:root {
  --bg: #030504;
  --bg-elevated: #0a100c;
  --surface: #0d1410;
  --border: #1a2820;
  --text: #e6f0e8;
  --muted: #8fa89a;
  --accent: #c8ff3d;
  --accent-strong: #dfff6a;
  --accent-dim: #1f5f47;
  --accent-glow: rgba(200, 255, 61, 0.35);
  --radius: 14px;
  --font-display: "Orbitron", system-ui, sans-serif;
  --font-body: "DM Sans", system-ui, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.55;
  color: var(--text);
  background: var(--bg);
}

.bg-grid {
  pointer-events: none;
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(31, 95, 71, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(31, 95, 71, 0.07) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, black, transparent);
  z-index: 0;
}

main {
  position: relative;
  z-index: 1;
  padding-bottom: 4rem;
  overflow-x: hidden;
}

.site-identity {
  max-width: 1280px;
  margin: 0 auto;
  padding: clamp(1rem, 2.5vw, 1.5rem) clamp(1.25rem, 4vw, 3rem)
    clamp(0.35rem, 1vw, 0.5rem);
  text-align: center;
  border-bottom: 1px solid var(--border);
}

.site-identity-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.35rem, 3.5vw, 2rem);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text);
  margin: 0 0 0.4rem;
  line-height: 1.2;
}

.site-identity-role {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(0.85rem, 2vw, 1rem);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  text-shadow: 0 0 28px var(--accent-glow);
  margin: 0;
}

#intro,
#project-photos,
#skills,
#projects {
  scroll-margin-top: 1.25rem;
}

/* Continuous horizontal strip — same outer width/padding as .section (Skills, Portfolio) */
.projects-marquee-section {
  position: relative;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: clamp(1rem, 2.5vw, 1.35rem) clamp(1.25rem, 4vw, 3rem);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: linear-gradient(
    90deg,
    rgba(3, 5, 4, 0.95) 0%,
    rgba(13, 20, 16, 0.65) 15%,
    rgba(13, 20, 16, 0.65) 85%,
    rgba(3, 5, 4, 0.95) 100%
  );
  overflow-x: hidden;
}

.projects-marquee-viewport {
  position: relative;
  width: 100%;
  max-width: 100%;
  margin-inline: auto;
  overflow: hidden;
  mask-image: linear-gradient(
    90deg,
    transparent,
    black 12%,
    black 88%,
    transparent
  );
}

.projects-marquee-arrow {
  position: absolute;
  top: 50%;
  z-index: 2;
  translate: 0 -50%;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.65rem;
  height: 2.65rem;
  margin: 0;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: rgba(10, 16, 12, 0.92);
  color: var(--accent);
  cursor: pointer;
  opacity: 1;
  pointer-events: auto;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.45);
  transition:
    background 0.2s ease,
    border-color 0.2s ease,
    color 0.2s ease,
    box-shadow 0.2s ease;
}

.projects-marquee-arrow--prev {
  left: clamp(0.25rem, 1.5vw, 0.65rem);
}

.projects-marquee-arrow--next {
  right: clamp(0.25rem, 1.5vw, 0.65rem);
}

.projects-marquee-arrow:hover,
.projects-marquee-arrow:focus-visible {
  background: rgba(13, 20, 16, 0.98);
  border-color: var(--accent-dim);
  color: var(--accent-strong);
  box-shadow:
    0 4px 24px rgba(0, 0, 0, 0.55),
    0 0 0 1px var(--accent-glow);
}

.projects-marquee-arrow:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.projects-marquee-arrow-icon {
  width: 1.15rem;
  height: 1.15rem;
}

.projects-marquee-track {
  display: flex;
  width: max-content;
  gap: clamp(0.65rem, 1.2vw, 1rem);
  will-change: transform;
}

.projects-marquee-item {
  flex: 0 0 auto;
  margin: 0;
  width: clamp(200px, 26vw, 320px);
  height: clamp(140px, 18vw, 220px);
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.35);
}

.projects-marquee-item img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

@media (prefers-reduced-motion: reduce) {
  .projects-marquee-arrow {
    display: none;
  }

  .projects-marquee-track {
    animation: none;
    justify-content: center;
    flex-wrap: wrap;
    width: 100%;
    max-width: 100%;
    margin: 0;
    padding: 0;
    transform: none;
  }

  .projects-marquee-item {
    width: clamp(160px, 40vw, 280px);
  }
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(260px, 0.65fr);
  gap: clamp(1.15rem, 2.5vw, 2rem);
  align-items: center;
  padding: clamp(0.55rem, 1.5vw, 1rem) clamp(1.25rem, 4vw, 3rem)
    clamp(1.5rem, 3vw, 2.5rem);
  max-width: 1280px;
  margin: 0 auto;
}

