/* ============================================================
   Imports
   ============================================================ */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

/* ============================================================
   CSS Custom Properties
   ============================================================ */
:root {
  --color-bg:          #F8F9FA;
  --color-text:        #212529;
  --color-accent:      #4D94D0;
  --color-accent-dark: #3578BE;
  --color-secondary-bg:#E9ECEF;
  --color-white:       #FFFFFF;
  --color-nav-bg:      #1A2E3B;
  --color-nav-text:    #F8F9FA;
  --font-family:       'Inter', sans-serif;
  --max-width:         960px;
  --section-padding:   60px 24px;
  --border-radius:     6px;
  --transition:        0.2s ease;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-family);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-width: 320px;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover,
a:focus {
  color: var(--color-accent-dark);
  text-decoration: underline;
}

a:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ============================================================
   Layout Utility
   ============================================================ */
.container {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: 24px;
}

/* ============================================================
   Navigation
   ============================================================ */
#site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-nav-bg);
  border-bottom: 2px solid var(--color-accent);
}

#site-nav.scrolled {
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.18);
}

.nav-inner {
  max-width: var(--max-width);
  margin-inline: auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.nav-brand {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-nav-text);
  letter-spacing: 0.02em;
  text-decoration: none;
}

.nav-brand:hover,
.nav-brand:focus {
  color: var(--color-accent);
  text-decoration: none;
}

#nav-links {
  list-style: none;
  display: flex;
  gap: 28px;
  align-items: center;
}

#nav-links a {
  color: var(--color-nav-text);
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}

#nav-links a:hover,
#nav-links a:focus {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
  text-decoration: none;
}

#nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  color: var(--color-nav-text);
}

.hamburger-icon {
  display: block;
  width: 24px;
  height: 2px;
  background-color: currentColor;
  position: relative;
}

.hamburger-icon::before,
.hamburger-icon::after {
  content: '';
  display: block;
  width: 24px;
  height: 2px;
  background-color: currentColor;
  position: absolute;
  left: 0;
  transition: transform var(--transition), top var(--transition);
}

.hamburger-icon::before { top: -7px; }
.hamburger-icon::after  { top: 7px; }

/* ============================================================
   Hero Section
   ============================================================ */
#hero {
  background-color: var(--color-nav-bg);
  color: var(--color-nav-text);
  padding: var(--section-padding);
  text-align: center;
}

.hero-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.hero-headshot {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--color-accent);
  flex-shrink: 0;
}

.hero-text h1 {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--color-white);
  line-height: 1.2;
  margin-bottom: 12px;
}

.hero-tagline {
  font-size: 1.1rem;
  color: #B2C8D1;
  max-width: 540px;
  margin-inline: auto;
  margin-bottom: 24px;
}

.hero-cta-group {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 10px 22px;
  border-radius: var(--border-radius);
  font-size: 0.9rem;
  font-weight: 600;
  transition: background-color var(--transition), color var(--transition), border-color var(--transition);
  text-decoration: none;
}

.btn:hover,
.btn:focus {
  text-decoration: none;
}

.btn-primary {
  background-color: var(--color-accent);
  color: var(--color-white);
  border: 2px solid var(--color-accent);
}

.btn-primary:hover,
.btn-primary:focus {
  background-color: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
  color: var(--color-white);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-nav-text);
  border: 2px solid var(--color-nav-text);
}

.btn-outline:hover,
.btn-outline:focus {
  background-color: var(--color-nav-text);
  color: var(--color-nav-bg);
}

/* ============================================================
   Section Headings
   ============================================================ */
.section-heading {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.section-divider {
  width: 48px;
  height: 3px;
  background-color: var(--color-accent);
  border: none;
  margin-bottom: 32px;
  border-radius: 2px;
}

/* ============================================================
   About Section
   ============================================================ */
#about {
  padding: var(--section-padding);
  background-color: var(--color-bg);
}

.about-body {
  max-width: 680px;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--color-text);
}

.about-body p + p {
  margin-top: 16px;
}

/* ============================================================
   Skills Section
   ============================================================ */
#skills {
  padding: var(--section-padding);
  background-color: var(--color-secondary-bg);
}

