/* ============================================================
   National MCP-PAI Oncology Trials - GitHub Pages Stylesheet
   Version 1.2.0 | Light-mode only | Clinical design system
   ============================================================ */

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

:root {
  --color-primary: #1a5276;
  --color-primary-light: #2980b9;
  --color-primary-dark: #0e2f44;
  --color-accent: #27ae60;
  --color-accent-light: #2ecc71;
  --color-warning: #e67e22;
  --color-danger: #c0392b;
  --color-text: #2c3e50;
  --color-text-light: #5d6d7e;
  --color-bg: #ffffff;
  --color-bg-alt: #f8f9fa;
  --color-bg-section: #eef2f7;
  --color-border: #d5dbdb;
  --color-border-light: #e8ecef;
  --color-code-bg: #f4f6f8;
  --font-sans: "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SFMono-Regular", "Cascadia Code", "Fira Code", Consolas, monospace;
  --max-width: 1140px;
  --radius: 8px;
  --shadow: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-hover: 0 4px 16px rgba(0,0,0,0.12);
  --transition: 0.25s ease;
}

html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; }
h1 { font-size: 2.2rem; }
h2 { font-size: 1.6rem; margin-bottom: 0.75rem; color: var(--color-primary); }
h3 { font-size: 1.25rem; margin-bottom: 0.5rem; color: var(--color-primary-dark); }
h4 { font-size: 1.05rem; margin-bottom: 0.4rem; }
p  { margin-bottom: 1rem; }
a  { color: var(--color-primary-light); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-primary-dark); text-decoration: underline; }

/* ---------- Layout ---------- */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 1.5rem; }

/* ---------- Navigation ---------- */
.site-nav {
  position: sticky; top: 0; z-index: 100;
  background: var(--color-primary-dark);
  border-bottom: 3px solid var(--color-accent);
  padding: 0;
}
.site-nav .container {
  display: flex; align-items: center; justify-content: space-between;
  padding-top: 0.5rem; padding-bottom: 0.5rem;
}
.site-nav .nav-brand {
  color: #fff; font-weight: 700; font-size: 0.95rem;
  white-space: nowrap; text-decoration: none;
}
.site-nav .nav-brand:hover { color: var(--color-accent-light); text-decoration: none; }
.nav-links { display: flex; gap: 0.25rem; flex-wrap: wrap; justify-content: flex-end; }
.nav-links a {
  color: #ccd9e2; font-size: 0.78rem; padding: 0.3rem 0.55rem;
  border-radius: 4px; text-decoration: none; transition: all var(--transition);
  white-space: nowrap;
}
.nav-links a:hover, .nav-links a.active {
  color: #fff; background: rgba(255,255,255,0.12); text-decoration: none;
}

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 60%, #1a6e5e 100%);
  color: #fff; padding: 3.5rem 0 3rem; text-align: center;
}
.hero h1 { font-size: 2rem; margin-bottom: 0.75rem; letter-spacing: -0.01em; }
.hero .subtitle { font-size: 1.1rem; opacity: 0.92; margin-bottom: 0.5rem; }
.hero .author-info { margin-top: 1.25rem; font-size: 0.95rem; opacity: 0.9; line-height: 1.8; }
.hero .author-info a { color: #7ec8e3; }
.hero .author-info a:hover { color: #a3dff0; }
.hero .badges { display: flex; flex-wrap: wrap; gap: 0.5rem; justify-content: center; margin-top: 1.25rem; }
.hero .badges img { height: 22px; }
.hero .date-line { margin-top: 1rem; font-size: 0.85rem; opacity: 0.75; }

/* ORCID icon inline */
.orcid-icon {
  display: inline-block; width: 16px; height: 16px;
  vertical-align: -2px; margin-left: 3px;
}

/* ---------- Sections ---------- */
.section { padding: 3rem 0; }
.section:nth-child(even) { background: var(--color-bg-alt); }
.section-header { text-align: center; margin-bottom: 2rem; }
.section-header p { color: var(--color-text-light); max-width: 700px; margin: 0.5rem auto 0; }

/* ---------- Cards ---------- */
.card {
  background: var(--color-bg); border: 1px solid var(--color-border-light);
  border-radius: var(--radius); padding: 1.5rem; margin-bottom: 1rem;
  box-shadow: var(--shadow); transition: box-shadow var(--transition);
}
.card:hover { box-shadow: var(--shadow-hover); }
.card h3 { color: var(--color-primary); }

.card-grid {
  display: grid; gap: 1rem;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
}

