/* Theme layer for the Civil Engineer demo portfolio.
   Engine rules live in scene.css / filmtype.css; this file only themes. */

@font-face{font-family:"Anton";src:url("assets/fonts/anton-400.woff2") format("woff2");font-weight:400;font-display:swap}
@font-face{font-family:"Source Sans 3";src:url("assets/fonts/source-sans-3-400.woff2") format("woff2");font-weight:400;font-display:swap}
@font-face{font-family:"Source Sans 3";src:url("assets/fonts/source-sans-3-600.woff2") format("woff2");font-weight:600;font-display:swap}
@font-face{font-family:"Plex Mono";src:url("assets/fonts/plex-mono-400.woff2") format("woff2");font-weight:400;font-display:swap}
@font-face{font-family:"Plex Mono";src:url("assets/fonts/plex-mono-500.woff2") format("woff2");font-weight:500;font-display:swap}

:root{
  --canvas:#14161a;
  --panel:#1c1f24;
  --accent:#e8873a;
  --accent-hover:#ffa154;
  --accent-muted:rgba(232,135,58,.22);
  --text-secondary:#a9aeb6;
  --text-primary:#edeff2;
  --display:"Anton",Impact,"Arial Narrow",sans-serif;
  --body:"Source Sans 3",system-ui,-apple-system,Segoe UI,sans-serif;
  --mono:"Plex Mono",ui-monospace,Consolas,monospace;
  --measure:65ch;
  --gutter:clamp(20px,6vw,96px);
  --line:rgba(237,239,242,.14);
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{
  margin:0;background:var(--canvas);color:var(--text-primary);
  font:400 18px/1.6 var(--body);-webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img,svg,video{display:block;max-width:100%}
a{color:inherit}

.skip{
  position:absolute;left:-999px;top:0;z-index:100;padding:1.1rem 1.4rem;
  background:var(--accent);color:#14161a;font:500 14px/1.2 var(--mono);
}
.skip:focus{left:0}

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

/* cinematic vignette over the film, under the captions */
.k-stage::after{
  content:"";position:absolute;inset:0;z-index:2;pointer-events:none;
  background:radial-gradient(130% 95% at 50% 42%,transparent 54%,rgba(6,7,9,.36) 100%);
}

/* ---------- shared type ---------- */
.eyebrow,.label,.station{
  font:500 13px/1.2 var(--mono);letter-spacing:.14em;text-transform:uppercase;
  color:var(--text-secondary);margin:0 0 1rem;
}
.label{color:var(--accent);margin:0 0 .5rem}
.section__head{
  font:400 clamp(34px,4.6vw,64px)/1.02 var(--display);
  letter-spacing:-.005em;margin:0 0 clamp(1.5rem,3vw,2.75rem);
  max-width:18ch;
}
.section{
  padding:clamp(4.5rem,10vh,8rem) var(--gutter);
  border-top:1px solid var(--line);
  scroll-margin-top:72px;
}

/* ---------- buttons ---------- */
.btn{
  display:inline-block;padding:.85rem 1.6rem;border:1px solid var(--accent);
  background:linear-gradient(180deg,#f4994d 0%,#e8873a 55%,#dd7d31 100%);
  color:#14161a;text-decoration:none;
  font:500 13px/1 var(--mono);letter-spacing:.14em;text-transform:uppercase;
  box-shadow:0 8px 22px rgba(232,135,58,.26),inset 0 1px 0 rgba(255,255,255,.32);
  transition:background .2s var(--k-ease),border-color .2s var(--k-ease),
             box-shadow .25s var(--k-ease),transform .2s var(--k-ease);
}
.btn:hover{
  background:linear-gradient(180deg,#ffb169 0%,#ffa154 55%,#f4913f 100%);
  border-color:var(--accent-hover);
  box-shadow:0 12px 30px rgba(232,135,58,.4),inset 0 1px 0 rgba(255,255,255,.38);
}
.btn:active{transform:translateY(1px);box-shadow:0 4px 12px rgba(232,135,58,.3)}
.btn--small{padding:.6rem 1rem;box-shadow:0 5px 14px rgba(232,135,58,.22),inset 0 1px 0 rgba(255,255,255,.3)}

