/* ==========================================================================
   Vitor Botelho — Portfolio
   Design system: "Collider Event Display" (see /DESIGN.md at repo root)
   Every token below traces to a named role in DESIGN.md. Do not add a new
   accent color here without updating DESIGN.md first.
   ========================================================================== */

:root {
  /* --- Colors (DESIGN.md > Colors) --- */
  --vacuum: #080e12;
  --vacuum-raised: #0c141a;
  --detector-steel: #24364a;
  --detector-ring: #3c5b66;
  --track-yellow: #ffd23a;
  --track-cyan: #21b7ff;
  --calorimeter-red: #ff3b3b;
  --text-light: #e6e9ee;
  --text-muted: rgba(230, 233, 238, 0.68);
  --text-faint: rgba(230, 233, 238, 0.42);

  /* --- Typography (DESIGN.md > Typography) --- */
  --font-display: "Orbitron", "Space Grotesk", sans-serif;
  --font-label: "Rajdhani", "Space Grotesk", sans-serif;
  --font-body: "Inter", system-ui, -apple-system, sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;

  /* --- Layout --- */
  --measure: 68ch;
  --container: 1180px;
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --ring-radius: 3px;

  /* --- Motion --- */
  --ease-standard: cubic-bezier(0.4, 0, 0.2, 1);
  --dur-fast: 180ms;
  --dur-med: 420ms;
  --dur-slow: 900ms;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@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; }
}
body {
  margin: 0;
  background: var(--vacuum);
  color: var(--text-light);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, p { margin: 0; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }

/* Base vacuum texture: extremely faint grid-dot field, echoing the world's
   "grid dot" material swatch. Kept under 4% opacity so it never competes
   with the tracks. */
body {
  background-image:
    radial-gradient(circle at 1px 1px, rgba(230, 233, 238, 0.05) 1px, transparent 0);
  background-size: 28px 28px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--track-yellow);
  color: var(--vacuum);
  padding: 0.6em 1em;
  font-family: var(--font-label);
  font-weight: 600;
  z-index: 999;
}
.skip-link:focus {
  left: var(--gutter);
  top: 1rem;
}

:focus-visible {
  outline: 2px solid var(--track-yellow);
  outline-offset: 3px;
}

/* ---------- Layout helpers ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.section {
  position: relative;
  padding-block: clamp(4rem, 9vw, 7rem);
  border-top: 1px solid var(--detector-steel);
}
.section--tight { padding-block: clamp(2.5rem, 6vw, 4rem); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
  font-family: var(--font-label);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1rem;
}
.eyebrow::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--track-yellow);
  box-shadow: 0 0 8px 2px rgba(255, 210, 58, 0.55);
}
.eyebrow[data-track="cyan"]::before {
  background: var(--track-cyan);
  box-shadow: 0 0 8px 2px rgba(33, 183, 255, 0.55);
}

.section-title {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.01em;
  font-size: clamp(1.7rem, 3.4vw, 2.4rem);
  line-height: 1.15;
  margin-bottom: 1.25rem;
  text-transform: uppercase;
}

.section-lede {
  max-width: var(--measure);
  color: var(--text-muted);
  font-size: 1.02rem;
}

.mono { font-family: var(--font-mono); }

/* ---------- Ring/arc iconography ---------- */
.ring-icon {
  display: inline-block;
  border-radius: 50%;
  border: 1.5px solid currentColor;
  position: relative;
}
.ring-icon::after {
  content: "";
  position: absolute;
  inset: 30%;
  border-radius: 50%;
  background: currentColor;
}