.skills-group {
  margin-bottom: 28px;
}

.skills-group:last-child {
  margin-bottom: 0;
}

.skills-group-label {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #5A6A72;
  margin-bottom: 12px;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
}

.tag {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 500;
  line-height: 1;
}

.tag-technical {
  background-color: var(--color-accent);
  color: var(--color-white);
}

.tag-professional {
  background-color: #D1DCE0;
  color: var(--color-text);
}

/* ============================================================
   Projects Section
   ============================================================ */
#projects {
  padding: var(--section-padding);
  background-color: var(--color-bg);
}

.projects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.project-card {
  background-color: var(--color-white);
  border: 1px solid #D1DCE0;
  border-radius: var(--border-radius);
  padding: 28px;
  border-top: 4px solid var(--color-accent);
  transition: box-shadow var(--transition), transform var(--transition);
}

.project-card:hover {
  box-shadow: 0 6px 24px rgba(13, 110, 110, 0.12);
  transform: translateY(-2px);
}

.project-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 10px;
}

.project-tools {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 14px;
  list-style: none;
}

.project-tool-tag {
  background-color: var(--color-secondary-bg);
  color: var(--color-accent-dark);
  padding: 3px 10px;
  border-radius: 50px;
  font-size: 0.78rem;
  font-weight: 600;
}

.project-description {
  font-size: 0.95rem;
  color: #4A5568;
  line-height: 1.65;
}

.project-link {
  display: inline-block;
  margin-top: 16px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition);
}

.project-link:hover,
.project-link:focus {
  border-bottom-color: var(--color-accent);
  text-decoration: none;
}

/* ============================================================
   Contact Section
   ============================================================ */
#contact {
  padding: var(--section-padding);
  background-color: var(--color-secondary-bg);
}

.contact-intro {
  font-size: 1rem;
  margin-bottom: 28px;
  max-width: 520px;
  color: var(--color-text);
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.contact-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--border-radius);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  transition: background-color var(--transition), color var(--transition);
}

.contact-badge:hover,
.contact-badge:focus {
  text-decoration: none;
}

.contact-badge svg {
  flex-shrink: 0;
}

.badge-linkedin {
  background-color: #0A66C2;
  color: var(--color-white);
}

.badge-linkedin:hover,
.badge-linkedin:focus {
  background-color: #084e96;
  color: var(--color-white);
}

.badge-github {
  background-color: #24292E;
  color: var(--color-white);
}

.badge-github:hover,
.badge-github:focus {
  background-color: #0d1117;
  color: var(--color-white);
}

.badge-email {
  background-color: var(--color-accent);
  color: var(--color-white);
}

.badge-email:hover,
.badge-email:focus {
  background-color: var(--color-accent-dark);
  color: var(--color-white);
}

/* ============================================================
   Footer
   ============================================================ */
footer {
  background-color: var(--color-nav-bg);
  color: #8A9BAB;
  text-align: center;
  padding: 24px;
  font-size: 0.85rem;
}

/* ============================================================
   Responsive — Tablet & Desktop (≥ 640px)
   ============================================================ */
@media (min-width: 640px) {
  .hero-inner {
    flex-direction: row;
    text-align: left;
    gap: 36px;
    justify-content: center;
    align-items: center;
  }

  .hero-text h1 {
    font-size: 2.75rem;
  }

  .hero-tagline {
    margin-inline: 0;
  }

  .hero-cta-group {
    justify-content: flex-start;
  }
}

@media (min-width: 700px) {
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ============================================================
   Mobile Nav (< 640px)
   ============================================================ */
@media (max-width: 639px) {
  #nav-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  #nav-links {
    display: none;
    flex-direction: column;
    gap: 0;
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background-color: var(--color-nav-bg);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding: 8px 0 16px;
  }

  #nav-links.open {
    display: flex;
  }

  #nav-links li {
    width: 100%;
  }

  #nav-links a {
    display: block;
    padding: 12px 24px;
    border-bottom: none;
  }
}