/* ===========================================================
   NISHTHA KUKREJA — PORTFOLIO
   Design tokens: dark, dimensional, technical-but-warm
=========================================================== */

:root{
  /* base */
  --void: #08080f;
  --void-2: #0c0c17;
  --surface: #10101d;
  --surface-2: #14142a;
  --border-soft: rgba(255,255,255,0.08);
  --border-glow: rgba(155,107,255,0.35);

  /* text */
  --text-hi: #f3f2f9;
  --text-mid: #b7b4c9;
  --text-low: #7a7791;

  /* accents */
  --blue: #4f8dff;
  --cyan: #33e0c6;
  --purple: #9b6bff;
  --pink: #f14e9c;

  --grad-primary: linear-gradient(120deg, var(--purple), var(--blue) 55%, var(--cyan));
  --grad-warm: linear-gradient(120deg, var(--pink), var(--purple));

  /* type */
  --font-display: 'Sora', 'Inter', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* layout */
  --content-w: 1280px;
  --radius-card: 20px;
  --radius-sm: 12px;

  /* motion */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --dur-fast: 220ms;
  --dur-med: 380ms;
}

@media (prefers-reduced-motion: reduce){
  :root{ --dur-fast: 0ms; --dur-med: 0ms; }
}

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

html{ scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior: auto; }
}

body{
  margin: 0;
  background: var(--void);
  color: var(--text-hi);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* subtle film grain / depth wash so flat black doesn't feel cheap */
.grain{
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  opacity: 0.035;
  mix-blend-mode: overlay;
  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");
}

a{ color: inherit; text-decoration: none; }
ul{ margin: 0; padding: 0; list-style: none; }
img{ max-width: 100%; display: block; }

.skip-link{
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--purple);
  color: white;
  padding: 12px 18px;
  z-index: 999;
  border-radius: 0 0 8px 0;
}
.skip-link:focus{ left: 0; }

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

.section-inner{
  max-width: var(--content-w);
  margin: 0 auto;
  padding: 0 32px;
}

.section-title{
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 4vw, 2.75rem);
  letter-spacing: -0.01em;
  margin: 0 0 12px;
}

.section-sub{
  color: var(--text-mid);
  max-width: 52ch;
  margin: 0 0 48px;
  font-size: 1.05rem;
}

/* ===================== NAV ===================== */
.nav{
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  transition: background var(--dur-med) var(--ease-out), border-color var(--dur-med) var(--ease-out), backdrop-filter var(--dur-med) var(--ease-out);
  border-bottom: 1px solid transparent;
}
.nav.scrolled{
  background: rgba(8,8,15,0.72);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-soft);
}
.nav-inner{
  max-width: var(--content-w);
  margin: 0 auto;
  padding: 18px 32px;
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav-mark{
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
  background: var(--grad-primary);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.nav-links{
  display: flex;
  gap: 28px;
  margin-right: auto;
}
.nav-links a{
  font-size: 0.92rem;
  color: var(--text-mid);
  position: relative;
  padding: 4px 0;
  transition: color var(--dur-fast) var(--ease-out);
}
.nav-links a:hover{ color: var(--text-hi); }
.nav-links a.active{ color: var(--text-hi); }
.nav-links a.active::after{
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: -6px;
  height: 2px;
  background: var(--grad-primary);
  border-radius: 2px;
}
.nav-cta{
  font-size: 0.88rem;
  font-weight: 600;
  padding: 9px 18px;
  border-radius: 999px;
  border: 1px solid var(--border-soft);
  background: rgba(255,255,255,0.03);
  white-space: nowrap;
  transition: border-color var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-out);
}
.nav-cta:hover{ border-color: var(--border-glow); transform: translateY(-1px); }

.nav-toggle{
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px; height: 36px;
  background: none;
  border: none;
  cursor: pointer;
}
.nav-toggle span{
  display: block;
  height: 2px;
  background: var(--text-hi);
  border-radius: 2px;
}
.mobile-menu{
  display: none;
  flex-direction: column;
  background: rgba(8,8,15,0.97);
  border-bottom: 1px solid var(--border-soft);
  padding: 8px 32px 20px;
}
.mobile-menu a{
  padding: 12px 0;
  border-bottom: 1px solid var(--border-soft);
  color: var(--text-mid);
}
.mobile-menu.open{ display: flex; }