/* ---------- Server Cards ---------- */
.server-card {
  border-left: 4px solid var(--color-primary);
  background: var(--color-bg);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  margin-bottom: 0.75rem;
  box-shadow: var(--shadow);
}
.server-card .server-name {
  font-weight: 700; font-size: 1.05rem;
  color: var(--color-primary-dark); margin-bottom: 0.25rem;
}
.server-card .server-id { font-family: var(--font-mono); font-size: 0.85rem; color: var(--color-text-light); }
.server-card .tool-count {
  display: inline-block; background: var(--color-primary);
  color: #fff; font-size: 0.75rem; padding: 0.15rem 0.6rem;
  border-radius: 12px; margin-left: 0.5rem; vertical-align: middle;
}
.server-card .level-badge {
  display: inline-block; background: var(--color-accent);
  color: #fff; font-size: 0.72rem; padding: 0.15rem 0.5rem;
  border-radius: 12px; margin-left: 0.35rem; vertical-align: middle;
}
.server-card ul { margin: 0.5rem 0 0 1.2rem; }
.server-card li { font-size: 0.88rem; margin-bottom: 0.2rem; }
.server-card code { font-family: var(--font-mono); font-size: 0.82rem; background: var(--color-code-bg); padding: 0.1rem 0.35rem; border-radius: 3px; }

/* Color-coded server borders */
.server-card[data-server="authz"]      { border-left-color: #2980b9; }
.server-card[data-server="fhir"]       { border-left-color: #27ae60; }
.server-card[data-server="dicom"]      { border-left-color: #8e44ad; }
.server-card[data-server="ledger"]     { border-left-color: #e67e22; }
.server-card[data-server="provenance"] { border-left-color: #c0392b; }

/* ---------- Code Blocks ---------- */
pre {
  background: var(--color-code-bg); border: 1px solid var(--color-border);
  border-radius: var(--radius); padding: 1rem 1.25rem;
  overflow-x: auto; font-family: var(--font-mono); font-size: 0.82rem;
  line-height: 1.6; margin-bottom: 1rem; white-space: pre; word-wrap: normal;
}
code {
  font-family: var(--font-mono); font-size: 0.88em;
  background: var(--color-code-bg); padding: 0.15rem 0.35rem;
  border-radius: 3px;
}
pre code { background: none; padding: 0; font-size: inherit; }

/* ---------- Text Diagrams ---------- */
.text-diagram {
  background: #f9fbfd; border: 1px solid var(--color-border);
  border-radius: var(--radius); padding: 1.25rem;
  overflow-x: auto; margin-bottom: 1.25rem;
}
.text-diagram pre {
  background: none; border: none; padding: 0; margin: 0;
  font-size: 0.78rem; line-height: 1.5;
  color: var(--color-primary-dark);
}
.text-diagram .diagram-caption {
  text-align: center; font-size: 0.82rem; font-style: italic;
  color: var(--color-text-light); margin-top: 0.75rem; padding-top: 0.5rem;
  border-top: 1px solid var(--color-border-light);
}

/* ---------- Tables ---------- */
table {
  width: 100%; border-collapse: collapse; margin-bottom: 1.25rem;
  font-size: 0.9rem;
}
thead { background: var(--color-primary-dark); color: #fff; }
th { padding: 0.65rem 0.75rem; text-align: left; font-weight: 600; font-size: 0.85rem; }
td { padding: 0.55rem 0.75rem; border-bottom: 1px solid var(--color-border-light); }
tbody tr:nth-child(even) { background: var(--color-bg-alt); }
tbody tr:hover { background: #e8f0fe; }

/* ---------- Stats Grid ---------- */
.stats-grid {
  display: grid; gap: 1rem;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
}
.stat-card {
  background: var(--color-bg); border: 1px solid var(--color-border-light);
  border-radius: var(--radius); padding: 1.25rem; text-align: center;
  box-shadow: var(--shadow);
}
.stat-card .stat-value {
  font-size: 2rem; font-weight: 800; color: var(--color-primary);
  display: block; line-height: 1.2;
}
.stat-card .stat-label {
  font-size: 0.82rem; color: var(--color-text-light); margin-top: 0.25rem;
}

/* ---------- Conformance Levels ---------- */
.conformance-level {
  display: flex; align-items: flex-start; gap: 1rem;
  padding: 1rem 1.25rem; border-radius: var(--radius);
  margin-bottom: 0.75rem; background: var(--color-bg);
  border: 1px solid var(--color-border-light);
  box-shadow: var(--shadow); cursor: pointer;
  transition: all var(--transition);
}
.conformance-level:hover { box-shadow: var(--shadow-hover); transform: translateY(-1px); }
.conformance-level .level-num {
  flex-shrink: 0; width: 42px; height: 42px;
  border-radius: 50%; background: var(--color-primary);
  color: #fff; display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 1.1rem;
}
.conformance-level .level-body h4 { margin-bottom: 0.2rem; }
.conformance-level .level-body p { font-size: 0.88rem; color: var(--color-text-light); margin-bottom: 0; }
.conformance-level .level-detail {
  display: none; margin-top: 0.5rem; font-size: 0.85rem;
  padding-top: 0.5rem; border-top: 1px solid var(--color-border-light);
}
.conformance-level.expanded .level-detail { display: block; }

