/* =========================================================
   Rajeev Kumar Sharma — Personal Portfolio
   Theme: Modern dark glassmorphism with fluid animations
   ========================================================= */
:root {
  --bg: #070b14;
  --bg-alt: #0a1020;
  --surface: rgba(255, 255, 255, 0.04);
  --surface-border: rgba(255, 255, 255, 0.08);
  --text: #e8edf5;
  --text-dim: #9aa7bd;
  --accent: #22d3ee;
  --accent-2: #6366f1;
  --accent-3: #a855f7;
  --gradient: linear-gradient(120deg, var(--accent), var(--accent-2), var(--accent-3));
  --radius: 18px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { font-family: 'Sora', sans-serif; line-height: 1.25; }

.container { width: min(1180px, 92%); margin-inline: auto; }

.gradient-text {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  background-size: 200% 200%;
  animation: gradientShift 6s ease infinite;
}

@keyframes gradientShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

/* ---------- Ambient background ---------- */
.bg-grid {
  position: fixed; inset: 0; z-index: -2;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 50%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 50%, transparent 100%);
}

.bg-glow {
  position: fixed; z-index: -1; border-radius: 50%;
  filter: blur(120px); opacity: 0.35; pointer-events: none;
  animation: float 14s ease-in-out infinite alternate;
}
.bg-glow--1 { width: 480px; height: 480px; top: -120px; left: -120px; background: var(--accent-2); }
.bg-glow--2 { width: 420px; height: 420px; bottom: -140px; right: -100px; background: var(--accent); animation-delay: -7s; }

@keyframes float {
  from { transform: translate(0, 0) scale(1); }
  to { transform: translate(40px, 60px) scale(1.15); }
}

/* ---------- Navigation ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: 18px 0;
  transition: padding 0.4s var(--ease), background 0.4s var(--ease), box-shadow 0.4s;
}
.nav.scrolled {
  padding: 10px 0;
  background: rgba(7, 11, 20, 0.75);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
}
.nav__inner { display: flex; align-items: center; justify-content: space-between; }
.nav__logo {
  font-family: 'Sora', sans-serif; font-weight: 800; font-size: 1.4rem;
  color: var(--text); text-decoration: none; letter-spacing: 1px;
}
.nav__logo span { color: var(--accent); }
.nav__links { display: flex; gap: 4px; align-items: center; }
.nav__link {
  color: var(--text-dim); text-decoration: none; font-size: 0.9rem; font-weight: 500;
  padding: 8px 13px; border-radius: 99px;
  transition: color 0.3s, background 0.3s;
}
.nav__link:hover, .nav__link.active { color: var(--text); background: var(--surface); }
.nav__link--cta {
  background: var(--gradient); color: #fff !important;
  background-size: 200% 200%; animation: gradientShift 6s ease infinite;
}
.nav__toggle { display: none; background: none; border: 0; cursor: pointer; flex-direction: column; gap: 5px; padding: 8px; }
.nav__toggle span { width: 24px; height: 2px; background: var(--text); border-radius: 2px; transition: 0.3s var(--ease); }
.nav__toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle.open span:nth-child(2) { opacity: 0; }
.nav__toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero { min-height: 100vh; display: flex; flex-direction: column; justify-content: center; padding: 150px 0 80px; position: relative; }
.hero__grid { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 48px; align-items: center; }
.hero__eyebrow { color: var(--accent); font-weight: 600; letter-spacing: 2px; text-transform: uppercase; font-size: 0.82rem; }
.hero__title { font-size: clamp(2.4rem, 5.5vw, 4.2rem); font-weight: 800; margin: 12px 0; }
.hero__role { font-size: clamp(1.1rem, 2.2vw, 1.5rem); font-weight: 600; color: var(--text); min-height: 2.2em; }
.cursor { color: var(--accent); animation: blink 1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }
.hero__desc { color: var(--text-dim); max-width: 560px; margin-top: 8px; font-size: 1.05rem; }
.hero__desc strong { color: var(--text); }
.hero__actions { display: flex; gap: 16px; margin-top: 32px; flex-wrap: wrap; }

