/* ===== CSS Variables / Theme ===== */
:root {
  --font-sans: "Source Sans 3", sans-serif;
  --color-foreground: #0c0c0c;
  --color-foreground-dark: #fafafa;
  --color-background: #fff;
  --color-background-dark: #2b2b2b;
  --color-primary: #0784b5;
  --color-primary-dark: #9bd4e4;
  --spacing: 0.25rem;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 6rem;
  -webkit-text-size-adjust: 100%;
  tab-size: 4;
  line-height: 1.5;
  font-family: var(--font-sans);
}

body {
  color: var(--color-foreground);
  background-color: var(--color-background);
  font-weight: 300;
  transition: color 0.15s cubic-bezier(0.4, 0, 0.2, 1),
              background-color 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.dark body {
  color: var(--color-foreground-dark);
  background-color: var(--color-background-dark);
}

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

ul, ol, menu {
  list-style: none;
}

img, svg, video {
  display: block;
  vertical-align: middle;
}

img, video {
  max-width: 100%;
  height: auto;
}

button {
  font: inherit;
  color: inherit;
  background: transparent;
  border: none;
  border-radius: 0;
  cursor: pointer;
}

h1, h2, h3, h4, h5, h6 {
  font-size: inherit;
  font-weight: inherit;
}

/* ===== Layout ===== */
.app-container {
  max-width: 2000px;
  padding-inline: calc(var(--spacing) * 6);
  margin-inline: auto;
}

@media (min-width: 40rem) {
  .app-container {
    padding-inline: calc(var(--spacing) * 12);
  }
}

@media (min-width: 64rem) {
  .app-container {
    padding-inline: calc(var(--spacing) * 8);
  }
}

@media (min-width: 80rem) {
  .app-container {
    padding-inline: calc(var(--spacing) * 12);
  }
}

@media (min-width: 96rem) {
  .app-container {
    padding-inline: calc(var(--spacing) * 16);
  }
}

.page-wrapper {
  flex: 1;
}

/* ===== Header / Nav ===== */
header {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 40;
  background-color: var(--color-background);
}

.dark header {
  background-color: var(--color-background-dark);
}

.nav-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-block: calc(var(--spacing) * 5);
}

.logo-link {
  display: block;
}

/* ===== Wordmark ===== */
.wordmark {
  font-size: 1.25rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  line-height: 1.2;
  max-width: 9rem;
}

@media (min-width: 48rem) {
  .wordmark {
    font-size: 1.5rem;
    max-width: none;
    white-space: nowrap;
  }
}

@media (hover: hover) {
  .wordmark:hover {
    color: var(--color-primary);
  }

  .dark .wordmark:hover {
    color: var(--color-primary-dark);
  }
}

.wordmark-footer {
  font-size: 1.25rem;
  max-width: none;
}

.nav-right {
  gap: calc(var(--spacing) * 8);
  display: none;
  align-items: center;
}

@media (min-width: 48rem) {
  .nav-right {
    display: flex;
  }
}

.nav-link {
  font-size: 1.125rem;
  line-height: calc(1.75 / 1.125);
  text-underline-offset: 4px;
  text-decoration-thickness: 2px;
  position: relative;
}

@media (hover: hover) {
  .nav-link:hover {
    text-decoration-line: underline;
  }
}

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

.dark .nav-link.active {
  color: var(--color-primary-dark);
}

/* ===== Theme Switcher ===== */
.theme-switcher {
  border: 1px solid var(--color-foreground);
  border-radius: 9999px;
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 0.8;
}

.dark .theme-switcher {
  border-color: var(--color-foreground-dark);
}

.theme-button {
  padding: calc(var(--spacing) * 1);
  border-radius: 9999px;
  transition: none;
  font-size: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

@media (min-width: 48rem) {
  .theme-button {
    font-size: 1.125rem;
  }
}

.theme-button svg {
  width: 1em;
  height: 1em;
}

@media (hover: hover) {
  .theme-button:hover {
    filter: brightness(0.75);
  }
}

.theme-button.active {
  background-color: color-mix(in oklab, var(--color-foreground) 90%, transparent);
  color: var(--color-background);
}

.dark .theme-button.active {
  background-color: color-mix(in oklab, var(--color-foreground-dark) 90%, transparent);
  color: var(--color-background-dark);
}

