/* ==========================================================================
   sections.css — per-section layout. Each block maps to one CMS pattern.
   ========================================================================== */

/* Theme-scoped ink + line roles (kept legible per DESIGN.md contrast rules) */
.is-dark  { --ink: var(--color-chalk);    --ink-soft: #C2C2C0; --line: var(--hairline-on-dark); }
.is-light { --ink: var(--color-graphite); --ink-soft: #4A4A48; --line: var(--hairline-on-light); }

/* Section vertical rhythm (the section classes don't use .section) */
.works, .spec { padding-block: var(--space-section); }
.contact { padding-top: var(--space-section); }

.link-wipe { position: relative; display: inline-flex; align-items: center; gap: 8px; }
.link-wipe::after {
  content: ""; position: absolute; left: 0; bottom: -5px; width: 0; height: 1px;
  background: currentColor; transition: width var(--dur-state) var(--ease-out-expo);
}
.link-wipe:hover::after, .link-wipe:focus-visible::after { width: 100%; }

/* ---------- NAV ---------- */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: var(--z-nav);
  mix-blend-mode: difference; color: #fff;
  transition: padding var(--dur-state) var(--ease-out-expo);
}
.nav__inner {
  display: grid; grid-template-columns: 1fr auto 1fr; align-items: start;
  gap: 24px; padding: clamp(20px, 2.4vw, 32px) var(--gutter);
  transition: padding var(--dur-state) var(--ease-out-expo);
}
.nav.is-scrolled .nav__inner { padding-block: 16px; }
.nav__mark { font-size: var(--fs-label); font-weight: 600; letter-spacing: var(--tracking-label); text-transform: uppercase; }
.nav__hq { display: flex; flex-direction: column; align-items: center; gap: 3px; justify-self: center; text-align: center; }
.nav__hq .mono { color: #b4b4b4; }
.nav__links { display: flex; gap: 30px; justify-self: end; }
.nav__links a { font-size: var(--fs-label); font-weight: 500; letter-spacing: var(--tracking-label); text-transform: uppercase; position: relative; }
.nav__links a::after { content: ""; position: absolute; left: 0; bottom: -5px; width: 0; height: 1px; background: currentColor; transition: width var(--dur-state) var(--ease-out-expo); }
.nav__links a:hover::after, .nav__links a:focus-visible::after { width: 100%; }
.nav__toggle { display: none; width: 40px; height: 40px; align-items: center; justify-content: center; justify-self: end; }
.nav__toggle-bar, .nav__toggle-bar::before, .nav__toggle-bar::after { content: ""; display: block; width: 24px; height: 1.5px; background: #fff; transition: transform var(--dur-state) var(--ease-out-expo); }
.nav__toggle-bar::before { position: absolute; transform: translateY(-7px); }
.nav__toggle-bar::after { position: absolute; transform: translateY(7px); }

/* ---------- HERO ---------- */
.hero { min-height: 96vh; overflow: hidden; }
.hero__media {
  position: absolute; top: 31%; right: 0; width: 49%; height: 50%;
  z-index: var(--z-media); overflow: hidden;
}
.hero__inner {
  position: relative; z-index: var(--z-content);
  min-height: 96vh; display: flex; flex-direction: column; justify-content: center; align-items: flex-start;
  padding-top: clamp(118px, 13vh, 168px);
  padding-bottom: clamp(44px, 6vh, 80px);
}
.hero__title { font-size: clamp(2.7rem, 8.9vw, 8.9rem); color: var(--color-smoke); }
.hero__title .line { display: block; overflow: hidden; }
.hero__title .line__in { display: inline-block; white-space: nowrap; }
.hero__title .line--tight .line__in { font-size: 0.92em; letter-spacing: -0.05em; }
.hero__exposed { color: var(--color-smoke); }
.hero__stats { display: flex; gap: clamp(24px, 4vw, 72px); max-width: 620px; margin-top: clamp(28px, 3vh, 42px); }
.hero__explore {
  position: relative; margin-top: clamp(18px, 2.8vh, 30px);
  z-index: var(--z-content); transform: none; align-self: flex-start; margin-left: 0;
}

/* ---------- STAT BLOCK ---------- */
.stat { flex: 1 1 0; min-width: 0; max-width: 320px; }
.stat__rule { margin-bottom: 18px; }
.stat__head { display: flex; align-items: baseline; gap: 14px; }
.stat__num {
  font-family: var(--font-display); font-weight: 800; line-height: 0.9;
  letter-spacing: -0.03em; font-size: var(--fs-stat); color: var(--ink);
}
.stat__num sup { font-size: 0.3em; font-weight: 600; vertical-align: super; }
.stat__unit { color: var(--ink); }
.stat__desc { margin-top: 14px; max-width: 28ch; font-size: 0.8125rem; line-height: 1.5; color: var(--ink-soft); }
.stat--lg .stat__head { margin-bottom: 4px; }
.stat--lg .stat__unit { display: block; margin-top: 6px; }

