/* ============================================================
   Kaustubh Mahajan — Portfolio
   Design system: "Ledger" — true black, white/grey ink.
   Numbers set in tabular mono to read like verified statement
   entries, not decoration. (--teal/--brass names kept for a
   smaller diff — both are grey accents now, not literal colors.)
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:ital,opsz,wght@0,9..144,400;0,9..144,500;1,9..144,400;1,9..144,500&family=IBM+Plex+Sans:wght@400;500;600&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root {
  --bg: #000000;
  --bg-raised: #131313;
  --paper: #ffffff;
  --paper-dim: #c6c6c6;
  --muted: #8a8a8a;
  --line: #262626;
  --line-strong: #3c3c3c;
  --teal: #e6e6e6;
  --brass: #9a9a9a;
  --accent-pop: #8ec9ff;

  --font-display: 'Fraunces', Georgia, serif;
  --font-body: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'IBM Plex Mono', 'SF Mono', Menlo, monospace;

  --container: 1240px;
  --gutter: 40px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--paper);
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Pins the footer to the viewport bottom on short pages (e.g. Contact) —
   on longer pages this has no effect, content just pushes it down as usual. */
footer {
  margin-top: auto;
}

a {
  color: var(--paper);
  text-decoration: none;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--brass);
  outline-offset: 3px;
}

.wrap {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

@media (max-width: 560px) {
  .wrap { padding: 0 24px; }
}

/* ---------- Nav ---------- */

.site-nav {
  border-bottom: 1px solid var(--line);
  padding: 22px 0;
}

.site-nav .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.wordmark {
  font-family: var(--font-display);
  font-size: 23px;
  letter-spacing: 0.01em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav-links a {
  color: var(--paper-dim);
  font-weight: 500;
  transition: color 0.2s ease;
  padding: 2px 0;
  border-bottom: 1px solid transparent;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--paper);
  border-bottom-color: var(--teal);
}

/* ---------- Hero ---------- */

.hero {
  padding: 88px 0 56px;
}

/* Used on inner pages (About, Work, Side Projects, Contact) where the hero
   is just an eyebrow + title with no photo — the full 88px top padding
   leaves too much dead air under the nav bar. */
.hero-compact {
  padding-top: 20px;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--teal);
  margin: 0 0 20px;
}

.hero h1 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(34px, 5.4vw, 54px);
  line-height: 1.12;
  margin: 0 0 28px;
}

.hero .lede {
  font-size: 18px;
  color: var(--paper-dim);
  max-width: 54ch;
  margin: 0 0 8px;
}

.hero-top {
  display: flex;
  gap: 40px;
  align-items: flex-start;
  margin: 8px 0 0;
}

.hero-photo-col {
  flex: 0 0 38%;
}

.hero-photo {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  border-radius: 4px;
  filter: grayscale(12%);
  border: 1px solid var(--line-strong);
  display: block;
}

.hero-text-col {
  flex: 1;
  min-width: 0;
  padding-top: 8px;
}

@media (max-width: 640px) {
  .hero-top { flex-direction: column; gap: 24px; }

  .hero-photo-col {
    flex: none;
    width: 100%;
  }

  .hero-photo {
    aspect-ratio: 4 / 5;
  }

  .hero-text-col { padding-top: 0; }
}

.icon-row {
  display: flex;
  gap: 12px;
  margin-top: 22px;
}

.icon-link {
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  color: var(--paper-dim);
  transition: color 0.2s ease, border-color 0.2s ease;
}

.icon-link:hover {
  color: var(--paper);
  border-color: var(--teal);
}

.icon-link svg {
  width: 18px;
  height: 18px;
}

/* ---------- Ledger rows (signature element) ---------- */

.ledger {
  margin: 48px 0 0;
}

.ledger-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.ledger-row .label {
  font-family: var(--font-body);
  font-size: 15px;
  color: var(--paper-dim);
  max-width: 62%;
}

.ledger-row .value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 15px;
  font-weight: 500;
  color: var(--paper);
  white-space: nowrap;
  letter-spacing: 0.01em;
}

