/* ==========================================================================
   MD. Rezaul Karim — Portfolio
   Aesthetic: "Systems Engineer's Console"
   Dark slate · blueprint grid · grain · emerald→cyan accents
   Type: Bricolage Grotesque (display) · IBM Plex Sans (body) · JetBrains Mono
   ========================================================================== */

/* ----------------------------------- Tokens ----------------------------- */
:root {
  --font-display: "Bricolage Grotesque", "Segoe UI", sans-serif;
  --font-sans: "IBM Plex Sans", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", monospace;

  --bg: #0a0e14;
  --bg-soft: #0c1018;
  --surface: #10151f;
  --surface-2: #141b29;
  --surface-3: #19212f;
  --border: rgba(148, 163, 184, 0.12);
  --border-strong: rgba(148, 163, 184, 0.24);

  --text: #e8eef6;
  --text-soft: #b3bece;
  --muted: #7c8898;
  --faint: #6e7c90;

  --accent: #34d399;        /* emerald */
  --accent-2: #22d3ee;      /* cyan    */
  --accent-ink: #07120d;
  --accent-soft: rgba(52, 211, 153, 0.12);
  --accent-line: rgba(52, 211, 153, 0.32);
  --glow: rgba(52, 211, 153, 0.16);
  --glow-2: rgba(34, 211, 238, 0.12);

  --r-xs: 8px;
  --r-sm: 12px;
  --r: 16px;
  --r-lg: 22px;
  --r-xl: 30px;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow: 0 18px 40px -18px rgba(0, 0, 0, 0.7);
  --shadow-glow: 0 0 0 1px var(--accent-line), 0 20px 50px -20px var(--glow);

  --maxw: 1180px;
  --gutter: clamp(1.1rem, 4vw, 2.5rem);
  --nav-h: 68px;

  --ease: cubic-bezier(0.22, 0.68, 0.16, 1);
}

/* ----------------------------------- Reset ------------------------------ */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 14px);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: clamp(0.96rem, 0.92rem + 0.2vw, 1.05rem);
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input, textarea { font-family: inherit; }
ul { list-style: none; padding: 0; }

::selection { background: var(--accent); color: var(--accent-ink); }

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

/* ------------------------------ Atmosphere ------------------------------ */
/* Faint blueprint grid that fades toward the bottom of the viewport top */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 58px 58px;
  -webkit-mask-image: radial-gradient(125% 90% at 75% -10%, #000 25%, transparent 72%);
          mask-image: radial-gradient(125% 90% at 75% -10%, #000 25%, transparent 72%);
  opacity: 0.55;
  z-index: 0;
  pointer-events: none;
}

/* Ambient color glows */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(48rem 38rem at 82% -8%, var(--glow), transparent 60%),
    radial-gradient(40rem 32rem at -10% 12%, var(--glow-2), transparent 62%);
  z-index: 0;
  pointer-events: none;
}

/* Film grain */
.grain {
  position: fixed;
  inset: -50%;
  width: 200%;
  height: 200%;
  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='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* keep content above atmosphere */
.nav, main, .site-footer { position: relative; z-index: 2; }

/* --------------------------------- Layout ------------------------------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(4rem, 9vw, 7.5rem); }
.section--tight { padding-block: clamp(3rem, 6vw, 5rem); }

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  background: var(--accent);
  color: var(--accent-ink);
  padding: 0.6rem 1rem;
  border-radius: var(--r-xs);
  font-weight: 600;
  z-index: 999;
  transition: top 0.25s var(--ease);
}
.skip-link:focus { top: 1rem; }

/* ------------------------------- Typography ----------------------------- */
.display {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.02;
  letter-spacing: -0.02em;
}

.mono {
  font-family: var(--font-mono);
  font-feature-settings: "ss01";
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
}
.eyebrow::before {
  content: "";
  width: 1.6rem;
  height: 1px;
  background: var(--accent-line);
}

.accent { color: var(--accent); }
.text-soft { color: var(--text-soft); }
.muted { color: var(--muted); }

