/* ============================================================
   Personal Portfolio — Richard Van
   Single shared stylesheet; no build step, no dependencies.
   ============================================================ */

/* ------------------------------------------------------------
   1. DESIGN TOKENS
   ------------------------------------------------------------ */
:root {
  --color-navy-900: #1b2a41;
  --color-navy-700: #2f4256;
  --color-burgundy-600: #7a2e3a;
  --color-burgundy-700: #5e232c;
  --color-silver-100: #f4f4f2;
  --color-silver-300: #e2e1dd;
  --color-silver-500: #b9b8b3;
  --color-white: #ffffff;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
  --font-serif: Georgia, "Times New Roman", serif;

  --max-width: 800px;
  --nav-breakpoint: 600px;
}

/* ------------------------------------------------------------
   2. CSS RESET
   ------------------------------------------------------------ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

/* ------------------------------------------------------------
   3. BASE TYPOGRAPHY & ELEMENTS
   ------------------------------------------------------------ */
body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-navy-900);
  background-color: var(--color-silver-100);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-serif);
  color: var(--color-navy-900);
  line-height: 1.25;
}

h1 {
  font-size: 1.75rem;
  margin-bottom: 1rem;
}

h2 {
  font-size: 1.375rem;
  margin-bottom: 0.75rem;
}

h3 {
  font-size: 1.125rem;
  margin-bottom: 0.5rem;
}

p {
  margin-bottom: 1rem;
}

a {
  color: var(--color-burgundy-600);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover,
a:focus-visible {
  color: var(--color-burgundy-700);
  text-decoration: underline;
}

a:focus-visible {
  outline: 2px solid var(--color-burgundy-600);
  outline-offset: 2px;
  border-radius: 2px;
}

/* ------------------------------------------------------------
   4. LAYOUT
   ------------------------------------------------------------ */
.site-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ------------------------------------------------------------
   5. HEADER
   ------------------------------------------------------------ */
.site-header {
  border-bottom: 1px solid var(--color-silver-300);
  padding: 1.5rem 0;
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
}

.site-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-navy-900);
  text-decoration: none;
}

.site-title:hover {
  color: var(--color-navy-900);
  text-decoration: none;
}

.site-tagline {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--color-navy-700);
  margin-top: 0.1rem;
}

/* -- Navigation -- */
.nav-toggle {
  display: none;
}

.nav-toggle-label {
  display: none;
  cursor: pointer;
  width: 28px;
  height: 20px;
  position: relative;
  align-self: center;
}

.nav-toggle-label span,
.nav-toggle-label span::before,
.nav-toggle-label span::after {
  display: block;
  background-color: var(--color-navy-900);
  height: 2px;
  width: 100%;
  border-radius: 1px;
  position: absolute;
  left: 0;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle-label span {
  top: 9px;
}

.nav-toggle-label span::before {
  content: "";
  top: -8px;
}

.nav-toggle-label span::after {
  content: "";
  top: 8px;
}

/* Hamburger → X animation when checked */
.nav-toggle:checked + .nav-toggle-label span {
  background-color: transparent;
}

.nav-toggle:checked + .nav-toggle-label span::before {
  top: 0;
  transform: rotate(45deg);
}

.nav-toggle:checked + .nav-toggle-label span::after {
  top: 0;
  transform: rotate(-45deg);
}

.site-nav ul {
  list-style: none;
  display: flex;
  gap: 1.5rem;
}

.site-nav a {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--color-navy-700);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 2px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--color-burgundy-600);
  border-bottom-color: var(--color-burgundy-600);
  text-decoration: none;
}

.site-nav a.current {
  color: var(--color-navy-900);
  border-bottom-color: var(--color-navy-900);
}

/* ------------------------------------------------------------
   6. MAIN CONTENT
   ------------------------------------------------------------ */
main {
  padding: 2.5rem 0;
}

/* ------------------------------------------------------------
   7. FOOTER
   ------------------------------------------------------------ */
.site-footer {
  border-top: 1px solid var(--color-silver-300);
  padding: 1.5rem 0;
  margin-top: 2rem;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  text-align: center;
}

.social-links {
  list-style: none;
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
}

.social-links a {
  font-size: 0.9rem;
  color: var(--color-navy-700);
}

.social-links a:hover {
  color: var(--color-burgundy-600);
}

.copyright {
  font-size: 0.8rem;
  color: var(--color-silver-500);
  margin-bottom: 0;
}

/* ------------------------------------------------------------
   8. COMPONENTS
   ------------------------------------------------------------ */

/* Card */
.card {
  background-color: var(--color-white);
  border: 1px solid var(--color-silver-300);
  border-radius: 4px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.card p:last-child {
  margin-bottom: 0;
}

/* Stack category (tech-stack.html) */
.stack-category {
  margin-bottom: 2rem;
}

