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

:root {
  --color-bg: #f7f9fa;
  --color-surface: #ffffff;
  --color-text: #1a1a1a;
  --color-text-secondary: #5c5c5c;
  --color-accent: #5B9FD5;
  --color-accent-light: #AED6F1;
  --color-accent-secondary: #4A9B5D;
  --color-border: #dde4e8;
  --color-grid: #e6ecf0;
  --font-serif: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --max-width: 1200px;
  --nav-height: 64px;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  font-size: 16px;
}

a {
  color: inherit;
  text-decoration: none;
}

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

/* ===== Navbar ===== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  height: var(--nav-height);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 32px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 400;
  letter-spacing: -0.01em;
  color: var(--color-text);
}

.logo strong {
  font-weight: 600;
}

.logo-icon {
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
}

.nav-links a {
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--color-text);
}

.nav-btn {
  padding: 7px 18px;
  border: 1.5px solid var(--color-text);
  border-radius: 4px;
  color: var(--color-text) !important;
  transition: all 0.2s;
}

.nav-btn:hover {
  background: var(--color-text);
  color: #fff !important;
}

.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.mobile-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--color-text);
  transition: transform 0.3s;
}

.mobile-menu {
  display: none;
  flex-direction: column;
  padding: 16px 32px 24px;
  gap: 16px;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  font-size: 16px;
  color: var(--color-text-secondary);
}

.mobile-menu a:hover {
  color: var(--color-text);
}

.mobile-menu.active {
  display: flex;
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: calc(90vh - var(--nav-height));
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--color-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-grid) 1px, transparent 1px);
  background-size: 60px 60px;
  opacity: 0.6;
  pointer-events: none;
}

.hero-content {
  position: relative;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 80px 32px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  width: 100%;
}

.hero-text {
  max-width: 580px;
}

.hero-eyebrow {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent-secondary);
  margin-bottom: 16px;
}

.hero-text h1 {
  font-family: var(--font-serif);
  font-size: clamp(30px, 3.5vw, 44px);
  font-weight: 500;
  line-height: 1.22;
  letter-spacing: -0.015em;
  margin-bottom: 24px;
  color: var(--color-text);
  max-width: 11.3em;
}

.hero-body {
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
}

.hero-body a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-color: var(--color-accent-light);
  text-underline-offset: 2px;
  transition: text-decoration-color 0.2s;
}

.hero-body a:hover {
  text-decoration-color: var(--color-accent);
}

.hero-body.highlight {
  color: var(--color-text);
  font-weight: 400;
  margin-top: 20px;
}

.hero-body.highlight em {
  font-style: italic;
  color: var(--color-accent-secondary);
  font-weight: 500;
}

.hero-ctas {
  display: flex;
  gap: 16px;
  margin-top: 32px;
  align-items: center;
}

.btn-primary {
  display: inline-block;
  padding: 13px 32px;
  font-size: 13px;
  font-weight: 600;
  font-family: var(--font-sans);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background: linear-gradient(120deg, #6BA8D8 0%, #7CC3B3 55%, #5BA56C 100%);
  color: #fff;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: filter 0.35s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.35s cubic-bezier(0.4, 0, 0.2, 1),
              box-shadow 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  text-decoration: none;
  box-shadow: 0 2px 10px rgba(91, 159, 213, 0.14);
}

.btn-primary:hover {
  filter: brightness(1.03);
  box-shadow: 0 6px 18px rgba(91, 159, 213, 0.22);
  transform: translateY(-1px);
}

.btn-primary.btn-solid {
  background: var(--color-accent-secondary);
  box-shadow: 0 2px 8px rgba(74, 155, 93, 0.18);
}

.btn-primary.btn-solid:hover {
  background: #3d7f4e;
  filter: none;
  box-shadow: 0 4px 14px rgba(74, 155, 93, 0.28);
}

.btn-secondary {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  transition: color 0.2s;
}

.btn-secondary:hover {
  color: var(--color-text);
}

.hero-graphic {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  min-height: 520px;
}

#divergence-canvas {
  width: 100%;
  height: 100%;
  min-height: 520px;
}

/* ===== Sections Common ===== */
.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 32px;
}

.section-label {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 48px;
  color: var(--color-text-secondary);
}

.accent-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  background: var(--color-accent-secondary);
  border-radius: 50%;
}


/* ===== About Section ===== */
.about-section {
  padding: 120px 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

.about-stack {
  display: block;
}

.about-lead {
  font-family: var(--font-serif);
  font-size: 24px;
  line-height: 1.5;
  font-weight: 400;
  color: var(--color-text);
  max-width: 860px;
  margin-bottom: 56px;
}

