/* =============================================================
   Optisim Consulting — Building physics & energy simulation
   Monochrome, technical-credibility design system
   Display: Space Grotesk · Body: IBM Plex Sans · Mono: IBM Plex Mono
   ============================================================= */

/* ---------- Tokens ---------- */
:root {
  --ink: #0a0a0a;
  --ink-2: #565659;
  --ink-3: #6e6e73;
  --paper: #ffffff;
  --surface: #f6f6f4;
  --hair: #e7e7e4;
  --rule: #d2d2cd;
  --inverse-bg: #0a0a0a;
  --inverse-ink: #f3f3f0;
  --inverse-ink-2: #9a9a98;
  --inverse-hair: #232323;
  --color-error: #c0392b;
  --color-success: #2d6a4f;

  --font-display: "Space Grotesk", system-ui, sans-serif;
  --font-body: "IBM Plex Sans", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;

  --maxw: 1240px;
  --gutter: clamp(1.25rem, 4vw, 4rem);
  --section-y: clamp(5rem, 10vw, 9rem);

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}
body {
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  font-size: clamp(1rem, 0.97rem + 0.15vw, 1.0625rem);
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; cursor: pointer; }

/* ---------- Blueprint grid backdrop ---------- */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(10,10,10,0.028) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(10,10,10,0.028) 1px, transparent 1px);
  background-size: clamp(48px, 7vw, 88px) clamp(48px, 7vw, 88px);
  background-position: center top;
  mask-image: linear-gradient(to bottom, #000 0%, #000 70%, transparent 100%);
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, #000 70%, transparent 100%);
}

/* ---------- Layout primitives ---------- */
.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.section { padding-block: var(--section-y); position: relative; }

/* ---------- Type ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.04;
  letter-spacing: -0.02em;
  text-wrap: balance;
}
.display {
  font-size: clamp(2.6rem, 1.4rem + 5.3vw, 5.6rem);
  font-weight: 500;
  letter-spacing: -0.035em;
}
.h2 { font-size: clamp(1.9rem, 1.3rem + 2.6vw, 3.15rem); letter-spacing: -0.028em; }
.h3 { font-size: clamp(1.25rem, 1.05rem + 0.9vw, 1.6rem); }
p { text-wrap: pretty; }
.lede {
  font-size: clamp(1.1rem, 1.02rem + 0.55vw, 1.4rem);
  line-height: 1.55;
  color: var(--ink-2);
  max-width: 34ch;
}

/* Visually hidden — accessible text for screen readers only */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Mono utility — eyebrows, labels, coordinates */
.mono {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-2);
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
}
.eyebrow::before {
  content: "";
  width: 1.6rem;
  height: 1px;
  background: var(--ink);
}

/* ---------- Navigation ---------- */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.05rem var(--gutter);
  background: rgba(255,255,255,0.78);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}
.nav.is-scrolled { border-bottom-color: var(--hair); }
.brand { display: inline-flex; align-items: center; }
.brand__logo { height: 42px; width: auto; display: block; }
/* footer version — invert the SVG paths so they show on dark bg */
.footer .brand__logo { filter: invert(1); }
.nav__links { display: flex; align-items: center; gap: clamp(1.2rem, 2.5vw, 2.4rem); }
.nav__link {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-2);
  position: relative;
  padding: 0.35rem 0;
  transition: color 0.2s var(--ease);
}
.nav__link::after {
  content: "";
  position: absolute;
  left: 0; bottom: -2px;
  width: 100%; height: 1px;
  background: var(--ink);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease);
}
.nav__link:hover, .nav__link[aria-current="page"] { color: var(--ink); }
.nav__link:hover::after, .nav__link[aria-current="page"]::after { transform: scaleX(1); }
.nav__cta {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border: 1px solid var(--ink);
  padding: 0.55rem 1rem;
  transition: background 0.25s var(--ease), color 0.25s var(--ease);
}
.nav__cta:hover { background: var(--ink); color: var(--paper); }