/* ===== Mobile Menu ===== */
.mobile-menu-btn {
  display: block;
}

@media (min-width: 48rem) {
  .mobile-menu-btn {
    display: none;
  }
}

.mobile-menu {
  transform: translateX(100%);
  position: fixed;
  top: 0;
  right: 0;
  background-color: var(--color-background);
  height: 100vh;
  width: 83.3333%;
  padding: calc(var(--spacing) * 6) calc(var(--spacing) * 8);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 40;
  border-left: 1px solid var(--color-background);
}

.dark .mobile-menu {
  background-color: var(--color-background-dark);
}

@media (min-width: 48rem) {
  .mobile-menu {
    display: none;
  }
}

.mobile-menu.open {
  transform: translateX(0);
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.3), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
}

.mobile-close-btn {
  margin-left: auto;
  display: block;
}

.mobile-menu-links {
  display: flex;
  flex-direction: column;
  height: 100%;
  align-items: flex-start;
  gap: calc(var(--spacing) * 8);
  padding-top: calc(var(--spacing) * 16);
}

.mobile-link {
  font-size: 2.25rem;
  font-weight: 300;
}

.mobile-link.active {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 2px;
}

.dark .mobile-link.active {
  color: var(--color-primary-dark);
}

.mobile-theme-switcher {
  margin-top: calc(var(--spacing) * 4);
}

/* ===== Main Content ===== */
.main-content {
  padding-top: calc(var(--spacing) * 36);
}

@media (min-width: 64rem) {
  .main-content {
    padding-inline: calc(var(--spacing) * 16) !important;
  }
}

@media (min-width: 80rem) {
  .main-content {
    padding-inline: calc(var(--spacing) * 24) !important;
  }
}

@media (min-width: 96rem) {
  .main-content {
    padding-inline: calc(var(--spacing) * 32) !important;
  }
}

.page-title {
  font-size: 3.75rem;
  line-height: 1;
  padding-bottom: calc(var(--spacing) * 8);
  font-weight: 700;
}

.masthead-title {
  font-weight: 700;
  font-size: 2.5rem;
  line-height: 1.1;
  letter-spacing: -0.01em;
  padding-bottom: calc(var(--spacing) * 3);
}

@media (min-width: 48rem) {
  .masthead-title {
    font-size: 3.75rem;
  }
}

.masthead-tagline {
  font-size: 1.25rem;
  opacity: 0.7;
  padding-bottom: calc(var(--spacing) * 6);
}

/* ===== About Page ===== */
.about-section {
  padding-block: calc(var(--spacing) * 4) calc(var(--spacing) * 24);
  font-size: 1.125rem;
  line-height: 1.9;
}

@media (min-width: 64rem) {
  .about-section {
    padding-inline: calc(var(--spacing) * 16) !important;
  }
}

@media (min-width: 80rem) {
  .about-section {
    padding-inline: calc(var(--spacing) * 24) !important;
  }
}

@media (min-width: 96rem) {
  .about-section {
    padding-inline: calc(var(--spacing) * 32) !important;
  }
}

.about-body {
  max-width: 44rem;
}

.about-body p {
  margin-bottom: calc(var(--spacing) * 8);
}

.about-lead {
  padding-bottom: calc(var(--spacing) * 8);
  border-bottom: 1px solid color-mix(in oklab, var(--color-foreground) 25%, transparent);
}

.dark .about-lead {
  border-color: color-mix(in oklab, var(--color-foreground-dark) 25%, transparent);
}

.about-signoff {
  margin-top: calc(var(--spacing) * 12);
  padding-top: calc(var(--spacing) * 8);
  border-top: 1px solid color-mix(in oklab, var(--color-foreground) 25%, transparent);
}

.dark .about-signoff {
  border-color: color-mix(in oklab, var(--color-foreground-dark) 25%, transparent);
}

.about-signoff strong {
  font-weight: 600;
}

/* ===== Posts Grid ===== */
.posts-section {
  padding-block: calc(var(--spacing) * 16);
  margin-bottom: calc(var(--spacing) * 8);
}

@media (min-width: 64rem) {
  .posts-section {
    padding-inline: calc(var(--spacing) * 16) !important;
  }
}

@media (min-width: 80rem) {
  .posts-section {
    padding-inline: calc(var(--spacing) * 24) !important;
  }
}

@media (min-width: 96rem) {
  .posts-section {
    padding-inline: calc(var(--spacing) * 32) !important;
  }
}

