/* ============================================================
   sanganivarun.me — shared design system
   Warm paper, classic serif, no loud accent. Text-first.
   ============================================================ */

/* Newsreader variable — normal, weights 400–600 */
@font-face {
  font-family: 'Newsreader';
  font-style: normal;
  font-weight: 400 600;
  font-display: swap;
  src: url('fonts/newsreader-normal-latin-ext.woff2') format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: 'Newsreader';
  font-style: normal;
  font-weight: 400 600;
  font-display: swap;
  src: url('fonts/newsreader-normal-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

/* Newsreader variable — italic, weights 400–500 */
@font-face {
  font-family: 'Newsreader';
  font-style: italic;
  font-weight: 400 500;
  font-display: swap;
  src: url('fonts/newsreader-italic-latin-ext.woff2') format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: 'Newsreader';
  font-style: italic;
  font-weight: 400 500;
  font-display: swap;
  src: url('fonts/newsreader-italic-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

/* IBM Plex Mono 400 */
@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('fonts/ibm-plex-mono-400-latin-ext.woff2') format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('fonts/ibm-plex-mono-400-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

/* IBM Plex Mono 500 */
@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('fonts/ibm-plex-mono-500-latin-ext.woff2') format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('fonts/ibm-plex-mono-500-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

:root {
  /* --- Color: warm paper + warm near-black ink --- */
  --paper:      oklch(0.994 0.001 95);   /* page background, porcelain near-white */
  --paper-2:    oklch(0.978 0.001 95);   /* cards / insets */
  --paper-3:    oklch(0.965 0.001 95);   /* hover wells */
  --ink:        oklch(0.275 0.012 60);   /* primary text */
  --ink-soft:   oklch(0.415 0.012 60);   /* secondary text */
  --grey:       oklch(0.555 0.010 70);   /* meta, muted */
  --grey-2:     oklch(0.660 0.008 70);   /* faint meta */
  --rule:       oklch(0.890 0.002 95);   /* hairlines */
  --rule-soft:  oklch(0.930 0.001 95);   /* fainter hairlines */

  /* --- Type --- */
  --serif: "Newsreader", Georgia, "Times New Roman", serif;
  --mono:  "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;

  /* --- Measure / rhythm --- */
  --measure: 40rem;       /* reading column ~ 640px */
  --measure-wide: 54rem;  /* index / projects */
  --pad: clamp(1.25rem, 4vw, 2rem);
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 19px;
  line-height: 1.65;
  font-weight: 400;
  font-optical-sizing: auto;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  font-feature-settings: "kern" 1, "liga" 1;
}

/* ---------- Layout shell ---------- */
.wrap {
  width: 100%;
  max-width: var(--measure);
  margin: 0 auto;
  padding: 0 var(--pad);
}
.wrap--wide { max-width: var(--measure-wide); }

main { padding-bottom: 6rem; }

/* ---------- Links ---------- */
a { color: inherit; }
.prose a,
a.link {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--rule);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: text-decoration-color .15s ease, color .15s ease;
}
.prose a:hover,
a.link:hover {
  text-decoration-color: var(--ink);
}

/* ---------- Header / nav ---------- */
.site-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 2.4rem 0 1.6rem;
  flex-wrap: wrap;
}
.brand {
  font-family: var(--serif);
  font-size: 1.12rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  text-decoration: none;
  color: var(--ink);
  white-space: nowrap;
}
.brand:hover { color: var(--ink-soft); }

.nav {
  display: flex;
  align-items: baseline;
  gap: 1.4rem;
}
.nav a {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--grey);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: color .15s ease, border-color .15s ease;
}
.nav a:hover { color: var(--ink); }
.nav a[aria-current="page"] {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

/* ---------- Footer ---------- */
.site-foot {
  margin-top: 5rem;
  padding: 2rem 0 3.5rem;
  border-top: 1px solid var(--ink);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem 1.5rem;
  flex-wrap: wrap;
}
.foot-links { display: flex; gap: 1.25rem; flex-wrap: wrap; }
.foot-links a {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.03em;
  color: var(--ink);
  text-decoration: none;
  transition: opacity .15s ease;
}
.foot-links a:hover { opacity: 0.6; }
.foot-note {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink);
  letter-spacing: 0.01em;
}

/* ---------- Meta / mono accents ---------- */
.mono {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.02em;
  color: var(--grey);
}
.eyebrow {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--grey-2);
}

/* ---------- Headings & prose ---------- */
h1, h2, h3 { font-weight: 500; letter-spacing: -0.012em; color: var(--ink); }

