/* Battle City Online — Levels hub ( /levels/ , /ru/levels/ ).
   Loaded ONLY on the levels pages (after style.css). Vanilla CSS, no framework. */

/* ---------- shared utilities ---------- */
.bc-vh{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.bc-eyebrow{font-family:'IBM Plex Mono',monospace;font-size:11.5px;font-weight:600;letter-spacing:.2em;text-transform:uppercase;color:#E9B72C;margin:0 0 12px}
#bc-levels img,.bc-viewer img{image-rendering:pixelated;image-rendering:crisp-edges}

/* ---------- CTA buttons ---------- */
.bc-cta{display:inline-flex;align-items:center;gap:9px;cursor:pointer;background:#E9B72C;color:#101112;
  font-family:Oswald,sans-serif;font-weight:600;font-size:14px;letter-spacing:.09em;text-transform:uppercase;
  padding:11px 22px;border:0;border-radius:5px;box-shadow:0 0 0 1px rgba(233,183,44,.35),0 12px 34px rgba(233,183,44,.14);
  transition:transform .16s,box-shadow .16s,background .16s;text-decoration:none}
.bc-cta:hover{background:#F3C441;color:#101112;transform:translateY(-1px);box-shadow:0 0 0 1px rgba(233,183,44,.55),0 16px 46px rgba(233,183,44,.24)}
.bc-cta:active{transform:translateY(1px)}
.bc-cta-big{font-size:clamp(15px,1.5vw,18px);padding:14px clamp(26px,3vw,40px);letter-spacing:.1em}
.bc-cta-ghost{background:transparent;color:#C9CDD2;border:1px solid rgba(255,255,255,.16);box-shadow:none}
.bc-cta-ghost:hover{background:rgba(255,255,255,.04);color:#E9B72C;border-color:rgba(233,183,44,.5);box-shadow:none}

/* ---------- header ---------- */
.bc-lv-header{position:sticky;top:0;z-index:50;background:rgba(10,11,13,.9);backdrop-filter:blur(10px);border-bottom:1px solid rgba(255,255,255,.07)}
.bc-lv-header-in{max-width:1400px;margin:0 auto;height:52px;padding:0 clamp(14px,3vw,32px);display:flex;align-items:center;gap:clamp(12px,2.4vw,30px)}
.bc-lv-logo{display:flex;align-items:center;gap:9px;flex:0 0 auto;color:inherit;text-decoration:none}
.bc-lv-logo-mark{width:22px;height:22px;background:linear-gradient(180deg,#2C3238,#181C20);border:1px solid rgba(255,255,255,.12);border-radius:3px;display:grid;grid-template-columns:repeat(3,1fr);grid-template-rows:repeat(3,1fr);gap:2px;padding:3px}
.bc-lv-logo-mark span{background:transparent}
.bc-lv-logo-mark span:nth-child(1),.bc-lv-logo-mark span:nth-child(3),.bc-lv-logo-mark span:nth-child(4),.bc-lv-logo-mark span:nth-child(5),.bc-lv-logo-mark span:nth-child(6),.bc-lv-logo-mark span:nth-child(8){background:#E9B72C}
.bc-lv-logo-txt{font-family:Oswald,sans-serif;font-weight:600;font-size:14.5px;letter-spacing:.1em;text-transform:uppercase;color:#F1F2F3;white-space:nowrap}
.bc-lv-nav{display:flex;align-items:center;gap:clamp(11px,1.7vw,24px);margin-right:auto;overflow-x:auto;scrollbar-width:none}
.bc-lv-nav::-webkit-scrollbar{display:none}
.bc-lv-nav a{font-family:'IBM Plex Mono',monospace;font-size:12px;font-weight:500;letter-spacing:.13em;text-transform:uppercase;color:#9BA1A8;white-space:nowrap;text-decoration:none;transition:color .16s}
.bc-lv-nav a:hover{color:#E9B72C}
.bc-lv-nav a.is-current{color:#E9B72C}
.bc-lv-lang{display:flex;border:1px solid rgba(255,255,255,.12);border-radius:5px;overflow:hidden;flex:0 0 auto}
.bc-lv-lang span,.bc-lv-lang a{padding:5px 10px;font-family:'IBM Plex Mono',monospace;font-size:11.5px;font-weight:600;letter-spacing:.1em;display:flex;align-items:center;text-decoration:none}
.bc-lv-lang span[aria-current]{background:#E9B72C;color:#101112}
.bc-lv-lang a{background:transparent;color:#9BA1A8}
.bc-lv-lang a:not(:first-child),.bc-lv-lang span:not(:first-child){border-left:1px solid rgba(255,255,255,.12)}
.bc-lv-lang a:hover{color:#E9B72C}

