/* =========================================================
   Dheerendra Tomar — Portfolio
   Shares the "Engineering Blueprint" design system with
   primelab.site: warm paper, ink, vermilion accent, Fraunces,
   blueprint grid, hard offset shadows. One brand family.
   ========================================================= */

:root {
  --paper:      #f4f1ea;   /* warm off-white */
  --paper-2:    #ebe7dd;   /* slightly deeper panel */
  --ink:        #161412;   /* near-black */
  --ink-soft:   #44403a;   /* muted body */
  --line:       #cfc8b8;   /* hairline rules */
  --accent:     #c73c1b;   /* vermilion (WCAG AA on paper) */
  --accent-ink: #b6320f;
  --paper-dark: #161412;
  --paper-dark-soft: #2a2620;

  --font-display: "Fraunces", Georgia, "Times New Roman", serif;
  --font-body: ui-monospace, "SF Mono", "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;

  --maxw: 1120px;
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --radius: 2px;
}

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

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

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: clamp(1rem, 0.95rem + 0.2vw, 1.0625rem);
  line-height: 1.65;
  color: var(--ink);
  background-color: var(--paper);
  background-image:
    linear-gradient(to right, rgba(22,20,18,0.045) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(22,20,18,0.045) 1px, transparent 1px);
  background-size: 34px 34px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; display: block; }
a { color: inherit; }

/* ---------- Layout helpers ---------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
section { position: relative; }

/* ---------- Skip link / focus ---------- */
.skip-link {
  position: absolute;
  left: 0; top: -3em;
  background: var(--ink);
  color: var(--paper);
  padding: 0.6em 1em;
  z-index: 100;
  text-decoration: none;
  transition: top 0.15s ease;
}
.skip-link:focus { top: 0; }

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

/* ---------- Header / nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: var(--maxw);
  margin-inline: auto;
  padding: 0.85rem var(--gutter);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  font-weight: 600;
}
.brand-mark {
  width: 0.85rem;
  height: 0.85rem;
  background: var(--accent);
  transform: rotate(45deg);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 22%, transparent);
}
.brand-name {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 900;
  letter-spacing: 0.02em;
}
.nav-menu {
  list-style: none;
  display: flex;
  align-items: center;
  gap: clamp(1rem, 3vw, 2.25rem);
  margin: 0;
  padding: 0;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.nav-menu a { text-decoration: none; padding: 0.4rem 0; position: relative; }
.nav-menu a:not(.nav-cta)::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 100%; height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.2s ease;
}
.nav-menu a:not(.nav-cta):hover::after,
.nav-menu a:not(.nav-cta):focus-visible::after { transform: scaleX(1); }
.nav-cta {
  border: 1px solid var(--ink);
  transition: background 0.18s ease, color 0.18s ease;
}
.nav-menu .nav-cta { padding: 0.5rem 1rem; }
.nav-cta:hover, .nav-cta:focus-visible { background: var(--ink); color: var(--paper); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 44px; height: 44px;
  align-items: center;
  justify-content: center;
  background: none;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  cursor: pointer;
}
.nav-toggle-bar {
  display: block;
  width: 22px; height: 2px;
  background: var(--ink);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 0.85rem 1.5rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: transform 0.15s ease, background 0.18s ease, color 0.18s ease, box-shadow 0.18s ease;
}
.btn:active { transform: translateY(1px); }
.btn-lg { padding: 1.05rem 2rem; font-size: 0.9rem; }

.btn-primary {
  background: var(--accent);
  color: var(--paper);
  box-shadow: 4px 4px 0 var(--ink);
}
.btn-primary:hover, .btn-primary:focus-visible {
  background: var(--accent-ink);
  box-shadow: 2px 2px 0 var(--ink);
  transform: translate(2px, 2px);
}
.btn-ghost { color: var(--ink); border-color: var(--line); }
.btn-ghost:hover, .btn-ghost:focus-visible { border-color: var(--ink); background: var(--paper-2); }

/* ---------- Eyebrow / section labels ---------- */
.eyebrow, .section-index {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--accent-ink);
  margin: 0 0 1rem;
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
}
.tick { width: 8px; height: 8px; background: var(--accent); display: inline-block; }
.section-index { color: var(--ink-soft); }

