/* ---------- reset + tokens ---------- */

*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
img, svg { display: block; max-width: 100%; }
button { font: inherit; }

:root {
  /* Signal-orange-adjacent accent — the ✦ in their wordmark */
  --accent: #ff6b35;
  --accent-soft: #ff8a5c;

  /* Dark-mode default (Signal engineers live here) */
  --bg: #0e0f12;
  --bg-elev: #16181d;
  --bg-elev-2: #1d2027;
  --border: #2a2e36;
  --border-soft: #1f232b;
  --fg: #ecedef;
  --fg-mute: #b6bac3;
  --fg-dim: #7d818a;

  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 18px;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
  --space-9: 6rem;

  --max-w: 1080px;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

  /* Fluid type scale */
  --fs-1: clamp(0.875rem, 0.85rem + 0.1vw, 0.95rem);   /* small */
  --fs-2: clamp(1rem, 0.95rem + 0.2vw, 1.0625rem);     /* body */
  --fs-3: clamp(1.125rem, 1.05rem + 0.3vw, 1.25rem);   /* lead */
  --fs-4: clamp(1.5rem, 1.3rem + 0.8vw, 2rem);         /* h2 */
  --fs-5: clamp(2.25rem, 1.8rem + 2.2vw, 4rem);        /* hero */
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #fafafa;
    --bg-elev: #ffffff;
    --bg-elev-2: #f0f1f3;
    --border: #d8dadf;
    --border-soft: #e7e9ec;
    --fg: #14161a;
    --fg-mute: #4a4f59;
    --fg-dim: #80858f;
  }
}

html { font-size: 16px; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: var(--fs-2);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-soft); }
code { font-family: var(--font-mono); font-size: 0.9em; background: var(--bg-elev-2); padding: 0.1em 0.35em; border-radius: 4px; }

/* ---------- layout primitives ---------- */

.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--space-5);
}

.section { padding: var(--space-9) 0; border-bottom: 1px solid var(--border-soft); }
.section:last-of-type { border-bottom: none; }

.section-title {
  font-size: var(--fs-4);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0 0 var(--space-3) 0;
}
.section-note {
  color: var(--fg-mute);
  font-size: var(--fs-1);
  margin: 0 0 var(--space-6) 0;
}

/* ---------- hero ---------- */

.hero { padding: var(--space-9) 0 var(--space-8); border-bottom: none; }

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  color: var(--fg-mute);
  margin: 0 0 var(--space-5) 0;
  letter-spacing: 0.04em;
}

.brand-mark { color: var(--accent); }

.hero-headline {
  font-size: var(--fs-5);
  line-height: 1.05;
  letter-spacing: -0.025em;
  font-weight: 700;
  margin: 0;
  max-width: 18ch;
}

.hero-typewriter {
  color: var(--accent);
  position: relative;
  display: inline-block;
  vertical-align: top;
}

/* Ghost element reserves space for the longest phrase so the typewriter's
   length cycling never causes vertical layout shift (CLS). The visible
   stage overlays it. */
.hero-typewriter-ghost {
  visibility: hidden;
  pointer-events: none;
  user-select: none;
}

.hero-typewriter-stage {
  position: absolute;
  inset: 0;
  display: inline-block;
}

.hero-typewriter-text { display: inline; }

.hero-typewriter-cursor {
  display: inline-block;
  width: 1ch;
  color: var(--accent);
  animation: blink 1.05s steps(2) infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0; }
}

.hero-sub {
  margin: var(--space-6) 0 0 0;
  color: var(--fg-mute);
  font-size: var(--fs-3);
  max-width: 60ch;
}

.hero-scroll {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-7);
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--fg);
  font-size: var(--fs-1);
  font-family: var(--font-mono);
  letter-spacing: 0.03em;
  transition: background 0.15s, border-color 0.15s, transform 0.15s;
}
.hero-scroll:hover {
  background: var(--bg-elev);
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-1px);
}

@media (prefers-reduced-motion: reduce) {
  .hero-typewriter-cursor { animation: none; }
}

/* ---------- at a glance ---------- */

.glance-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: var(--space-4);
}

.glance-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  transition: border-color 0.15s, transform 0.15s;
}
.glance-card:hover { border-color: var(--accent); transform: translateY(-2px); }

.glance-num {
  font-size: clamp(1.75rem, 1.5rem + 1vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--accent);
  font-feature-settings: "tnum";
}
.glance-label {
  font-size: var(--fs-1);
  color: var(--fg-mute);
  text-transform: lowercase;
  letter-spacing: 0.02em;
}
.glance-card--placeholder .glance-num { color: var(--fg-dim); }