.about-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.about-item {
  padding: 32px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 12px;
  aspect-ratio: 16 / 9;
  min-width: 0;
}

.about-item .about-icon {
  width: 34px;
  height: 34px;
  margin-bottom: 4px;
}

.about-icon {
  color: var(--color-accent-secondary);
  margin-bottom: 0;
}

.about-item h3 {
  font-size: 16px;
  font-weight: 600;
  margin: 0;
  letter-spacing: -0.01em;
}

.about-item p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin: 0;
}

/* ===== Research Section ===== */
.research-section {
  padding: 80px 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

.research-intro {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text-secondary);
  max-width: 720px;
  margin-top: 0;
  margin-bottom: 28px;
}

.paper-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.paper-card {
  padding: 24px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  min-height: 300px;
}

.paper-card .paper-desc {
  flex: 1;
  min-height: 0;
}

.paper-card--primary {
  border-left: 3px solid var(--color-text);
}

.paper-venue {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.paper-card h3 {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 500;
  line-height: 1.35;
  margin-bottom: 6px;
  letter-spacing: -0.01em;
}

.paper-authors {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 12px;
}

.paper-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
}

.paper-links {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.paper-links a {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  transition: color 0.2s;
}

.paper-links a:hover {
  color: var(--color-text);
}

.paper-support {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-text-secondary);
  font-style: italic;
}

/* ===== Fellowship Section ===== */
.fellowship-section {
  padding: 120px 0;
  border-top: 1px solid var(--color-border);
}

.fellowship-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.program-title {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 500;
  letter-spacing: -0.015em;
  margin-bottom: 16px;
}

.apply-link {
  display: inline-block;
  margin-top: 32px;
  padding: 11px 26px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: #5B9FD5;
  border: 1.5px solid #5B9FD5;
  border-radius: 999px;
  text-decoration: none;
  transition: background 0.25s ease, color 0.25s ease, box-shadow 0.25s ease;
}

.apply-link:hover {
  background: #5B9FD5;
  color: #fff;
  box-shadow: 0 4px 14px rgba(91, 159, 213, 0.25);
  opacity: 1;
}

.fellowship-lead {
  font-family: var(--font-serif);
  font-size: 20px;
  line-height: 1.6;
  color: var(--color-text);
  margin-bottom: 32px;
}

.fellowship-outputs h3,
.fellowship-motivation h3 {
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 12px;
  color: var(--color-accent-secondary);
}

.fellowship-motivation p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

.fellowship-outputs ul {
  list-style: none;
}

.fellowship-outputs li {
  font-size: 15px;
  line-height: 1.7;
  padding: 8px 0;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-secondary);
}

.fellowship-outputs li strong {
  color: var(--color-text);
  font-weight: 600;
}

.fellowship-outputs li em {
  font-style: italic;
  color: var(--color-text-secondary);
}

.fellowship-extras {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.fellowship-extra-card {
  padding: 28px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 10px;
}

.fellowship-extra-card h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
}

.fellowship-extra-card p {
  font-size: 14px;
  line-height: 1.65;
  color: var(--color-text-secondary);
}

.launching-tag {
  display: inline-block;
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--color-border);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent-secondary);
  width: 100%;
}

.program-block {
  margin-bottom: 80px;
  padding-bottom: 80px;
  border-bottom: 1px solid var(--color-border);
}

.program-block:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.program-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.research-streams,
.workshop-format,
.course-modules {
  list-style: none;
  padding: 0;
}

.research-streams li,
.workshop-format li {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-secondary);
  padding: 10px 0;
  border-bottom: 1px solid var(--color-border);
}

.research-streams li:last-child,
.workshop-format li:last-child {
  border-bottom: none;
}

.research-streams li strong,
.workshop-format li strong {
  color: var(--color-text);
  font-weight: 600;
}

.course-modules {
  counter-reset: module;
  padding: 0;
}

.course-modules li {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-secondary);
  padding: 8px 0 8px 28px;
  position: relative;
  border-bottom: 1px solid var(--color-border);
}

.course-modules li:last-child {
  border-bottom: none;
}

.course-modules li::before {
  counter-increment: module;
  content: counter(module);
  position: absolute;
  left: 0;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-accent-secondary);
}

.module-note {
  margin-top: 16px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-text-secondary);
  font-style: italic;
}

/* ===== Founders / Team ===== */
.founders-section {
  padding: 120px 0;
  border-top: 1px solid var(--color-border);
}

.founders-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.founder-card {
  padding: 32px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
}

.founder-avatar {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-secondary));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  font-weight: 500;
  font-family: var(--font-serif);
  margin-bottom: 16px;
}

.founder-photo {
  width: 80px;
  height: 80px;
  border-radius: 6px;
  object-fit: cover;
  object-position: center 20%;
  margin-bottom: 16px;
}

