/* style.css */
:root {
  --primary-blue: #0056b3;
  --secondary-blue: #007bff;
  --accent-light: #e6f2ff;
  --text-dark: #333333;
  --text-muted: #666666;
  --bg-white: #ffffff;
  --bg-light: #f8f9fa;
  --border-color: #dddddd;
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --transition-speed: 0.3s;
}

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

body {
  font-family: var(--font-main);
  background-color: var(--bg-white);
  color: var(--text-dark);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: var(--primary-blue);
  transition: color var(--transition-speed) ease;
}

a:hover {
  color: var(--secondary-blue);
}

/* Header & Navigation */
header {
  background-color: var(--bg-white);
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
  position: sticky;
  top: 0;
  z-index: 1000;
}

nav {
  display: flex;
  justify-content: center;
  padding: 1rem;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap; /* helps on very small screens */
  justify-content: center;
}

.nav-links li a {
  font-weight: 600;
  color: var(--text-dark);
  padding: 0.5rem 1rem;
  border-radius: 4px;
  position: relative;
  transition: all var(--transition-speed) ease;
}

.nav-links li a::after {
  content: '';
  position: absolute;
  width: 0;
  height: 2px;
  bottom: 0;
  left: 50%;
  background-color: var(--primary-blue);
  transition: all var(--transition-speed) ease;
  transform: translateX(-50%);
}

.nav-links li a:hover::after,
.nav-links li a.active::after {
  width: 100%;
}

.nav-links li a:hover,
.nav-links li a.active {
  color: var(--primary-blue);
  background-color: var(--accent-light);
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

/* Typography */
h1, h2, h3 {
  margin-bottom: 1rem;
  color: var(--text-dark);
}

h1 {
  font-size: 2.5rem;
  letter-spacing: -0.5px;
}

h2 {
  font-size: 2rem;
  color: var(--primary-blue);
  border-bottom: 2px solid var(--accent-light);
  padding-bottom: 0.5rem;
  margin-top: 2rem;
}

p {
  margin-bottom: 1.5rem;
  color: var(--text-muted);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  background-color: var(--primary-blue);
  color: var(--bg-white);
  border-radius: 5px;
  font-weight: 600;
  box-shadow: 0 4px 6px rgba(0, 86, 179, 0.2);
  transition: transform var(--transition-speed), box-shadow var(--transition-speed), background-color var(--transition-speed);
}

.btn:hover {
  background-color: var(--secondary-blue);
  color: var(--bg-white);
  transform: translateY(-2px);
  box-shadow: 0 6px 12px rgba(0, 123, 255, 0.3);
}

/* Home Page Specifics */
.hero {
  text-align: center;
  padding: 4rem 1rem;
  animation: fadeIn 1s ease-out;
}

.hero p.subtitle {
  font-size: 1.25rem;
  max-width: 600px;
  margin: 0 auto 2rem auto;
}

.highlight {
  color: var(--primary-blue);
  font-weight: bold;
}

/* About Me Page Specifics */
.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-top: 2rem;
}

.about-image {
  text-align: center;
}

.about-image img {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
  box-shadow: 0 8px 16px rgba(0,0,0,0.1);
  transition: transform var(--transition-speed) ease;
}

.about-image img:hover {
  transform: scale(1.02);
}

.section-card {
  background: var(--bg-white);
  padding: 1.5rem;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
  border: 1px solid var(--border-color);
  transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
}

.section-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.1);
}

/* Skills Tags */
.skills-container {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skill-tag {
  background-color: var(--accent-light);
  color: var(--primary-blue);
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-size: 0.875rem;
  font-weight: 600;
  border: 1px solid rgba(0, 86, 179, 0.2);
  transition: all var(--transition-speed);
  display: inline-block;
}

.skill-tag:hover {
  background-color: var(--primary-blue);
  color: var(--bg-white);
}

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

.course-tag {
  background-color: var(--bg-light);
  color: var(--text-dark);
  padding: 0.4rem 0.8rem;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 500;
  border: 1px solid var(--border-color);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.course-tag i {
  color: var(--text-muted);
}

/* CV Viewer & Downloads */
.cv-iframe-container {
  position: relative;
  width: 100%;
  height: 0;
  padding-bottom: 141.4%; /* Aspects ratio of A4 roughly */
  margin-top: 1rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

.cv-iframe-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.cv-download {
  margin-top: 2rem;
  text-align: center;
}

/* Projects Placeholder */
.projects-container {
  text-align: center;
  padding: 4rem 1rem;
}

.projects-container i {
  font-size: 4rem;
  color: var(--primary-blue);
  margin-bottom: 1rem;
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in {
  animation: fadeIn 0.8s ease-out forwards;
}

/* Responsive Design (Tablet and Desktop) */
@media (min-width: 768px) {
  .about-grid {
    grid-template-columns: 1fr 2fr;
    align-items: start;
  }
  
  h1 {
    font-size: 3rem;
  }
  
  .cv-iframe-container {
    padding-bottom: 800px; /* fixed height for larger screens */
  }
}

/* Banner */
.banner {
  width: 100%;
  height: 250px;
  object-fit: cover;
  display: block;
}

/* Footer */
footer {
  text-align: center;
  padding: 2rem 1rem;
  margin-top: 3rem;
  color: var(--text-muted);
  font-size: 0.9rem;
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-white);
}

.social-links {
  margin-bottom: 1rem;
}

.social-links a {
  display: inline-block;
  margin: 0 0.5rem;
  color: var(--text-muted);
  font-size: 1.5rem;
  transition: color var(--transition-speed), transform var(--transition-speed);
}

.social-links a:hover {
  color: var(--primary-blue);
  transform: translateY(-2px);
}

/* Projects Grid */
.projects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-top: 2rem;
}

@media (min-width: 768px) {
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .projects-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.project-card {
  background: var(--bg-white);
  padding: 1.5rem;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
  border: 1px solid var(--border-color);
  transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.1);
}

.project-card h2 {
  font-size: 1.5rem;
  margin-top: 0;
  border-bottom: none;
  padding-bottom: 0;
}

.project-card p {
  flex-grow: 1;
}

.project-skills {
  margin-top: 1rem;
  margin-bottom: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* Modals */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 2000;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-speed) ease;
}

.modal-overlay.show {
  opacity: 1;
  pointer-events: auto;
}

.modal-content {
  background: var(--bg-white);
  padding: 2.5rem;
  border-radius: 12px;
  width: 90%;
  max-width: 700px;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  transform: translateY(20px);
  transition: transform var(--transition-speed) ease;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.modal-overlay.show .modal-content {
  transform: translateY(0);
}

.close-modal {
  position: absolute;
  top: 1rem;
  right: 1.5rem;
  font-size: 2rem;
  color: var(--text-muted);
  cursor: pointer;
  transition: color var(--transition-speed);
  line-height: 1;
}

.close-modal:hover {
  color: var(--primary-blue);
}

.modal-content h2 {
  margin-top: 0;
  border-bottom: 2px solid var(--accent-light);
  padding-bottom: 0.5rem;
  margin-bottom: 1.5rem;
}

.modal-content .project-skills {
  margin-top: 2rem;
}