/* mobile nav toggle */
.nav__toggle { display: none; width: 30px; height: 30px; position: relative; background: none; border: 0; }
.nav__toggle span { position: absolute; left: 4px; right: 4px; height: 1.5px; background: var(--ink); transition: transform 0.3s var(--ease), opacity 0.2s; }
.nav__toggle span:nth-child(1) { top: 10px; }
.nav__toggle span:nth-child(2) { bottom: 10px; }
.nav.is-open .nav__toggle span:nth-child(1) { transform: translateY(4px) rotate(45deg); }
.nav.is-open .nav__toggle span:nth-child(2) { transform: translateY(-4px) rotate(-45deg); }

@media (max-width: 820px) {
  .nav__toggle { display: block; }
  .nav__links {
    position: fixed;
    inset: 0 0 auto 0;
    top: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 1.4rem;
    padding: 6rem var(--gutter) 2.6rem;
    background: var(--paper);
    border-bottom: 1px solid var(--hair);
    transform: translateY(-102%);
    transition: transform 0.45s var(--ease);
  }
  .nav.is-open .nav__links { transform: translateY(0); }
  .nav__link { font-size: 1rem; }
  .nav__cta { font-size: 0.85rem; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.95rem 1.5rem;
  border: 1px solid var(--ink);
  transition: background 0.28s var(--ease), color 0.28s var(--ease), transform 0.28s var(--ease);
}
.btn .arrow { transition: transform 0.28s var(--ease); }
.btn:hover .arrow { transform: translateX(4px); }
.btn--solid { background: var(--ink); color: var(--paper); }
.btn--solid:hover { background: #2a2a2a; }
.btn--ghost:hover { background: var(--ink); color: var(--paper); }
.btn--inverse { border-color: var(--inverse-ink); color: var(--inverse-ink); }
.btn--inverse.btn--solid { background: var(--inverse-ink); color: var(--inverse-bg); }
.btn--inverse.btn--ghost:hover { background: var(--inverse-ink); color: var(--inverse-bg); }
.btn:disabled, .btn[aria-busy="true"] { opacity: 0.6; cursor: not-allowed; pointer-events: none; }
:focus-visible { outline: 2px solid var(--ink); outline-offset: 3px; }

/* skip-to-content */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 200;
  background: var(--ink);
  color: var(--paper);
  padding: 0.55rem 1.1rem;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  transition: top 0.2s var(--ease);
}
.skip-link:focus { top: 1rem; }

/* ============================================================
   HERO
   ============================================================ */
.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: clamp(2rem, 5vw, 5rem);
  padding-top: clamp(7rem, 12vh, 9rem);
  padding-bottom: clamp(3rem, 6vh, 5rem);
}
.hero__lead { position: relative; z-index: 2; }
.hero__title { margin-top: 1.6rem; }
.hero__title .ln { display: block; overflow: hidden; }
.hero__title .ln > span { display: block; }
.hero__sub {
  margin-top: 1.8rem;
  font-size: clamp(1.05rem, 0.98rem + 0.5vw, 1.32rem);
  line-height: 1.55;
  color: var(--ink-2);
  max-width: 46ch;
}
.hero__actions { margin-top: 2.4rem; display: flex; flex-wrap: wrap; gap: 0.9rem; }

.hero__meta {
  margin-top: 3.2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 2.2rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--hair);
}
.hero__meta dt { font-family: var(--font-mono); font-size: 0.66rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-3); }
.hero__meta dd { font-family: var(--font-display); font-weight: 500; font-size: 1.02rem; margin-top: 0.3rem; }

/* simulation mesh panel */
.hero__viz { position: relative; align-self: stretch; min-height: 320px; }
.mesh {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
.mesh-frame {
  position: absolute;
  inset: 0;
  border: 1px solid var(--hair);
}
.mesh-frame::before, .mesh-frame::after {
  content: "";
  position: absolute;
  background: var(--ink);
}
.mesh-frame::before { left: -1px; top: -1px; width: 14px; height: 1px; }
.mesh-frame::after { left: -1px; top: -1px; width: 1px; height: 14px; }
.mesh__label {
  position: absolute;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  color: var(--ink-3);
  text-transform: uppercase;
}
.mesh__label--tr { top: 0.7rem; right: 0.8rem; }
.mesh__label--bl { bottom: 0.7rem; left: 0.8rem; }