.hero-copy {
  max-width: none;
  width: 100%;
  min-width: 0;
}

.eyebrow {
  font-family: var(--font-display);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent-dim);
  margin: 0 0 0.65rem;
}

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

.hero-carousel {
  margin: 0 0 1.75rem;
}

.hero-carousel-viewport {
  position: relative;
  min-height: 16rem;
}

@media (min-width: 600px) {
  .hero-carousel-viewport {
    min-height: 14rem;
  }
}

@media (min-width: 900px) {
  .hero-carousel-viewport {
    min-height: 15.5rem;
  }
}

.hero-carousel-track {
  position: relative;
}

.hero-carousel-slide {
  font-family: var(--font-body);
  font-size: clamp(1.35rem, 3.4vw, 1.85rem);
  font-weight: 600;
  line-height: 1.45;
  margin: 0;
  color: var(--text);
  opacity: 0;
  visibility: hidden;
  transition:
    opacity 0.55s ease,
    visibility 0.55s ease;
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
}

.hero-carousel-highlight {
  color: var(--accent);
  font-weight: 700;
  text-shadow: 0 0 24px var(--accent-glow);
}

.region-highlight {
  color: #5fe8a8;
  text-shadow: 0 0 22px rgba(95, 232, 168, 0.45);
}

.hero-carousel-slide.is-active {
  position: relative;
  opacity: 1;
  visibility: visible;
  z-index: 1;
}

.hero-carousel-dots {
  display: flex;
  gap: 0.5rem;
  margin-top: 1.1rem;
  align-items: center;
}

.hero-carousel-dot {
  width: 10px;
  height: 10px;
  padding: 0;
  border: 2px solid var(--border);
  border-radius: 50%;
  background: transparent;
  cursor: pointer;
  transition:
    background 0.2s ease,
    border-color 0.2s ease,
    transform 0.2s ease;
}

.hero-carousel-dot:hover {
  border-color: var(--accent-dim);
  background: rgba(200, 255, 61, 0.15);
}

.hero-carousel-dot[aria-selected="true"] {
  background: var(--accent);
  border-color: var(--accent);
  transform: scale(1.15);
  box-shadow: 0 0 12px var(--accent-glow);
}

.hero-visual {
  justify-self: end;
  text-align: center;
  width: 100%;
  max-width: 420px;
}

.portrait {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  vertical-align: middle;
  background: transparent;
}

.section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2.5rem clamp(1.25rem, 4vw, 3rem);
}

.section-head {
  margin-bottom: 1.75rem;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 3vw, 1.75rem);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.75rem;
}

.section-desc {
  margin: 0;
  max-width: 52rem;
  color: var(--muted);
}

.section-desc strong {
  color: var(--text);
  font-weight: 600;
}

.skills-section {
  border-top: none;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, transparent, rgba(31, 95, 71, 0.06));
}

.skills-toolbar {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0.85rem;
  margin-bottom: 1.25rem;
}

.skills-filter-primary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
}

.btn-all {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.55rem 1.15rem;
  border-radius: 999px;
  border: 1px solid var(--accent);
  background: rgba(200, 255, 61, 0.08);
  color: var(--accent-strong);
  cursor: pointer;
  transition:
    background 0.2s ease,
    box-shadow 0.2s ease,
    transform 0.15s ease;
}

.btn-all:hover {
  background: rgba(200, 255, 61, 0.18);
  box-shadow: 0 0 24px var(--accent-glow);
}

.btn-all[aria-pressed="true"] {
  background: var(--accent);
  color: #0a0f0c;
  box-shadow: 0 0 28px var(--accent-glow);
}

.filter-hint {
  font-size: 0.9rem;
  color: var(--muted);
}

.skill-chips {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  align-items: stretch;
}

.skill-chips-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skill-chips-row--sub {
  padding-top: 0.65rem;
  margin-top: 0.1rem;
  border-top: 1px solid var(--border);
}

.skill-coarse-btn {
  font-family: var(--font-body);
  font-size: 0.84rem;
  font-weight: 500;
  padding: 0.45rem 0.95rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  line-height: 1.3;
  text-align: center;
  transition:
    border-color 0.2s ease,
    box-shadow 0.2s ease,
    color 0.2s ease;
}

.skill-coarse-btn:hover {
  border-color: var(--accent-dim);
  color: var(--accent-strong);
}

.skill-coarse-btn[aria-pressed="true"] {
  border-color: var(--accent);
  color: var(--bg);
  background: var(--accent);
  box-shadow: 0 0 18px var(--accent-glow);
}

