/* ============================================================
   VIKASH KUMAR DANGI — PORTFOLIO
   Design tokens
   Color:
     --bg:        #0A0F1C  (deep space navy)
     --bg-2:      #0D1526
     --blue:      #4C8DFF  (network signal blue)
     --teal:      #2DD4BF  (uptime teal)
     --violet:    #8B5CF6  (secondary glow)
     --gold:      #D4AF37  (UAE accent, used sparingly)
     --ink:       #F3F6FB  (primary text)
     --ink-dim:   #97A3B8  (secondary text)
   Type:
     Display: 'Sora'            -> headings, big numbers
     Body:    'Inter'           -> paragraphs, UI
     Mono:    'JetBrains Mono'  -> tags, dates, labels (network/terminal feel)
   Signature: animated node/network canvas behind hero + glass panels
   ============================================================ */

:root{
  --bg: #090D18;
  --bg-2: #0D1526;
  --blue: #4C8DFF;
  --teal: #2DD4BF;
  --violet: #8B5CF6;
  --gold: #D4AF37;
  --ink: #F3F6FB;
  --ink-dim: #97A3B8;
  --ink-dimmer: #66728A;

  --glass-fill: rgba(255,255,255,0.055);
  --glass-fill-strong: rgba(255,255,255,0.09);
  --glass-border: rgba(255,255,255,0.14);
  --glass-shadow: rgba(3, 6, 15, 0.55);

  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-sm: 12px;

  --maxw: 1180px;
  --pad: clamp(20px, 5vw, 64px);

  --ease: cubic-bezier(.22,.9,.28,1);
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }

body{
  margin:0;
  background: var(--bg);
  color: var(--ink);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  position: relative;
}

h1,h2,h3{
  font-family: 'Sora', 'Inter', sans-serif;
  margin: 0;
  letter-spacing: -0.02em;
  color: var(--ink);
}

a{ color: inherit; text-decoration: none; }
ul{ margin:0; padding:0; list-style:none; }
p{ margin: 0 0 0.9em; color: var(--ink-dim); }
p:last-child{ margin-bottom: 0; }

img,svg{ display:block; max-width:100%; }

::selection{ background: var(--blue); color: #fff; }

/* ---------- background atmosphere ---------- */

#net-canvas{
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  opacity: 0.55;
  pointer-events: none;
}

.mesh-glow{
  position: fixed;
  border-radius: 50%;
  filter: blur(110px);
  z-index: 0;
  pointer-events: none;
  opacity: 0.35;
  will-change: transform;
}
.mesh-glow--one{
  width: 620px; height: 620px;
  top: -180px; left: -160px;
  background: radial-gradient(circle, var(--blue), transparent 70%);
}
.mesh-glow--two{
  width: 560px; height: 560px;
  top: 30vh; right: -220px;
  background: radial-gradient(circle, var(--violet), transparent 70%);
}
.mesh-glow--three{
  width: 640px; height: 640px;
  bottom: -260px; left: 10vw;
  background: radial-gradient(circle, var(--teal), transparent 70%);
  opacity: 0.22;
}

.grain{
  position: fixed;
  inset:0;
  z-index: 1;
  pointer-events:none;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---------- glass primitive ---------- */

.glass{
  background: var(--glass-fill);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(22px) saturate(140%);
  -webkit-backdrop-filter: blur(22px) saturate(140%);
  box-shadow: 0 8px 32px var(--glass-shadow), inset 0 1px 0 rgba(255,255,255,0.06);
}

.panel{
  border-radius: var(--radius-lg);
  padding: clamp(24px, 3.5vw, 40px);
  position: relative;
  z-index: 2;
}

/* ---------- nav ---------- */

.nav-wrap{
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  justify-content: center;
  padding: 18px var(--pad) 0;
  pointer-events: none;
}

.nav{
  width: 100%;
  max-width: var(--maxw);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 14px 12px 22px;
  border-radius: 100px;
  pointer-events: all;
  transition: background 0.4s var(--ease), border-color .4s var(--ease), box-shadow .4s var(--ease);
}

.nav__logo{
  font-family: 'Sora', sans-serif;
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: 0.02em;
}
.nav__logo span{ color: var(--teal); }

