/* ==========================================================================
   Main Stylesheet - Thomas H. Costello
   ========================================================================== */

@import url('variables.css');
@import url('animations.css');

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&family=Spectral:ital,wght@0,400;0,500;0,600;1,400;1,500&display=swap');

/* ==========================================================================
   Reset & Base
   ========================================================================== */

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
}

/* Selection */
::selection {
  background-color: var(--color-highlight);
  color: var(--color-text);
}

/* ==========================================================================
   Typography
   ========================================================================== */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 500;
  line-height: var(--leading-tight);
  color: var(--color-text);
}

h1 {
  font-size: var(--text-4xl);
  letter-spacing: var(--tracking-tight);
}

h2 {
  font-size: var(--text-3xl);
  letter-spacing: var(--tracking-tight);
}

h3 {
  font-size: var(--text-2xl);
}

h4 {
  font-size: var(--text-xl);
}

h5 {
  font-size: var(--text-lg);
}

h6 {
  font-size: var(--text-base);
  font-weight: 600;
}

p {
  margin-bottom: var(--space-4);
}

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

/* Links */
a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* Focus styles for keyboard navigation */
a:focus,
button:focus,
input:focus,
select:focus,
textarea:focus,
[tabindex]:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Focus-visible for better UX (only show on keyboard nav) */
a:focus:not(:focus-visible),
button:focus:not(:focus-visible) {
  outline: none;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Skip to content link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-accent);
  color: white;
  padding: var(--space-2) var(--space-4);
  z-index: 1000;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 0;
}

/* Animated underline for text links */
.link-underline {
  position: relative;
  display: inline;
}

.link-underline::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 1px;
  background-color: var(--color-accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition-base);
}

.link-underline:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* Drop cap for opening paragraphs */
.drop-cap::first-letter {
  float: left;
  font-family: var(--font-serif);
  font-size: 3.5em;
  line-height: 0.8;
  padding-right: 0.1em;
  color: var(--color-accent);
  font-weight: 500;
}

/* Pull quotes / Epigraphs */
.epigraph {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: var(--text-lg);
  color: var(--color-text-light);
  border-left: 2px solid var(--color-accent-light);
  padding-left: var(--space-6);
  margin: var(--space-8) 0;
  max-width: 600px;
}

.epigraph cite {
  display: block;
  font-style: normal;
  font-size: var(--text-sm);
  color: var(--color-muted);
  margin-top: var(--space-2);
}

.epigraph cite::before {
  content: '— ';
}

/* Small caps */
.small-caps {
  font-variant: small-caps;
  letter-spacing: var(--tracking-wide);
}

/* ==========================================================================
   Layout
   ========================================================================== */

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.container--narrow {
  max-width: var(--max-width-narrow);
}

.container--wide {
  max-width: var(--max-width-wide);
}

.section {
  padding: var(--space-16) 0;
}

.section--lg {
  padding: var(--space-24) 0;
}

/* ==========================================================================
   Navigation
   ========================================================================== */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-fixed);
  padding: var(--space-4) 0;
  background-color: rgba(250, 248, 245, 0.9);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: all var(--transition-base);
}

.nav--scrolled {
  padding: var(--space-3) 0;
  box-shadow: var(--shadow-sm);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo {
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: var(--tracking-tight);
}

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

.nav__links {
  display: flex;
  gap: var(--space-8);
  list-style: none;
}

.nav__link {
  font-size: var(--text-sm);
  font-weight: 400;
  color: var(--color-text-light);
  text-decoration: none;
  letter-spacing: var(--tracking-wide);
  text-transform: lowercase;
  transition: color var(--transition-fast);
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 1px;
  background-color: var(--color-accent);
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.nav__link:hover,
.nav__link--active {
  color: var(--color-accent);
}

.nav__link:hover::after,
.nav__link--active::after {
  transform: scaleX(1);
}

/* Mobile menu */
.nav__toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
}

.nav__toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  margin: 5px 0;
  transition: var(--transition-fast);
}

