:root {
  --color-bg: #0d1117;
  --color-surface: #161b22;
  --color-border: #21262d;
  --color-border-hover: #30363d;
  --color-text: #c9d1d9;
  --color-text-bright: #f0f6fc;
  --color-text-muted: #9da5ad;
  --color-accent: #58a6ff;

  --text-xl: 2rem;
  --text-base: 1rem;
  --text-sm: 0.8rem;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  position: relative;
}

#checkboxes {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  display: grid;
  grid-template-columns: repeat(var(--cols), 13px);
  gap: 6px;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

#checkboxes input[type="checkbox"] {
  appearance: auto;
  width: 13px;
  height: 13px;
  margin: 0;
  padding: 0;
  opacity: 0.12;
  pointer-events: auto;
  cursor: pointer;
}

main {
  max-width: 640px;
  margin: 0 auto;
  padding: 4rem 1.5rem;
  position: relative;
  z-index: 1;
  pointer-events: none;
}

main .card, main a, main input {
  pointer-events: auto;
}

header {
  margin-bottom: 3rem;
}

h1 {
  font-size: var(--text-xl);
  color: var(--color-text-bright);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.tagline {
  margin-top: 0.75rem;
  font-size: var(--text-base);
  color: var(--color-text);
}

.header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.motion-toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  cursor: pointer;
  white-space: nowrap;
}

.motion-toggle input[type="checkbox"] {
  appearance: auto;
  width: 24px;
  height: 24px;
  cursor: pointer;
}

nav {
  margin-top: 1.25rem;
  display: flex;
  gap: 1.5rem;
}

nav a {
  color: var(--color-accent);
  text-decoration: none;
  font-size: var(--text-base);
  font-weight: 500;
}

nav a:hover {
  text-decoration: underline;
}

h2 {
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: 1rem;
  margin-top: 2.5rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  width: fit-content;
  margin-left: auto;
  margin-right: auto;
  padding: 0.4rem 0.6rem;
  border-radius: 8px;
}

h2 input[type="checkbox"] {
  appearance: auto;
  width: 13px;
  height: 13px;
  margin: 0;
  opacity: 0.5;
}

.card {
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1.25rem;
  margin-bottom: 0.75rem;
  background: var(--color-surface);
  transition: border-color 0.15s;
  display: flex;
  gap: 1rem;
  align-items: start;
}

.card.expandable {
  display: block;
  position: relative;
}

.card-header {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  cursor: pointer;
  position: relative;
}

.card-header:not(:has(:checked))::before {
  content: '?';
  position: absolute;
  left: 0;
  width: 18px;
  height: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-text);
  pointer-events: none;
}

.card-header input[type="checkbox"] {
  appearance: auto;
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  cursor: pointer;
}

.card-header input[type="checkbox"]:not(:checked) {
  opacity: 0.5;
  transition: opacity 0.15s;
}

.card-header:hover input[type="checkbox"]:not(:checked) {
  opacity: 0.8;
}

.card-expand {
  display: grid;
  grid-template-rows: minmax(1.5rem, 0fr);
  transition: grid-template-rows 0.25s ease;
  position: relative;
}

.card-expand::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1rem;
  background: linear-gradient(to bottom, transparent, var(--color-surface));
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.card-header:has(:checked) + .card-expand::after {
  opacity: 0;
}

.card-expand > .card-expand-inner {
  overflow: hidden;
  display: flex;
  gap: 1rem;
  align-items: start;
}

.card-header:has(:checked) + .card-expand {
  grid-template-rows: minmax(1.5rem, 1fr);
}

.card-expand-inner {
  padding-top: 0.75rem;
}

.card .thumb {
  width: 160px;
  aspect-ratio: 16 / 9;
  border-radius: 6px;
  object-fit: cover;
  flex-shrink: 0;
}

.card .card-body {
  flex: 1;
  min-width: 0;
}

.card-expand-inner > :first-child,
.card .card-body > :first-child {
  margin-top: 0;
}

.card:hover {
  border-color: var(--color-border-hover);
}

.header-card {
  display: block;
}

.card h3 {
  font-size: var(--text-base);
  color: var(--color-text-bright);
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.5rem;
  flex: 1;
}

.meta {
  font-weight: 400;
  color: var(--color-text);
  font-size: var(--text-sm);
  text-align: right;
  white-space: nowrap;
}

.card p {
  margin-top: 0.4rem;
  font-size: var(--text-base);
  color: var(--color-text);
}

.card a {
  color: var(--color-accent);
  text-decoration: none;
}

.card a:hover {
  text-decoration: underline;
}

.link {
  display: inline-block;
  margin-top: 0.5rem;
  margin-right: 1rem;
  font-size: var(--text-base);
  font-weight: 500;
}

.link:last-child {
  margin-right: 0;
}

.contact-email {
  color: var(--color-accent);
  text-decoration: none;
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

#checkboxes input:focus-visible {
  border-radius: 4px;
}

@media (max-width: 480px) {
  .card-expand > .card-expand-inner {
    flex-direction: column;
  }

  .card .thumb {
    width: 100%;
  }

  .card h3 {
    flex-direction: column;
    gap: 0.15rem;
  }

  .meta {
    text-align: left;
  }
}