:root {
  --bg: #f3f1ea;
  --ink: #1f252d;
  --ink-soft: #44505f;
  --accent: #006a6a;
  --accent-2: #9e3d25;
  --panel: rgba(255, 255, 255, 0.76);
  --line: rgba(31, 37, 45, 0.16);
  --shadow: 0 12px 36px rgba(16, 22, 30, 0.12);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "IBM Plex Sans", sans-serif;
  color: var(--ink);
  min-height: 100vh;
  background:
    radial-gradient(1200px 460px at -15% -12%, rgba(0, 106, 106, 0.15), transparent 60%),
    radial-gradient(1000px 440px at 108% 0%, rgba(158, 61, 37, 0.14), transparent 62%),
    linear-gradient(180deg, #f8f7f3 0%, var(--bg) 100%);
  line-height: 1.6;
}

.grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.18;
  background-image: radial-gradient(rgba(14, 22, 31, 0.07) 0.6px, transparent 0.6px);
  background-size: 3px 3px;
}

.container {
  width: min(1040px, calc(100% - 2.2rem));
  margin: 0 auto;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(8px);
  background: rgba(243, 241, 234, 0.74);
  border-bottom: 1px solid var(--line);
}

.nav-inner {
  min-height: 58px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
}

.brand {
  text-decoration: none;
  color: var(--ink);
  font-weight: 700;
  letter-spacing: 0.06em;
}

nav {
  display: flex;
  gap: 1rem;
}

nav a {
  color: var(--ink-soft);
  text-decoration: none;
  font-weight: 700;
  font-size: 0.92rem;
}

h1 {
  font-family: "IBM Plex Serif", serif;
  font-size: clamp(2.1rem, 5.1vw, 4rem);
  line-height: 1.08;
  margin: 0.4rem 0 1rem;
}

.subtitle {
  font-size: clamp(1rem, 1.8vw, 1.2rem);
  max-width: 50rem;
  margin: 0;
  color: var(--ink-soft);
}

.authors-inline {
  margin-top: 0.95rem;
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.authors-inline span {
  padding: 0.24rem 0.58rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 0.9rem;
  background: rgba(255, 255, 255, 0.65);
}

.note {
  margin: 0.55rem 0 0;
  color: var(--ink-soft);
  font-size: 0.88rem;
}

.page-corner-logos {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: -0.45rem;
}

.page-corner-logos img {
  height: 36px;
  width: auto;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.9);
  padding: 0.34rem 0.5rem;
  box-shadow: 0 4px 10px rgba(16, 22, 30, 0.08);
}

.hero {
  padding: 4.6rem 0 2rem;
}

.venue {
  margin: 0;
  font-size: 0.84rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 700;
}

.hero-actions {
  margin-top: 1.6rem;
  display: flex;
  gap: 0.7rem;
  flex-wrap: wrap;
}

.button {
  display: inline-block;
  border: 1px solid var(--line);
  color: var(--ink-soft);
  text-decoration: none;
  padding: 0.5rem 0.92rem;
  border-radius: 10px;
  font-weight: 700;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  background: rgba(255, 255, 255, 0.72);
}

.button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
  border-color: var(--accent);
}

.button.primary {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}

.panel {
  margin-top: 1.3rem;
  padding: 1.2rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
  backdrop-filter: blur(6px);
  box-shadow: var(--shadow);
}

h2 {
  font-family: "IBM Plex Serif", serif;
  margin: 0 0 0.65rem;
  font-size: clamp(1.42rem, 2.6vw, 2rem);
}

.section-lead {
  margin-top: -0.1rem;
  color: var(--ink-soft);
}

.equation {
  margin: 0.7rem 0;
  padding: 0.45rem 0.7rem;
  border-left: 3px solid var(--accent);
  background: rgba(255, 255, 255, 0.62);
  overflow-x: auto;
}

.formula-notes {
  margin: 0.7rem 0 0;
  padding-left: 1.1rem;
  color: var(--ink-soft);
}

.formula-notes li {
  margin: 0.28rem 0;
}

.cards-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.82rem;
}

.card {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1rem;
  background: rgba(255, 255, 255, 0.58);
}

.card h3 {
  margin-top: 0;
  margin-bottom: 0.45rem;
  font-family: "IBM Plex Serif", serif;
}

.card a {
  color: var(--accent);
  font-weight: 700;
}

.media-block {
  margin-top: 1.1rem;
}

.subpanel {
  margin-top: 0.9rem;
}

.subpanel h3 {
  margin-top: 0;
  margin-bottom: 0.4rem;
  font-family: "IBM Plex Serif", serif;
}

.subpanel img {
  width: 100%;
  display: block;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #fff;
}

.media-card img {
  width: 100%;
  display: block;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #fff;
}

.caption {
  margin: 0.75rem 0 0;
  font-size: 0.92rem;
  color: var(--ink-soft);
}

.stats {
  margin-top: 0.8rem;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.7rem;
}

.stats > div {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.55);
  border-radius: 11px;
  padding: 0.82rem;
}

.num {
  margin: 0;
  font-family: "IBM Plex Serif", serif;
  font-size: 1.7rem;
  color: var(--accent-2);
  font-weight: 700;
}

.label {
  margin: 0.18rem 0 0;
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.table-wrap {
  margin-top: 1rem;
  overflow-x: auto;
}

.table-wrap h3 {
  margin-top: 0;
}

.creation-grid {
  margin-top: 0.85rem;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.72rem;
}

.five-steps {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.training-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.9rem;
  align-items: start;
}

.training-text {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.6);
  padding: 0.8rem;
}

.training-text h3 {
  margin: 0 0 0.45rem;
  font-family: "IBM Plex Serif", serif;
}

.training-text p {
  margin: 0.35rem 0;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  text-align: left;
  padding: 0.58rem;
  border-bottom: 1px solid var(--line);
  font-size: 0.95rem;
}

th {
  color: var(--ink-soft);
  font-weight: 600;
}

pre {
  margin: 0;
  overflow-x: auto;
  background: #1e242d;
  color: #eef4fd;
  border-radius: 12px;
  padding: 1rem;
}

.affiliation-logos {
  margin-top: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
  align-items: center;
}

.affiliation-logos img {
  width: 100%;
  max-height: 58px;
  object-fit: contain;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.75);
  padding: 0.55rem;
}

.footer {
  padding: 2.1rem 0 3rem;
  font-size: 0.92rem;
  color: var(--ink-soft);
  display: flex;
  justify-content: space-between;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

@media (max-width: 860px) {
  nav {
    display: none;
  }

  .cards-3,
  .stats,
  .creation-grid,
  .affiliation-logos,
  .five-steps,
  .training-layout {
    grid-template-columns: 1fr;
  }

  .page-corner-logos img {
    height: 30px;
  }

  .hero {
    padding-top: 3.2rem;
  }
}