@media (max-width: 920px) {
  .hero { grid-template-columns: 1fr; min-height: auto; }
  .hero__viz { min-height: 300px; order: 2; }
  .hero__sub { max-width: 56ch; }
}

/* scroll cue */
.scroll-cue {
  position: absolute;
  bottom: 1.7rem; left: var(--gutter);
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-3);
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
}
.scroll-cue i { width: 1px; height: 26px; background: var(--rule); display: block; position: relative; overflow: hidden; }
.scroll-cue i::after { content:""; position:absolute; inset:0; background: var(--ink); transform: translateY(-100%); animation: cue 2.4s var(--ease) infinite; }
@keyframes cue { 0%{transform:translateY(-100%);} 50%{transform:translateY(0);} 100%{transform:translateY(100%);} }
@media (prefers-reduced-motion: reduce) { .scroll-cue i::after { animation: none; } }

/* ============================================================
   SECTION HEADERS
   ============================================================ */
.sec-head { display: grid; grid-template-columns: 1fr; gap: 1.1rem; max-width: 60ch; }
.sec-head__index { font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.2em; color: var(--ink-3); }
.sec-head .h2 { margin-top: 0.2rem; }
.sec-head p { color: var(--ink-2); max-width: 52ch; }

/* ============================================================
   PILLARS
   ============================================================ */
.pillars { margin-top: 2.8rem; border-top: 1px solid var(--rule); }
.pillar {
  display: grid;
  grid-template-columns: 5.5rem 1fr minmax(0, 1.05fr);
  gap: clamp(1.2rem, 4vw, 3.5rem);
  padding-block: clamp(2.2rem, 4vw, 3.4rem);
  border-bottom: 1px solid var(--hair);
  position: relative;
}
.pillar__num {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--ink);
  padding-top: 0.4rem;
}
.pillar__num .tag {
  display: block;
  margin-top: 0.7rem;
  font-size: 0.6rem;
  letter-spacing: 0.14em;
  color: var(--ink-3);
}
.pillar__main { }
.pillar__title { font-size: clamp(1.5rem, 1.2rem + 1.4vw, 2.25rem); letter-spacing: -0.025em; }
.pillar__status {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-2);
}
.pillar__status .dot { width: 6px; height: 6px; border: 1px solid var(--ink); }
.pillar__status .dot.is-live { background: var(--ink); border-radius: 50%; }
.pillar__status .dot.is-dev { background: repeating-linear-gradient(45deg, var(--ink) 0 2px, transparent 2px 4px); }
.pillar__status .dot.is-vision { border-radius: 50%; }
.pillar__body { color: var(--ink-2); padding-top: 0.4rem; }
.pillar__body p + p { margin-top: 0.9rem; }
.pillar__list { list-style: none; padding: 0; margin-top: 1.2rem; display: grid; gap: 0.55rem; }
.pillar__list li {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  color: var(--ink);
  padding-left: 1.2rem;
  position: relative;
}
.pillar__list li::before { content: "—"; position: absolute; left: 0; color: var(--ink-3); }

@media (max-width: 820px) {
  .pillar { grid-template-columns: 1fr; gap: 1rem; }
  .pillar__num { display: flex; align-items: baseline; gap: 1rem; padding-top: 0; }
  .pillar__num .tag { margin-top: 0; }
}

