/* ============================================
   SEAN THOMAS — Portfolio Website
   Dark & Cinematic Theme
   ============================================ */

/* --- Google Fonts loaded in HTML --- */

/* === CSS Custom Properties === */
:root {
  --cyan: #21E7FC;
  --blue: #2151FC;
  --text-name: #87DAFF;
  --text-subtitle: #CBCBCB;
  --dark-teal: #127A8C;
  --dark-blue: #1E3286;

  --bg-primary: #0A0A0F;
  --bg-section: #0D0D14;
  --bg-card: #12121A;
  --bg-elevated: #1A1A24;

  --text-primary: #E8E8EC;
  --text-secondary: #9A9AAE;
  --text-muted: #5A5A70;

  --gradient-accent: linear-gradient(135deg, var(--cyan), var(--blue));
  --gradient-dark: linear-gradient(135deg, var(--dark-teal), var(--dark-blue));

  --font-display: 'Archivo Black', sans-serif;
  --font-body: 'Source Sans 3', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

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

html {
  scroll-behavior: smooth;
  scroll-snap-type: y mandatory;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--cyan);
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  color: var(--text-name);
}

img, video {
  max-width: 100%;
  display: block;
}

section {
  scroll-snap-align: start;
}

/* === Navigation === */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1.25rem 3rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background 0.4s ease, box-shadow 0.4s ease;
}

.nav.scrolled {
  background: rgba(10, 10, 15, 0.88);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 rgba(33, 231, 252, 0.08);
}

.nav__logo {
  height: 38px;
  width: auto;
}

.nav__links {
  display: flex;
  gap: 2.5rem;
  list-style: none;
  align-items: center;
}

.nav__link {
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  position: relative;
  padding-bottom: 2px;
  transition: color 0.3s ease;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-accent);
  transition: width 0.3s ease;
}

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

.nav__link:hover::after,
.nav__link.active::after {
  width: 100%;
}

/* Hamburger */
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}

.nav__hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.nav__hamburger.open span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav__hamburger.open span:nth-child(2) {
  opacity: 0;
}

.nav__hamburger.open span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* === Hero Section === */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  padding: 2rem;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 50% 45%, rgba(18, 122, 140, 0.08) 0%, transparent 70%),
    radial-gradient(ellipse 40% 35% at 50% 50%, rgba(33, 81, 252, 0.05) 0%, transparent 60%);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(33, 231, 252, 0.06) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  opacity: 0.4;
}

.hero__logo {
  width: clamp(280px, 40vw, 500px);
  height: auto;
  margin-bottom: 2.5rem;
  position: relative;
  z-index: 1;
  filter: drop-shadow(0 0 50px rgba(33, 231, 252, 0.15));
}

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

.hero__tagline {
  font-family: var(--font-body);
  font-size: clamp(1rem, 1.4vw, 1.2rem);
  color: var(--text-secondary);
  margin-top: 2rem;
  position: relative;
  z-index: 1;
  font-weight: 400;
}

.hero__scroll {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  z-index: 1;
}

.hero__scroll span {
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.hero__scroll-arrow {
  width: 20px;
  height: 20px;
  border-right: 2px solid var(--cyan);
  border-bottom: 2px solid var(--cyan);
  transform: rotate(45deg);
  animation: scrollBounce 2s ease-in-out infinite;
  opacity: 0.6;
}

@keyframes scrollBounce {
  0%, 100% { transform: rotate(45deg) translateY(0); opacity: 0.6; }
  50% { transform: rotate(45deg) translateY(6px); opacity: 1; }
}

/* === Project Sections === */
.project {
  min-height: 100vh;
  display: grid;
  align-items: center;
  padding: 6rem max(5%, calc((100% - 1500px) / 2));
  gap: 4rem;
  position: relative;
}

.project:nth-child(odd) {
  grid-template-columns: 1fr 1fr;
}

.project:nth-child(even) {
  grid-template-columns: 1fr 1fr;
}

.project:nth-child(even) .project__media {
  order: 2;
}

.project:nth-child(even) .project__content {
  order: 1;
}

/* Alternating subtle background */
.project:nth-child(even) {
  background: var(--bg-section);
}

/* Divider line between projects */
.project::before {
  content: '';
  position: absolute;
  top: 0;
  left: 5%;
  right: 5%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(33, 231, 252, 0.12), transparent);
}