.posts-grid {
  margin-block: calc(var(--spacing) * 6);
  gap: calc(var(--spacing) * 6);
  display: grid;
}

@media (min-width: 48rem) {
  .posts-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 80rem) {
  .posts-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ===== Post Card ===== */
.post-card {
  display: flex;
  flex-direction: column;
  gap: calc(var(--spacing) * 4);
  padding-bottom: calc(var(--spacing) * 8);
  height: 100%;
  transition: color 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

.post-image {
  object-fit: cover;
  border-radius: 0.75rem;
  aspect-ratio: 16 / 9;
  width: 100%;
}

.post-title {
  font-size: 1.5rem;
  line-height: calc(2 / 1.5);
  font-weight: 600;
  transition: color 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

@media (hover: hover) {
  .post-card:hover .post-title {
    color: var(--color-primary);
    text-decoration: underline;
  }

  .dark .post-card:hover .post-title {
    color: var(--color-primary-dark);
  }
}

.post-description {
  opacity: 0.8;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post-date {
  text-transform: uppercase;
  font-size: 0.875rem;
  line-height: calc(1.25 / 0.875);
  margin-top: auto;
  letter-spacing: -0.025em;
}

/* ===== Footer ===== */
footer {
  border-top: 2px solid;
  border-color: color-mix(in oklab, var(--color-foreground) 50%, transparent);
}

.dark footer {
  border-color: color-mix(in oklab, var(--color-foreground-dark) 50%, transparent);
}

.footer-inner {
  display: grid;
  gap: calc(var(--spacing) * 12);
  padding-block: calc(var(--spacing) * 16);
}

@media (min-width: 48rem) {
  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.footer-left {
  display: flex;
  align-items: center;
  gap: calc(var(--spacing) * 6);
}

.social-links {
  display: flex;
  flex-wrap: wrap;
  gap: calc(var(--spacing) * 4);
}

.social-link {
  transition: opacity 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

@media (hover: hover) {
  .social-link:hover {
    opacity: 0.7;
  }
}

.social-icon {
  width: 1.5rem;
  height: 1.5rem;
}

.footer-heading {
  font-weight: 600;
  font-size: 1.5rem;
  line-height: calc(2 / 1.5);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: calc(var(--spacing) * 4);
  margin-top: calc(var(--spacing) * 4);
}

.footer-link {
  font-size: 1.125rem;
  transition: opacity 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

@media (hover: hover) {
  .footer-link:hover {
    opacity: 0.7;
  }
}

/* ===== Empty State ===== */
.empty-state {
  text-align: center;
  opacity: 0.5;
  font-size: 1.15rem;
  padding: calc(var(--spacing) * 16) 0;
}

/* ===== Post image placeholder ===== */
.post-image-placeholder {
  background: color-mix(in oklab, var(--color-foreground) 10%, transparent);
  display: flex;
  align-items: center;
  justify-content: center;
}

.dark .post-image-placeholder {
  background: color-mix(in oklab, var(--color-foreground-dark) 10%, transparent);
}

/* ===== Members Page ===== */
.members-section {
  padding-block: calc(var(--spacing) * 8) calc(var(--spacing) * 24);
}

@media (min-width: 64rem) {
  .members-section {
    padding-inline: calc(var(--spacing) * 16) !important;
  }
}

@media (min-width: 80rem) {
  .members-section {
    padding-inline: calc(var(--spacing) * 24) !important;
  }
}

@media (min-width: 96rem) {
  .members-section {
    padding-inline: calc(var(--spacing) * 32) !important;
  }
}

.members-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: calc(var(--spacing) * 10);
  justify-items: center;
}

@media (min-width: 48rem) {
  .members-grid {
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  }
}

.member-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: calc(var(--spacing) * 3);
  padding: calc(var(--spacing) * 8) calc(var(--spacing) * 6);
  border-radius: 1rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  width: 100%;
}

@media (hover: hover) {
  .member-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
  }
}

.dark .member-card:hover {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.member-avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background-color: #fff;
  border: 1px solid color-mix(in oklab, var(--color-foreground) 12%, transparent);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.dark .member-avatar {
  background-color: #3d3d3d;
  border-color: color-mix(in oklab, var(--color-foreground-dark) 15%, transparent);
}

.member-name {
  font-size: 1.25rem;
  font-weight: 600;
  margin-top: calc(var(--spacing) * 2);
}

.member-role {
  font-size: 0.95rem;
  opacity: 0.7;
  text-align: center;
}