/* ============================================================
   Navin Kumar — portfolio
   Editorial layout: warm paper, serif display, sans body.
   ============================================================ */

/* ---------- tokens ---------- */
:root {
  --bg:            #fffcf5;
  --bg-raised:     #fffefb;
  --bg-sunken:     #faf6ec;
  --text:          #1a1a1a;
  --text-muted:    #5f5c56;
  --text-faint:    #726e65;   /* 5.0:1 on --bg — small caps labels must stay AA */
  --border:        #e6e2d8;
  --border-strong: #d5d0c2;
  --accent:        #b5451b;
  --accent-soft:   #fbe9e0;
  --nav-track:     #e5e3df;   /* grey track; the active chip is --bg on top of it */

  --font-serif: "Playfair Display", Georgia, "Times New Roman", serif;
  --font-sans:  "Sora", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono:  "JetBrains Mono", "SF Mono", Monaco, Consolas, "Courier New", monospace;

  --max-width: 960px;
  --radius:    14px;
  --shadow-sm: 0 1px 2px rgba(26, 22, 12, .04);
  --shadow-md: 0 6px 22px rgba(26, 22, 12, .07);
  --shadow-lg: 0 14px 40px rgba(26, 22, 12, .10);
  --ease: cubic-bezier(.22, .61, .36, 1);
}

[data-theme="dark"] {
  --bg:            #12110e;
  --bg-raised:     #1a1815;
  --bg-sunken:     #100f0c;
  --text:          #f2efe8;
  --text-muted:    #a8a49a;
  --text-faint:    #918c81;   /* 5.5:1 on dark --bg */
  --border:        #2a2823;
  --border-strong: #3a372f;
  --accent:        #ef8a5e;
  --accent-soft:   #2c1c14;
  --nav-track:     #26241f;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, .3);
  --shadow-md: 0 6px 22px rgba(0, 0, 0, .4);
  --shadow-lg: 0 14px 40px rgba(0, 0, 0, .5);
}

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

html { scroll-behavior: smooth; scroll-padding-top: 7rem; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background-color .3s var(--ease), color .3s var(--ease);
}

h1, h2, h3 { margin: 0; line-height: 1.2; font-weight: 600; }
p { margin: 0 0 1.1em; }
a { color: inherit; }
code {
  font-family: var(--font-mono);
  font-size: .86em;
  background: var(--bg-sunken);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: .1em .4em;
}
em { font-style: italic; }
strong { font-weight: 600; color: var(--text); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 1rem;
  z-index: 200;
  background: var(--text);
  color: var(--bg);
  padding: .6rem 1rem;
  border-radius: 8px;
  text-decoration: none;
}
.skip-link:focus { left: 1rem; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

/* ============================================================
   nav
   ============================================================ */
.pill-nav-wrapper {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 1.5rem 2rem;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.pill-nav {
  display: flex;
  align-items: center;
  gap: .15rem;
  padding: .3rem;
  background: var(--nav-track);
  border-radius: 999px;
}

.pill-nav-item {
  display: flex;
  align-items: center;
  gap: .45rem;
  padding: .5rem 1rem;
  border-radius: 999px;
  font-size: .94rem;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  white-space: nowrap;
  transition: background-color .2s var(--ease), color .2s var(--ease);
}
.pill-nav-item:hover { color: var(--text); }
/* the active chip is the page colour lifted off the grey track */
.pill-nav-item.is-active {
  color: var(--text);
  background: var(--bg);
  box-shadow: 0 1px 3px rgba(0, 0, 0, .08);
}

/* outline icons — nav items and the theme toggle */
.pill-nav-item svg,
.theme-toggle svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex: none;
}

/* solid brand marks — socials are filled glyphs, not strokes */
.pill-nav-social svg.brand {
  width: 18px;
  height: 18px;
  fill: currentColor;
  stroke: none;
  flex: none;
}

.theme-toggle {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  padding: 0;
  background: none;
  color: var(--text-muted);
  border: 0;
  border-radius: 999px;
  cursor: pointer;
  transition: color .2s var(--ease), transform .2s var(--ease);
}
.theme-toggle:hover { color: var(--accent); transform: rotate(-18deg); }
.theme-toggle .icon-moon { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun  { display: none; }
[data-theme="dark"] .theme-toggle .icon-moon { display: block; }

.pill-nav-social { display: flex; gap: .35rem; }
.pill-nav-social a {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  color: var(--text-faint);
  border-radius: 999px;
  transition: color .2s var(--ease), background-color .2s var(--ease);
}
.pill-nav-social a:hover { color: var(--text); background: var(--bg-sunken); }

/* ============================================================
   hero
   ============================================================ */
/* 24px above the name, 48px below the tagline, matching the reference rhythm */
.hero { padding: 1.5rem 0 3rem; }

.hero-name {
  font-family: var(--font-serif);
  font-size: clamp(2.4rem, 6vw, 3rem);   /* tops out at his 48px */
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -.01em;
  margin-bottom: .75rem;
}

