@import url("https://fonts.googleapis.com/css2?family=Source+Serif+4:ital,opsz,wght@0,8..60,400;0,8..60,500;1,8..60,400&family=Inter:wght@400;500&display=swap");

:root {
  --color-bg: #fafafa;
  --color-text-primary: #111111;
  --color-text-secondary: #444444;
  --color-text-meta: #707070;
  --color-divider: rgba(136, 136, 136, 0.15);
  --content-max-width: 680px;
  --font-serif: "Source Serif 4", Georgia, serif;
  --font-sans: "Inter", -apple-system, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: #141414;
    --color-text-primary: #e8e8e8;
    --color-text-secondary: #a8a8a8;
    --color-text-meta: #707070;
    --color-divider: rgba(255, 255, 255, 0.08);
  }
}

[data-theme="dark"] {
  --color-bg: #141414;
  --color-text-primary: #e8e8e8;
  --color-text-secondary: #a8a8a8;
  --color-text-meta: #707070;
  --color-divider: rgba(255, 255, 255, 0.08);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 18px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: auto;
  scroll-padding-top: 2rem;
}

body {
  font-family: var(--font-serif);
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  line-height: 1.8;
}

/* Page settle animation */
.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  animation: pageSettle 500ms ease-out;
}

@keyframes pageSettle {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* Container */
.container {
  width: 100%;
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

/* Header */
.header {
  padding: 4rem 0 3rem;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.site-title {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-primary);
  text-decoration: none;
}

.site-title:hover {
  text-decoration: none;
}

/* Navigation */
.nav {
  display: flex;
  gap: 2.5rem;
  align-items: baseline;
}

/* Hide mobile toggle on desktop by default */
.nav-toggle {
  display: none;
  color: var(--color-text-primary);
}

.nav-link {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--color-text-meta);
  text-decoration: none;
}

.nav-link:hover {
  color: var(--color-text-primary);
  text-decoration: underline;
}

.nav-link-secondary {
  opacity: 0.85;
}

/* Main content */
.main {
  flex: 1;
  padding: 3rem 0 8rem;
}

/* Footer */
.footer {
  padding: 4rem 0;
  border-top: 1px solid var(--color-divider);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
}

.footer-title {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-text-primary);
  letter-spacing: 0.04em;
  margin-bottom: 0.5rem;
}

.footer-text {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  color: var(--color-text-meta);
  line-height: 1.6;
}

/* Theme toggle */
.theme-toggle {
  font-family: var(--font-sans);
  font-size: 0.7rem;
  color: var(--color-text-meta);
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.theme-toggle:hover {
  color: var(--color-text-secondary);
  text-decoration: underline;
}

/* Page header */
.page-header {
  margin-bottom: 5rem;
}

.page-title {
  font-family: var(--font-serif);
  font-size: 1.75rem;
  font-weight: 500;
  line-height: 1.35;
  color: var(--color-text-primary);
  margin-bottom: 1.25rem;
}

.page-subtitle {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

/* Hero section */
.hero {
  margin-bottom: 6rem;
  padding-bottom: 5rem;
  border-bottom: 1px solid var(--color-divider);
  border-radius: 5px;
}

.hero-text {
  font-family: var(--font-serif);
  font-size: 1.65rem;
  font-weight: 600;
  line-height: 1.45;
  color: var(--color-text-primary);
  margin-bottom: 2.5rem;
}

.hero-subtext {
  font-size: 1.05rem;
  font-weight: 300;
  line-height: 1.75;
  color: var(--color-text-secondary);
  max-width: 580px;
  text-align: left;
}

/* Home sections */
.home-section {
  margin-bottom: 5rem;
}

.section-heading {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 1.75rem;
}

.section-content p {
  font-size: 1rem;
  font-weight: 300;
  line-height: 1.8;
  color: var(--color-text-secondary);
  margin-bottom: 1.5rem;
}

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

/* Areas list */
.areas-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.area-link {
  font-family: var(--font-serif);
  font-size: 1rem;
  color: var(--color-text-secondary);
  text-decoration: none;
  line-height: 1.5;
}