@media (max-width: 860px){
  .nav-links, .nav-cta{ display: none; }
  .nav-toggle{ display: flex; }
}

/* ===================== HERO ===================== */
.hero{
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  overflow: hidden;
  isolation: isolate;
}
.hero::before{
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(60% 50% at 78% 32%, rgba(155,107,255,0.20), transparent 70%),
    radial-gradient(50% 45% at 15% 75%, rgba(51,224,198,0.10), transparent 70%);
  z-index: -2;
}
.hero-scene{
  position: absolute;
  inset: 0;
  z-index: -1;
}
#heroCanvas{
  width: 100%;
  height: 100%;
  display: block;
}
.hero-fallback{
  display: none;
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.5;
}
.hero-scene.no-webgl #heroCanvas{ display: none; }
.hero-scene.no-webgl .hero-fallback{ display: block; }

.hero-content{
  position: relative;
  max-width: var(--content-w);
  margin: 0 auto;
  padding: 140px 32px 80px;
  width: 100%;
  max-width: 800px;
  margin-left: max(32px, calc(50% - 640px));
}
@media (max-width: 1100px){
  .hero-content{ margin-left: auto; margin-right: auto; padding-left: 32px; padding-right: 32px; }
}

.eyebrow{
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--cyan);
  margin: 0 0 20px;
}
.hero-title{
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.75rem, 7vw, 4.6rem);
  line-height: 1.04;
  letter-spacing: -0.02em;
  margin: 0 0 20px;
}
.hero-intro{
  display: flex;
  align-items: center;
  gap: clamp(16px, 2.5vw, 28px);
  margin: 0 0 24px;
}
.hero-intro .hero-title{ margin: 0; }
@media (min-width: 700px){
  .hero-intro .hero-title{ white-space: nowrap; }
}

/* profile photo: gradient ring that slowly rotates behind a still image */
.avatar{
  position: relative;
  flex-shrink: 0;
  width: clamp(76px, 9vw, 116px);
  aspect-ratio: 1;
  border-radius: 50%;
  padding: 3px;
  isolation: isolate;
}
.avatar::before{
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: conic-gradient(from 0deg, var(--purple), var(--blue), var(--cyan), var(--pink), var(--purple));
  animation: avatar-spin 8s linear infinite;
  z-index: -1;
}
.avatar::after{
  content: '';
  position: absolute;
  inset: -14px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(155,107,255,0.35), transparent 70%);
  z-index: -2;
}
.avatar img{
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 50% 30%;
  border-radius: 50%;
  border: 3px solid var(--void);
}
@keyframes avatar-spin{ to{ transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce){
  .avatar::before{ animation: none; }
}

.hero-sub{
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
  color: var(--text-mid);
  max-width: 46ch;
  margin: 0 0 14px;
}
.hero-sub strong{
  display: block;
  color: var(--text-hi);
  font-weight: 600;
  margin-bottom: 6px;
}
.hero-line{
  color: var(--text-low);
  max-width: 48ch;
  margin: 0 0 36px;
}
.hero-ctas{
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* reveal-on-load / reveal-on-scroll */
[data-reveal]{
  opacity: 0;
  transform: translateY(18px);
  transition: opacity var(--dur-med) var(--ease-out), transform var(--dur-med) var(--ease-out);
}
[data-reveal].in{
  opacity: 1;
  transform: none;
}
@media (prefers-reduced-motion: reduce){
  [data-reveal]{ opacity: 1; transform: none; transition: none; }
}

.scroll-cue{
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  width: 26px;
  height: 42px;
  border: 1.5px solid var(--border-soft);
  border-radius: 20px;
  display: flex;
  justify-content: center;
  padding-top: 8px;
}
.scroll-cue span{
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--cyan);
  animation: scrollcue 1.8s var(--ease-out) infinite;
}
@keyframes scrollcue{
  0%{ transform: translateY(0); opacity: 1; }
  70%{ transform: translateY(14px); opacity: 0; }
  100%{ transform: translateY(14px); opacity: 0; }
}
@media (prefers-reduced-motion: reduce){
  .scroll-cue span{ animation: none; }
}