.project__media {
  position: relative;
  border-radius: 8px;
  overflow: visible;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.project__media--side-by-side {
  flex-direction: row;
  gap: 0.75rem;
  align-items: stretch;
}

.project__media--side-by-side video,
.project__media--side-by-side img {
  flex: 1;
  min-width: 0;
  max-width: 50%;
  max-height: 55vh;
  object-fit: cover;
}

.project__media video,
.project__media img {
  width: 100%;
  height: auto;
  max-height: 55vh;
  object-fit: contain;
  border-radius: 8px;
  display: block;
}

.project__media::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 8px;
  box-shadow: inset 0 0 0 1px rgba(33, 231, 252, 0.08);
  pointer-events: none;
}

.project__media--glow {
  filter: drop-shadow(0 4px 40px rgba(33, 231, 252, 0.1));
}

.project__number {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--cyan);
  letter-spacing: 0.1em;
  opacity: 0.7;
  margin-bottom: 0.75rem;
}

.project__title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  color: var(--text-primary);
  line-height: 1.15;
  margin-bottom: 1.25rem;
}

.project__description {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 1.5rem;
  max-width: 520px;
}

.project__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.project__tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.3rem 0.75rem;
  border: 1px solid rgba(33, 231, 252, 0.2);
  border-radius: 100px;
  color: var(--cyan);
  letter-spacing: 0.04em;
  background: rgba(33, 231, 252, 0.04);
  transition: background 0.3s ease, border-color 0.3s ease;
}

.project__tag:hover {
  background: rgba(33, 231, 252, 0.1);
  border-color: rgba(33, 231, 252, 0.4);
}

.project__publication {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  text-decoration: none;
  padding: 0.5rem 1rem;
  background: var(--bg-card);
  border-radius: 6px;
  border-left: 3px solid;
  border-image: var(--gradient-accent) 1;
  transition: background 0.3s ease;
}

.project__publication:hover {
  background: var(--bg-elevated);
}

.project__publication-icon {
  font-size: 1rem;
  flex-shrink: 0;
}

.project__publication-text {
  line-height: 1.4;
}

.project__publication-text strong {
  color: var(--text-primary);
  font-weight: 600;
  display: block;
  font-size: 0.82rem;
}

.project__publication-text span {
  font-size: 0.78rem;
}

/* Secondary image inset */
.project__secondary-img,
.project__secondary-video {
  margin-top: 0.75rem;
  width: 100%;
  border-radius: 8px;
  box-shadow: 0 0 30px rgba(33, 231, 252, 0.08);
}

/* === About Section === */
.about {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  align-items: center;
  gap: 5rem;
  padding: 6rem 8%;
  scroll-snap-align: start;
  background: var(--bg-section);
}

.about__image-wrapper {
  display: flex;
  justify-content: center;
}

.about__image {
  width: 280px;
  height: auto;
  border: none;
}

.about__label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--cyan);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.about__heading {
  font-family: var(--font-display);
  font-size: clamp(2rem, 3vw, 3rem);
  color: var(--text-primary);
  margin-bottom: 1.5rem;
  line-height: 1.2;
}

.about__text {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 2rem;
  max-width: 600px;
}

.about__skills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 2rem;
}

.about__skill {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.4rem 0.9rem;
  background: var(--bg-card);
  border: 1px solid rgba(33, 231, 252, 0.12);
  border-radius: 6px;
  color: var(--text-primary);
  letter-spacing: 0.03em;
}

.about__links {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.about__link {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--cyan);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: color 0.3s ease;
}

.about__link:hover {
  color: var(--text-name);
}

/* === Publications Section === */
.publications {
  min-height: 100vh;
  padding: 6rem 8%;
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.publications__label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--cyan);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.publications__heading {
  font-family: var(--font-display);
  font-size: clamp(2rem, 3vw, 3rem);
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.publications__subtext {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 3rem;
}

.publications__subtext a {
  font-weight: 600;
}

.publications__list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: 900px;
}

.pub-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 1.25rem;
  align-items: baseline;
  padding: 1rem 1.25rem;
  border-radius: 8px;
  transition: background 0.3s ease;
  border-left: 2px solid transparent;
}

.pub-item:hover {
  background: var(--bg-card);
  border-left-color: var(--cyan);
}

