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

:root {
  --evergreen:       #04251c;
  --dark-slate-grey: #35463a;
  --porcelain:       #fffdf7;
  --dark-coffee:     #422a24;
  --coffee-bean:     #331F1F;

  --black:   var(--coffee-bean);
  --white:   var(--porcelain);
  --accent:  var(--dark-coffee);
  --gray:    var(--dark-slate-grey);
  --light:   #c4d0c8;

  --font-sans: "Figtree", sans-serif;
  --max-w: 960px;
  --radius: 12px;

  --nav-bg:        rgba(255, 253, 247, 0.88);
  --nav-mobile-bg: rgba(255, 253, 247, 0.97);
  --focus-ring:    rgba(79, 51, 43, 0.25);
}

html {
  scroll-behavior: smooth;
  font-size: 18px;
}

body {
  font-family: var(--font-sans);
  background: var(--white);
  color: var(--black);
  line-height: 1.6;
}

/* ── Typography ── */
h1 { font-size: clamp(3rem, 8vw, 6rem); font-weight: 400; letter-spacing: -0.02em; font-family: "DM Serif Display", serif; }
h2 { font-size: clamp(1.75rem, 4vw, 2.5rem); font-weight: 700; margin-bottom: 1.25rem; }
h3 { font-size: 1.125rem; font-weight: 600; margin-bottom: 0.5rem; }
p  { color: var(--gray); max-width: 60ch; }

/* ── Layout Helpers ── */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1rem;
}

/* ── Nav ── */
header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: var(--nav-bg);
  border-bottom: 1px solid rgba(66, 42, 36, 0.3);
}

nav {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1rem;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  transition: transform 0.2s;
}

.logo:hover { transform: translateY(-2px); }

.logo-img {
  display: block;
  height: 44px;
  width: auto;
  transition: filter 0.3s ease;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 2rem;
}

nav a {
  text-decoration: none;
  color: var(--gray);
  font-size: 1rem;
  transition: color 0.2s;
}

nav a:hover { color: var(--black); font-weight: 700; text-decoration: underline; text-underline-offset: 6px; }

nav a.active { color: var(--black); font-weight: 700; text-decoration: underline; text-underline-offset: 6px; }

/* ── Hero ── */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 0 1rem;
  max-width: var(--max-w);
  margin: 0 auto;
  position: relative;
}

.hero-content { padding-top: 64px; }

@media (max-width: 640px) {
  #hero {
    min-height: auto;
    padding-top: 10rem;
    padding-bottom: 10rem;
  }
  section#about {
    padding: 4rem 0 4rem !important;
  }
  section#research {
    padding: 4rem 0 4rem !important;
  }
  section#beyond {
    padding: 4rem 0 4rem !important;
  }
  section#contact {
    padding: 4rem 0 4rem !important;
  }
  .skills li::after {
    display: none;
  }
}


.scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  color: var(--gray);
  opacity: 0.45;
  animation: scroll-bounce 2s ease-in-out infinite;
  transition: opacity 0.5s ease;
}

.scroll-indicator.hidden {
  opacity: 0;
  pointer-events: none;
}

@keyframes scroll-bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(7px); }
}

.hero-heading {
  display: flex;
  flex-direction: column;
  max-width: none;
}

.eyebrow {
  color: var(--accent);
  font-size: 1.25rem;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.hero-name {
  color: var(--black);
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 400;
  letter-spacing: -0.02em;
  font-family: "DM Serif Display", serif;
}

.tagline {
  font-size: clamp(1rem, 2.5vw, 1.5rem);
  color: var(--gray);
  margin: 0.75rem 0 2rem;
  max-width: none;
}

/* ── Buttons ── */
.btn {
  display: inline-block;
  background: var(--black);
  color: var(--white);
  text-decoration: none;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 500;
  transition: background 0.2s, transform 0.15s;
}

