/* ==========================================================================
   Sumit Tamgale: Personal Site Stylesheet
   Pure HTML + CSS (Zero JS). Warm paper, high-contrast ink, simple layout.
   ========================================================================== */

:root {
  --bg-paper: #faf9f5;
  --bg-subtle: #f3f1ea;
  --bg-card: #ffffff;

  --ink-primary: #141413;
  --ink-secondary: #333330;
  --ink-muted: #6e6d68;

  --border-subtle: #e5e3db;
  --border-strong: #c9c6bc;
  --link-underline: #b8b4a8;

  --font-serif: 'Newsreader', Georgia, Cambria, 'Times New Roman', serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  --max-width: 680px;
}

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

html {
  font-size: 16px;
}

[id] {
  scroll-margin-top: 1.5rem;
}

body {
  font-family: var(--font-sans);
  color: var(--ink-primary);
  background-color: var(--bg-paper);
  margin: 0;
  line-height: 1.68;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection {
  background-color: #e4dfd3;
  color: var(--ink-primary);
}

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

/* ─── Container ─── */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ─── Header & Masthead ─── */
.site-header {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2.25rem 1.5rem 1.25rem;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--border-subtle);
}

.brand-title {
  margin: 0;
  font-size: inherit;
  font-weight: inherit;
  line-height: inherit;
  display: inline;
}

.brand-link {
  font-family: var(--font-serif);
  font-size: 1.375rem;
  font-weight: 500;
  letter-spacing: -0.015em;
  color: var(--ink-primary);
}

.site-nav {
  display: flex;
  align-items: baseline;
  gap: 1.5rem;
}

.nav-link {
  font-size: 0.875rem;
  color: var(--ink-muted);
  transition: color 0.15s ease;
}

.nav-link:hover {
  color: var(--ink-primary);
}

/* ─── Inline Prose Links ─── */
.prose-link {
  color: var(--ink-primary);
  text-decoration: underline;
  text-decoration-color: var(--link-underline);
  text-underline-offset: 3px;
  transition: text-decoration-color 0.15s ease;
}

.prose-link:hover {
  text-decoration-color: var(--ink-primary);
}


/* ─── Opening Narrative Bio ─── */
.intro-section {
  padding: 2.5rem 0 2.25rem;
  border-bottom: 1px solid var(--border-subtle);
}

.intro-prose {
  font-size: 1.025rem;
  line-height: 1.75;
  color: var(--ink-secondary);
  margin: 0 0 1.15rem;
}

.intro-prose:last-of-type {
  margin-bottom: 0;
}

.intro-prose strong {
  color: var(--ink-primary);
  font-weight: 600;
}

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

.contact-email {
  -webkit-user-select: all;
  user-select: all;
}

.social-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
}

/* ─── Sections ─── */
.section-block {
  padding: 2.25rem 0;
  border-bottom: 1px solid var(--border-subtle);
}

.section-block:last-of-type {
  border-bottom: none;
}

.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  gap: 1rem;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 1.3125rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--ink-primary);
  margin: 0;
}

/* ─── Simple Chronological Lists (Writing & Work) ─── */
.entry-list {
  display: flex;
  flex-direction: column;
  gap: 1.35rem;
}

.entry-row {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 1rem;
  align-items: baseline;
}

.entry-date {
  font-family: var(--font-mono);
  font-size: 0.78125rem;
  color: var(--ink-muted);
}

.entry-main h3,
.entry-main h4 {
  font-size: 0.96875rem;
  font-weight: 600;
  color: var(--ink-primary);
  margin: 0 0 0.25rem;
  line-height: 1.4;
}

.entry-main h3 a,
.entry-main h4 a {
  text-decoration: underline;
  text-decoration-color: var(--border-strong);
  text-underline-offset: 3px;
}

.entry-main h3 a:hover,
.entry-main h4 a:hover {
  text-decoration-color: var(--ink-primary);
}

.entry-main p {
  font-size: 0.9rem;
  line-height: 1.62;
  color: var(--ink-secondary);
  margin: 0;
}

.entry-main .entry-meta {
  font-size: 0.8125rem;
  color: var(--ink-muted);
  margin: 0 0 0.5rem;
}

.competition-results {
  display: flex;
  flex-wrap: wrap;
  gap: 0.15rem 1.25rem;
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.62;
}

.competition-results > div {
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
}

.competition-results dt {
  font-weight: 600;
  color: var(--ink-secondary);
}

.competition-results dd {
  margin: 0;
  color: var(--ink-muted);
}

/* ─── Experience ─── */
.experience-details {
  margin-top: 2.25rem;
}

.subsection-title {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--ink-primary);
  margin: 0 0 1rem;
}

