/* =============================================================
   James Day — Personal Academic Website
   style.css
   Pure CSS — no build tools, no preprocessors
   ============================================================= */


/* ── 1. Custom Properties ───────────────────────────────────── */

:root {
  --bg:             #f9f7f4;
  --bg-white:       #ffffff;
  --bg-warm:        #f4efe4;
  --text:           #1c1c1c;
  --text-muted:     #555555;
  --text-light:     #909090;
  --border:         #e4e0d8;
  --border-light:   #edeae4;

  --accent:         #2b6d87;
  --accent-hover:   #1f5469;
  --accent-faint:   rgba(43, 109, 135, 0.08);

  --warm:           #9a6342;
  --warm-hover:     #7c4f34;
  --warm-faint:     rgba(154, 99, 66, 0.10);

  --font-serif:     'Lora', Georgia, 'Times New Roman', serif;
  --font-sans:      'Inter', system-ui, -apple-system, BlinkMacSystemFont,
                    'Segoe UI', sans-serif;

  --max-width:      960px;
  --section-v:      5rem;
  --section-h:      1.5rem;

  --radius:         8px;
  --radius-sm:      5px;
  --shadow-sm:      0 1px 4px rgba(0,0,0,0.07);
  --shadow-md:      0 4px 18px rgba(0,0,0,0.09);
  --shadow-photo:   0 10px 36px rgba(0,0,0,0.15), 0 2px 8px rgba(0,0,0,0.08);
  --transition:     0.2s ease;
}


/* ── 2. Reset & Base ────────────────────────────────────────── */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 68px;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

a:hover { color: var(--accent-hover); }

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

h1, h2, h3 {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.2;
  color: var(--text);
}

h1 { font-size: clamp(2rem, 5vw, 2.9rem); }
h2 { font-size: clamp(1.45rem, 3vw, 1.85rem); margin-bottom: 1.5rem; }
h3 { font-size: 1.1rem; margin-bottom: 0.65rem; }

p { margin-bottom: 1rem; }
p:last-child { margin-bottom: 0; }

address { font-style: normal; }
ul { list-style: none; }


/* ── 3. Layout Helpers ──────────────────────────────────────── */

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--section-h);
}

.section {
  padding: var(--section-v) var(--section-h);
  background: var(--bg);
}

.section-white { background: var(--bg-white); }
.section-warm  { background: var(--bg-warm);  }

.prose { max-width: 680px; }
.prose p + p { margin-top: 0.1rem; }


/* ── 4. Navigation ──────────────────────────────────────────── */

.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: rgba(249, 247, 244, 0.97);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-light);
  transition: box-shadow var(--transition);
}

.site-header.scrolled { box-shadow: var(--shadow-sm); }

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--section-h);
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.nav-logo {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
  flex-shrink: 0;
  transition: color var(--transition);
}

.nav-logo:hover { color: var(--accent); }

.nav-menu {
  display: flex;
  align-items: center;
  gap: 0.15rem;
}

.nav-menu a {
  display: block;
  padding: 0.375rem 0.75rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}

.nav-menu a:hover {
  color: var(--accent);
  background: var(--accent-faint);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 7px;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.28s ease, opacity 0.28s ease;
}

.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);
}


/* ── 5. Hero ────────────────────────────────────────────────── */

.hero {
  padding: 5.5rem var(--section-h) 4.5rem;
  background: var(--bg);
}

.hero-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 4rem;
}

.hero-photo { flex-shrink: 0; }

.hero-photo img {
  width: 210px;
  height: 210px;
  border-radius: 50%;
  object-fit: cover;
  object-position: center 15%;
  box-shadow: var(--shadow-photo);
  border: 5px solid var(--bg-white);
}

.hero-text h1 {
  margin-bottom: 0.3rem;
  letter-spacing: -0.01em;
}

.hero-title {
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 0.15rem;
}

.hero-institution {
  font-size: 0.875rem;
  color: var(--text-light);
  margin-bottom: 1.5rem;
}

.hero-institution a {
  color: var(--text-light);
  text-decoration: underline;
  text-decoration-color: var(--border);
  text-underline-offset: 3px;
  transition: color var(--transition), text-decoration-color var(--transition);
}

.hero-institution a:hover {
  color: var(--accent);
  text-decoration-color: var(--accent);
}

.hero-tagline {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.1rem;
  color: var(--text-muted);
  line-height: 1.6;
  max-width: 420px;
  padding-left: 1.1rem;
  border-left: 3px solid var(--border);
  margin-bottom: 0;
}


/* ── 6. Research ────────────────────────────────────────────── */

.research-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.75rem;
}

.research-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  transition: box-shadow var(--transition), transform var(--transition);
}

.research-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.research-card-icon {
  color: var(--accent);
  margin-bottom: 1.1rem;
}

.research-card h3 {
  font-size: 1.05rem;
  margin-bottom: 0.8rem;
}

.research-card p {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.72;
  margin-bottom: 0;
}


/* ── 7. Art + Science ───────────────────────────────────────── */

.art-science-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 3rem;
}

.eyebrow {
  display: block;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--warm);
  margin-bottom: 0.55rem;
}

.warm-heading { color: var(--warm); margin-bottom: 1.25rem; }

.art-science-text a { color: var(--warm); }
.art-science-text a:hover { color: var(--warm-hover); }
.art-science-text a:focus-visible { outline-color: var(--warm); }

.art-science-text p {
  color: var(--text-muted);
  max-width: 580px;
}

.art-science-ornament {
  position: relative;
  width: 110px;
  height: 110px;
  flex-shrink: 0;
}