.section-head { margin-bottom: clamp(2rem, 5vw, 3.5rem); }
.section-head h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 1.4rem + 3vw, 3.5rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  margin: 0;
}

/* ---------- Hero ---------- */
.hero { padding: clamp(4rem, 9vw, 8rem) 0 clamp(3rem, 6vw, 5rem); }
.hero-inner { max-width: 64rem; }
.hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(3rem, 1.6rem + 7vw, 6.5rem);
  line-height: 0.96;
  letter-spacing: -0.03em;
  margin: 0 0 1.5rem;
}
.hero h1 .accent {
  color: var(--accent);
  font-style: italic;
  font-weight: 500;
}
.hero-sub {
  max-width: 44rem;
  font-size: clamp(1.05rem, 1rem + 0.4vw, 1.3rem);
  color: var(--ink-soft);
  margin: 0 0 2.25rem;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: clamp(2.5rem, 6vw, 4rem);
}
.hero-meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  border: 1px solid var(--line);
  background: var(--line);
}
.hero-meta > div {
  background: color-mix(in srgb, var(--paper) 80%, white);
  padding: 1.1rem 1.25rem;
}
.hero-meta dt {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--ink-soft);
  margin-bottom: 0.3rem;
}
.hero-meta dd {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
}

/* ---------- About ---------- */
.about {
  padding: clamp(3.5rem, 7vw, 6rem) 0;
  border-top: 1px solid var(--line);
}
.about-inner {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}
.about .section-head { margin-bottom: 0; }
.about-body p {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.2rem, 1rem + 0.9vw, 1.7rem);
  line-height: 1.4;
  margin: 0 0 1.5rem;
}
.about-body p:last-child { margin-bottom: 0; }

/* ---------- Tech Stack ---------- */
.stack { padding: clamp(3.5rem, 7vw, 6rem) 0; border-top: 1px solid var(--line); }
.cluster-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.cluster {
  position: relative;
  background: color-mix(in srgb, var(--paper) 75%, white);
  padding: clamp(1.5rem, 3vw, 2.25rem);
  overflow: hidden;
  transition: background 0.2s ease;
}
.cluster::before {
  content: "";
  position: absolute;
  inset: 0;
  border-top: 3px solid var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}
.cluster:hover { background: #fff; }
.cluster:hover::before { transform: scaleX(1); }
.cluster-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.25rem;
  letter-spacing: -0.01em;
  margin: 0 0 1rem;
}
.tag-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.tag {
  font-size: 0.78rem;
  letter-spacing: 0.03em;
  padding: 0.3rem 0.65rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  color: var(--ink-soft);
}

/* ---------- Professional Journey ---------- */
.journey { padding: clamp(3.5rem, 7vw, 6rem) 0; border-top: 1px solid var(--line); }
.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.timeline-item {
  background: color-mix(in srgb, var(--paper) 80%, white);
  padding: clamp(1.5rem, 3vw, 2.5rem);
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: clamp(1.25rem, 3vw, 3rem);
  position: relative;
  border-left: 3px solid transparent;
  transition: border-color 0.2s ease, background 0.2s ease;
}
.timeline-item:hover { background: #fff; border-left-color: var(--accent); }
.role-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.35rem;
  letter-spacing: -0.01em;
  margin: 0 0 0.4rem;
}
.role-org { margin: 0 0 0.35rem; font-weight: 600; color: var(--ink); }
.role-dates {
  margin: 0;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-ink);
}
.role-points { margin: 0; padding-left: 1.1rem; color: var(--ink-soft); }
.role-points li { margin-bottom: 0.45rem; }
.role-points li:last-child { margin-bottom: 0; }