/* Section heading */
.section-head { margin-bottom: clamp(2rem, 4vw, 3.25rem); }
.section-head__index {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  color: var(--accent);
}
.section-head__index .slash { color: var(--faint); }
.section-head__title {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.05;
  font-size: clamp(1.85rem, 1.2rem + 3vw, 3.1rem);
  margin-top: 0.5rem;
}
.section-head__sub {
  color: var(--text-soft);
  margin-top: 0.85rem;
  max-width: 56ch;
}

/* --------------------------------- Buttons ------------------------------ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.82rem 1.4rem;
  border-radius: var(--r-sm);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.01em;
  transition: transform 0.25s var(--ease), background 0.25s var(--ease),
    border-color 0.25s var(--ease), box-shadow 0.25s var(--ease), color 0.25s var(--ease);
  border: 1px solid transparent;
  white-space: nowrap;
}
.btn svg { width: 1.05em; height: 1.05em; }
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn--primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: var(--accent-ink);
  box-shadow: 0 12px 28px -12px var(--glow);
}
.btn--primary:hover { box-shadow: 0 18px 40px -14px var(--glow); }

.btn--ghost {
  border-color: var(--border-strong);
  color: var(--text);
  background: rgba(255, 255, 255, 0.015);
}
.btn--ghost:hover { border-color: var(--accent-line); color: var(--accent); background: var(--accent-soft); }

.btn--block { width: 100%; justify-content: center; }

/* ---------------------------------- Chips ------------------------------- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 0.34rem 0.7rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-soft);
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease), background 0.2s var(--ease);
}
.chip:hover { border-color: var(--accent-line); color: var(--accent); }
.chip--dot::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

/* ------------------------------ Navigation ------------------------------ */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  background: rgba(10, 14, 20, 0.7);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}
.nav.is-scrolled {
  border-bottom-color: var(--border);
  background: rgba(10, 14, 20, 0.85);
}
.nav__inner {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.brand {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.02rem;
  display: inline-flex;
  align-items: center;
  gap: 0.1rem;
  letter-spacing: -0.01em;
}
.brand .tilde { color: var(--accent); }
.brand .cursor {
  width: 9px; height: 1.05em;
  background: var(--accent);
  display: inline-block;
  margin-left: 3px;
  translate: 0 2px;
  animation: blink 1.1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.nav__links {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}
.nav__link {
  font-size: 0.92rem;
  color: var(--text-soft);
  padding: 0.5rem 0.8rem;
  border-radius: var(--r-xs);
  position: relative;
  transition: color 0.2s var(--ease);
}
.nav__link .idx { font-family: var(--font-mono); font-size: 0.72rem; color: var(--accent); margin-right: 0.3rem; }
.nav__link:hover { color: var(--text); }
.nav__link.is-active { color: var(--text); }
.nav__link.is-active::after {
  content: "";
  position: absolute;
  left: 0.8rem; right: 0.8rem; bottom: 0.2rem;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  border-radius: 2px;
}
.nav__cta { margin-left: 0.5rem; }
.nav__actions { display: flex; align-items: center; gap: 0.75rem; }

.nav__toggle {
  display: none;
  width: 44px; height: 44px;
  border-radius: var(--r-xs);
  border: 1px solid var(--border-strong);
  position: relative;
}
.nav__toggle span,
.nav__toggle span::before,
.nav__toggle span::after {
  content: "";
  position: absolute;
  left: 50%; translate: -50% 0;
  width: 20px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.3s var(--ease), opacity 0.2s var(--ease);
}
.nav__toggle span { top: 50%; translate: -50% -50%; }
.nav__toggle span::before { top: -6px; }
.nav__toggle span::after { top: 6px; }
.nav.is-open .nav__toggle span { background: transparent; }
.nav.is-open .nav__toggle span::before { transform: translateY(6px) rotate(45deg); }
.nav.is-open .nav__toggle span::after { transform: translateY(-6px) rotate(-45deg); }

