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

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: "Charter", "Bitstream Charter", "Sitka Text", Cambria, serif;
  color: #2c2c2c;
  background: #fff;
  line-height: 1.7;
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
  font-family: "Segoe UI", system-ui, -apple-system, Helvetica, Arial, sans-serif;
  color: #0C2340;
  line-height: 1.3;
  margin-bottom: 0.5em;
}

h1 { font-size: 2.5rem; font-weight: 700; }
h2 { font-size: 1.75rem; font-weight: 600; border-bottom: 2px solid #0C2340; padding-bottom: 0.3em; margin-top: 2rem; }
h3 { font-size: 1.35rem; font-weight: 600; margin-top: 1.5rem; }
h4 { font-size: 1.05rem; font-weight: 600; }

p { margin-bottom: 1em; }
a { color: #1a5276; }
a:hover { color: #0C2340; }

/* ===== Layout ===== */
.site-container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ===== Site Header ===== */
.site-header {
  background: #0C2340;
  color: #fff;
  padding: 1.5rem 0;
  border-bottom: 3px solid #c99700;
}

.site-header .site-container {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.site-brand {
  display: flex;
  flex-direction: column;
}

.site-brand a { color: #fff; text-decoration: none; }

.site-title {
  font-size: 2rem;
  font-weight: 700;
  color: #fff;
  margin: 0;
  letter-spacing: 0.02em;
}

.site-subtitle {
  font-size: 1.05rem;
  color: #c9d6e3;
  margin: 0;
  font-family: "Charter", "Bitstream Charter", Cambria, serif;
  font-style: italic;
}

.site-affiliation {
  font-size: 0.9rem;
  color: #8da4be;
  margin-top: 0.15rem;
}

/* ===== Navigation ===== */
.site-nav {
  background: #f5f6f8;
  border-bottom: 1px solid #d5d9de;
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-nav .site-container {
  display: flex;
  align-items: center;
  gap: 0;
  overflow-x: auto;
}

.site-nav a {
  display: block;
  padding: 0.6rem 1rem;
  color: #1a5276;
  text-decoration: none;
  font-family: "Segoe UI", system-ui, -apple-system, Helvetica, Arial, sans-serif;
  font-size: 0.88rem;
  font-weight: 500;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: border-color 0.15s, color 0.15s;
}

.site-nav a:hover { color: #0C2340; border-bottom-color: #c99700; }
.site-nav a.active { color: #0C2340; border-bottom-color: #0C2340; font-weight: 600; }

/* ===== Main Content ===== */
.site-main {
  padding: 2rem 0 3rem;
}

/* ===== Page Header ===== */
.page-header {
  margin-bottom: 2rem;
}

.page-header h1 {
  margin-bottom: 0.25rem;
}

.page-header .page-lead {
  font-size: 1.25rem;
  color: #555;
}

/* ===== Sections ===== */
section {
  margin-bottom: 2.5rem;
}

section:last-child {
  margin-bottom: 0;
}

/* ===== Cards ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.25rem;
  margin-top: 1rem;
}

.card {
  background: #fdfdfd;
  border: 1px solid #d5d9de;
  border-radius: 3px;
  padding: 1.25rem;
}

.card h3 {
  margin-top: 0;
  font-size: 1.05rem;
  color: #0C2340;
}

.card p {
  font-size: 0.92rem;
  color: #444;
  margin-bottom: 0.5em;
}

.card p:last-child { margin-bottom: 0; }

/* ===== Tables ===== */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.92rem;
}

thead {
  background: #f0f2f5;
}

th, td {
  text-align: left;
  padding: 0.6rem 0.75rem;
  border: 1px solid #d5d9de;
}

th {
  font-family: "Segoe UI", system-ui, -apple-system, Helvetica, Arial, sans-serif;
  font-weight: 600;
  color: #0C2340;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

/* ===== Status Badges ===== */
.badge {
  display: inline-block;
  font-size: 0.75rem;
  font-family: "Segoe UI", system-ui, sans-serif;
  font-weight: 600;
  padding: 0.15em 0.55em;
  border-radius: 3px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.badge-operational { background: #d4edda; color: #155724; }
.badge-deployed { background: #d1ecf1; color: #0c5460; }
.badge-in-progress { background: #fff3cd; color: #856404; }
.badge-planned { background: #e2e3e5; color: #383d41; }
.badge-development { background: #f3e5f5; color: #4a148c; }

/* ===== Filter Bar ===== */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: flex-end;
  padding: 1rem;
  background: #f5f6f8;
  border: 1px solid #d5d9de;
  border-radius: 3px;
  margin-bottom: 1.5rem;
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.filter-group label {
  font-size: 0.78rem;
  font-family: "Segoe UI", system-ui, sans-serif;
  font-weight: 600;
  color: #0C2340;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.filter-group select {
  font-size: 0.88rem;
  padding: 0.35rem 0.5rem;
  border: 1px solid #bbb;
  border-radius: 3px;
  background: #fff;
  font-family: inherit;
}

/* ===== Definition Lists ===== */
dl.spec-list {
  margin: 1rem 0;
}

dl.spec-list dt {
  font-weight: 600;
  color: #0C2340;
  font-family: "Segoe UI", system-ui, sans-serif;
  font-size: 0.9rem;
  margin-top: 0.75rem;
}

dl.spec-list dd {
  margin-left: 0;
  padding-left: 1rem;
  border-left: 2px solid #d5d9de;
  margin-bottom: 0.5rem;
  font-size: 0.93rem;
}

/* ===== Publication List ===== */
.pub-list {
  list-style: none;
  padding: 0;
}

.pub-list li {
  padding: 0.75rem 0;
  border-bottom: 1px solid #eee;
  font-size: 0.93rem;
}

.pub-list li:last-child { border-bottom: none; }

.pub-list .pub-title {
  font-weight: 600;
  color: #1a5276;
}

.pub-list .pub-authors {
  color: #555;
  font-size: 0.88rem;
}

.pub-list .pub-venue {
  font-style: italic;
  color: #666;
  font-size: 0.86rem;
}

.pub-list .pub-links {
  margin-top: 0.25rem;
  font-size: 0.83rem;
}

.pub-list .pub-links a {
  margin-right: 0.75rem;
}

/* ===== Callout ===== */
.callout {
  background: #f0f4f8;
  border-left: 4px solid #0C2340;
  padding: 1rem 1.25rem;
  margin: 1.25rem 0;
  font-size: 0.93rem;
}

.callout p:last-child { margin-bottom: 0; }

/* ===== Footer ===== */
.site-footer {
  background: #f5f6f8;
  border-top: 1px solid #d5d9de;
  padding: 1.5rem 0;
  font-size: 0.82rem;
  color: #666;
}

.site-footer .site-container {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
}

.site-footer a { color: #1a5276; }

.footer-support {
  font-size: 0.8rem;
  color: #888;
}

/* ===== Responsive ===== */
@media (max-width: 640px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }
  .site-title { font-size: 1.5rem; }
  .card-grid { grid-template-columns: 1fr; }
  .filter-bar { flex-direction: column; }
  .site-nav .site-container { 
    gap: 0; 
    flex-wrap: wrap;
    justify-content: center;
  }
  .site-nav a { padding: 0.5rem 0.7rem; font-size: 0.82rem; }
  .site-footer .site-container { flex-direction: column; }
}