/* ============================================================
   VISION (inverse)
   ============================================================ */
.vision {
  background: var(--inverse-bg);
  color: var(--inverse-ink);
  position: relative;
  overflow: hidden;
}
.vision .eyebrow { color: var(--inverse-ink-2); }
.vision .eyebrow::before { background: var(--inverse-ink); }
.vision__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: center;
  position: relative;
  z-index: 2;
}
.vision__title { color: var(--inverse-ink); margin-top: 1.4rem; }
.vision__body { color: var(--inverse-ink-2); margin-top: 1.6rem; max-width: 50ch; }
.vision__body p + p { margin-top: 1rem; }
.vision__note {
  margin-top: 1.8rem;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--inverse-ink-2);
  border-left: 1px solid var(--inverse-hair);
  padding-left: 1rem;
}
.stock {
  position: relative;
  aspect-ratio: 1 / 1;
  width: 100%;
  border: 1px solid var(--inverse-hair);
}
.stock__caption {
  position: absolute;
  bottom: -1.9rem; left: 0;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--inverse-ink-2);
}
@media (max-width: 820px) {
  .vision__grid { grid-template-columns: 1fr; }
  .stock { max-width: 420px; }
}

/* ============================================================
   CONTACT / CTA
   ============================================================ */
.contact { border-top: 1px solid var(--rule); }
.contact__grid {
  display: grid;
  align-items: start;
}
.contact__intro { max-width: 44rem; margin-inline: auto; }
.contact__intro .h2 { margin-top: 1.2rem; max-width: 26ch; }
.contact__intro p { color: var(--ink-2); margin-top: 1.3rem; max-width: 52ch; }

.contact__direct { margin-top: 2.6rem; display: grid; gap: 0; border-top: 1px solid var(--hair); max-width: 34rem; }
.contact__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--hair);
}
.contact__row .k { font-family: var(--font-mono); font-size: 0.66rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-3); }
.contact__row .v { font-family: var(--font-display); font-weight: 500; font-size: 1.02rem; }
.contact__row a.v { position: relative; transition: opacity 0.2s; }
.contact__row a.v:hover { opacity: 0.55; }

@media (max-width: 820px) {
  .contact__grid { grid-template-columns: 1fr; }
}

/* ============================================================
   ABOUT PAGE
   ============================================================ */
.about-hero {
  display: grid;
  grid-template-columns: 1fr 0.78fr;
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: end;
  padding-top: clamp(8rem, 14vh, 11rem);
  padding-bottom: var(--section-y);
}
.about-hero__title { margin-top: 1.4rem; }
.about-hero__title .ln { display: block; overflow: hidden; }
.about-hero__title .ln > span { display: block; }
.about-hero__role {
  margin-top: 1.4rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-2);
}
.about-hero__lede { margin-top: 1.6rem; font-size: clamp(1.05rem, 0.98rem + 0.5vw, 1.28rem); color: var(--ink-2); line-height: 1.55; max-width: 50ch; }
.portrait {
  position: relative;
  border: 1px solid var(--hair);
  padding: 0.6rem;
  background: var(--surface);
}
.portrait img { width: 100%; height: auto; filter: grayscale(100%) contrast(1.04); }
.portrait__tag {
  position: absolute;
  left: 0.6rem; bottom: 0.6rem; right: 0.6rem;
  display: flex; justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--paper);
  padding: 0.6rem 0.7rem;
  background: linear-gradient(to top, rgba(0,0,0,0.55), transparent);
}
@media (max-width: 820px) {
  .about-hero { grid-template-columns: 1fr; align-items: start; }
  .portrait { max-width: 360px; }
}
@media (max-width: 560px) {
  .about-hero__title {
    font-size: 7.8vw;
    white-space: nowrap;
  }
  .about-hero__title .ln,
  .about-hero__title .ln > span { display: inline; }
  .about-hero__title .ln:first-child { margin-right: 0.28em; }
}