/* --------------------------------- Hero --------------------------------- */
.hero {
  padding-top: clamp(2.5rem, 6vw, 5rem);
  padding-bottom: clamp(3rem, 6vw, 5.5rem);
}
.hero__grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}
/* Allow grid children to shrink below intrinsic content width (prevents overflow) */
.hero__intro, .terminal { min-width: 0; }
.hero__greeting {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 0.95rem;
  margin-bottom: 1.1rem;
}
.hero__greeting .blink { animation: blink 1.1s steps(1) infinite; }
.hero__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.7rem, 1.5rem + 6vw, 5.1rem);
  line-height: 0.98;
  letter-spacing: -0.03em;
  overflow-wrap: break-word;
}
.hero__role {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.25rem, 0.9rem + 1.8vw, 2rem);
  margin-top: 0.7rem;
  color: var(--text-soft);
}
.hero__role .grad {
  background: linear-gradient(100deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
          background-clip: text;
  color: transparent;
}
.hero__lede {
  margin-top: 1.4rem;
  max-width: 52ch;
  color: var(--text-soft);
  font-size: 1.05rem;
}
.hero__stack {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 1.6rem;
}
.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-top: 2rem;
}
.hero__socials {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 2rem;
}
.icon-btn {
  width: 42px; height: 42px;
  display: grid;
  place-items: center;
  border-radius: var(--r-xs);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-soft);
  transition: transform 0.22s var(--ease), color 0.22s var(--ease),
    border-color 0.22s var(--ease), background 0.22s var(--ease);
}
.icon-btn svg { width: 18px; height: 18px; }
.icon-btn:hover {
  transform: translateY(-3px);
  color: var(--accent);
  border-color: var(--accent-line);
  background: var(--accent-soft);
}

/* Interactive Developer Console */
.terminal {
  border-radius: var(--r-lg);
  border: 1px solid var(--border-strong);
  background: linear-gradient(180deg, var(--surface-2), var(--surface));
  box-shadow: var(--shadow), inset 0 1px 0 rgba(255, 255, 255, 0.04);
  overflow: hidden;
  font-family: var(--font-mono);
  position: relative;
  display: flex;
  flex-direction: column;
}
.terminal::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  box-shadow: 0 0 60px -10px var(--glow) inset;
  opacity: 0.5;
}
.terminal__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.1rem;
  background: rgba(255, 255, 255, 0.025);
  border-bottom: 1px solid var(--border);
}
.terminal__dots { display: flex; gap: 0.45rem; }
.terminal__dots i {
  width: 11px; height: 11px;
  border-radius: 50%;
  display: block;
  opacity: 0.9;
}
.terminal__dots i:nth-child(1) { background: #ff5f57; }
.terminal__dots i:nth-child(2) { background: #febc2e; }
.terminal__dots i:nth-child(3) { background: #28c840; }
.terminal__title {
  font-size: 0.8rem;
  color: var(--muted);
  margin-left: 0.4rem;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}
.terminal__badge {
  font-size: 0.64rem;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid var(--accent-line);
  padding: 0.08rem 0.42rem;
  border-radius: 999px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.terminal__actions { display: flex; align-items: center; gap: 0.35rem; }
.terminal__action-btn {
  width: 26px; height: 26px;
  display: grid; place-items: center;
  border-radius: 4px;
  color: var(--muted);
  background: transparent;
  border: 1px solid transparent;
  transition: all 0.2s var(--ease);
}
.terminal__action-btn svg { width: 14px; height: 14px; }
.terminal__action-btn:hover {
  color: var(--text);
  border-color: var(--border);
  background: rgba(255, 255, 255, 0.05);
}
.terminal__body {
  padding: 1.15rem 1.3rem 1.25rem;
  font-size: 0.85rem;
  line-height: 1.85;
  max-height: 310px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}
.terminal__body::-webkit-scrollbar { width: 4px; }
.terminal__body::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
.terminal__line { white-space: pre-wrap; word-break: break-word; }
.terminal__prompt { color: var(--accent); }
.terminal__prompt::before { content: "$ "; color: var(--accent-2); }
.terminal__out { color: var(--text-soft); }
.terminal__out .hl { color: var(--text); }
.terminal__out .key { color: var(--accent-2); }
.terminal .ok { color: var(--accent); }
.terminal__dynamic { margin-top: 0.6rem; }
.terminal__footer {
  border-top: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.25);
  padding: 0.6rem 0.9rem 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.terminal__chips {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.terminal__chip-label { font-size: 0.72rem; color: var(--muted); margin-right: 0.2rem; }
.t-chip {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent-2);
  background: rgba(34, 211, 238, 0.08);
  border: 1px solid rgba(34, 211, 238, 0.22);
  border-radius: 4px;
  padding: 0.15rem 0.5rem;
  transition: all 0.2s var(--ease);
}
.t-chip:hover {
  background: rgba(34, 211, 238, 0.18);
  border-color: var(--accent-2);
  transform: translateY(-1px);
}
.terminal__input-line {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-xs);
  padding: 0.35rem 0.65rem;
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}
.terminal__input-line:focus-within {
  border-color: var(--accent-line);
  box-shadow: 0 0 0 2px var(--accent-soft);
}
.terminal__input-prompt { color: var(--accent-2); font-weight: 700; font-size: 0.85rem; user-select: none; }
.terminal__input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text);
  font-size: 0.82rem;
  min-width: 0;
}
.terminal__input::placeholder { color: var(--faint); font-size: 0.76rem; }
.terminal__submit-btn {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--muted);
  padding: 0.1rem 0.4rem;
  border-radius: 3px;
  transition: color 0.2s var(--ease);
}
.terminal__submit-btn:hover { color: var(--accent); }

