/*
  Custom styles for Mutassimal Zeem's portfolio
  Inspired by modern developer portfolios with a clean dark theme and vibrant accents.
  The design uses CSS variables for easy theming and responsive grids for layout.
*/

/* Root variables for colours and sizing */
:root {
  --primary: #64ffda;        /* accent colour for links and highlights */
  --secondary: #8892b0;      /* secondary text colour */
  --bg: #0a192f;             /* main background colour */
  --bg-light: #112240;       /* lighter background for cards */
  --text: #ccd6f6;           /* primary text colour */
  --card-bg: #112240;        /* card background */
  --border-radius: 12px;     /* base border radius */
}

/* Global reset and typography */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', 'Montserrat', sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Navigation bar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  padding: 1rem 2rem;
  background: rgba(10, 25, 47, 0.8);
  backdrop-filter: blur(10px);
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 1000;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
}

.logo-accent {
  color: var(--primary);
}

.nav-links a {
  margin-left: 1.5rem;
  color: var(--text);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.2s ease;
}

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

/* Hero section */
.hero {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding-top: 5rem; /* offset for fixed nav */
  background: radial-gradient(circle at top left, rgba(100, 255, 218, 0.1), transparent 70%);
}

.hero-content {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  width: 100%;
  padding: 0 2rem;
}

.hero-text {
  flex: 1 1 500px;
}

.hero-intro {
  color: var(--primary);
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.hero-name {
  font-size: 2.8rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.5rem;
}

.hero-title {
  font-size: 1.8rem;
  font-weight: 600;
  color: var(--secondary);
  margin-bottom: 1rem;
}

.hero-description {
  font-size: 1rem;
  color: var(--secondary);
  margin-bottom: 1.5rem;
  max-width: 600px;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: var(--border-radius);
  text-decoration: none;
  font-weight: 500;
  border: 2px solid var(--primary);
  transition: background 0.3s ease, color 0.3s ease;
}

.btn-primary {
  background: var(--primary);
  color: var(--bg);
}

.btn-primary:hover {
  background: transparent;
  color: var(--primary);
}

.btn-secondary {
  background: transparent;
  color: var(--primary);
}

.btn-secondary:hover {
  background: var(--primary);
  color: var(--bg);
}

.hero-image {
  flex: 1 1 350px;
  display: flex;
  justify-content: center;
}

.hero-image img {
  width: 100%;
  max-width: 350px;
  border-radius: var(--border-radius);
  box-shadow: 0 0 20px rgba(2, 12, 27, 0.5);
}

/* Generic section styling */
.section {
  padding: 6rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.section h2 {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 2rem;
  color: var(--text);
}

.section p {
  font-size: 1rem;
  color: var(--secondary);
  max-width: 800px;
  margin: 0 auto 3rem auto;
  text-align: center;
}

/* Stats grid */
.stats-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem;
}

.stat-card {
  background: var(--card-bg);
  padding: 2rem;
  border-radius: var(--border-radius);
  text-align: center;
  width: 160px;
  box-shadow: 0 4px 12px rgba(2, 12, 27, 0.5);
  transition: transform 0.2s ease;
}

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

.stat-card h3 {
  font-size: 2rem;
  color: var(--primary);
  margin-bottom: 0.5rem;
}

.stat-card p {
  font-size: 0.9rem;
  color: var(--secondary);
}

/* Skills section */
.skills-categories {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}

.skills-category {
  background: var(--card-bg);
  padding: 1.5rem 1rem;
  border-radius: var(--border-radius);
  box-shadow: 0 4px 12px rgba(2, 12, 27, 0.5);
}

.skills-category h3 {
  font-size: 1.3rem;
  color: var(--primary);
  margin-bottom: 0.75rem;
}

.skills-category ul {
  list-style: none;
}

.skills-category li {
  font-size: 0.95rem;
  color: var(--secondary);
  margin-bottom: 0.4rem;
}

/* Timeline for education */
.timeline {
  border-left: 2px solid var(--primary);
  position: relative;
  margin-left: 0.5rem;
}

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

.timeline-dot {
  position: absolute;
  left: -9px;
  top: 0;
  width: 18px;
  height: 18px;
  background: var(--primary);
  border-radius: 50%;
}

.timeline-content {
  background: var(--card-bg);
  padding: 1.5rem;
  border-radius: var(--border-radius);
  box-shadow: 0 4px 12px rgba(2, 12, 27, 0.5);
}

.timeline-content h3 {
  color: var(--text);
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
}

.timeline-location {
  font-size: 0.95rem;
  color: var(--primary);
  margin-bottom: 0.25rem;
}

.timeline-date {
  font-size: 0.85rem;
  color: var(--secondary);
  margin-bottom: 0.5rem;
}

.timeline-desc {
  font-size: 0.9rem;
  color: var(--secondary);
}

/* Experience section */
.experience-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  justify-content: center;
}

.experience-card {
  background: var(--card-bg);
  padding: 1.5rem;
  border-radius: var(--border-radius);
  box-shadow: 0 4px 12px rgba(2, 12, 27, 0.5);
  flex: 1 1 350px;
  transition: transform 0.2s ease;
}

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

.experience-card h3 {
  color: var(--primary);
  font-size: 1.4rem;
  margin-bottom: 0.5rem;
}

.experience-date {
  font-size: 0.85rem;
  color: var(--secondary);
  margin-bottom: 0.75rem;
}

.experience-card p {
  font-size: 0.95rem;
  color: var(--secondary);
}

/* Projects section */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.project-card {
  background: var(--card-bg);
  padding: 1.5rem;
  border-radius: var(--border-radius);
  box-shadow: 0 4px 12px rgba(2, 12, 27, 0.5);
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease;
}

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

.project-card h3 {
  color: var(--text);
  font-size: 1.3rem;
  margin-bottom: 0.5rem;
}

.project-desc {
  font-size: 0.9rem;
  color: var(--secondary);
  margin-bottom: 0.75rem;
  flex: 1;
}

.project-tech {
  font-size: 0.8rem;
  color: var(--secondary);
  margin-bottom: 0.75rem;
}

.project-link {
  align-self: flex-start;
  display: inline-block;
  color: var(--primary);
  text-decoration: none;
  border: 1px solid var(--primary);
  padding: 0.4rem 0.8rem;
  border-radius: var(--border-radius);
  font-size: 0.85rem;
  transition: background 0.2s ease;
}

.project-link:hover {
  background: var(--primary);
  color: var(--bg);
}

/* Contact section */
.contact-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  background: var(--card-bg);
  padding: 0.8rem 1rem;
  border-radius: var(--border-radius);
  box-shadow: 0 4px 12px rgba(2, 12, 27, 0.5);
}

.contact-item i {
  color: var(--primary);
  font-size: 1.2rem;
}

.contact-item a,
.contact-item span {
  color: var(--secondary);
  font-size: 0.95rem;
  text-decoration: none;
}

.contact-item a:hover {
  color: var(--primary);
}

/* Footer */
.footer {
  padding: 2rem;
  text-align: center;
  background: #020c1b;
  color: var(--secondary);
  font-size: 0.85rem;
}

/* Responsive tweaks */
@media (max-width: 768px) {
  .hero-content {
    flex-direction: column;
    text-align: center;
  }

  .hero-text {
    margin-bottom: 2rem;
  }

  .nav-links a {
    margin-left: 1rem;
  }
}