/* ============================================================
   Harsh Jain - personal site
   Newsreader serif, 620px reading column,
   warm-neutral palette, dark by default.
   ============================================================ */

:root {
  --max-width: 620px;            /* 38.75rem reading column */
  --pad-x: 24px;
  --pad-y: 48px;

  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 48px;
  --space-6: 64px;
  --space-7: 96px;

  --serif: "Newsreader", "Times New Roman", Times, serif;
}

/* Theme: dark (default): slate on ivory */
:root,
:root[data-theme="dark"] {
  --bg: #1f1e1d;
  --fg: #f0eee6;
  --muted: rgba(240, 238, 230, 0.62);
  --muted-strong: rgba(240, 238, 230, 0.82);
  --hover: #b0aea5;              /* link hover */
  --rule: #3d3d3a;
  --link: #f0eee6;
  --link-underline: rgba(240, 238, 230, 0.45);
  --selection: rgba(0, 100, 255, 0.32);
  --footnote-bg: rgba(255, 255, 255, 0.15);
  --footnote-tooltip-bg: #3d3d3a;
  --footnote-tooltip-fg: #f0eee6;
  --footnote-tooltip-border: #5e5d59;
}

/* Theme: light: inverted */
:root[data-theme="light"] {
  --bg: #f0eee6;
  --fg: #1f1e1d;
  --muted: rgba(31, 30, 29, 0.62);
  --muted-strong: rgba(31, 30, 29, 0.78);
  --hover: #5e5d59;              /* link hover */
  --rule: #d1cfc5;
  --link: #1f1e1d;
  --link-underline: rgba(31, 30, 29, 0.4);
  --selection: rgba(0, 100, 255, 0.26);
  --footnote-bg: rgba(0, 0, 0, 0.08);
  --footnote-tooltip-bg: #faf9f5;
  --footnote-tooltip-fg: #1f1e1d;
  --footnote-tooltip-border: #d1cfc5;
}

/* ---------- base ---------- */

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--serif);
  font-size: 20px;
  line-height: 1.6;
  text-align: left;
  transition: background-color 200ms ease, color 200ms ease;
}

::selection {
  background: var(--selection);
  color: inherit;
}

a {
  color: var(--link);
  text-decoration: underline;
  text-decoration-color: var(--link-underline);
  text-underline-offset: 0.1em;
  text-decoration-thickness: 0.08em;
  transition: color 200ms ease, text-decoration-color 200ms ease;
}
a:hover {
  color: var(--hover);
  text-decoration-color: var(--hover);
}

p {
  margin: 0 0 1em 0;
  text-wrap: pretty;
}

/* ---------- page shell ---------- */

.site {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 16px var(--pad-x) calc(var(--pad-y) * 1.5);
}

/* ---------- top bar (home: name + toggle) ---------- */

.header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background-color: var(--bg);
  transition: background-color 200ms ease;
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 24px var(--pad-x) 16px var(--pad-x);
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.site-title {
  font-family: var(--serif);
  font-size: 29px;
  line-height: 1.1;
  font-weight: 700;
  margin: 0;
  letter-spacing: -0.005em;
}
.site-title a {
  color: var(--fg);
  text-decoration: none;
}

/* ---------- theme toggle (pill switch): 38x18, knob 14x14 */
.theme-toggle {
  appearance: none;
  position: relative;
  display: inline-block;
  width: 38px;
  height: 18px;
  padding: 0;
  margin: 0;
  border-radius: 999px;
  border: 1.5px solid var(--fg);
  background: transparent;
  cursor: pointer;
  flex-shrink: 0;
  vertical-align: middle;
  transition: background-color 200ms ease, border-color 200ms ease;
  -webkit-tap-highlight-color: transparent;
}
.theme-toggle::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 1px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--fg);
  transform: translateY(-50%);
  transition: left 220ms cubic-bezier(.4, 0, .2, 1), background-color 200ms ease;
}
:root[data-theme="dark"] .theme-toggle {
  background: var(--fg);
}
:root[data-theme="dark"] .theme-toggle::after {
  left: calc(100% - 15px);
  background: var(--bg);
}
.theme-toggle:focus-visible {
  outline: 2px solid var(--fg);
  outline-offset: 3px;
}