/* Stats */
.stats {
  margin-top: clamp(2.5rem, 5vw, 4rem);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: clamp(0.8rem, 2vw, 1.5rem);
  border-top: 1px solid var(--border);
  padding-top: clamp(1.6rem, 3vw, 2.4rem);
}
.stat__num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.7rem, 1.2rem + 2.2vw, 2.9rem);
  letter-spacing: -0.02em;
  line-height: 1;
  background: linear-gradient(135deg, var(--text), var(--accent));
  -webkit-background-clip: text;
          background-clip: text;
  color: transparent;
}
.stat__label {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--muted);
  margin-top: 0.5rem;
  letter-spacing: 0.04em;
}

/* --------------------------------- About -------------------------------- */
.about__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}
.about__lede {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.3rem, 1rem + 1.4vw, 1.85rem);
  line-height: 1.35;
  letter-spacing: -0.01em;
}
.about__body { margin-top: 1.3rem; color: var(--text-soft); }
.about__body p + p { margin-top: 1rem; }
.about__highlights {
  margin-top: 1.8rem;
  display: grid;
  gap: 0.75rem;
}
.about__highlights li {
  display: flex;
  gap: 0.75rem;
  align-items: baseline;
  color: var(--text-soft);
}
.about__highlights li::before {
  content: "▹";
  color: var(--accent);
  font-family: var(--font-mono);
  flex: none;
}

.profile-card {
  border-radius: var(--r-lg);
  border: 1px solid var(--border);
  background: var(--surface);
  padding: 1.4rem;
  box-shadow: var(--shadow);
}
.profile-card__photo {
  position: relative;
  border-radius: var(--r);
  overflow: hidden;
  aspect-ratio: 1 / 1;
  border: 1px solid var(--border);
}
.profile-card__photo img {
  width: 100%; height: 100%;
  object-fit: cover;
  filter: grayscale(0.35) contrast(1.02);
  transition: filter 0.5s var(--ease), transform 0.6s var(--ease);
}
.profile-card:hover .profile-card__photo img { filter: grayscale(0) contrast(1.05); transform: scale(1.03); }
.profile-card__photo::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 55%, rgba(10, 14, 20, 0.55));
  mix-blend-mode: multiply;
}
.profile-card__meta {
  margin-top: 1.1rem;
  display: grid;
  gap: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
}
.profile-card__meta div { display: flex; justify-content: space-between; gap: 1rem; }
.profile-card__meta dt { color: var(--muted); }
.profile-card__meta dd { color: var(--text); text-align: right; }
.status-dot {
  display: inline-flex; align-items: center; gap: 0.45rem;
  color: var(--accent);
}
.status-dot::before {
  content: ""; width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 0 var(--accent);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(52, 211, 153, 0.5); }
  70% { box-shadow: 0 0 0 7px rgba(52, 211, 153, 0); }
  100% { box-shadow: 0 0 0 0 rgba(52, 211, 153, 0); }
}
.profile-card__action {
  margin-top: 1.25rem;
}
.profile-card__action .btn {
  font-size: 0.88rem;
  padding: 0.65rem 1rem;
}