.nav__links{
  display: flex;
  gap: 6px;
  align-items:center;
}

.nav__link{
  font-size: 0.88rem;
  color: var(--ink-dim);
  padding: 8px 14px;
  border-radius: 100px;
  transition: color .25s var(--ease), background .25s var(--ease);
  position: relative;
}
.nav__link:hover, .nav__link.active{
  color: var(--ink);
  background: rgba(255,255,255,0.06);
}

.nav__cta{ font-size: 0.85rem; padding: 9px 20px; white-space:nowrap; }

.nav__toggle{
  display:none;
  flex-direction:column;
  justify-content:center;
  gap:5px;
  width: 38px; height: 38px;
  background: rgba(255,255,255,0.06);
  border:1px solid var(--glass-border);
  border-radius: 50%;
  cursor:pointer;
}
.nav__toggle span{
  display:block;
  width: 15px; height: 1.5px;
  background: var(--ink);
  margin: 0 auto;
  transition: transform .3s var(--ease), opacity .3s var(--ease);
}

/* ---------- buttons ---------- */

.btn{
  display: inline-flex;
  align-items: center;
  justify-content:center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: 100px;
  font-size: 0.92rem;
  font-weight: 500;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), background .3s var(--ease), border-color .3s var(--ease);
  border: 1px solid transparent;
  cursor:pointer;
}
.btn--primary{
  background: linear-gradient(135deg, var(--blue), var(--violet));
  color: #fff;
  box-shadow: 0 8px 24px rgba(76,141,255,0.28);
}
.btn--primary:hover{ transform: translateY(-2px); box-shadow: 0 14px 32px rgba(76,141,255,0.4); }

.btn--ghost{
  background: rgba(255,255,255,0.05);
  border-color: var(--glass-border);
  color: var(--ink);
}
.btn--ghost:hover{
  background: rgba(255,255,255,0.1);
  transform: translateY(-2px);
}

/* ---------- hero ---------- */

.hero{
  position: relative;
  z-index: 2;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 140px var(--pad) 80px;
}

.hero__inner{ max-width: 900px; }

.eyebrow{
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--teal);
  margin: 0 0 20px;
  display:flex;
  align-items:center;
  justify-content:center;
  gap: 8px;
}
.dot{
  width: 6px; height:6px;
  border-radius:50%;
  background: var(--teal);
  box-shadow: 0 0 0 0 rgba(45,212,191,0.6);
  animation: pulse 2s infinite;
}
@keyframes pulse{
  0%{ box-shadow: 0 0 0 0 rgba(45,212,191,0.5); }
  70%{ box-shadow: 0 0 0 10px rgba(45,212,191,0); }
  100%{ box-shadow: 0 0 0 0 rgba(45,212,191,0); }
}

.hero__title{
  font-size: clamp(2.6rem, 8vw, 5.2rem);
  font-weight: 700;
  line-height: 1.02;
  margin-bottom: 22px;
}
.hero__title-accent{
  background: linear-gradient(120deg, var(--blue), var(--teal) 60%, var(--violet));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero__role{
  display:flex;
  flex-wrap:wrap;
  gap: 10px;
  justify-content:center;
  margin-bottom: 26px;
}

.tag-mono{
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  padding: 7px 14px;
  border-radius: 100px;
  background: rgba(255,255,255,0.055);
  border: 1px solid var(--glass-border);
  color: var(--ink-dim);
  white-space: nowrap;
}

.hero__desc{
  max-width: 620px;
  margin: 0 auto 36px;
  font-size: 1.02rem;
  color: var(--ink-dim);
}

.hero__actions{
  display:flex;
  gap: 14px;
  justify-content:center;
  flex-wrap: wrap;
  margin-bottom: 60px;
}

.hero__stats{
  display:flex;
  gap: 16px;
  justify-content:center;
  flex-wrap: wrap;
}

.stat{
  border-radius: var(--radius-md);
  padding: 20px 26px;
  min-width: 168px;
  text-align:left;
}
.stat__num{
  font-family:'Sora', sans-serif;
  font-size: 2rem;
  font-weight: 700;
  color: var(--ink);
}
.stat__suffix{
  font-family:'Sora', sans-serif;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--teal);
}
.stat__label{
  display:block;
  font-size: 0.78rem;
  color: var(--ink-dimmer);
  margin-top: 4px;
}