/* ---------- homepage ---------- */

.home-intro {
  font-size: 20px;
  line-height: 1.6;
  margin: 0 0 var(--space-6) 0;
}
.home-intro p { margin: 0 0 1em 0; }
.home-intro p:last-child { margin-bottom: 0; }

.section {
  margin-top: var(--space-6);
}

.section-title {
  font-size: 24px;
  line-height: 1.2;
  font-weight: 700;
  margin: 0 0 var(--space-3) 0;
}

.essay-list,
.contact-list {
  list-style: none;
  margin: 0;
  padding-left: 0;
}
.essay-list li,
.contact-list li {
  margin: 0 0 var(--space-2) 0;
}
.essay-list a { font-size: 20px; line-height: 1.4; }
.contact-list a { font-size: 20px; }

.contact-primary {
  margin-bottom: var(--space-2);
  font-size: 20px;
  line-height: 1.4;
}

.essays-empty {
  font-size: 20px;
  line-height: 1.4;
  color: var(--muted);
  margin: 0;
}

.external::after {
  content: " \2197";
  display: inline-block;
  margin-left: 2px;
  font-size: 0.85em;
  text-decoration: none;
}

/* Tiny utility links (privacy) */
.utility {
  margin-top: var(--space-7);
  font-size: 16px;
  color: var(--muted);
}
.utility a {
  color: var(--muted);
  text-decoration-color: var(--rule);
}
.utility a:hover {
  color: var(--fg);
  text-decoration-color: var(--fg);
}

/* ============================================================
   Essay page
   ============================================================ */

/* Table of contents button (.menu-btn) */
.menu-btn {
  appearance: none;
  background: transparent;
  border: 0;
  padding: 0;
  margin: 0;
  width: 44px;
  height: 44px;
  color: var(--fg);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  -webkit-tap-highlight-color: transparent;
}
.menu-btn:focus-visible {
  outline: 2px solid var(--fg);
  outline-offset: 4px;
}

.essay-page .menu-btn {
  position: fixed;
  top: 18px;
  left: 12px;
  z-index: 110;
}

.menu-icon {
  position: relative;
  display: inline-block;
  width: 18px;
  height: 14px;
}
.menu-icon span {
  position: absolute;
  left: 0;
  right: 0;
  height: 1.5px;
  background: currentColor;
  transition: transform 200ms ease, opacity 160ms ease, top 200ms ease;
}
.menu-icon span:nth-child(1) { top: 0; }
.menu-icon span:nth-child(2) { top: 6px; }
.menu-icon span:nth-child(3) { top: 12px; }
.menu-btn[aria-expanded="true"] .menu-icon span:nth-child(1) { top: 6px; transform: rotate(45deg); }
.menu-btn[aria-expanded="true"] .menu-icon span:nth-child(2) { opacity: 0; }
.menu-btn[aria-expanded="true"] .menu-icon span:nth-child(3) { top: 6px; transform: rotate(-45deg); }

/* ---------- Article ---------- */
.essay {
  padding-top: var(--space-6);
  margin-bottom: var(--space-7);
}
.essay-header {
  margin-bottom: var(--space-4);
}
.essay-title {
  font-size: clamp(50px, 6.8vw, 68px);
  line-height: 1.1;
  font-weight: 700;
  margin: 0 0 0.2em 0;
  letter-spacing: -0.015em;
  text-wrap: balance;
}
.essay-subtitle {
  font-size: 30px;
  line-height: 1.3;
  font-style: italic;
  color: var(--fg);
  margin: 0;
  text-wrap: balance;
}
.essay-date {
  font-size: 20px;
  color: var(--muted);
  margin: var(--space-3) 0 0 0;
}