@media (max-width: 768px) {
  .nav__toggle {
    display: block;
  }

  .nav__links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 100%;
    height: 100vh;
    background-color: var(--color-bg);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--space-8);
    transition: right var(--transition-slow);
  }

  .nav__links--open {
    right: 0;
  }

  .nav__link {
    font-size: var(--text-xl);
  }
}

/* ==========================================================================
   Hero
   ========================================================================== */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--space-20);
  position: relative;
  overflow: hidden;
}

.hero__content {
  position: relative;
  z-index: 2;
}

.hero__greeting {
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  font-style: italic;
  color: var(--color-muted);
  margin-bottom: var(--space-4);
  opacity: 0;
  animation: fadeInUp 0.8s ease forwards;
  animation-delay: 0.2s;
}

.hero__title {
  font-size: var(--text-5xl);
  margin-bottom: var(--space-6);
  opacity: 0;
  animation: fadeInUp 0.8s ease forwards;
  animation-delay: 0.4s;
}

.hero__subtitle {
  font-size: var(--text-xl);
  color: var(--color-text-light);
  max-width: 600px;
  margin-bottom: var(--space-8);
  opacity: 0;
  animation: fadeInUp 0.8s ease forwards;
  animation-delay: 0.6s;
}

.hero__cta {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeInUp 0.8s ease forwards;
  animation-delay: 0.8s;
}

/* Decorative elements */
.hero__decoration {
  position: absolute;
  top: 50%;
  right: 5%;
  transform: translateY(-50%);
  width: 400px;
  height: 400px;
  opacity: 0.07;
  z-index: 1;
}

.hero__decoration svg {
  width: 100%;
  height: 100%;
}

/* Floating shapes */
.hero__shapes {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  overflow: hidden;
}

.hero__shape {
  position: absolute;
  border-radius: 50%;
  opacity: 0.03;
}

.hero__shape--1 {
  width: 600px;
  height: 600px;
  background: var(--color-accent);
  top: -200px;
  right: -200px;
  animation: float 20s ease-in-out infinite;
}

.hero__shape--2 {
  width: 400px;
  height: 400px;
  background: var(--color-gold);
  bottom: -100px;
  left: -100px;
  animation: float 25s ease-in-out infinite reverse;
}

.hero__shape--3 {
  width: 200px;
  height: 200px;
  background: var(--color-accent-light);
  top: 30%;
  left: 60%;
  animation: float 15s ease-in-out infinite;
  animation-delay: -5s;
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: var(--tracking-wide);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  cursor: pointer;
  border: none;
}

.btn--primary {
  background-color: var(--color-accent);
  color: white;
}

.btn--primary:hover {
  background-color: var(--color-accent-hover);
  color: white;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn--secondary {
  background-color: transparent;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
}

.btn--secondary:hover {
  background-color: var(--color-accent);
  color: white;
}

.btn--ghost {
  background-color: transparent;
  color: var(--color-text);
  padding: var(--space-2) 0;
}

.btn--ghost:hover {
  color: var(--color-accent);
}

.btn--ghost::after {
  content: ' →';
  transition: transform var(--transition-fast);
  display: inline-block;
}

.btn--ghost:hover::after {
  transform: translateX(4px);
}

/* ==========================================================================
   Cards
   ========================================================================== */

.card {
  background-color: var(--color-warm-white);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  border: 1px solid var(--color-border-light);
  transition: all var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  border-color: var(--color-border);
}

.card--link {
  display: block;
  text-decoration: none;
  color: inherit;
}

.card--link:hover {
  color: inherit;
}

.card--link:hover .card__title {
  color: var(--color-accent);
}

.card__tag {
  font-size: var(--text-xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: var(--tracking-widest);
  color: var(--color-accent);
  margin-bottom: var(--space-3);
}

.card__title {
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  margin-bottom: var(--space-3);
}

.card__description {
  color: var(--color-text-light);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
}

/* ==========================================================================
   Featured Section
   ========================================================================== */

.featured {
  background-color: var(--color-bg-alt);
}

.featured__header {
  text-align: center;
  margin-bottom: var(--space-12);
}

.featured__label {
  font-size: var(--text-xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: var(--tracking-widest);
  color: var(--color-accent);
  margin-bottom: var(--space-4);
}