.scroll-cue{
  position:absolute;
  bottom: 34px;
  left: 50%;
  transform: translateX(-50%);
  display:flex;
  flex-direction:column;
  align-items:center;
  gap: 8px;
  opacity: 0.6;
}
.scroll-cue span{
  width: 1px;
  height: 34px;
  background: linear-gradient(var(--ink), transparent);
  animation: scrollDown 1.8s infinite var(--ease);
}
.scroll-cue p{
  font-family:'JetBrains Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-dimmer);
  margin:0;
}
@keyframes scrollDown{
  0%{ transform: scaleY(0); transform-origin: top; opacity: 0; }
  40%{ transform: scaleY(1); transform-origin: top; opacity:1; }
  60%{ transform: scaleY(1); transform-origin: bottom; opacity:1; }
  100%{ transform: scaleY(0); transform-origin: bottom; opacity:0; }
}

/* ---------- sections (shared) ---------- */

.section{
  position: relative;
  z-index: 2;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 120px var(--pad) 20px;
}

.section__head{
  margin-bottom: 48px;
  max-width: 640px;
}
.section__head h2{
  font-size: clamp(1.7rem, 3.4vw, 2.5rem);
  margin-top: 10px;
}
.section .eyebrow{ justify-content:flex-start; margin-bottom: 0; }

/* ---------- about ---------- */

.about__grid{
  display:grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 22px;
}
.about__card p{ font-size: 1.02rem; }
.about__card strong{ color: var(--ink); font-weight: 600; }

.about__meta{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px solid var(--glass-border);
}
.about__meta div{ display:flex; flex-direction:column; gap: 4px; }
.about__meta span{
  font-family:'JetBrains Mono', monospace;
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-dimmer);
}
.about__meta strong{ font-size: 0.95rem; font-weight: 500; color: var(--ink); }
.about__meta a:hover{ color: var(--teal); }

.about__side{
  display:flex;
  flex-direction:column;
  gap: 22px;
}
.side-card{ flex:1; display:flex; flex-direction:column; gap: 10px; }
.side-card__icon{
  width: 42px; height:42px;
  display:flex; align-items:center; justify-content:center;
  border-radius: 12px;
  background: rgba(76,141,255,0.12);
  color: var(--blue);
}
.side-card__icon svg{ width: 22px; height:22px; }
.side-card h3{ font-size: 1.05rem; }
.side-card p{ font-size: 0.9rem; }

/* ---------- skills ---------- */

.skills__grid{
  display:grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
}

.skill-tile{
  border-radius: var(--radius-md);
  padding: 22px;
  display:flex;
  flex-direction:column;
  gap: 14px;
  transition: transform .35s var(--ease), border-color .35s var(--ease), background .35s var(--ease);
  cursor: default;
}
.skill-tile:hover{
  transform: translateY(-6px);
  border-color: rgba(76,141,255,0.4);
  background: var(--glass-fill-strong);
}
.skill-tile__icon{
  width: 38px; height: 38px;
  border-radius: 10px;
  display:flex; align-items:center; justify-content:center;
  background: rgba(45,212,191,0.12);
  color: var(--teal);
}
.skill-tile__icon svg{ width: 20px; height: 20px; }
.skill-tile h4{
  font-family:'Sora', sans-serif;
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--ink);
  margin: 0;
}
.skill-tile p{ font-size: 0.82rem; margin:0; }

/* ---------- timeline ---------- */

.timeline{ position: relative; }
.timeline__line{
  position:absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(var(--blue), var(--teal), transparent);
  opacity: 0.5;
}
.timeline__item{
  position: relative;
  padding-left: 42px;
  margin-bottom: 26px;
}
.timeline__item:last-child{ margin-bottom: 0; }
.timeline__dot{
  position:absolute;
  left: 0; top: 26px;
  width: 15px; height:15px;
  border-radius:50%;
  background: var(--bg);
  border: 2px solid var(--teal);
  box-shadow: 0 0 0 4px rgba(45,212,191,0.12);
}
.timeline__top{
  display:flex;
  justify-content:space-between;
  align-items:baseline;
  flex-wrap:wrap;
  gap: 10px;
  margin-bottom: 4px;
}
.timeline__top h3{ font-size: 1.2rem; }
.timeline__dates{ color: var(--teal); }
.timeline__org{
  font-size: 0.9rem;
  color: var(--ink-dimmer);
  margin-bottom: 16px;
}
.timeline__card ul{ display:flex; flex-direction:column; gap: 9px; }
.timeline__card li{
  position: relative;
  padding-left: 18px;
  font-size: 0.92rem;
  color: var(--ink-dim);
}
.timeline__card li::before{
  content:'';
  position:absolute;
  left:0; top: 9px;
  width: 6px; height: 1.5px;
  background: var(--blue);
}

