/* ============================================================
   Sarthak Bhatnagar — Transportation & Industrial Design Portfolio
   Token system
   Color   — near-black graphite base, warm bone text, single
             beacon-amber accent (aviation ground-light reference,
             not a neon/vermilion default)
   Type    — Big Shoulders Display (headline), Space Grotesk (body),
             JetBrains Mono (technical / caption labels)
   Motif   — small pulsing beacon dot in place of numbered markers;
             thin horizontal "runway" rules
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Big+Shoulders+Display:wght@600;700;800&family=Space+Grotesk:wght@400;500;600&family=JetBrains+Mono:wght@400;500&display=swap');

:root{
  --bg:            #0c0d0e;
  --bg-raised:     #15171a;
  --bg-raised-2:   #1c1f22;
  --line:          #2a2d31;
  --line-soft:     #202226;
  --text:          #f1efe7;
  --text-dim:      #a5a8ac;
  --text-faint:    #6c6f73;
  --beacon:        #d9a441;
  --beacon-dim:    #7a6430;

  --display: 'Big Shoulders Display', sans-serif;
  --body:    'Space Grotesk', sans-serif;
  --mono:    'JetBrains Mono', monospace;

  --wrap: 1180px;
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
body{
  margin:0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img{ max-width:100%; display:block; }
a{ color: inherit; text-decoration:none; }

::selection{ background: var(--beacon); color: #0c0d0e; }

/* ---------- layout helpers ---------- */
.wrap{
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 40px;
}
@media (max-width: 640px){
  .wrap{ padding: 0 20px; }
}

.rule{
  height:1px;
  background: var(--line);
  border:0;
  margin:0;
}

/* ---------- beacon motif ---------- */
.beacon{
  width:7px; height:7px;
  border-radius:50%;
  background: var(--beacon);
  display:inline-block;
  flex-shrink:0;
  animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse{
  0%, 100%{ opacity:1; box-shadow: 0 0 0 0 rgba(217,164,65,0.35); }
  50%{ opacity:0.55; box-shadow: 0 0 0 6px rgba(217,164,65,0); }
}
@media (prefers-reduced-motion: reduce){
  .beacon{ animation: none; }
}

/* ---------- nav ---------- */
.site-nav{
  position: fixed;
  top:0; left:0; right:0;
  z-index: 100;
  padding: 22px 40px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  background: linear-gradient(to bottom, rgba(12,13,14,0.85), transparent);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
@media (max-width: 640px){
  .site-nav{ padding: 18px 20px; }
}
.site-nav .brand{
  display:flex; align-items:center; gap:8px;
  font-weight:500;
  color: var(--text);
}
.site-nav .links{
  display:flex; gap:28px;
}
.site-nav .links a{
  color: var(--text-dim);
  padding-bottom:2px;
  border-bottom: 1px solid transparent;
  transition: color .2s ease, border-color .2s ease;
}
.site-nav .links a:hover,
.site-nav .links a[aria-current="page"]{
  color: var(--text);
  border-color: var(--beacon);
}

/* ---------- footer ---------- */
.site-footer{
  border-top: 1px solid var(--line);
  padding: 48px 0 40px;
  margin-top: 120px;
}
.site-footer .foot-row{
  display:flex;
  flex-wrap:wrap;
  gap: 24px;
  justify-content:space-between;
  align-items:flex-end;
}
.site-footer .foot-links{
  display:flex;
  gap:24px;
  font-family: var(--mono);
  font-size: 12px;
  text-transform:uppercase;
  letter-spacing: 0.06em;
}
.site-footer .foot-links a{
  color: var(--text-dim);
  border-bottom:1px solid transparent;
  padding-bottom:2px;
  transition: color .2s ease, border-color .2s ease;
}
.site-footer .foot-links a:hover{
  color: var(--beacon);
  border-color: var(--beacon);
}
.site-footer .foot-meta{
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-faint);
}

/* ---------- image / video placeholder ---------- */
.placeholder{
  position:relative;
  background:
    repeating-linear-gradient(135deg, var(--bg-raised-2) 0 2px, var(--bg-raised) 2px 22px);
  border: 1px dashed var(--line);
  display:flex;
  align-items:center;
  justify-content:center;
  color: var(--text-faint);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  text-align:center;
  text-transform: uppercase;
  overflow:hidden;
}
.placeholder span{
  padding: 8px 14px;
  background: rgba(12,13,14,0.6);
  border: 1px solid var(--line);
  border-radius: 3px;
}