/* ==========================================================================
   Header / Nav
   ========================================================================== */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  background: rgba(8, 14, 18, 0.82);
  backdrop-filter: blur(10px) saturate(1.1);
  border-bottom: 1px solid var(--detector-steel);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.nav-mark {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-light);
  letter-spacing: 0.04em;
}
.nav-mark .ring-icon {
  width: 20px;
  height: 20px;
  color: var(--track-yellow);
}
.nav-mark strong {
  font-family: var(--font-label);
  font-weight: 600;
  letter-spacing: 0.06em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}
.nav-links a {
  font-family: var(--font-label);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  padding: 0.4rem 0;
  border-bottom: 2px solid transparent;
  transition: color var(--dur-fast) var(--ease-standard), border-color var(--dur-fast) var(--ease-standard);
}
.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--track-yellow);
  border-color: var(--track-yellow);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Language toggle: physical two-position switch */
.lang-toggle {
  position: relative;
  display: inline-flex;
  align-items: center;
  width: 84px;
  height: 32px;
  border: 1px solid var(--detector-steel);
  border-radius: 16px;
  background: var(--vacuum-raised);
  padding: 3px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.05em;
}
.lang-toggle__labels {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-inline: 9px;
  pointer-events: none;
  color: var(--text-faint);
}
.lang-toggle__labels span[data-active="true"] { color: var(--vacuum); }
.lang-toggle__thumb {
  position: relative;
  width: 38px;
  height: 24px;
  border-radius: 12px;
  background: var(--track-yellow);
  box-shadow: 0 0 10px rgba(255, 210, 58, 0.4);
  transition: transform var(--dur-med) var(--ease-standard);
  z-index: 1;
}
html[lang="en"] .lang-toggle__thumb { transform: translateX(38px); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  font-family: var(--font-label);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.85em 1.4em;
  border-radius: 3px;
  border: 1px solid var(--track-cyan);
  color: var(--track-cyan);
  transition: background var(--dur-fast) var(--ease-standard), color var(--dur-fast) var(--ease-standard), transform var(--dur-fast) var(--ease-standard);
}
.btn:hover, .btn:focus-visible { background: rgba(33, 183, 255, 0.12); transform: translateY(-1px); }
.btn--primary {
  border-color: var(--track-yellow);
  color: var(--vacuum);
  background: var(--track-yellow);
}
.btn--primary:hover, .btn--primary:focus-visible {
  background: #ffe066;
  box-shadow: 0 0 22px rgba(255, 210, 58, 0.35);
}
.btn--ghost {
  border-color: var(--detector-steel);
  color: var(--text-muted);
}
.btn--ghost:hover, .btn--ghost:focus-visible { color: var(--text-light); border-color: var(--text-muted); background: transparent; }

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--detector-steel);
  border-radius: 3px;
}
.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text-light);
  position: relative;
  transition: transform var(--dur-fast) var(--ease-standard), opacity var(--dur-fast) var(--ease-standard);
}
.nav-toggle span::before { position: absolute; top: -6px; }
.nav-toggle span::after { position: absolute; top: 6px; }

/* ==========================================================================
   Hero — Event Display
   ========================================================================== */
.hero {
  position: relative;
  padding-top: clamp(7rem, 14vw, 10rem);
  padding-bottom: clamp(4rem, 8vw, 6rem);
  overflow: hidden;
}
.hero__rings {
  position: absolute;
  top: 50%;
  right: -6%;
  transform: translateY(-50%);
  width: min(64vw, 780px);
  opacity: 0.9;
  pointer-events: none;
}
.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
  position: relative;
}
.hero__id {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-faint);
  letter-spacing: 0.08em;
  margin-bottom: 1.4rem;
  display: block;
}

.hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.3rem, 5.4vw, 4rem);
  line-height: 1.05;
  text-transform: uppercase;
  letter-spacing: 0.005em;
  margin-bottom: 1.4rem;
  /* Safety net for very narrow viewports (<300px): the display font's
     minimum clamp size can make a single word like "AUTOMAÇÃO" wider
     than the column, and it has no natural break point otherwise. */
  overflow-wrap: break-word;
}
.hero__title .accent { color: var(--track-yellow); }
.hero__title .accent--cyan { color: var(--track-cyan); }

.hero__lede {
  max-width: 46ch;
  font-size: 1.08rem;
  color: var(--text-muted);
  margin-bottom: 2.2rem;
}

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 3rem;
}

/* Calorimeter readout strip */
.readout-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  background: var(--detector-steel);
  border: 1px solid var(--detector-steel);
  border-radius: 4px;
  overflow: hidden;
}
.readout-strip__item {
  background: var(--vacuum-raised);
  padding: 0.9rem 0.6rem;
  text-align: left;
}
.readout-strip__bar {
  height: 3px;
  background: var(--calorimeter-red);
  margin-bottom: 0.6rem;
  border-radius: 2px;
  box-shadow: 0 0 6px rgba(255, 59, 59, 0.55);
}
.readout-strip__value {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  color: var(--calorimeter-red);
  display: block;
  line-height: 1;
  margin-bottom: 0.35rem;
}
.readout-strip__label {
  font-family: var(--font-label);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-faint);
}

