:root {
  --primary: #4f46e5;
  --bg: #f9fafb;
  --text: #111827;
  --card: #ffffff;
}

body.dark {
  --bg: #111827;
  --text: #f9fafb;
  --card: #1f2933;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Segoe UI", sans-serif;
}

body {
  background: var(--bg);
  color: var(--text);
  transition: 0.3s;
}

/* NAVBAR */
.navbar {
  position: sticky;
  top: 0;
  background: var(--card);
  display: flex;
  justify-content: space-between;
  padding: 1rem 2rem;
  align-items: center;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
  z-index: 10;
}

.navbar nav a {
  margin: 0 10px;
  text-decoration: none;
  color: var(--text);
  font-weight: 500;
}

/* HERO */
.hero {
  padding: 4rem 2rem;
  text-align: center;
  background: linear-gradient(135deg, #6366f1, #3b82f6);
  color: #fff;
}

.hero-buttons button {
  margin: 10px;
  padding: 10px 20px;
  border-radius: 8px;
  border: none;
  cursor: pointer;
}

/* PROJECTS */
.projects {
  padding: 3rem 2rem;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

.project-card {
  background: var(--card);
  padding: 20px;
  border-radius: 12px;
  transition: 0.3s;
}

.project-card:hover {
  transform: translateY(-5px);
}

.status {
  display: inline-block;
  margin: 10px 0;
  font-size: 0.8rem;
}

.active { color: green; }
.completed { color: gray; }

/* CATEGORIES */
.categories {
  padding: 2rem;
  text-align: center;
}

.filters button {
  margin: 5px;
  padding: 8px 16px;
}

/* CONTACT */
.contact {
  padding: 3rem 2rem;
}

.contact form {
  max-width: 400px;
  margin: auto;
  display: flex;
  flex-direction: column;
}

.contact input, textarea {
  margin-bottom: 10px;
  padding: 10px;
}

/* FOOTER */
footer {
  text-align: center;
  padding: 1rem;
  background: var(--card);
}