/* ---------- WORKS ---------- */
.works__bar { display: flex; justify-content: space-between; align-items: center; gap: 20px; padding-top: 22px; }
.works__viewall { color: var(--ink); }
.works__title { font-size: clamp(2.8rem, 6.8vw, 5.75rem); color: var(--color-graphite); margin: clamp(8px, 1.5vw, 24px) 0 clamp(16px, 3vw, 40px); line-height: 0.84; }
.works__list { display: flex; flex-direction: column; }
.work {
  display: grid; grid-template-columns: minmax(200px, 290px) 1fr;
  gap: clamp(20px, 3vw, 56px); align-items: center;
  padding-block: clamp(18px, 2.4vw, 36px);
}
.work__meta { display: flex; flex-direction: column; gap: 10px; }
.work__index { color: var(--color-steel); }
.work__name { font-size: clamp(1.4rem, 2.4vw, 2.1rem); font-weight: 600; letter-spacing: -0.02em; line-height: 1.02; text-transform: uppercase; }
.work__tags { display: flex; flex-direction: column; gap: 5px; margin-top: 6px; color: var(--ink-soft); }
.work__media { position: relative; aspect-ratio: 16 / 6; overflow: hidden; background: var(--color-carbon); }
.work__media .media-img { transition: transform var(--dur-slow) var(--ease-out-expo); }
.work:hover .work__media .media-img { transform: scale(1.04); }

/* ---------- MATERIAL SPECIFICATION ---------- */
.spec__grid { display: grid; grid-template-columns: 0.9fr 1.05fr 0.8fr; gap: clamp(32px, 4vw, 72px); align-items: start; }
.spec__left { display: flex; flex-direction: column; gap: clamp(28px, 3vw, 48px); }
.spec__eyebrow { color: var(--ink-soft); }
.spec--lg { }
.spec__left .stat__num { font-size: clamp(3.5rem, 7vw, 6.5rem); }
.spec__coords { display: flex; flex-direction: column; gap: 14px; margin-top: clamp(8px, 1vw, 16px); padding-top: 20px; border-top: 1px solid var(--line); }
.spec__coord { display: flex; flex-direction: column; gap: 4px; }
.spec__coord dt { color: var(--ink-soft); }
.spec__coord dd { color: var(--ink); }
.spec__center { display: flex; flex-direction: column; gap: clamp(28px, 3vw, 44px); }
.spec__headline { font-size: clamp(1.35rem, 2vw, 2rem); font-weight: 600; line-height: 1.14; letter-spacing: -0.02em; color: var(--color-graphite); max-width: 24ch; }
.spec__legend { display: flex; flex-direction: column; }
.spec__item { display: grid; grid-template-columns: auto 1fr; gap: 20px; align-items: center; padding-block: 13px; border-top: 1px solid var(--line); }
.spec__item:last-child { border-bottom: 1px solid var(--line); }
.spec__item .mono { color: var(--color-steel); }
.spec__drawing { aspect-ratio: 2 / 3; overflow: hidden; }
/* Drawing is a transparent PNG (white keyed out), so it composites directly on
   concrete with no blend mode. Transparent areas show the concrete background. */
.spec__drawing .media-img { background: transparent; }

/* ---------- CONTACT ---------- */
.contact__grid { display: grid; grid-template-columns: 0.78fr 1.22fr; gap: clamp(40px, 5vw, 90px); align-items: start; }
.contact__diagram { aspect-ratio: 4 / 5; overflow: hidden; border: 1px solid var(--line); }
.contact__headline { color: var(--color-chalk); font-size: clamp(2rem, 4vw, 3.6rem); line-height: 1.0; }
.contact__lede { margin-top: clamp(18px, 2vw, 28px); display: flex; flex-direction: column; gap: 1em; max-width: 62ch; color: var(--ink-soft); }
.contact__lede .body-copy { max-width: none; }

/* form */
.form { margin-top: clamp(24px, 3vw, 40px); }
.form__legend { display: block; color: var(--color-smoke); padding-bottom: 16px; margin-bottom: 20px; border-bottom: 1px solid var(--line); }
.form__row { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(20px, 3vw, 48px); margin-bottom: 32px; }
.field { display: flex; flex-direction: column; gap: 10px; }
.field__label { color: var(--color-smoke); }
.field__input {
  width: 100%; background: transparent; border: 0; border-bottom: 1px solid var(--line);
  border-radius: 0; padding: 14px 0; color: var(--color-chalk); font-size: 1.0625rem;
  transition: border-color var(--dur-state) var(--ease-out-expo);
}
.field__input::placeholder { color: var(--color-smoke); opacity: 1; }
.field__input:focus { outline: none; border-bottom-color: var(--color-chalk); }
.field__input:focus-visible { outline: none; }
.field--select .field__control { position: relative; display: block; }
.field--select select { appearance: none; -webkit-appearance: none; padding-right: 28px; cursor: pointer; }
.field--select select option { background: var(--color-void); color: var(--color-chalk); }
.field__chev { position: absolute; right: 0; top: 50%; transform: translateY(-50%); pointer-events: none; color: var(--color-smoke); }
.field--full { margin-bottom: 40px; }
.form__actions { display: flex; align-items: center; gap: 28px; flex-wrap: wrap; }
.form__success { color: var(--color-smoke); font-size: var(--fs-label); letter-spacing: var(--tracking-label); text-transform: uppercase; }

