:root {
  --primary: #1a5276;
  --accent: #2980b9;
  --bg: #f8f9fa;
  --card-bg: #ffffff;
  --text: #2c3e50;
  --light-text: #7f8c8d;
  --border: #dee2e6;
  --code-bg: #f4f4f4;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; color: var(--text); background: var(--bg); line-height: 1.7; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

header { background: linear-gradient(135deg, var(--primary), var(--accent)); color: white; padding: 3rem 2rem; text-align: center; }
header h1 { font-size: 2.8rem; margin-bottom: 0.3rem; }
header .subtitle { font-size: 1.2rem; opacity: 0.9; font-style: italic; }
header .authors { margin-top: 1rem; font-size: 0.95rem; opacity: 0.85; }

nav { background: var(--primary); padding: 0.6rem 2rem; display: flex; gap: 1.5rem; flex-wrap: wrap; justify-content: center; }
nav a { color: white; font-size: 0.9rem; padding: 0.3rem 0.8rem; border-radius: 4px; }
nav a:hover { background: rgba(255,255,255,0.15); text-decoration: none; }

.container { max-width: 960px; margin: 2rem auto; padding: 0 1.5rem; }
section { margin-bottom: 2.5rem; }
h2 { color: var(--primary); font-size: 1.6rem; margin-bottom: 1rem; border-bottom: 2px solid var(--accent); padding-bottom: 0.3rem; }
h3 { color: var(--primary); font-size: 1.2rem; margin: 1.2rem 0 0.5rem; }

table { width: 100%; border-collapse: collapse; margin: 1rem 0; font-size: 0.9rem; }
th, td { padding: 0.5rem 0.8rem; border: 1px solid var(--border); text-align: left; }
th { background: var(--primary); color: white; }
tr:nth-child(even) { background: #f2f6fa; }
.highlight { font-weight: bold; color: var(--accent); }

.card { background: var(--card-bg); border: 1px solid var(--border); border-radius: 8px; padding: 1.5rem; margin: 1rem 0; box-shadow: 0 2px 4px rgba(0,0,0,0.05); }
.card h3 { margin-top: 0; }

.links-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1rem; margin: 1.5rem 0; }
.link-card { background: var(--card-bg); border: 1px solid var(--border); border-radius: 8px; padding: 1.2rem; text-align: center; transition: transform 0.2s, box-shadow 0.2s; }
.link-card:hover { transform: translateY(-3px); box-shadow: 0 4px 12px rgba(0,0,0,0.1); text-decoration: none; }
.link-card .icon { font-size: 2rem; margin-bottom: 0.5rem; }
.link-card .label { font-weight: bold; color: var(--primary); }
.link-card .desc { font-size: 0.8rem; color: var(--light-text); margin-top: 0.3rem; }

code { background: var(--code-bg); padding: 0.15rem 0.4rem; border-radius: 3px; font-size: 0.88rem; }
pre { background: #1e1e1e; color: #d4d4d4; padding: 1rem; border-radius: 6px; overflow-x: auto; margin: 1rem 0; font-size: 0.85rem; line-height: 1.5; }
pre code { background: none; padding: 0; color: inherit; }

.back-link { display: inline-block; margin: 1rem 0; padding: 0.4rem 1rem; background: var(--accent); color: white; border-radius: 4px; }
.back-link:hover { background: var(--primary); color: white; text-decoration: none; }

.fig { text-align: center; margin: 1.5rem 0; }
.fig img { max-width: 100%; border: 1px solid var(--border); border-radius: 4px; }
.fig .caption { font-size: 0.85rem; color: var(--light-text); margin-top: 0.5rem; }

footer { background: var(--primary); color: white; text-align: center; padding: 1.5rem; margin-top: 3rem; font-size: 0.85rem; }
footer a { color: #aed6f1; }

.ref-list { list-style: none; }
.ref-list li { padding: 0.8rem 0; border-bottom: 1px solid var(--border); }
.ref-list li:last-child { border-bottom: none; }
.ref-id { font-weight: bold; color: var(--accent); margin-right: 0.5rem; }