.orb {
  position: absolute;
  border-radius: 50%;
  animation: floatOrb 7s ease-in-out infinite;
}

.orb-1 {
  width: 80px; height: 80px;
  background: radial-gradient(circle at 35% 35%, rgba(154,99,66,0.22), transparent 70%);
  top: 0; left: 10px;
  animation-duration: 7s;
}

.orb-2 {
  width: 55px; height: 55px;
  background: radial-gradient(circle at 35% 35%, rgba(43,109,135,0.20), transparent 70%);
  bottom: 0; right: 0;
  animation-duration: 9s;
  animation-delay: -3s;
}

.orb-3 {
  width: 40px; height: 40px;
  background: radial-gradient(circle at 35% 35%, rgba(154,99,66,0.14), transparent 70%);
  bottom: 15px; left: 0;
  animation-duration: 11s;
  animation-delay: -6s;
}

@keyframes floatOrb {
  0%, 100% { transform: translateY(0) scale(1); }
  50%       { transform: translateY(-10px) scale(1.06); }
}


/* ── 8. Publications ────────────────────────────────────────── */

.pub-links {
  margin-top: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.pub-link {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background: var(--bg);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 0.95rem;
  transition:
    border-color var(--transition),
    background    var(--transition),
    box-shadow    var(--transition),
    transform     var(--transition);
}

.pub-link:hover {
  border-color: var(--accent);
  background: var(--accent-faint);
  box-shadow: var(--shadow-sm);
  color: var(--text);
  transform: translateX(3px);
}

.pub-link-icon {
  color: var(--accent);
  flex-shrink: 0;
  display: flex;
  align-items: center;
}

.pub-link strong {
  display: block;
  font-size: 0.975rem;
  font-weight: 500;
  color: var(--accent);
}

.pub-link-sub {
  display: block;
  font-size: 0.8rem;
  color: var(--text-light);
  margin-top: 1px;
}

.pub-link-arrow {
  margin-left: auto;
  font-size: 1.1rem;
  color: var(--text-light);
  transition: transform var(--transition), color var(--transition);
}

.pub-link:hover .pub-link-arrow {
  transform: translateX(3px);
  color: var(--accent);
}


/* ── 9. Contact ─────────────────────────────────────────────── */

.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem 3rem;
  margin-top: 0.25rem;
  max-width: 680px;
}

.contact-item-wide { grid-column: 1 / -1; }

.contact-label {
  display: block;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-light);
  margin-bottom: 0.4rem;
}

.contact-value {
  font-size: 1rem;
  color: var(--text);
  line-height: 1.6;
}

.contact-value a { color: var(--accent); }
.contact-value a:hover { color: var(--accent-hover); }


/* ── 10. Footer ─────────────────────────────────────────────── */

.site-footer {
  background: #1a1a1a;
  color: rgba(255, 255, 255, 0.65);
  padding: 2.5rem var(--section-h);
  text-align: center;
}

.site-footer .container {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  align-items: center;
}

.site-footer p { font-size: 0.875rem; margin: 0; }

.site-footer a {
  color: rgba(255, 255, 255, 0.65);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--transition);
}

.site-footer a:hover { color: #fff; }
.site-footer strong { color: rgba(255, 255, 255, 0.85); }
.footer-sub {
  font-size: 0.78rem !important;
  color: rgba(255, 255, 255, 0.35) !important;
}


/* ── 11. Responsive: Tablet (≤ 768 px) ─────────────────────── */

@media (max-width: 768px) {

  :root { --section-v: 3.5rem; }

  .nav-toggle { display: flex; }

  .nav-menu {
    display: none;
    position: absolute;
    top: 64px;
    left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 0.5rem 1.25rem 1.25rem;
    gap: 0;
    box-shadow: 0 8px 24px rgba(0,0,0,0.08);
  }

  .nav-menu.is-open { display: flex; }

  .nav-menu a {
    padding: 0.65rem 0.5rem;
    font-size: 0.95rem;
    border-radius: 0;
    border-bottom: 1px solid var(--border-light);
  }

  .nav-menu li:last-child a { border-bottom: none; }

  .hero { padding: 3.5rem var(--section-h) 3rem; }

  .hero-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 2rem;
  }

  .hero-photo img { width: 160px; height: 160px; }

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

  .art-science-inner { grid-template-columns: 1fr; }
  .art-science-ornament { display: none; }

  .contact-grid { grid-template-columns: 1fr; gap: 1.5rem; }
  .contact-item-wide { grid-column: 1; }
}


/* ── 12. Responsive: Mobile (≤ 480 px) ─────────────────────── */

@media (max-width: 480px) {

  :root {
    --section-v: 2.75rem;
    --section-h: 1.1rem;
  }

  .hero { padding: 2.75rem var(--section-h) 2.5rem; }
  .hero-photo img { width: 130px; height: 130px; }
  .hero-tagline { font-size: 1rem; max-width: 100%; }
  .research-card { padding: 1.5rem; }
  .pub-link { padding: 0.875rem 1rem; }
  .pub-link-arrow { display: none; }
}


/* ── 13. Reduced Motion ─────────────────────────────────────── */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}


/* ── 14. Print ──────────────────────────────────────────────── */

@media print {
  .site-header, .nav-toggle, .art-science-ornament { display: none !important; }
  html { scroll-padding-top: 0; }
  .hero { padding: 1.5rem 0; }
  .section { padding: 1.5rem 0; background: none !important; }
  .research-card, .pub-link { box-shadow: none; border: 1px solid #ccc; }
  a[href]::after { content: " (" attr(href) ")"; font-size: 0.8em; color: #555; }
  .nav-logo::after, .pub-link-arrow::after { content: none !important; }
}