/* ---------- nav ---------- */
.nav{
  position:fixed;inset:0 0 auto;z-index:50;
  display:flex;align-items:center;gap:1.5rem;
  padding:1rem var(--gutter);
  background:linear-gradient(to bottom,rgba(20,22,26,.85),rgba(20,22,26,0));
  transition:background .4s var(--k-ease),border-color .4s var(--k-ease),
             box-shadow .4s var(--k-ease),padding .4s var(--k-ease);
}
.nav.is-solid{
  background:rgba(20,22,26,.92);
  -webkit-backdrop-filter:blur(14px) saturate(1.3);
  backdrop-filter:blur(14px) saturate(1.3);
  border-bottom:1px solid var(--line);
  box-shadow:0 10px 34px rgba(0,0,0,.38);
  padding-top:.7rem;padding-bottom:.7rem;
}
.nav__brand{
  font:500 13px/1.2 var(--mono);letter-spacing:.14em;text-transform:uppercase;
  text-decoration:none;display:flex;flex-direction:column;gap:.2rem;
  padding:.6rem 0;
}
.nav__role{color:rgba(237,239,242,.94);font-weight:400}
.nav__menu{margin-left:auto;display:flex;align-items:center;gap:1.5rem}
.nav__menu a:not(.btn){
  font:400 15px/1 var(--body);text-decoration:none;color:var(--text-primary);
}
.nav__menu a:not(.btn):hover{color:var(--accent)}
.nav__toggle{
  display:none;margin-left:auto;background:none;border:1px solid var(--line);
  color:var(--text-primary);padding:.85rem 1.15rem;cursor:pointer;
  font:500 12px/1 var(--mono);letter-spacing:.14em;text-transform:uppercase;
}
@media (max-width:760px){
  .nav__toggle{display:block}
  .nav__menu{
    position:absolute;right:var(--gutter);top:calc(100% + .35rem);
    flex-direction:column;align-items:stretch;gap:0;
    background:rgba(28,31,36,.97);border:1px solid var(--line);
    padding:.5rem;min-width:14rem;display:flex;
    opacity:0;visibility:hidden;pointer-events:none;
    transform:translateY(-8px) scale(.98);transform-origin:top right;
    transition:opacity .28s var(--k-ease),transform .28s var(--k-ease),visibility .28s;
    box-shadow:0 18px 44px rgba(0,0,0,.45);
  }
  .nav.is-open .nav__menu{
    opacity:1;visibility:visible;pointer-events:auto;transform:none;
  }
  .nav__menu a:not(.btn){padding:.85rem 1rem;transition:background .2s var(--k-ease),color .2s var(--k-ease)}
  .nav__menu a:not(.btn):hover{background:rgba(237,239,242,.06)}
  .nav__menu .btn{margin:.5rem;text-align:center}
}

/* ---------- hero ---------- */
.hero{height:500vh}
.hero__line{
  font:400 clamp(54px,8.6vw,132px)/.94 var(--display);
  letter-spacing:-.005em;margin:0;text-wrap:balance;
  text-shadow:0 2px 24px rgba(0,0,0,.55),0 1px 2px rgba(0,0,0,.6);
}
.k-band .hero__line{max-width:14ch}
.hero__sub{
  font:400 clamp(17px,1.5vw,21px)/1.5 var(--body);
  color:var(--text-primary);margin:1.1rem 0 1.5rem;max-width:38ch;
  text-shadow:0 1px 12px rgba(0,0,0,.6);
}
/* final band carries headline + sub + CTA: keep it clear of the fixed nav */
.k-band[data-k-band^="0.68"] .hero__line{
  font-size:clamp(40px,6.2vw,92px);
  line-height:1.22;
  max-width:none;
  text-wrap:wrap;
}
.k-band[data-k-band^="0.68"] .hero__sub{margin:.85rem 0 1.15rem}
.k-band{max-width:min(52rem,86vw)}
/* per-band legibility: a lower-third scrim that rides the band's own opacity,
   deepening the worst frame to well past 3.5:1 */
.hero .k-band{
  padding:1.4rem 2rem 1.6rem;
  margin-left:-2rem;
  background:linear-gradient(100deg,
    rgba(8,9,11,.82) 0%,
    rgba(8,9,11,.66) 52%,
    rgba(8,9,11,.18) 86%,
    rgba(8,9,11,0) 100%);
}

