/* ============================================================
   PORTFOLIO STYLESHEET
   Structure:
   1. CSS Variables (colors, fonts, spacing)
   2. Reset & Base Styles
   3. Navigation
   4. Hero Section
   5. Shared Section Styles
   6. Projects Grid
   7. Skills Section
   8. Contact Section
   9. Footer
   10. Responsive (mobile-friendly breakpoints)
   ============================================================ */


/* ============================================================
   1. CSS VARIABLES
   Define your colors and fonts here once so you can reuse them
   everywhere. Change a value here and it updates across the site.
   ============================================================ */
:root {
  /* Color palette */
  --color-bg:        #0f1117;   /* main dark background */
  --color-bg-alt:    #161b27;   /* slightly lighter dark (for alternating sections) */
  --color-surface:   #1e2535;   /* card / panel background */
  --color-border:    #2a3347;   /* subtle border color */
  --color-accent:    #6c8fff;   /* primary accent — blue-purple */
  --color-accent-hover: #8aa4ff;
  --color-text:      #e2e8f0;   /* main body text */
  --color-muted:     #8892a4;   /* secondary / helper text */

  /* Typography */
  --font-heading: 'Poppins', sans-serif;
  --font-body:    'Inter', sans-serif;

  /* Spacing scale */
  --section-padding: 80px 0;
  --container-max:   900px;

  /* Transitions */
  --transition: 0.2s ease;
}


/* ============================================================
   2. RESET & BASE STYLES
   Remove browser default inconsistencies and set a baseline.
   ============================================================ */

/* Box-sizing: border-box makes width/height calculations intuitive */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  /* Smooth scrolling when clicking nav links */
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  font-size: 16px;
}

/* Remove default list bullets */
ul {
  list-style: none;
}

/* Make links inherit color by default */
a {
  color: inherit;
  text-decoration: none;
}

/* Images never overflow their containers */
img {
  max-width: 100%;
  display: block;
}


/* ============================================================
   3. NAVIGATION
   Fixed bar at the top so visitors can always jump to a section.
   ============================================================ */
.navbar {
  position: fixed;           /* stays at top as you scroll */
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;              /* sits above all other content */
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(20px, 5vw, 60px);  /* responsive side padding */
  height: 64px;
  background-color: rgba(15, 17, 23, 0.85); /* semi-transparent */
  backdrop-filter: blur(12px);             /* frosted-glass effect */
  border-bottom: 1px solid var(--color-border);
}

.nav-logo {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-accent);
}

.nav-links {
  display: flex;
  gap: 32px;
}

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-muted);
  transition: color var(--transition);
}

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

/* Hamburger button — hidden on desktop, shown on mobile */
.nav-toggle {
  display: none;          /* hidden by default; media query shows it */
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

/* The three lines of the hamburger icon */
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

/* Animate the 3 lines into an X when the menu is open */
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }


/* ============================================================
   4. HERO SECTION
   Full-screen opening section with two columns: text + photo.
   ============================================================ */
.hero {
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 100px clamp(20px, 5vw, 60px) 60px;
  position: relative;
  overflow: hidden;
}

/* Soft background glow that sits behind the photo */
.hero::before {
  content: '';
  position: absolute;
  top: 10%;
  right: -5%;
  width: 550px;
  height: 550px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(108, 143, 255, 0.07) 0%, transparent 70%);
  pointer-events: none; /* doesn't block clicks */
}

/* The two-column row that holds text + photo */
.hero-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 60px;
  max-width: var(--container-max);
  width: 100%;
}

.hero-content {
  flex: 1; /* takes up all remaining space next to the photo */
}

/* ---- Profile photo ---- */
.hero-photo {
  flex-shrink: 0; /* never shrink below its natural size */
}

/* The circle — works as a placeholder (with initials) or a real <img> */
.hero-avatar {
  width: 260px;
  height: 260px;
  border-radius: 50%;
  border: 2px solid var(--color-accent);
  background: linear-gradient(135deg, #1e2535 0%, #161b27 100%);
  box-shadow: 0 0 0 8px rgba(108, 143, 255, 0.08),
              0 0 60px rgba(108, 143, 255, 0.15);
  /* Centers the initials text */
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-size: 2.8rem;
  font-weight: 700;
  color: var(--color-accent);
  /* Crop the image to fill the circle, focused on the top (face area) */
  object-fit: cover;
  object-position: center 65%;
}

.hero-greeting {
  font-size: 1.1rem;
  color: var(--color-accent);
  font-weight: 500;
  margin-bottom: 8px;
}

.hero-name {
  font-family: var(--font-heading);
  font-size: clamp(2.4rem, 7vw, 4rem);  /* scales with viewport width */
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 12px;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(1.1rem, 3vw, 1.5rem);
  font-weight: 600;
  color: var(--color-muted);
  margin-bottom: 20px;
}

.hero-tagline {
  font-size: 1.05rem;
  color: var(--color-muted);
  max-width: 500px;
  margin-bottom: 36px;
}

/* Button group in the hero */
.hero-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;   /* wraps on small screens */
}

/* Base button styles */
.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 8px;
  font-weight: 500;
  font-size: 0.95rem;
  transition: background-color var(--transition), color var(--transition),
              border-color var(--transition), transform var(--transition);
}