/* --------------------------------- Skills ------------------------------- */
.skills__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(248px, 1fr));
  gap: 1.1rem;
}
.skill-group {
  border: 1px solid var(--border);
  border-radius: var(--r);
  background: var(--surface);
  padding: 1.4rem 1.4rem 1.5rem;
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}
.skill-group:hover { border-color: var(--border-strong); transform: translateY(-3px); }
.skill-group__head {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  margin-bottom: 1.1rem;
}
.skill-group__icon {
  width: 38px; height: 38px;
  display: grid; place-items: center;
  border-radius: var(--r-xs);
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid var(--accent-line);
}
.skill-group__icon svg { width: 19px; height: 19px; }
.skill-group__title { font-weight: 600; font-size: 1.02rem; }
.skill-group__list { display: flex; flex-wrap: wrap; gap: 0.5rem; }

/* ------------------------------- Experience ----------------------------- */
.timeline { position: relative; }
.timeline::before {
  content: "";
  position: absolute;
  left: 7px; top: 6px; bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--accent-line), var(--border) 60%, transparent);
}
.tl-item {
  position: relative;
  padding-left: 2.6rem;
  padding-bottom: 2.4rem;
}
.tl-item:last-child { padding-bottom: 0; }
.tl-item::before {
  content: "";
  position: absolute;
  left: 0; top: 4px;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
  box-shadow: 0 0 0 4px rgba(52, 211, 153, 0.1);
}
.tl-item--current::before { background: var(--accent); }
.tl-item__date {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent);
  letter-spacing: 0.03em;
}
.tl-item__role {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.22rem;
  margin-top: 0.35rem;
}
.tl-item__company {
  color: var(--text-soft);
  font-weight: 500;
  margin-top: 0.1rem;
}
.tl-item__company .badge {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--accent-line);
  background: var(--accent-soft);
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  margin-left: 0.5rem;
  vertical-align: middle;
}
.tl-item__desc { margin-top: 0.7rem; color: var(--text-soft); max-width: 66ch; }
.tl-item__tags { display: flex; flex-wrap: wrap; gap: 0.45rem; margin-top: 0.9rem; }

/* -------------------------------- Projects ------------------------------ */
.filters-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2.2rem;
}
.filters-row .filters {
  margin-bottom: 0;
}
.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.filter-counter {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--muted);
  letter-spacing: 0.04em;
}
.filter {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-soft);
  padding: 0.5rem 0.95rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease), transform 0.2s var(--ease);
}
.filter:hover { color: var(--accent); border-color: var(--accent-line); transform: translateY(-1px); }
.filter.is-active {
  color: var(--accent-ink);
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border-color: transparent;
  font-weight: 600;
  box-shadow: 0 4px 14px -4px var(--glow);
}
.filter .count { opacity: 0.7; margin-left: 0.3rem; }

.projects {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(330px, 1fr));
  gap: 1.25rem;
}
.project {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border);
  border-radius: var(--r);
  background: linear-gradient(180deg, var(--surface), var(--bg-soft));
  padding: 1.5rem 1.5rem 1.6rem;
  position: relative;
  overflow: hidden;
  transition: transform 0.35s var(--ease), border-color 0.35s var(--ease), box-shadow 0.35s var(--ease);
  animation: cardIn 0.5s var(--ease) both;
}
.project::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s var(--ease);
  z-index: 2;
}
.project::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(400px circle at var(--mouse-x, 50%) var(--mouse-y, 50%), rgba(52, 211, 153, 0.08), transparent 60%);
  opacity: 0;
  transition: opacity 0.3s var(--ease);
  pointer-events: none;
  z-index: 1;
}
.project:hover {
  transform: translateY(-5px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow);
}
.project:hover::before { transform: scaleX(1); }
.project:hover::after { opacity: 1; }
.project.is-hidden { display: none; }
@keyframes cardIn {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: translateY(0); }
}