.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 13px 28px; border-radius: 99px;
  font-weight: 600; font-size: 0.95rem; text-decoration: none;
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease), background 0.3s, border-color 0.3s;
  will-change: transform;
}
.btn--primary {
  background: var(--gradient); background-size: 200% 200%;
  animation: gradientShift 6s ease infinite;
  color: #fff; box-shadow: 0 8px 28px rgba(99, 102, 241, 0.35);
}
.btn--primary:hover { transform: translateY(-3px) scale(1.02); box-shadow: 0 14px 38px rgba(99, 102, 241, 0.5); }
.btn--ghost { border: 1px solid var(--surface-border); color: var(--text); background: var(--surface); backdrop-filter: blur(8px); }
.btn--ghost:hover { transform: translateY(-3px); background: rgba(255,255,255,0.08); border-color: var(--accent); }
.btn--lg { padding: 16px 36px; font-size: 1.05rem; }

.hero__stats { display: flex; gap: 44px; margin-top: 48px; flex-wrap: wrap; }
.stat { display: flex; flex-direction: row; align-items: baseline; gap: 2px; flex-wrap: wrap; }
.stat__num, .stat__plus { font-family: 'Sora', sans-serif; font-size: 2rem; font-weight: 700; color: var(--text); }
.stat__plus { color: var(--accent); }
.stat__label { font-size: 0.82rem; color: var(--text-dim); margin-top: 2px; flex-basis: 100%; }

/* Profile card */
.hero__visual { display: flex; justify-content: center; }
.profile-card { position: relative; width: 300px; height: 300px; }
.profile-card__ring {
  position: absolute; inset: -14px; border-radius: 50%;
  background: conic-gradient(from 0deg, var(--accent), var(--accent-2), var(--accent-3), var(--accent));
  animation: spin 8s linear infinite;
  filter: blur(1px);
}
.profile-card__ring::after {
  content: ''; position: absolute; inset: 5px; border-radius: 50%; background: var(--bg);
}
@keyframes spin { to { transform: rotate(360deg); } }
.profile-card__img, .profile-card__fallback {
  position: absolute; inset: 0; border-radius: 50%;
  width: 100%; height: 100%; object-fit: cover;
  border: 4px solid rgba(255,255,255,0.08);
}
.profile-card__fallback {
  display: none; align-items: center; justify-content: center;
  font-family: 'Sora', sans-serif; font-size: 4rem; font-weight: 800;
  background: linear-gradient(135deg, #101830, #1a1040);
  color: var(--accent);
  letter-spacing: 4px;
}
.profile-card__badge {
  position: absolute; padding: 8px 14px; border-radius: 99px;
  background: rgba(10, 16, 32, 0.85); border: 1px solid var(--surface-border);
  backdrop-filter: blur(10px); font-size: 0.8rem; font-weight: 600;
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
  animation: bob 5s ease-in-out infinite;
  white-space: nowrap;
}
.profile-card__badge--1 { top: 4%; right: -14%; animation-delay: 0s; }
.profile-card__badge--2 { bottom: 20%; left: -22%; animation-delay: -1.6s; }
.profile-card__badge--3 { bottom: -7%; right: 2%; animation-delay: -3.2s; }
@keyframes bob { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }

.scroll-hint {
  position: absolute; bottom: 28px; left: 50%; transform: translateX(-50%);
  width: 26px; height: 44px; border: 2px solid var(--text-dim); border-radius: 16px;
}
.scroll-hint span {
  position: absolute; top: 8px; left: 50%; width: 4px; height: 8px;
  background: var(--accent); border-radius: 2px; transform: translateX(-50%);
  animation: scrollDot 1.8s var(--ease) infinite;
}
@keyframes scrollDot { 0% { opacity: 1; top: 8px; } 70% { opacity: 0; top: 24px; } 100% { opacity: 0; } }

/* ---------- Sections ---------- */
.section { padding: 110px 0; }
.section--alt { background: linear-gradient(180deg, transparent, rgba(99, 102, 241, 0.05), transparent); }
.section__eyebrow { color: var(--accent); font-weight: 600; letter-spacing: 3px; text-transform: uppercase; font-size: 0.8rem; }
.section__title { font-size: clamp(1.9rem, 4vw, 2.8rem); font-weight: 800; margin: 10px 0 18px; }
.section__sub { color: var(--text-dim); max-width: 620px; margin-bottom: 36px; }

