/* ============================================================
   AWS Cloud Foundations Quiz — sistema visual
   Paleta: AWS Squid Ink (#232F3E) + AWS Orange (#FF9900)
   ============================================================ */
:root{
  /* superficies */
  --ink-900:#0B1622;
  --ink-800:#131E2B;
  --ink-700:#1B2735;
  --ink-600:#232F3E;   /* AWS Squid Ink */
  --ink-500:#2E3D4F;
  --linea:rgba(255,255,255,.10);
  --linea-fuerte:rgba(255,255,255,.18);

  /* texto */
  --txt:#F4F7FA;
  --txt-2:#B9C6D4;      /* secundario legible (contraste 7:1 sobre ink-800) */
  --txt-3:#8C9AAB;
  --txt-oscuro:#111C28;

  /* marca */
  --naranja:#FF9900;
  --naranja-alto:#FFB43F;
  --naranja-bajo:#E07C00;
  --cian:#3BB7D9;

  /* respuestas */
  --a0:#D9414F; --a0-b:#B22D3A;
  --a1:#1F6FEB; --a1-b:#1657C0;
  --a2:#FF9900; --a2-b:#D97E00;
  --a3:#16A34A; --a3-b:#0F7C38;

  --ok:#2BC275;
  --mal:#E4576A;

  --r-sm:10px; --r-md:14px; --r-lg:20px; --r-xl:26px;
  --sombra-1:0 2px 10px rgba(0,0,0,.28);
  --sombra-2:0 14px 44px rgba(0,0,0,.42);
  --fuente:'Inter','Segoe UI Variable','Segoe UI',system-ui,-apple-system,'Helvetica Neue',Arial,sans-serif;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
html,body{margin:0;padding:0;min-height:100%}
body{
  font-family:var(--fuente);
  font-size:16px;
  color:var(--txt);
  background:var(--ink-900);
  background-image:
    radial-gradient(900px 520px at 82% -8%, rgba(255,153,0,.20), transparent 62%),
    radial-gradient(760px 480px at 8% 4%, rgba(59,183,217,.14), transparent 60%),
    linear-gradient(178deg,#16222F 0%, #101B27 46%, #0A131D 100%);
  background-attachment:fixed;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
  touch-action:manipulation;
}

.wrap{
  max-width:1120px;margin:0 auto;min-height:100dvh;display:flex;flex-direction:column;
  padding:18px 18px calc(18px + env(safe-area-inset-bottom));
}
.centro{align-items:center;justify-content:center;text-align:center}

h1,h2,h3{margin:0 0 .45em;line-height:1.14;letter-spacing:-.015em;font-weight:800}
h1{font-size:clamp(28px,5vw,40px)}
p{margin:0 0 .8em;line-height:1.55}

/* ---------------------------------------------------- marca */
.marca{
  display:inline-flex;align-items:center;gap:9px;
  font-size:13px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--txt-2);
}
.marca b{color:var(--naranja);font-weight:800}
.marca svg{width:24px;height:24px;flex:0 0 24px;color:var(--naranja)}
.centro .marca{justify-content:center}

/* ---------------------------------------------------- superficies */
.tarjeta{
  background:linear-gradient(180deg, rgba(255,255,255,.055), rgba(255,255,255,.022));
  border:1px solid var(--linea);
  border-radius:var(--r-xl);
  padding:26px;
  box-shadow:var(--sombra-2);
  backdrop-filter:blur(10px);
}
.panel{
  background:rgba(255,255,255,.045);border:1px solid var(--linea);
  border-radius:var(--r-lg);padding:18px;
}
.pill{
  display:inline-flex;align-items:center;gap:7px;
  background:rgba(255,255,255,.09);border:1px solid var(--linea);
  border-radius:999px;padding:7px 15px;font-size:14px;font-weight:700;color:var(--txt);
  white-space:nowrap;
}
.pill.naranja{background:rgba(255,153,0,.16);border-color:rgba(255,153,0,.4);color:var(--naranja-alto)}

