/*
 * FONTS: Self-hosted for DSGVO compliance.
 * Download from https://fonts.google.com and place .woff2 files in /fonts/
 * See README.md for instructions.
 */
@font-face { font-family: 'DM Serif Display'; font-style: normal; font-weight: 400; font-display: swap; src: url('fonts/DMSerifDisplay-Regular.woff2') format('woff2'), local('DM Serif Display'); }
@font-face { font-family: 'IBM Plex Sans'; font-style: normal; font-weight: 300; font-display: swap; src: url('fonts/IBMPlexSans-Light.woff2') format('woff2'), local('IBM Plex Sans Light'); }
@font-face { font-family: 'IBM Plex Sans'; font-style: normal; font-weight: 400; font-display: swap; src: url('fonts/IBMPlexSans-Regular.woff2') format('woff2'), local('IBM Plex Sans'); }
@font-face { font-family: 'IBM Plex Sans'; font-style: normal; font-weight: 500; font-display: swap; src: url('fonts/IBMPlexSans-Medium.woff2') format('woff2'), local('IBM Plex Sans Medium'); }
@font-face { font-family: 'IBM Plex Sans'; font-style: normal; font-weight: 600; font-display: swap; src: url('fonts/IBMPlexSans-SemiBold.woff2') format('woff2'), local('IBM Plex Sans SemiBold'); }
@font-face { font-family: 'IBM Plex Mono'; font-style: normal; font-weight: 400; font-display: swap; src: url('fonts/IBMPlexMono-Regular.woff2') format('woff2'), local('IBM Plex Mono'); }
@font-face { font-family: 'IBM Plex Mono'; font-style: normal; font-weight: 500; font-display: swap; src: url('fonts/IBMPlexMono-Medium.woff2') format('woff2'), local('IBM Plex Mono Medium'); }

:root {
  --color-bg: #FAFAF7;
  --color-surface: #FFFFFF;
  --color-text: #1A1A1A;
  --color-text-secondary: #555555;
  --color-accent: #2B5C8A;
  --color-accent-light: #E8F0F8;
  --color-accent-dark: #1A3D5C;
  --color-border: #E0DED8;
  --color-risk-safe: #3A8A5C;
  --color-risk-transition: #C4862B;
  --color-risk-high: #B5403A;
  --color-risk-safe-bg: #EBF5EF;
  --color-risk-transition-bg: #FFF5E6;
  --color-risk-high-bg: #FBEAEA;
  --font-display: 'DM Serif Display', Georgia, serif;
  --font-body: 'IBM Plex Sans', -apple-system, sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;
  --max-width: 860px;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 3rem;
  --space-xl: 5rem;
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

/* ─── NAV ─── */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250,250,247,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  padding: 0.8rem 2rem;
}
nav .nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
nav .logo {
  font-family: var(--font-display);
  font-size: 1.15rem;
  color: var(--color-accent-dark);
  text-decoration: none;
}
nav .logo span { color: var(--color-accent); }
nav ul { list-style: none; display: flex; gap: 1.8rem; }
nav a {
  text-decoration: none;
  color: var(--color-text-secondary);
  font-size: 0.88rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: color 0.2s;
}
nav a:hover { color: var(--color-accent); }
nav a.active { color: var(--color-accent); }

/* Hamburger toggle */
.nav-toggle {
  display: none; background: none; border: none; cursor: pointer;
  padding: 0.4rem; flex-direction: column; gap: 4px;
}
.nav-toggle span {
  display: block; width: 20px; height: 2px;
  background: var(--color-text); transition: all 0.3s;
}
nav.open .nav-toggle span:nth-child(1) { transform: rotate(45deg) translate(4px, 4px); }
nav.open .nav-toggle span:nth-child(2) { opacity: 0; }
nav.open .nav-toggle span:nth-child(3) { transform: rotate(-45deg) translate(4px, -4px); }

/* ─── SECTIONS ─── */
section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-xl) 2rem;
}
section + section { border-top: 1px solid var(--color-border); }

h1 {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  line-height: 1.15;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}
h2 {
  font-family: var(--font-display);
  font-size: 1.6rem;
  color: var(--color-text);
  margin-bottom: var(--space-md);
}
h3 {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1rem;
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}
p.lead {
  font-size: 1.15rem;
  color: var(--color-text-secondary);
  font-weight: 300;
  max-width: 600px;
  line-height: 1.7;
}
.subtitle {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