/* Level colors */
.conformance-level[data-level="1"] .level-num { background: #2980b9; }
.conformance-level[data-level="2"] .level-num { background: #27ae60; }
.conformance-level[data-level="3"] .level-num { background: #8e44ad; }
.conformance-level[data-level="4"] .level-num { background: #e67e22; }
.conformance-level[data-level="5"] .level-num { background: #c0392b; }

/* ---------- Safety Module Cards ---------- */
.safety-card {
  background: var(--color-bg); border: 1px solid var(--color-border-light);
  border-radius: var(--radius); padding: 1.25rem;
  border-top: 3px solid var(--color-danger);
  box-shadow: var(--shadow);
}
.safety-card h4 { color: var(--color-danger); margin-bottom: 0.4rem; }
.safety-card .safety-file {
  font-family: var(--font-mono); font-size: 0.78rem;
  color: var(--color-text-light); margin-bottom: 0.5rem;
}
.safety-card .state-machine {
  display: flex; flex-wrap: wrap; gap: 0.3rem; margin-top: 0.5rem;
}
.safety-card .state-badge {
  background: var(--color-bg-section); border: 1px solid var(--color-border);
  border-radius: 4px; padding: 0.15rem 0.5rem; font-size: 0.72rem;
  font-family: var(--font-mono); color: var(--color-primary-dark);
}

/* ---------- Topology Map ---------- */
.topology-visual {
  background: var(--color-bg); border: 1px solid var(--color-border);
  border-radius: var(--radius); padding: 2rem; text-align: center;
}
.topology-tier {
  margin-bottom: 1.5rem; position: relative;
}
.topology-tier::after {
  content: ""; display: block; width: 2px; height: 24px;
  background: var(--color-primary); margin: 0.75rem auto 0;
}
.topology-tier:last-child::after { display: none; }
.topology-tier .tier-label {
  font-weight: 700; font-size: 0.9rem; color: var(--color-primary-dark);
  margin-bottom: 0.5rem;
}
.region-cards {
  display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap;
}
.region-card {
  background: var(--color-bg-alt); border: 1px solid var(--color-border-light);
  border-radius: var(--radius); padding: 1rem 1.5rem; min-width: 200px;
  flex: 1; max-width: 280px;
}
.region-card h4 { color: var(--color-primary); font-size: 0.95rem; margin-bottom: 0.35rem; }
.region-card .region-stat { font-size: 0.85rem; color: var(--color-text-light); }
.region-card .region-stat strong { color: var(--color-text); }

/* ---------- Roadmap ---------- */
.roadmap-item {
  display: flex; gap: 1rem; margin-bottom: 1rem;
  padding: 1rem 1.25rem; background: var(--color-bg);
  border-radius: var(--radius); border: 1px solid var(--color-border-light);
  box-shadow: var(--shadow);
}
.roadmap-item .roadmap-icon {
  flex-shrink: 0; width: 38px; height: 38px;
  border-radius: 50%; background: var(--color-primary);
  color: #fff; display: flex; align-items: center; justify-content: center;
  font-size: 1rem;
}
.roadmap-item h4 { margin-bottom: 0.2rem; }
.roadmap-item p { font-size: 0.88rem; color: var(--color-text-light); margin-bottom: 0; }

/* ---------- Disclaimer ---------- */
.disclaimer-box {
  background: #fef9e7; border: 1px solid #f9e79f; border-left: 4px solid var(--color-warning);
  border-radius: var(--radius); padding: 1.25rem 1.5rem; margin-bottom: 1.25rem;
}
.disclaimer-box h3 { color: var(--color-warning); margin-bottom: 0.5rem; }
.disclaimer-box ul { margin: 0.5rem 0 0 1.2rem; }
.disclaimer-box li { margin-bottom: 0.3rem; font-size: 0.9rem; }

.not-box {
  background: #fdedec; border: 1px solid #f5b7b1; border-left: 4px solid var(--color-danger);
  border-radius: var(--radius); padding: 1.25rem 1.5rem; margin-bottom: 1.25rem;
}
.not-box h3 { color: var(--color-danger); margin-bottom: 0.5rem; }

.needed-box {
  background: #eaf2f8; border: 1px solid #aed6f1; border-left: 4px solid var(--color-primary-light);
  border-radius: var(--radius); padding: 1.25rem 1.5rem; margin-bottom: 1.25rem;
}
.needed-box h3 { color: var(--color-primary-light); margin-bottom: 0.5rem; }

