feat: add Night Shift layer (boot intro, ops strip, headlight, chapter numerals, film grain)

src/styles/nightshift.css

@@ -0,0 +1,185 @@
+/* Night Shift: cinematic layer on top of the night-drive world. Imported last. */
+
+:root {
+  --ns-grain: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/></filter><rect width='100%' height='100%' filter='url(%23n)' opacity='.55'/></svg>");
+}
+
+/* Film stock: grain + vignette above the world, below the UI. */
+body::after {
+  content: '';
+  position: fixed;
+  inset: 0;
+  z-index: var(--z-atmosphere);
+  pointer-events: none;
+  background:
+    radial-gradient(120% 90% at 50% 45%, transparent 55%, rgb(2 4 12 / 55%) 100%),
+    var(--ns-grain);
+  background-size: auto, 160px 160px;
+  mix-blend-mode: soft-light;
+  opacity: 0.5;
+}
+
+/* Operations strip */
+.ops-strip {
+  position: fixed;
+  inset-block-end: 22px;
+  inset-inline: 0;
+  margin-inline: auto;
+  width: max-content;
+  max-width: calc(100vw - 32px);
+  z-index: var(--z-hud);
+  display: none;
+  align-items: center;
+  gap: 0.7rem;
+  padding: 0.5rem 1rem;
+  border: var(--panel-border);
+  border-radius: 999px;
+  background: var(--surface);
+  color: var(--text-muted);
+  font: 500 0.72rem/1 var(--mono);
+  letter-spacing: 0.08em;
+  text-transform: uppercase;
+  pointer-events: none;
+}
+.ops-strip strong { color: var(--text); font-weight: 600; }
+.ops-strip__sep { opacity: 0.4; }
+.ops-strip__dot {
+  width: 7px;
+  height: 7px;
+  border-radius: 50%;
+  background: #6ee7a8;
+  box-shadow: 0 0 10px #6ee7a8;
+}
+@media (min-width: 1100px) {
+  .ops-strip { display: inline-flex; }
+}
+@media (prefers-reduced-motion: no-preference) {
+  .ops-strip__dot { animation: ns-pulse 2.4s ease-in-out infinite; }
+}
+@keyframes ns-pulse { 50% { opacity: 0.35; } }
+
+/* Boot sequence */
+.boot-sequence {
+  position: fixed;
+  inset: 0;
+  z-index: 100;
+  display: grid;
+  align-content: center;
+  justify-items: start;
+  gap: 2rem;
+  padding: clamp(1.5rem, 8vw, 8rem);
+  background: #02040c;
+  color: var(--accent);
+  font: 500 clamp(0.8rem, 0.7rem + 0.5vw, 1.05rem)/1.8 var(--mono);
+  cursor: pointer;
+  transition: opacity 600ms ease, filter 600ms ease;
+}
+.boot-sequence[data-leaving] { opacity: 0; filter: blur(6px); pointer-events: none; }
+.boot-sequence__log { list-style: none; margin: 0; padding: 0; }
+.boot-sequence__log li::before { content: '> '; color: var(--world-magenta); }
+.boot-sequence__log li:last-child::after {
+  content: '_';
+  margin-inline-start: 0.2em;
+  animation: ns-blink 700ms steps(1) infinite;
+}
+.boot-sequence__skip { color: var(--text-muted); font-size: 0.75rem; letter-spacing: 0.1em; text-transform: uppercase; }
+@keyframes ns-blink { 50% { opacity: 0; } }
+
+/* Headlight: soft beam that follows a fine pointer. */
+html[data-headlight='on'] .reading-viewport::before {
+  content: '';
+  position: fixed;
+  inset: 0;
+  z-index: var(--z-atmosphere);
+  pointer-events: none;
+  background: radial-gradient(420px circle at var(--hx, 50%) var(--hy, 50%), rgb(255 214 147 / 10%), transparent 70%);
+  mix-blend-mode: screen;
+}
+
+/* Spotlight borders on interactive surfaces. */
+.project-case-study,
+.project-card,
+.contact-destination,
+.infrastructure-flow-figure {
+  position: relative;
+}
+html[data-headlight='on'] :is(.project-case-study, .project-card, .contact-destination, .infrastructure-flow-figure)::after {
+  content: '';
+  position: absolute;
+  inset: 0;
+  border-radius: inherit;
+  pointer-events: none;
+  background: radial-gradient(320px circle at var(--mx, 50%) var(--my, 50%), rgb(120 216 229 / 14%), transparent 65%);
+  opacity: 0;
+  transition: opacity 240ms ease;
+}
+html[data-headlight='on'] :is(.project-case-study, .project-card, .contact-destination, .infrastructure-flow-figure):hover::after {
+  opacity: 1;
+}
+
+/* Chapter numerals: outlined, drifting section numbers. */
+.reading-stage { counter-reset: chapter; }
+.portfolio-section > h2,
+.project-stage__lead > h2 { position: relative; }
+.portfolio-section { counter-increment: chapter; }
+.portfolio-section > h2::before,
+.project-stage__lead > h2::before {
+  content: '0' counter(chapter);
+  position: absolute;
+  inset-block-end: 100%;
+  inset-inline-start: 0;
+  margin-block-end: 0.15em;
+  font: 700 var(--step-4)/0.85 var(--mono);
+  letter-spacing: -0.04em;
+  color: transparent;
+  -webkit-text-stroke: 1px rgb(120 216 229 / 38%);
+  pointer-events: none;
+  user-select: none;
+}
+@media (max-width: 720px) {
+  .portfolio-section > h2::before,
+  .project-stage__lead > h2::before { font-size: var(--step-3); }
+}
+@media (forced-colors: active) {
+  .portfolio-section > h2::before,
+  .project-stage__lead > h2::before { display: none; }
+}
+
+/* Kinetic type + scroll-linked reveals (progressive enhancement). */
+@media (prefers-reduced-motion: no-preference) {
+  .hero-name__text {
+    font-variation-settings: 'wght' 800;
+    transition: font-variation-settings 400ms ease, letter-spacing 400ms ease;
+  }
+  .hero-name:hover .hero-name__text {
+    font-variation-settings: 'wght' 520;
+    letter-spacing: 0.02em;
+  }
+  @supports (animation-timeline: view()) {
+    .portfolio-section > h2::before,
+    .project-stage__lead > h2::before {
+      animation: ns-drift linear both;
+      animation-timeline: view();
+      animation-range: entry 0% cover 60%;
+    }
+    .project-card,
+    .project-case-study {
+      animation: ns-rise linear both;
+      animation-timeline: view();
+      animation-range: entry 0% entry 60%;
+    }
+  }
+}
+@keyframes ns-drift {
+  from { transform: translateX(-12%); opacity: 0; }
+  to { transform: none; opacity: 1; }
+}
+@keyframes ns-rise {
+  from { transform: translateY(28px); opacity: 0.2; }
+  to { transform: none; opacity: 1; }
+}
+
+@media print {
+  body::after, .ops-strip, .boot-sequence { display: none !important; }
+  .portfolio-section > h2::before { display: none; }
+}