.hero-tagline {
  font-size: 1.25rem;
  font-weight: 400;
  line-height: 1.5;
  color: var(--text-muted);
  max-width: 46ch;
  margin: 0;
}

/* ============================================================
   section furniture
   ============================================================ */
section { padding: 3.5rem 0; }

.section-title {
  font-size: .875rem;          /* 14px, same as his */
  font-weight: 600;
  letter-spacing: .05em;
  text-transform: uppercase;
  color: var(--text);
  padding-bottom: .8rem;
  margin-bottom: 1.8rem;
  border-bottom: 1px solid var(--border);
}

.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.8rem;
}
.section-header .section-title { margin-bottom: 0; flex: 1; }

.section-link {
  font-size: .8rem;
  color: var(--text-muted);
  text-decoration: none;
  white-space: nowrap;
  transition: color .2s var(--ease);
}
.section-link:hover { color: var(--accent); }
.section-link span { display: inline-block; transition: transform .2s var(--ease); }
.section-link:hover span { transform: translateX(3px); }

/* ============================================================
   about + sticky rail
   ============================================================ */
.about-intro {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  gap: 3.5rem;
  align-items: start;
  padding-bottom: 2rem;
}

.lede {
  font-size: 1rem;
  color: var(--text);
  line-height: 1.7;
}
/* direct children only — otherwise this outranks .tl-org / .tl-body inside the timeline */
.about-intro-main > p { color: var(--text-muted); line-height: 1.7; }
.about-intro-main > .lede { color: var(--text); }

.about-rail {
  position: sticky;
  top: 7.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.rail-photo {
  display: grid;
  place-items: center;
  width: 100%;
  height: auto;          /* beat the width/height attrs so aspect-ratio wins */
  aspect-ratio: 4 / 5;
  object-fit: cover;
  background: linear-gradient(150deg, var(--bg-sunken), var(--accent-soft));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
}
.rail-photo span {
  font-family: var(--font-serif);
  font-size: 3.4rem;
  font-weight: 700;
  color: var(--text-faint);
  letter-spacing: .02em;
}

.rail-card {
  padding: 1.4rem;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}
.rail-card-title {
  font-family: var(--font-mono);
  font-size: .7rem;
  font-weight: 500;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: .9rem;
}
.rail-list {
  list-style: none;
  margin: 0 0 1.1rem;
  padding: 0;
  font-size: .9375rem;
  line-height: 1.55;
  color: var(--text-muted);
}
.rail-list li { position: relative; padding-left: 1.1rem; margin-bottom: .6rem; }
.rail-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
}
.rail-cta {
  font-size: .85rem;
  color: var(--accent);
  text-decoration: none;
  font-weight: 400;
}
.rail-cta span { display: inline-block; transition: transform .2s var(--ease); }
.rail-cta:hover span { transform: translateX(3px); }

/* ============================================================
   timeline
   ============================================================ */
.timeline { position: relative; padding-left: 1.6rem; }
.timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: .6rem;
  bottom: .6rem;
  width: 1px;
  background: var(--border);
}

.tl-item { position: relative; padding-bottom: 2.4rem; }
.tl-item::before {
  content: "";
  position: absolute;
  left: -1.6rem;
  top: .5rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--border-strong);
  transition: border-color .2s var(--ease), background-color .2s var(--ease);
}
.tl-item:first-child::before { border-color: var(--accent); background: var(--accent); }

.tl-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
.tl-role { font-size: 1rem; font-weight: 600; }
.tl-date {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .06em;
  color: var(--text-faint);
  white-space: nowrap;
}
.tl-org {
  font-size: .9375rem;
  color: var(--accent);
  margin: .15rem 0 .7rem;
}
.tl-body {
  font-size: .9375rem;
  line-height: 1.6;
  color: var(--text-muted);
  margin-bottom: .8rem;
}
.tl-tags { margin-top: .2rem; }

/* ============================================================
   grids + cards
   ============================================================ */
.grid { display: grid; gap: 1.25rem; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-tight { gap: 1rem; }

.card {
  display: flex;
  flex-direction: column;
  padding: 1.6rem;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), border-color .25s var(--ease);
}
.card:hover {
  transform: translateY(-3px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
}

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .75rem;
  margin-bottom: .9rem;
}
.card-kicker {
  font-family: var(--font-mono);
  font-size: .67rem;
  font-weight: 500;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--text-faint);
}

.badge {
  font-family: var(--font-mono);
  font-size: .62rem;
  font-weight: 500;
  letter-spacing: .08em;
  text-transform: uppercase;
  padding: .18rem .5rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--text-muted);
}
.badge-live {
  color: #1c8a5c;
  background: color-mix(in srgb, #22a06b 12%, transparent);
  border-color: color-mix(in srgb, #22a06b 28%, transparent);
}
[data-theme="dark"] .badge-live { color: #4dd39b; }

.card-title {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: .25rem;
}
.card-sub {
  font-size: .9375rem;
  color: var(--accent);
  margin-bottom: .8rem;
}
.card-body {
  font-size: .9375rem;        /* 15px, same as his */
  line-height: 1.55;
  color: var(--text-muted);
  margin-bottom: 1.1rem;
}
.card-meta {
  font-family: var(--font-mono);
  font-size: .67rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-top: auto;
}

