/* ============================================================
   TABREJ ALAM — PORTFOLIO
   Design system: distributed-systems / circuit-lab aesthetic
   Palette: ink graphite ground, signal-cyan + amber-LED accents
   Type: Space Grotesk (display) + JetBrains Mono (data/labels)
   ============================================================ */
.nav__brand{
    display:flex;
    align-items:center;
    gap:12px;
    text-decoration:none;
}

.nav__brand-img{
    width:41px;
    height:42px;
    border-radius:50%;
    object-fit:cover;
    border:2px solid rgba(255,255,255,.15);
    transition:.3s ease;
    flex-shrink:0;
}

.nav__brand-img:hover{
    transform:scale(1.08);
    border-color:#00e5ff;
}

.nav__brand-text{
    font-size:1.15rem;
    font-weight:700;
    color:#fff;
}

.nav__brand-text .dim{
    color:#00e5ff;
}
:root {
  /* --- color tokens --- */
  --ink-950: #0a0c10;
  --ink-900: #0f1115;
  --ink-800: #15181e;
  --ink-700: #1c2028;
  --ink-600: #262b35;
  --ink-500: #3a4150;
  --line: #262b35;
  --line-soft: #1c2028;

  --paper: #e9edf1;
  --paper-dim: #9aa4b2;
  --paper-faint: #5f6776;

  --signal: #5eead4;      /* cyan-teal — data / accent primary */
  --signal-dim: #2dd4bf;
  --amber: #f5a623;       /* LED amber — secondary accent */
  --amber-dim: #d6890f;
  --danger-soft: #f87171;

  /* --- type tokens --- */
  --font-display: 'Space Grotesk', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* --- layout tokens --- */
  --maxw: 1180px;
  --pad: clamp(20px, 5vw, 64px);
  --radius: 14px;
  --radius-sm: 8px;
}

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

html, body {
  background: var(--ink-900);
  color: var(--paper);
  font-family: var(--font-display);
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body {
  position: relative;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

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

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

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

/* ============================================================
   SCROLL STATUS BAR
   ============================================================ */
.scroll-status {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--ink-700);
  z-index: 1000;
}
.scroll-status__fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--signal), var(--amber));
  transition: width 0.1s linear;
}

/* ============================================================
   NAV
   ============================================================ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 900;
  background: rgba(15, 17, 21, 0.72);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line-soft);
  transition: border-color 0.3s, background 0.3s;
}

.nav__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 16px var(--pad);
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  margin-right: auto;
}
.nav__brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border: 1px solid var(--signal);
  border-radius: 6px;
  color: var(--signal);
  font-size: 0.7rem;
  font-weight: 700;
}
.nav__brand-text { color: var(--paper); }
.dim { color: var(--amber); }

.nav__links {
  display: flex;
  gap: 28px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--paper-dim);
}
.nav__links a { position: relative; transition: color 0.2s; }
.nav__links a:hover { color: var(--signal); }
.nav__links a::after {
  content: '';
  position: absolute;
  left: 0; bottom: -6px;
  width: 0%; height: 1px;
  background: var(--signal);
  transition: width 0.25s ease;
}
.nav__links a:hover::after { width: 100%; }

.nav__cta {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  border: 1px solid var(--signal);
  color: var(--signal);
  padding: 8px 16px;
  border-radius: 999px;
  white-space: nowrap;
  transition: background 0.2s, color 0.2s;
}
.nav__cta:hover { background: var(--signal); color: var(--ink-950); }

.nav__burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}
.nav__burger span {
  display: block;
  width: 100%;
  height: 1.5px;
  background: var(--paper);
}

.mobile-menu {
  position: fixed;
  top: 0; right: 0;
  width: 70vw;
  max-width: 300px;
  height: 100vh;
  background: var(--ink-800);
  border-left: 1px solid var(--line);
  z-index: 950;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 90px 28px 40px;
  transform: translateX(100%);
  transition: transform 0.35s ease;
}
.mobile-menu.is-open { transform: translateX(0); }
.mobile-menu a {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--paper-dim);
  padding: 14px 0;
  border-bottom: 1px solid var(--line-soft);
}
.mobile-menu a:hover { color: var(--signal); }

/* ============================================================
   SHARED SECTION SCAFFOLDING
   ============================================================ */
main { position: relative; z-index: 1; }

.section {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 110px var(--pad);
}
.section--alt {
  background: linear-gradient(180deg, transparent, rgba(94,234,212,0.025), transparent);
  max-width: none;
  padding-left: 0; padding-right: 0;
}
.section--alt > * {
  max-width: var(--maxw);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--pad);
  padding-right: var(--pad);
}

.section__head { margin-bottom: 56px; max-width: 720px; }
.section__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--signal);
  letter-spacing: 0.04em;
  margin-bottom: 14px;
}
.section__title {
  font-size: clamp(1.8rem, 3.4vw, 2.6rem);
  font-weight: 600;
  line-height: 1.2;
  margin: 0 0 14px;
  color: var(--paper);
}
.section__desc {
  color: var(--paper-dim);
  font-size: 1.05rem;
  line-height: 1.65;
  margin: 0;
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 160px var(--pad) 80px;
  position: relative;
}