/* ---------- hero ---------- */
.bc-lv-hero{max-width:1240px;margin:0 auto;padding:clamp(20px,3vw,40px) clamp(16px,4vw,48px) clamp(10px,1.6vw,20px);
  display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,1fr);gap:clamp(20px,3.5vw,48px);align-items:center}
.bc-lv-h1{font-family:Oswald,sans-serif;font-weight:600;font-size:clamp(26px,3.4vw,44px);line-height:1.05;letter-spacing:.005em;text-transform:uppercase;color:#F4F5F6;margin:0 0 16px;text-wrap:balance}
.bc-lv-intro{margin:0 0 12px;color:#B4B9BF;font-size:clamp(15px,1.15vw,17px);line-height:1.62;max-width:60ch}
.bc-lv-sec{margin:0 0 22px;color:#9BA1A8;font-size:14.5px;line-height:1.6;max-width:58ch}
.bc-lv-hero-cta{display:flex;flex-wrap:wrap;gap:12px}
.bc-lv-hero-fig{margin:0;border:1px solid rgba(255,255,255,.1);border-radius:10px;overflow:hidden;background:#000;box-shadow:0 24px 64px rgba(0,0,0,.5)}
.bc-lv-hero-fig img{display:block;width:100%;height:auto}

/* ---------- controls strip ---------- */
.bc-lv-controls-strip{max-width:1240px;margin:6px auto 0;padding:12px clamp(16px,4vw,48px);display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:14px}
.bc-controls{display:flex;flex-wrap:wrap;gap:8px}
.bc-filter{font-family:'IBM Plex Mono',monospace;font-size:11.5px;font-weight:600;letter-spacing:.1em;text-transform:uppercase;color:#9BA1A8;background:rgba(255,255,255,.03);border:1px solid rgba(255,255,255,.12);border-radius:5px;padding:7px 13px;cursor:pointer;transition:color .16s,border-color .16s,background .16s}
.bc-filter:hover{color:#E9B72C;border-color:rgba(233,183,44,.45)}
.bc-filter.is-on{background:#E9B72C;color:#101112;border-color:#E9B72C}
.bc-progress{display:flex;align-items:center;gap:10px}
.bc-progress-label{font-family:'IBM Plex Mono',monospace;font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:#7E858C}
.bc-progress-label b{color:#E9B72C;font-weight:600}
.bc-progress-track{width:120px;height:4px;background:rgba(255,255,255,.09);border-radius:2px;overflow:hidden}
.bc-progress-fill{display:block;height:100%;width:0;background:#E9B72C;transition:width .3s ease}

/* ---------- stage grid ---------- */
.bc-grid{max-width:1240px;margin:0 auto;padding:clamp(10px,1.6vw,18px) clamp(16px,4vw,48px) clamp(20px,3vw,36px);
  display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:clamp(16px,2vw,26px)}
.bc-grid-cta{grid-column:1/-1;display:flex;justify-content:center;padding:clamp(6px,1vw,14px) 0}
/* an element with an author display value ignores the UA [hidden] rule — force it for JS filtering */
.bc-stage[hidden],.bc-grid-cta[hidden],.bc-viewer-hint[hidden]{display:none!important}
.bc-stage{scroll-margin-top:72px;border:1px solid rgba(255,255,255,.08);border-radius:10px;background:#101316;padding:clamp(14px,1.6vw,20px);display:flex;flex-direction:column;gap:12px;transition:border-color .18s,box-shadow .18s}
.bc-stage:target{border-color:rgba(233,183,44,.65);box-shadow:0 0 0 1px rgba(233,183,44,.35),0 14px 40px rgba(233,183,44,.08)}
.bc-stage.is-highlight{border-color:rgba(233,183,44,.65);box-shadow:0 0 0 1px rgba(233,183,44,.35)}
.bc-stage-head{display:flex;align-items:baseline;gap:11px}
.bc-stage-num{font-family:'IBM Plex Mono',monospace;font-size:13px;font-weight:600;letter-spacing:.06em;color:#E9B72C;flex:0 0 auto}
.bc-stage-title{margin:0;font-family:Oswald,sans-serif;font-weight:500;font-size:clamp(17px,1.5vw,20px);letter-spacing:.02em;text-transform:uppercase;color:#EFF0F1;line-height:1.1}
.bc-stage-title a.bc-anchor{color:inherit;text-decoration:none}
.bc-stage-title a.bc-anchor:hover{color:#E9B72C}

