:root {
  --tea-green: #c5efcbff;
  --black: #020402ff;
  --carbon: #191919;
  --coal: #202023;
  --dusty-olive: #758173ff;
  --celadon: #a9c5a0ff;
  --tea-green-2: #c6dec6ff;
  --corners: 24px 24px;
  --corners-sm: 10px 10px;
  --base-font-size: 1rem;
  --nav-offset: 64px;
  --ld-bkgr: light-dark(var(--tea-green-2), var(--carbon));
  --ld-text: light-dark(var(--coal), var(--tea-green-2));
  --ld-project-bkgr: light-dark(var(--celadon), #2a3a28ff);
  --ld-techstack-bkgr: light-dark(var(--tea-green), var(--black));
  --ld-techstack-text: light-dark(var(--coal), var(--tea-green-2));
  --ld-icons: light-dark(var(--coal), var(--tea-green-2));
}

html {
  box-sizing: border-box;
  color-scheme: light dark;
  scroll-behavior: smooth;
}
*,
*::before,
*::after{
  box-sizing: inherit;
}


body {
  font-size: var(--base-font-size);
  font-family: "Inter", sans-serif;
  background-color: var(--ld-bkgr);
  color: var(--ld-text);
}

.wrapper {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem;
}

h1 {
  margin: 0;
  font-size: calc(var(--base-font-size) * 2.9);
}

h2 {
  margin: 0;
  font-size: var(--base-font-size);
  text-transform: uppercase;
  color: var(--ld-text);
  letter-spacing: 0.25em;
  display: inline-block;
  position: relative;
  padding-bottom: 0.4rem;
}

h2::after {
  content: "";
  display: block;
  width: 100%;
  height: 3px;
  margin-top: 0.4rem;
  background: color-mix(in oklab, var(--ld-text) 70%, transparent);
  border-radius: 999px;
}

.no-underline::after {
  display: none;
}

h3 {
  margin: 0;
}

p {
  line-height: 1.5;
}

a {
  color: var(--ld-text)
}

a:hover {
  color: var(--ld-text)
}



/* make sure images don't exceed the width of the window */
img {
  max-width: 100%;
  border-radius: var(--corners);
}

/* svg social icon bar */
.icons {
  list-style-type: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-flow: row wrap;
  justify-content: center;
  gap: 2rem;
}

ul svg {
  width: 36px;
  height: 36px;
}

.social {
  fill: var(--ld-text);
}

/* .social:hover {
  fill: var(--white)
} */

/* About me layout styling */
.main-article {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  text-align: center;
}

.main-article img {
  margin: 0 auto;
  object-fit: cover;
  object-position: top;
  height: 250px;
  width: 300px;
  overflow: hidden;
}

/* footer styling */
footer {
  text-align: center;
}

.footer-text-box ul {
  font-size: calc(var(--base-font-size) * 0.85);
  list-style-type: none;
  margin: 0;
  padding: 0;
}

.footer-text {
  line-height: 1.5;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.footer-text-box li {
  line-height: 2;
}

.h2-footer {
  margin: 2rem 0;
}

.contact-title {
  text-align: center;
  display: inline-block;
}

/* projects section */
main {
  margin-top: 5rem;
  margin-bottom: 3rem;
  text-align: center;
}
/* Offset anchor scroll for sticky nav */
#about,
#projects,
#certificates,
#contact {
  scroll-margin-top: var(--nav-offset);
}

main > h2 {
  margin-bottom: 2rem;
}

.project {
  background-color: var(--ld-project-bkgr); 
  padding: 3rem;
  border-radius: var(--corners);
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  color: var(--ld-text);
}

.projects {
  display: flex;
  flex-flow: column nowrap;
  gap: 3rem;
}

.project ul {
  margin: 0;
  padding: 0;
  list-style-type: none;
  display: flex;
  flex-flow: row wrap;
  justify-content: center;
  gap: 1rem;
  font-size: calc(var(--base-font-size) * 0.85);
  margin-bottom: 1.5rem;
}

.project-btn {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.65rem 1.25rem;
  background-color: color-mix(in oklab, var(--ld-text) 85%, transparent);
  color: var(--ld-project-bkgr);
  border: 1px solid var(--ld-text);
  border-radius: var(--corners-sm);
  text-decoration: none;
  font-weight: 500;
  font-size: calc(var(--base-font-size) * 0.9);
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease, transform 0.15s ease;
}

.project-btn:hover {
  background-color: var(--ld-text);
  color: var(--ld-project-bkgr);
  transform: translateY(-2px);
}

.project-btn i {
  margin-left: 0.5rem;
  font-size: 0.85em;
}

.project li {
  background-color: var(--ld-techstack-bkgr);
  color: var(--ld-techstack-text);
  padding: 0.5rem;
  border-radius: var(--corners-sm);
}

/* Certifications Section */
.certificates-section {
  margin: 5rem 0 3rem 0;
  text-align: left;
}

.certificates-section h2 {
  margin-bottom: 3rem;
  text-align: left;
}

.certificates-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 2rem;
}

.certificate-card {
  background-color: color-mix(in oklab, var(--ld-project-bkgr) 40%, transparent);
  border: 1px solid color-mix(in oklab, var(--ld-text) 15%, transparent);
  padding: 2rem;
  border-radius: var(--corners);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  text-decoration: none;
  transition: transform 0.2s ease, background-color 0.2s ease;
}

.certificate-card:hover {
  transform: translateY(-4px);
  background-color: color-mix(in oklab, var(--ld-project-bkgr) 60%, transparent);
  text-decoration: none;
}

.cert-badge {
  width: 150px;
  height: 150px;
  border-radius: var(--corners-sm);
  object-fit: cover;
  margin-bottom: 1rem;
}