.org-block {
  margin-bottom: 2.5rem;
}

.org-block:last-child {
  margin-bottom: 0;
}

.org-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.org-name {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--ink-primary);
  margin: 0;
}

.org-loc {
  font-family: var(--font-sans);
  font-size: 0.84375rem;
  color: var(--ink-muted);
  font-weight: 400;
}

.role-list {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.role-item {
  padding-left: 1rem;
  border-left: 1.5px solid var(--border-subtle);
}

.role-item.current {
  border-left-color: var(--ink-primary);
}

.role-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 0.35rem;
}

.role-title {
  font-size: 0.96875rem;
  font-weight: 600;
  color: var(--ink-primary);
  margin: 0;
}

.role-date {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-muted);
}

.role-bullets {
  margin: 0.4rem 0 0;
  padding-left: 1.15rem;
  font-size: 0.90625rem;
  line-height: 1.68;
  color: var(--ink-secondary);
}

.role-note {
  margin: 0.25rem 0 0.5rem;
  font-size: 0.84375rem;
  color: var(--ink-muted);
}

.role-bullets li {
  margin-bottom: 0.35rem;
}

.role-bullets li:last-child {
  margin-bottom: 0;
}

/* ─── Essay Article Page ─── */
.essay-article {
  padding: 2.5rem 0 3.5rem;
}

.essay-header {
  padding-bottom: 1.75rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border-subtle);
}

.back-link {
  font-size: 0.8125rem;
  color: var(--ink-muted);
  display: inline-block;
  margin-bottom: 1.25rem;
}

.back-link:hover {
  color: var(--ink-primary);
}

.essay-headline {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--ink-primary);
  margin: 0 0 0.75rem;
}

.essay-subtitle {
  font-size: 1rem;
  line-height: 1.62;
  color: var(--ink-secondary);
  margin: 0 0 1.25rem;
}

.essay-meta-line {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-muted);
}

.essay-body {
  font-size: 1rem;
  line-height: 1.76;
  color: var(--ink-secondary);
}

.essay-body h2 {
  font-family: var(--font-serif);
  font-size: 1.375rem;
  font-weight: 500;
  color: var(--ink-primary);
  margin: 2.25rem 0 0.75rem;
  line-height: 1.3;
}

.essay-body h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink-primary);
  margin: 1.75rem 0 0.5rem;
}

.essay-body p {
  margin: 0 0 1.15rem;
}

.essay-body strong {
  color: var(--ink-primary);
  font-weight: 600;
}

.essay-body ul,
.essay-body ol {
  margin: 0 0 1.25rem;
  padding-left: 1.25rem;
}

.essay-body li {
  margin-bottom: 0.45rem;
}

.essay-body blockquote {
  margin: 1.5rem 0;
  padding: 0.15rem 0 0.15rem 1.15rem;
  border-left: 2px solid var(--border-strong);
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.08rem;
  color: var(--ink-primary);
}

.essay-body code {
  font-family: var(--font-mono);
  font-size: 0.84em;
  background-color: var(--bg-subtle);
  padding: 0.12rem 0.32rem;
  border-radius: 3px;
}

.diagram-figure {
  margin: 2rem 0;
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  padding: 1.25rem;
}

.diagram-caption {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--ink-muted);
  margin-top: 0.75rem;
  line-height: 1.5;
}

.math-display {
  margin: 1.5rem 0;
  padding: 0.875rem 1rem;
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  overflow-x: auto;
  font-size: 0.925rem;
}

.essay-footnotes {
  margin-top: 2.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.8125rem;
  color: var(--ink-muted);
}

.essay-footnotes h4 {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 0 0 0.6rem;
}

.essay-footnotes ol {
  margin: 0;
  padding-left: 1.2rem;
  line-height: 1.6;
}

.bibtex-section {
  margin-top: 2rem;
  padding: 1rem 1.25rem;
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
}

.bibtex-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--ink-muted);
  display: block;
  margin-bottom: 0.5rem;
}

.bibtex-pre {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.55;
  color: var(--ink-secondary);
  overflow-x: auto;
  white-space: pre;
}

/* ─── Footer ─── */
.site-footer {
  max-width: var(--max-width);
  margin: 1.5rem auto 0;
  padding: 1.75rem 1.5rem 2.5rem;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.8125rem;
  color: var(--ink-muted);
}

.footer-links {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.footer-links a:hover {
  color: var(--ink-primary);
}

/* ─── Mobile ─── */
@media (max-width: 640px) {
  .site-header {
    padding-top: 1.5rem;
  }

  .entry-row {
    grid-template-columns: 1fr;
    gap: 0.2rem;
  }

  .org-header,
  .role-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.1rem;
  }

  .essay-headline {
    font-size: 1.65rem;
  }
}