/* ===================== BUTTONS ===================== */
.btn{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out);
  border: 1px solid transparent;
}
.btn-primary{
  background: var(--grad-primary);
  color: #05050a;
}
.btn-primary:hover{
  transform: translateY(-2px);
  box-shadow: 0 10px 30px -8px rgba(155,107,255,0.55);
}
.btn-ghost{
  border-color: var(--border-soft);
  color: var(--text-hi);
  background: rgba(255,255,255,0.02);
}
.btn-ghost:hover{
  border-color: var(--border-glow);
  transform: translateY(-2px);
}
.btn-small{
  padding: 9px 18px;
  font-size: 0.85rem;
}
.btn-outline{
  border-color: var(--border-soft);
  color: var(--text-mid);
}
.btn-outline:hover{
  border-color: var(--border-glow);
  color: var(--text-hi);
}
.text-link{
  color: var(--text-mid);
  font-weight: 500;
  border-bottom: 1px solid transparent;
  transition: color var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out);
}
.text-link:hover{
  color: var(--cyan);
  border-color: var(--cyan);
}

/* ===================== ABOUT ===================== */
.about{ padding: 140px 0 100px; position: relative; }
.about-grid{
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 64px;
  align-items: center;
}
.about-copy p{ color: var(--text-mid); max-width: 58ch; }
.about-copy p:first-of-type{ font-size: 1.08rem; }
.about-focus{ margin-top: 18px; }
.about-focus span{ color: var(--text-hi); font-weight: 600; }
.about-links{ display: flex; gap: 24px; margin-top: 28px; }

.about-links{ flex-wrap: wrap; }

.about-visual{ display: flex; justify-content: center; }
.pixel-orb{
  position: relative;
  width: 100%;
  max-width: 440px;
  aspect-ratio: 1;
}
.pixel-orb::before{
  content: '';
  position: absolute;
  inset: 12%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(155,107,255,0.28), rgba(79,141,255,0.10) 45%, transparent 70%);
  filter: blur(18px);
}
#pixelOrbCanvas{
  position: relative;
  width: 100%;
  height: 100%;
  display: block;
}
/* static stand-in when WebGL is unavailable */
.pixel-orb.no-webgl #pixelOrbCanvas{ display: none; }
.pixel-orb.no-webgl::after{
  content: '';
  position: absolute;
  inset: 22%;
  border-radius: 50%;
  background:
    repeating-linear-gradient(0deg, transparent 0 9px, var(--void) 9px 11px),
    repeating-linear-gradient(90deg, transparent 0 9px, var(--void) 9px 11px),
    radial-gradient(circle at 35% 30%, var(--cyan), var(--blue) 45%, var(--purple) 80%);
}

@media (max-width: 900px){
  .about-grid{ grid-template-columns: 1fr; gap: 24px; }
  .about-visual{ order: -1; }
  .pixel-orb{ max-width: 280px; }
}

/* ===================== CARDS (shared) ===================== */
.card-grid{
  display: grid;
  gap: 28px;
}
.card{
  background: linear-gradient(180deg, var(--surface), var(--surface-2));
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-card);
  padding: 30px;
  box-shadow: 0 20px 50px -30px rgba(0,0,0,0.7);
  transition: transform var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out);
}
.card:hover{
  transform: translateY(-6px);
  border-color: var(--border-glow);
  box-shadow: 0 26px 60px -28px rgba(155,107,255,0.35);
}

/* ===================== EXPERIENCE ===================== */
.experience{ padding: 100px 0; }
.experience-grid{
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
.exp-card{
  padding: 20px 20px 22px;
  border-radius: 16px;
  display: flex;
  flex-direction: column;
}
.exp-card:hover{ transform: translateY(-4px); }
.card-meta{
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
}
.card-org{
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.3;
  margin: 0 0 4px;
}
.card-role{
  color: var(--text-hi);
  opacity: 0.85;
  font-size: 0.82rem;
  font-weight: 500;
  margin: 0 0 10px;
}
.card-desc{
  color: var(--text-mid);
  font-size: 0.82rem;
  line-height: 1.55;
  margin: 0;
}
.pill{
  flex-shrink: 0;
  font-size: 0.68rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 999px;
  white-space: nowrap;
  border: 1px solid var(--border-soft);
}
.pill-internship{ color: var(--cyan); background: rgba(51,224,198,0.08); }
.pill-research{ color: var(--purple); background: rgba(155,107,255,0.10); }
.pill-campus{ color: var(--blue); background: rgba(79,141,255,0.08); }
.pill-leadership{ color: var(--pink); background: rgba(241,78,156,0.08); }
.pill-ambassador{ color: #ffb86b; background: rgba(255,184,107,0.08); }

