@font-face {
  font-family: "Scala Sans Pro";
  src: url("assets/Scala Sans/scalasanspro-regular.ttf") format("truetype");
  font-weight: 400;
  font-style: normal;
}

@font-face {
  font-family: "Scala Sans Pro";
  src: url("assets/Scala Sans/scalasanspro-italic.ttf") format("truetype");
  font-weight: 400;
  font-style: italic;
}

@font-face {
  font-family: "Scala Sans Pro";
  src: url("assets/Scala Sans/scalasanspro-bold.ttf") format("truetype");
  font-weight: 700;
  font-style: normal;
}

@font-face {
  font-family: "Scala Sans Pro";
  src: url("assets/Scala Sans/scalasanspro-bolditalic.ttf") format("truetype");
  font-weight: 700;
  font-style: italic;
}

:root {
  --bg: #fff;
  --text: #333;
  --text-muted: #666;
  --border: #e0e0e0;
  --surface: #f5f5f5;
  --btn-bg: #333;
  --footer-bg: #f0f0f0;
  --max-width: 860px;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --radius: 8px;
  --font-sans: "Scala Sans Pro", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", "Source Code Pro", Menlo, monospace;
}

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

html {
  scrollbar-width: none;
  -ms-overflow-style: none;
}

html::-webkit-scrollbar {
  display: none;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-lg) var(--space-md);
}

.hero {
  text-align: center;
  margin-bottom: var(--space-md);
}

.hero__title {
  margin: 0 0 var(--space-xs);
  font-size: clamp(1.4rem, 3.5vw, 1.75rem);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.hero__subtitle {
  margin: 0;
  font-size: 1.125rem;
  color: var(--text-muted);
  font-weight: 400;
}

.authors {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.author {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  min-width: 72px;
}

.author__avatar {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: var(--space-xs);
}

.author__name {
  font-weight: 600;
  font-size: 0.9rem;
}

.author__affiliation {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 0.5rem 0.75rem;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: opacity 0.15s ease;
}

.btn:hover {
  opacity: 0.9;
}

.btn:focus-visible {
  outline: 2px solid var(--text);
  outline-offset: 2px;
}

.btn__icon {
  width: 1rem;
  height: 1rem;
  flex-shrink: 0;
}

.btn--primary {
  background: var(--btn-bg);
  color: #fff;
}

.btn--secondary {
  background: var(--btn-bg);
  color: #fff;
}

/* Abstract */
.abstract {
  margin-bottom: var(--space-xl);
}

.section-title {
  margin: 0 0 var(--space-xs);
  font-size: 1.25rem;
  font-weight: 700;
}

.abstract__text {
  margin: 0;
}

.abstract__chart {
  margin: var(--space-lg) 0 0;
  text-align: center;
}

.abstract__chart-img {
  display: block;
  width: 100%;
  max-width: 560px;
  height: auto;
  margin: 0 auto;
  border-radius: var(--radius);
}

.video-demo {
  margin-bottom: var(--space-xl);
}

.video-demo__intro {
  margin: 0 0 var(--space-md);
}

.video-placeholder {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  aspect-ratio: 16 / 9;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
}

.video-placeholder__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  color: var(--text-muted);
  font-size: 0.9rem;
}

.video-placeholder__label {
  font-weight: 600;
}

.video-demo__btn {
  margin-top: var(--space-sm);
}

/* BibTeX */
.bibtex {
  margin-bottom: var(--space-xl);
}

.bibtex__block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-md);
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.bibtex__block::-webkit-scrollbar {
  display: none;
}

.bibtex__content {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--text);
  white-space: pre;
}

.footer {
  padding: var(--space-md) var(--space-lg);
  background: var(--footer-bg);
  margin-top: var(--space-xl);
}

.footer__text {
  margin: 0;
  font-size: 0.875rem;
  color: var(--text-muted);
  text-align: center;
}

.footer__link {
  color: var(--text);
  text-decoration: underline;
}

.footer__link:hover {
  opacity: 0.8;
}

@media (max-width: 640px) {
  .authors {
    gap: var(--space-md);
  }

  .actions {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    justify-content: center;
  }
}