.featured__title {
  font-size: var(--text-3xl);
}

.featured__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-6);
}

/* ==========================================================================
   About Preview (Home)
   ========================================================================== */

.about-preview {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}

@media (max-width: 900px) {
  .about-preview {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }
}

.about-preview__content {
  max-width: 500px;
}

.about-preview__label {
  font-size: var(--text-xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: var(--tracking-widest);
  color: var(--color-accent);
  margin-bottom: var(--space-4);
}

.about-preview__title {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-6);
}

.about-preview__text {
  color: var(--color-text-light);
  margin-bottom: var(--space-6);
}

.about-preview__image {
  position: relative;
}

.about-preview__image img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
}

/* Decorative frame */
.about-preview__image::before {
  content: '';
  position: absolute;
  top: -20px;
  right: -20px;
  width: 100%;
  height: 100%;
  border: 2px solid var(--color-accent-light);
  border-radius: var(--radius-lg);
  z-index: -1;
  opacity: 0.5;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.footer {
  padding: var(--space-16) 0 var(--space-8);
  background-color: var(--color-bg-alt);
  border-top: 1px solid var(--color-border-light);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-12);
}

@media (max-width: 900px) {
  .footer__grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 600px) {
  .footer__grid {
    grid-template-columns: 1fr;
  }
}

.footer__brand {
  max-width: 300px;
}

.footer__logo {
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

.footer__tagline {
  font-size: var(--text-sm);
  color: var(--color-muted);
  line-height: var(--leading-relaxed);
}

.footer__heading {
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: var(--tracking-widest);
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

.footer__links {
  list-style: none;
}

.footer__links li {
  margin-bottom: var(--space-2);
}

.footer__links a {
  font-size: var(--text-sm);
  color: var(--color-muted);
}

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

.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-border-light);
  font-size: var(--text-xs);
  color: var(--color-muted);
}

@media (max-width: 600px) {
  .footer__bottom {
    flex-direction: column;
    gap: var(--space-4);
    text-align: center;
  }
}

.footer__social {
  display: flex;
  gap: var(--space-4);
}

.footer__social a {
  color: var(--color-muted);
  transition: color var(--transition-fast);
}

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

/* ==========================================================================
   Page Headers
   ========================================================================== */

.page-header {
  padding: var(--space-32) 0 var(--space-16);
  text-align: center;
}

.page-header__title {
  font-size: var(--text-4xl);
  margin-bottom: var(--space-4);
}

.page-header__subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-light);
  max-width: 600px;
  margin: 0 auto;
}

/* ==========================================================================
   Publications
   ========================================================================== */

.publication {
  padding: var(--space-6);
  border-bottom: 1px solid var(--color-border-light);
  transition: background-color var(--transition-fast);
}

.publication:hover {
  background-color: var(--color-highlight);
}

.publication:last-child {
  border-bottom: none;
}

.publication__year {
  font-size: var(--text-sm);
  color: var(--color-muted);
  font-weight: 500;
  margin-bottom: var(--space-2);
}

.publication__title {
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  margin-bottom: var(--space-2);
  color: var(--color-text);
}

.publication__title a {
  color: inherit;
}

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

.publication__authors {
  font-size: var(--text-sm);
  color: var(--color-text-light);
  margin-bottom: var(--space-2);
}

.publication__venue {
  font-size: var(--text-sm);
  font-style: italic;
  color: var(--color-muted);
}

.publication__featured {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  color: var(--color-gold);
  background-color: rgba(201, 169, 89, 0.1);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-sm);
  margin-left: var(--space-2);
}

.publication__links {
  display: flex;
  gap: var(--space-4);
  margin-top: var(--space-3);
}

.publication__link {
  font-size: var(--text-xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  color: var(--color-accent);
}

/* ==========================================================================
   Lab Page
   ========================================================================== */

.lab-hero {
  background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-bg-alt) 100%);
}

.lab-mission {
  font-family: var(--font-serif);
  font-size: var(--text-2xl);
  line-height: var(--leading-relaxed);
  color: var(--color-text);
  max-width: 800px;
  margin: 0 auto var(--space-12);
  text-align: center;
}