.essay-body {
  font-size: 20px;
  line-height: 1.6;
  margin-top: var(--space-4);
}
.essay-body h2 {
  font-size: 1.6em;
  font-weight: 600;
  line-height: 1.2;
  margin: 1.8em 0 0.5em 0;
  scroll-margin-top: 130px;
  text-wrap: balance;
}
.essay-body h3 {
  font-size: 1.2em;
  font-weight: 600;
  line-height: 1.2;
  margin: 1.4em 0 0.7em 0;
  scroll-margin-top: 130px;
  text-wrap: balance;
}
.essay-body h3 em,
.essay-body h3 i {
  font-style: italic;
}
.essay-body p { margin: 0 0 1em 0; }
.essay-body blockquote {
  margin: 1.4em 0;
  padding: 0 0 0 var(--space-3);
  border-left: 2px solid var(--rule);
  color: var(--muted-strong);
  font-style: italic;
}
/* Asterism divider: typographic section break */
hr.dinkus {
  border: 0;
  height: auto;
  margin: 2em 0;
}
hr.dinkus::after {
  content: "\2042";
  display: block;
  font-family: var(--serif);
  font-weight: 300;
  font-size: 1.5em;
  text-align: center;
  color: var(--muted-strong);
  letter-spacing: 0.3em;
}

/* Centered essay footer */
.essay-footer {
  text-align: center;
  margin-top: var(--space-7);
  padding-bottom: var(--space-5);
}
.essay-footer p {
  margin: 0 0 var(--space-4) 0;
  font-size: 20px;
}
.essay-footer p:last-child {
  margin-bottom: 0;
}
.essay-footer a {
  color: var(--fg);
  text-decoration: underline;
  text-decoration-color: var(--link-underline);
  text-underline-offset: 4px;
}
.essay-footer a:hover { text-decoration-color: var(--fg); }

/* ---------- Contents drawer ---------- */

.contents {
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  width: 368px;
  max-width: 88vw;
  background: var(--bg);
  padding: 130px 25px 40px 36px;
  transform: translateX(-100%);
  transition: transform 240ms cubic-bezier(.4, 0, .2, 1);
  z-index: 50;
  overflow-y: auto;
}
.contents.open {
  transform: translateX(0);
}
.contents h3 {
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--fg);
  margin: 0 0 var(--space-4) 0;
}

.contents-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.contents-list { counter-reset: contents; }
.contents-list li {
  counter-increment: contents;
  margin: 0 0 var(--space-2) 0;
  display: flex;
  gap: 8px;
  align-items: baseline;
  color: var(--muted-strong);
  line-height: 1.35;
}
.contents-list li::before {
  content: counter(contents) ".";
  color: var(--muted-strong);
  font-variant-numeric: tabular-nums;
  flex-shrink: 0;
  min-width: 1.4em;
}
.contents-list a {
  color: var(--muted-strong);
  text-decoration: none;
  font-size: 18px;
  transition: color 160ms ease, opacity 160ms ease, font-weight 160ms ease;
}
.contents-list a:hover {
  color: var(--fg);
}
.contents-list a.active,
.contents-list a[aria-current="true"] {
  color: var(--fg);
  font-weight: 500;
}

.contents-scrim {
  position: fixed;
  inset: 0;
  background: transparent;
  pointer-events: none;
  z-index: 40;
}
.contents-scrim.open {
  pointer-events: auto;
}

@media (min-width: 992px) {
  .essay-page .contents {
    width: 22%;
    max-width: 23rem;
  }
}

@media (min-width: 992px) and (max-width: 1330px) {
  .essay-page .contents {
    width: 20%;
  }
}

@media (max-width: 991px) {
  body.contents-open {
    overflow: hidden;
  }
}

/* ============================================================
   Privacy page
   ============================================================ */
.privacy-body {
  font-size: 20px;
  line-height: 1.6;
  max-width: 520px;
}

/* ============================================================
   Mobile
   ============================================================ */
@media (max-width: 640px) {
  body { font-size: 18px; }

  .site-title { font-size: 26px; }
  .home-intro { font-size: 18px; }
  .section-title { font-size: 22px; }
  .essay-list a,
  .contact-list a,
  .essays-empty { font-size: 18px; }

  .essay-title { font-size: 42px; }
  .essay-subtitle { font-size: 22px; }
  .essay-date { font-size: 18px; }
  .essay-body { font-size: 18px; }
  .essay-body h2 { font-size: 1.45em; }
  .essay-body h3 { font-size: 1.15em; }

  .section { margin-top: var(--space-5); }
  .utility { margin-top: var(--space-6); }