.pub-item__year {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--cyan);
  min-width: 3rem;
}

.pub-item__title {
  font-size: 0.95rem;
  color: var(--text-primary);
  font-weight: 600;
  line-height: 1.4;
}

.pub-item__venue {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-style: italic;
  white-space: nowrap;
}

/* Patent highlight */
.pub-item--patent {
  border: 1px solid rgba(33, 231, 252, 0.12);
  background: rgba(33, 231, 252, 0.03);
}

.pub-item--patent:hover {
  background: rgba(33, 231, 252, 0.06);
}

/* === Contact Section === */
.contact {
  min-height: 60vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 6rem 2rem;
  scroll-snap-align: start;
  background: var(--bg-section);
  position: relative;
}

.contact::before {
  content: '';
  position: absolute;
  top: 0;
  left: 10%;
  right: 10%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(33, 231, 252, 0.15), transparent);
}

.contact__label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--cyan);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.contact__heading {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3.5rem);
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.contact__text {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
  max-width: 500px;
}

.contact__cv-btn {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  padding: 0.75rem 2rem;
  border: 2px solid var(--cyan);
  border-radius: 6px;
  color: var(--cyan);
  letter-spacing: 0.03em;
  margin-bottom: 2rem;
  transition: background 0.3s ease, color 0.3s ease;
}

.contact__cv-btn:hover {
  background: var(--cyan);
  color: var(--bg-primary);
}

.contact__email {
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 2.5vw, 1.8rem);
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  transition: opacity 0.3s ease;
}

.contact__email:hover {
  opacity: 0.8;
}

.contact__location {
  margin-top: 2rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.contact__socials {
  display: flex;
  gap: 1.5rem;
  margin-top: 2rem;
}

.contact__social {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: color 0.3s ease;
}

.contact__social:hover {
  color: var(--cyan);
}

/* === Footer === */
.footer {
  padding: 2rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
  border-top: 1px solid rgba(255, 255, 255, 0.04);
}

/* === Scroll Reveal Animations === */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* === Focus Styles === */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 2px;
}

/* === Skip Link === */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  padding: 0.75rem 1.5rem;
  background: var(--cyan);
  color: var(--bg-primary);
  font-weight: 700;
  border-radius: 0 0 6px 6px;
  z-index: 200;
  transition: top 0.3s;
}

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

/* === Responsive === */
@media (max-width: 1024px) {
  .project {
    padding: 5rem 5%;
    gap: 3rem;
  }

  .about {
    padding: 5rem 5%;
    gap: 3rem;
  }
}

@media (max-width: 768px) {
  html {
    scroll-snap-type: none;
  }

  .nav {
    padding: 1rem 1.5rem;
  }

  .nav__links {
    display: none;
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 280px;
    background: rgba(10, 10, 15, 0.96);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 5rem 2rem;
    gap: 2rem;
  }

  .nav__links.open {
    display: flex;
  }

  .nav__hamburger {
    display: flex;
    z-index: 110;
  }

  .project,
  .project:nth-child(odd),
  .project:nth-child(even) {
    grid-template-columns: 1fr;
    min-height: auto;
    padding: 4rem 5%;
  }

  .project__media {
    max-height: none;
  }

  .project__media--side-by-side {
    flex-direction: row;
    max-height: 40vh;
  }

  .project__media--side-by-side video,
  .project__media--side-by-side img {
    width: 50%;
    max-height: 40vh;
  }

  .project:nth-child(even) .project__media,
  .project:nth-child(even) .project__content {
    order: unset;
  }

  .project__secondary-img,
  .project__secondary-video {
    margin-top: 0.5rem;
  }

  .about {
    grid-template-columns: 1fr;
    text-align: center;
    padding: 4rem 5%;
    min-height: auto;
  }

  .about__text {
    max-width: none;
  }

  .about__skills {
    justify-content: center;
  }

  .about__links {
    justify-content: center;
  }

  .publications {
    padding: 4rem 5%;
    min-height: auto;
  }

  .pub-item {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }

  .pub-item__venue {
    white-space: normal;
  }
}

@media (max-width: 480px) {
  .project__title {
    font-size: 1.6rem;
  }
}

/* === Reduced Motion === */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
    scroll-snap-type: none;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .hero__scroll-arrow {
    animation: none;
  }

  video {
    animation: none;
  }
}