.research-areas {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
}

.research-area {
  padding: var(--space-8);
  background-color: var(--color-warm-white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-light);
  text-align: center;
}

.research-area__icon {
  margin-bottom: var(--space-4);
  color: var(--color-accent);
}

.research-area__icon svg {
  width: 48px;
  height: 48px;
}

.research-area__title {
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  margin-bottom: var(--space-3);
}

.research-area__description {
  font-size: var(--text-sm);
  color: var(--color-text-light);
  line-height: var(--leading-relaxed);
}

/* Join the lab */
.join-lab {
  background-color: var(--color-highlight);
  border-radius: var(--radius-xl);
  padding: var(--space-12);
  text-align: center;
}

.join-lab__title {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-4);
}

.join-lab__text {
  max-width: 600px;
  margin: 0 auto var(--space-6);
  color: var(--color-text-light);
}

/* ==========================================================================
   Contact
   ========================================================================== */

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
}

@media (max-width: 768px) {
  .contact-grid {
    grid-template-columns: 1fr;
  }
}

.contact-info__item {
  margin-bottom: var(--space-6);
}

.contact-info__label {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: var(--tracking-widest);
  color: var(--color-muted);
  margin-bottom: var(--space-2);
}

.contact-info__value {
  font-size: var(--text-lg);
  color: var(--color-text);
}

.contact-info__value a {
  color: var(--color-text);
}

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

/* Academic profiles */
.profiles {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.profile-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  background-color: var(--color-warm-white);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  color: var(--color-text);
  transition: all var(--transition-fast);
}

.profile-link:hover {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: white;
}

/* ==========================================================================
   Media Page
   ========================================================================== */

.media-section {
  margin-bottom: var(--space-16);
}

.media-section__title {
  font-size: var(--text-xl);
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-border-light);
}

.media-item {
  display: flex;
  gap: var(--space-4);
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-border-light);
}

.media-item:last-child {
  border-bottom: none;
}

.media-item--link {
  text-decoration: none;
  color: inherit;
  transition: background-color var(--transition-fast);
  border-radius: var(--radius-md);
  margin: 0 calc(-1 * var(--space-3));
  padding: var(--space-4) var(--space-3);
  border-bottom: none;
}

.media-item--link:hover {
  background-color: var(--color-highlight);
  color: inherit;
}

.media-item--link:hover .media-item__title {
  color: var(--color-accent);
}

.media-item--link + .media-item--link {
  border-top: 1px solid var(--color-border-light);
  border-radius: 0;
}

.media-item__icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-highlight);
  border-radius: var(--radius-md);
  color: var(--color-accent);
}

.media-item__content {
  flex-grow: 1;
}

.media-item__outlet {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
}

.media-item__title {
  font-size: var(--text-sm);
  color: var(--color-text-light);
}

.media-item__date {
  font-size: var(--text-xs);
  color: var(--color-muted);
}

/* ==========================================================================
   Utilities
   ========================================================================== */

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-0 { margin-bottom: 0; }
.mb-4 { margin-bottom: var(--space-4); }
.mb-8 { margin-bottom: var(--space-8); }
.mb-12 { margin-bottom: var(--space-12); }

.mt-0 { margin-top: 0; }
.mt-4 { margin-top: var(--space-4); }
.mt-8 { margin-top: var(--space-8); }

.hidden { display: none; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* Reveal on scroll */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger children */
.stagger-children > * {
  opacity: 0;
  transform: translateY(20px);
}

.stagger-children.revealed > *:nth-child(1) { transition-delay: 0.1s; }
.stagger-children.revealed > *:nth-child(2) { transition-delay: 0.2s; }
.stagger-children.revealed > *:nth-child(3) { transition-delay: 0.3s; }
.stagger-children.revealed > *:nth-child(4) { transition-delay: 0.4s; }
.stagger-children.revealed > *:nth-child(5) { transition-delay: 0.5s; }

.stagger-children.revealed > * {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.5s ease, transform 0.5s ease;
}