/* ============================================================================
   Legacy of the Ark: Beneath the Broken Sky — website
   Look & feel mirrors the in-game uGUI shell: dark alloy panels, cyan "repair"
   accents, amber highlights, rust warnings. Self-contained, responsive, themed.
   ============================================================================ */

:root{
  --base:#0B1014; --base2:#080C10; --panel:#11181D; --panel2:#0E141A;
  --cyan:#55C7C9; --cyan-dim:#2C6E70; --amber:#D7A44A; --rust:#C45B47;
  --violet:#8B7FF0; --ink:#17130C;
  --text:#E9EEF2; --text-dim:#A8B3BC; --line:#22303A; --line2:#1A252E;
  --glow:0 0 24px rgba(85,199,201,.25);
  --shadow:0 10px 40px rgba(0,0,0,.55);
  --maxw:1240px; --nav-h:68px;
  --font-body:'Inter',system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;
  --font-head:'Rajdhani','Inter',system-ui,sans-serif;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--nav-h) + 12px)}
body{
  margin:0;background:var(--base);color:var(--text);font-family:var(--font-body);
  font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:var(--cyan);text-decoration:none;transition:color .2s}
a:hover{color:#8fe3e4}
h1,h2,h3,h4{font-family:var(--font-head);font-weight:700;line-height:1.12;margin:0 0 .4em;letter-spacing:.01em}
h2{font-size:clamp(1.8rem,3.6vw,3rem);text-transform:uppercase;letter-spacing:.06em}
h3{font-size:1.3rem;color:var(--text)}
.eyebrow{font-family:var(--font-head);text-transform:uppercase;letter-spacing:.32em;
  font-size:.8rem;color:var(--cyan);font-weight:600;margin-bottom:.6em}
.muted{color:var(--text-dim)}
.center{text-align:center}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
section{position:relative}
.section-pad{padding:clamp(64px,9vw,120px) 0}
.divider{height:1px;background:linear-gradient(90deg,transparent,var(--line),transparent)}

/* atmospheric background grain + vignette */
body::before{content:"";position:fixed;inset:0;pointer-events:none;z-index:0;
  background:radial-gradient(120% 80% at 50% -10%,rgba(85,199,201,.06),transparent 60%),
             radial-gradient(100% 60% at 50% 120%,rgba(139,127,240,.05),transparent 60%);}
main,header,footer{position:relative;z-index:1}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:.55em;font-family:var(--font-head);
  font-weight:600;letter-spacing:.06em;text-transform:uppercase;font-size:.95rem;
  padding:.85em 1.5em;border-radius:6px;border:1px solid transparent;cursor:pointer;
  transition:transform .15s,box-shadow .2s,background .2s,border-color .2s;white-space:nowrap}
.btn:hover{transform:translateY(-2px)}
.btn .ico{width:1.2em;height:1.2em}
.btn-primary{background:linear-gradient(180deg,#e7b962,#c98f34);color:var(--ink);
  box-shadow:0 6px 18px rgba(215,164,74,.28)}
.btn-primary:hover{color:var(--ink);box-shadow:0 10px 26px rgba(215,164,74,.42)}
.btn-steam{background:linear-gradient(180deg,#2a3f52,#16222e);color:#eaf3ff;
  border-color:#33566e;box-shadow:0 6px 20px rgba(30,60,90,.4)}
.btn-steam:hover{color:#fff;border-color:var(--cyan)}
.btn-ghost{background:rgba(85,199,201,.06);border-color:var(--cyan-dim);color:var(--cyan)}
.btn-ghost:hover{background:rgba(85,199,201,.13);border-color:var(--cyan);color:#bff}
.btn-lg{padding:1.05em 2em;font-size:1.05rem}

/* ---------- panels / frames (evoke the game 9-slice cards) ---------- */
.panel{position:relative;background:linear-gradient(180deg,var(--panel),var(--panel2));
  border:1px solid var(--line);border-radius:10px;box-shadow:var(--shadow)}
.panel.glow{border-color:var(--cyan-dim);box-shadow:var(--shadow),var(--glow)}
.frame{position:relative;border:1px solid var(--line);border-radius:10px;overflow:hidden}
.frame::after,.frame::before{content:"";position:absolute;width:16px;height:16px;
  border-color:var(--cyan);pointer-events:none;opacity:.7}
.frame::before{top:8px;left:8px;border-top:2px solid;border-left:2px solid}
.frame::after{bottom:8px;right:8px;border-bottom:2px solid;border-right:2px solid}

