/* -----------------------------------------------
   PershingLab — Stanford Medicine
   Baseten-inspired: dark hero, clean sections, Inter
   ----------------------------------------------- */

:root {
  --color-bg: #fff;
  --color-bg-alt: #f5f5f5;
  --color-text: #0a0a0a;
  --color-text-muted: #737373;
  --color-text-hero: #fff;
  --color-accent: #8C1515;
  --color-accent-hover: #700f0f;
  /* Green accent (rgb(25, 231, 110)) */
  --color-green: rgb(25, 231, 110);
  --color-green-hover: #2ef57a;
  --color-border: #e5e5e5;
  --color-dark-bg: #0a0a0a;
  --color-dark-surface: #171717;
  /* Yellow/cream text on dark (readable on black) */
  --color-yellow: #f5edc8;
  --color-yellow-muted: #c9bf8a;
  --color-yellow-dim: #a89f6e;

  --font-heading: "Inter", system-ui, sans-serif;
  --font-body: "Inter", system-ui, sans-serif;

  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  --space-5xl: 8rem;
  --space-6xl: 10rem;

  --container: min(94vw, 1200px);
  --container-narrow: min(94vw, 720px);
  --header-h: 4rem;
  --radius-card: 12px;
  --radius-btn: 8px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --shadow-soft: 0 2px 12px rgba(0, 0, 0, 0.04);
  --shadow-soft-hover: 0 8px 28px rgba(0, 0, 0, 0.06);
}

*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-h);
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1.0625rem;
  font-weight: 400;
  line-height: 1.65;
  color: var(--color-yellow);
  background: var(--color-dark-bg);
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-green);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover {
  color: var(--color-green-hover);
}

/* ----- Header: matches hero (dark) ----- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  background: var(--color-dark-bg);
  border-bottom: 1px solid rgba(245, 237, 200, 0.1);
  transition: box-shadow var(--transition), border-color var(--transition);
}
.site-header.is-scrolled {
  border-bottom-color: rgba(245, 237, 200, 0.15);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}
.site-header--light .logo {
  color: var(--color-yellow);
}
.site-header--light .logo:hover {
  color: var(--color-yellow);
  opacity: 0.9;
}
.site-header--light .logo-org {
  color: var(--color-yellow-muted);
}
.site-header--light .nav-link {
  color: var(--color-yellow-muted);
  font-weight: 500;
}
.site-header--light .nav-link:hover {
  color: var(--color-yellow);
}
.site-header--light .nav-chevron {
  opacity: 0.7;
  font-size: 0.6em;
  vertical-align: middle;
  margin-left: 2px;
  color: var(--color-yellow-muted);
}
.site-header--light .header-link {
  color: var(--color-yellow-muted);
  font-size: 0.9375rem;
  font-weight: 500;
}
.site-header--light .header-link:hover {
  color: var(--color-yellow);
}
.site-header--light .header-cta {
  background: var(--color-green);
  color: var(--color-dark-bg);
  border-color: var(--color-green);
}
.site-header--light .header-cta:hover {
  background: var(--color-green-hover);
  color: var(--color-dark-bg);
  border-color: var(--color-green-hover);
}
.site-header--light .nav-toggle span {
  background: var(--color-yellow);
}
.site-header--light .nav-toggle:hover {
  background: rgba(245, 237, 200, 0.12);
}

.header-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-2xl);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-xl);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  flex-shrink: 0;
}
.header-link {
  white-space: nowrap;
}

/* Logo: left-aligned */
.logo {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  justify-content: center;
  color: var(--color-text);
  font-family: var(--font-heading);
  font-weight: 700;
  min-height: 2.25rem;
  transition: opacity var(--transition);
}
.logo:hover {
  color: var(--color-text);
}
.logo-lab {
  font-size: 1.125rem;
  line-height: 1.25;
  letter-spacing: -0.02em;
}
.logo-org {
  font-family: var(--font-body);
  font-size: 0.625rem;
  font-weight: 500;
  color: var(--color-text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-top: 0.125rem;
}