.project__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  margin-bottom: 1rem;
  position: relative;
  z-index: 2;
}
.project__meta-badges {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}
.proj-badge {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-soft);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  padding: 0.16rem 0.52rem;
  border-radius: 999px;
  white-space: nowrap;
}
.proj-badge--oss {
  color: var(--accent);
  background: var(--accent-soft);
  border-color: var(--accent-line);
}
.project__icon {
  width: 44px; height: 44px;
  border-radius: var(--r-xs);
  display: grid; place-items: center;
  background: var(--accent-soft);
  border: 1px solid var(--accent-line);
  color: var(--accent);
  flex-shrink: 0;
}
.project__icon svg { width: 22px; height: 22px; }
.project__featured {
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  white-space: nowrap;
}
.project__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  line-height: 1.2;
}
.project__stack {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--accent-2);
  margin-top: 0.4rem;
}
.project__desc { color: var(--text-soft); font-size: 0.94rem; margin-top: 0.85rem; }
.project__features {
  margin-top: 0.95rem;
  display: grid;
  gap: 0.45rem;
}
.project__features li {
  display: flex; gap: 0.5rem;
  font-size: 0.86rem;
  color: var(--text-soft);
}
.project__features li::before { content: "▸"; color: var(--accent); flex: none; }
.project__tags {
  display: flex; flex-wrap: wrap; gap: 0.4rem;
  margin-top: auto;
  padding-top: 1.1rem;
}
.project__tags .tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.18rem 0.5rem;
}
.project__links { display: flex; gap: 0.8rem; margin-top: 1rem; }
.project__links a {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: gap 0.2s var(--ease);
}
.project__links a:hover { gap: 0.6rem; }
.project__links svg { width: 14px; height: 14px; }

/* ---------------------- Beyond code (3-up panels) ----------------------- */
.beyond {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
}
.panel {
  border: 1px solid var(--border);
  border-radius: var(--r);
  background: var(--surface);
  padding: 1.6rem 1.5rem;
}
.panel__head {
  display: flex; align-items: center; gap: 0.7rem;
  margin-bottom: 1.3rem;
}
.panel__head svg { width: 20px; height: 20px; color: var(--accent); }
.panel__title { font-family: var(--font-display); font-weight: 700; font-size: 1.15rem; }

.award { display: flex; gap: 0.85rem; padding-block: 0.7rem; }
.award + .award { border-top: 1px solid var(--border); }
.award__medal { font-size: 1.3rem; flex: none; line-height: 1.4; }
.award__title { font-weight: 600; font-size: 0.95rem; }
.award__meta { color: var(--muted); font-size: 0.82rem; margin-top: 0.15rem; }

.edu { padding-block: 0.7rem; }
.edu + .edu { border-top: 1px solid var(--border); }
.edu__date { font-family: var(--font-mono); font-size: 0.76rem; color: var(--accent); }
.edu__title { font-weight: 600; margin-top: 0.25rem; }
.edu__org { color: var(--text-soft); font-size: 0.9rem; }
.edu__grade { font-family: var(--font-mono); color: var(--muted); font-size: 0.8rem; margin-top: 0.2rem; }

.research { padding-block: 0.7rem; }
.research + .research { border-top: 1px solid var(--border); }
.research__title { font-weight: 600; font-size: 0.95rem; }
.research__meta { color: var(--muted); font-size: 0.82rem; margin-top: 0.2rem; }
.interests { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 0.4rem; }