/* ---------- tile grid (current work) ---------- */

.tile-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-5);
  min-height: 4rem; /* keeps section visible while empty */
}

.tile {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-5);
  color: var(--fg);
  text-decoration: none;
  position: relative;
  overflow: hidden;
  transition: border-color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}
.tile::before {
  /* sweep accent that animates on hover */
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 0%, transparent 60%, rgba(255, 107, 53, 0.08) 100%);
  opacity: 0;
  transition: opacity 0.25s ease;
  pointer-events: none;
}
.tile:hover, .tile:focus-visible {
  border-color: var(--accent);
  transform: translateY(-3px);
  background: var(--bg-elev-2);
}
.tile:hover::before, .tile:focus-visible::before { opacity: 1; }
.tile:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

.tile-title {
  font-size: var(--fs-3);
  font-weight: 600;
  margin: 0;
  letter-spacing: -0.01em;
  color: var(--fg);
}
.tile-teaser { color: var(--fg-mute); margin: 0; flex-grow: 1; }
.tile-cta {
  display: inline-block;
  margin-top: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  letter-spacing: 0.04em;
  color: var(--accent);
  transition: transform 0.25s ease;
}
.tile:hover .tile-cta, .tile:focus-visible .tile-cta { transform: translateX(4px); }

/* ========== Detail page (per-tile) ========== */

.page-detail { background: var(--bg); }

.detail-nav {
  position: sticky;
  top: 0;
  z-index: 5;
  background: rgba(14, 15, 18, 0.78);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--border-soft);
}
@media (prefers-color-scheme: light) {
  .detail-nav { background: rgba(250, 250, 250, 0.78); }
}
.detail-nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-4);
  padding-bottom: var(--space-4);
  gap: var(--space-4);
}
.detail-back {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--fg);
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  letter-spacing: 0.04em;
  transition: border-color 0.2s, background 0.2s, transform 0.2s, color 0.2s;
}
.detail-back svg { transition: transform 0.2s; }
.detail-back:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--bg-elev);
}
.detail-back:hover svg { transform: translateX(-3px); }
.detail-eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  color: var(--fg-mute);
  letter-spacing: 0.04em;
}

/* hero block */
.detail-main { padding-bottom: var(--space-9); }

.detail-hero {
  padding: var(--space-9) 0 var(--space-7);
  border-bottom: 1px solid var(--border-soft);
}

.detail-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-7);
  align-items: center;
}
@media (min-width: 820px) {
  .detail-hero-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    gap: var(--space-8);
  }
}

.detail-hero-visual {
  position: relative;
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, var(--bg-elev) 0%, var(--bg-elev-2) 100%);
  border: 1px solid var(--border-soft);
  padding: var(--space-5);
  overflow: hidden;
  opacity: 0;
  transform: translateY(14px) scale(0.98);
  animation: detail-visual-rise 0.75s cubic-bezier(0.16, 1, 0.3, 1) 0.35s forwards;
}
.detail-hero-visual::before {
  /* subtle accent corner glow */
  content: "";
  position: absolute;
  top: -40%;
  right: -20%;
  width: 70%;
  height: 140%;
  background: radial-gradient(closest-side, rgba(255, 107, 53, 0.10), transparent 70%);
  pointer-events: none;
}
.detail-hero-visual svg.ill {
  position: relative;
  width: 100%;
  height: auto;
  display: block;
}
@keyframes detail-visual-rise {
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.detail-tag-line {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin: 0 0 var(--space-5) 0;
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-mute);
}
.line-draw {
  display: inline-block;
  width: 0;
  height: 1px;
  background: var(--accent);
  animation: line-draw 0.9s cubic-bezier(0.65, 0, 0.35, 1) 0.1s forwards;
}
@keyframes line-draw {
  from { width: 0; }
  to   { width: 56px; }
}

.detail-title {
  font-size: clamp(2rem, 1.6rem + 1.6vw, 3.25rem);
  line-height: 1.05;
  letter-spacing: -0.025em;
  font-weight: 700;
  margin: 0;
  max-width: 22ch;
  /* hero word reveal */
  opacity: 0;
  transform: translateY(14px);
  animation: hero-rise 0.7s cubic-bezier(0.16, 1, 0.3, 1) 0.2s forwards;
}
@keyframes hero-rise {
  to { opacity: 1; transform: translateY(0); }
}

