/* ============================================================
   Anshuman Singh — Portfolio
   Theme: engineer / integration architect
   ============================================================ */

:root {
  /* Dark theme (default) */
  --bg: #0a0e16;
  --bg-soft: #0f1522;
  --surface: #131a2a;
  --surface-2: #18213400;
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.14);
  --text: #e8edf6;
  --text-soft: #aab4c5;
  --text-dim: #6b7689;
  --accent: #2f7df6;       /* MuleSoft-ish blue */
  --accent-2: #00c9a7;     /* teal */
  --accent-glow: rgba(47, 125, 246, 0.5);
  --grad: linear-gradient(120deg, #3b8bff 0%, #00d2b4 100%);

  --radius: 16px;
  --radius-sm: 10px;
  --maxw: 1120px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --shadow: 0 18px 50px -20px rgba(0, 0, 0, 0.6);
  --font: "Inter", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

[data-theme="light"] {
  --bg: #f6f8fc;
  --bg-soft: #eef2f9;
  --surface: #ffffff;
  --surface-2: #ffffff;
  --border: rgba(15, 30, 60, 0.10);
  --border-strong: rgba(15, 30, 60, 0.18);
  --text: #0f1c30;
  --text-soft: #44546c;
  --text-dim: #7d8aa0;
  --accent: #1a6df0;
  --accent-2: #009e84;
  --accent-glow: rgba(26, 109, 240, 0.28);
  --grad: linear-gradient(120deg, #1a6df0 0%, #009e84 100%);
  --shadow: 0 18px 44px -24px rgba(20, 50, 100, 0.28);
}

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

html { scroll-behavior: smooth; scroll-padding-top: 90px; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background 0.4s var(--ease), color 0.4s var(--ease);
}

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

a { color: inherit; text-decoration: none; }
strong { color: var(--text); font-weight: 600; }
.nowrap { white-space: nowrap; }
.grad {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- Background decoration ---------- */
.bg-grid {
  position: fixed;
  inset: 0;
  z-index: -2;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 54px 54px;
  mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, #000 0%, transparent 75%);
  opacity: 0.6;
}
.bg-glow {
  position: fixed;
  top: -240px; left: 50%;
  transform: translateX(-50%);
  width: 900px; height: 600px;
  z-index: -2;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 60%);
  filter: blur(40px);
  opacity: 0.55;
  pointer-events: none;
}

/* ---------- Layout helpers ---------- */
.section {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 96px 28px;
}
.section__head {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 48px;
}
.section__index {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--accent);
  font-weight: 600;
  letter-spacing: 0.05em;
}
.section__title {
  font-size: clamp(1.5rem, 3.5vw, 2.1rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}
.section__rule {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--border-strong), transparent);
}

/* ---------- Navigation ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}
.nav.scrolled { border-bottom-color: var(--border); }
.nav__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 14px 28px;
  display: flex;
  align-items: center;
  gap: 20px;
}
.nav__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.nav__brand-mark {
  display: grid;
  place-items: center;
  width: 34px; height: 34px;
  border-radius: 9px;
  background: var(--grad);
  color: #fff;
  font-family: var(--mono);
  font-size: 0.85rem;
  font-weight: 700;
  box-shadow: 0 6px 18px -6px var(--accent-glow);
}
.nav__links {
  display: flex;
  gap: 28px;
  margin-left: auto;
  font-size: 0.92rem;
  color: var(--text-soft);
}
.nav__links a { position: relative; transition: color 0.2s; }
.nav__links a::after {
  content: "";
  position: absolute; left: 0; bottom: -6px;
  width: 0; height: 2px;
  background: var(--grad);
  transition: width 0.25s var(--ease);
}
.nav__links a:hover { color: var(--text); }
.nav__links a:hover::after { width: 100%; }
.nav__actions { display: flex; align-items: center; gap: 12px; }
.nav__links-resume { display: none; } /* desktop uses the button in nav__actions */

