/*
 * shivshankar.dev
 *
 * Static, readable, and deliberately low-maintenance.
 * No JavaScript. No framework. No build step.
 */

:root {
  --surface: #f7f7f4;
  --surface-quiet: #eef2ee;
  --surface-raised: #ffffff;
  --text: #171817;
  --text-secondary: #5d6462;
  --rule: #d8ded9;
  --rule-strong: #c3cbc5;
  --link: #123f75;
  --accent: #0f6f64;
  --accent-warm: #7c4a21;
  --selection-bg: #171817;
  --selection-fg: #f7f7f4;
}

@media (prefers-color-scheme: dark) {
  :root {
    --surface: #101214;
    --surface-quiet: #151a1a;
    --surface-raised: #171b1b;
    --text: #e7e7e2;
    --text-secondary: #a2aaa6;
    --rule: #29302e;
    --rule-strong: #3a4441;
    --link: #8bb8ff;
    --accent: #67d6c5;
    --accent-warm: #f0b06b;
    --selection-bg: #e7e7e2;
    --selection-fg: #101214;
  }
}

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

::selection {
  background: var(--selection-bg);
  color: var(--selection-fg);
}

html {
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  min-height: 100dvh;
  background: var(--surface);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  font-size: 1rem;
  line-height: 1.65;
}

main {
  width: min(100% - 2.5rem, 76ch);
  max-width: 76ch;
  margin-inline: auto;
  padding: 12vh 0 9rem;
}

.hero {
  max-width: 66ch;
}

h1 {
  margin-bottom: 0.375rem;
  font-size: 1.625rem;
  font-weight: 650;
  letter-spacing: 0;
  line-height: 1.2;
}

h2 {
  margin-bottom: 1rem;
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-weight: 650;
  letter-spacing: 0;
  line-height: 1.3;
  text-transform: uppercase;
}

h3 {
  margin-bottom: 0.2rem;
  font-size: 1rem;
  font-weight: 650;
  letter-spacing: 0;
  line-height: 1.4;
}

p {
  margin-bottom: 0.875rem;
  font-size: 1.0625rem;
  line-height: 1.65;
}

p:last-child {
  margin-bottom: 0;
}

strong {
  font-weight: 650;
}

.tagline {
  color: var(--text-secondary);
  font-size: 0.98rem;
  line-height: 1.55;
}

.timestamp {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

hr {
  margin: 2.75rem 0;
  border: 0;
  border-top: 1px solid var(--rule);
}

a {
  color: var(--link);
  text-decoration-line: underline;
  text-decoration-color: color-mix(in srgb, var(--link) 35%, transparent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
  transition: color 150ms ease, text-decoration-color 150ms ease;
}

a:hover,
a:focus-visible {
  color: var(--text);
  text-decoration-color: var(--text);
}

a:focus-visible {
  border-radius: 2px;
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.signal-list {
  display: grid;
  gap: 0.45rem;
  margin-top: 1.4rem;
  list-style: none;
}

.signal-list li {
  position: relative;
  padding-left: 1rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.5;
}

.signal-list li::before {
  position: absolute;
  top: 0.65em;
  left: 0;
  width: 0.35rem;
  height: 0.35rem;
  border-radius: 999px;
  background: var(--accent);
  content: "";
}

nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

nav span {
  color: var(--text-secondary);
  font-size: 0.875rem;
  user-select: none;
}

nav a {
  font-size: 0.875rem;
}

.primary-actions {
  margin-top: 1.45rem;
  gap: 0.65rem;
}

.primary-actions a {
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 550;
  text-decoration-color: var(--rule);
}

.outbound {
  margin-top: 1rem;
}

.outbound a {
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 550;
  text-decoration-color: var(--rule);
}

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

.section-kicker h2 {
  margin-bottom: 0;
}

.section-kicker a {
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 550;
  text-decoration-color: var(--rule);
  white-space: nowrap;
}

.ledger-intro {
  max-width: 62ch;
  color: var(--text-secondary);
  font-size: 0.98rem;
}

.ledger-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  margin-top: 1.35rem;
  border: 1px solid var(--rule);
  background: var(--surface-raised);
}

.ledger-grid-wide {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 0;
}

.ledger-card {
  display: grid;
  min-height: 10.25rem;
  align-content: start;
  gap: 0.55rem;
  padding: 1.1rem;
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  color: var(--text-secondary);
  text-decoration: none;
}

.ledger-grid:not(.ledger-grid-wide) .ledger-card:nth-child(3n),
.ledger-grid-wide .ledger-card:nth-child(2n) {
  border-right: 0;
}

.ledger-grid:not(.ledger-grid-wide) .ledger-card:nth-last-child(-n + 3),
.ledger-grid-wide .ledger-card:nth-last-child(-n + 2) {
  border-bottom: 0;
}

.ledger-card:hover,
.ledger-card:focus-visible {
  background: var(--surface-quiet);
  color: var(--text-secondary);
}

.ledger-card:focus-visible {
  border-radius: 2px;
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.ledger-card strong {
  color: var(--text);
  font-size: 1rem;
  line-height: 1.35;
}

.ledger-card span:last-child {
  font-size: 0.9rem;
  line-height: 1.5;
}

.ledger-label {
  color: var(--accent-warm);
  font-family: ui-monospace, "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.68rem;
  font-weight: 650;
  letter-spacing: 0.04em;
  line-height: 1;
  text-transform: uppercase;
}