/* Nav: Chili Piper-style with dropdowns */
.nav {
  margin-left: auto;
  flex: 0 0 auto;
}
.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 0;
}
.nav-item {
  position: relative;
  display: flex;
  align-items: center;
}
.nav-link {
  position: relative;
  display: flex;
  align-items: center;
  padding: var(--space-sm) var(--space-md);
  font-size: 0.9375rem;
  letter-spacing: 0.01em;
  transition: color var(--transition);
}
.nav-link::after {
  content: "";
  position: absolute;
  left: var(--space-md);
  right: var(--space-md);
  bottom: 2px;
  height: 2px;
  background: var(--color-green);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.25s var(--ease-out);
}
.nav-link:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* Dropdown (Chili Piper-style) */
.dropdown {
  list-style: none;
  margin: 0;
  padding: var(--space-sm) 0;
  min-width: 200px;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-soft-hover);
  position: absolute;
  top: 100%;
  left: 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity var(--transition), visibility var(--transition), transform var(--transition);
  z-index: 50;
}
.has-dropdown:hover .dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.dropdown li {
  display: block;
}
.dropdown a {
  display: block;
  padding: var(--space-sm) var(--space-lg);
  font-size: 0.9375rem;
  color: var(--color-text);
  transition: background var(--transition), color var(--transition);
}
.dropdown a:hover {
  background: var(--color-bg-alt);
  color: var(--color-green);
}

/* Header CTA (Windsurf-style primary action) */
.header-cta {
  flex-shrink: 0;
  padding: 0.5rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-btn);
}
.header-cta:hover {
  color: #fff;
}

.nav-toggle {
  display: none;
  flex-shrink: 0;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  padding: var(--space-sm);
  margin-left: var(--space-sm);
  background: none;
  border: none;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}
.nav-toggle:hover {
  background: rgba(0, 0, 0, 0.04);
}
.nav-toggle span {
  width: 18px;
  height: 1.5px;
  background: var(--color-text);
  border-radius: 1px;
}

/* ----- Hero: full viewport, dark (Baseten-style) ----- */
.hero {
  position: relative;
  width: 100%;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: calc(var(--header-h) + var(--space-4xl)) var(--space-2xl) var(--space-5xl);
  background: var(--color-dark-bg);
  color: var(--color-yellow);
  overflow: hidden;
}
.hero .hero-bg {
  background: radial-gradient(ellipse 100% 80% at 50% 0%, rgba(25, 231, 110, 0.12) 0%, transparent 50%),
              radial-gradient(ellipse 80% 50% at 80% 50%, rgba(140, 21, 21, 0.08) 0%, transparent 45%),
              var(--color-dark-bg);
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background: radial-gradient(ellipse 80% 50% at 50% 20%, rgba(245, 237, 200, 0.03) 0%, transparent 50%);
  pointer-events: none;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

/* Fluid graph: nodes and edges with reconnecting pulse */
.hero-graph {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero-graph-svg {
  width: 100%;
  height: 100%;
  display: block;
}

/* Edges: curved paths with continuous flow (signal travels along path) */
.hero-graph-edge {
  fill: none;
  stroke: url(#hero-edge-grad);
  stroke-width: 1;
  stroke-linecap: round;
  stroke-linejoin: round;
  opacity: 0.5;
  stroke-dasharray: 12 24;
  animation: hero-graph-edge-flow 3s linear infinite;
}

.hero-graph-edge-1 { animation-delay: 0s; }
.hero-graph-edge-2 { animation-delay: 0.15s; }
.hero-graph-edge-3 { animation-delay: 0.3s; }
.hero-graph-edge-4 { animation-delay: 0.45s; }
.hero-graph-edge-5 { animation-delay: 0.6s; }
.hero-graph-edge-6 { animation-delay: 0.75s; }
.hero-graph-edge-7 { animation-delay: 0.9s; }
.hero-graph-edge-8 { animation-delay: 1.05s; }
.hero-graph-edge-9 { animation-delay: 1.2s; }
.hero-graph-edge-10 { animation-delay: 1.35s; }
.hero-graph-edge-11 { animation-delay: 1.5s; }
.hero-graph-edge-12 { animation-delay: 1.65s; }
.hero-graph-edge-13 { animation-delay: 1.8s; }
.hero-graph-edge-14 { animation-delay: 1.95s; }
.hero-graph-edge-15 { animation-delay: 2.1s; }
.hero-graph-edge-16 { animation-delay: 2.25s; }
.hero-graph-edge-17 { animation-delay: 2.4s; }
.hero-graph-edge-18 { animation-delay: 0.2s; }
.hero-graph-edge-19 { animation-delay: 0.35s; }
.hero-graph-edge-20 { animation-delay: 0.5s; }
.hero-graph-edge-21 { animation-delay: 0.65s; }
.hero-graph-edge-22 { animation-delay: 0.8s; }
.hero-graph-edge-23 { animation-delay: 0.95s; }
.hero-graph-edge-24 { animation-delay: 1.1s; }
.hero-graph-edge-25 { animation-delay: 1.25s; }
.hero-graph-edge-26 { animation-delay: 1.4s; }
.hero-graph-edge-27 { animation-delay: 1.55s; }
.hero-graph-edge-28 { animation-delay: 1.7s; }
.hero-graph-edge-29 { animation-delay: 1.85s; }
.hero-graph-edge-30 { animation-delay: 2s; }
.hero-graph-edge-31 { animation-delay: 2.15s; }
.hero-graph-edge-32 { animation-delay: 2.3s; }
.hero-graph-edge-33 { animation-delay: 2.45s; }

