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

body {
  font-family: 'Inter', sans-serif;
  line-height: 1.6;
  color: #333;
  scroll-behavior: smooth;
  transition: background 0.3s, color 0.3s;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header / Navigation */
.header {
  position: sticky;
  top: 0;
  background: #fff;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
  z-index: 1000;
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.logo {
  font-weight: 700;
  font-size: 1.5rem;
  color: #007BFF;
}

.nav-list {
  display: flex;
  gap: 20px;
  list-style: none;
}

.nav-list a {
  text-decoration: none;
  color: #333;
  font-weight: 500;
  transition: color 0.3s;
}

.nav-list a:hover {
  color: #007BFF;
}

.dark-mode-toggle {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1.2rem;
}

/* Hero Section */
.hero {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #6C63FF, #42A5F5);
  color: #fff;
  text-align: center;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 20px;
}

.hero p {
  font-size: 1.2rem;
  margin-bottom: 30px;
}

.btn-primary {
  background: #fff;
  color: #007BFF;
  padding: 12px 30px;
  border-radius: 30px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s;
}

.btn-primary:hover {
  background: #007BFF;
  color: #fff;
}

/* Features Section */
.section {
  padding: 80px 0;
}

.features h2,
.portfolio h2,
.testimonials h2,
.contact h2 {
  text-align: center;
  margin-bottom: 50px;
  font-size: 2.5rem;
  color: #007BFF;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 30px;
}

.feature-card {
  background: #f9f9f9;
  border-radius: 12px;
  padding: 30px 20px;
  text-align: center;
  transition: transform 0.3s;
}

.feature-card:hover {
  transform: translateY(-10px);
}

.feature-card .icon {
  font-size: 2.5rem;
  margin-bottom: 20px;
  color: #007BFF;
}

/* Portfolio Section */
.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
}

.portfolio-item {
  position: relative;
  overflow: hidden;
  border-radius: 12px;
}

.portfolio-item img {
  width: 100%;
  display: block;
  transition: transform 0.3s;
}

.portfolio-item:hover img {
  transform: scale(1.1);
}

.overlay {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.5rem;
  opacity: 0;
  transition: opacity 0.3s;
}

.portfolio-item:hover .overlay {
  opacity: 1;
}

/* Testimonials Section */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
}

.testimonial-card {
  background: #f1f1f1;
  padding: 30px 20px;
  border-radius: 12px;
  text-align: center;
  font-style: italic;
}

/* Contact Section */
.contact-form {
  display: flex;
  flex-direction: column;
  max-width: 600px;
  margin: 0 auto 30px;
  gap: 15px;
}

.contact-form input,
.contact-form textarea {
  padding: 15px;
  border-radius: 8px;
  border: 1px solid #ccc;
  font-size: 1rem;
  width: 100%;
}

.contact-form button {
  width: fit-content;
  align-self: center;
}

/* Social Icons */
.social-icons {
  display: flex;
  justify-content: center;
  gap: 20px;
}

.social-icons a {
  text-decoration: none;
  font-size: 1.5rem;
  transition: transform 0.3s;
}

.social-icons a:hover {
  transform: scale(1.2);
}

/* Footer */
.footer {
  background: #222;
  color: #fff;
  padding: 30px 0;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 20px;
  list-style: none;
  margin-top: 10px;
}

.footer-links a {
  text-decoration: none;
  color: #fff;
  transition: color 0.3s;
}

.footer-links a:hover {
  color: #007BFF;
}

/* Dark Mode */
body.dark-mode {
  background: #121212;
  color: #f1f1f1;
}

body.dark-mode .header {
  background: #1e1e1e;
  box-shadow: 0 2px 6px rgba(255,255,255,0.1);
}

body.dark-mode .features .feature-card,
body.dark-mode .testimonial-card {
  background: #1e1e1e;
}

body.dark-mode .portfolio-item .overlay {
  background: rgba(255,255,255,0.1);
}

body.dark-mode .footer {
  background: #1e1e1e;
}