/*
 * Global styles for the updated personal website.
 *
 * The site follows a dark colour scheme inspired by modern developer portfolios.
 * The palette uses a near‑black background with subtle contrasts for content cards
 * and a vibrant accent colour for interactive elements. Text remains highly
 * legible through the use of light greys and off‑whites. Typography leans on
 * sans‑serif fonts to convey a contemporary and professional feel.
 */

/* Import a Google Font for a clean sans‑serif appearance */
@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@300;400;600;700&display=swap');

/* CSS Reset and base styling */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Montserrat', sans-serif;
  /* Use the widely adopted One Dark palette as the base for our dark theme. */
  /* Background adopts the deep slate tone of One Dark (#282c34) for good readability */
  background-color: #282c34;
  /* Primary text uses the light grey from the One Dark palette (#abb2bf) */
  color: #abb2bf;
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  /* Blue accent for links based on One Dark (#61afef) */
  color: #61afef;
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  /* Green accent on hover (#98c379) */
  color: #98c379;
}

header {
  /* Slightly transparent header to separate it from the page content */
  background: rgba(40, 44, 52, 0.9);
  position: sticky;
  top: 0;
  width: 100%;
  z-index: 100;
  backdrop-filter: blur(6px);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

/* Hamburger menu toggle hidden on large screens */
.menu-toggle {
  display: none;
  font-size: 2rem;
  cursor: pointer;
  color: #61afef;
}

nav {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
}

nav .logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: #61afef; /* use blue accent for logo */
}

nav ul {
  list-style: none;
  display: flex;
  gap: 1.5rem;
}

nav ul li a {
  font-weight: 500;
  letter-spacing: 0.5px;
}

/* Hero section */
.hero {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 70vh;
  background-image: url('assets/hero-bg.png');
  background-size: cover;
  background-position: center;
  position: relative;
}

.hero::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
  background: rgba(40, 44, 52, 0.7);
  /* overlay to darken the image for better text contrast */
}

.hero-content {
  position: relative;
  text-align: center;
  max-width: 800px;
  padding: 2rem;
  z-index: 2;
}

/* headlined hero section heading */
.hero h1 {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.hero p {
  font-size: 1.25rem;
  max-width: 700px;
  margin: 0 auto 1.5rem auto;
  line-height: 1.5;
}

/*
 * Primary button styling
 * Uses a subtle gradient between the two accent colours for a more dynamic look,
 * with a larger border radius and drop shadow. Hovering transitions the
 * gradient direction and lifts the button slightly to mimic the original
 * website’s interactive feel.
 */
.btn-primary {
  display: inline-block;
  padding: 0.85rem 1.7rem;
  /* Frost gradient for call‑to‑action buttons */
  background-image: linear-gradient(45deg, #61afef, #98c379);
  color: #282c34;
  border-radius: 6px;
  font-weight: 600;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
  transition: transform 0.2s ease, box-shadow 0.2s ease, background-image 0.4s ease;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.5);
  background-image: linear-gradient(45deg, #98c379, #61afef);
  color: #282c34;
}

/* Section headings */
.section {
  padding: 4rem 1rem;
  max-width: 1100px;
  margin: 0 auto;
}

/* section headings */
.section h2 {
  font-size: 2.25rem;
  margin-bottom: 1rem;
  color: #61afef;
}

.section p {
  margin-bottom: 1rem;
}

/* Skills interactive list */
details {
  background: #303a46;
  border-radius: 4px;
  padding: 1rem;
  margin-bottom: 1rem;
  border: 1px solid #3e4451;
}

details summary {
  font-weight: 600;
  font-size: 1.1rem;
  cursor: pointer;
  outline: none;
  position: relative;
  color: #abb2bf;
}

details[open] summary::after {
  content: '−';
  position: absolute;
  right: 0;
  font-size: 1.3rem;
  top: 0;
  color: #61afef;
}

details summary::after {
  content: '+';
  position: absolute;
  right: 0;
  font-size: 1.3rem;
  top: 0;
  color: #61afef;
}

details p, details ul {
  padding-left: 1rem;
  margin-top: 0.5rem;
  color: #abb2bf;
}

/* Experience timeline */
.timeline {
  position: relative;
  padding-left: 2rem;
  margin-top: 2rem;
  border-left: 2px solid #61afef;
}

.timeline-entry {
  position: relative;
  margin-bottom: 2rem;
  padding-left: 1rem;
}

.timeline-entry::before {
  content: '';
  position: absolute;
  left: -11px;
  top: 3px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  /* timeline markers use green fill and blue border from the One Dark palette */
  background: #98c379;
  border: 2px solid #61afef;
}

.timeline-entry h3 {
  font-size: 1.3rem;
  color: #61afef;
  margin-bottom: 0.2rem;
}