@keyframes hero-graph-edge-flow {
  to { stroke-dashoffset: -36; }
}

/* Nodes: subtle fluid drift so the graph breathes */
.hero-graph-node-inner {
  animation: hero-graph-node-drift 8s ease-in-out infinite;
}

.hero-graph-node:nth-child(34) .hero-graph-node-inner { animation-delay: 0s; }
.hero-graph-node:nth-child(35) .hero-graph-node-inner { animation-delay: 0.5s; }
.hero-graph-node:nth-child(36) .hero-graph-node-inner { animation-delay: 1s; }
.hero-graph-node:nth-child(37) .hero-graph-node-inner { animation-delay: 0.25s; }
.hero-graph-node:nth-child(38) .hero-graph-node-inner { animation-delay: 0.75s; }
.hero-graph-node:nth-child(39) .hero-graph-node-inner { animation-delay: 1.25s; }
.hero-graph-node:nth-child(40) .hero-graph-node-inner { animation-delay: 0.4s; }
.hero-graph-node:nth-child(41) .hero-graph-node-inner { animation-delay: 0.9s; }
.hero-graph-node:nth-child(42) .hero-graph-node-inner { animation-delay: 0.15s; }
.hero-graph-node:nth-child(43) .hero-graph-node-inner { animation-delay: 0.65s; }
.hero-graph-node:nth-child(44) .hero-graph-node-inner { animation-delay: 1.15s; }
.hero-graph-node:nth-child(45) .hero-graph-node-inner { animation-delay: 0.35s; }
.hero-graph-node:nth-child(46) .hero-graph-node-inner { animation-delay: 0.85s; }
.hero-graph-node:nth-child(47) .hero-graph-node-inner { animation-delay: 0.1s; }
.hero-graph-node:nth-child(48) .hero-graph-node-inner { animation-delay: 0.6s; }
.hero-graph-node:nth-child(49) .hero-graph-node-inner { animation-delay: 1.1s; }
.hero-graph-node:nth-child(50) .hero-graph-node-inner { animation-delay: 0.3s; }
.hero-graph-node:nth-child(51) .hero-graph-node-inner { animation-delay: 0.8s; }
.hero-graph-node:nth-child(52) .hero-graph-node-inner { animation-delay: 1.2s; }
.hero-graph-node:nth-child(53) .hero-graph-node-inner { animation-delay: 0.45s; }

@keyframes hero-graph-node-drift {
  0%, 100% { transform: translate(0, 0); }
  25% { transform: translate(2px, -1px); }
  50% { transform: translate(-1px, 2px); }
  75% { transform: translate(1px, 1px); }
}

.hero-graph-node-dot {
  opacity: 0.9;
  transition: opacity 0.4s ease;
}
.hero-graph-node:hover .hero-graph-node-dot {
  opacity: 1;
}

@media (prefers-reduced-motion: reduce) {
  .hero-graph-edge,
  .hero-graph-node-inner {
    animation: none;
  }
  .hero-graph-edge {
    stroke-dasharray: none;
  }
  .hero-graph-node-inner {
    transform: none;
  }
}

.hero-inner {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  text-align: center;
}

.hero-label {
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-yellow-muted);
  margin: 0 0 var(--space-xl);
  font-weight: 500;
}