.area-link:hover {
  color: var(--color-text-primary);
  text-decoration: underline;
}

/* Closing section */
.closing {
  margin-top: 6rem;
  padding-top: 5rem;
  border-top: 1px solid var(--color-divider);
}

.closing-text {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-text-secondary);
  margin-bottom: 3rem;
}

.request-link {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--color-text-meta);
  text-decoration: none;
}

.request-link:hover {
  color: var(--color-text-primary);
  text-decoration: underline;
}

/* Essays list */
.essays-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.essays-list-item {
  margin-bottom: 2rem;
}

.essays-list-link {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: var(--color-text-primary);
  text-decoration: none;
  line-height: 1.4;
}

.essays-list-link:hover {
  text-decoration: underline;
}

/* Essay article */
.essay-article {
  max-width: var(--content-max-width);
}

.essay-article-header {
  margin-bottom: 4rem;
}

.essay-article-title {
  font-family: var(--font-serif);
  font-size: 1.75rem;
  font-weight: 500;
  line-height: 1.35;
  color: var(--color-text-primary);
}

.essay-article-body {
  font-size: 1.05rem;
  line-height: 1.9;
}

.essay-article-body p {
  margin-bottom: 2rem;
  color: var(--color-text-primary);
}

.essay-article-body p:last-child {
  margin-bottom: 0;
}

/* Back link */
.back-link {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--color-text-meta);
  text-decoration: none;
  display: inline-block;
  margin-bottom: 4rem;
}

.back-link:hover {
  color: var(--color-text-primary);
  text-decoration: underline;
}

/* Essay gating */
.essay-gating {
  margin-top: 4rem;
  padding-top: 3rem;
  border-top: 1px solid var(--color-divider);
}

.gating-message {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--color-text-primary);
  font-style: italic;
  margin-bottom: 2rem;
}

.gating-link {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--color-text-meta);
  text-decoration: none;
}

.gating-link:hover {
  color: var(--color-text-primary);
  text-decoration: underline;
}

/* Memo sections */
.memo-section {
  margin-bottom: 5rem;
}

.memo-heading {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--color-text-primary);
  margin-bottom: 1.75rem;
  line-height: 1.4;
}

.memo-content p {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--color-text-secondary);
  margin-bottom: 1.5rem;
}

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

/* Closing memo */
.closing-memo {
  margin-top: 6rem;
  padding-top: 4rem;
  border-top: 1px solid var(--color-divider);
}

.closing-memo-text {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--color-text-secondary);
}

/* Essay sections */
.essay-section {
  margin-bottom: 5rem;
}

.essay-section-title {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--color-text-primary);
  margin-bottom: 2rem;
  line-height: 1.4;
}

.essay-section-body p {
  font-size: 1.02rem;
  line-height: 1.9;
  color: var(--color-text-primary);
  margin-bottom: 1.85rem;
}

.essay-section-body p:last-child {
  margin-bottom: 0;
}

/* Essay footer */
.essay-article-footer {
  margin-top: 6rem;
  padding-top: 4rem;
  border-top: 1px solid var(--color-divider);
}

.essay-closing {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--color-text-secondary);
  font-style: italic;
}

/* Principals page */
.principals-opening {
  margin-bottom: 5rem;
}

.principals-opening p {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-text-secondary);
  margin-bottom: 1.5rem;
}

.principal {
  margin-bottom: 5rem;
}

.principal-name {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--color-text-primary);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
}

.principal-linkedin {
  display: inline-flex;
  align-items: center;
  color: var(--color-text-meta);
  text-decoration: none;
}

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

.linkedin-icon {
  width: 14px;
  height: 14px;
}

.principal-role {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--color-text-meta);
  margin-bottom: 2rem;
}

.principal-description p {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-text-secondary);
  margin-bottom: 1.5rem;
}

.principals-closing {
  margin-top: 5rem;
  padding-top: 3rem;
  border-top: 1px solid var(--color-divider);
}