.certificate-card h3 {
  margin: 1rem 0 0.5rem 0;
  color: var(--ld-text);
}

.cert-date {
  font-size: calc(var(--base-font-size) * 0.85);
  opacity: 0.8;
  margin: 0.5rem 0 0 0;
}

.project img {
  grid-row: 1/2;
}

.img-border {
  border: 1px solid var(--carbon);
}

/* Theme overrides via data-theme (manual toggle) */
[data-theme="light"] {
  color-scheme: light;
  --ld-bkgr: var(--tea-green-2);
  --ld-text: var(--coal);
  --ld-project-bkgr: var(--celadon);
  --ld-techstack-bkgr: var(--tea-green);
  --ld-techstack-text: var(--coal);
  --ld-icons: var(--coal);
}

[data-theme="dark"] {
  color-scheme: dark;
  --ld-bkgr: var(--carbon);
  --ld-text: var(--tea-green-2);
  --ld-project-bkgr: #2a3a28ff;
  --ld-techstack-bkgr: var(--black);
  --ld-techstack-text: var(--tea-green-2);
  --ld-icons: var(--tea-green-2);
}

/* Theme toggle button */
.theme-toggle {
  position: relative;
  --toggle-w: 56px;
  --toggle-h: 28px;
  --knob: 22px;
  --pad: 3px;
  --nudge-y: -1px;;
  width: var(--toggle-w);
  height: var(--toggle-h);
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 6px;
  border: 1px solid var(--ld-text);
  background-color: color-mix(in oklab, var(--ld-bkgr) 70%, transparent);
  color: var(--ld-text);
  border-radius: 9999px;
  cursor: pointer;
  transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
.theme-toggle .icon {
  font-size: 0.9rem;
  line-height: 1;
}
.theme-toggle .icon i {
  color: inherit;
  display: inline-block;
}
/* Emphasize the active icon by theme */
.theme-toggle .icon { opacity: 0.6; transition: opacity 0.2s ease; }
.theme-toggle[aria-checked="false"] .sun { opacity: 1; }
.theme-toggle[aria-checked="true"] .moon { opacity: 1; }
.theme-toggle .knob {
  position: absolute;
  width: var(--knob);
  height: var(--knob);
  border-radius: 50%;
  background-color: var(--ld-text);
  transform: translateX(0);
  left: var(--pad);
  top: calc((var(--toggle-h) - var(--knob)) / 2 + var(--nudge-y));
  transition: transform 0.25s ease, background-color 0.2s ease;
}
.theme-toggle[aria-checked="true"] .knob {
  transform: translateX(calc(var(--toggle-w) - var(--knob) - var(--pad) - var(--pad)));
}
.theme-toggle:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--ld-text) 30%, transparent);
}

/* Smooth color transitions for theme switch */
html, body, .project, .project li, .img-border, .social, .theme-toggle, .theme-toggle .knob {
  transition: background-color 0.25s ease, color 0.25s ease, fill 0.25s ease, border-color 0.25s ease;
}

/* Top navigation */
.topnav {
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background-color: color-mix(in oklab, var(--ld-project-bkgr) 8%, transparent);
}
.topnav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.5rem 1rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}
.topnav .brand {
  font-weight: 600;
  color: var(--ld-text);
  text-decoration: none;
  white-space: nowrap;
}
.topnav .nav-links {
  list-style: none;
  display: flex;
  gap: 1rem;
  margin: 0;
  padding: 0;
  flex: 1;
}
.topnav .nav-links a {
  color: var(--ld-text);
  text-decoration: none;
  font-size: calc(var(--base-font-size) * 0.95);
  opacity: 0.9;
}
.topnav .nav-links a:hover {
  opacity: 1;
  text-decoration: underline;
}
.topnav .theme-toggle {
  flex-shrink: 0;
}

/* Mobile nav hamburger */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--ld-text);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0;
  width: 2rem;
  height: 2rem;
  align-items: center;
  justify-content: center;
}

/* Mobile responsive */
@media (max-width: 600px) {
  .topnav-inner {
    padding: 0.5rem 0.75rem;
  }
  
  .topnav .brand {
    font-size: calc(var(--base-font-size) * 0.9);
  }
  
  .nav-toggle {
    display: flex;
  }
  
  .topnav .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background-color: color-mix(in oklab, var(--ld-bkgr) 95%, transparent);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }
  
  .topnav .nav-links.active {
    max-height: 200px;
  }
  
  .topnav .nav-links a {
    display: block;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid color-mix(in oklab, var(--ld-text) 10%, transparent);
  }
  
  .topnav .theme-toggle {
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
  }

  .certificates-section,
  .certificates-section h2 {
    text-align: center;
  }

  /* Larger offset on mobile if nav wraps */
  :root {
    --nav-offset: 80px;
  }
}

@media(min-width: 750px) {
  :root {
    --base-font-size: 1.125rem;
  }
  h1 {
    margin-left: -1px;
  }
  .wrapper {
    padding: 5rem;
  }
  .main-article {
    grid-template-columns: 1fr 1fr;
    align-items: center;
    text-align: left;
  }

  .main-article img {
    max-height: 400px;
    margin: 0 0 0 auto;
    object-fit: cover;
    object-position: center;
    height: auto;
    width: auto;
    overflow: auto;
  }
  .icon {
    justify-content: flex-start;
  }

  footer {
    text-align: left;
  }
  .footer-text {
    grid-template-columns: repeat(3, 1fr);
  }

  .footer-text .icons {
    grid-column: 1/4;
  }

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

@media (min-width: 850px) {
  main {
    text-align: left;
  }
  .project {
    grid-template-columns: 1fr 1fr;
  }
  .project img {
    grid-row: auto;
  }
  .project ul {
    justify-content: flex-start;
  }
}