.hero-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(2.75rem, 8vw, 4.5rem);
  line-height: 1.05;
  margin: 0 0 var(--space-xl);
  color: var(--color-yellow);
  letter-spacing: -0.04em;
  max-width: 14ch;
  margin-left: auto;
  margin-right: auto;
}
.hero-title-line {
  display: block;
}

.hero-tagline {
  font-size: clamp(1.0625rem, 2vw, 1.25rem);
  font-weight: 400;
  max-width: 28em;
  margin: 0 auto var(--space-3xl);
  color: var(--color-yellow-muted);
  line-height: 1.6;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  justify-content: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  border-radius: 10px;
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform var(--transition), box-shadow var(--transition);
  cursor: pointer;
  border: 1px solid transparent;
}
.btn-primary {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
  box-shadow: 0 2px 12px rgba(140, 21, 21, 0.25);
}
.btn-primary:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(140, 21, 21, 0.35);
}
.hero .btn-ghost {
  color: var(--color-yellow);
  border-color: var(--color-yellow-muted);
  background: transparent;
}
.hero .btn-ghost:hover {
  border-color: var(--color-yellow);
  color: var(--color-yellow);
  background: rgba(245, 237, 200, 0.12);
  transform: translateY(-1px);
}
.btn-ghost-dark {
  color: var(--color-yellow);
  border-color: var(--color-yellow-muted);
  background: transparent;
}
.btn-ghost-dark:hover {
  border-color: var(--color-yellow);
  color: var(--color-yellow);
  background: rgba(245, 237, 200, 0.08);
}

.hero-scroll {
  position: absolute;
  bottom: var(--space-2xl);
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.6875rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-yellow-dim);
  font-weight: 500;
}
.scroll-line {
  width: 1px;
  height: 40px;
  background: var(--color-yellow-muted);
  animation: scroll-pulse 2s ease-in-out infinite;
}
@keyframes scroll-pulse {
  0%, 100% { opacity: 0.5; }
  50% { opacity: 1; }
}

/* ----- Sections: full width, dark to match hero ----- */
section {
  width: 100%;
  padding: var(--space-6xl) 0;
  position: relative;
  background: var(--color-dark-bg);
  color: var(--color-yellow);
}

section:nth-child(even) {
  background: var(--color-dark-surface);
}

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-2xl);
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-md);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-yellow-dim);
  margin: 0 0 var(--space-md);
  font-weight: 600;
}
.section-label::before {
  content: "";
  width: 3px;
  height: 1em;
  background: var(--color-green);
  border-radius: 2px;
  transform: translate3d(0, 0, 0);
  will-change: transform;
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 700;
  margin: 0 0 var(--space-2xl);
  color: var(--color-yellow);
  line-height: 1.2;
  letter-spacing: -0.02em;
}
.section-title--split .section-title-line {
  display: block;
}
.section-title--split {
  max-width: 16ch;
}
.section-lead {
  font-size: 1.125rem;
  line-height: 1.65;
  color: var(--color-yellow-muted);
  max-width: 42rem;
  margin: 0 0 var(--space-3xl);
}
.value-lead {
  margin-bottom: var(--space-4xl);
}

/* ----- About: full width content ----- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4xl);
  align-items: start;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-2xl);
}

.about-lead {
  font-size: 1.1875rem;
  line-height: 1.6;
  color: var(--color-yellow);
  margin: 0 0 var(--space-lg);
  font-weight: 400;
}

.about-body {
  color: var(--color-yellow-muted);
  margin: 0;
  font-size: 1.0625rem;
  line-height: 1.65;
}

.about-card {
  background: var(--color-dark-surface);
  padding: var(--space-2xl);
  border: 1px solid rgba(245, 237, 200, 0.1);
  border-radius: var(--radius-card);
  transition: box-shadow var(--transition), border-color var(--transition);
}
.about-card:hover {
  border-color: rgba(25, 231, 110, 0.35);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.3);
}

.about-stat {
  display: block;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-green);
  margin-bottom: var(--space-sm);
}

.about-card p {
  margin: 0;
  font-size: 1rem;
  color: var(--color-yellow-muted);
  line-height: 1.6;
}