/* ---------- FOOTER ---------- */
.footer { margin-top: clamp(40px, 5vw, 72px); padding-block: 32px; border-top: 1px solid var(--line); }
.footer__grid { display: flex; justify-content: space-between; align-items: center; gap: 20px; flex-wrap: wrap; }
.footer__social { display: flex; gap: 26px; }
.footer__social a { position: relative; }
.footer__social a::after { content: ""; position: absolute; left: 0; bottom: -4px; width: 0; height: 1px; background: currentColor; transition: width var(--dur-state) var(--ease-out-expo); }
.footer__social a:hover::after, .footer__social a:focus-visible::after { width: 100%; }

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */
@media (max-width: 1080px) {
  .spec__grid { grid-template-columns: 1fr 1fr; }
  .spec__drawing { grid-column: 1 / -1; aspect-ratio: 2 / 3; order: 3; width: 100%; max-width: 360px; justify-self: center; }
  .contact__grid { grid-template-columns: 1fr; }
  .contact__diagram { max-width: 420px; }
}

@media (max-width: 900px) {
  .nav__inner { grid-template-columns: 1fr auto; align-items: center; }
  .nav__hq { display: none; }
  .nav__links {
    position: fixed; inset: 0; width: 100vw; min-height: 100vh;
    flex-direction: column; align-items: flex-end; justify-content: flex-start;
    gap: 26px; padding: 112px 24px 32px; background: transparent; color: var(--color-chalk);
    text-align: right; justify-self: auto;
    transform: translateY(-100%); transition: transform var(--dur-slow) var(--ease-out-expo);
    mix-blend-mode: normal; z-index: 1;
  }
  .nav.is-open .nav__links { transform: translateY(0); }
  .nav.is-open .nav__links a { font-size: clamp(1.5rem, 7vw, 2.2rem); }
  .nav__links a { max-width: 100%; text-shadow: 0 0 18px rgba(0, 0, 0, 0.45); }
  .nav__toggle { display: inline-flex; position: relative; z-index: 2; }
  .nav.is-open .nav__toggle-bar { background: transparent; }
  .nav.is-open .nav__toggle-bar::before { transform: rotate(45deg); }
  .nav.is-open .nav__toggle-bar::after { transform: rotate(-45deg); }
  .hero { min-height: 94vh; }
  .hero__media { top: auto; bottom: 11%; right: 0; width: 70%; height: 38%; }
  .hero__stats { flex-direction: column; gap: 20px; margin-top: 20px; }
  .hero__title { font-size: clamp(2.3rem, 9vw, 3.9rem); }
  .hero__title .line--tight .line__in { font-size: 0.95em; }
  .hero__explore { margin-top: 18px; }
}

@media (max-width: 720px) {
  .nav__inner { padding-block: 20px; }
  .hero { min-height: 100svh; }
  .hero__inner {
    min-height: 100svh;
    justify-content: flex-start;
    padding-top: 128px;
    padding-bottom: 280px;
  }
  .spec__grid { grid-template-columns: 1fr; }
  .work { grid-template-columns: 1fr; gap: 18px; }
  .work__media { aspect-ratio: 16 / 9; }
  .form__row { grid-template-columns: 1fr; gap: 24px; margin-bottom: 24px; }
  .hero__media { width: 100%; opacity: 0.5; bottom: 0; height: 22%; }
  .hero__title { font-size: clamp(1.55rem, 8vw, 2.3rem); max-width: 7ch; }
  .hero__title .line--tight .line__in { font-size: 1em; letter-spacing: inherit; }
  .hero__stats { gap: 16px; max-width: 100%; margin-top: 20px; }
  .hero .stat { max-width: 100%; }
  .hero .stat__head { display: block; }
  .hero .stat__unit { display: block; margin-top: 8px; }
  .hero .stat__desc { margin-top: 10px; max-width: 24ch; font-size: 0.875rem; line-height: 1.45; }
  .hero__explore { width: 84px; height: 84px; margin-top: 20px; }
  .footer__grid { flex-direction: column; align-items: flex-start; gap: 16px; }
}

/* ==========================================================================
   MOTION — first-paint state for reveal targets (visible by default).
   GSAP sets the hidden "from" state at runtime only when motion is allowed,
   so content is never gated on JS or on a transition (per DESIGN.md).
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  .work__media .media-img { transition: none; }
}