/* ─── HERO ─── */
#hero { padding-top: var(--space-xl); padding-bottom: var(--space-lg); }
#hero .affiliations {
  margin-top: var(--space-md);
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
}
#hero .affiliations span {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  background: var(--color-accent-light);
  border-radius: 4px;
  margin: 0.15rem 0.3rem 0.15rem 0;
  font-size: 0.82rem;
}

/* ─── RESEARCH ─── */
.research-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
}
.research-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: var(--space-md);
}
.research-item:last-child { grid-column: 1 / -1; }
.research-icon { font-size: 1.4rem; margin-bottom: 0.4rem; line-height: 1; }
.research-item h3 { font-size: 0.95rem; margin-bottom: 0.5rem; }
.research-item p { font-size: 0.88rem; color: var(--color-text-secondary); line-height: 1.65; }

/* ─── NETWORK ─── */
.network-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
}
.network-node {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1rem var(--space-md);
}
.network-node h3 {
  font-size: 0.92rem;
  margin-bottom: 0.3rem;
}
.network-node .affil {
  font-size: 0.8rem;
  color: var(--color-accent);
  font-weight: 500;
  margin-bottom: 0.4rem;
}
.network-node p {
  font-size: 0.82rem;
  color: var(--color-text-secondary);
  line-height: 1.55;
}

/* ─── PUBLICATIONS ─── */
.pub-list { list-style: none; }
.pub-item { padding: var(--space-sm) 0; border-bottom: 1px solid var(--color-border); }
.pub-item:last-child { border-bottom: none; }
.pub-year { font-family: var(--font-mono); font-size: 0.75rem; color: var(--color-accent); font-weight: 500; }
.pub-title { font-weight: 500; font-size: 0.95rem; margin: 0.2rem 0; line-height: 1.5; }
.pub-title a { color: var(--color-text); text-decoration: none; transition: color 0.2s; }
.pub-title a:hover { color: var(--color-accent); }
.pub-authors { font-size: 0.82rem; color: var(--color-text-secondary); line-height: 1.5; }
.pub-journal { font-size: 0.82rem; font-style: italic; color: var(--color-text-secondary); }

/* ─── ABOUT ─── */
#about p { color: var(--color-text-secondary); font-size: 0.95rem; max-width: 640px; margin-bottom: var(--space-sm); }
#about p:last-of-type { margin-bottom: 0; }
.contact-links {
  display: flex; gap: 1.2rem; flex-wrap: wrap; margin-top: var(--space-md);
}
.contact-links a {
  font-family: var(--font-mono); font-size: 0.82rem; color: var(--color-accent);
  text-decoration: none; padding: 0.3rem 0.7rem; border: 1px solid var(--color-accent);
  border-radius: 4px; transition: all 0.2s;
}
.contact-links a:hover { background: var(--color-accent); color: white; }

/* ─── CALCULATOR ─── */
.calc-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: var(--space-md) var(--space-md) var(--space-sm);
  margin-bottom: var(--space-md);
}
.calc-card h3 {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
  padding-bottom: var(--space-xs);
  border-bottom: 1px solid var(--color-border);
}
.consistency-row {
  display: grid;
  grid-template-columns: 120px 1fr 1fr 1fr;
  gap: 0.6rem;
  align-items: center;
  margin-bottom: 0.5rem;
}
.consistency-row.header {
  font-size: 0.75rem; font-weight: 600; color: var(--color-text-secondary);
  text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 0.8rem;
}
.consistency-row label { font-size: 0.9rem; font-weight: 500; }
.consistency-row input, .consistency-row select {
  font-family: var(--font-mono); font-size: 0.9rem; padding: 0.45rem 0.5rem;
  border: 1px solid var(--color-border); border-radius: 5px;
  background: var(--color-bg); color: var(--color-text); text-align: center; transition: border-color 0.2s;
}
.consistency-row input:focus, .consistency-row select:focus {
  outline: none; border-color: var(--color-accent); box-shadow: 0 0 0 2px var(--color-accent-light);
}
.consistency-row input::placeholder { color: #bbb; }

.results-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; margin-bottom: var(--space-md); }
.result-box {
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: 8px; padding: 1rem; text-align: center;
}
.result-box .label {
  font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--color-text-secondary); margin-bottom: 0.3rem;
}
.result-box .value { font-family: var(--font-mono); font-size: 1.8rem; font-weight: 500; color: var(--color-accent-dark); }
.result-box .value.empty { color: #ccc; font-size: 1.2rem; }
.result-box .sub { font-size: 0.75rem; color: var(--color-text-secondary); margin-top: 0.2rem; }