/* ---------- Citation ---------- */
.citation-block {
  background: var(--color-code-bg); border: 1px solid var(--color-border);
  border-radius: var(--radius); padding: 1.25rem;
  font-family: var(--font-mono); font-size: 0.82rem;
  overflow-x: auto; white-space: pre-wrap; word-wrap: break-word;
}

/* ---------- Tabs ---------- */
.tab-group { margin-bottom: 1.5rem; }
.tab-buttons {
  display: flex; gap: 0; border-bottom: 2px solid var(--color-border);
  margin-bottom: 1rem; flex-wrap: wrap;
}
.tab-btn {
  padding: 0.5rem 1rem; border: none; background: none;
  font-size: 0.85rem; color: var(--color-text-light);
  cursor: pointer; border-bottom: 2px solid transparent;
  margin-bottom: -2px; transition: all var(--transition);
  font-family: var(--font-sans);
}
.tab-btn:hover { color: var(--color-primary); }
.tab-btn.active {
  color: var(--color-primary); border-bottom-color: var(--color-primary);
  font-weight: 600;
}
.tab-content { display: none; }
.tab-content.active { display: block; }

/* ---------- Process Diagram Section ---------- */
.process-section {
  margin-bottom: 2rem; padding: 1.5rem;
  background: var(--color-bg); border: 1px solid var(--color-border-light);
  border-radius: var(--radius); box-shadow: var(--shadow);
}
.process-section h3 {
  display: flex; align-items: center; gap: 0.5rem;
  margin-bottom: 1rem;
}
.process-num {
  display: inline-flex; width: 28px; height: 28px;
  border-radius: 50%; background: var(--color-primary);
  color: #fff; align-items: center; justify-content: center;
  font-size: 0.8rem; font-weight: 700; flex-shrink: 0;
}
.process-source {
  font-family: var(--font-mono); font-size: 0.78rem;
  color: var(--color-text-light); margin-bottom: 0.75rem;
}

/* ---------- Simulator ---------- */
.sim-controls {
  display: flex; gap: 0.75rem; flex-wrap: wrap;
  margin-bottom: 1rem; align-items: center;
}
.sim-btn {
  padding: 0.45rem 1rem; border: 1px solid var(--color-primary);
  background: var(--color-primary); color: #fff;
  border-radius: 5px; cursor: pointer; font-size: 0.85rem;
  font-family: var(--font-sans); transition: all var(--transition);
}
.sim-btn:hover { background: var(--color-primary-dark); }
.sim-btn.outline {
  background: transparent; color: var(--color-primary);
}
.sim-btn.outline:hover { background: var(--color-primary); color: #fff; }
.sim-output {
  background: var(--color-code-bg); border: 1px solid var(--color-border);
  border-radius: var(--radius); padding: 1rem;
  font-family: var(--font-mono); font-size: 0.8rem;
  max-height: 350px; overflow-y: auto; line-height: 1.5;
}

/* ---------- Back to Top ---------- */
.back-to-top {
  position: fixed; bottom: 2rem; right: 2rem;
  width: 40px; height: 40px; border-radius: 50%;
  background: var(--color-primary); color: #fff;
  border: none; cursor: pointer; font-size: 1.1rem;
  box-shadow: var(--shadow); display: none;
  align-items: center; justify-content: center;
  transition: all var(--transition); z-index: 50;
}
.back-to-top.visible { display: flex; }
.back-to-top:hover { background: var(--color-primary-dark); transform: translateY(-2px); }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-primary-dark); color: #ccd9e2;
  padding: 2rem 0; text-align: center; font-size: 0.85rem;
}
.site-footer a { color: #7ec8e3; }
.site-footer a:hover { color: #a3dff0; }
.site-footer .footer-links { margin-bottom: 0.75rem; }
.site-footer .footer-links a { margin: 0 0.75rem; }

/* ---------- Lists ---------- */
.content-list { margin: 0.5rem 0 1rem 1.25rem; }
.content-list li { margin-bottom: 0.35rem; font-size: 0.92rem; }

/* ---------- Two-column layout ---------- */
.two-col {
  display: grid; gap: 1.5rem;
  grid-template-columns: 1fr 1fr;
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .hero h1 { font-size: 1.5rem; }
  .nav-links { display: none; }
  .two-col { grid-template-columns: 1fr; }
  .card-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .region-cards { flex-direction: column; align-items: center; }
  h2 { font-size: 1.35rem; }
  .container { padding: 0 1rem; }
}
@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .stat-card .stat-value { font-size: 1.5rem; }
}

/* ---------- Utility ---------- */
.text-center { text-align: center; }
.text-muted { color: var(--color-text-light); }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); border: 0;
}