/* ----- Value section ----- */
.value-section {
  background: var(--color-dark-bg);
}
.value-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-xl);
}
.value-card {
  padding: var(--space-2xl);
  background: var(--color-dark-surface);
  border: 1px solid rgba(245, 237, 200, 0.1);
  border-radius: var(--radius-card);
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}
.value-card:hover {
  border-color: rgba(25, 231, 110, 0.35);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.3);
  transform: translate3d(0, -2px, 0);
  will-change: transform;
}
.value-card h4 {
  font-family: var(--font-body);
  font-size: 1.0625rem;
  font-weight: 600;
  margin: 0 0 var(--space-md);
  color: var(--color-yellow);
}
.value-card p {
  margin: 0 0 var(--space-lg);
  font-size: 0.9375rem;
  color: var(--color-yellow-muted);
  line-height: 1.6;
}
.value-link {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-green);
  transition: color var(--transition), gap var(--transition);
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
}
.value-link:hover {
  color: var(--color-green-hover);
}

/* ----- Research ----- */
.research-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-xl);
}

.research-card {
  background: var(--color-dark-surface);
  padding: var(--space-2xl);
  border: 1px solid rgba(245, 237, 200, 0.1);
  border-radius: var(--radius-card);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.research-card:hover {
  border-color: rgba(25, 231, 110, 0.35);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.3);
  transform: translate3d(0, -2px, 0);
  will-change: transform;
}

.research-icon {
  width: 40px;
  height: 40px;
  margin-bottom: var(--space-lg);
  color: var(--color-green);
  transform: translate3d(0, 0, 0);
  will-change: transform;
}

.research-icon svg {
  width: 100%;
  height: 100%;
}

.research-card h4 {
  font-family: var(--font-body);
  font-size: 1.0625rem;
  font-weight: 600;
  margin: 0 0 var(--space-sm);
  color: var(--color-yellow);
  letter-spacing: 0.01em;
}

.research-card p {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--color-yellow-muted);
  line-height: 1.6;
}

/* ----- Team ----- */
.team-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-xl);
}

.team-card {
  text-align: center;
  padding: var(--space-2xl);
  background: var(--color-dark-surface);
  border: 1px solid rgba(245, 237, 200, 0.1);
  border-radius: var(--radius-card);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.team-card:hover {
  border-color: rgba(25, 231, 110, 0.35);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.3);
  transform: translate3d(0, -2px, 0);
  will-change: transform;
}

.team-card-placeholder {
  border-style: dashed;
  border-color: var(--color-yellow-dim);
}
.team-card-placeholder:hover {
  transform: none;
  box-shadow: none;
}

.team-avatar {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--space-lg);
  border-radius: 50%;
  background: rgba(245, 237, 200, 0.08);
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
  overflow: hidden;
}
.team-avatar--photo {
  padding: 0;
  background: none;
}
.team-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.team-card h4 {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 var(--space-xs);
  color: var(--color-yellow);
}

.team-role {
  font-size: 0.8125rem;
  color: var(--color-green);
  font-weight: 500;
  margin: 0 0 var(--space-sm);
}

.team-card p:last-child {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--color-yellow-muted);
  line-height: 1.5;
}

/* ----- Publications ----- */
.pub-intro {
  margin: 0 0 var(--space-2xl);
  color: var(--color-yellow-muted);
  font-size: 1rem;
  max-width: 40rem;
}

/* Tighter spacing in publications: title → filter → results */
.publications .section-label {
  margin-bottom: var(--space-sm);
}

.publications .section-title {
  margin-bottom: var(--space-sm);
}

.pub-filters {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin-top: 0;
  margin-bottom: var(--space-xs);
  padding: var(--space-xs) 0;
  border-bottom: 1px solid rgba(245, 237, 200, 0.12);
}

.pub-filter-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-sm);
}

.pub-filter-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-yellow-dim);
  margin-right: var(--space-xs);
}

.pub-filter-options {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.pub-filter-btn {
  padding: var(--space-xs) var(--space-sm);
  font-size: 0.8125rem;
  font-weight: 500;
  font-family: var(--font-body);
  color: var(--color-yellow-muted);
  background: rgba(245, 237, 200, 0.06);
  border: 1px solid rgba(245, 237, 200, 0.15);
  border-radius: var(--radius-btn);
  cursor: pointer;
  transition: color var(--transition), background var(--transition), border-color var(--transition);
}

.pub-filter-btn:hover {
  color: var(--color-yellow);
  background: rgba(245, 237, 200, 0.1);
  border-color: rgba(245, 237, 200, 0.25);
}