.theme-toggle {
  width: 38px; height: 38px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-soft);
  cursor: pointer;
  font-size: 1.05rem;
  display: grid; place-items: center;
  transition: all 0.2s var(--ease);
}
.theme-toggle:hover { color: var(--text); border-color: var(--border-strong); transform: translateY(-1px); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 22px;
  border-radius: 11px;
  font-weight: 600;
  font-size: 0.92rem;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease), background 0.2s, border-color 0.2s;
  white-space: nowrap;
}
.btn--primary {
  background: var(--grad);
  color: #fff;
  box-shadow: 0 10px 28px -10px var(--accent-glow);
}
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 16px 34px -10px var(--accent-glow); }
.btn--ghost {
  background: var(--surface);
  color: var(--text);
  border-color: var(--border-strong);
}
.btn--ghost:hover { transform: translateY(-2px); border-color: var(--accent); color: var(--accent); }
.nav__resume { padding: 8px 16px; font-size: 0.86rem; }

.nav__burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none; border: none; cursor: pointer;
  padding: 6px;
}
.nav__burger span {
  width: 24px; height: 2px; background: var(--text);
  border-radius: 2px; transition: 0.3s var(--ease);
}
.nav__burger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__burger.open span:nth-child(2) { opacity: 0; }
.nav__burger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 80px 28px 72px;
  display: grid;
  grid-template-columns: 1.25fr 0.9fr;
  gap: 56px;
  align-items: center;
  min-height: 84vh;
}
.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--text-soft);
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 99px;
  background: var(--surface);
  margin-bottom: 26px;
}
.dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent-2);
  box-shadow: 0 0 0 0 var(--accent-2);
  animation: pulse 2.2s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(0, 201, 167, 0.55); }
  70% { box-shadow: 0 0 0 9px rgba(0, 201, 167, 0); }
  100% { box-shadow: 0 0 0 0 rgba(0, 201, 167, 0); }
}
.hero__title {
  font-size: clamp(2.6rem, 7vw, 4.6rem);
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.02;
}
.hero__role {
  font-size: clamp(1.15rem, 2.6vw, 1.7rem);
  font-weight: 600;
  color: var(--text-soft);
  margin-top: 10px;
  letter-spacing: -0.01em;
}
.hero__lede {
  margin-top: 24px;
  color: var(--text-soft);
  font-size: 1.05rem;
  max-width: 54ch;
}
.hero__stats {
  display: grid;
  grid-template-columns: repeat(4, auto);
  gap: 30px;
  margin-top: 38px;
  flex-wrap: wrap;
}
.stat { display: flex; flex-direction: column; gap: 2px; }
.stat__num {
  font-family: var(--mono);
  font-size: 1.7rem;
  font-weight: 700;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  line-height: 1;
}
.stat__label {
  font-size: 0.78rem;
  color: var(--text-dim);
  max-width: 12ch;
}
.hero__cta {
  display: flex;
  gap: 14px;
  margin-top: 40px;
  flex-wrap: wrap;
}

/* Hero visual — API-led flow card */
.hero__visual { display: flex; justify-content: center; }
.flow-card {
  width: 100%;
  max-width: 360px;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  animation: float 6s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}
.flow-card__head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 70%, var(--bg));
}
.flow-card__dots { display: flex; gap: 6px; }
.flow-card__dots i { width: 10px; height: 10px; border-radius: 50%; background: var(--border-strong); }
.flow-card__dots i:nth-child(1) { background: #ff5f57; }
.flow-card__dots i:nth-child(2) { background: #febc2e; }
.flow-card__dots i:nth-child(3) { background: #28c840; }
.flow-card__file {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--text-dim);
}
.flow-card__body { padding: 22px 18px; }
.flow-layer {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-soft);
}
.flow-layer__tag {
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 4px 8px;
  border-radius: 6px;
  color: #fff;
}
.flow-layer--exp .flow-layer__tag { background: #3b8bff; }
.flow-layer--pro .flow-layer__tag { background: #7a5cff; }
.flow-layer--sys .flow-layer__tag { background: #00c9a7; }
.flow-layer__name { font-size: 0.92rem; font-weight: 500; }
.flow-arrow {
  display: flex;
  justify-content: center;
  padding: 6px 0;
}
.flow-arrow span {
  width: 2px; height: 18px;
  background: linear-gradient(var(--accent), transparent);
  position: relative;
}
.flow-arrow span::after {
  content: "";
  position: absolute;
  bottom: -2px; left: 50%;
  transform: translateX(-50%);
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid var(--accent);
}
.flow-card__foot {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}
.chip {
  font-family: var(--mono);
  font-size: 0.72rem;
  padding: 4px 10px;
  border-radius: 7px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  color: var(--text-soft);
}