/* ---------- About ---------- */
.about__grid { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 48px; margin-top: 24px; align-items: start; }
.about__lead {
  font-family: 'Sora', sans-serif; font-size: 1.15rem; font-weight: 600;
  color: var(--text) !important;
  border-left: 3px solid var(--accent); padding-left: 18px;
}
.about__text p { color: var(--text-dim); margin-bottom: 18px; font-size: 1rem; }
.about__text strong { color: var(--text); }
.about__cards { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; position: sticky; top: 100px; }
.mini-card {
  background: var(--surface); border: 1px solid var(--surface-border);
  border-radius: var(--radius); padding: 22px;
  transition: transform 0.4s var(--ease), border-color 0.4s, background 0.4s;
}
.mini-card:hover { transform: translateY(-6px); border-color: var(--accent); background: rgba(34, 211, 238, 0.06); }
.mini-card__icon { font-size: 1.6rem; }
.mini-card h3 { font-size: 0.98rem; margin: 10px 0 6px; }
.mini-card p { font-size: 0.84rem; color: var(--text-dim); }

/* ---------- Skills ---------- */
.skills__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; margin-top: 24px; }
.skill-card {
  background: var(--surface); border: 1px solid var(--surface-border);
  border-radius: var(--radius); padding: 30px;
  position: relative; overflow: hidden;
  transition: transform 0.45s var(--ease), border-color 0.45s, box-shadow 0.45s;
}
.skill-card::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(400px circle at var(--mx, 50%) var(--my, 50%), rgba(34, 211, 238, 0.1), transparent 60%);
  opacity: 0; transition: opacity 0.4s;
  pointer-events: none;
}
.skill-card:hover::before { opacity: 1; }
.skill-card:hover { transform: translateY(-8px); border-color: rgba(34, 211, 238, 0.5); box-shadow: 0 20px 50px rgba(0,0,0,0.45); }
.skill-card__icon { font-size: 2rem; margin-bottom: 14px; }
.skill-card h3 { font-size: 1.12rem; margin-bottom: 10px; }
.skill-card p { font-size: 0.89rem; color: var(--text-dim); }
.skill-card__bar { height: 5px; background: rgba(255,255,255,0.07); border-radius: 99px; margin-top: 20px; overflow: hidden; }
.skill-card__bar span {
  display: block; height: 100%; width: 0; border-radius: 99px;
  background: var(--gradient);
  transition: width 1.4s var(--ease) 0.3s;
}
.skill-card.in-view .skill-card__bar span { width: var(--w); }

/* ---------- Timeline ---------- */
.timeline { position: relative; margin-top: 40px; padding-left: 32px; }
.timeline::before {
  content: ''; position: absolute; left: 7px; top: 8px; bottom: 8px; width: 2px;
  background: linear-gradient(180deg, var(--accent), var(--accent-2), var(--accent-3));
  border-radius: 2px;
}
.timeline__item { position: relative; margin-bottom: 36px; }
.timeline__dot {
  position: absolute; left: -32px; top: 8px; width: 16px; height: 16px;
  background: var(--bg); border: 3px solid var(--accent); border-radius: 50%;
  box-shadow: 0 0 0 6px rgba(34, 211, 238, 0.12);
}
.timeline__card {
  background: var(--surface); border: 1px solid var(--surface-border);
  border-radius: var(--radius); padding: 28px 32px;
  transition: transform 0.4s var(--ease), border-color 0.4s;
}
.timeline__card:hover { transform: translateX(8px); border-color: rgba(99, 102, 241, 0.5); }
.timeline__period { color: var(--accent); font-size: 0.8rem; font-weight: 600; letter-spacing: 0.8px; text-transform: uppercase; }
.timeline__card h3 { margin: 8px 0 12px; font-size: 1.25rem; }
.timeline__card ul { list-style: none; }
.timeline__card li { color: var(--text-dim); font-size: 0.94rem; padding-left: 22px; position: relative; margin-bottom: 8px; }
.timeline__card li::before { content: '▸'; position: absolute; left: 0; color: var(--accent); }
.timeline__card li strong { color: var(--text); }

/* ---------- Projects ---------- */
.projects__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; margin-top: 24px; }
.project-card {
  background: var(--surface); border: 1px solid var(--surface-border);
  border-radius: var(--radius); padding: 28px;
  position: relative; overflow: hidden;
  transition: transform 0.45s var(--ease), border-color 0.45s, box-shadow 0.45s;
}
.project-card::after {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--gradient); background-size: 200% 200%;
  animation: gradientShift 6s ease infinite;
  transform: scaleX(0); transform-origin: left;
  transition: transform 0.5s var(--ease);
}
.project-card:hover::after { transform: scaleX(1); }
.project-card:hover { transform: translateY(-8px); border-color: rgba(168, 85, 247, 0.45); box-shadow: 0 20px 50px rgba(0,0,0,0.45); }
.project-card__icon { font-size: 1.9rem; margin-bottom: 12px; }
.project-card h3 { font-size: 1.05rem; margin-bottom: 10px; }
.project-card p { font-size: 0.87rem; color: var(--text-dim); }