.pub-filter-btn.is-active {
  color: var(--color-dark-bg);
  background: var(--color-green);
  border-color: var(--color-green);
}

.pub-list {
  margin: 0;
  margin-top: 0;
  padding: 0;
  padding-top: var(--space-xs);
  margin-bottom: var(--space-xs);
}

.pub-list > .pub-year-group:first-child {
  margin-top: 0;
  padding-top: 0;
}

.pub-list--empty {
  padding-top: 0;
  margin-bottom: 0;
}

.pub-year-group {
  margin-bottom: var(--space-sm);
}

.pub-year-group:last-child {
  margin-bottom: 0;
}

.pub-year-heading {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-yellow-dim);
  margin: 0 0 var(--space-xs);
  padding-bottom: var(--space-xs);
  border-bottom: 1px solid rgba(245, 237, 200, 0.12);
}

.pub-list-inner {
  list-style: none;
  margin: 0;
  padding: 0;
}

.pub-item {
  display: grid;
  grid-template-columns: 4rem 1fr;
  gap: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  margin: 0 calc(-1 * var(--space-md));
  border-radius: var(--radius-card);
  border-bottom: 1px solid rgba(245, 237, 200, 0.1);
  transition: background var(--transition);
}

.pub-item:hover {
  background: rgba(245, 237, 200, 0.04);
}

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

.pub-year {
  font-family: var(--font-heading);
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--color-yellow-dim);
}

.pub-content h4 {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 var(--space-xs);
  color: var(--color-yellow);
  line-height: 1.35;
}

.pub-meta {
  font-size: 0.875rem;
  color: var(--color-yellow-muted);
  margin: 0;
  line-height: 1.45;
}

.pub-link {
  display: inline-block;
  margin-top: var(--space-xs);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-green);
}
.pub-link:hover {
  color: var(--color-green-hover);
}

.link-more {
  font-weight: 600;
  color: var(--color-green);
  transition: color var(--transition), gap var(--transition);
}
.link-more:hover {
  color: var(--color-green-hover);
}

/* ----- Resources ----- */
.resources-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-xl);
}

.resource-card {
  padding: var(--space-2xl);
  background: var(--color-dark-surface);
  border: 1px solid rgba(245, 237, 200, 0.1);
  border-radius: var(--radius-card);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.resource-card:hover {
  border-color: rgba(25, 231, 110, 0.35);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.3);
  transform: translate3d(0, -2px, 0);
  will-change: transform;
}

.resource-card h4 {
  font-family: var(--font-body);
  font-size: 1.0625rem;
  font-weight: 600;
  margin: 0 0 var(--space-sm);
  color: var(--color-yellow);
}

.resource-card p {
  margin: 0;
  font-size: 1rem;
  color: var(--color-yellow-muted);
  line-height: 1.6;
}

/* ----- Contact ----- */
.contact-inner {
  max-width: var(--container-narrow);
}

.contact-text {
  margin: 0 0 var(--space-md);
  color: var(--color-yellow-muted);
  font-size: 1.0625rem;
  line-height: 1.65;
}

.contact-inner .btn {
  margin-top: var(--space-md);
}

/* ----- Footer: dark (Baseten-style) ----- */
.site-footer {
  width: 100%;
  padding: var(--space-5xl) var(--space-2xl) var(--space-3xl);
  background: var(--color-dark-bg);
  color: var(--color-yellow-muted);
  font-size: 0.9375rem;
}

.site-footer::before {
  content: "";
  display: block;
  width: 100%;
  max-width: var(--container);
  margin: 0 auto var(--space-4xl);
  padding: 0 var(--space-2xl);
  box-sizing: content-box;
  height: 0;
  border-top: 1px solid rgba(245, 237, 200, 0.12);
}

.footer-inner {
  max-width: var(--container);
  margin: 0 auto;
}

/* Footer brand block (Windsurf-style: logo + tagline) */
.footer-brand-block {
  margin-bottom: var(--space-4xl);
}

.footer-brand-logo {
  display: inline-block;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-yellow);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
  transition: opacity var(--transition);
}

.footer-brand-logo:hover {
  color: var(--color-yellow);
  opacity: 0.9;
}

.footer-brand-tagline {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--color-yellow-muted);
  line-height: 1.5;
  max-width: 28ch;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3xl) var(--space-2xl);
  margin-bottom: var(--space-4xl);
}
.footer-grid--four {
  grid-template-columns: repeat(4, 1fr);
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.footer-heading {
  margin: 0;
  font-family: var(--font-body);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-yellow-dim);
}

.footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer-links a {
  color: var(--color-yellow-muted);
  font-size: 0.9375rem;
  font-weight: 400;
  line-height: 1.5;
  transition: color var(--transition);
}

.footer-links a:hover {
  color: var(--color-yellow);
}

.footer-bottom {
  padding-top: var(--space-2xl);
  border-top: 1px solid rgba(245, 237, 200, 0.12);
}

.footer-legal {
  margin: 0;
  font-size: 0.8125rem;
  color: var(--color-yellow-dim);
  line-height: 1.5;
}

/* ----- CTA section ----- */
.cta-section {
  background: var(--color-dark-bg);
  color: var(--color-yellow);
  padding: var(--space-5xl) 0;
  text-align: center;
}
.cta-section-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 700;
  margin: 0 0 var(--space-md);
  letter-spacing: -0.02em;
  color: var(--color-yellow);
}
.cta-section-tagline {
  font-size: 1.125rem;
  color: var(--color-yellow-muted);
  max-width: 28rem;
  margin: 0 auto var(--space-2xl);
  line-height: 1.6;
}
.cta-section-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  justify-content: center;
}
.cta-section .btn-primary:hover {
  color: #fff;
}
.cta-section .btn-ghost-dark {
  color: var(--color-yellow);
  border-color: var(--color-yellow-muted);
}
.cta-section .btn-ghost-dark:hover {
  background: rgba(245, 237, 200, 0.1);
  border-color: var(--color-yellow);
  color: var(--color-yellow);
}

/* ----- Responsive ----- */
@media (max-width: 1024px) {
  .value-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .research-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .team-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 900px) {
  .about-grid {
    grid-template-columns: 1fr;
  }
  .nav {
    display: none;
  }
  .header-actions {
    display: none;
  }
  .nav-toggle {
    display: flex;
  }
  .nav.is-open .nav-list {
    display: flex;
  }
  .nav.is-open .dropdown {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: none;
    border-radius: 0;
    padding-left: var(--space-lg);
    margin-top: var(--space-xs);
    margin-bottom: var(--space-sm);
  }
  .has-dropdown .nav-link::after {
    display: none;
  }
}

@media (max-width: 768px) {
  :root {
    --header-h: 3.5rem;
  }
  section {
    padding: var(--space-5xl) 0;
  }
  .container,
  .header-inner {
    padding: 0 var(--space-xl);
  }
  .about-grid {
    padding: 0 var(--space-xl);
  }
  .hero {
    padding-left: var(--space-xl);
    padding-right: var(--space-xl);
  }
  .hero-cta {
    flex-direction: column;
  }
  .hero .btn {
    width: 100%;
    max-width: 280px;
  }
  .value-grid {
    grid-template-columns: 1fr;
  }
  .research-grid {
    grid-template-columns: 1fr;
  }
  .team-grid {
    grid-template-columns: 1fr;
  }
  .resources-grid {
    grid-template-columns: 1fr;
  }
  .pub-item {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
  }
  .site-footer {
    padding: var(--space-4xl) var(--space-xl) var(--space-2xl);
  }
  .site-footer::before {
    margin-bottom: var(--space-3xl);
    padding: 0 var(--space-xl);
  }
  .footer-grid,
  .footer-grid--four {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
    margin-bottom: var(--space-3xl);
  }
  .footer-bottom {
    padding-top: var(--space-xl);
  }
}

/* Mobile nav */
@media (max-width: 900px) {
  .nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-xl);
    display: none;
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
  }
  .nav.is-open {
    display: block;
  }
  .nav-list {
    flex-direction: column;
    gap: 0;
    align-items: stretch;
  }
  .nav-item {
    border-bottom: 1px solid var(--color-border);
  }
  .nav-item:last-child {
    border-bottom: none;
  }
  .nav-link {
    display: block;
    padding: var(--space-md) 0;
    font-size: 1rem;
    color: var(--color-text);
  }
  .nav-link:hover {
    color: var(--color-green);
  }
  .dropdown a {
    padding: var(--space-sm) 0;
    font-size: 0.9375rem;
    color: var(--color-text-muted);
  }
  .dropdown a:hover {
    color: var(--color-green);
    background: transparent;
  }
}