/* ---------- top nav ---------- */
.nav{position:fixed;top:0;left:0;right:0;height:var(--nav-h);z-index:50;
  display:flex;align-items:center;
  background:rgba(8,12,16,.55);backdrop-filter:blur(12px);
  border-bottom:1px solid transparent;transition:background .3s,border-color .3s}
.nav.scrolled{background:rgba(8,12,16,.9);border-color:var(--line2)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;width:100%}
.nav-logo{display:flex;align-items:center;gap:10px;font-family:var(--font-head);
  font-weight:700;letter-spacing:.04em;color:var(--text);text-transform:uppercase;font-size:1.02rem}
.nav-logo img{height:34px;width:auto}
.nav-links{display:flex;align-items:center;gap:6px}
.nav-links a{font-family:var(--font-head);text-transform:uppercase;letter-spacing:.08em;
  font-size:.86rem;font-weight:600;color:var(--text-dim);padding:.5em .8em;border-radius:6px}
.nav-links a:hover,.nav-links a.active{color:var(--cyan);background:rgba(85,199,201,.08)}
.nav-cta{margin-left:6px}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;padding:8px}
.nav-toggle span{display:block;width:24px;height:2px;background:var(--text);margin:5px 0;transition:.25s}

/* ---------- hero ---------- */
.hero{min-height:100vh;display:flex;align-items:center;justify-content:center;
  text-align:center;overflow:hidden;padding:calc(var(--nav-h) + 40px) 0 60px}
.hero-bg{position:absolute;inset:0;z-index:-2;background-size:cover;background-position:center;
  transform:scale(1.08);filter:saturate(1.05)}
.hero-bg::after{content:"";position:absolute;inset:0;
  background:radial-gradient(90% 90% at 50% 30%,rgba(11,16,20,.35),var(--base) 78%),
             linear-gradient(180deg,rgba(11,16,20,.6),rgba(11,16,20,.2) 40%,var(--base))}
.hero-inner{max-width:900px;padding:0 24px;animation:rise 1s ease both}
.hero-logo{max-width:min(620px,86vw);margin:0 auto 18px;filter:drop-shadow(0 8px 30px rgba(0,0,0,.6))}
.hero h1{font-size:clamp(1.2rem,2.4vw,1.7rem);letter-spacing:.34em;text-transform:uppercase;
  color:var(--cyan);font-weight:600;margin-bottom:.8em}
.hero p.lede{font-size:clamp(1.05rem,2vw,1.35rem);color:var(--text);max-width:680px;margin:0 auto 1.8em}
.hero-cta{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.hero-meta{margin-top:28px;display:flex;gap:22px;justify-content:center;flex-wrap:wrap;
  color:var(--text-dim);font-size:.85rem;font-family:var(--font-head);letter-spacing:.12em;text-transform:uppercase}
.hero-meta span{display:inline-flex;align-items:center;gap:8px}
.hero-meta .dot{width:6px;height:6px;border-radius:50%;background:var(--cyan)}
.scroll-cue{position:absolute;bottom:26px;left:50%;transform:translateX(-50%);
  color:var(--text-dim);font-size:.72rem;letter-spacing:.3em;text-transform:uppercase;animation:bob 2s ease-in-out infinite}

/* ---------- section headers with banner art ---------- */
.sec-head{text-align:center;margin-bottom:clamp(36px,5vw,64px)}
.sec-banner{max-height:96px;width:auto;margin:0 auto 10px;opacity:.96;
  filter:drop-shadow(0 6px 20px rgba(0,0,0,.5))}
.sec-head p{max-width:660px;margin:.4em auto 0;color:var(--text-dim)}