/* ---------------------------------------------------- botones */
button{font-family:inherit}
.btn{
  -webkit-appearance:none;border:0;cursor:pointer;
  border-radius:var(--r-md);
  padding:16px 26px;min-height:56px;
  font-size:17px;font-weight:800;letter-spacing:-.01em;
  background:linear-gradient(180deg,var(--naranja-alto),var(--naranja));
  color:var(--txt-oscuro);
  box-shadow:0 4px 0 var(--naranja-bajo), var(--sombra-1);
  transition:transform .08s ease, filter .18s ease, box-shadow .08s ease;
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
}
.btn:hover{filter:brightness(1.07)}
.btn:active{transform:translateY(3px);box-shadow:0 1px 0 var(--naranja-bajo)}
.btn:focus-visible{outline:3px solid var(--cian);outline-offset:3px}
.btn:disabled{opacity:.4;cursor:not-allowed;transform:none;filter:none}
.btn.sec{
  background:rgba(255,255,255,.10);color:var(--txt);
  border:1px solid var(--linea-fuerte);box-shadow:var(--sombra-1);
}
.btn.sec:active{transform:translateY(2px);box-shadow:none}
.btn.grande{width:100%;padding:19px;font-size:19px;min-height:62px}

/* ---------------------------------------------------- formularios */
input,select{
  -webkit-appearance:none;font-family:inherit;
  font-size:17px;font-weight:600;
  padding:16px 16px;min-height:58px;width:100%;
  border-radius:var(--r-md);
  border:2px solid var(--linea-fuerte);
  background:rgba(255,255,255,.06);
  color:var(--txt);
  outline:none;transition:border-color .18s, background .18s;
}
select{
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%23B9C6D4'%3E%3Cpath d='M7 10l5 5 5-5z'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 12px center;background-size:22px;padding-right:44px;
}
input::placeholder{color:rgba(185,198,212,.55);font-weight:600}
input:focus,select:focus{border-color:var(--naranja);background:rgba(255,255,255,.09)}
option{background:var(--ink-600);color:var(--txt)}
label{
  display:block;font-size:12.5px;font-weight:800;text-transform:uppercase;letter-spacing:.1em;
  color:var(--txt-2);margin:20px 0 8px;
}
label:first-of-type{margin-top:0}
.check{
  display:flex;align-items:center;gap:12px;cursor:pointer;
  text-transform:none;letter-spacing:0;font-size:15.5px;font-weight:600;color:var(--txt);
  margin:0 0 12px;padding:12px 14px;border-radius:var(--r-sm);
  background:rgba(255,255,255,.04);border:1px solid var(--linea);
}
.check input{width:22px;height:22px;min-height:0;flex:0 0 22px;accent-color:var(--naranja);margin:0;padding:0}

/* ---------------------------------------------------- respuestas */
.rejilla{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.op{
  position:relative;border:0;cursor:pointer;
  border-radius:var(--r-lg);
  padding:18px 20px;min-height:104px;
  display:flex;align-items:center;gap:14px;text-align:left;
  font-size:18px;font-weight:700;line-height:1.3;letter-spacing:-.01em;
  color:#fff;
  transition:transform .09s ease, box-shadow .09s ease, opacity .3s ease, filter .3s ease;
}
.op:focus-visible{outline:3px solid #fff;outline-offset:3px}
.op:active{transform:translateY(3px)}
.op .fig{flex:0 0 28px;width:28px;height:28px;display:block;opacity:.95}
.op .txt{flex:1;min-width:0}
.op0{background:linear-gradient(180deg,var(--a0),var(--a0-b));box-shadow:0 4px 0 rgba(0,0,0,.28)}
.op1{background:linear-gradient(180deg,var(--a1),var(--a1-b));box-shadow:0 4px 0 rgba(0,0,0,.28)}
.op2{background:linear-gradient(180deg,var(--a2),var(--a2-b));box-shadow:0 4px 0 rgba(0,0,0,.28);color:var(--txt-oscuro)}
.op3{background:linear-gradient(180deg,var(--a3),var(--a3-b));box-shadow:0 4px 0 rgba(0,0,0,.28)}
.op:active{box-shadow:0 1px 0 rgba(0,0,0,.28)}
.op.apagada{opacity:.42;filter:saturate(.55)}
.op.elegida{box-shadow:0 0 0 4px #fff, 0 4px 0 rgba(0,0,0,.28)}
.op.correcta{box-shadow:0 0 0 4px #fff, 0 0 30px rgba(43,194,117,.5), 0 4px 0 rgba(0,0,0,.28)}
.op .marca-ok{flex:0 0 auto;font-size:24px;font-weight:900}
.op .conteo{
  display:flex;align-items:center;gap:10px;margin-top:12px;
}
.op .pista{flex:1;height:9px;border-radius:999px;background:rgba(0,0,0,.26);overflow:hidden}
.op .pista > i{display:block;height:100%;border-radius:999px;background:rgba(255,255,255,.92);transition:width .7s cubic-bezier(.2,.8,.3,1)}
.op .num{font-size:16px;font-weight:900;flex:0 0 auto;min-width:22px;text-align:right}