/* figures: big action + small clean-map inset */
.bc-stage-figs{position:relative;margin:0;border-radius:8px;overflow:hidden;border:1px solid rgba(255,255,255,.08);background:#000;line-height:0}
.bc-fig{display:block;padding:0;margin:0;border:0;background:none;cursor:pointer;-webkit-tap-highlight-color:transparent}
.bc-fig-action{width:100%}
.bc-fig-action img{display:block;width:100%;height:auto;transition:filter .18s,transform .3s}
.bc-fig-action:hover img{filter:brightness(1.06)}
.bc-fig-map{position:absolute;right:8px;bottom:8px;width:26%;max-width:118px;min-width:74px;border:1px solid rgba(255,255,255,.28);border-radius:5px;overflow:hidden;box-shadow:0 6px 18px rgba(0,0,0,.55);background:#000;transition:border-color .18s,transform .18s}
.bc-fig-map img{display:block;width:100%;height:auto}
.bc-fig-map::after{content:"";position:absolute;inset:0;box-shadow:inset 0 0 0 1px rgba(0,0,0,.4)}
.bc-fig-map:hover{border-color:#E9B72C;transform:scale(1.04)}
.bc-fig:focus-visible{outline:2px solid #E9B72C;outline-offset:2px}

.bc-stage-preview{margin:0;color:#9BA1A8;font-size:14.5px;line-height:1.62;text-wrap:pretty}
.bc-tactics{border-top:1px solid rgba(255,255,255,.06);padding-top:10px;margin-top:2px}
.bc-tactics summary{list-style:none;cursor:pointer;display:inline-flex;align-items:center;gap:8px;font-family:'IBM Plex Mono',monospace;font-size:11.5px;font-weight:600;letter-spacing:.13em;text-transform:uppercase;color:#E9B72C}
.bc-tactics summary::-webkit-details-marker{display:none}
.bc-tactics summary::after{content:"+";font-size:14px;color:#7E858C;transition:transform .2s,color .2s}
.bc-tactics[open] summary::after{content:"−";color:#E9B72C}
.bc-tactics summary:hover{color:#F3C441}
.bc-tactics-body{margin-top:10px}
.bc-tactics-body p{margin:0;color:#B4B9BF;font-size:14.5px;line-height:1.7;text-wrap:pretty}

/* ---------- final CTA + about ---------- */
.bc-lv-final{max-width:1240px;margin:0 auto;padding:clamp(6px,1vw,14px) clamp(16px,4vw,48px) clamp(24px,3vw,40px);display:flex;justify-content:center}
.bc-lv-about{max-width:900px;margin:0 auto;padding:clamp(20px,3vw,40px) clamp(16px,4vw,48px) clamp(44px,5vw,72px)}
.bc-lv-about-h{font-family:Oswald,sans-serif;font-weight:600;font-size:clamp(20px,2vw,26px);text-transform:uppercase;color:#EDEEEF;margin:0 0 14px}
.bc-lv-about p{margin:0 0 12px;color:#8F959C;font-size:14px;line-height:1.7;max-width:80ch}

/* ---------- footer ---------- */
.bc-lv-footer{border-top:1px solid rgba(255,255,255,.07);background:#0C0E10}
.bc-lv-footer-in{max-width:1240px;margin:0 auto;padding:24px clamp(16px,4vw,48px);display:flex;flex-wrap:wrap;align-items:center;gap:16px}
.bc-lv-footer-brand{font-family:Oswald,sans-serif;font-weight:600;font-size:14px;letter-spacing:.11em;text-transform:uppercase;color:#D8DADC}
.bc-lv-footer-nav{display:flex;flex-wrap:wrap;gap:16px;margin-right:auto}
.bc-lv-footer-nav a{font-family:'IBM Plex Mono',monospace;font-size:11.5px;letter-spacing:.12em;text-transform:uppercase;color:#8B9299;text-decoration:none;transition:color .16s}
.bc-lv-footer-nav a:hover{color:#E9B72C}
.bc-lv-footer-nav a.is-current{color:#E9B72C}
.bc-lv-footer-note{max-width:1240px;margin:0 auto;padding:0 clamp(16px,4vw,48px) 24px}
.bc-lv-footer-note p{margin:0;color:#61686F;font-size:12.5px;line-height:1.6}