/* -------------------------------- Contact ------------------------------- */
.contact__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: start;
}
.form-card,
.contact-aside {
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background: var(--surface);
  padding: clamp(1.5rem, 3vw, 2.2rem);
}
.field { margin-bottom: 1.1rem; }
.field__label-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.field label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.05em;
  color: var(--muted);
  margin-bottom: 0.5rem;
}
.field__label-row label { margin-bottom: 0; }
.field label .req { color: var(--accent); }
.msg-starters {
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
}
.starter-chip {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--muted);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.14rem 0.45rem;
  transition: all 0.2s var(--ease);
}
.starter-chip:hover {
  color: var(--accent);
  border-color: var(--accent-line);
  background: var(--accent-soft);
  transform: translateY(-1px);
}
.input {
  width: 100%;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--r-xs);
  padding: 0.85rem 1rem;
  color: var(--text);
  font-size: 0.96rem;
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease), background 0.2s var(--ease);
}
.input::placeholder { color: var(--faint); }
.input:focus {
  outline: none;
  border-color: var(--accent-line);
  box-shadow: 0 0 0 3px var(--accent-soft);
  background: var(--surface);
}
textarea.input { resize: vertical; min-height: 140px; }
.honeypot { position: absolute; left: -9999px; opacity: 0; height: 0; overflow: hidden; }

.form-status {
  margin-top: 1rem;
  font-size: 0.86rem;
  font-family: var(--font-mono);
  min-height: 1.2em;
  border-radius: var(--r-xs);
  transition: all 0.2s var(--ease);
}
.form-status:not(:empty) {
  padding: 0.6rem 0.8rem;
}
.form-status.is-ok {
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid var(--accent-line);
}
.form-status.is-err {
  color: #ff9090;
  background: rgba(255, 110, 110, 0.1);
  border: 1px solid rgba(255, 110, 110, 0.3);
}

.contact-aside__title { font-family: var(--font-display); font-weight: 700; font-size: 1.2rem; margin-bottom: 1.3rem; }
.contact-line {
  display: flex;
  gap: 0.9rem;
  align-items: center;
  padding-block: 0.85rem;
}
.contact-line + .contact-line { border-top: 1px solid var(--border); }
.contact-line__icon {
  width: 40px; height: 40px; flex: none;
  display: grid; place-items: center;
  border-radius: var(--r-xs);
  background: var(--accent-soft);
  border: 1px solid var(--accent-line);
  color: var(--accent);
}
.contact-line__icon svg { width: 18px; height: 18px; }
.contact-line__content {
  flex: 1;
  min-width: 0;
}
.contact-line__label { font-family: var(--font-mono); font-size: 0.72rem; color: var(--muted); letter-spacing: 0.04em; }
.contact-line__row {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-top: 0.15rem;
}
.contact-line__value { color: var(--text); font-weight: 500; word-break: break-word; font-size: 0.95rem; }
.contact-line a.contact-line__value:hover { color: var(--accent); }
.copy-btn {
  width: 28px; height: 28px;
  display: grid; place-items: center;
  border-radius: 4px;
  color: var(--muted);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  position: relative;
  transition: all 0.2s var(--ease);
  flex-shrink: 0;
}
.copy-btn svg { width: 13px; height: 13px; }
.copy-btn:hover {
  color: var(--accent);
  border-color: var(--accent-line);
  background: var(--accent-soft);
  transform: translateY(-1px);
}
.copy-btn.is-copied {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-soft);
}
.contact-aside__socials { display: flex; flex-wrap: wrap; gap: 0.55rem; margin-top: 1.5rem; }

/* Accessible Tooltips */
[data-tooltip] {
  position: relative;
}
[data-tooltip]::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 7px);
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  background: #141b29;
  border: 1px solid var(--border-strong);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.22rem 0.55rem;
  border-radius: 4px;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s var(--ease), transform 0.2s var(--ease), visibility 0.2s;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}
[data-tooltip]:hover::after,
[data-tooltip]:focus-visible::after {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

body.menu-open {
  overflow: hidden;
}

/* --------------------------------- Footer ------------------------------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding-block: 2.5rem;
  margin-top: 2rem;
}
.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
}
.site-footer__brand { font-family: var(--font-mono); font-weight: 700; }
.site-footer__brand .tilde { color: var(--accent); }
.site-footer p { color: var(--muted); font-size: 0.86rem; font-family: var(--font-mono); }
.site-footer a { color: var(--text-soft); }
.site-footer a:hover { color: var(--accent); }

