/**
 * main.css — Core layout, grid system, typography, and responsive design
 * 
 * Mobile-first approach using min-width breakpoints.
 * Uses CSS Grid and Flexbox for layout.
 */

/* ======================================================
   CSS Reset & Base Styles
   ====================================================== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 70px; /* Offset for fixed navbar */
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  transition: background-color var(--transition-speed) var(--transition-fn),
              color var(--transition-speed) var(--transition-fn);
}

/* Custom scrollbar */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--scrollbar-track);
}

::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}

/* ======================================================
   Typography
   ====================================================== */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-heading);
  font-weight: 600;
  line-height: 1.3;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.25rem; }

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

a:hover {
  color: var(--accent-purple);
}

p {
  margin-bottom: 1rem;
  color: var(--text-primary);
}

/* ======================================================
   Layout Containers
   ====================================================== */
.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Generic section spacing */
.section {
  padding: 80px 0;
}

/* Section heading with terminal-style prefix */
.section__title {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  margin-bottom: 40px;
  color: var(--text-heading);
  display: flex;
  align-items: center;
  gap: 12px;
}

.section__title::before {
  content: '~$';
  color: var(--prompt-color);
  font-weight: 700;
}

/* Decorative line after section title */
.section__title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border-color);
  margin-left: 16px;
}

/* ======================================================
   Navigation Bar
   ====================================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--bg-nav);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: 0 20px;
  transition: background-color var(--transition-speed) var(--transition-fn);
}

.navbar__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1100px;
  margin: 0 auto;
  height: 60px;
}

/* Logo / Brand */
.navbar__logo {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--accent-green);
  display: flex;
  align-items: center;
  gap: 6px;
}

.navbar__logo-caret {
  color: var(--accent-blue);
  animation: blink 1s step-end infinite;
}

/* Nav Links */
.navbar__links {
  display: none; /* Hidden on mobile — shown via media query */
  list-style: none;
  gap: 8px;
}

.navbar__links a {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-secondary);
  padding: 8px 14px;
  border-radius: 4px;
  transition: all var(--transition-speed) var(--transition-fn);
}

.navbar__links a:hover,
.navbar__links a.active {
  color: var(--accent-blue);
  background: var(--bg-tertiary);
}

/* Right-side controls (theme toggle + hamburger) */
.navbar__controls {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Theme toggle button */
.theme-toggle {
  background: none;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 6px 8px;
  cursor: pointer;
  color: var(--text-primary);
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-speed) var(--transition-fn);
  width: 36px;
  height: 36px;
}

.theme-toggle:hover {
  background: var(--bg-tertiary);
  border-color: var(--accent-blue);
}

/* Hamburger menu button (mobile only) */
.hamburger {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 1001;
}

/* Mobile nav overlay */
.mobile-nav {
  position: fixed;
  top: 60px;
  left: 0;
  right: 0;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 20px;
  transform: translateY(-120%);
  transition: transform 0.3s var(--transition-fn);
  z-index: 999;
  box-shadow: 0 8px 32px var(--shadow-color);
}

.mobile-nav.open {
  transform: translateY(0);
}

.mobile-nav__links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.mobile-nav__links a {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--text-secondary);
  padding: 12px 16px;
  border-radius: 4px;
  transition: all var(--transition-speed) var(--transition-fn);
}

.mobile-nav__links a:hover,
.mobile-nav__links a.active {
  color: var(--accent-blue);
  background: var(--bg-tertiary);
}

/* ======================================================
   Hero Section
   ====================================================== */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 80px 20px 40px;
  position: relative;
}

.hero__terminal {
  width: 100%;
  max-width: 680px;
}

/* Scroll-down arrow */
.hero__scroll-indicator {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  color: var(--text-secondary);
  font-size: 1.5rem;
  cursor: pointer;
  opacity: 0.6;
  transition: opacity var(--transition-speed) var(--transition-fn);
}

.hero__scroll-indicator:hover {
  opacity: 1;
  color: var(--accent-blue);
}

/* ======================================================
   About Section
   ====================================================== */
.about__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: start;
}

.about__bio {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--text-primary);
}

.about__bio-line {
  margin-bottom: 8px;
  padding-left: 20px;
  position: relative;
}