/* ---------- viewer / lightbox ---------- */
.bc-viewer{position:fixed;inset:0;z-index:1000;display:flex;align-items:center;justify-content:center;background:rgba(6,7,9,.94);padding:clamp(8px,2vw,28px);opacity:0;transition:opacity .18s;-webkit-tap-highlight-color:transparent}
.bc-viewer[hidden]{display:none}
.bc-viewer.is-open{opacity:1}
body.bc-lb-open{overflow:hidden}
.bc-viewer-backdrop{position:absolute;inset:0}
.bc-viewer-panel{position:relative;z-index:1;display:flex;flex-direction:column;width:min(1080px,100%);max-height:94vh;background:#0E1013;border:1px solid rgba(255,255,255,.12);border-radius:10px;overflow:hidden;box-shadow:0 30px 90px rgba(0,0,0,.6)}
.bc-viewer-bar{display:flex;align-items:center;gap:12px;padding:9px 12px;background:linear-gradient(180deg,#1A1E22,#141719);border-bottom:1px solid rgba(255,255,255,.08);flex:0 0 auto}
.bc-viewer-stage{font-family:Oswald,sans-serif;font-weight:600;font-size:14px;letter-spacing:.1em;text-transform:uppercase;color:#F1F2F3;white-space:nowrap}
.bc-viewer-count{font-family:'IBM Plex Mono',monospace;font-size:12px;letter-spacing:.1em;color:#8B9299;margin-right:auto}
.bc-viewer-count b{color:#E9B72C;font-weight:600}
.bc-viewer-modes{display:flex;border:1px solid rgba(255,255,255,.14);border-radius:5px;overflow:hidden;flex:0 0 auto}
.bc-v-mode{background:transparent;color:#9BA1A8;border:0;font-family:'IBM Plex Mono',monospace;font-size:11px;font-weight:600;letter-spacing:.1em;text-transform:uppercase;padding:6px 12px;cursor:pointer;transition:color .16s,background .16s}
.bc-v-mode+.bc-v-mode{border-left:1px solid rgba(255,255,255,.14)}
.bc-v-mode:hover{color:#E9B72C}
.bc-v-mode.is-on{background:#E9B72C;color:#101112}
.bc-viewer-close{flex:0 0 auto;width:34px;height:34px;display:flex;align-items:center;justify-content:center;background:rgba(255,255,255,.03);border:1px solid rgba(255,255,255,.14);border-radius:5px;color:#C9CDD2;font-size:16px;line-height:1;cursor:pointer;transition:color .16s,border-color .16s}
.bc-viewer-close:hover{color:#E9B72C;border-color:rgba(233,183,44,.55)}
.bc-viewer-stagewrap{position:relative;display:flex;align-items:center;justify-content:center;background:#000;flex:0 0 auto;padding:10px clamp(48px,7vw,64px);touch-action:pan-y}
.bc-viewer-imgwrap{display:flex;align-items:center;justify-content:center;width:100%}
#bc-v-img{max-width:100%;max-height:60vh;width:auto;height:auto;object-fit:contain;display:block}
.bc-viewer-nav{position:absolute;top:50%;transform:translateY(-50%);width:42px;height:42px;display:flex;align-items:center;justify-content:center;background:rgba(20,23,26,.86);border:1px solid rgba(255,255,255,.14);border-radius:6px;color:#C9CDD2;font-size:24px;line-height:1;cursor:pointer;transition:color .16s,border-color .16s,opacity .16s}
.bc-viewer-nav:hover{color:#E9B72C;border-color:rgba(233,183,44,.55)}
.bc-viewer-prev{left:clamp(6px,1.4vw,12px)}
.bc-viewer-next{right:clamp(6px,1.4vw,12px)}
.bc-viewer-nav[disabled]{opacity:.25;cursor:default;pointer-events:none}
.bc-viewer-text{padding:14px clamp(14px,2.4vw,24px) 18px;overflow-y:auto;-webkit-overflow-scrolling:touch;flex:1 1 auto}
.bc-viewer-title{margin:0 0 10px;font-family:Oswald,sans-serif;font-weight:500;font-size:19px;letter-spacing:.02em;text-transform:uppercase;color:#EFF0F1}
.bc-viewer-tactics p{margin:0 0 16px;color:#B4B9BF;font-size:15px;line-height:1.72}
.bc-cta-viewer{margin-top:2px}
.bc-viewer-hint{position:absolute;left:50%;bottom:14px;transform:translateX(-50%);margin:0;padding:8px 16px;background:rgba(16,17,18,.92);border:1px solid rgba(233,183,44,.4);border-radius:20px;font-family:'IBM Plex Mono',monospace;font-size:11.5px;letter-spacing:.08em;color:#E9B72C;white-space:nowrap;pointer-events:none;z-index:2}

/* ---------- responsive ---------- */
@media (max-width:900px){
  .bc-lv-hero{grid-template-columns:1fr;gap:18px}
}
@media (max-width:720px){
  .bc-grid{grid-template-columns:1fr}
  .bc-lv-controls-strip{justify-content:flex-start}
}
@media (max-width:640px){
  .bc-viewer{padding:0}
  .bc-viewer-panel{width:100%;max-height:100vh;height:100dvh;border:0;border-radius:0}
  #bc-v-img{max-height:46vh}
  .bc-viewer-stagewrap{padding:8px 8px}
  .bc-viewer-nav{width:38px;height:38px;background:rgba(20,23,26,.7)}
  .bc-viewer-prev{left:6px}
  .bc-viewer-next{right:6px}
  .bc-viewer-text{padding:14px 16px 20px}
}
@media (prefers-reduced-motion:reduce){
  #bc-levels *,.bc-viewer *{transition:none!important}
  .bc-fig-action:hover img{transform:none}
}