/* credentials strip */
.creds { border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); }
.creds__grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.cred {
  padding: clamp(1.6rem, 3vw, 2.4rem) clamp(1rem, 2.4vw, 1.8rem);
  border-left: 1px solid var(--hair);
}
.cred:first-child { border-left: 0; padding-left: 0; }
.cred__k { font-family: var(--font-mono); font-size: 0.62rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-3); }
.cred__v { font-family: var(--font-display); font-weight: 500; font-size: clamp(1.05rem, 0.95rem + 0.5vw, 1.35rem); margin-top: 0.6rem; letter-spacing: -0.01em; }
.cred__d { font-size: 0.84rem; color: var(--ink-2); margin-top: 0.4rem; line-height: 1.4; }
@media (max-width: 720px) {
  .creds__grid { grid-template-columns: 1fr 1fr; }
  .cred { border-top: 1px solid var(--hair); }
  .cred:first-child, .cred:nth-child(2) { border-top: 0; }
  .cred:nth-child(odd) { border-left: 0; padding-left: 0; }
}

/* prose / narrative */
.narrative { display: grid; grid-template-columns: 0.42fr 1fr; gap: clamp(1.5rem, 5vw, 4rem); }
.narrative__aside { position: sticky; top: 6rem; align-self: start; }
.narrative__aside .mono { color: var(--ink-3); }
.narrative__body { max-width: 62ch; }
.narrative__body h3 { margin-top: 2.6rem; margin-bottom: 0.9rem; }
.narrative__body h3:first-child { margin-top: 0; }
.narrative__body p { color: var(--ink-2); }
.narrative__body p + p { margin-top: 1rem; }
.narrative__body strong { color: var(--ink); font-weight: 600; }
@media (max-width: 820px) {
  .narrative { grid-template-columns: 1fr; }
  .narrative__aside { position: static; }
}

/* tieback */
.tieback { border-top: 1px solid var(--rule); text-align: center; }
.tieback .h2 { max-width: 22ch; margin-inline: auto; }
.tieback p { color: var(--ink-2); margin-top: 1rem; }
.tieback .btn { margin-top: 2rem; }

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  background: var(--inverse-bg);
  color: var(--inverse-ink);
  padding-block: clamp(3rem, 6vw, 4.5rem);
}
.footer__top { display: flex; justify-content: space-between; align-items: flex-start; gap: 2rem; flex-wrap: wrap; }
.footer .brand__mark { color: var(--inverse-ink); width: 34px; height: 34px; }
.footer .brand__name { color: var(--inverse-ink); }
.footer__tag { font-family: var(--font-mono); font-size: 0.66rem; letter-spacing: 0.2em; text-transform: uppercase; color: var(--inverse-ink-2); margin-top: 1rem; }
.footer__contacts { display: grid; gap: 0.4rem; text-align: right; }
.footer__contacts a, .footer__contacts span {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--inverse-ink-2);
  transition: color 0.2s;
}
.footer__contacts a:hover { color: var(--inverse-ink); }
.footer__bottom {
  margin-top: clamp(2.4rem, 5vw, 3.6rem);
  padding-top: 1.4rem;
  border-top: 1px solid var(--inverse-hair);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}
.footer__copy { font-family: var(--font-mono); font-size: 0.64rem; letter-spacing: 0.08em; color: var(--inverse-ink-2); }
.footer__nav { display: flex; gap: 1.4rem; }
.footer__nav a { font-family: var(--font-mono); font-size: 0.64rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--inverse-ink-2); transition: color 0.2s; }
.footer__nav a:hover { color: var(--inverse-ink); }
@media (max-width: 560px) {
  .footer__contacts { text-align: left; }
  .footer__top { flex-direction: column; }
}

/* ============================================================
   PROJECTS PAGE
   ============================================================ */

/* Page hero */
.projects-hero {
  padding-top: clamp(8rem, 14vh, 11rem);
  padding-bottom: var(--section-y);
  max-width: 820px;
}
.projects-hero .display { margin-top: 1.6rem; }
.projects-hero .display .ln { display: block; overflow: hidden; }
.projects-hero .display .ln > span { display: block; }
.projects-hero__sub {
  margin-top: 1.8rem;
  font-size: clamp(1.05rem, 0.98rem + 0.5vw, 1.32rem);
  line-height: 1.55;
  color: var(--ink-2);
  max-width: 52ch;
}
.projects-hero__kpi {
  display: flex;
  flex-wrap: wrap;
  gap: 2.8rem;
  margin-top: 3rem;
  padding-top: 1.6rem;
  border-top: 1px solid var(--hair);
}
.kpi-n {
  font-family: var(--font-display);
  font-size: clamp(2rem, 1.5rem + 1.8vw, 2.8rem);
  font-weight: 500;
  letter-spacing: -0.03em;
  line-height: 1;
}
.kpi-l {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-top: 0.5rem;
}