.hero__grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--paper-dim);
  margin: 0 0 22px;
  letter-spacing: 0.03em;
}
.eyebrow__dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 0 3px rgba(94,234,212,0.18);
  animation: pulse-dot 2.2s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero__title {
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.01em;
  margin: 0 0 24px;
  color: var(--paper);
}
.hero__title-accent {
  color: var(--signal);
  font-style: italic;
}

.hero__sub {
  font-size: 1.08rem;
  line-height: 1.7;
  color: var(--paper-dim);
  max-width: 540px;
  margin: 0 0 36px;
}
.hero__sub strong { color: var(--paper); font-weight: 600; }

.hero__cta-row {
  display: flex;
  gap: 14px;
  margin-bottom: 56px;
  flex-wrap: wrap;
}

.btn {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  padding: 13px 22px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: transform 0.2s ease, background 0.2s, color 0.2s, border-color 0.2s;
}
.btn--primary {
  background: var(--signal);
  color: var(--ink-950);
}
.btn--primary:hover { transform: translateY(-2px); background: var(--signal-dim); }
.btn__arrow { transition: transform 0.2s; }
.btn--primary:hover .btn__arrow { transform: translateX(3px); }

.btn--ghost {
  border: 1px solid var(--line);
  color: var(--paper-dim);
}
.btn--ghost:hover { border-color: var(--signal); color: var(--signal); transform: translateY(-2px); }

.hero__stats {
  display: flex;
  gap: 36px;
  flex-wrap: wrap;
}
.hero__stat { display: flex; flex-direction: column; gap: 4px; }
.hero__stat-num {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--signal);
}
.hero__stat-label {
  font-size: 0.76rem;
  color: var(--paper-faint);
  font-family: var(--font-mono);
  max-width: 120px;
  line-height: 1.4;
}

/* hero viz */
.hero__viz {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}
.fed-svg {
  width: 100%;
  max-width: 420px;
  filter: drop-shadow(0 0 40px rgba(94,234,212,0.08));
}
.ring {
  fill: none;
  stroke: var(--line);
  stroke-width: 1;
}
.ring--inner { stroke: var(--line-soft); }

.hero__viz-caption {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--paper-faint);
  letter-spacing: 0.03em;
}

.hero__scroll-cue {
  position: absolute;
  bottom: 18px;
  left: var(--pad);
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--paper-faint);
  letter-spacing: 0.08em;
}
.hero__scroll-line {
  width: 1px;
  height: 28px;
  background: linear-gradient(180deg, var(--signal), transparent);
  animation: scroll-cue 1.8s ease-in-out infinite;
}
@keyframes scroll-cue {
  0% { transform: scaleY(0.4); opacity: 0.3; }
  50% { transform: scaleY(1); opacity: 1; }
  100% { transform: scaleY(0.4); opacity: 0.3; }
}

/* SVG node/edge styling (federated diagram) */
.node-dot { fill: var(--ink-800); stroke: var(--signal); stroke-width: 1.6; }
.node-dot--server { fill: var(--signal); stroke: var(--signal); }
.node-label { font-family: var(--font-mono); font-size: 9px; fill: var(--paper-faint); }
.edge-line { stroke: var(--line); stroke-width: 1; fill: none; }
.pulse-packet { fill: var(--amber); }

/* ============================================================
   ABOUT
   ============================================================ */
.about__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 56px;
  align-items: start;
}
.about__text p {
  color: var(--paper-dim);
  font-size: 1.02rem;
  line-height: 1.75;
  margin: 0 0 20px;
}
.about__text strong { color: var(--paper); font-weight: 600; }

.about__timeline {
  border-left: 1px solid var(--line);
  padding-left: 24px;
  display: flex;
  flex-direction: column;
  gap: 22px;
}
.tl-item { display: flex; flex-direction: column; gap: 3px; position: relative; }
.tl-item::before {
  content: '';
  position: absolute;
  left: -29px;
  top: 6px;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 1.5px solid var(--signal);
}
.tl-year {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--signal);
}
.tl-text {
  font-size: 0.92rem;
  color: var(--paper-dim);
  line-height: 1.5;
}

/* ============================================================
   RESEARCH
   ============================================================ */
.research__cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 48px;
}
.r-card {
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: border-color 0.25s, transform 0.25s;
}
.r-card:hover { border-color: var(--signal-dim); transform: translateY(-3px); }
.r-card__num {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--amber);
  margin-bottom: 14px;
}
.r-card__title {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0 0 10px;
  color: var(--paper);
}
.r-card__text {
  font-size: 0.92rem;
  line-height: 1.6;
  color: var(--paper-dim);
  margin: 0;
}