.compact-list,
.writing-list {
  display: grid;
  gap: 0.65rem;
  margin-top: 1rem;
  padding-left: 1.2rem;
}

.compact-list li,
.writing-list li {
  padding-left: 0.25rem;
  color: var(--text-secondary);
}

.writing-list .timestamp {
  display: block;
  margin-top: 0.15rem;
}

.proof-list,
.work-list,
.principle-grid {
  display: grid;
  gap: 0;
}

.proof-list div,
.work-list article,
.principle-grid div {
  padding: 1rem 0;
  border-top: 1px solid var(--rule);
}

.proof-list div:first-child,
.work-list article:first-child,
.principle-grid div:first-child {
  padding-top: 0;
  border-top: 0;
}

dt {
  margin-bottom: 0.25rem;
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 650;
}

dd,
.work-list p {
  color: var(--text-secondary);
  font-size: 0.96rem;
  line-height: 1.6;
}

.principle-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--rule);
}

.principle-grid div,
.principle-grid div:first-child {
  padding: 1rem;
  border-top: 0;
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}

.principle-grid div:nth-child(2n) {
  border-right: 0;
}

.principle-grid div:nth-last-child(-n + 2) {
  border-bottom: 0;
}

.back {
  margin-bottom: 2rem;
}

.back a {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.essay header {
  margin-bottom: 2rem;
}

.essay h1 {
  margin-bottom: 0.7rem;
}

.essay h2 {
  margin-top: 2.25rem;
}

.essay ul {
  display: grid;
  gap: 0.7rem;
  margin: 1rem 0 0;
  padding-left: 1.2rem;
}

.essay li {
  padding-left: 0.2rem;
}

.edge-link {
  position: fixed;
  z-index: 10;
  top: 50%;
  right: 2.5rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  color: var(--text);
  font-size: 0.75rem;
  font-weight: 650;
  letter-spacing: 0;
  text-decoration: none;
  text-transform: uppercase;
  transform: translateY(-50%);
  transition: color 200ms ease, transform 250ms ease;
  writing-mode: vertical-rl;
}

.edge-link::after {
  display: block;
  width: 1px;
  height: 48px;
  background: var(--text);
  content: "";
  opacity: 0.4;
  transition: height 250ms ease, opacity 250ms ease;
}

.edge-link:hover,
.edge-link:focus-visible {
  color: var(--text);
  transform: translateY(-50%) translateX(-4px);
}

.edge-link:hover::after,
.edge-link:focus-visible::after {
  height: 72px;
  opacity: 1;
}

@media (max-width: 768px) {
  main {
    width: min(100% - 2rem, 76ch);
    padding: 12vh 0 6rem;
  }

  h1 {
    font-size: 1.45rem;
  }

  p {
    font-size: 1rem;
    line-height: 1.625;
  }

  .primary-actions {
    display: block;
  }

  .primary-actions a {
    display: inline-block;
    margin-right: 0.75rem;
    margin-bottom: 0.35rem;
  }

  .primary-actions span {
    display: none;
  }

  .section-kicker {
    display: grid;
    gap: 0.4rem;
  }

  .ledger-grid,
  .ledger-grid-wide,
  .principle-grid {
    grid-template-columns: 1fr;
  }

  .ledger-card,
  .ledger-grid:not(.ledger-grid-wide) .ledger-card:nth-child(3n),
  .ledger-grid-wide .ledger-card:nth-child(2n) {
    min-height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--rule);
  }

  .ledger-grid:not(.ledger-grid-wide) .ledger-card:nth-last-child(-n + 3),
  .ledger-grid-wide .ledger-card:nth-last-child(-n + 2) {
    border-bottom: 1px solid var(--rule);
  }

  .ledger-grid:not(.ledger-grid-wide) .ledger-card:last-child,
  .ledger-grid-wide .ledger-card:last-child {
    border-bottom: 0;
  }

  .principle-grid div,
  .principle-grid div:first-child,
  .principle-grid div:nth-child(2n),
  .principle-grid div:nth-last-child(-n + 2) {
    padding-inline: 0;
    border-right: 0;
    border-bottom: 1px solid var(--rule);
  }

  .principle-grid div:last-child {
    border-bottom: 0;
  }

  .edge-link {
    top: auto;
    right: 1rem;
    bottom: 2rem;
    gap: 0.75rem;
    font-size: 0.7rem;
    transform: none;
  }

  .edge-link::after {
    height: 24px;
  }

  .edge-link:hover,
  .edge-link:focus-visible {
    transform: translateY(-4px);
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition-duration: 0.01ms !important;
  }
}

@media print {
  body {
    background: #fff;
    color: #000;
  }

  main {
    max-width: none;
    padding: 2cm 0;
  }

  a {
    color: #000;
    text-decoration: none;
  }

  a[href^="http"]::after,
  a[href^="mailto"]::after {
    color: #555;
    content: " <" attr(href) ">";
    font-size: 0.75em;
    font-weight: 400;
  }

  hr,
  .proof-list div,
  .work-list article {
    border-color: #ddd;
  }

  nav span {
    color: #999;
  }

  .edge-link {
    display: none;
  }
}