/* ---------- Featured Projects ---------- */
.projects { padding: clamp(3.5rem, 7vw, 6rem) 0; border-top: 1px solid var(--line); }
.project-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.project {
  position: relative;
  background: color-mix(in srgb, var(--paper) 75%, white);
  padding: clamp(1.75rem, 3vw, 2.5rem);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: background 0.2s ease;
}
.project::before {
  content: "";
  position: absolute;
  inset: 0;
  border-top: 3px solid var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}
.project:hover { background: #fff; }
.project:hover::before { transform: scaleX(1); }
.project-num { font-size: 0.8rem; color: var(--accent-ink); letter-spacing: 0.05em; }
.project-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.4rem;
  line-height: 1.1;
  letter-spacing: -0.01em;
  margin: 0.6rem 0 0.75rem;
}
.project-blurb { margin: 0 0 1.25rem; color: var(--ink-soft); font-size: 0.92rem; }
.project .tag-list { margin-bottom: 1.5rem; }
.project-link {
  margin-top: auto;
  align-self: flex-start;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink);
  border-bottom: 2px solid var(--accent);
  padding-bottom: 2px;
  transition: color 0.18s ease;
}
.project-link span { transition: margin-left 0.18s ease; display: inline-block; }
.project-link:hover, .project-link:focus-visible { color: var(--accent-ink); }
.project-link:hover span, .project-link:focus-visible span { margin-left: 0.25rem; }

/* ---------- Contact (inverted block) ---------- */
.contact {
  background: var(--paper-dark);
  color: var(--paper);
  padding: clamp(4rem, 9vw, 7rem) 0;
  border-top: 1px solid var(--line);
  background-image:
    linear-gradient(to right, rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 34px 34px;
}
.contact .section-index { color: #b9b09c; }
.contact-inner { max-width: 50rem; }
.contact h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.2rem, 1.4rem + 4vw, 4.25rem);
  line-height: 1.0;
  letter-spacing: -0.025em;
  margin: 0 0 1.25rem;
}
.contact-lede {
  color: #d9d3c6;
  font-size: clamp(1.05rem, 1rem + 0.4vw, 1.25rem);
  max-width: 34rem;
  margin: 0 0 2.5rem;
}
.contact-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}
.contact .btn-primary { box-shadow: 4px 4px 0 var(--accent-ink); }
.contact .btn-primary:hover, .contact .btn-primary:focus-visible { box-shadow: 2px 2px 0 var(--accent-ink); }
.contact-email { margin: 0; color: #b9b09c; font-size: 0.95rem; }
.contact-email a {
  color: var(--paper);
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-underline-offset: 3px;
}
.contact-email a:hover { text-decoration-thickness: 2px; }
.social-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 1px;
  border: 1px solid var(--paper-dark-soft);
  background: var(--paper-dark-soft);
}
.social-list li { flex: 1 1 8rem; }
.social-list a {
  display: block;
  background: var(--paper-dark);
  padding: 1rem 1.25rem;
  text-decoration: none;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--paper);
  transition: background 0.18s ease, color 0.18s ease;
}
.social-list a:hover, .social-list a:focus-visible { background: var(--accent); color: var(--paper); }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--paper-dark-soft);
  color: var(--paper);
  padding: 1.75rem 0;
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
}
.footer-brand { margin: 0; }
.footer-email { margin: 0; }
.footer-email a { color: #cfc8b8; text-decoration: none; }
.footer-email a:hover, .footer-email a:focus-visible {
  color: var(--paper);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- Entrance animation ---------- */
@media (prefers-reduced-motion: no-preference) {
  .hero .eyebrow, .hero h1, .hero-sub, .hero-actions, .hero-meta {
    opacity: 0;
    transform: translateY(14px);
    animation: rise 0.7s cubic-bezier(0.2, 0.7, 0.2, 1) forwards;
  }
  .hero h1 { animation-delay: 0.06s; }
  .hero-sub { animation-delay: 0.14s; }
  .hero-actions { animation-delay: 0.22s; }
  .hero-meta { animation-delay: 0.30s; }
}
@keyframes rise {
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .about-inner { grid-template-columns: 1fr; }
  .cluster-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .timeline-item { grid-template-columns: 1fr; gap: 1rem; }
}

@media (max-width: 680px) {
  .nav-toggle { display: inline-flex; }
  .nav-menu {
    position: absolute;
    left: 0; right: 0; top: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    padding: 0.5rem var(--gutter) 1rem;
    display: none;
  }
  .nav-menu.is-open { display: flex; }
  .nav-menu li { border-top: 1px solid var(--line); }
  .nav-menu a { display: block; padding: 0.9rem 0; }
  .nav-cta { text-align: center; margin-top: 0.75rem; }

  .cluster-grid { grid-template-columns: 1fr; }
  .project-grid { grid-template-columns: 1fr; }
  .hero-meta { grid-template-columns: 1fr; }
  .hero-actions .btn, .contact-actions .btn { width: 100%; }
}