.research__panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 36px;
  align-items: center;
}
.research__panel-left h3 {
  font-size: 1.05rem;
  margin: 0 0 12px;
  color: var(--signal);
}
.research__panel-left p {
  color: var(--paper-dim);
  font-size: 0.95rem;
  line-height: 1.65;
  margin: 0 0 18px;
}
.research__panel-left strong { color: var(--paper); }

.research__taglist {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.research__taglist li {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--paper-faint);
  padding-left: 16px;
  position: relative;
}
.research__taglist li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--amber);
}

.chart-svg { width: 100%; height: auto; }
.chart-axis { stroke: var(--line); stroke-width: 1; }
.chart-label { font-family: var(--font-mono); font-size: 9px; fill: var(--paper-faint); }
.chart-line { fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.chart-line--ghost { stroke: var(--paper-faint); opacity: 0.55; stroke-dasharray: 4 3; }
.chart-line--accent { stroke: var(--signal); }
.chart-tag { font-family: var(--font-mono); font-size: 9px; }
.chart-tag--ghost { fill: var(--paper-faint); }
.chart-tag--accent { fill: var(--signal); }

/* ============================================================
   BUILD LOG / PROJECTS
   ============================================================ */
.log {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.log__item {
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color 0.25s, transform 0.25s;
}
.log__item:hover { border-color: var(--amber-dim); transform: translateY(-3px); }
.log__meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
}
.log__dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--amber);
}
.log__type {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--paper-faint);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.log__title {
  font-size: 1.12rem;
  font-weight: 600;
  margin: 0 0 10px;
  color: var(--paper);
}
.log__text {
  font-size: 0.92rem;
  line-height: 1.6;
  color: var(--paper-dim);
  margin: 0 0 18px;
}
.log__chips {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.log__chips span {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--signal);
  border: 1px solid rgba(94,234,212,0.25);
  padding: 4px 10px;
  border-radius: 999px;
}

/* ============================================================
   SKILLS / STACK
   ============================================================ */
.stack__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  margin-bottom: 48px;
}
.stack__col-title {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--amber);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 0 0 16px;
}
.tag-row { display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--paper-dim);
  border: 1px solid var(--line);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: border-color 0.2s, color 0.2s;
}
.tag:hover { border-color: var(--signal); color: var(--paper); }

.interests {
  border-top: 1px solid var(--line);
  padding-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}
.interests__label { color: var(--paper-faint); }
.interests__item { color: var(--signal); }
.interests__sep { color: var(--line); }

/* ============================================================
   ACHIEVEMENTS / SIGNAL
   ============================================================ */
.signal__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.signal__card {
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
}
.signal__icon {
  font-family: var(--font-mono);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--amber);
  margin-bottom: 14px;
}
.signal__card p {
  font-size: 0.92rem;
  color: var(--paper-dim);
  line-height: 1.55;
  margin: 0;
}

/* ============================================================
   CONTACT
   ============================================================ */
.section--contact {
  background: radial-gradient(circle at 50% 0%, rgba(94,234,212,0.07), transparent 60%);
  max-width: none;
  text-align: center;
}
.contact__inner {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 var(--pad);
  display: flex;
  flex-direction: column;
  align-items: center;
}
.contact__title {
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  font-weight: 700;
  line-height: 1.2;
  margin: 16px 0 18px;
  color: var(--paper);
}
.contact__sub {
  color: var(--paper-dim);
  font-size: 1.02rem;
  line-height: 1.65;
  max-width: 520px;
  margin: 0 0 48px;
}

.contact__grid {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
.contact__card {
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 24px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  text-align: left;
  transition: border-color 0.25s, transform 0.25s;
}
.contact__card:not(.contact__card--static):hover {
  border-color: var(--signal);
  transform: translateY(-3px);
}
.contact__card-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--paper-faint);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.contact__card-value {
  font-size: 1rem;
  color: var(--paper);
  font-weight: 500;
  word-break: break-word;
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 36px var(--pad) 48px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--paper-faint);
  border-top: 1px solid var(--line-soft);
}

/* ============================================================
   REVEAL ON SCROLL
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 980px) {
  .nav__links { display: none; }
  .nav__cta { display: none; }
  .nav__burger { display: flex; }

  .hero__grid { grid-template-columns: 1fr; }
  .hero { padding-top: 140px; }
  .hero__viz { order: -1; max-width: 320px; margin: 0 auto 24px; }

  .about__grid { grid-template-columns: 1fr; gap: 40px; }
  .research__cards { grid-template-columns: 1fr; }
  .research__panel { grid-template-columns: 1fr; }
  .log { grid-template-columns: 1fr; }
  .stack__grid { grid-template-columns: repeat(2, 1fr); }
  .signal__grid { grid-template-columns: 1fr; }
  .contact__grid { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  .hero__title { font-size: 2.1rem; }
  .hero__stats { gap: 24px; }
  .section { padding: 80px var(--pad); }
  .stack__grid { grid-template-columns: 1fr; }
}