/* ---------- About ---------- */
.about {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 48px;
  align-items: start;
}
.about__text p { color: var(--text-soft); margin-bottom: 18px; font-size: 1.04rem; }
.about__highlights {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 26px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.about__highlights li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.95rem;
  color: var(--text-soft);
}
.hl__icon { color: var(--accent-2); font-size: 0.85rem; margin-top: 3px; }

/* ---------- Skills ---------- */
.skills {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.skill-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  position: relative;
  overflow: hidden;
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease);
}
.skill-card::before {
  content: "";
  position: absolute; inset: 0;
  background: radial-gradient(420px circle at var(--mx, 50%) var(--my, 0%), var(--accent-glow), transparent 45%);
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
}
.skill-card:hover { transform: translateY(-4px); border-color: var(--border-strong); }
.skill-card:hover::before { opacity: 0.16; }
.skill-card--feature {
  grid-column: 1 / -1;
  border-color: color-mix(in srgb, var(--accent) 40%, var(--border));
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--accent) 8%, var(--surface)), var(--surface));
}
.skill-card__icon {
  font-size: 1.5rem;
  width: 48px; height: 48px;
  display: grid; place-items: center;
  border-radius: 12px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  margin-bottom: 16px;
  color: var(--accent);
}
.skill-card h3 { font-size: 1.15rem; font-weight: 700; letter-spacing: -0.01em; }
.skill-card__note {
  display: inline-block;
  margin: 6px 0 4px;
  font-family: var(--mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-2);
}
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}
.tags span {
  font-size: 0.82rem;
  padding: 6px 12px;
  border-radius: 8px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  color: var(--text-soft);
  transition: all 0.2s var(--ease);
}
.tags span:hover { color: var(--text); border-color: var(--accent); transform: translateY(-2px); }

/* ---------- Experience timeline ---------- */
.timeline { display: flex; flex-direction: column; gap: 4px; }
.job { display: grid; grid-template-columns: 32px 1fr; gap: 18px; }
.job__line { position: relative; display: flex; justify-content: center; }
.job__line::before {
  content: "";
  position: absolute;
  top: 8px; bottom: -4px;
  width: 2px;
  background: linear-gradient(var(--border-strong), var(--border));
}
.job:last-child .job__line::before { bottom: 50%; }
.job__dot {
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--bg);
  border: 3px solid var(--accent);
  margin-top: 6px;
  z-index: 1;
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 18%, transparent);
}
.job__card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 28px;
  margin-bottom: 22px;
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.job__card:hover {
  transform: translateX(4px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow);
}
.job__top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  flex-wrap: wrap;
}
.job__role { font-size: 1.18rem; font-weight: 700; letter-spacing: -0.01em; }
.job__org {
  color: var(--accent);
  font-weight: 600;
  font-size: 0.96rem;
  margin-top: 2px;
}
.job__meta { text-align: right; display: flex; flex-direction: column; gap: 2px; }
.job__period { font-family: var(--mono); font-size: 0.82rem; color: var(--text-soft); }
.job__loc { font-size: 0.8rem; color: var(--text-dim); }
.badge {
  display: inline-block;
  margin: 14px 0 4px;
  font-size: 0.74rem;
  font-weight: 600;
  font-family: var(--mono);
  padding: 4px 12px;
  border-radius: 99px;
  letter-spacing: 0.02em;
}
.badge--banking { background: rgba(59, 139, 255, 0.14); color: #6fa8ff; border: 1px solid rgba(59,139,255,0.3); }
.badge--edtech  { background: rgba(0, 201, 167, 0.14); color: #2bd9b8; border: 1px solid rgba(0,201,167,0.3); }
.badge--mfg     { background: rgba(255, 159, 67, 0.14); color: #ffb066; border: 1px solid rgba(255,159,67,0.3); }
.badge--food    { background: rgba(255, 99, 132, 0.14); color: #ff8099; border: 1px solid rgba(255,99,132,0.3); }
.job__points {
  list-style: none;
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 11px;
}
.job__points li {
  position: relative;
  padding-left: 22px;
  color: var(--text-soft);
  font-size: 0.96rem;
}
.job__points li::before {
  content: "▹";
  position: absolute;
  left: 0;
  color: var(--accent);
}