.principals-closing .closing-statement {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-text-secondary);
}

/* Access page */
.access-framing {
  margin-bottom: 4rem;
}

.framing-text {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-text-secondary);
  margin-bottom: 1.5rem;
}

.access-section {
  margin-bottom: 4rem;
}

.access-section-title {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--color-text-primary);
  margin-bottom: 1.5rem;
}

.access-section-body p {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--color-text-secondary);
  margin-bottom: 1.25rem;
}

/* Access form */
.access-form-section {
  margin-top: 4rem;
  padding-top: 3rem;
  border-top: 1px solid var(--color-divider);
}

.access-form {
  max-width: 480px;
}

.form-field {
  margin-bottom: 2rem;
}

.form-label {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-text-primary);
  margin-bottom: 0.625rem;
  letter-spacing: 0.02em;
}

.form-input,
.form-textarea {
  width: 100%;
  font-family: var(--font-serif);
  font-size: 1rem;
  color: var(--color-text-primary);
  background-color: transparent;
  border: none;
  border-bottom: 1px solid var(--color-divider);
  padding: 0.625rem 0;
  outline: none;
}

.form-input:focus,
.form-textarea:focus {
  border-bottom-color: var(--color-text-primary);
}

.form-textarea {
  resize: vertical;
  min-height: 100px;
  line-height: 1.6;
}

.form-submit {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--color-text-meta);
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  margin-top: 1rem;
}

.form-submit:hover {
  color: var(--color-text-primary);
  text-decoration: underline;
}

/* Links */
a {
  color: var(--color-text-primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* Mobile-optimized hamburger and responsive nav */
.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 640px) {
  .container {
    padding: 0 1rem;
  }
  .header {
    padding: 1.5rem 0 1rem;
  }
  .header-inner {
    flex-direction: row;
    align-items: center;
    gap: 1rem;
  }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 44px;
    min-height: 44px;
    background: none;
    border: none;
    padding: 6px;
    color: var(--color-text-primary);
  }

  .nav {
    display: flex;
    flex-direction: column;
    gap: 0;
    width: calc(100% - 2rem);
    margin-top: 0.5rem;
    background: var(--color-bg);
    padding: 0.5rem 0.75rem;
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    transform-origin: top;
    transform: scaleY(0);
    opacity: 0;
    transition:
      transform 240ms cubic-bezier(0.2, 0.9, 0.2, 1),
      opacity 200ms ease;
    overflow: hidden;
    max-height: 0;
  }

  .nav[data-open="true"] {
    transform: scaleY(1);
    opacity: 1;
    max-height: 400px;
  }

  .nav-link {
    display: block;
    padding: 0.75rem 0.5rem;
    font-size: 1rem;
    color: var(--color-text-primary);
  }

  .nav-link:hover {
    background: rgba(0, 0, 0, 0.02);
  }

  .nav-link:focus {
    outline: none;
    background: rgba(0, 0, 0, 0.04);
  }

  .nav-toggle:focus-visible {
    outline: 2px solid Highlight;
    outline-offset: 2px;
    border-radius: 6px;
  }

  .hamburger .bar {
    fill: currentColor;
    transition:
      transform 200ms ease,
      opacity 150ms ease;
    transform-origin: center;
  }

  .nav-toggle.open .hamburger .top {
    transform: translateY(5px) rotate(45deg);
  }

  .nav-toggle.open .hamburger .middle {
    opacity: 0;
  }

  .nav-toggle.open .hamburger .bottom {
    transform: translateY(-5px) rotate(-45deg);
  }

  .footer-content {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }
  .footer {
    padding: 2rem 0;
  }
  .hero-text {
    font-size: 1.15rem;
    line-height: 1.35;
    margin-bottom: 1.25rem;
  }
  .hero-subtext {
    font-size: 0.95rem;
    max-width: none;
  }
}

@media (min-width: 641px) {
  /* Ensure nav wraps on small desktop widths */
  .nav {
    flex-wrap: wrap;
  }
}