/* Track visualization */
.event-display {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  max-width: 560px;
  margin-inline: auto;
}
.event-display svg { width: 100%; height: 100%; overflow: visible; }
.event-display__ring { fill: none; stroke: var(--detector-ring); stroke-width: 1; opacity: 0.45; }
.event-display__center {
  fill: var(--vacuum-raised);
  stroke: var(--text-light);
  stroke-width: 1.5;
}
.event-display__center-dot { fill: var(--text-light); }
.track-path {
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-dasharray: 620;
  stroke-dashoffset: 620;
  animation: draw-track 1.6s var(--ease-standard) forwards;
}
.track-path--yellow { stroke: var(--track-yellow); filter: drop-shadow(0 0 6px rgba(255, 210, 58, 0.65)); }
.track-path--cyan { stroke: var(--track-cyan); filter: drop-shadow(0 0 6px rgba(33, 183, 255, 0.65)); animation-delay: 0.25s; }
@keyframes draw-track { to { stroke-dashoffset: 0; } }
@media (prefers-reduced-motion: reduce) {
  .track-path { animation: none; stroke-dashoffset: 0; }
}

.event-tags {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.event-tag {
  position: absolute;
  pointer-events: auto;
  display: inline-flex;
  flex-direction: column;
  gap: 0.15rem;
  padding: 0.5rem 0.7rem;
  background: rgba(12, 20, 26, 0.92);
  border: 1px solid var(--detector-steel);
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  white-space: normal;
  /* Sized relative to .event-display (its positioning parent) instead of a
     fixed px value: two tags anchored at opposite edges (see --1/--4 etc.)
     must never sum past the container width or they collide in the middle,
     which happened at every width from ~600px up to the desktop ceiling. */
  max-width: clamp(110px, 30%, 170px);
  animation: tag-in var(--dur-med) var(--ease-standard) backwards;
}
@keyframes tag-in { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: translateY(0); } }
.event-tag__label { color: var(--text-faint); font-family: var(--font-label); font-size: 0.62rem; letter-spacing: 0.08em; text-transform: uppercase; }
.event-tag__value { color: var(--text-light); font-size: 0.74rem; }
.event-tag--yellow { border-color: rgba(255, 210, 58, 0.45); }
.event-tag--cyan { border-color: rgba(33, 183, 255, 0.45); }

/* Left trio sits on the yellow (FinOps/automation) tracks; right trio on the
   cyan (independent product) tracks. These top/left/right percentages are
   the exact SVG track endpoints (see the <path> coordinates above, same
   0-400 viewBox converted to %), spaced so no box's footprint sits in the
   path of a *different* track — each tag's near corner (top-left for the
   left trio, top-right for the right trio) lands exactly on its own
   track's tip and nothing else crosses behind it. */
.event-tag--1 { top: 42.40%; left: 6.91%; animation-delay: .5s; }
.event-tag--2 { top: 78.12%; left: 16.49%; animation-delay: .7s; }
.event-tag--3 { top: 21.88%; left: 16.49%; animation-delay: .9s; }
/* Right trio anchors from the right edge (not left) so long labels grow
   inward and never overflow the viewport on narrow screens. */
.event-tag--4 { top: 21.88%; right: 16.49%; animation-delay: .6s; text-align: right; }
.event-tag--5 { top: 42.40%; right: 6.91%; animation-delay: .8s; text-align: right; }
.event-tag--6 { top: 78.12%; right: 16.49%; animation-delay: 1s; text-align: right; }

@media (max-width: 980px) {
  /* minmax(0, 1fr), not a bare 1fr: a bare fr track's automatic minimum
     is its content's min-content size, which on very narrow phones is
     wider than the viewport and forces the whole column (and everything
     in it) to overflow horizontally. minmax(0, 1fr) lets it shrink. */
  .hero__grid { grid-template-columns: minmax(0, 1fr); }
  .event-display {
    max-width: 420px;
    margin-top: 2rem;
    /* aspect-ratio on the wrapper + position:absolute tags (desktop) keeps
       the box square; once tags become in-flow below the SVG, a square
       wrapper makes some mobile browsers skip growing for the grid — the
       tags paint past the hero and #about overlaps them. Square belongs
       on the SVG only in this breakpoint. */
    aspect-ratio: auto;
  }
  .event-display svg {
    aspect-ratio: 1 / 1;
    height: auto;
  }
  /* Stacked hero: overlay tags no longer match the tighter track geometry
     and they don't contribute to document height when absolute — list them
     under the diagram so the hero always reserves space before #about. */
  .event-tags {
    position: static;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.6rem;
    margin-top: 1.5rem;
  }
  .event-tag {
    position: static;
    max-width: none;
    text-align: left;
    font-size: 0.68rem;
    padding: 0.5rem 0.7rem;
  }
}