/* ---------- Education ---------- */
.edu__grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; margin-top: 24px; }
.edu-card {
  background: var(--surface); border: 1px solid var(--surface-border);
  border-radius: var(--radius); padding: 28px;
  display: flex; flex-direction: column; gap: 6px;
  transition: transform 0.4s var(--ease), border-color 0.4s;
}
.edu-card:hover { transform: translateY(-6px); border-color: var(--accent); }
.edu-card__icon { font-size: 1.8rem; }
.edu-card h3 { font-size: 1.05rem; }
.edu-card p { font-size: 0.88rem; color: var(--text-dim); }
.edu-card--honor { border-color: rgba(34, 211, 238, 0.35); background: rgba(34, 211, 238, 0.05); }

/* ---------- Tags / interests ---------- */
.tags { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 12px; }
.tag {
  padding: 10px 20px; border-radius: 99px;
  background: var(--surface); border: 1px solid var(--surface-border);
  font-size: 0.88rem; font-weight: 500; color: var(--text-dim);
  transition: transform 0.35s var(--ease), border-color 0.35s, color 0.35s, background 0.35s;
  cursor: default;
}
.tag:hover { transform: translateY(-4px) scale(1.04); border-color: var(--accent); color: var(--text); background: rgba(34, 211, 238, 0.08); }
.tag--hot {
  background: var(--gradient); background-size: 200% 200%;
  animation: gradientShift 6s ease infinite;
  color: #fff; border: none; font-weight: 600;
}
.quote { margin-top: 56px; text-align: center; }
.quote blockquote { font-family: 'Sora', sans-serif; font-size: clamp(1.2rem, 2.6vw, 1.7rem); font-weight: 600; max-width: 760px; margin-inline: auto; }
.quote cite { display: block; margin-top: 14px; color: var(--text-dim); font-size: 0.9rem; }

/* ---------- Contact ---------- */
.contact { text-align: center; }
.contact .section__sub { margin-inline: auto; }
.contact__actions { display: flex; gap: 18px; justify-content: center; flex-wrap: wrap; margin-top: 16px; }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--surface-border); padding: 32px 0; }
.footer__inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 10px; color: var(--text-dim); font-size: 0.88rem; }
.footer__tag { color: var(--accent); }

/* ---------- Reveal animations ---------- */
.reveal {
  opacity: 0; transform: translateY(36px);
  transition: opacity 0.9s var(--ease) var(--d, 0s), transform 0.9s var(--ease) var(--d, 0s);
  will-change: opacity, transform;
}
.reveal.in-view { opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  .reveal { opacity: 1; transform: none; }
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .skills__grid, .projects__grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 960px) {
  .hero__grid { grid-template-columns: 1fr; text-align: center; }
  .hero__desc, .section__sub { margin-inline: auto; }
  .hero__actions, .hero__stats { justify-content: center; }
  .hero__visual { order: -1; margin-top: 20px; }
  .profile-card { width: 220px; height: 220px; }
  .about__grid { grid-template-columns: 1fr; }
  .about__cards { position: static; }
  .edu__grid { grid-template-columns: 1fr; }
}

@media (max-width: 680px) {
  .nav__links {
    position: fixed; top: 64px; right: 4%; left: 4%;
    flex-direction: column; align-items: stretch; text-align: center;
    background: rgba(10, 16, 32, 0.96); backdrop-filter: blur(20px);
    border: 1px solid var(--surface-border); border-radius: var(--radius);
    padding: 18px; gap: 8px;
    transform: translateY(-16px); opacity: 0; pointer-events: none;
    transition: 0.4s var(--ease);
  }
  .nav__links.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .nav__toggle { display: flex; }
  .skills__grid, .projects__grid { grid-template-columns: 1fr; }
  .about__cards { grid-template-columns: 1fr; }
  .section { padding: 80px 0; }
  .profile-card__badge--2 { left: -8%; }
  .timeline__card { padding: 22px; }
}