/* ---------- Cert & Education ---------- */
.cert-edu {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.cert-block, .edu-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px;
}
.block__title {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border);
}
.cert-list { list-style: none; display: flex; flex-direction: column; gap: 14px; }
.cert-list li {
  display: flex; align-items: center; gap: 12px;
  font-size: 0.96rem; color: var(--text-soft);
}
.cert__mark { color: var(--accent-2); }
.edu-list { list-style: none; display: flex; flex-direction: column; gap: 20px; }
.edu__row { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; }
.edu__deg { font-weight: 600; color: var(--text); }
.edu__year { font-family: var(--mono); font-size: 0.8rem; color: var(--text-dim); }
.edu__school { font-size: 0.9rem; color: var(--text-soft); }

/* ---------- LinkedIn hero button ---------- */
.btn--linkedin .icon-linkedin {
  transition: color 0.2s var(--ease);
}
.btn--linkedin:hover { color: #0a66c2; border-color: #0a66c2; }

/* ---------- Footer ---------- */
.footer {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 40px 28px 56px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  border-top: 1px solid var(--border);
  color: var(--text-dim);
  font-size: 0.86rem;
  flex-wrap: wrap;
}
.footer__built { font-family: var(--mono); font-size: 0.78rem; }

/* ---------- Reveal animation ---------- */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal.in { opacity: 1; transform: none; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 40px;
    min-height: auto;
    padding-top: 56px;
  }
  .flow-card { max-width: 320px; }
  .about { grid-template-columns: 1fr; gap: 30px; }
  .skills { grid-template-columns: 1fr; }
  .cert-edu { grid-template-columns: 1fr; }
}

@media (max-width: 680px) {
  .nav__links { display: none; }
  .nav__resume { display: none; }
  .nav__burger { display: flex; }
  .nav__actions { margin-left: auto; }

  .hero__visual { display: none; }

  .nav__links.mobile-open {
    display: flex;
    position: absolute;
    top: 100%; left: 0; right: 0;
    flex-direction: column;
    gap: 0;
    margin: 0;
    padding: 8px 0;
    background: var(--bg-soft);
    border-bottom: 1px solid var(--border);
  }
  .nav__links.mobile-open a { padding: 14px 28px; }
  .nav__links.mobile-open a::after { display: none; }
  .nav__links.mobile-open .nav__links-resume {
    display: block;
    color: var(--accent);
    font-weight: 600;
    border-top: 1px solid var(--border);
    margin-top: 4px;
  }

  .section { padding: 72px 22px; }
  .hero { padding: 48px 22px 56px; }
  .hero__stats { grid-template-columns: repeat(2, 1fr); gap: 22px; }
  .job { grid-template-columns: 20px 1fr; gap: 12px; }
  .job__card { padding: 22px; }
  .job__meta { text-align: left; }
  .job__top { flex-direction: column; gap: 8px; }
  .footer { flex-direction: column; text-align: center; }
}