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

:root {
  --blue:    #6b7c2a;
  --blue-dk: #556120;
  --navy:    #1c200f;
  --slate:   #5a6045;
  --light:   #f7f8f2;
  --border:  #dde0ce;
  --accent:  #6b7c2a;
  --radius:  10px;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: #22261a;
  background: #fff;
}

a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ===== NAV ===== */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  padding: 0 2rem;
}

nav .inner {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 52px;
}

nav .brand {
  font-weight: 800;
  font-size: 1.05rem;
  color: var(--navy);
  letter-spacing: -0.01em;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 1.6rem;
}

nav ul a {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--slate);
  transition: color 0.15s;
}

nav ul a:hover { color: var(--blue); text-decoration: none; }

/* ===== HERO ===== */
.hero {
  background: #fff;
  border-bottom: 1px solid var(--border);
  padding: 4rem 2rem 3.5rem;
  text-align: center;
}

.hero .logo-wrap {
  display: flex;
  justify-content: center;
  margin-bottom: 1.8rem;
}

.hero .logo-wrap img {
  height: 140px;
}

.hero h1 {
  font-size: clamp(1.6rem, 3.5vw, 2.3rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--navy);
  max-width: 760px;
  margin: 0 auto 0.7rem;
}

.hero .tagline {
  font-size: 1rem;
  color: var(--slate);
  max-width: 620px;
  margin: 0 auto 1.8rem;
  font-weight: 400;
  line-height: 1.65;
}

/* venue badge */
.venue-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: #f2f4e8;
  border: 1px solid #c8d08a;
  border-radius: 50px;
  padding: 0.28rem 0.9rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--blue);
  margin-bottom: 1.8rem;
}

/* authors */
.authors {
  font-size: 0.92rem;
  color: #3a3e28;
  max-width: 720px;
  margin: 0 auto 0.5rem;
  line-height: 2;
}

.authors a { color: var(--blue); font-weight: 500; }

.authors sup { font-size: 0.68rem; color: var(--slate); }

.affiliations {
  font-size: 0.77rem;
  color: #8a9070;
  max-width: 700px;
  margin: 0 auto 2rem;
  line-height: 1.9;
}

/* resource buttons */
.buttons {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.65rem;
  margin-top: 0.25rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1.1rem;
  border-radius: 8px;
  font-size: 0.87rem;
  font-weight: 600;
  transition: all 0.15s;
  text-decoration: none !important;
  cursor: pointer;
  border: 1.5px solid transparent;
}

.btn-primary {
  background: var(--blue);
  color: #fff;
  border-color: var(--blue);
}
.btn-primary:hover { background: var(--blue-dk); border-color: var(--blue-dk); }

.btn-outline {
  background: #fff;
  color: var(--navy);
  border-color: var(--border);
}
.btn-outline:hover { border-color: #94a3b8; background: var(--light); }

.btn svg { width: 15px; height: 15px; flex-shrink: 0; }

/* ===== SECTION WRAPPER ===== */
section { padding: 4rem 2rem; background: #fff; }

.container {
  max-width: 880px;
  margin: 0 auto;
}

.section-title {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--navy);
  letter-spacing: -0.02em;
  margin-bottom: 1.4rem;
  padding-bottom: 0.5rem;
  border-bottom: 3px solid var(--accent);
  display: inline-block;
}

/* ===== ABSTRACT ===== */
.abstract-text {
  font-size: 0.97rem;
  color: #3a3e28;
  text-align: justify;
  line-height: 1.88;
}

/* ===== METHOD FIGURE ===== */
.fig-wrap {
  margin: 2rem 0;
  text-align: center;
}

.fig-wrap img {
  max-width: 100%;
}

.fig-caption {
  font-size: 0.83rem;
  color: var(--slate);
  margin-top: 0.9rem;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.65;
  text-align: left;
}

.fig-caption strong { color: var(--navy); }

/* ===== RESULTS GRID ===== */
.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.2rem;
  margin-top: 1.8rem;
}

.result-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.3rem 1.2rem;
  border-top: 3px solid var(--accent);
}

.result-card h3 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 0.5rem;
}

.result-card p {
  font-size: 0.86rem;
  color: var(--slate);
  line-height: 1.65;
}

/* ===== METHOD CALLOUT ===== */
.callout {
  background: #f4f6e8;
  border-left: 4px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 1.1rem 1.4rem;
  margin-top: 1.5rem;
  font-size: 0.92rem;
  color: #2e3318;
  line-height: 1.8;
}

/* ===== CITATION ===== */
.citation-block {
  background: var(--navy);
  border-radius: var(--radius);
  padding: 1.4rem 1.6rem;
  position: relative;
  margin-top: 1rem;
}

.citation-block pre {
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 0.8rem;
  color: #a8b07a;
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.75;
  margin: 0;
}

.copy-btn {
  position: absolute;
  top: 0.7rem;
  right: 0.8rem;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 6px;
  color: #94a3b8;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.6rem;
  cursor: pointer;
  transition: all 0.15s;
  font-family: inherit;
}

.copy-btn:hover { background: rgba(255,255,255,0.2); color: #fff; }

/* ===== FOOTER ===== */
footer {
  background: var(--navy);
  color: #7a8060;
  text-align: center;
  padding: 2rem;
  font-size: 0.82rem;
  line-height: 1.9;
}

footer a { color: #a8b07a; }
footer a:hover { color: #fff; }

/* ===== RESPONSIVE ===== */
@media (max-width: 600px) {
  nav ul { gap: 0.9rem; }
  .hero { padding: 3rem 1.2rem 2.5rem; }
  section { padding: 3rem 1.2rem; }
  .hero .logo-wrap img { height: 100px; }
}