/* ==========================================================================
   About
   ========================================================================== */
.about__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}
/* Below ~700px the 1fr facts column gets squeezed under ~180px, which
   forces .fact-row's dd (e.g. "Senior Platform Engineer") past its own
   row and off the right edge of the viewport. Stack instead. */
@media (max-width: 700px) {
  .about__grid { grid-template-columns: minmax(0, 1fr); }
}
.about__bio p + p { margin-top: 1.1rem; }
.about__bio { color: var(--text-muted); max-width: var(--measure); }
.about__facts {
  border: 1px solid var(--detector-steel);
  border-radius: 4px;
  padding: 1.5rem;
  background: var(--vacuum-raised);
}
.fact-row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--detector-steel);
  font-size: 0.85rem;
}
.fact-row:last-child { border-bottom: none; }
.fact-row dt {
  font-family: var(--font-label);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-size: 0.68rem;
  color: var(--text-faint);
}
.fact-row dd { margin: 0; font-family: var(--font-mono); color: var(--text-light); text-align: right; }
.lang-bars { margin-top: 1.2rem; display: flex; flex-direction: column; gap: 0.6rem; }
.lang-bar__head { display: flex; justify-content: space-between; font-size: 0.72rem; font-family: var(--font-label); letter-spacing: 0.04em; color: var(--text-muted); margin-bottom: 0.3rem; }
.lang-bar__track { height: 4px; background: var(--detector-steel); border-radius: 2px; overflow: hidden; }
.lang-bar__fill { height: 100%; background: var(--track-cyan); border-radius: 2px; }

/* ==========================================================================
   Experience timeline
   ========================================================================== */
.timeline { position: relative; padding-left: clamp(1.5rem, 3vw, 2.5rem); }
.timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(to bottom, var(--track-yellow), rgba(255, 210, 58, 0.15));
}
.timeline[data-track="cyan"]::before {
  background: linear-gradient(to bottom, var(--track-cyan), rgba(33, 183, 255, 0.15));
}
.timeline-item { position: relative; padding-bottom: clamp(2rem, 4vw, 3rem); }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
  content: "";
  position: absolute;
  left: calc(-1 * clamp(1.5rem, 3vw, 2.5rem) - 5px);
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--vacuum);
  border: 2px solid var(--track-yellow);
}
.timeline[data-track="cyan"] .timeline-item::before { border-color: var(--track-cyan); }
.timeline-item__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.75rem;
  margin-bottom: 0.4rem;
}
.timeline-item__role {
  font-family: var(--font-label);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
}
.timeline-item__org { color: var(--track-yellow); }
.timeline[data-track="cyan"] .timeline-item__org { color: var(--track-cyan); }
.timeline-item__meta {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-faint);
}
.timeline-item__bullets { margin-top: 0.7rem; display: flex; flex-direction: column; gap: 0.45rem; max-width: var(--measure); }
.timeline-item__bullets li { position: relative; padding-left: 1.1rem; color: var(--text-muted); font-size: 0.94rem; }
.timeline-item__bullets li::before { content: "›"; position: absolute; left: 0; color: var(--track-yellow); font-family: var(--font-mono); }
.timeline[data-track="cyan"] .timeline-item__bullets li::before { color: var(--track-cyan); }

/* ==========================================================================
   Projects
   ========================================================================== */
.project-grid {
  display: grid;
  /* min(280px, 100%) instead of a bare 280px: on viewports narrower than
     ~320px, a hard 280px minimum is wider than the available column and
     forces horizontal overflow. */
  grid-template-columns: repeat(auto-fit, minmax(min(280px, 100%), 1fr));
  gap: 1.25rem;
}
.project-card {
  position: relative;
  border: 1px solid var(--detector-steel);
  border-radius: 4px;
  background: var(--vacuum-raised);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  transition: border-color var(--dur-fast) var(--ease-standard), transform var(--dur-fast) var(--ease-standard);
}
.project-card:hover, .project-card:focus-within {
  border-color: var(--track-cyan);
  transform: translateY(-3px);
}
.project-card__head { display: flex; justify-content: space-between; align-items: flex-start; gap: 0.5rem; }
.project-card__name {
  font-family: var(--font-label);
  font-weight: 600;
  font-size: 1.08rem;
  letter-spacing: 0.01em;
}
.project-card__role {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--track-cyan);
  border: 1px solid rgba(33, 183, 255, 0.4);
  border-radius: 999px;
  padding: 0.15rem 0.55rem;
  margin-top: 0.4rem;
}
.project-card__stars {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--calorimeter-red);
  white-space: nowrap;
}
.project-card__desc { color: var(--text-muted); font-size: 0.92rem; flex-grow: 1; }
.project-card__desc[data-pending="true"] { color: var(--text-faint); font-style: italic; }
.project-card__stack { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.tag-chip {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  padding: 0.2rem 0.55rem;
  border: 1px solid var(--detector-steel);
  border-radius: 3px;
  color: var(--text-muted);
}
.project-card__link {
  margin-top: auto;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-label);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--track-cyan);
}
.project-card__link svg { width: 14px; height: 14px; }