.ledger-row .value .unit {
  color: var(--muted);
  font-size: 12px;
  margin-left: 4px;
}

.ledger-caption {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.06em;
  margin: 14px 0 0;
}

/* ---------- Sections / prose ---------- */

section {
  padding: 56px 0;
  border-bottom: 1px solid var(--line);
}

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

.section-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 28px;
}

.section-num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--teal);
}

/* ---------- Timeline ---------- */

.timeline {
  position: relative;
  padding-left: 32px;
}

.timeline-item {
  position: relative;
  padding-bottom: 40px;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-item:not(:last-child)::before {
  content: '';
  position: absolute;
  left: -28px;
  top: 9px;
  bottom: -9px;
  width: 1px;
  background: var(--line-strong);
}

.timeline-marker {
  position: absolute;
  left: -32px;
  top: 4px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--teal);
  z-index: 1;
}

h2 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 26px;
  margin: 0;
}

h3 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 21px;
  margin: 0 0 10px;
}

.mk-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 10px;
  font-style: normal;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent-pop);
  background: var(--bg-raised);
  border: 1px solid var(--line-strong);
  padding: 3px 8px;
  border-radius: 3px;
  vertical-align: middle;
  margin-left: 10px;
}

p { color: var(--paper-dim); margin: 0 0 16px; max-width: 65ch; }

.meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 6px;
}

.timeline .meta,
.eyebrow-pop {
  color: var(--accent-pop);
}

/* ---------- Case study blocks ---------- */

.case {
  padding: 40px 0;
  border-bottom: 1px solid var(--line);
}

.case:last-child { border-bottom: none; }

.case .meta {
  color: var(--accent-pop);
}

.case-stat {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent-pop);
  background: var(--bg-raised);
  border: 1px solid var(--line-strong);
  padding: 6px 12px;
  border-radius: 3px;
  margin: 4px 8px 4px 0;
}

/* ---------- Endorsements ---------- */

.endorsement {
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}

.endorsement:last-child { border-bottom: none; }

.endorsement-quote {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 19px;
  color: var(--paper);
  line-height: 1.55;
  margin: 0 0 12px;
  max-width: 56ch;
}

.endorsement-attr {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.04em;
  position: relative;
  padding-left: 16px;
  margin: 0;
}

.endorsement-attr::before {
  content: '';
  position: absolute;
  left: 0;
  top: 6px;
  width: 8px;
  height: 2px;
  background: var(--brass);
}

.endorsements-head {
  text-align: center;
  margin-bottom: 36px;
}

.script-heading {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 400;
  font-size: clamp(28px, 4vw, 38px);
  margin: 0 0 10px;
}

.squiggle {
  display: block;
  width: 130px;
  height: 14px;
  color: var(--brass);
}

.endorsements-head .squiggle {
  margin: 0 auto;
}

.section-title {
  text-align: center;
  margin-bottom: 32px;
}

.section-title .script-heading {
  font-style: normal;
  font-weight: 600;
  font-size: clamp(32px, 5vw, 46px);
}

.endorsements-section .endorsement {
  text-align: center;
  border-bottom: none;
  padding: 16px 0;
  max-width: 56ch;
  margin: 0 auto;
}

.endorsements-section .endorsement-quote {
  margin-left: auto;
  margin-right: auto;
}

.endorsements-section .endorsement-attr {
  padding-left: 0;
  display: block;
}

.endorsements-section .endorsement-attr::before {
  display: none;
}

/* ---------- CTA / links ---------- */

.textlink {
  border-bottom: 1px solid var(--teal);
  padding-bottom: 1px;
  transition: opacity 0.2s ease;
}

.textlink:hover { opacity: 0.75; }

.cta-row {
  margin-top: 12px;
}

/* ---------- Footer ---------- */

footer {
  padding: 12px 0 19px;
}

.footer-links {
  display: flex;
  gap: 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  flex-wrap: wrap;
}

.footer-links a { color: var(--muted); }
.footer-links a:hover { color: var(--paper); }

.footer-note {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--line-strong);
  margin-top: 10px;
}

/* ---------- Scroll reveal (subtle, respects reduced motion) ---------- */

.reveal {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

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