/* ---------- work ---------- */
.work{
  background:
    radial-gradient(90% 55% at 12% 0%,rgba(232,135,58,.055),transparent 60%),
    linear-gradient(180deg,#14161a 0%,#171a20 55%,#14161a 100%);
}
.work__list{list-style:none;margin:0;padding:0;display:grid;gap:clamp(2rem,5vw,4rem)}
.card{
  display:grid;grid-template-columns:1.25fr .9fr;gap:clamp(1.25rem,3vw,2.5rem);
  align-items:center;
}
.card--flip{grid-template-columns:.9fr 1.25fr}
.card--flip .card__media{order:2}
.card__media{
  position:relative;margin:0;overflow:hidden;border:1px solid var(--line);
  background:linear-gradient(160deg,#20242b,#171a1f);
  box-shadow:0 18px 44px rgba(0,0,0,.34);
  transition:box-shadow .45s var(--k-ease),border-color .45s var(--k-ease);
}
.card__media::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(to top,rgba(10,11,13,.4),rgba(10,11,13,0) 45%);
}
.card:hover .card__media{
  box-shadow:0 28px 64px rgba(0,0,0,.5),0 0 0 1px rgba(232,135,58,.22);
  border-color:rgba(232,135,58,.35);
}
.card__media img{
  width:100%;height:auto;aspect-ratio:16/9;object-fit:cover;
  transition:transform .7s var(--k-ease);
}
.card:hover .card__media img{transform:scale(1.025)}
.card__body h3{
  font:400 clamp(26px,2.6vw,38px)/1.05 var(--display);
  letter-spacing:-.005em;margin:0 0 1.1rem;
}
.facts{margin:0;display:grid;grid-template-columns:auto 1fr;gap:.45rem 1.25rem}
.facts dt{
  font:500 12px/1.5 var(--mono);letter-spacing:.14em;text-transform:uppercase;
  color:var(--text-secondary);padding-top:.15rem;
}
.facts dd{margin:0;color:var(--text-primary);max-width:40ch}
@media (max-width:820px){
  .card,.card--flip{grid-template-columns:1fr}
  .card--flip .card__media{order:0}
}

/* ---------- method ---------- */
.method{
  background:
    radial-gradient(70% 45% at 85% 10%,rgba(232,135,58,.05),transparent 65%),
    linear-gradient(180deg,#14161a,#16181d 50%,#14161a);
}
.method__track{position:relative;padding-left:clamp(2.5rem,6vw,5rem)}
.method__line{
  position:absolute;left:0;top:0;bottom:0;width:4px;height:100%;
  overflow:visible;color:var(--accent);
  filter:drop-shadow(0 0 7px rgba(232,135,58,.45));
}
.method__line line{
  stroke:currentColor;stroke-width:2;vector-effect:non-scaling-stroke;
  stroke-dasharray:1;stroke-dashoffset:1;
}
.method__line.is-in line{transition:stroke-dashoffset .1s linear}
.steps{list-style:none;margin:0;padding:0;display:grid;gap:clamp(2.5rem,6vh,4.5rem)}
.step{position:relative;max-width:52ch}
.step::before{
  content:"";position:absolute;left:calc(-1 * clamp(2.5rem,6vw,5rem) - 1px);
  top:.55rem;width:clamp(1.6rem,3.5vw,2.6rem);height:2px;background:var(--accent);
  box-shadow:0 0 10px rgba(232,135,58,.55);
}
.step h3{
  font:400 clamp(24px,2.4vw,34px)/1.08 var(--display);
  letter-spacing:-.005em;margin:.15rem 0 .5rem;
}
.step p{margin:0;color:var(--text-secondary);max-width:44ch}
.station{margin:0;color:var(--accent)}

/* ---------- ground ---------- */
.ground{
  background:linear-gradient(180deg,#14161a 0%,#16191e 50%,#14161a 100%);
}
.ground__cols{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(15rem,1fr));
  gap:clamp(1.5rem,4vw,3.5rem);
}
.ground__cols ul{list-style:none;margin:0;padding:0;border-top:1px solid var(--line)}
.ground__cols li{
  padding:.85rem 0;border-bottom:1px solid var(--line);
  display:flex;align-items:baseline;gap:.85rem;
}
.ground__cols li::before{
  content:"";flex:0 0 14px;height:1px;background:var(--accent);opacity:.7;
  transform:translateY(-.35em);
}
.ground__tools li{font:400 16px/1.4 var(--mono);letter-spacing:.02em}

/* ---------- about ---------- */
.about{
  background:
    radial-gradient(80% 50% at 90% 100%,rgba(232,135,58,.05),transparent 60%),
    linear-gradient(180deg,#14161a,#17191e 50%,#14161a);
}
.about__grid{display:grid;grid-template-columns:1.1fr .9fr;gap:clamp(1.5rem,4vw,3.5rem);align-items:center}
.about__media{
  position:relative;margin:0;overflow:hidden;border:1px solid var(--line);
  background:linear-gradient(160deg,#20242b,#171a1f);
  box-shadow:0 22px 54px rgba(0,0,0,.4);
}
.about__media::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(to top,rgba(10,11,13,.35),transparent 50%);
}
.about__media img{width:100%;height:auto;aspect-ratio:16/9;object-fit:cover}
.lede{margin:0 0 1.75rem;max-width:var(--measure);font-size:clamp(18px,1.6vw,21px)}
.creds{list-style:none;margin:0;padding:0;border-top:1px solid var(--line)}
.creds li{padding:.7rem 0;border-bottom:1px solid var(--line);color:var(--text-secondary)}
.creds li.label{color:var(--accent)}
@media (max-width:820px){.about__grid{grid-template-columns:1fr}}