/* ------------------------------- To-top --------------------------------- */
.to-top {
  position: fixed;
  right: clamp(1rem, 3vw, 2rem);
  bottom: clamp(1rem, 3vw, 2rem);
  width: 46px; height: 46px;
  border-radius: 50%;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: var(--accent-ink);
  box-shadow: 0 12px 28px -12px var(--glow);
  z-index: 90;
  opacity: 0;
  transform: translateY(16px) scale(0.9);
  pointer-events: none;
  transition: opacity 0.3s var(--ease), transform 0.3s var(--ease);
}
.to-top.is-visible { opacity: 1; transform: none; pointer-events: auto; }
.to-top:hover { transform: translateY(-3px); }
.to-top svg { width: 20px; height: 20px; }

/* ------------------------------ Reveal anim ----------------------------- */
/* Content is visible by default; the hidden-then-reveal effect only applies
   when JS is active (html.js), so the page is never blank without JS. */
.js .reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
  transition-delay: var(--d, 0ms);
}
.js .reveal.is-in { opacity: 1; transform: none; }

/* Hero entrance */
.hero .anim {
  opacity: 0;
  animation: fadeUp 0.8s var(--ease) forwards;
  animation-delay: var(--d, 0ms);
}
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(22px); }
  to { opacity: 1; transform: none; }
}

/* ------------------------------ Responsive ------------------------------ */
@media (max-width: 980px) {
  .hero__grid { grid-template-columns: 1fr; }
  .terminal { order: -1; max-width: 520px; }
  .about__grid { grid-template-columns: 1fr; }
  .profile-card { max-width: 420px; }
  .contact__grid { grid-template-columns: 1fr; }
}

@media (max-width: 860px) {
  .nav__links {
    position: fixed;
    inset: var(--nav-h) 0 auto 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0.2rem;
    background: rgba(10, 14, 20, 0.97);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    padding: 1rem var(--gutter) 1.5rem;
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.28s var(--ease), transform 0.28s var(--ease), visibility 0.28s;
    box-shadow: var(--shadow);
  }
  .nav.is-open .nav__links { opacity: 1; visibility: visible; transform: none; }
  .nav__link { padding: 0.85rem 0.5rem; font-size: 1.05rem; border-bottom: 1px solid var(--border); }
  .nav__link.is-active::after { display: none; }
  .nav__link.is-active { color: var(--accent); }
  .nav__cta { margin: 0.8rem 0 0; }
  .nav__cta .btn { width: 100%; justify-content: center; }
  .nav__toggle { display: block; }
}

@media (max-width: 620px) {
  .hero__name { font-size: clamp(1.9rem, 1.1rem + 4vw, 2.8rem); }
  .hero__role { font-size: clamp(1.15rem, 0.9rem + 1.6vw, 1.6rem); }
  .stats { grid-template-columns: repeat(2, 1fr); gap: 1.4rem 1rem; }
  .hero__cta { flex-direction: column; align-items: stretch; }
  .hero__cta .btn { justify-content: center; }
  .projects { grid-template-columns: 1fr; }
  .section-head__sub { font-size: 0.95rem; }
  .terminal__body { font-size: 0.78rem; }
}

@media (max-width: 400px) {
  :root { --gutter: 1rem; }
  .stats { grid-template-columns: 1fr 1fr; }
  .terminal__body { padding: 1.1rem 1.1rem 1.3rem; font-size: 0.72rem; line-height: 1.85; }
  .terminal__title { font-size: 0.72rem; }
}

/* --------------------------- Reduced motion ----------------------------- */
@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;
  }
  .reveal, .js .reveal { opacity: 1; transform: none; }
  .hero .anim { opacity: 1; }
}

/* --------------------------- Print (resume) ----------------------------- */
@media print {
  body { background: #fff; color: #000; }
  .nav, .to-top, .grain, .hero__cta, .filters, .contact__grid, .site-footer { display: none !important; }
  body::before, body::after { display: none; }
}