/* ---------- buttons / links-as-cta ---------- */
.cta{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family: var(--mono);
  font-size: 13px;
  text-transform:uppercase;
  letter-spacing:0.06em;
  color: var(--text);
  border-bottom: 1px solid var(--beacon);
  padding-bottom:4px;
  transition: gap .2s ease, color .2s ease;
}
.cta:hover{ gap:16px; color: var(--beacon); }

/* ---------- reveal-on-scroll ---------- */
.reveal{
  opacity:0;
  transform: translateY(18px);
  transition: opacity .7s ease, transform .7s ease;
}
.reveal.is-visible{
  opacity:1;
  transform:none;
}
@media (prefers-reduced-motion: reduce){
  .reveal{ opacity:1; transform:none; transition:none; }
}

/* ============================================================
   HOME — hero, intro strip, featured grid
   ============================================================ */
.hero{
  position: relative;
  height: 100svh;
  min-height: 560px;
  display:flex;
  flex-direction:column;
  justify-content:flex-end;
  overflow:hidden;
}
.hero-media{
  position:absolute;
  inset:0;
  z-index:0;
}
.hero-media img{
  width:100%;
  height:100%;
  object-fit: cover;
  object-position: center;
}
.hero-scrim{
  position:absolute;
  inset:0;
  z-index:1;
  background: linear-gradient(to top, rgba(12,13,14,0.95) 0%, rgba(12,13,14,0.35) 45%, rgba(12,13,14,0.15) 100%);
  pointer-events:none;
}
.hero-content{
  position:relative;
  z-index:2;
  padding-bottom: 72px;
}
.hero-eyebrow{
  display:flex; align-items:center; gap:10px;
  font-family: var(--mono);
  font-size:12px;
  text-transform:uppercase;
  letter-spacing:0.08em;
  color: var(--text-dim);
  margin: 0 0 18px;
}
.hero-title{
  font-family: var(--display);
  font-weight:800;
  font-size: clamp(56px, 12vw, 148px);
  line-height: 0.92;
  letter-spacing: 0.01em;
  margin: 0 0 18px;
  color: var(--text);
}
.hero-sub{
  font-family: var(--body);
  font-size: clamp(14px, 1.6vw, 18px);
  color: var(--text-dim);
  margin:0;
  max-width: 34ch;
}
.scroll-cue{
  position:absolute;
  z-index:2;
  right: 40px;
  bottom: 32px;
  display:flex;
  align-items:center;
  gap:10px;
  font-family: var(--mono);
  font-size:11px;
  text-transform:uppercase;
  letter-spacing:0.1em;
  color: var(--text-faint);
}
.scroll-cue .scroll-line{
  width:1px; height:36px;
  background: linear-gradient(to bottom, transparent, var(--beacon));
}
@media (max-width: 640px){
  .scroll-cue{ right:20px; bottom:20px; }
}

.intro{
  padding: 96px 0 64px;
}
.intro-lede{
  font-family: var(--body);
  font-size: clamp(20px, 2.6vw, 28px);
  font-weight:500;
  line-height:1.45;
  color: var(--text);
  max-width: 46ch;
  margin: 0 0 56px;
}
.intro-stats{
  display:flex;
  align-items:stretch;
  gap: 32px;
}
.stat{ flex:1; min-width:0; }
.stat-value{
  font-family: var(--display);
  font-weight:700;
  font-size: clamp(28px, 4vw, 40px);
  color: var(--beacon);
  margin:0 0 6px;
}
.stat-label{
  font-family: var(--mono);
  font-size:12px;
  color: var(--text-dim);
  margin:0;
  line-height:1.5;
}
.stat-rule{ width:1px; height:auto; align-self:stretch; }
@media (max-width: 720px){
  .intro-stats{ flex-direction:column; gap:24px; }
  .stat-rule{ width:100%; height:1px; }
}

.featured{ padding: 72px 0 40px; }
.featured-head{
  display:flex;
  align-items:center;
  justify-content:space-between;
  margin-bottom: 40px;
}
.featured-head h2{
  font-family: var(--display);
  font-weight:700;
  font-size: 34px;
  margin:0;
}
.featured-grid{
  display:grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}
.feat-card{ display:block; }
.feat-img{
  aspect-ratio: 4 / 3;
  margin-bottom:16px;
  width:100%;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: 3px;
}
.feat-title{
  font-family: var(--display);
  font-weight:700;
  font-size:22px;
  margin: 0 0 4px;
}
.feat-meta{
  font-family: var(--mono);
  font-size:12px;
  color: var(--text-dim);
  margin:0;
}
@media (max-width: 720px){
  .featured-grid{ grid-template-columns: 1fr; }
}