.detail-chips {
  margin-top: var(--space-5);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}
.detail-chip {
  display: inline-block;
  padding: 0.3em 0.75em;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--fg-mute);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  opacity: 0;
  transform: translateY(8px) scale(0.9);
  animation: chip-pop 0.45s cubic-bezier(0.34, 1.56, 0.64, 1) calc(var(--chip-delay, 0ms) + 0.45s) forwards;
}
@keyframes chip-pop {
  to { opacity: 1; transform: translateY(0) scale(1); }
}
.detail-chip:hover { border-color: var(--accent); color: var(--accent); }

/* body content with stagger reveal */
.detail-body { padding-top: var(--space-7); }

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1), transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
  transition-delay: var(--reveal-delay, 0ms);
}
.reveal.is-revealed {
  opacity: 1;
  transform: translateY(0);
}

.detail-h2 {
  font-size: clamp(1.25rem, 1.1rem + 0.5vw, 1.5rem);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: var(--space-7) 0 var(--space-3) 0;
  position: relative;
  padding-left: var(--space-4);
}
.detail-h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.45em;
  bottom: 0.45em;
  width: 3px;
  background: var(--accent);
  border-radius: 3px;
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
  transition-delay: calc(var(--reveal-delay, 0ms) + 0.15s);
}
.detail-h2.is-revealed::before { transform: scaleY(1); }

.detail-p {
  margin: 0 0 var(--space-4) 0;
  color: var(--fg-mute);
  max-width: 68ch;
}
.detail-p strong { color: var(--fg); font-weight: 600; }
.detail-p em { color: var(--fg); font-style: italic; }
.detail-p code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--bg-elev-2);
  padding: 0.1em 0.4em;
  border-radius: 4px;
  color: var(--fg);
}

.detail-quote {
  margin: var(--space-5) 0;
  padding: var(--space-4) var(--space-5);
  border-left: 3px solid var(--accent);
  background: var(--bg-elev);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--fg);
  font-style: italic;
  max-width: 68ch;
}
.detail-quote strong { color: var(--accent); }

.detail-list {
  margin: 0 0 var(--space-5) 0;
  padding-left: 1.25rem;
  color: var(--fg-mute);
  max-width: 68ch;
}
.detail-list li {
  margin-bottom: var(--space-3);
  /* per-item incremental reveal once parent is revealed */
  opacity: 0;
  transform: translateX(8px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.detail-list.is-revealed li {
  opacity: 1;
  transform: translateX(0);
}
.detail-list li:nth-child(1) { transition-delay: calc(var(--reveal-delay, 0ms) + 0.20s); }
.detail-list li:nth-child(2) { transition-delay: calc(var(--reveal-delay, 0ms) + 0.30s); }
.detail-list li:nth-child(3) { transition-delay: calc(var(--reveal-delay, 0ms) + 0.40s); }
.detail-list li:nth-child(4) { transition-delay: calc(var(--reveal-delay, 0ms) + 0.50s); }
.detail-list li:nth-child(5) { transition-delay: calc(var(--reveal-delay, 0ms) + 0.60s); }
.detail-list li:nth-child(6) { transition-delay: calc(var(--reveal-delay, 0ms) + 0.70s); }
.detail-list li:nth-child(7) { transition-delay: calc(var(--reveal-delay, 0ms) + 0.80s); }
.detail-list li:nth-child(8) { transition-delay: calc(var(--reveal-delay, 0ms) + 0.90s); }
.detail-list li::marker { color: var(--accent); }
.detail-list strong { color: var(--fg); font-weight: 600; }

.detail-foot {
  margin-top: var(--space-9);
  padding-top: var(--space-7);
  border-top: 1px solid var(--border-soft);
}
.detail-back-big {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--fs-2);
  color: var(--fg-mute);
  letter-spacing: 0.02em;
  transition: color 0.2s, transform 0.2s;
}
.detail-back-big:hover {
  color: var(--accent);
  transform: translateX(-3px);
}

/* View Transitions API — smooth crossfade between index <-> detail.
   Tile gets `view-transition-name: tile-<slug>` inline, so the same
   visual element morphs into the detail hero on supported browsers
   (Chrome / Edge / Safari 18+). Older browsers ignore it harmlessly. */
@view-transition { navigation: auto; }

::view-transition-old(root),
::view-transition-new(root) {
  animation-duration: 0.35s;
  animation-timing-function: cubic-bezier(0.16, 1, 0.3, 1);
}