.is-post .card-title { font-size: 1.12rem; }

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  list-style: none;
  margin: 0 0 1.1rem;
  padding: 0;
}
.tags li {
  font-family: var(--font-mono);
  font-size: .68rem;
  padding: .22rem .55rem;
  color: var(--text-muted);
  background: var(--bg-sunken);
  border: 1px solid var(--border);
  border-radius: 6px;
}

.card-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.1rem;
  margin-top: auto;
  padding-top: .3rem;
}
.card-links a {
  font-size: .83rem;
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid var(--border-strong);
  padding-bottom: 1px;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.card-links a:hover { color: var(--accent); border-color: var(--accent); }

/* ============================================================
   background — plain columns, no card chrome
   ============================================================ */
.bg-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  /* wider row gap than column gap: once this wraps to a second row, matching
     gaps make the two bands read as one long list */
  gap: 4rem 3rem;
}

.bg-col-title {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.3;
  color: var(--text);
  margin-bottom: .75rem;
}

.bg-list {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: .75rem;
}
.bg-list li {
  display: flex;
  align-items: flex-start;
  gap: .75rem;
  padding: .75rem;
  border-radius: .5rem;
  font-size: .875rem;
  line-height: 1.5;
  color: var(--text-muted);
}
.bg-list li::before {
  content: "\2713";
  flex-shrink: 0;
  color: #10b981;
  font-size: 1.25rem;
  line-height: 1;
}

/* credential links sit inline after the certificate name; keep them quiet
   until hovered so they don't compete with the text they belong to */
.bg-list a {
  color: var(--accent);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 1px solid transparent;
  transition: border-color .2s var(--ease);
}
.bg-list a::before {
  content: "\2197";
  margin-right: .2em;
  font-size: .85em;
}
.bg-list a:hover { border-bottom-color: var(--accent); }

/* ============================================================
   contact
   ============================================================ */
.contact {
  margin: 2rem 0 1rem;
  padding: 3.5rem 2.5rem;
  background: var(--bg-sunken);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-align: center;
}
.contact-title {
  font-family: var(--font-serif);
  font-size: clamp(1.7rem, 4vw, 2.4rem);
  font-weight: 600;
  letter-spacing: -.015em;
  margin-bottom: .8rem;
}
.contact-body {
  max-width: 46ch;
  margin: 0 auto 2rem;
  color: var(--text-muted);
  font-size: .96rem;
}
.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  justify-content: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .7rem 1.3rem;
  font-size: .87rem;
  font-family: var(--font-sans);
  text-decoration: none;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: var(--bg-raised);
  color: var(--text);
  transition: transform .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}
.btn:hover { transform: translateY(-2px); border-color: var(--text); }
.btn-primary {
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
  font-family: var(--font-mono);
  font-size: .82rem;
}
.btn-primary:hover { background: var(--accent); border-color: var(--accent); }

/* ============================================================
   footer
   ============================================================ */
.footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2.5rem 2rem 3.5rem;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: .5rem;
  font-size: .8rem;
  color: var(--text-faint);
}
.footer p { margin: 0; }

/* ============================================================
   scroll reveal
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .6s var(--ease), transform .6s var(--ease);
}
.reveal.is-visible { opacity: 1; transform: none; }

/* ============================================================
   responsive
   ============================================================ */
@media (max-width: 900px) {
  .about-intro { grid-template-columns: 1fr; gap: 2.5rem; }
  .about-rail {
    position: static;
    flex-direction: row;
    gap: 1.25rem;
  }
  .rail-photo { max-width: 220px; }
  .rail-card { flex: 1; }
  .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .bg-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 2.75rem 2rem; }
}

@media (max-width: 720px) {
  .container, .footer { padding-left: 1.25rem; padding-right: 1.25rem; }
  .pill-nav-wrapper {
    gap: .5rem;
    padding: .9rem 1rem;
    justify-content: space-between;
  }
  .pill-nav { overflow-x: auto; scrollbar-width: none; }
  .pill-nav::-webkit-scrollbar { display: none; }
  .pill-nav-item span { display: none; }
  .pill-nav-item { padding: .5rem .7rem; }
  .pill-nav-social { display: none; }

  .hero { padding: 1rem 0 2rem; }
  .about-rail { flex-direction: column; }
  .rail-photo { max-width: 100%; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .bg-grid { grid-template-columns: 1fr; gap: 1.5rem; }
  .contact { padding: 2.5rem 1.5rem; }
  section { padding: 2.5rem 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
  .reveal { opacity: 1; transform: none; }
}

/* print — the page doubles as a CV handout */
@media print {
  .pill-nav-wrapper, .theme-toggle, .rail-photo, .contact-actions { display: none; }
  body { background: #fff; color: #000; }
  .card, .bg-col { break-inside: avoid; box-shadow: none; }
  .reveal { opacity: 1; transform: none; }
}