/* ---------------------------------------------------- tiempo */
.tiempo{height:12px;border-radius:999px;background:rgba(255,255,255,.12);overflow:hidden;border:1px solid var(--linea)}
.tiempo > i{
  display:block;height:100%;border-radius:999px;
  background:linear-gradient(90deg,#2BC275 0%,#FF9900 62%,#E4576A 100%);
  transition:width .18s linear;
}
.reloj{
  font-size:clamp(38px,9vw,58px);font-weight:900;line-height:1;letter-spacing:-.03em;
  font-variant-numeric:tabular-nums;min-width:1.7em;text-align:center;
}
.reloj.urge{color:var(--mal);animation:latir .55s ease-in-out infinite}

/* ---------------------------------------------------- tablas */
table{width:100%;border-collapse:separate;border-spacing:0 7px}
thead th{
  font-size:11.5px;text-transform:uppercase;letter-spacing:.1em;color:var(--txt-2);
  font-weight:800;padding:0 14px 2px;text-align:left;
}
tbody td{padding:13px 14px;background:rgba(255,255,255,.055);font-size:16px;font-weight:600}
tbody td:first-child{
  border-radius:var(--r-sm) 0 0 var(--r-sm);font-weight:900;width:46px;color:var(--txt-2);
  font-variant-numeric:tabular-nums;
}
tbody td:last-child{border-radius:0 var(--r-sm) var(--r-sm) 0;text-align:right;font-weight:900;font-variant-numeric:tabular-nums}
tbody tr.yo td{background:rgba(255,153,0,.16);color:var(--naranja-alto)}

/* ---------------------------------------------------- varios */
.oculto{display:none !important}
.flex{display:flex;align-items:center;gap:12px}
.entre{justify-content:space-between}
.crece{flex:1;min-width:0}
.mini{font-size:13.5px;color:var(--txt-2);line-height:1.5}
.aviso{
  background:rgba(228,87,106,.14);border:1px solid rgba(228,87,106,.55);
  border-radius:var(--r-md);padding:14px 16px;font-weight:700;font-size:15px;color:#FFC9D1;
}
.expl{
  background:rgba(255,255,255,.06);border:1px solid var(--linea);
  border-left:4px solid var(--naranja);
  border-radius:var(--r-sm) var(--r-lg) var(--r-lg) var(--r-sm);
  padding:17px 19px;font-size:16.5px;line-height:1.6;color:var(--txt);
}
.expl b{color:var(--naranja-alto)}
a{color:var(--naranja-alto);text-decoration:none;font-weight:700}
a:hover{text-decoration:underline}
kbd{
  background:rgba(255,255,255,.11);border:1px solid var(--linea-fuerte);border-radius:6px;
  padding:3px 8px;font-size:12px;font-family:inherit;font-weight:800;color:var(--txt-2);
}

@keyframes entra{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:none}}
@keyframes latir{0%,100%{transform:scale(1)}50%{transform:scale(1.13)}}
@keyframes brilla{from{opacity:0;transform:scale(.86)}to{opacity:1;transform:scale(1)}}
.anim{animation:entra .3s cubic-bezier(.2,.8,.3,1) both}
.pop{animation:brilla .45s cubic-bezier(.2,1.3,.4,1) both}

@media (prefers-reduced-motion:reduce){
  *{animation-duration:.01ms !important;transition-duration:.01ms !important}
}

/* ---------------------------------------------------- móvil */
@media (max-width:720px){
  .wrap{padding:14px 14px calc(14px + env(safe-area-inset-bottom))}
  .rejilla{grid-template-columns:1fr;gap:11px}
  .op{min-height:76px;font-size:17.5px;padding:16px 17px;border-radius:var(--r-md)}
  .tarjeta{padding:20px;border-radius:var(--r-lg)}
  h1{font-size:28px}
}
@media (max-width:430px){
  .marca{font-size:11.5px;letter-spacing:.06em;gap:7px}
  .marca svg{width:20px;height:20px;flex:0 0 20px}
  .pill{font-size:12.5px;padding:6px 12px}
}
@media (max-width:380px){
  .op{font-size:16.5px;min-height:70px;padding:14px}
  .btn.grande{font-size:18px}
}