.card-dates{
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-low);
  white-space: nowrap;
}

@media (max-width: 1100px){
  .experience-grid{ grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 620px){
  .experience-grid{ grid-template-columns: 1fr; }
}

/* ===================== PROJECTS ===================== */
.projects{ padding: 100px 0; }
.projects-grid{
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.project-card{ display: flex; flex-direction: column; }
.project-body{ flex: 1; display: flex; flex-direction: column; }
.project-links{ margin-top: auto; }
.project-card{ padding: 0; overflow: hidden; }
.project-media{
  aspect-ratio: 16 / 10;
  overflow: hidden;
  transform-style: preserve-3d;
}
.media-placeholder{
  width: 100%; height: 100%;
  display: flex;
  align-items: flex-end;
  padding: 20px;
  transition: transform var(--dur-med) var(--ease-out);
}
.media-placeholder span{
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  color: rgba(8,8,15,0.85);
}
.project-card:hover .media-placeholder{ transform: scale(1.03) rotate(-1deg); }

.grad-a{ background: linear-gradient(135deg, #9b6bff, #4f8dff); }
.grad-b{ background: linear-gradient(135deg, #33e0c6, #4f8dff); }
.grad-c{ background: linear-gradient(135deg, #f14e9c, #9b6bff); }
.grad-d{ background: linear-gradient(135deg, #4f8dff, #33e0c6); }

.project-body{ padding: 24px 24px 26px; }
.project-name{
  font-family: var(--font-display);
  font-size: 1.1rem;
  line-height: 1.3;
  font-weight: 700;
  margin: 0 0 10px;
}
.project-desc{
  color: var(--text-mid);
  font-size: 0.92rem;
  margin: 0 0 18px;
}
.tag-row{
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 22px;
}
.tag{
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-mid);
  border: 1px solid var(--border-soft);
  border-radius: 6px;
  padding: 4px 9px;
}
.project-links{ display: flex; gap: 12px; flex-wrap: wrap; }
.btn[aria-disabled="true"]{
  opacity: 0.45;
  pointer-events: none;
  cursor: default;
}

@media (max-width: 960px){
  .projects-grid{ grid-template-columns: 1fr; max-width: 560px; }
}

/* ===================== SKILLS ===================== */
.skills{ padding: 100px 0; }
.skills-grid{
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 40px 48px;
}
.skill-group h3{
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-mid);
  margin: 0 0 16px;
}
.chip-row{ display: flex; flex-wrap: wrap; gap: 10px; }
.chip{
  font-size: 0.85rem;
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid var(--border-soft);
  background: rgba(255,255,255,0.02);
  transition: border-color var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-out);
}
.chip:hover{
  border-color: var(--border-glow);
  transform: translateY(-2px);
}

@media (max-width: 700px){
  .skills-grid{ grid-template-columns: 1fr; }
}

/* ===================== CONTACT ===================== */
.contact{
  padding: 140px 0 120px;
  position: relative;
  overflow: hidden;
}
.contact-inner{
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
}
.contact-visual{
  position: absolute;
  top: -80px;
  left: 50%;
  transform: translateX(-50%);
  width: 480px;
  height: 480px;
  z-index: -1;
}
.orb{
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: radial-gradient(circle at 40% 35%, rgba(155,107,255,0.35), transparent 65%);
  filter: blur(10px);
}
.contact .section-title{ max-width: 16ch; }
.contact-sub{
  color: var(--text-mid);
  max-width: 46ch;
  margin-bottom: 36px;
}
.contact-email{
  margin-top: 22px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-low);
  transition: color var(--dur-fast) var(--ease-out);
}
.contact-email:hover{ color: var(--cyan); }
.contact-links{
  display: flex;
  align-items: center;
  gap: 28px;
  flex-wrap: wrap;
  justify-content: center;
}

/* ===================== FOOTER ===================== */
.site-footer{
  border-top: 1px solid var(--border-soft);
  padding: 28px 0;
}
.footer-inner{
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  color: var(--text-low);
  font-size: 0.82rem;
}

@media (max-width: 600px){
  .section-inner{ padding: 0 20px; }
  .experience, .projects, .skills{ padding: 72px 0; }
  .about{ padding: 100px 0 64px; }
  .contact{ padding: 100px 0 80px; }
}