.btn:hover {
  background: var(--accent);
  transform: translateY(-2px);
}

.link {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9rem;
}

.link:hover { text-decoration: underline; }

.btn-porcelain {
  background: var(--porcelain);
  color: var(--evergreen);
}

.btn-porcelain:hover {
  background: var(--light);
  color: var(--evergreen);
}

/* ── Sections ── */
section:not(#hero) {
  padding: 6rem 0;
}

/* ── About ── */
#about { padding-top: 3rem; }

.about-layout {
  display: flex;
  align-items: flex-start;
  gap: 5rem;
  margin-top: 0.5rem;
}

.about-portrait {
  flex: 0 0 220px;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--light);
}

.about-portrait img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  display: block;
  /* placeholder tint when no image is loaded */
  background: var(--light);
}

.about-body {
  flex: 1;
  padding-top: 0.25rem;
}

@media (max-width: 640px) {
  .about-layout {
    flex-direction: column;
    gap: 1.5rem;
  }
  .about-portrait {
    flex: 0 0 auto;
    width: 80%;
    margin: 0 auto;
  }
  .skills {
    justify-content: center;
  }
}

.skills {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.skills li {
  background: var(--light);
  color: var(--black);
  padding: 0.4rem 1rem;
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 500;
  position: relative;
  cursor: default;
}

.skills li::after {
  content: attr(data-tooltip);
  position: absolute;
  top: calc(100% + 10px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--black);
  color: var(--white);
  font-size: 0.8rem;
  font-weight: 400;
  line-height: 1.5;
  padding: 0.6rem 0.875rem;
  border-radius: 8px;
  width: max-content;
  max-width: 220px;
  white-space: normal;
  text-align: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
  z-index: 50;
}

.skills li:hover::after {
  opacity: 1;
}

/* ── Experience Timeline ── */
.experience {
  margin-top: 1.75rem;
}

.experience-heading {
  margin-bottom: 1.25rem;
}

.timeline {
  list-style: none;
  border-left: 2px solid var(--light);
  padding-left: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.timeline-item {
  display: grid;
  grid-template-columns: 10rem 1fr;
  grid-template-rows: auto auto;
  column-gap: 1rem;
  position: relative;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -1.625rem;
  top: 0.45rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--white);
}

.timeline-date {
  grid-column: 1;
  grid-row: 1 / 3;
  font-size: 0.8rem;
  color: var(--gray);
  padding-top: 0.15rem;
}

.timeline-role {
  grid-column: 2;
  grid-row: 1;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--black);
}

.timeline-org {
  grid-column: 2;
  grid-row: 2;
  font-size: 0.875rem;
  color: var(--gray);
}

@media (max-width: 900px) {
  .timeline-item {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto auto;
  }
  .timeline-date {
    grid-column: 1;
    grid-row: 1;
    padding-top: 0;
    margin-bottom: 0.2rem;
  }
  .timeline-role { grid-column: 1; grid-row: 2; }
  .timeline-org  { grid-column: 1; grid-row: 3; }
}

/* ── Research ── */
#research { background: var(--evergreen); }
#research h2 { color: var(--white);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.project-card {
  background: rgba(255, 253, 247, 0.1);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: transform 0.2s;
}

.project-card:hover { transform: translateY(-4px); }

.project-thumb {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: 8px;
  margin-bottom: 1.25rem;
  display: block;
  background: rgba(255, 253, 247, 0.15);
}

.project-card h3 { color: var(--white); }
.project-card p  { color: var(--light); font-size: 0.9rem; margin-bottom: 1rem; }

/* ── Beyond the Desk ── */
#beyond { background: var(--light); }

.photo-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: 1fr 1fr;
  gap: 0.875rem;
  margin-top: 2rem;
}

.photo-item {
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius);
  position: relative;
}

.photo-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  border-radius: var(--radius);
  transition: transform 0.35s ease;
  background: var(--light);
  min-height: 180px;
}

.photo-item:hover img { transform: scale(1.03); }

.photo-item figcaption {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  padding: 0.6rem 0.875rem;
  font-size: 0.8rem;
  color: #fff;
  background: linear-gradient(transparent, rgba(0,0,0,0.5));
  border-radius: 0 0 var(--radius) var(--radius);
  opacity: 0;
  transition: opacity 0.25s;
  max-width: none;
}

