/* =========================================
   1. SETUP & VARIABLES
   ========================================= */


@font-face {
  font-family: 'Nunito';
  src: url('../assets/fonts/Nunito-VariableFont_wght.ttf') format('truetype');
  font-weight: 100 900; /* Supports all variable weights */
}

/* Colour Palette and Sizing */
:root {
  --primary-blue: #0056b3;      /* Deep blue */
  --primary-hover: #004494;     /* Slightly darker for hover */
  --secondary-blue: #e6f0fa;    /* Very light blue for subtle backgrounds */
  --bg-color: #f8f9fa;          /* Off-white minimalist background */
  --card-bg: #ffffff;           /* Crisp white for portfolio cards */
  --text-main: #2b303a;         /* Dark slate gray */
  --text-muted: #6c757d;        /* Gray for secondary text */
  --transition-speed: 0.2s;
}

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

html {
  scroll-behavior: smooth; 
}

body {
  font-family: 'Nunito', sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.6;
}

/* =========================================
   2. LAYOUT & TYPOGRAPHY
   ========================================= */

.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: 100px 0;
}

h1, h2, h3, h4 {
  font-weight: 800;
  margin-bottom: 15px;
  color: var(--primary-blue);
}

h2 {
  font-size: 2.5rem;
  border-bottom: 3px solid var(--secondary-blue);
  display: inline-block;
  padding-bottom: 5px;
  margin-bottom: 40px;
}

p {
  margin-bottom: 20px;
  font-size: 1.1rem;
}

/* =========================================
   3. NAVIGATION BAR
   ========================================= */

header {
  background-color: var(--card-bg);
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
  position: sticky;
  top: 0;
  z-index: 1000;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1000px;
  margin: 0 auto;
  padding: 20px;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary-blue);
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 30px;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-main);
  font-weight: 600;
  transition: color var(--transition-speed);
}

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

/* Hides the mobile menu icon on desktop screens */
.menu-toggle {
  display: none;
  font-size: 1.8rem;
  color: var(--primary-blue);
  cursor: pointer;
}

/* =========================================
   4. BUTTONS & ANIMATIONS
   ========================================= */

.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 700;
  cursor: pointer;
  border: none;
  transition: background-color var(--transition-speed), transform 0.1s ease;
}

.btn:active {
  transform: scale(0.95);
}

.primary-btn {
  background-color: var(--primary-blue);
  color: #fff;
}

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

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

.secondary-btn:hover {
  background-color: #d0e3f7;
}

/* =========================================
   5. PORTFOLIO & CARDS
   ========================================= */

.portfolio-category {
  margin-bottom: 50px;
}

.grid-container {
  display: grid;
  grid-template-columns: repeat(2, 1fr); 
  gap: 30px;
}

.card {
  background-color: var(--card-bg);
  padding: 25px;
  border-radius: 12px;
  box-shadow: 0 4px 15px rgba(0,0,0,0.03);
  transition: transform var(--transition-speed), box-shadow var(--transition-speed);
  height: 310px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px rgba(0,0,0,0.08);
}

.project-image {
  width: 100%;
  height: auto;
  border-radius: 8px;
  margin-top: 10px;
  margin-bottom: 0px;
  border: 2px solid var(--primary-blue);
}

/* =========================================
   6. EXPERIENCE TIMELINE
   ========================================= */

.timeline {
  border-left: 3px solid var(--secondary-blue);
  padding-left: 30px;
  margin-left: 15px;
}

.experience-item {
  position: relative;
  margin-bottom: 40px;
}

.experience-item::before {
  content: '';
  position: absolute;
  left: -41px;
  top: 5px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background-color: var(--primary-blue);
  border: 4px solid var(--bg-color);
}

.experience-item h4 {
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: 10px;
}

/* =========================================
   7. SKILLS
   ========================================= */

.skills-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 15px;
}

.skill-tag {
  background-color: var(--card-bg);
  color: var(--primary-blue);
  padding: 10px 20px;
  border-radius: 30px;
  font-weight: 700;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}

.skill-tag:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 25px rgba(0,0,0,0.08);
}

/* =========================================
   9. FOOTER
   ========================================= */

footer {
  text-align: center;
  padding: 30px 0;
  background-color: var(--card-bg);
  color: var(--text-muted);
  margin-top: 50px;
}

/* =========================================
   10. MOBILE RESPONSIVENESS
   ========================================= */

@media (max-width: 768px) {

  .menu-toggle {
    display: block; 
  }


  .nav-links {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 70px;
    left: 0;
    width: 100%;
    background-color: var(--card-bg);
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
    padding: 20px 0;
    text-align: center;
  }

  .nav-links.active {
    display: flex;
  }

  .nav-links li {
    margin: 15px 0;
  }

  .grid-container {
    padding: 15px;
    grid-template-columns: 1fr;
  }
  
  h2 {
    font-size: 2rem;
  }
  
  .section {
    padding: 60px 0;
    scroll-margin-top: 50px;
  }

  .experience-btn-container {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 5px;
  }
}