.interpretation {
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: 8px; padding: var(--space-md); margin-bottom: var(--space-md);
}
.interpretation h3 {
  font-family: var(--font-mono); font-size: 0.75rem; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--color-accent); margin-bottom: var(--space-sm);
}
.interp-row { display: flex; align-items: center; gap: 0.8rem; padding: 0.5rem 0; border-bottom: 1px solid var(--color-border); }
.interp-row:last-child { border-bottom: none; }
.interp-badge {
  display: inline-block; padding: 0.2rem 0.7rem; border-radius: 4px;
  font-size: 0.78rem; font-weight: 600; min-width: 90px; text-align: center;
}
.interp-badge.safe { background: var(--color-risk-safe-bg); color: var(--color-risk-safe); }
.interp-badge.transition { background: var(--color-risk-transition-bg); color: var(--color-risk-transition); }
.interp-badge.risk { background: var(--color-risk-high-bg); color: var(--color-risk-high); }
.interp-badge.neutral { background: #f0f0ee; color: #666; }
.interp-text { font-size: 0.88rem; color: var(--color-text-secondary); }

.formula-note {
  margin-top: var(--space-md); padding: var(--space-sm);
  background: var(--color-accent-light); border-radius: 6px;
  font-size: 0.82rem; color: var(--color-text-secondary); line-height: 1.7;
}
.formula-note code {
  font-family: var(--font-mono); background: rgba(43,92,138,0.08);
  padding: 0.1rem 0.35rem; border-radius: 3px; font-size: 0.82rem;
}
.disclaimer {
  margin-top: var(--space-sm); padding: var(--space-sm);
  border-left: 3px solid var(--color-risk-transition);
  font-size: 0.8rem; color: var(--color-text-secondary); line-height: 1.6;
}

/* ─── BLOG ─── */
.blog-list { list-style: none; }
.blog-item {
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--color-border);
}
.blog-item:last-child { border-bottom: none; }
.blog-date {
  font-family: var(--font-mono); font-size: 0.75rem;
  color: var(--color-accent); font-weight: 500;
}
.blog-tag {
  display: inline-block; font-family: var(--font-mono); font-size: 0.68rem;
  padding: 0.15rem 0.5rem; border-radius: 3px;
  background: var(--color-accent-light); color: var(--color-accent);
  margin-left: 0.5rem; vertical-align: middle; text-transform: uppercase; letter-spacing: 0.05em;
}
.blog-title {
  font-family: var(--font-display); font-size: 1.15rem;
  margin: 0.3rem 0 0.4rem; line-height: 1.4;
}
.blog-title a { color: var(--color-text); text-decoration: none; transition: color 0.2s; }
.blog-title a:hover { color: var(--color-accent); }
.blog-excerpt {
  font-size: 0.9rem; color: var(--color-text-secondary); line-height: 1.6; max-width: 640px;
}

/* ─── FUNDING ─── */
.funding-item {
  display: flex; align-items: flex-start; gap: 1rem;
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: 8px; padding: var(--space-md);
}
.funding-badge {
  font-family: var(--font-mono); font-size: 0.72rem; font-weight: 600;
  letter-spacing: 0.08em; text-transform: uppercase;
  padding: 0.25rem 0.6rem; border-radius: 4px;
  background: var(--color-accent-light); color: var(--color-accent);
  white-space: nowrap;
}
.funding-item div { font-size: 0.92rem; line-height: 1.6; }

/* ─── FOOTER ─── */
footer {
  max-width: var(--max-width); margin: 0 auto;
  padding: var(--space-lg) 2rem var(--space-md);
  border-top: 1px solid var(--color-border);
  font-size: 0.78rem; color: #aaa; text-align: center;
}

/* ─── RESPONSIVE ─── */
@media (max-width: 700px) {
  .nav-toggle { display: flex; }
  nav ul {
    display: none; position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; gap: 0; background: var(--color-bg);
    border-bottom: 1px solid var(--color-border); padding: 0.5rem 2rem 1rem;
  }
  nav.open ul { display: flex; }
  nav ul li a { display: block; padding: 0.5rem 0; }
  nav a { font-size: 0.9rem; }
  nav { position: relative; }
  .consistency-row { grid-template-columns: 100px 1fr 1fr 1fr; gap: 0.4rem; }
  .consistency-row label { font-size: 0.82rem; }
  .results-grid { grid-template-columns: 1fr; }
  .research-grid { grid-template-columns: 1fr; }
  .research-item:last-child { grid-column: auto; }
  .network-grid { grid-template-columns: 1fr; }
  section { padding: var(--space-lg) 1.2rem; }
}
@media (max-width: 480px) {
  .consistency-row { grid-template-columns: 80px 1fr 1fr 1fr; }
}