.founder-photo--contain {
  object-fit: contain;
  object-position: center;
}

.founder-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 4px;
}

.founder-role {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-accent-secondary);
  margin-bottom: 12px;
}

.founder-card p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

.subsection-label {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  margin-top: 64px;
  margin-bottom: 32px;
  padding-top: 48px;
  border-top: 1px solid var(--color-border);
}

.advisory-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.advisory-card {
  padding: 24px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  text-align: center;
}

.advisory-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-border);
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 600;
  font-family: var(--font-sans);
  margin: 0 auto 14px;
  letter-spacing: 0.02em;
}

.advisory-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 2px;
}

.advisory-affil {
  font-size: 13px;
  color: var(--color-text-secondary);
}

.section-cta {
  margin-top: 40px;
  text-align: center;
}

.btn-text {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  transition: color 0.2s;
}

.btn-text:hover {
  color: var(--color-text);
}

/* ===== Donate ===== */
.donate-section {
  padding: 80px 0;
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
}

.donate-box {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
}

.donate-box h2 {
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: 500;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.donate-box p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-bottom: 28px;
}

/* ===== Newsletter ===== */
.newsletter-section {
  padding: 80px 0;
  border-top: 1px solid var(--color-border);
}

.newsletter-box {
  max-width: 520px;
  margin: 0 auto;
  text-align: center;
}

.newsletter-box h2 {
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: 500;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.newsletter-box > p {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: 28px;
}

.newsletter-form {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.newsletter-form .form-row {
  display: flex;
  gap: 10px;
}

.newsletter-form input[type="text"],
.newsletter-form input[type="email"] {
  flex: 1;
  width: 100%;
  padding: 12px 16px;
  font-size: 14px;
  font-family: var(--font-sans);
  border: 1.5px solid var(--color-border);
  border-radius: 4px;
  background: var(--color-surface);
  outline: none;
  transition: border-color 0.2s;
}

.newsletter-form input[type="text"]:focus,
.newsletter-form input[type="email"]:focus {
  border-color: var(--color-accent);
}

.newsletter-form button {
  padding: 12px 24px;
  font-size: 12px;
  font-family: var(--font-sans);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: var(--color-text);
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.2s;
  white-space: nowrap;
}

.newsletter-form button:hover {
  background: #333;
}

.form-success {
  margin-top: 4px;
  font-size: 14px;
  color: var(--color-accent-secondary);
}

.form-error {
  margin-top: 4px;
  font-size: 14px;
  color: #c0392b;
}

/* ===== Footer ===== */
footer {
  border-top: 1px solid var(--color-border);
  padding: 60px 0 40px;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 32px;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  gap: 60px;
  margin-bottom: 48px;
}

.footer-brand {
  max-width: 300px;
}

.footer-logo {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 500;
  display: block;
  margin-bottom: 10px;
}

.footer-brand p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.footer-links {
  display: flex;
  gap: 60px;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col h4 {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
  color: var(--color-text);
}

.footer-col a {
  font-size: 14px;
  color: var(--color-text-secondary);
  transition: color 0.2s;
}

.footer-col a:hover {
  color: var(--color-text);
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: 24px;
}

.footer-bottom p {
  font-size: 13px;
  color: var(--color-text-secondary);
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .nav-links {
    display: none;
  }

  .mobile-toggle {
    display: flex;
  }

  .hero-content {
    grid-template-columns: 1fr;
    padding: 60px 24px;
    gap: 40px;
  }

  .hero-graphic {
    min-height: 260px;
    order: -1;
  }

  .about-cards {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .about-item {
    aspect-ratio: auto;
    padding: 24px;
  }

  .about-lead {
    font-size: 20px;
    margin-bottom: 36px;
  }

  .paper-card {
    min-height: auto;
  }

  .paper-card--primary {
    grid-column: 1;
  }

  .fellowship-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .program-columns {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .founders-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .advisory-grid {
    grid-template-columns: 1fr 1fr;
  }

  .footer-top {
    flex-direction: column;
    gap: 40px;
  }

  .footer-links {
    gap: 40px;
    flex-wrap: wrap;
  }
}

@media (max-width: 640px) {
  .paper-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .nav-inner {
    padding: 0 20px;
  }

  .logo span {
    font-size: 15px;
  }

  .section-inner {
    padding: 0 20px;
  }

  .hero-text h1 {
    font-size: 26px;
  }

  .hero-ctas {
    flex-direction: column;
    align-items: flex-start;
  }

  .newsletter-form .form-row {
    flex-direction: column;
  }
}

/* ===== Animations ===== */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-text {
  animation: fadeUp 0.8s ease-out;
}