.skill-sub-btn {
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 500;
  padding: 0.32rem 0.72rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(31, 95, 71, 0.2);
  color: var(--text);
  cursor: pointer;
  transition:
    border-color 0.2s ease,
    box-shadow 0.2s ease,
    color 0.2s ease;
}

.skill-sub-btn:hover {
  border-color: var(--accent-dim);
  color: var(--accent-strong);
}

.skill-sub-btn[aria-pressed="true"] {
  border-color: var(--accent);
  color: var(--bg);
  background: var(--accent);
  box-shadow: 0 0 14px var(--accent-glow);
}

.skill-chip {
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 500;
  padding: 0.4rem 0.85rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  transition:
    border-color 0.2s ease,
    box-shadow 0.2s ease,
    color 0.2s ease;
}

.skill-chip:hover {
  border-color: var(--accent-dim);
  color: var(--accent-strong);
}

.skill-chip[aria-pressed="true"] {
  border-color: var(--accent);
  color: var(--bg);
  background: var(--accent);
  box-shadow: 0 0 18px var(--accent-glow);
}

.project-section-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-bottom: 1.75rem;
  padding-bottom: 0.35rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.project-section-tab {
  font-family: var(--font-body);
  font-size: 0.98rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 0.85rem 1.45rem;
  min-height: 48px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--muted);
  cursor: pointer;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition:
    border-color 0.2s ease,
    background 0.2s ease,
    color 0.2s ease,
    box-shadow 0.2s ease;
}

.project-section-tab:hover {
  border-color: var(--accent-dim);
  color: var(--text);
}

.project-section-tab[aria-selected="true"] {
  border-color: var(--accent);
  color: var(--bg);
  background: var(--accent);
  box-shadow: 0 0 20px var(--accent-glow);
}

.project-empty {
  grid-column: 1 / -1;
  margin: 0.5rem 0 1rem;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}

.project-grid--wide {
  grid-template-columns: 1fr;
}

.project-grid--wide .project-card {
  max-width: 100%;
}

.project-card--competition h3 {
  margin-bottom: 0.5rem;
}

.project-card--competition .project-card-subtitle {
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--text);
  text-align: left;
  margin: 0 0 0.5rem;
  line-height: 1.45;
}

.project-card--competition .project-card-detail {
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 600;
  font-style: normal;
  letter-spacing: 0.06em;
  text-align: right;
  color: var(--muted);
  margin: 0;
  opacity: 1;
}

.project-card--paper {
  padding: 1.15rem 1.4rem;
}

.paper-citation {
  font-family: var(--font-body);
  font-size: clamp(0.88rem, 1.35vw, 0.97rem);
  line-height: 1.55;
  color: var(--text);
  margin: 0;
}

.paper-citation-title {
  font-weight: 600;
  color: var(--text);
}

.paper-citation-authors {
  color: var(--text);
}

.paper-citation-authors strong {
  font-weight: 700;
}

.paper-citation-venue {
  font-style: italic;
  color: var(--muted);
}

.project-card {
  display: flex;
  flex-direction: column;
  padding: 1.25rem 1.35rem;
  border-radius: var(--radius);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  transition:
    border-color 0.2s ease,
    transform 0.2s ease,
    box-shadow 0.2s ease;
}

.project-card:hover {
  border-color: rgba(200, 255, 61, 0.35);
  transform: translateY(-3px);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.45);
}

.project-card h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  margin: 0 0 0.75rem;
  color: var(--text);
  line-height: 1.35;
}

.project-card-subtitle {
  font-family: var(--font-body);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--muted);
  margin: -0.35rem 0 0.65rem;
  line-height: 1.4;
}

.project-card-detail {
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 400;
  font-style: italic;
  color: var(--muted);
  margin: -0.25rem 0 0.65rem;
  line-height: 1.45;
  opacity: 0.92;
}

.project-meta {
  margin-top: auto;
  padding-top: 0.75rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.project-pill {
  font-size: 0.72rem;
  padding: 0.2rem 0.5rem;
  border-radius: 6px;
  background: rgba(31, 95, 71, 0.35);
  color: var(--muted);
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.project-pill.more {
  background: rgba(200, 255, 61, 0.12);
  color: var(--accent);
}

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

  .hero-visual {
    justify-self: center;
    order: -1;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .hero-carousel-slide {
    transition: none;
  }

  .project-card,
  .skill-chip,
  .skill-coarse-btn,
  .skill-sub-btn,
  .btn-all,
  .project-section-tab {
    transition: none;
  }
}