/* Reduced motion: cancel the choreography but keep content visible. */
@media (prefers-reduced-motion: reduce) {
  .reveal,
  .detail-list li,
  .detail-title,
  .detail-chip,
  .detail-hero-visual {
    opacity: 1 !important;
    transform: none !important;
    animation: none !important;
    transition: none !important;
  }
  .detail-h2::before { transform: scaleY(1) !important; transition: none !important; }
  .line-draw { width: 56px !important; animation: none !important; }
}

@keyframes fade-in {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}

@media (prefers-reduced-motion: reduce) {
  .tile.expanded .tile-body { animation: none; }
}

/* ---------- For-Signal sketch tile ---------- */

.for-signal { background: linear-gradient(180deg, transparent 0%, rgba(255, 107, 53, 0.04) 100%); }

.for-signal-card {
  border: 1.5px dashed var(--accent);
  border-radius: var(--radius-lg);
  padding: var(--space-7) var(--space-6);
  background: var(--bg-elev);
  position: relative;
}

.for-signal-tag {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  border-radius: 999px;
  background: rgba(255, 107, 53, 0.12);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  margin-bottom: var(--space-4);
}

.for-signal-header { margin-bottom: var(--space-7); max-width: 60ch; }
.for-signal-sub { color: var(--fg-mute); font-size: var(--fs-3); margin: var(--space-3) 0 0 0; }

.for-signal-blocks {
  display: grid;
  gap: var(--space-6);
  grid-template-columns: 1fr;
}

@media (min-width: 880px) {
  .for-signal-blocks { grid-template-columns: repeat(3, 1fr); gap: var(--space-5); }
}

.for-signal-block {
  background: var(--bg-elev-2);
  border-radius: var(--radius);
  padding: var(--space-5);
  border-left: 3px solid var(--accent);
}
.for-signal-block h3 {
  margin: 0 0 var(--space-3) 0;
  font-size: var(--fs-3);
  font-weight: 600;
  letter-spacing: -0.01em;
}
.for-signal-block p { margin: 0 0 var(--space-3) 0; color: var(--fg-mute); }
.for-signal-block p:last-child { margin-bottom: 0; }
.for-signal-block .lead { color: var(--fg); }
.for-signal-block strong { color: var(--fg); font-weight: 600; }

.for-signal-foot {
  margin: var(--space-7) 0 0 0;
  color: var(--fg-dim);
  font-size: var(--fs-1);
  font-style: italic;
  max-width: 65ch;
}

/* ---------- toolbox ---------- */

.toolbox-overlap { color: var(--accent); font-weight: 600; }

.toolbox-group { margin-bottom: var(--space-6); }
.toolbox-group-title {
  font-size: var(--fs-2);
  font-weight: 600;
  color: var(--fg-mute);
  margin: 0 0 var(--space-4) 0;
  letter-spacing: 0.02em;
}

.toolbox-grid {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-3);
}

.tool {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-4);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: border-color 0.15s, transform 0.15s;
}
.tool:hover { border-color: var(--accent); transform: translateY(-1px); }

.tool-name { font-weight: 600; font-size: var(--fs-2); }
.tool-note { font-size: 0.8rem; color: var(--fg-dim); font-family: var(--font-mono); letter-spacing: 0.02em; }

.tool--overlap { border-color: var(--accent); background: linear-gradient(135deg, var(--bg-elev) 0%, rgba(255, 107, 53, 0.07) 100%); }
.tool--overlap .tool-name { color: var(--accent); }

/* ---------- about ---------- */

.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-5);
}

.about-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-5);
}
.about-card h3 { margin: 0 0 var(--space-1) 0; font-size: var(--fs-3); }
.about-role {
  margin: 0 0 var(--space-3) 0;
  color: var(--fg-mute);
  font-family: var(--font-mono);
  font-size: var(--fs-1);
}
.about-bio { margin: 0 0 var(--space-3) 0; color: var(--fg-mute); }
.about-bio:last-child { margin-bottom: 0; }
.about-links {
  margin: 0;
  display: flex;
  gap: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--fs-1);
}
.about-card--placeholder .about-bio { color: var(--fg-dim); font-style: italic; }

/* ---------- footer ---------- */

.footer {
  padding: var(--space-7) 0;
  color: var(--fg-dim);
  font-size: var(--fs-1);
  font-family: var(--font-mono);
  text-align: center;
  border-top: 1px solid var(--border-soft);
}