.page-title {
  font-size: clamp(1rem, 2.5vw, 1.35rem);
  line-height: 1.08;
  margin: 0.4rem 0 0.6rem;
  font-weight: 500;
  letter-spacing: -0.02em;
}
.lede {
  font-size: 1.12rem;
  color: var(--ink-soft);
  line-height: 1.6;
  margin: 0 0 1.4rem;
}
.lede em { font-style: italic; }

.prose { font-size: 1.06rem; line-height: 1.72; }
.prose p { margin: 0 0 1.3rem; }
.prose h2 {
  font-size: 1.065rem;
  margin: 2.6rem 0 0.8rem;
  line-height: 1.2;
}
.prose h3 {
  font-size: 1.12rem;
  margin: 2rem 0 0.5rem;
  font-weight: 600;
}
.prose ul, .prose ol { margin: 0 0 1.3rem; padding-left: 1.2rem; }
.prose li { margin: 0.3rem 0; padding-left: 0.2rem; }
.prose blockquote {
  margin: 1.6rem 0;
  padding: 0.2rem 0 0.2rem 1.3rem;
  border-left: 2px solid var(--rule);
  color: var(--ink-soft);
  font-style: italic;
}
.prose code {
  font-family: var(--mono);
  font-size: 0.82em;
  background: var(--paper-2);
  border: 1px solid var(--rule-soft);
  border-radius: 4px;
  padding: 0.1em 0.36em;
}
.prose pre {
  font-family: var(--mono);
  font-size: 0.8rem;
  line-height: 1.6;
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 1rem 1.1rem;
  overflow-x: auto;
  margin: 1.4rem 0;
  color: var(--ink-soft);
}
.prose pre code { background: none; border: none; padding: 0; font-size: inherit; }
.prose hr {
  border: none;
  border-top: 1px solid var(--rule);
  margin: 2.4rem 0;
}
.prose strong { font-weight: 600; }

/* drop-cap-free, but a calm first-line touch on posts */
.prose--post > p:first-of-type { color: var(--ink); }

/* ---------- Post list (home + blog index) ---------- */
.postlist { list-style: none; margin: 0; padding: 0; }
.postlist li { margin: 0; }
.post-row {
  display: grid;
  grid-template-columns: 6.5rem 1fr;
  gap: 0.2rem 1.4rem;
  align-items: baseline;
  padding: 1.05rem 0;
  border-top: 1px solid var(--rule-soft);
  text-decoration: none;
  color: var(--ink);
}
.postlist li:last-child .post-row { border-bottom: 1px solid var(--rule-soft); }
.post-row:hover .post-row__title { text-decoration-color: var(--ink); }
.post-row__date {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.02em;
  color: var(--grey-2);
  padding-top: 0.35rem;
  white-space: nowrap;
}
.post-row__title {
  font-size: 1.12rem;
  line-height: 1.35;
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
  transition: text-decoration-color .15s ease;
}
.post-row__desc {
  grid-column: 2;
  color: var(--ink-soft);
  font-size: 0.98rem;
  line-height: 1.5;
  margin-top: 0.15rem;
}
.post-row__tags {
  grid-column: 2;
  margin-top: 0.45rem;
  display: flex; gap: 0.5rem; flex-wrap: wrap;
}
.tag {
  font-family: var(--mono);
  font-size: 0.64rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--grey);
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 0.1rem 0.5rem;
}

@media (max-width: 540px) {
  .post-row { grid-template-columns: 1fr; gap: 0.1rem; }
  .post-row__date { padding-top: 0; }
  .post-row__desc, .post-row__tags { grid-column: 1; }
}

/* ---------- Notebook index (title left, date right, no tags in list) ---------- */
.nb-head {
  font-size: 0.88rem;
  font-weight: 500;
  letter-spacing: 0;
  color: var(--ink);
  margin: 0.2rem 0 1.4rem;
}
.nb-list { list-style: none; margin: 0; padding: 0; }
.nb-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding: 0.55rem 0;
  text-decoration: none;
  color: var(--ink);
}
.nb-row__title {
  font-size: 0.88rem;
  line-height: 1.4;
  font-weight: 400;
  flex: 1;
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
  transition: text-decoration-color .15s ease;
}
.nb-row:hover .nb-row__title { text-decoration-color: var(--ink); }
.nb-row__date {
  font-family: var(--mono);
  font-size: 0.79rem;
  letter-spacing: 0;
  color: var(--ink);
  white-space: nowrap;
  flex-shrink: 0;
}

@media (max-width: 480px) {
  .nb-row { flex-direction: column; gap: 0.1rem; }
  .nb-row__date { color: var(--grey); }
}

