--highlight);
}
.card h3 {
  color: var(--text-color);
  margin-bottom: 10px;
}
.card p {
  font-size: 0.9rem;
  color: #8b949e;
  margin-bottom: 15px;
}

.tags .tag {
  font-size: 0.75rem;
  color: var(--highlight);
  background: rgba(88, 166, 255, 0.1);
  padding: 2px 8px;
  border-radius: 4px;
  margin-right: 5px;
}

/* Buttons */
.btn {
  display: inline-block;
  margin-top: 15px;
  text-decoration: none;
  color: var(--text-color);
  font-weight: bold;
}
.btn:hover {
  text-decoration: underline;
  color: var(--highlight);
}
.secondary {
  color: #8b949e;
  cursor: default;
}
.secondary:hover {
  text-decoration: none;
  color: #8b949e;
}

/* Footer */
footer {
  text-align: center;
  padding: 40px 0;
  color: #8b949e;
  font-size: 0.8rem;
  border-top: 1px solid var(--border-color);
  margin-top: 40px;
}