/* ---------- feature grid (systems) ---------- */
.feature-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:20px}
.feature{padding:26px 24px;border-radius:12px;transition:transform .2s,border-color .2s,box-shadow .2s}
.feature:hover{transform:translateY(-4px);border-color:var(--cyan-dim);box-shadow:var(--shadow),var(--glow)}
.feature .ficon{width:56px;height:56px;margin-bottom:16px;filter:drop-shadow(0 4px 10px rgba(0,0,0,.5))}
.feature h3{margin-bottom:.35em}
.feature p{color:var(--text-dim);font-size:.96rem;margin:0}
.feature .tag{display:inline-block;margin-top:14px;font-family:var(--font-head);font-size:.72rem;
  letter-spacing:.14em;text-transform:uppercase;color:var(--cyan);border:1px solid var(--cyan-dim);
  padding:.25em .7em;border-radius:20px}

/* ---------- pillars strip ---------- */
.pillars{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:18px}
.pillar{padding:22px;border-radius:10px;border-left:3px solid var(--cyan)}
.pillar h3{font-size:1.1rem;color:var(--cyan);letter-spacing:.04em}
.pillar p{margin:0;color:var(--text-dim);font-size:.92rem}

/* ---------- world march ---------- */
.world-track{display:grid;grid-auto-flow:column;grid-auto-columns:minmax(230px,1fr);gap:16px;
  overflow-x:auto;padding:8px 4px 22px;scroll-snap-type:x mandatory}
.world-track::-webkit-scrollbar{height:10px}
.world-track::-webkit-scrollbar-thumb{background:var(--cyan-dim);border-radius:8px}
.region{scroll-snap-align:start;border-radius:12px;overflow:hidden;cursor:pointer;
  transition:transform .2s,box-shadow .2s;position:relative}
.region:hover{transform:translateY(-4px);box-shadow:var(--shadow),var(--glow)}
.region img{aspect-ratio:16/10;object-fit:cover;width:100%}
.region .cap{position:absolute;inset:auto 0 0 0;padding:14px 16px;
  background:linear-gradient(0deg,rgba(8,12,16,.92),transparent)}
.region .cap .idx{font-family:var(--font-head);font-size:.72rem;letter-spacing:.2em;color:var(--cyan)}
.region .cap h4{margin:.1em 0 0;font-size:1.05rem}
.region.locked{filter:grayscale(.5) brightness(.7)}
.region.locked::after{content:"";position:absolute;top:12px;right:12px;width:26px;height:26px;
  background:url(../assets/game/icon_lock.png) center/contain no-repeat;opacity:.85}

/* ---------- story timeline ---------- */
.timeline{position:relative;max-width:860px;margin:0 auto;padding-left:34px}
.timeline::before{content:"";position:absolute;left:9px;top:6px;bottom:6px;width:2px;
  background:linear-gradient(180deg,var(--cyan),var(--violet))}
.tl-item{position:relative;margin-bottom:34px}
.tl-item::before{content:"";position:absolute;left:-33px;top:4px;width:18px;height:18px;border-radius:50%;
  background:var(--base);border:2px solid var(--cyan);box-shadow:var(--glow)}
.tl-item h3{margin-bottom:.2em}
.tl-item .when{font-family:var(--font-head);letter-spacing:.16em;text-transform:uppercase;
  font-size:.74rem;color:var(--amber);margin-bottom:.3em}
.tl-item p{color:var(--text-dim);margin:0}

/* ---------- interactive demo (try the loop) ---------- */
.demo{display:grid;grid-template-columns:1.1fr .9fr;gap:26px;align-items:center}
.demo-stage{padding:26px;border-radius:14px}
.res-row{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:18px}
.res-chip{display:flex;align-items:center;gap:10px;background:var(--panel2);border:1px solid var(--line);
  border-radius:8px;padding:10px 14px;min-width:150px}
.res-chip img{width:30px;height:30px}
.res-chip b{font-family:var(--font-head);font-size:1.15rem;display:block;line-height:1}
.res-chip small{color:var(--text-dim);font-size:.72rem;letter-spacing:.1em;text-transform:uppercase}
.gather-row{display:flex;gap:12px;flex-wrap:wrap}
.gbtn{display:flex;flex-direction:column;align-items:center;gap:6px;background:rgba(85,199,201,.06);
  border:1px solid var(--cyan-dim);border-radius:10px;padding:14px 18px;cursor:pointer;
  font-family:var(--font-head);letter-spacing:.06em;text-transform:uppercase;font-size:.8rem;color:var(--cyan);
  transition:transform .08s,background .2s;user-select:none}
.gbtn:hover{background:rgba(85,199,201,.14)}
.gbtn:active{transform:scale(.94)}
.gbtn img{width:38px;height:38px}
.demo-log{margin-top:16px;min-height:1.4em;color:var(--amber);font-family:var(--font-head);letter-spacing:.04em}
.demo-side p{color:var(--text-dim)}
.progress{height:10px;border-radius:6px;background:var(--panel2);border:1px solid var(--line);overflow:hidden;margin:10px 0}
.progress i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--cyan),var(--violet));transition:width .3s}

