* {
  box-sizing: border-box;
}

/* BASE */
html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Inter, Arial, sans-serif;
  line-height: 1.6;
  background: var(--bg);
  color: var(--fg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* THEME VARIABLES */
:root {
  --bg: #f3f6fa;
  --fg: #0f172a;
  --muted: #475569;
  --card: #ffffff;
  --border: #cbd5e1;
  --primary: #475569;
  --accent: #10b981;
  --btn-fg: #ffffff;
}

html[data-theme="dark"] {
  --bg: #1b2431;
  --fg: #f1f5f9;
  --muted: #a7b2c2;
  --card: #111a24;
  --border: #334155;
  --primary: #64748b;
  --accent: #10b981;
  --btn-fg: #ffffff;
}

/* TYPOGRAPHY */
p,
li,
.section__text__p1,
.section__text__p2,
.about-text,
.about-list,
.project-blurb,
.about-tech-line {
  color: var(--muted);
}

h1,
h2,
h3,
.title,
.experience-sub-title,
.project-title {
  color: var(--fg);
}

/* NAV */
#desktop-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--card);
  border-bottom: 0.1rem solid var(--border);
  backdrop-filter: saturate(120%) blur(4px);
  padding: 1rem 1.25rem;

  display: flex;
  align-items: center;
  justify-content: center; /* center the nav links */
}

/* nav links wrapper */
.nav-links {
  list-style: none;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 2.5rem;
  margin: 0;
  padding: 0;
  transform: translateX(1.5rem);
}

/* links */
.nav-links a {
  text-decoration: none;
  color: var(--fg);
  font-size: calc(1rem + 0.25rem);
  font-weight: 500;
  transition: color 200ms ease, text-decoration 200ms ease;
}

.nav-links a:hover {
  color: var(--primary);
  text-decoration: underline;
  text-decoration-color: var(--accent);
}

/* dark mode toggle pinned right */
.theme-toggle {
  position: absolute;
  right: 1.25rem;
  border: 0.1rem solid var(--border);
  padding: 0.5rem 0.8rem;
  border-radius: 9999px;
  background: transparent;
  color: var(--fg);
  cursor: pointer;
  transition: transform 200ms ease, box-shadow 200ms ease, background 200ms ease;
}

.theme-toggle:hover {
  box-shadow: 0 0 0.5rem 0 var(--accent);
  transform: translateY(-1px);
}

@media (max-width: 640px) {
  .theme-toggle {
    position: fixed;
    right: 16px;
    bottom: 16px;
    z-index: 60;
    background: var(--card);
  }
}

/* LAYOUT */
main {
  flex: 1 0 auto;
}

.section-container {
  padding: 4rem 1.25rem;
  max-width: 1100px;
  margin: 0 auto;
}

.section__pic-container {
  display: flex;
  justify-content: center;
  align-items: center;
}

.profile-pic {
  width: 250px;
  height: 250px;
  border-radius: 50%;
  object-fit: cover;
  object-position: center 90%;
  border: 0.15rem solid var(--border);
}

.section__text {
  text-align: center;
  margin-top: 1rem;
}

.section__text__p1 {
  margin: 0.25rem 0;
}

.section__text__p2 {
  margin: 0.25rem 0;
}

.title {
  font-size: 2.25rem;
  margin: 0.25rem 0 0.5rem;
}

/* SOCIALS */
#socials-container {
  display: flex;
  gap: 0.6rem;
  justify-content: center;
  align-items: center;
  margin-top: 0.95rem;
}

.icon {
  width: 32px;
  height: 32px;
  cursor: pointer;
  transition: filter 200ms ease, transform 200ms ease;
}

html[data-theme="dark"] #socials-container .icon {
  filter: invert(92%) brightness(110%) contrast(90%);
}

.icon:hover {
  transform: translateY(-1px);
}

/* BUTTONS */
.btn-container {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  padding: 0.7rem 1.2rem;
  border-radius: 0.9rem;
  border: 0.1rem solid var(--primary);
  cursor: pointer;
  background: transparent;
  color: var(--fg);
  transition:
    box-shadow 200ms ease,
    transform 200ms ease,
    background 200ms ease,
    color 200ms ease,
    border 200ms ease;
  line-height: 1.2;
  white-space: nowrap;
}

.btn:hover {
  box-shadow: 0 0 0.45rem 0 var(--accent);
  transform: translateY(-1px);
}

.btn-soft {
  border-color: var(--border);
  background: var(--card);
  color: var(--fg);
}

.btn-soft:hover {
  background: var(--primary);
  color: var(--btn-fg);
  border-color: var(--primary);
}

.btn-color-1,
.btn-color-2:hover {
  background: var(--primary);
  color: var(--btn-fg);
  border-color: var(--primary);
}

.btn-color-1:hover {
  background: #3b475b;
}

.btn-color-2 {
  border-color: var(--border);
}

.btn-hero {
  min-width: 9rem;
}

/* ABOUT / PROJECTS */
.about-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.about-text,
.about-list,
.about-tech-line {
  text-align: center;
}

.about-list {
  list-style: disc inside;
  margin: 0.25rem auto;
  padding: 0;
  max-width: 800px;
}

.about-tech-line {
  margin-top: 0.25rem;
  max-width: 950px;
  margin-left: auto;
  margin-right: auto;
}

.about-wide {
  grid-column: 1 / -1;
}

.experience-sub-title {
  text-align: center;
  font-weight: 700;
  letter-spacing: 0.2px;
  margin: 0.25rem 0 0.6rem;
  position: relative;
}

.experience-sub-title::after {
  content: "";
  display: block;
  width: 48px;
  height: 3px;
  background: var(--accent);
  border-radius: 9999px;
  margin: 0.45rem auto 0;
}

.about-containers {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}

.details-container {
  display: flex;
  flex-direction: column;
  padding: 1rem;
  border-radius: 1rem;
  background: var(--card);
  border: 0.1rem solid var(--border);
}

.article-container {
  display: flex;
  justify-content: center;
}

.project-img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  border-radius: 0.75rem;
  background: var(--bg);
  border: 0.1rem solid var(--border);
}

.project-title {
  font-weight: 700;
  text-align: center;
}

.project-blurb {
  text-align: center;
  margin: 0 0.75rem 0.75rem;
}

.btn-row {
  margin-top: auto;
  display: grid;
  gap: 0.75rem;
  grid-template-columns: 1fr 1fr;
}

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

.input,
.textarea {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  background: var(--bg);
  color: var(--fg);
}

/* CONTACT */
#contact {
  padding-bottom: 2rem;
}

@media (max-width: 640px) {
  #contact {
    padding-bottom: 2.25rem;
  }
}

/* FOOTER */
footer {
  text-align: center;
  padding: 0.6rem 1rem;
  color: var(--muted);
  border-top: 0.1rem solid var(--border);
  background: var(--bg);
  margin-top: auto;
}

footer p {
  margin: 0;
}

/* RESPONSIVE GRIDS */
@media (max-width: 1024px) {
  .about-containers {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 800px) {
  .about-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .about-containers {
    grid-template-columns: 1fr;
  }
}