.stack-category dl {
  background-color: var(--color-white);
  border: 1px solid var(--color-silver-300);
  border-radius: 4px;
  padding: 0;
}

.stack-category dt {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-navy-900);
  padding: 0.75rem 1.25rem 0.25rem 1.25rem;
}

.stack-category dt:first-of-type {
  padding-top: 1rem;
}

.stack-category dd {
  font-size: 0.9rem;
  color: var(--color-navy-700);
  padding: 0.25rem 1.25rem 0.75rem 1.25rem;
  margin: 0;
}

.stack-category dd:last-of-type {
  padding-bottom: 1rem;
}

.stack-category dd + dt {
  border-top: 1px solid var(--color-silver-300);
}

/* Placeholder note styling */
.placeholder-note,
.page-note {
  font-size: 0.85rem;
  font-style: italic;
  color: var(--color-silver-500);
  margin-bottom: 1.5rem;
}

/* Home page — headshot */
.headshot {
  width: 220px;
  height: 220px;
  border-radius: 50%;
  object-fit: cover;
  object-position: center 0%;
  border: 3px solid var(--color-silver-300);
  background-color: var(--color-silver-300);
  flex-shrink: 0;
}

/* Home page — intro section */
.intro-section {
  margin-bottom: 2rem;
}

.intro-layout {
  display: flex;
  align-items: center;
  gap: 2.5rem;
  margin-bottom: 2rem;
}

.intro-buttons {
  display: flex;
  gap: 1.25rem;
}

.text-btn {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-navy-900);
  text-decoration: none;
  padding: 0.5rem 0;
  border-bottom: 2px solid var(--color-silver-300);
  transition: border-color 0.15s ease, color 0.15s ease;
}

.text-btn:hover,
.text-btn:focus-visible {
  color: var(--color-burgundy-600);
  border-bottom-color: var(--color-burgundy-600);
  text-decoration: none;
}

.text-btn:focus-visible {
  outline: 2px solid var(--color-burgundy-600);
  outline-offset: 4px;
  border-radius: 2px;
}

.intro-section .name-heading {
  margin-bottom: 0.25rem;
}

.intro-section .role {
  font-family: var(--font-sans);
  font-size: 1rem;
  color: var(--color-navy-700);
  margin-bottom: 1.25rem;
}

.bio {
  font-size: 0.95rem;
  color: var(--color-navy-700);
}

/* Home page — contact links */
.contact-links {
  list-style: none;
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
  margin-top: 1.5rem;
}

.contact-links a {
  font-size: 0.9rem;
}

/* Project cards (ai-projects.html) */
.project-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-silver-300);
  border-radius: 4px;
  padding: 1.25rem;
  margin-bottom: 1.25rem;
}

.project-card h3 {
  margin-bottom: 0.5rem;
}

.project-card p {
  font-size: 0.9rem;
  color: var(--color-navy-700);
  margin-bottom: 0.75rem;
}

.project-card > a {
  font-size: 0.85rem;
}

.project-gif {
  width: 100%;
  max-width: 600px;
  height: auto;
  border-radius: 4px;
  border: 1px solid var(--color-silver-300);
  margin-bottom: 0.75rem;
}

.tags {
  list-style: none;
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 0.5rem;
}

.tags li {
  font-size: 0.75rem;
  color: var(--color-navy-700);
  background-color: var(--color-silver-300);
  padding: 0.15rem 0.5rem;
  border-radius: 3px;
}

/* ------------------------------------------------------------
   9. RESPONSIVE
   ------------------------------------------------------------ */
@media (max-width: 600px) {
  .header-inner {
    flex-wrap: wrap;
  }

  /* Show the hamburger toggle */
  .nav-toggle-label {
    display: block;
  }

  /* Hide nav by default on mobile */
  .site-nav {
    display: none;
    width: 100%;
    margin-top: 1rem;
  }

  /* Show nav when checkbox is checked */
  .nav-toggle:checked ~ .site-nav {
    display: block;
  }

  .site-nav ul {
    flex-direction: column;
    gap: 0.5rem;
  }

  .site-nav a {
    display: block;
    padding: 0.5rem 0;
    border-bottom: none;
  }

  .site-nav a.current {
    border-bottom: none;
    font-weight: 600;
  }

  main {
    padding: 2rem 0;
  }

  .headshot {
    width: 180px;
    height: 180px;
  }

  .intro-layout {
    flex-direction: column;
    align-items: flex-start;
    gap: 1.25rem;
  }

  .intro-buttons {
    margin-left: 0;
  }

  .contact-links {
    flex-direction: column;
    gap: 0.5rem;
  }

  .social-links {
    gap: 1rem;
  }
}

@media (min-width: 601px) {
  /* Ensure nav is always visible on desktop regardless of toggle state */
  .site-nav {
    display: block !important;
  }
}