/* ---------- education ---------- */

.edu__grid{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
}
.edu__card h3{
  font-size: 1.1rem;
  margin-bottom: 22px;
  color: var(--teal);
  font-family:'JetBrains Mono', monospace;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 0.85rem;
}
.edu__row{
  padding-bottom: 18px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--glass-border);
  display:flex;
  flex-direction:column;
  gap: 6px;
}
.edu__row:last-child{ border-bottom:none; margin-bottom:0; padding-bottom:0; }
.edu__row strong{ font-size: 0.98rem; color: var(--ink); font-weight: 600; }
.edu__row .tag-mono{ align-self:flex-start; padding: 4px 10px; font-size: 0.7rem; }
.edu__row p{ font-size: 0.86rem; margin: 2px 0 0; }

/* ---------- contact ---------- */

.section--contact{ padding-top: 60px; padding-bottom: 60px; }
.contact__card{
  text-align:center;
  max-width: 760px;
  margin: 0 auto;
  padding: clamp(40px, 6vw, 64px);
}
.contact__card h2{
  font-size: clamp(1.6rem, 3.6vw, 2.3rem);
  margin: 10px 0 16px;
}
.contact__desc{
  max-width: 480px;
  margin: 0 auto 32px;
}
.contact__actions{
  display:flex;
  gap: 14px;
  justify-content:center;
  flex-wrap:wrap;
}

/* ---------- footer ---------- */

.footer{
  position: relative;
  z-index: 2;
  text-align:center;
  padding: 40px var(--pad) 50px;
}
.footer p{
  font-family:'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--ink-dimmer);
}

/* ---------- reveal animation ---------- */

.reveal{
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .8s var(--ease), transform .8s var(--ease);
}
.reveal.is-visible{
  opacity: 1;
  transform: translateY(0);
}
.hero .reveal:nth-child(1){ transition-delay: .05s; }
.hero .reveal:nth-child(2){ transition-delay: .15s; }
.hero .reveal:nth-child(3){ transition-delay: .25s; }
.hero .reveal:nth-child(4){ transition-delay: .35s; }
.hero .reveal:nth-child(5){ transition-delay: .45s; }
.hero .reveal:nth-child(6){ transition-delay: .55s; }

/* ---------- responsive ---------- */

@media (max-width: 860px){
  .about__grid{ grid-template-columns: 1fr; }
  .edu__grid{ grid-template-columns: 1fr; }
  .about__meta{ grid-template-columns: 1fr 1fr; }
}

@media (max-width: 720px){
  .nav__links{
    position: fixed;
    top: 82px;
    left: var(--pad);
    right: var(--pad);
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 14px;
    border-radius: 22px;
    background: rgba(10,14,26,0.92);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    transform-origin: top;
    transform: scaleY(0);
    opacity: 0;
    pointer-events: none;
    transition: transform .3s var(--ease), opacity .3s var(--ease);
  }
  .nav__links.is-open{
    transform: scaleY(1);
    opacity: 1;
    pointer-events: all;
  }
  .nav__link{ padding: 12px 16px; text-align:left; }
  .nav__toggle{ display:flex; }
  .nav__cta{ display:none; }

  .hero{ padding-top: 120px; }
  .hero__stats{ flex-direction: column; align-items: stretch; }
  .stat{ width: 100%; }
}

@media (max-width: 480px){
  .about__meta{ grid-template-columns: 1fr; }
  .timeline__top{ flex-direction: column; align-items: flex-start; }
  .hero .eyebrow{ flex-direction: column; gap: 4px; }
  .hero .eyebrow .dot{ display: none; }
}

/* ---------- reduced motion ---------- */

@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior: auto; }
  .reveal{ transition: none; opacity: 1; transform: none; }
  .dot, .scroll-cue span{ animation: none; }
  * { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}

/* ---------- focus visibility ---------- */

a:focus-visible, button:focus-visible{
  outline: 2px solid var(--teal);
  outline-offset: 3px;
  border-radius: 8px;
}