/* ---------- Section label ---------- */
.section-label {
  display: flex; align-items: baseline; justify-content: space-between;
  margin: 2.6rem 0 0.4rem;
}
.section-label h2 {
  font-size: 0.82rem;
  font-family: var(--mono);
  font-weight: 400;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--grey);
}
.section-label a {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--grey-2);
  text-decoration: none;
}
.section-label a:hover { color: var(--ink); }

/* ---------- Projects: 2-up card tiles ---------- */
.proj-group { margin-top: 2rem; }
.proj-group__label {
  display: flex; align-items: baseline; gap: 0.6rem;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--grey);
  margin-bottom: 0.7rem;
}
.proj-group__label .count { color: var(--grey-2); letter-spacing: 0.02em; }

.proj-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.9rem;
}
@media (max-width: 540px) { .proj-grid { grid-template-columns: 1fr; } }

.proj-tile {
  position: relative;
  overflow: hidden;
  min-height: 220px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  border: 1px solid var(--rule-soft);
  border-radius: 14px;
  text-decoration: none;
  color: var(--ink);
  transition: border-color .18s ease, transform .18s ease, box-shadow .18s ease;
}
.proj-tile:hover {
  border-color: var(--rule);
  transform: translateY(-2px);
  box-shadow: 0 6px 24px oklch(0.2 0.01 60 / 0.07);
}

/* full-bleed background image */
.proj-bg {
  position: absolute;
  inset: 0;
  display: block;
}
.proj-bg image-slot {
  display: block;
  width: 100%;
  height: 100%;
}

/* gradient overlay — fades from paper at bottom to transparent above */
.proj-tile::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to top,
    var(--paper) 0%,
    oklch(0.994 0.001 95 / 0.85) 38%,
    oklch(0.994 0.001 95 / 0.1) 100%);
  pointer-events: none;
}

/* text content sits above the overlay */
.proj-content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 1.1rem 1.2rem 1.2rem;
}

.proj-name { font-size: 1.04rem; font-weight: 500; letter-spacing: -0.01em; }
.proj-desc { color: var(--ink-soft); font-size: 0.9rem; line-height: 1.46; }
.proj-cat {
  font-family: var(--mono);
  font-size: 0.64rem;
  letter-spacing: 0.03em;
  color: var(--grey-2);
  white-space: nowrap;
  margin-top: 0.1rem;
}

/* ---------- Intro / hero block ---------- */
.intro { padding: 1.4rem 0 0.5rem; }
.intro h1 {
  font-size: clamp(1.35rem, 2.6vw, 1.62rem);
  line-height: 1.32;
  font-weight: 500;
  letter-spacing: -0.011em;
  margin: 0 0 0.85rem;
  max-width: 34rem;
}
.intro p {
  font-size: 1.08rem;
  color: var(--ink-soft);
  line-height: 1.68;
  margin: 0 0 1.15rem;
  max-width: 37rem;
}
.intro .sig {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--grey);
  margin-top: 0.4rem;
}

/* ---------- Misc ---------- */
.back-link {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--grey);
  text-decoration: none;
  display: inline-flex; gap: 0.4rem; align-items: center;
}
.back-link:hover { color: var(--ink); }

.post-head { margin: 0.5rem 0 2rem; }
.post-head .page-title { margin-top: 0.7rem; }
.post-meta {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--grey);
  letter-spacing: 0.02em;
  display: flex; gap: 1rem; flex-wrap: wrap; align-items: center;
  margin-top: 0.6rem;
}

.callout {
  border-left: 2px solid var(--rule);
  padding: 0.1rem 0 0.1rem 1.3rem;
  margin: 1.8rem 0;
}
.callout .eyebrow { margin-bottom: 0.3rem; }
.callout p { margin: 0; color: var(--ink-soft); font-size: 1rem; font-style: italic; }

::selection { background: oklch(0.92 0.004 95); }

/* ---------- Figures (diagrams in posts) ---------- */
.prose figure {
  margin: 2rem 0;
  padding: 1.2rem;
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-radius: 8px;
}
.prose figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 4px;
}
.prose figcaption {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.02em;
  color: var(--grey);
  margin-top: 0.7rem;
  text-align: center;
}

/* ---------- Back-of-envelope table ---------- */
.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  margin: 1.4rem 0;
}
.prose th {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--grey);
  font-weight: 400;
  text-align: left;
  padding: 0.4rem 0.8rem 0.4rem 0;
  border-bottom: 1px solid var(--rule);
}
.prose td {
  padding: 0.45rem 0.8rem 0.45rem 0;
  border-bottom: 1px solid var(--rule-soft);
  vertical-align: top;
  line-height: 1.5;
}
.prose td:last-child, .prose th:last-child { padding-right: 0; }