/* ---------- contact ---------- */
.form{
  display:grid;grid-template-columns:1fr 1fr;gap:1.25rem 1.5rem;
  max-width:48rem;align-items:end;
}
.field{display:flex;flex-direction:column;gap:.45rem}
.field--wide,.form__note,.form__status{grid-column:1/-1}
.form label{
  font:500 12px/1 var(--mono);letter-spacing:.14em;text-transform:uppercase;
  color:var(--text-secondary);
}
.form input,.form select,.form textarea{
  background:linear-gradient(180deg,#1e2228,#191c21);
  border:1px solid var(--line);color:var(--text-primary);
  font:400 17px/1.4 var(--body);padding:.75rem .9rem;border-radius:0;
  box-shadow:inset 0 1px 3px rgba(0,0,0,.35);
  transition:border-color .2s var(--k-ease),box-shadow .25s var(--k-ease);
}
.form input::placeholder,.form textarea::placeholder{color:rgba(169,174,182,.55)}
.form input:focus,.form select:focus,.form textarea:focus{
  border-color:var(--accent);outline:none;
  box-shadow:inset 0 1px 3px rgba(0,0,0,.35),0 0 0 3px rgba(232,135,58,.18);
}
.form textarea{resize:vertical;min-height:7rem}
.form__note{margin:0;font:400 15px/1.5 var(--body);color:var(--text-secondary)}
.form__status{margin:0;font:500 13px/1.4 var(--mono);letter-spacing:.08em;color:var(--accent);min-height:1.2em}
.form .btn{justify-self:start}
@media (max-width:640px){.form{grid-template-columns:1fr}}

/* ---------- footer ---------- */
.footer{
  padding:clamp(2.5rem,6vh,4rem) var(--gutter);
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,#14161a 0%,#101216 100%);
}
.footer__line{
  margin:0;max-width:60ch;color:var(--text-secondary);font-size:16px;
}

/* ---------- back to top ---------- */
.totop{
  position:fixed;right:clamp(16px,3vw,32px);bottom:clamp(16px,3vw,32px);z-index:60;
  width:48px;height:48px;display:grid;place-items:center;
  background:linear-gradient(180deg,rgba(34,38,45,.95),rgba(24,27,32,.95));
  border:1px solid var(--line);
  color:var(--text-primary);cursor:pointer;
  -webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);
  box-shadow:0 12px 30px rgba(0,0,0,.45),inset 0 1px 0 rgba(255,255,255,.06);
  opacity:0;visibility:hidden;transform:translateY(14px);
  transition:opacity .32s var(--k-ease),transform .32s var(--k-ease),
             visibility .32s,border-color .2s var(--k-ease),color .2s var(--k-ease),
             box-shadow .25s var(--k-ease);
}
.totop.is-visible{opacity:1;visibility:visible;transform:none}
.totop:hover{
  border-color:var(--accent);color:var(--accent);
  box-shadow:0 14px 34px rgba(0,0,0,.5),0 0 18px rgba(232,135,58,.28);
}
.totop:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
@media (prefers-reduced-motion:reduce){.totop{transition:none}}

/* ---------- reveal hooks (engine sets .k-on / [data-k-in]) ----------
   .js is set by an inline script before first paint so above-fold
   elements never flash visible-then-hidden. */
.section [data-k-in],
.footer [data-k-in]{
  transition:opacity .85s var(--k-ease),transform .85s var(--k-ease);
  transition-delay:calc(var(--d, 0) * 110ms);
}
.js .section [data-k-in],
.js .footer [data-k-in]{opacity:0;transform:translateY(26px)}
.js .section [data-k-in].is-in,
.js .footer [data-k-in].is-in{opacity:1;transform:none}

@media (prefers-reduced-motion:reduce){
  .js .section [data-k-in],
  .js .footer [data-k-in]{opacity:1;transform:none;transition:none}
  .card:hover .card__media img{transform:none}
  .method__line line{stroke-dashoffset:0}
  .nav{transition:none}
}