/* Project section */
.proj-section { border-top: 1px solid var(--rule); }
.proj-section__head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 1.5rem;
  margin-bottom: 2.8rem;
  flex-wrap: wrap;
}
.proj-section__head-text { max-width: 54ch; }
.proj-section__head-text .sec-head__index { display: block; margin-bottom: 0.8rem; }
.proj-section__head-text .h2 { margin-top: 0.4rem; }
.proj-section__head-text p { color: var(--ink-2); margin-top: 1rem; max-width: 50ch; }
.proj-section__note {
  margin-top: 1rem;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
  border-left: 2px solid var(--ink);
  padding-left: 0.8rem;
  display: inline-block;
}

/* Project card */
.proj-card {
  flex: 0 0 300px;
  height: 360px;
  border-radius: 1.25rem;
  overflow: hidden;
  position: relative;
  background: var(--surface);
  scroll-snap-align: start;
  cursor: pointer;
}
@media (min-width: 600px) { .proj-card { flex: 0 0 330px; } }
@media (min-width: 900px) { .proj-card { flex: 0 0 352px; height: 390px; } }

/* Image wrapper — covers full card, transitions to top half on hover */
.proj-card__img-wrap {
  position: absolute;
  inset: 0;
  transition: bottom 0.55s var(--ease);
}
.proj-card__img {
  width: 100%; height: 100%;
  object-fit: cover; object-position: center;
}
.proj-card__scrim {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 60%;
  background: linear-gradient(to top, rgba(10,10,10,0.5), transparent);
  pointer-events: none;
  transition: opacity 0.4s;
}

/* Hover interaction — only on pointer-capable devices */
@media (hover: hover) and (pointer: fine) {
  .proj-card__scrim { opacity: 0; }
  .proj-card:hover .proj-card__scrim { opacity: 1; }
  .proj-card:hover .proj-card__img-wrap { bottom: 48%; }
  .proj-card__body {
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.4s var(--ease), transform 0.4s var(--ease);
  }
  .proj-card:hover .proj-card__body { opacity: 1; transform: translateY(0); }
}

/* Touch/no-hover fallback: always show split layout */
@media (hover: none), (pointer: coarse) {
  .proj-card__img-wrap { bottom: 48%; }
  .proj-card__scrim { display: none; }
}

/* Card body (text panel) */
.proj-card__body {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 48%;
  padding: 1rem 1.2rem 0.9rem;
  background: var(--paper);
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.18rem;
}
.proj-card__type {
  font-family: var(--font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-3);
  display: flex;
  align-items: center;
  gap: 0.45rem;
}
.proj-card__type::before { content: ""; width: 14px; height: 1px; background: var(--ink-3); }
.proj-card__title {
  font-family: var(--font-display);
  font-size: clamp(0.98rem, 0.9rem + 0.35vw, 1.1rem);
  font-weight: 600;
  letter-spacing: -0.015em;
  line-height: 1.2;
  color: var(--ink);
  margin-top: 0.25rem;
}
.proj-card__summary {
  font-size: 0.8rem;
  color: var(--ink-2);
  line-height: 1.45;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-top: 0.2rem;
}
.proj-card__foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
  padding-top: 0.55rem;
}
.proj-card__cta {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: gap 0.2s var(--ease);
}
.proj-card__cta:hover { gap: 0.7rem; }
.proj-card__result {
  font-family: var(--font-mono);
  font-size: 0.55rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
}

/* Image tints so sibling cards look distinct within a section */
.proj-card--dim .proj-card__img { filter: brightness(0.75) saturate(0.85); }
.proj-card--mute .proj-card__img { filter: brightness(0.58) saturate(0.6); }

