/* Theme mirrors harishchandran.com: paper/ink palette, dotted grid, dotted rules. */

:root {
  --ink: 60 3% 8%;
  --paper: 50 17% 93%;

  --background: var(--paper);
  --foreground: var(--ink);
  --muted: 50 12% 87%;
  --muted-foreground: 60 3% 36%;
  --card: 50 17% 96%;
  --border: 50 8% 74%;
  --primary: var(--ink);
  --grid-dot: hsl(var(--foreground) / 0.18);

  --font-display: "Stack Sans Notch", system-ui, -apple-system, sans-serif;
  --font-body: "Vend Sans", system-ui, -apple-system, sans-serif;

  color-scheme: light;
}

:root.dark {
  --background: var(--ink);
  --foreground: var(--paper);
  --muted: 60 3% 14%;
  --muted-foreground: 50 10% 66%;
  --card: 60 3% 11%;
  --border: 60 3% 24%;
  --primary: var(--paper);
  --grid-dot: hsl(var(--foreground) / 0.16);

  color-scheme: dark;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background-color: hsl(var(--background));
  color: hsl(var(--foreground));
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.3s, color 0.3s;
}

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

main {
  position: relative;
  overflow-x: clip;
}

.grid-bg {
  pointer-events: none;
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image: radial-gradient(circle at 1px 1px, var(--grid-dot) 1px, transparent 0);
  background-size: 40px 40px;
  opacity: 0.2;
}

.container {
  max-width: 64rem;
  margin: 0 auto;
  padding: 0 1.25rem;
}

@media (min-width: 768px) {
  .container {
    padding: 0 2rem;
  }
}

/* ---------- theme toggle ---------- */

.theme-toggle {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  border: 2px dotted hsl(var(--muted-foreground));
  background: hsl(var(--background) / 0.8);
  color: hsl(var(--muted-foreground));
  backdrop-filter: blur(8px);
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}

.theme-toggle:hover {
  border-color: hsl(var(--foreground));
  color: hsl(var(--foreground));
}

.theme-toggle svg {
  width: 1.1rem;
  height: 1.1rem;
}

.theme-toggle .icon-sun {
  display: none;
}

:root.dark .theme-toggle .icon-sun {
  display: block;
}

:root.dark .theme-toggle .icon-moon {
  display: none;
}

/* ---------- hero ---------- */

.hero {
  padding-top: 8rem;
}

.hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(3rem, 8vw, 5.12rem);
  line-height: 0.95;
}

.hero p {
  margin: 1.5rem 0 0;
  max-width: 36rem;
  font-size: 1.125rem;
  line-height: 1.75rem;
  color: hsl(var(--muted-foreground));
}

.hero p a {
  color: hsl(var(--foreground));
  border-bottom: 1px dotted hsl(var(--muted-foreground));
}

.hero p a:hover {
  border-color: hsl(var(--foreground));
}

.jump {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  margin-top: 2rem;
  font-size: 0.875rem;
}

.jump a {
  color: hsl(var(--muted-foreground));
  border-bottom: 1px dotted hsl(var(--muted-foreground));
  padding-bottom: 2px;
  transition: color 0.15s, border-color 0.15s;
}

.jump a:hover {
  color: hsl(var(--foreground));
  border-color: hsl(var(--foreground));
}

.jump .count {
  margin-left: 0.35rem;
  font-variant-numeric: tabular-nums;
}

/* ---------- sections ---------- */

section {
  padding-top: 6rem;
  scroll-margin-top: 1rem;
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.125rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.section-sub {
  margin: 0.4rem 0 0;
  font-size: 0.875rem;
  color: hsl(var(--muted-foreground));
}

/* ---------- working-on cards ---------- */

.cards {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .cards {
    grid-template-columns: 1fr 1fr;
  }
}

.card {
  display: flex;
  flex-direction: column;
  border: 1px solid hsl(var(--border));
  background: hsl(var(--card) / 0.6);
  padding: 1.25rem;
  transition: border-color 0.15s, transform 0.2s;
}

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

.card h3 {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.card p {
  margin: 0.5rem 0 0;
  font-size: 0.875rem;
  line-height: 1.625;
  color: hsl(var(--muted-foreground));
}

.card .meta {
  margin-top: auto;
  padding-top: 1rem;
}

.progress {
  margin-top: 1rem;
  height: 6px;
  border: 1px dotted hsl(var(--muted-foreground));
  position: relative;
}

.progress span {
  position: absolute;
  inset: 0 auto 0 0;
  background: hsl(var(--foreground));
}

.status {
  display: inline-block;
  font-size: 0.6875rem;
  line-height: 1;
  padding: 0.25rem 0.4rem;
  border: 1px dotted hsl(var(--muted-foreground));
  color: hsl(var(--muted-foreground));
  font-weight: 400;
  white-space: nowrap;
}

/* ---------- list rows ---------- */

.rows {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px dotted hsl(var(--border));
}

.rows li {
  border-bottom: 1px dotted hsl(var(--border));
}

.row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1rem 0;
}

.row-main {
  min-width: 0;
}

.row-title {
  display: block;
}

.row-title .arrow {
  display: inline-block;
  margin-left: 0.3rem;
  vertical-align: -0.05em;
}

.row-title .name {
  font-weight: 600;
  border-bottom: 1px dotted hsl(var(--muted-foreground));
  padding-bottom: 2px;
  transition: border-color 0.15s;
}

a.row:hover .name,
.row-title a.name:hover {
  border-color: hsl(var(--foreground));
}

