/* ---------------------------
   Root Variables
---------------------------- */
:root {
  --primary-blue: #0d6efd;
  --secondary-blue: #6610f2;
  --dark: #111;
  --light: #f8f9fa;
  --white: #fff;
  --gray: #6c757d;
  --accent: #ffc107; /* NEW: Accent color (yellow) */

  --font-heading: 'Montserrat', sans-serif;
  --font-body: 'Open Sans', sans-serif;

  --transition: 0.3s ease;
}

/* ---------------------------
   Global Styles
---------------------------- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-body);
  line-height: 1.6;
  color: var(--dark);
  background: var(--light);
}

h1, h2, h3 {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--dark);
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

.container {
  width: 90%;
  max-width: 1100px;
  margin: auto;
}

/* ---------------------------
   Header
---------------------------- */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--white);
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
  padding: 1rem 0;
}

.header h1 {
  font-size: 1.5rem;
}

.header nav ul {
  display: flex;
  gap: 1rem;
  list-style: none;
}

.header nav a {
  color: var(--dark);
  font-weight: 600;
}

.header nav a:hover {
  color: var(--primary-blue);
}

/* ---------------------------
   Hero Section
---------------------------- */
.hero-section {
  text-align: center;
  padding: 4rem 1rem;
  background: linear-gradient(135deg, var(--primary-blue), var(--secondary-blue));
  color: var(--white);
  border-radius: 0 0 2rem 2rem;
  box-shadow: 0 4px 10px rgba(0,0,0,0.15);
}

.hero-section h2 {
  font-size: 3.5rem;
  margin-bottom: 1rem;
}

.hero-section .tagline {
  font-size: 1.25rem;
  margin-bottom: 2rem;
}

/* CTA button now uses accent */
.cta-button {
  background: var(--accent);
  color: var(--dark);
  padding: 0.9rem 2rem;
  border-radius: 50px;
  font-weight: 700;
  font-size: 1.1rem;
  display: inline-block;
  box-shadow: 0 4px 10px rgba(0,0,0,0.2);
  transition: var(--transition);
}

.cta-button:hover {
  background: #e0a800;
  transform: translateY(-3px);
}

/* ---------------------------
   Section Titles
---------------------------- */
section h2 {
  font-size: 2rem;
  margin-bottom: 1.5rem;
  text-align: center;
  color: var(--primary-blue);
}

/* Alternate background */
section:nth-child(even) {
  background: var(--white);
  border-radius: 1rem;
  padding: 3rem 1rem;
  margin: 2rem 0;
}

/* ---------------------------
   About Section
---------------------------- */
.about-section {
  padding: 3rem 1rem;
}

/* ---------------------------
   Skills Section
---------------------------- */
.skills-section {
  padding: 3rem 1rem;
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.skill-card {
  background: var(--white);
  border: 1px solid #eee;
  border-radius: 1rem;
  padding: 1.5rem;
  box-shadow: 0 2px 6px rgba(0,0,0,0.05);
  transition: var(--transition);
}

.skill-card:hover {
  transform: translateY(-5px);
  border-color: var(--accent);
}

.skill-card h3 {
  margin-bottom: 1rem;
  font-size: 1.2rem;
  border-bottom: 3px solid var(--accent);
  display: inline-block;
  padding-bottom: 0.3rem;
}

/* ---------------------------
   Projects Section
---------------------------- */
.projects-section {
  padding: 3rem 1rem;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.project-card {
  background: var(--white);
  border-radius: 1rem;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}

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

.project-card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.card-content {
  padding: 1rem;
  flex-grow: 1;
}

.project-links {
  margin-top: 1rem;
  display: flex;
  gap: 0.5rem;
}

.project-links a {
  flex: 1;
  text-align: center;
  padding: 0.6rem;
  border-radius: 6px;
  font-weight: 600;
  transition: var(--transition);
}

.btn-demo {
  background: var(--accent);
  color: var(--dark);
}

.btn-demo:hover {
  background: #e0a800;
}

.btn-github {
  background: var(--dark);
  color: var(--white);
}

.btn-github:hover {
  background: #333;
}

/* ---------------------------
   Contact Section
---------------------------- */
.contact-section {
  padding: 3rem 1rem;
  text-align: center;
}

.contact-links {
  margin-top: 1.5rem;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.contact-button {
  background: var(--primary-blue);
  color: var(--white);
  padding: 0.8rem 1.5rem;
  border-radius: 50px;
  font-weight: 600;
  transition: var(--transition);
}

.contact-button:hover {
  background: var(--accent);
  color: var(--dark);
  transform: translateY(-3px);
}

/* ---------------------------
   Footer
---------------------------- */
.footer {
  background: var(--dark);
  color: #bbb;
  padding: 2rem 1rem;
  text-align: center;
  border-radius: 2rem 2rem 0 0;
}

.footer .social-links {
  margin-top: 1rem;
  display: flex;
  justify-content: center;
  gap: 1rem;
}

.footer .social-links a {
  color: #bbb;
  font-size: 1.4rem;
  transition: var(--transition);
}

.footer .social-links a:hover {
  color: var(--accent);
}

/* ---------------------------
   Responsive
---------------------------- */
@media (max-width: 992px) {
  .hero-section h2 {
    font-size: 2.5rem;
  }
}

@media (max-width: 768px) {
  .header nav ul {
    flex-direction: column;
    align-items: center;
  }
  .hero-section {
    padding: 3rem 1rem;
  }
  .skills-grid, .project-grid {
    grid-template-columns: 1fr;
  }
}