.about__bio-line::before {
  content: '$';
  position: absolute;
  left: 0;
  color: var(--prompt-color);
  font-weight: 600;
}

/* ======================================================
   Skills Section
   ====================================================== */
.skills__categories {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
}

.skills__category {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 24px;
}

.skills__category-title {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--accent-green);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.skills__category-title::before {
  content: '>';
  color: var(--prompt-color);
  font-weight: 700;
}

.skills__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

/* ======================================================
   Blog Section
   ====================================================== */
.blog__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.blog-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: hidden;
  text-decoration: none;
  display: block;
}

.blog-card__header {
  padding: 12px 16px;
  background: var(--terminal-header);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 8px;
}

.blog-card__body {
  padding: 20px;
}

.blog-card__title {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--accent-blue);
  margin-bottom: 8px;
  line-height: 1.4;
}

.blog-card__meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
  display: flex;
  gap: 16px;
}

.blog-card__excerpt {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 12px;
}

.blog-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.blog-card__tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 2px 8px;
  background: var(--bg-tertiary);
  color: var(--accent-purple);
  border-radius: 3px;
  border: 1px solid var(--terminal-border);
}

/* ======================================================
   Contact Section
   ====================================================== */
.contact__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.contact__form-group {
  margin-bottom: 16px;
}

.contact__form-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--prompt-color);
  margin-bottom: 6px;
}

.contact__social {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 16px;
}

.contact__social-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  transition: all var(--transition-speed) var(--transition-fn);
}

.contact__social-link:hover {
  border-color: var(--accent-blue);
  color: var(--accent-blue);
  transform: translateY(-2px);
}

/* ======================================================
   Skill Bars — progress bars within skill categories
   ====================================================== */

.skill-bar {
  margin-bottom: 14px;
}

.skill-bar__label {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.skill-bar__track {
  height: 8px;
  background: var(--skill-bar-bg);
  border-radius: 4px;
  overflow: hidden;
}

/** Fill element — width set via JS + data-width attribute */
.skill-bar__fill {
  height: 100%;
  width: 0; /* Initial width — animated to data-width by JS */
  background: var(--skill-bar-fill);
  border-radius: 4px;
  /* transition is added via .animate class in animations.css */
}

/* Color variants for different skill categories */
.skill-bar__fill--green  { background: var(--accent-green); }
.skill-bar__fill--purple { background: var(--accent-purple); }
.skill-bar__fill--orange { background: var(--accent-orange); }

/* ======================================================
   Skill Tags — chip badges
   ====================================================== */

.skill-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 4px 10px;
  background: var(--bg-tertiary);
  color: var(--accent-purple);
  border: 1px solid var(--terminal-border);
  border-radius: 4px;
  transition: all var(--transition-speed) var(--transition-fn);
}

.skill-tag:hover {
  border-color: var(--accent-purple);
  background: rgba(188, 140, 255, 0.1);
}

/* ======================================================
   Footer
   ====================================================== */
.footer {
  text-align: center;
  padding: 30px 20px;
  border-top: 1px solid var(--border-color);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.footer__heart {
  color: var(--accent-red);
}

/* ======================================================
   Responsive Breakpoints — Mobile First
   ====================================================== */

/* Tablet: 640px and up */
@media (min-width: 640px) {
  h1 { font-size: 2.25rem; }
  h2 { font-size: 2rem; }

  .about__grid {
    grid-template-columns: auto 1fr;
  }

  .skills__categories {
    grid-template-columns: repeat(2, 1fr);
  }

  .blog__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .contact__grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* Desktop: 768px and up */
@media (min-width: 768px) {
  .navbar__links {
    display: flex; /* Show desktop nav links */
  }

  .hamburger {
    display: none; /* Hide hamburger on desktop */
  }

  .mobile-nav {
    display: none; /* Never show mobile nav on desktop */
  }

  .section {
    padding: 100px 0;
  }

  .section__title {
    font-size: 1.75rem;
  }
}

/* Large Desktop: 1024px and up */
@media (min-width: 1024px) {
  h1 { font-size: 2.5rem; }

  .container {
    padding: 0 40px;
  }
}