.row-title .order {
  display: inline-block;
  min-width: 1.75rem;
  font-size: 0.75rem;
  font-variant-numeric: tabular-nums;
  color: hsl(var(--muted-foreground));
}

.numbered .row-authors,
.numbered .row-desc {
  padding-left: 1.75rem;
}

.row-title .plain {
  font-weight: 600;
}

.arrow {
  width: 0.875rem;
  height: 0.875rem;
  flex-shrink: 0;
  color: hsl(var(--muted-foreground));
}

.row-desc {
  display: block;
  margin-top: 0.25rem;
  font-size: 0.875rem;
  line-height: 1.625;
  color: hsl(var(--muted-foreground));
}

.row-authors {
  display: block;
  margin-top: 0.25rem;
  font-size: 0.8125rem;
  color: hsl(var(--muted-foreground));
}

.row-links {
  display: flex;
  gap: 1rem;
  margin-top: 0.5rem;
  font-size: 0.8125rem;
}

.row-links a {
  color: hsl(var(--muted-foreground));
  border-bottom: 1px dotted hsl(var(--muted-foreground));
}

.row-links a:hover {
  color: hsl(var(--foreground));
  border-color: hsl(var(--foreground));
}

.meta {
  flex-shrink: 0;
  white-space: nowrap;
  padding-top: 0.25rem;
  font-size: 0.75rem;
  color: hsl(var(--muted-foreground));
}

.meta .dot {
  margin: 0 0.5rem;
}

.empty {
  padding: 1.5rem 0;
  font-size: 0.875rem;
  color: hsl(var(--muted-foreground));
}

@media (max-width: 560px) {
  .row {
    flex-direction: column;
    gap: 0.5rem;
  }

  .row .meta {
    padding-top: 0;
    white-space: normal;
  }
}

/* ---------- filters ---------- */

[hidden] {
  display: none !important;
}

.filters {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.search {
  flex: 1 1 14rem;
  min-width: 0;
  font: inherit;
  font-size: 0.875rem;
  padding: 0.45rem 0.6rem;
  background: hsl(var(--background) / 0.6);
  color: hsl(var(--foreground));
  border: 1px dotted hsl(var(--muted-foreground));
  outline: none;
}

.search:focus {
  border-style: solid;
  border-color: hsl(var(--foreground));
}

.search::placeholder {
  color: hsl(var(--muted-foreground));
}

.chip {
  font: inherit;
  font-size: 0.75rem;
  padding: 0.3rem 0.55rem;
  background: transparent;
  color: hsl(var(--muted-foreground));
  border: 1px dotted hsl(var(--muted-foreground));
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s, background-color 0.15s;
}

.chip:hover {
  color: hsl(var(--foreground));
  border-color: hsl(var(--foreground));
}

.chip[aria-pressed="true"] {
  background: hsl(var(--foreground));
  border: 1px solid hsl(var(--foreground));
  color: hsl(var(--background));
}

/* ---------- cube button (from the reference site) ---------- */

.btn {
  display: inline-block;
  color: hsl(var(--foreground));
  letter-spacing: 0.1em;
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 700;
  background: none;
  border: 0;
  padding: 0.7em 1em;
  cursor: pointer;
  margin-top: 2rem;
}

.cube {
  position: relative;
  transition: all 0.5s;
}

.cube .bg-top {
  position: absolute;
  bottom: 100%;
  left: 5px;
  right: -5px;
  height: 10px;
  background: hsl(var(--primary));
  transform: skew(-45deg);
  transition: all 0.4s;
}

.cube .bg-top .bg-inner {
  bottom: 0;
}

.cube .bg {
  position: absolute;
  inset: 0;
  background: hsl(var(--primary));
  transition: all 0.4s;
}

.cube .bg-right {
  position: absolute;
  z-index: 0;
  top: -5px;
  bottom: 5px;
  left: 100%;
  width: 10px;
  background: hsl(var(--primary));
  transform: skewY(-45deg);
  transition: all 0.4s;
}

.cube .bg-right .bg-inner {
  left: 0;
}

.cube .bg-inner {
  position: absolute;
  inset: 2px;
  background: hsl(var(--background));
}

.cube .text {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.4s;
}

.cube .text svg {
  width: 1.25rem;
  height: 1.25rem;
}

.cube:hover .bg-inner {
  background: hsl(var(--primary));
  transition: all 0.4s;
}

.cube:hover .text {
  color: hsl(var(--background));
}

/* ---------- footer ---------- */

footer {
  padding: 6rem 0 5rem;
}

footer p {
  margin: 1.5rem 0 0;
  max-width: 36rem;
  font-size: 1.125rem;
  line-height: 1.75rem;
  color: hsl(var(--muted-foreground));
}

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  margin-top: 1.5rem;
  font-size: 0.875rem;
}

.links a {
  border-bottom: 1px dotted hsl(var(--muted-foreground));
  padding-bottom: 2px;
}

.links a:hover {
  border-color: hsl(var(--foreground));
}

/* ---------- entrance ---------- */

.fade {
  opacity: 0;
  transform: translateY(8px);
  animation: fade-in 0.6s ease forwards;
}

@keyframes fade-in {
  to {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .fade {
    animation: none;
    opacity: 1;
    transform: none;
  }

  html {
    scroll-behavior: auto;
  }
}