@import url('https://fonts.googleapis.com/css2?family=Space+Mono:wght@400;700&family=Inter:wght@300;400;500;600&family=Space+Grotesk:wght@500;700&display=swap');

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

:root {
  --bg:      #080808;
  --panel:   #0e1114;
  --text:    #f2f2f2;
  --body-text: #c8c8c8;
  --dim:     #777;
  --sky:     #8ecae6;
  --teal:    #219ebc;
  --deep:    #023047;
  --amber:   #ffb703;
  --orange:  #fb8500;
  --mono:    'Space Mono', monospace;
  --body:    'Inter', sans-serif;
  --display: 'Space Grotesk', sans-serif;
  --grad:    linear-gradient(90deg, var(--orange) 0%, var(--amber) 22%, var(--sky) 58%, var(--teal) 100%);
  --border:  rgba(33, 158, 188, 0.2);
}

html { scroll-behavior: smooth; background: var(--bg); }

body {
  background: transparent;
  color: var(--body-text);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.75;
  padding: 0;
  text-align: left;
}

#topo-canvas {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  display: block;
  pointer-events: none;
  z-index: -1;
}

/* ── back link ── */
.proj-back {
  position: fixed;
  top: 1.25rem;
  left: 1.5rem;
  z-index: 100;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.24em;
  color: var(--sky);
  text-decoration: none;
  opacity: 0.55;
  transition: opacity 0.2s, color 0.2s;
  padding: 0.4rem 0.6rem;
}
.proj-back:hover { opacity: 1; color: var(--amber); }

/* ── title ── */
.title-block {
  max-width: 1000px;
  margin: 0 auto;
  padding: 7rem 2rem 3rem;
  text-align: center;
  background: transparent;
  color: var(--text);
}

.title-block h1 {
  font-family: var(--display);
  font-size: clamp(2.5rem, 6vw, 5rem);
  font-weight: 700;
  letter-spacing: 0.01em;
  line-height: 1;
  background: var(--grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
          background-clip: text;
  color: transparent;
  display: inline-block;
  margin-bottom: 1rem;
}

.title-block h2,
.title-block h3 {
  font-family: var(--mono);
  font-size: 0.8rem;
  font-weight: 400;
  color: var(--dim);
  letter-spacing: 0.25em;
  text-transform: uppercase;
  margin: 0.4rem 0;
}

.title-block p {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--dim);
  letter-spacing: 0.2em;
}

/* ── sections ── */
section {
  max-width: 1000px;
  margin: 3rem auto;
  padding: 0 2rem;
}

section h2 {
  font-family: var(--display);
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 700;
  margin: 3.5rem 0 1.25rem;
  color: var(--sky);
  letter-spacing: 0.01em;
  text-align: left;
}

section h2::after,
.section-header::after {
  content: '';
  display: block;
  width: 60px;
  height: 2px;
  background: linear-gradient(90deg, var(--orange), var(--amber));
  margin: 0.6rem 0 0;
}

section h3 {
  font-family: var(--display);
  font-size: 1.2rem;
  font-weight: 500;
  margin: 2rem 0 0.75rem;
  color: var(--amber);
}

section h4 {
  font-family: var(--mono);
  font-size: 0.9rem;
  color: var(--teal);
  margin: 1.5rem 0 0.5rem;
  letter-spacing: 0.06em;
}

section p {
  font-size: 1rem;
  line-height: 1.75;
  margin-bottom: 1.1rem;
  color: var(--body-text);
  text-align: left;
}

section ul,
section ol {
  margin: 1rem 0 1rem 1.5rem;
  color: var(--body-text);
}

section li {
  margin-bottom: 0.4rem;
  font-size: 1rem;
  line-height: 1.65;
}

/* ── code & math ── */
code {
  font-family: var(--mono);
  font-size: 0.92em;
  background: rgba(2, 48, 71, 0.35);
  padding: 0.15em 0.45em;
  border-radius: 3px;
  color: var(--sky);
}

pre {
  background: rgba(2, 48, 71, 0.3);
  padding: 1rem 1.25rem;
  border-radius: 4px;
  overflow-x: auto;
  border: 1px solid var(--border);
  margin: 1rem 0;
  font-size: 0.85rem;
}

pre code {
  background: transparent;
  padding: 0;
  color: var(--sky);
}

/* ── links ── */
a {
  color: var(--teal);
  text-decoration: none;
  border-bottom: 1px dotted var(--teal);
  transition: color 0.15s, border-color 0.15s;
}
a:hover {
  color: var(--amber);
  border-bottom-color: var(--amber);
}

/* ── image grid ── */
.image-container,
.abstract-images,
.ncc-image-container,
.hover-image-container-melons {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
  justify-items: center;
}

.image-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

img {
  max-width: 100%;
  width: auto;
  height: auto;
  border: 1px solid var(--border);
  border-radius: 4px;
  display: block;
}

.image-item p,
.image-item span,
.caption {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--teal);
  letter-spacing: 0.06em;
  text-align: center;
  margin: 0;
}

/* ── abstract container (restoration) ── */
.abstract-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin: 2rem 0;
}

.abstract-text {
  text-align: left;
}

@media (min-width: 800px) {
  .abstract-container {
    grid-template-columns: 1.2fr 1fr;
    align-items: center;
  }
}

/* ── poster pages (rl, lora) ── */
.poster-wrap {
  max-width: 1500px;
  margin: 4.5rem auto 1.5rem;
  padding: 0 2rem;
}

.poster-wrap > img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--border);
  border-radius: 6px;
}

.poster-wrap > object {
  width: 100%;
  height: 92vh;
  display: block;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #0c1015;
}

.poster-fallback {
  padding: 3rem 2rem;
  text-align: center;
  font-family: var(--mono);
  color: var(--dim);
}

.poster-caption {
  max-width: 1500px;
  margin: 0 auto 4rem;
  padding: 0 2rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--dim);
  letter-spacing: 0.18em;
  text-align: center;
  text-transform: uppercase;
}

/* ── responsive ── */
@media (max-width: 640px) {
  section { padding: 0 1.25rem; }
  .title-block { padding: 5rem 1.25rem 2rem; }
  .image-container,
  .abstract-images,
  .ncc-image-container,
  .hover-image-container-melons {
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
  }
}