/* ---------- gallery / lightbox ---------- */
.gallery{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:16px}
.shot{border-radius:12px;overflow:hidden;cursor:pointer;position:relative;border:1px solid var(--line)}
.shot img{aspect-ratio:16/9;object-fit:cover;transition:transform .35s}
.shot:hover img{transform:scale(1.06)}
.shot .lbl{position:absolute;left:12px;bottom:10px;font-family:var(--font-head);letter-spacing:.1em;
  text-transform:uppercase;font-size:.78rem;text-shadow:0 2px 8px #000}
.lightbox{position:fixed;inset:0;z-index:100;background:rgba(4,7,10,.92);display:none;
  align-items:center;justify-content:center;padding:30px}
.lightbox.open{display:flex}
.lightbox img{max-width:92vw;max-height:86vh;border-radius:10px;box-shadow:var(--shadow)}
.lightbox .close{position:absolute;top:18px;right:24px;font-size:2rem;color:var(--text);cursor:pointer;font-family:var(--font-head)}

/* ---------- community ---------- */
.links-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:14px}
.link-card{display:flex;align-items:center;gap:14px;padding:18px 20px;border-radius:10px;
  transition:transform .2s,border-color .2s,box-shadow .2s}
.link-card:hover{transform:translateY(-3px);border-color:var(--cyan-dim);box-shadow:var(--glow)}
.link-card .lc-ico{width:40px;height:40px;flex:none;display:grid;place-items:center;border-radius:8px;
  background:rgba(85,199,201,.1);color:var(--cyan);font-family:var(--font-head);font-weight:700}
.link-card b{font-family:var(--font-head);letter-spacing:.04em;text-transform:uppercase;font-size:.95rem}
.link-card small{color:var(--text-dim)}

/* ---------- final CTA ---------- */
.cta-band{text-align:center;border-radius:16px;padding:clamp(40px,6vw,72px) 24px;overflow:hidden;position:relative}
.cta-band .cta-bg{position:absolute;inset:0;z-index:-1;background-size:cover;background-position:center;opacity:.35}
.cta-band::after{content:"";position:absolute;inset:0;z-index:-1;background:linear-gradient(180deg,rgba(11,16,20,.75),rgba(11,16,20,.92))}

/* ---------- footer ---------- */
.footer{border-top:1px solid var(--line2);padding:48px 0 40px;background:var(--base2)}
.footer .wrap{display:flex;flex-wrap:wrap;gap:24px;justify-content:space-between;align-items:center}
.footer img{height:40px;opacity:.9}
.footer .fnav{display:flex;gap:18px;flex-wrap:wrap}
.footer .fnav a{color:var(--text-dim);font-size:.86rem}
.footer small{color:var(--text-dim);display:block;margin-top:10px}