/* company/organisation names in timeline */
.timeline-entry h4 {
  font-size: 1.1rem;
  font-weight: 600;
  color: #98c379;
  margin-bottom: 0.2rem;
}

.timeline-entry .date {
  font-size: 0.9rem;
  color: #7f8792;
  margin-bottom: 0.3rem;
}

.timeline-entry p {
  font-size: 0.95rem;
  line-height: 1.5;
}

/* Education and awards cards */
.card {
  background: #303a46;
  padding: 1.5rem;
  border-radius: 4px;
  margin-bottom: 1.5rem;
  border: 1px solid #3e4451;
}

.card h3 {
  font-size: 1.25rem;
  color: #61afef;
  margin-bottom: 0.5rem;
}

.card h4 {
  font-size: 1rem;
  color: #98c379;
  margin-bottom: 0.3rem;
}

.card ul {
  margin-left: 1rem;
  list-style: disc;
}

.button {
  background: #282c34;
}

.button p {
  font-size: 0.9rem;
  color: #7f8792;
}

.button a {

  display: inline-flex;
  align-items: center;
  justify-content: center;
  /* Display icons on a card‑coloured square so the symbol itself matches the text colour */
  width: 44px;
  height: 44px;
  border-radius: 8px;
  background: #303a46;
  border: 1px solid #3e4451;
  transition: background 0.2s ease, transform 0.2s ease;
}

.button a:hover {
  transform: translateY(-2px) scale(1.05);
  /* On hover, slightly lighten the button */
  background: #3e4451;
}

.button a i {
  font-size: 1.4rem;
  /* Use the same light grey as body text for the icons */
  color: #abb2bf;
}

.button a:hover i {
  color: #61afef;
}

/* Footer */
footer {
  background: #282c34;
  padding: 2rem 1rem;
  text-align: center;
  border-top: 1px solid #3e4451;
}

footer p {
  font-size: 0.9rem;
  color: #7f8792;
}

footer .socials {
  margin-bottom: 1rem;
}

footer .socials a {
  margin: 0 0.5rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  /* Display icons on a card‑coloured square so the symbol itself matches the text colour */
  width: 44px;
  height: 44px;
  border-radius: 8px;
  background: #303a46;
  border: 1px solid #3e4451;
  transition: background 0.2s ease, transform 0.2s ease;
}

footer .socials a:hover {
  transform: translateY(-2px) scale(1.05);
  /* On hover, slightly lighten the button */
  background: #3e4451;
}

/* Style the Font Awesome icons inside the social buttons */
footer .socials a i {
  font-size: 1.4rem;
  /* Use the same light grey as body text for the icons */
  color: #abb2bf;
}

/* On hover, switch the icon colour to the blue accent for an interactive feel */
footer .socials a:hover i {
  color: #61afef;
}

/* Responsive adjustments for small screens */
@media (max-width: 768px) {
  /* show hamburger icon on mobile */
  .menu-toggle {
    display: block;
    z-index: 110;
  }

  /* full‑screen mobile menu */
  nav ul {
    display: none;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: rgba(40, 44, 52, 0.96);
    justify-content: center;
    align-items: center;
    gap: 2rem;
    padding: 0;
    margin: 0;
    z-index: 100;
  }
  nav ul.active {
    display: flex;
  }
  nav ul li {
    margin: 0;
  }
  nav ul li a {
    font-size: 1.5rem;
    color: #abb2bf;
  }
  nav ul li {
    margin: 0;
  }
  .hero h1 {
    font-size: 2rem;
  }
  .hero p {
    font-size: 1rem;
  }
  .about-content {
    flex-direction: column;
    align-items: center;
  }
  .about-image {
    flex: none;
    margin-bottom: 1rem;
  }
  .about-image img {
    width: 140px;
    height: 140px;
  }
  .timeline {
    padding-left: 1rem;
  }
  .timeline-entry::before {
    left: -8px;
    width: 10px;
    height: 10px;
  }
}

/* Profile image styling */
/* Container for profile photo on legacy pages; kept for backward compatibility */
.profile-container {
  display: flex;
  justify-content: center;
  margin-top: 2rem;
  margin-bottom: 2rem;
}

/* Circular profile image styling */
.profile-photo {
  width: 300px;
  height: 300px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid #61afef;
  box-shadow: 0 0 15px rgba(0, 0, 0, 0.4);
}

/* Layout for the about section: image and text side by side */
.about-content {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 2rem;
  margin-top: 2rem;
  margin-bottom: 2rem;
}

/* Constrain image container width */
.about-image {
  flex: 0 0 200px;
}

/* Text in the about section takes remaining space */
.about-text {
  flex: 1;
}