/* Base styles */
:root {
  --bg-color-light: #f0f0f5;
  --text-color-light: #222;
  --primary-color: #ff6f61;
  --bg-color-dark: #121212;
  --text-color-dark: #eee;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  padding: 0;
  background-color: var(--bg-color-light);
  color: var(--text-color-light);
  transition: background-color 0.3s, color 0.3s;
  scroll-behavior: smooth;
}

body.dark-mode {
  background-color: var(--bg-color-dark);
  color: var(--text-color-dark);
}

header {
  background: var(--primary-color);
  color: white;
  padding: 1.5rem 0;
  text-align: center;
  position: sticky;
  top: 0;
  z-index: 1000;
}

header h1 {
  margin: 0;
  font-size: 2.5rem;
  letter-spacing: 2px;
}

nav {
  margin-top: 0.5rem;
}

nav a {
  color: white;
  text-decoration: none;
  margin: 0 15px;
  font-weight: 600;
  font-size: 1.1rem;
  transition: opacity 0.3s;
}

nav a:hover {
  opacity: 0.7;
}

.container {
  max-width: 900px;
  margin: 3rem auto;
  padding: 0 20px;
}

section {
  margin-bottom: 60px;
}

h2 {
  font-size: 2rem;
  border-bottom: 3px solid var(--primary-color);
  padding-bottom: 0.3rem;
  margin-bottom: 1rem;
}

p {
  line-height: 1.6;
  font-size: 1.1rem;
}

/* Projects cards */
.projects {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.project-card {
  background-color: white;
  border-radius: 10px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
  padding: 20px;
  transition: transform 0.3s;
}

body.dark-mode .project-card {
  background-color: #1e1e1e;
  box-shadow: 0 4px 15px rgba(255,111,97,0.4);
}

.project-card:hover {
  transform: translateY(-8px);
}

.project-card h3 {
  margin-top: 0;
  color: var(--primary-color);
}

/* Contact button */
#contact button {
  background-color: var(--primary-color);
  color: white;
  border: none;
  padding: 12px 25px;
  font-size: 1rem;
  border-radius: 30px;
  cursor: pointer;
  transition: background-color 0.3s;
  margin-top: 10px;
}

#contact button:hover {
  background-color: #e85a4f;
}

/* Dark mode toggle */
.dark-toggle {
  position: fixed;
  top: 15px;
  right: 15px;
  background: var(--primary-color);
  border: none;
  color: white;
  padding: 10px 15px;
  border-radius: 25px;
  cursor: pointer;
  font-weight: bold;
  box-shadow: 0 4px 8px rgba(0,0,0,0.2);
  transition: background-color 0.3s;
  z-index: 1100;
}

.dark-toggle:hover {
  background-color: #e85a4f;
}

footer {
  text-align: center;
  padding: 15px 0;
  border-top: 1px solid #ddd;
  margin-top: 60px;
  font-size: 0.9rem;
  color: #666;
}

body.dark-mode footer {
  border-color: #444;
  color: #aaa;
}