/* Featured card — a single project shown full-width, one per section.
   Laid out in normal flow rather than the absolute image overlay above, so the
   text panel hugs its content and the screenshot keeps its own aspect ratio.
   The :hover selectors are matched only to out-specify the .proj-card hover
   rules above; the featured card has no hover state of its own. */
.proj-card--featured {
  flex: none;
  width: 100%;
  height: auto;
  cursor: default;
  display: flex;
  flex-direction: column;
}
.proj-card--featured .proj-card__img-wrap,
.proj-card--featured:hover .proj-card__img-wrap {
  position: relative;
  inset: auto;
  bottom: auto;
  width: 100%;
  /* each featured card declares its own frame ratio inline via --card-ratio;
     the fallback is only a sane default for a card that forgets to set one */
  aspect-ratio: var(--card-ratio, 1600 / 1044);
  max-height: none;
  /* hairline so light-backgrounded imagery (UI screenshots, charts) has a
     defined edge instead of dissolving into the page */
  border: 1px solid var(--hair);
}
.proj-card--featured .proj-card__img { object-position: center top; }

/* Chart / diagram imagery. Photography can be cropped to fill a frame; a chart
   cannot — cropping an axis destroys the data. These are contained on paper and
   given breathing room instead. */
.proj-card__img-wrap--chart {
  background: var(--paper);
}
.proj-card--featured .proj-card__img-wrap--chart .proj-card__img {
  object-fit: contain;
  object-position: center;
  padding: clamp(1rem, 3vw, 2.5rem);
}
.proj-card--featured .proj-card__scrim,
.proj-card--featured:hover .proj-card__scrim { display: none; }
.proj-card--featured .proj-card__body,
.proj-card--featured:hover .proj-card__body {
  position: relative;
  inset: auto;
  height: auto;
  opacity: 1;
  transform: none;
  padding: 1.2rem 1.4rem 1.4rem;
}
.proj-card--featured .proj-card__summary {
  -webkit-line-clamp: unset;
  overflow: visible;
  margin-top: 0.35rem;
}
@media (min-width: 900px) {
  .proj-card--featured .proj-card__body { padding: 1.5rem 1.8rem 1.7rem; }
  .proj-card--featured .proj-card__title { font-size: 1.3rem; }
  .proj-card--featured .proj-card__summary { font-size: 0.9rem; max-width: 68ch; }
}

/* Placeholder image slot — awaiting real imagery; matches the mesh/frame
   motif used elsewhere for not-yet-rendered visuals rather than faking a photo. */
.proj-card__img-wrap--pending {
  position: relative;
  width: 100%;
  border: 1px solid var(--rule);
  background: var(--surface);
}
.proj-card__img-wrap--pending::before,
.proj-card__img-wrap--pending::after {
  content: "";
  position: absolute;
  background: var(--ink);
}
.proj-card__img-wrap--pending::before { left: -1px; top: -1px; width: 14px; height: 1px; }
.proj-card__img-wrap--pending::after { left: -1px; top: -1px; width: 1px; height: 14px; }
.proj-card__img-wrap--pending .pending__label {
  position: absolute;
  bottom: 0.9rem; left: 1rem;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
}

/* ============================================================
   Reveal animation base (IntersectionObserver-driven; CSS transitions)
   ============================================================ */
[data-reveal],
[data-reveal-group] [data-reveal-item] {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.75s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.75s cubic-bezier(0.16, 1, 0.3, 1);
}
[data-reveal].is-visible,
[data-reveal-group] [data-reveal-item].is-visible {
  opacity: 1;
  transform: translateY(0);
}
/* no-JS and reduced-motion: skip entirely */
html.no-js [data-reveal],
html.no-js [data-reveal-group] [data-reveal-item] {
  opacity: 1 !important;
  transform: none !important;
  transition: none !important;
}
@media (prefers-reduced-motion: reduce) {
  [data-reveal],
  [data-reveal-group] [data-reveal-item] {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}