/* ==========================================================================
   Skills & Certifications
   ========================================================================== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}
.skill-group__title {
  font-family: var(--font-label);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--track-yellow);
  margin-bottom: 0.75rem;
}
.skill-group__list { display: flex; flex-wrap: wrap; gap: 0.5rem; }

.cert-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(260px, 100%), 1fr));
  gap: 0.75rem;
}
.cert-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--detector-steel);
  border-radius: 3px;
  background: var(--vacuum-raised);
  font-size: 0.88rem;
}
.cert-item__mark {
  flex-shrink: 0;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 1.5px solid var(--calorimeter-red);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--calorimeter-red);
  font-family: var(--font-mono);
  font-size: 0.7rem;
}

.edu-list { display: flex; flex-direction: column; gap: 1rem; margin-top: 2.5rem; }
.edu-item { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; padding-bottom: 1rem; border-bottom: 1px solid var(--detector-steel); }
.edu-item:last-child { border-bottom: none; padding-bottom: 0; }
.edu-item__degree { font-family: var(--font-label); font-weight: 600; font-size: 0.95rem; }
.edu-item__org { color: var(--text-muted); font-size: 0.85rem; }
.edu-item__meta { font-family: var(--font-mono); font-size: 0.78rem; color: var(--text-faint); white-space: nowrap; }

/* ==========================================================================
   Contact
   ========================================================================== */
.contact {
  text-align: left;
}
.contact__panel {
  border: 1px solid var(--detector-steel);
  border-radius: 6px;
  background: var(--vacuum-raised);
  padding: clamp(2rem, 5vw, 3.5rem);
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: clamp(2rem, 4vw, 3rem);
  align-items: center;
}
.contact__title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  text-transform: uppercase;
  margin-bottom: 1rem;
}
.contact__lede { color: var(--text-muted); max-width: 42ch; margin-bottom: 1.75rem; }
.contact__actions { display: flex; flex-wrap: wrap; gap: 1rem; }
.contact__channels { display: flex; flex-direction: column; gap: 0.75rem; }
.channel {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--detector-steel);
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  transition: border-color var(--dur-fast) var(--ease-standard), color var(--dur-fast) var(--ease-standard);
}
.channel:hover, .channel:focus-visible { border-color: var(--track-cyan); color: var(--track-cyan); }
.channel .ring-icon { width: 16px; height: 16px; color: var(--track-yellow); flex-shrink: 0; }

@media (max-width: 860px) {
  /* minmax(0, 1fr): see the .hero__grid comment above — a bare 1fr keeps
     an auto (content-based) minimum that overflows on narrow phones. */
  .contact__panel { grid-template-columns: minmax(0, 1fr); }
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  border-top: 1px solid var(--detector-steel);
  padding-block: 2rem;
}
.footer__row {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-faint);
}
.footer__socials { display: flex; gap: 1rem; }
.footer__socials a { color: var(--text-faint); transition: color var(--dur-fast) var(--ease-standard); }
.footer__socials a:hover, .footer__socials a:focus-visible { color: var(--track-cyan); }

/* ==========================================================================
   Reveal-on-scroll
   ========================================================================== */
[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--dur-slow) var(--ease-standard), transform var(--dur-slow) var(--ease-standard);
}
[data-reveal].is-visible { opacity: 1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; transition: none; }
}

/* ==========================================================================
   Responsive nav (mobile)
   ========================================================================== */
@media (max-width: 860px) {
  .nav-toggle { display: flex; }
  .nav-links {
    position: fixed;
    inset: 64px 0 auto 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: var(--vacuum);
    border-bottom: 1px solid var(--detector-steel);
    padding: 1rem var(--gutter) 1.5rem;
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--dur-med) var(--ease-standard), transform var(--dur-med) var(--ease-standard), visibility var(--dur-med);
  }
  .nav-links a { width: 100%; padding: 0.85rem 0; border-bottom: 1px solid var(--detector-steel); }
  body.nav-open .nav-links { transform: translateY(0); opacity: 1; visibility: visible; }
  .nav-actions .btn--ghost { display: none; }
}

@media (max-width: 600px) {
  .readout-strip { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .event-display { max-width: 260px; margin-inline: auto; }
}