/* V31 · mismo header visual del Mundial dentro del juego */
.v31-game-header{
  position:fixed;left:0;right:0;top:0;z-index:9500;height:78px;
  padding:calc(10px + env(safe-area-inset-top)) 18px 10px;
  display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:10px;
  background:linear-gradient(125deg,#03362a 0%,#075c45 50%,#0a7a56 100%);
  color:#fff;box-shadow:0 14px 34px rgba(3,42,31,.22);overflow:hidden;
}
.v31-game-header:after{content:"";position:absolute;inset:-80% auto -80% -20%;width:38%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.08),transparent);transform:skewX(-20deg);animation:v31GameHeaderSweep 7s ease-in-out infinite;pointer-events:none}
@keyframes v31GameHeaderSweep{0%,48%{transform:translateX(-30%) skewX(-20deg)}75%,100%{transform:translateX(380%) skewX(-20deg)}}
.v31-game-brand{display:flex;align-items:center;gap:10px;min-width:0;position:relative;z-index:1;text-decoration:none;color:#fff}.v31-game-brand img{width:46px;height:46px;object-fit:contain;background:#fff;border-radius:14px;padding:2px}.v31-game-brand span{min-width:0}.v31-game-brand small,.v31-game-brand b{display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.v31-game-brand small{font-size:8px;font-weight:850;letter-spacing:.055em;color:#cce4db;max-width:220px}.v31-game-brand b{font-size:14px;font-weight:1000;margin-top:2px}
.v31-game-desktop-nav{display:none;position:relative;z-index:1}.v31-game-desktop-nav a,.v31-game-desktop-nav span{color:#e9f6f1;text-decoration:none;border-radius:13px;padding:10px 12px;font-size:10px;font-weight:900;white-space:nowrap}.v31-game-desktop-nav span.active{background:#fff;color:#075b43;box-shadow:0 9px 24px rgba(0,0,0,.12)}
.v31-game-actions{display:flex;align-items:center;gap:7px;position:relative;z-index:1}.v31-game-teacher,.v31-game-home,.v31-game-sound{height:42px;border-radius:13px;border:1px solid rgba(255,255,255,.16);background:rgba(255,255,255,.10);color:#fff;display:flex;align-items:center;justify-content:center;text-decoration:none}.v31-game-teacher{width:42px}.v31-game-teacher b{display:none}.v31-game-home,.v31-game-sound{width:42px;font-size:17px}.v31-game-sound{font:inherit;cursor:pointer}
.db-game-shell{padding-top:78px!important}
body.playing .v31-game-header{display:none!important}body.playing .db-game-shell{padding-top:0!important}

/* Home del juego, coherente con el Mundial */
.db-game-main{padding-top:18px!important}.db-hero-v72{box-shadow:0 24px 58px rgba(5,52,38,.16)!important}.db-hero-v72:before{content:"";position:absolute;inset:0;z-index:3;pointer-events:none;background:radial-gradient(circle at 78% 18%,rgba(255,214,95,.18),transparent 20%)}
.db-game-chip{backdrop-filter:blur(9px)}
.db-primary-btn,.db-play-main{transition:.2s ease}.db-primary-btn:hover,.db-play-main:hover{transform:translateY(-2px)}

@media(min-width:920px){
  .v31-game-header{height:86px;padding:0 34px;grid-template-columns:auto 1fr auto;border-bottom:1px solid rgba(255,255,255,.08)}
  .v31-game-brand img{width:52px;height:52px;border-radius:15px}.v31-game-brand small{font-size:9px;max-width:270px}.v31-game-brand b{font-size:16px}
  .v31-game-desktop-nav{display:flex;align-items:center;justify-content:center;gap:3px}
  .v31-game-teacher{width:auto;padding:0 15px;gap:7px}.v31-game-teacher b{display:block;font-size:11px}
  .v31-game-home{display:none}.v31-game-sound{height:48px;width:48px;border-radius:15px}
  .db-game-shell{padding-top:86px!important}
}
@media(max-width:620px){
  .v31-game-header{height:76px;padding:calc(9px + env(safe-area-inset-top)) 12px 9px}.v31-game-brand img{width:43px;height:43px}.v31-game-brand small{font-size:7px;max-width:165px}.v31-game-brand b{font-size:12px;max-width:180px}.v31-game-actions{gap:5px}.v31-game-teacher,.v31-game-home,.v31-game-sound{width:39px;height:39px;border-radius:12px}.v31-game-teacher{display:none}.db-game-shell{padding-top:76px!important}.db-game-main{padding-top:10px!important}
}
@media(prefers-reduced-motion:reduce){.v31-game-header:after{animation:none!important}}