/* Filled / primary button */
.btn-primary {
  background-color: var(--color-accent);
  color: #fff;
}

.btn-primary:hover {
  background-color: var(--color-accent-hover);
  transform: translateY(-2px);
}

/* Outlined / secondary button */
.btn-outline {
  border: 1.5px solid var(--color-border);
  color: var(--color-text);
}

.btn-outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-2px);
}


/* ============================================================
   5. SHARED SECTION STYLES
   Reusable classes for every section after the hero.
   ============================================================ */

/* Add top padding so sections don't hide under the fixed navbar */
.section {
  padding: var(--section-padding);
  scroll-margin-top: 64px;  /* offset scroll position by navbar height */
}

/* Alternating background to break up the page visually */
.section-alt {
  background-color: var(--color-bg-alt);
}

/* Centers content and limits max width */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 clamp(20px, 5vw, 40px);
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 700;
  margin-bottom: 8px;
}

.section-subtitle {
  color: var(--color-muted);
  margin-bottom: 48px;
  font-size: 1rem;
}


/* ============================================================
   6. PROJECTS GRID
   3-column grid that collapses to 1 column on mobile.
   ============================================================ */
.projects-grid {
  display: grid;
  /* auto-fill: create as many columns as fit; min 260px, max grows equally */
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}

/* Each project card */
.project-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  /* Smooth hover lift effect */
  transition: transform var(--transition), border-color var(--transition),
              box-shadow var(--transition);
}

.project-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-accent);
  box-shadow: 0 8px 32px rgba(108, 143, 255, 0.1);
}

/* Top row: title + GitHub icon */
.project-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.project-title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
}

/* GitHub icon link in the corner */
.project-link {
  color: var(--color-muted);
  flex-shrink: 0;
  transition: color var(--transition);
}

.project-link:hover {
  color: var(--color-accent);
}

.project-description {
  color: var(--color-muted);
  font-size: 0.9rem;
  flex-grow: 1;   /* pushes tags to the bottom of the card */
}

/* Tech stack tag row */
.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  background-color: rgba(108, 143, 255, 0.12);
  color: var(--color-accent);
  font-size: 0.78rem;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: 99px;  /* pill shape */
}


/* ============================================================
   7. SKILLS SECTION
   Two-column list of languages and tools.
   ============================================================ */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 32px;
}

.skills-group-title {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 20px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.skills-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.skill-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.95rem;
}

/* Small colored dot before each skill */
.skill-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-accent);
  flex-shrink: 0;
}


/* ============================================================
   8. CONTACT SECTION
   Centered text with two clickable contact cards.
   ============================================================ */
.contact-container {
  text-align: center;
}

.contact-blurb {
  color: var(--color-muted);
  max-width: 520px;
  margin: 0 auto 48px;
  font-size: 1rem;
}

.contact-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 20px;
}

/* Each contact option (email, GitHub) */
.contact-card {
  display: flex;
  align-items: center;
  gap: 12px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 20px 32px;
  font-size: 0.95rem;
  font-weight: 500;
  transition: border-color var(--transition), color var(--transition),
              transform var(--transition);
}

.contact-card:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-3px);
}


/* ============================================================
   SCROLL FADE-IN ANIMATION
   Elements start invisible and slightly below their resting position.
   JavaScript adds the "visible" class when they scroll into view,
   triggering the transition to full opacity and normal position.
   ============================================================ */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}


/* ============================================================
   9. FOOTER
   Simple one-line footer at the bottom.
   ============================================================ */
.footer {
  padding: 32px 20px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--color-muted);
  border-top: 1px solid var(--color-border);
}


/* ============================================================
   10. RESPONSIVE / MOBILE STYLES
   Media queries adjust layout for smaller screens.
   @media (max-width: X) means "apply these rules when screen
   width is X pixels or less."
   ============================================================ */

/* Tablet — collapse hero to single column before it gets too cramped */
@media (max-width: 768px) {
  .hero-inner {
    flex-direction: column-reverse; /* photo on top, text below */
    text-align: center;
    gap: 40px;
  }

  .hero-avatar {
    width: 180px;
    height: 180px;
    font-size: 2rem;
  }

  .hero-tagline {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-buttons {
    justify-content: center;
  }
}

/* Mobile and below */
@media (max-width: 640px) {

  /* Show the hamburger button on mobile */
  .nav-toggle {
    display: flex;
  }

  /* Hide nav links by default; they drop down when .open is added */
  .nav-links {
    display: none;
    flex-direction: column;
    gap: 0;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background-color: rgba(15, 17, 23, 0.97);
    border-bottom: 1px solid var(--color-border);
    padding: 8px 0 16px;
  }

  /* JavaScript adds this class to show the menu */
  .nav-links.open {
    display: flex;
  }

  .nav-links li {
    padding: 12px clamp(20px, 5vw, 60px);
  }

  .nav-links a {
    font-size: 1rem;
  }

  /* Stack hero buttons vertically */
  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    text-align: center;
  }

  /* Contact cards stack vertically */
  .contact-card {
    width: 100%;
    justify-content: center;
  }
}