  .header-inner {
    padding: 16px 20px 12px 20px;
  }
  .header-inner .site-title {
    font-size: 26px;
  }

  .essay-page .header-inner {
    max-width: none;
    padding: 8px 20px;
    display: grid;
    grid-template-columns: 44px minmax(0, 1fr) 44px;
    align-items: center;
  }

  .essay-page .header-actions {
    display: contents;
  }

  .essay-page .menu-btn {
    position: static;
    grid-column: 1;
    grid-row: 1;
    justify-self: start;
  }

  .essay-page .site-title {
    grid-column: 2;
    grid-row: 1;
    justify-self: center;
    text-align: center;
  }

  .essay-page .theme-toggle {
    grid-column: 3;
    grid-row: 1;
    justify-self: end;
  }

  .site {
    padding: 12px 20px 64px;
  }

  .contents {
    width: 86vw;
    padding: 96px 24px 32px 24px;
  }
  .contents h3 { font-size: 18px; }
  .contents-list a { font-size: 16px; }

  .essay-footer p { font-size: 18px; }

  .essay {
    padding-top: var(--space-3);
  }

}

/* ---------- Footnotes & Tooltips ---------- */
.footnote-ref {
  position: relative;
  display: inline-block;
  cursor: pointer;
  background-color: var(--footnote-bg);
  padding: 0 0.3em;
  margin-left: 0.1em;
  border-radius: 3px;
  font-size: 0.7em;
  vertical-align: super;
  line-height: 0;
  font-family: var(--serif);
  scroll-margin-top: 130px;
}
.footnote-ref a {
  text-decoration: none;
  color: inherit;
}
.footnote-ref a:hover {
  color: inherit;
  text-decoration: none;
}

.footnote-tooltip {
  display: block;
  position: absolute;
  bottom: 140%;
  left: 50%;
  transform: translateX(-50%) translateY(6px);
  width: 300px;
  max-width: 80vw;
  padding: 12px 16px;
  background-color: var(--footnote-tooltip-bg);
  color: var(--footnote-tooltip-fg);
  border: 1px solid var(--footnote-tooltip-border);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
  border-radius: 6px;
  font-size: 15px;
  line-height: 1.4;
  font-family: var(--serif);
  font-weight: 400;
  text-align: left;
  opacity: 0;
  pointer-events: none;
  z-index: 200;
  transition: opacity 0.2s cubic-bezier(0.4, 0, 0.2, 1), transform 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.footnote-tooltip::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border-width: 6px;
  border-style: solid;
  border-color: var(--footnote-tooltip-bg) transparent transparent transparent;
}
.footnote-tooltip::before {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border-width: 7px;
  border-style: solid;
  border-color: var(--footnote-tooltip-border) transparent transparent transparent;
  z-index: -1;
}

.footnote-ref:hover .footnote-tooltip {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

@media (max-width: 640px) {
  .footnote-tooltip {
    display: none;
  }
}

/* ---------- Custom Bullet Lists ---------- */
.bullet-list {
  list-style: none;
  margin: 0 0 1em 0;
  padding-left: 0.7em;
}
.bullet-list li,
.bullet-list_item {
  margin: 0 0 0.5em 0;
}
.bullet-list li::before,
.bullet-list_item::before {
  content: "\2022";
  font-size: 1em;
  margin-right: 0.35em;
  margin-left: -0.7em;
  display: inline-block;
  color: var(--fg);
}

/* ---------- Essay Footnotes Section ---------- */
.essay-footnotes {
  margin-top: var(--space-6);
  border-top: 1px solid var(--rule);
  padding-top: var(--space-4);
  font-size: 16px;
  color: var(--muted-strong);
}
.footnotes-list {
  padding-left: var(--space-3);
  margin: 0;
}
.footnotes-list li {
  margin-bottom: var(--space-2);
  line-height: 1.5;
  scroll-margin-top: 130px;
}
.footnote-backref {
  margin-left: 0.4em;
  text-decoration: none;
  font-family: sans-serif;
  color: var(--muted);
  font-size: 0.9em;
}
.footnote-backref:hover {
  color: var(--fg);
}

/* Reduce motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition: none !important;
    animation: none !important;
  }
}