.photo-item:hover figcaption { opacity: 1; }

/* Explicit placement: tall in cols 1 & 3, stacked pair in col 2 */
.photo-grid .photo-item:nth-child(1) { grid-column: 1; grid-row: 1 / 3; }
.photo-grid .photo-item:nth-child(2) { grid-column: 2; grid-row: 1; }
.photo-grid .photo-item:nth-child(3) { grid-column: 2; grid-row: 2; }
.photo-grid .photo-item:nth-child(4) { grid-column: 3; grid-row: 1 / 3; }

@media (max-width: 600px) {
  .photo-grid {
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: auto;
  }
  .photo-grid .photo-item:nth-child(1) { grid-column: 1; grid-row: 1 / 3; }
  .photo-grid .photo-item:nth-child(2) { grid-column: 2; grid-row: 1; }
  .photo-grid .photo-item:nth-child(3) { grid-column: 2; grid-row: 2; }
  .photo-grid .photo-item:nth-child(4) { grid-column: 1 / 3; grid-row: 3; }
}

/* ── Contact ── */
#contact .btn { margin-top: 1.5rem; }

.social-links {
  list-style: none;
  display: flex;
  gap: 1.25rem;
  margin-top: 2rem;
  flex-wrap: wrap;
}

.social-links a {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  color: var(--gray);
  text-decoration: none;
  transition: color 0.2s, transform 0.2s;
}

.social-links a:hover {
  color: var(--black);
  transform: translateY(-2px);
}

.social-links svg {
  width: 28px;
  height: 28px;
}

.social-links span {
  font-size: 0.75rem;
  font-weight: 500;
}

/* ── Contact Form ── */
#contact-form {
  margin-top: 1.25rem;
  max-width: 520px;
}

/* hide honeypot */
#contact-form input[name="_gotcha"] {
  display: none;
}

.form-group {
  display: flex;
  flex-direction: column;
  margin-bottom: 0.875rem;
}

.form-group label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--black);
  margin-bottom: 0.3rem;
}

.form-group input,
.form-group textarea {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--black);
  background: var(--white);
  border: 1px solid var(--light);
  border-radius: 8px;
  padding: 0.5rem 0.875rem;
  transition: border-color 0.2s, box-shadow 0.2s;
  resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--focus-ring);
}

.form-group input.invalid,
.form-group textarea.invalid {
  border-color: #ef4444;
}

.field-error {
  font-size: 0.8rem;
  color: #ef4444;
  margin-top: 0.3rem;
  min-height: 1em;
}

#submit-btn {
  margin-top: 0.5rem;
  cursor: pointer;
  border: none;
}

#submit-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.form-status {
  margin-top: 1rem;
  font-size: 0.9rem;
  min-height: 1.4em;
}

.form-status.success { color: #16a34a; }
.form-status.error   { color: #ef4444; }

/* ── Footer ── */
footer {
  border-top: 1px solid var(--light);
  padding: 2rem 1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
}

footer p {
  font-size: 0.85rem;
  color: var(--gray);
  margin: 0 auto;
}

footer .social-links {
  justify-content: center;
  margin-top: 0;
}

/* ── Hamburger ── */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 200;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--black);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
  transform-origin: center;
}

/* Animate to × when open */
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 640px) {
  .nav-toggle { display: flex; }

  .nav-menu {
    position: fixed;
    top: 64px; left: 0; right: 0;
    background: var(--nav-mobile-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    flex-direction: column;
    align-items: center;
    gap: 0;
    padding: 1rem 0 1.5rem;
    border-bottom: 1px solid var(--light);
    /* hidden by default */
    opacity: 0;
    pointer-events: none;
    transform: translateY(-8px);
    transition: opacity 0.25s ease, transform 0.25s ease;
  }

  .nav-menu.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .nav-menu li { width: 100%; text-align: center; }

  .nav-menu a {
    display: block;
    padding: 0.85rem 1.5rem;
    font-size: 1rem;
  }
}

/* ── Nav Right (ul + controls) ── */
.nav-right {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}