/* ---------- codex ---------- */
.codex-shell{display:grid;grid-template-columns:280px 1fr;gap:28px;
  max-width:var(--maxw);margin:0 auto;padding:calc(var(--nav-h) + 40px) 24px 80px;align-items:start}
.codex-side{position:sticky;top:calc(var(--nav-h) + 24px);align-self:start}
.codex-search{width:100%;background:var(--panel2);border:1px solid var(--line);border-radius:8px;
  color:var(--text);padding:12px 14px;font-family:var(--font-body);font-size:.95rem;margin-bottom:14px}
.codex-search:focus{outline:none;border-color:var(--cyan);box-shadow:var(--glow)}
.cat-list{list-style:none;margin:0;padding:0;max-height:70vh;overflow:auto}
.cat-list li{margin:0}
.cat-list button{width:100%;text-align:left;background:none;border:0;color:var(--text-dim);cursor:pointer;
  font-family:var(--font-head);letter-spacing:.05em;text-transform:uppercase;font-size:.82rem;
  padding:.6em .8em;border-radius:6px;display:flex;align-items:center;gap:10px;transition:.15s}
.cat-list button:hover{color:var(--text);background:rgba(85,199,201,.06)}
.cat-list button.active{color:var(--cyan);background:rgba(85,199,201,.1)}
.cat-list button .ci{width:20px;height:20px;flex:none}
.cat-list button .cc{margin-left:auto;font-size:.72rem;color:var(--text-dim)}
.codex-main{min-width:0}
.codex-intro{margin-bottom:26px}
.entry{scroll-margin-top:calc(var(--nav-h) + 20px);margin-bottom:18px;border-radius:12px;overflow:hidden}
.entry summary{list-style:none;cursor:pointer;display:flex;align-items:center;gap:14px;padding:18px 20px}
.entry summary::-webkit-details-marker{display:none}
.entry summary .ei{width:38px;height:38px;flex:none}
.entry summary h3{margin:0;font-size:1.1rem}
.entry summary .ecat{margin-left:auto;font-family:var(--font-head);font-size:.7rem;letter-spacing:.12em;
  text-transform:uppercase;color:var(--cyan);border:1px solid var(--cyan-dim);padding:.2em .6em;border-radius:20px}
.entry summary .chev{margin-left:10px;color:var(--text-dim);transition:transform .2s}
.entry[open] summary .chev{transform:rotate(90deg)}
.entry .body{padding:0 22px 22px 72px}
.entry .body p{margin:.2em 0 .8em;color:var(--text-dim)}
.entry .body ul{margin:.2em 0 .8em;padding-left:18px;color:var(--text-dim)}
.entry .body code,.formula{font-family:'JetBrains Mono',ui-monospace,Menlo,Consolas,monospace;
  background:var(--base2);border:1px solid var(--line);border-radius:6px;color:#cfe;
  padding:.15em .45em;font-size:.86em}
.formula{display:block;padding:12px 14px;margin:.4em 0;white-space:pre-wrap;line-height:1.5;color:#bfe}
.entry .body .rel{margin-top:8px;font-size:.85rem}
.entry .body .rel a{margin-right:12px}
.no-results{padding:40px;text-align:center;color:var(--text-dim)}
.codex-hero{border-radius:14px;overflow:hidden;position:relative;margin-bottom:26px}
.codex-hero img{width:100%;aspect-ratio:21/6;object-fit:cover;opacity:.7}
.codex-hero .ch-txt{position:absolute;inset:0;display:flex;flex-direction:column;justify-content:center;padding:0 32px;
  background:linear-gradient(90deg,rgba(8,12,16,.9),transparent)}

/* ---------- animations ---------- */
@keyframes rise{from{opacity:0;transform:translateY(24px)}to{opacity:1;transform:none}}
@keyframes bob{0%,100%{transform:translate(-50%,0)}50%{transform:translate(-50%,8px)}}
.reveal{opacity:0;transform:translateY(28px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}
  .reveal{opacity:1;transform:none}}

/* ---------- responsive ---------- */
@media (max-width:920px){
  .demo{grid-template-columns:1fr}
  .codex-shell{grid-template-columns:1fr}
  .codex-side{position:static;top:auto}
  .cat-list{display:flex;flex-wrap:wrap;max-height:none}
  .cat-list button .cc{display:none}
}
@media (max-width:760px){
  .nav-links{position:fixed;top:var(--nav-h);left:0;right:0;flex-direction:column;align-items:stretch;
    gap:0;background:rgba(8,12,16,.98);border-bottom:1px solid var(--line);padding:10px 16px;
    transform:translateY(-140%);transition:transform .3s;box-shadow:var(--shadow)}
  .nav-links.open{transform:none}
  .nav-links a{padding:.9em .6em;border-radius:0;border-bottom:1px solid var(--line2)}
  .nav-toggle{display:block}
  .nav-cta{display:none}
  .entry .body{padding-left:22px}
  .footer .wrap{flex-direction:column;text-align:center}
}