/* ===== TSA color scheme: Blue / Red / White ===== */
:root{
  --tsa-blue:#003da5;     /* TSA blue */
  --tsa-blue-dark:#002a73;
  --tsa-red:#cf2030;      /* TSA red */
  --tsa-red-dark:#a3121f;
  --white:#ffffff;
  --ink:#0c1b3a;
  --soft:#eef3fb;
  --gas:#cfe8ff;
}

*{box-sizing:border-box;margin:0;padding:0}
body{
  font-family:"Segoe UI",system-ui,Arial,sans-serif;
  color:var(--ink);
  background:
    radial-gradient(1200px 600px at 50% -10%, #e9f0ff 0%, transparent 60%),
    linear-gradient(160deg,#f6f9ff 0%,#eaf0fb 100%);
  min-height:100vh;
}

/* ===== Top bar ===== */
.topbar{
  display:flex;align-items:center;justify-content:space-between;
  gap:16px;padding:12px 22px;
  background:linear-gradient(90deg,var(--tsa-blue),var(--tsa-blue-dark));
  color:#fff;box-shadow:0 4px 18px rgba(0,40,120,.25);
  border-bottom:4px solid var(--tsa-red);
}
.brand{display:flex;align-items:center;gap:12px}
.logo{
  background:var(--white);color:var(--tsa-blue);
  font-weight:900;letter-spacing:1px;
  padding:6px 12px;border-radius:8px;
  border:3px solid var(--tsa-red);font-size:18px;
}
.logo.big{font-size:34px;padding:12px 22px;display:inline-block;margin-bottom:10px}
.logo-img{height:52px;width:auto;display:block;background:#fff;padding:4px 6px;border-radius:8px}
.logo-img.big{height:auto;width:230px;margin:0 auto 16px;padding:8px}
.brand-text{font-weight:600;opacity:.9;font-size:14px}
.title{font-size:20px;font-weight:800;letter-spacing:.5px;text-align:center}
.score-pill{
  background:var(--tsa-red);padding:8px 16px;border-radius:999px;
  font-weight:800;box-shadow:0 2px 8px rgba(0,0,0,.2)
}

/* ===== Overlays / cards ===== */
.overlay{
  position:fixed;inset:0;display:flex;align-items:center;justify-content:center;
  background:rgba(8,20,50,.55);backdrop-filter:blur(4px);z-index:50;padding:20px;
}
.overlay.hidden{display:none}
.hidden{display:none !important}
.card{
  background:#fff;max-width:560px;width:100%;padding:34px;border-radius:20px;
  text-align:center;box-shadow:0 20px 60px rgba(0,30,90,.35);
  border-top:8px solid var(--tsa-red);
}
.card h2{color:var(--tsa-blue);font-size:28px;margin-bottom:12px}
.lead{font-size:16px;line-height:1.5;margin-bottom:16px}
.sub{color:#56607a;margin-bottom:18px}
.how{text-align:left;max-width:420px;margin:0 auto 22px;line-height:1.9;font-size:15px}
.trophy{font-size:64px;margin-bottom:6px}

/* ===== Buttons ===== */
.btn{
  border:none;cursor:pointer;font-weight:800;font-size:15px;
  padding:13px 26px;border-radius:12px;transition:transform .08s, box-shadow .2s, opacity .2s;
}
.btn:active{transform:translateY(2px)}
.btn-primary{background:var(--tsa-blue);color:#fff;box-shadow:0 6px 16px rgba(0,61,165,.4)}
.btn-primary:hover{background:var(--tsa-blue-dark)}
.btn-red{background:var(--tsa-red);color:#fff;box-shadow:0 6px 16px rgba(207,32,48,.4)}
.btn-red:hover{background:var(--tsa-red-dark)}
.btn-red:disabled{background:#c4ccda;color:#fff;cursor:not-allowed;box-shadow:none}
.btn-ghost{background:transparent;color:var(--tsa-blue);border:2px solid var(--tsa-blue)}
.btn-ghost:hover{background:var(--soft)}

/* ===== Lab layout ===== */
.lab{max-width:1000px;margin:0 auto;padding:18px}
.hint{
  text-align:center;background:#fff;border:2px solid var(--tsa-blue);
  color:var(--tsa-blue);font-weight:700;padding:12px;border-radius:12px;
  margin-bottom:18px;box-shadow:0 4px 12px rgba(0,40,120,.1);
}
.stage{
  display:grid;grid-template-columns:1fr 1.2fr 1fr;gap:18px;align-items:start;
}
@media(max-width:820px){.stage{grid-template-columns:1fr}}

/* ===== Bead tray ===== */
.tray,.panel{
  background:#fff;border-radius:16px;padding:16px;
  box-shadow:0 8px 24px rgba(0,30,90,.12);border-top:5px solid var(--tsa-blue);
}
.tray-label,.panel-title{
  font-weight:800;color:var(--tsa-blue);margin-bottom:12px;text-align:center;
  text-transform:uppercase;letter-spacing:.5px;font-size:14px;
}
.bead-supply{
  display:flex;flex-wrap:wrap;gap:10px;justify-content:center;
  min-height:120px;align-content:flex-start;
}
.tray-count{text-align:center;margin-top:10px;color:#56607a;font-size:13px}

.bead{
  width:34px;height:34px;border-radius:50%;
  background:radial-gradient(circle at 32% 30%,#a8f0c0,#1f9d55);
  border:2px solid #15803d;cursor:grab;touch-action:none;
  box-shadow:inset -3px -4px 6px rgba(0,0,0,.25),0 3px 6px rgba(0,0,0,.2);
  transition:transform .1s;
}
.bead:hover{transform:scale(1.12)}
.bead.dragging{opacity:.4}
.bead.flying{
  position:fixed;z-index:60;pointer-events:none;margin:0;
  transition:left .35s cubic-bezier(.5,0,.6,1), top .35s cubic-bezier(.5,0,.6,1), transform .35s, opacity .35s;
}

/* ===== Digester ===== */
.digester-wrap{display:flex;flex-direction:column;align-items:center;position:relative}

.gas-dome{
  position:relative;width:170px;height:90px;
  background:linear-gradient(180deg,#dbeeff,#b9d9f5);
  border:3px solid var(--tsa-blue);border-bottom:none;
  border-radius:120px 120px 0 0;overflow:hidden;
  display:flex;align-items:flex-end;justify-content:center;
}
.gas-fill{
  position:absolute;left:0;bottom:0;width:100%;height:0%;
  background:linear-gradient(180deg,#7fc4ff,#cde6ff);
  transition:height .4s ease;opacity:.85;
}
.gas-label{position:absolute;top:14px;font-weight:900;color:var(--tsa-blue);opacity:.5;letter-spacing:2px;font-size:13px}
.gas-gauge{
  position:absolute;top:26px;left:50%;transform:translateX(-50%);
  width:46px;height:24px;border:2px solid var(--tsa-blue);border-bottom:none;
  border-radius:46px 46px 0 0;background:#fff;overflow:hidden;
}
.needle{
  position:absolute;left:50%;bottom:0;width:2px;height:20px;background:var(--tsa-red);
  transform-origin:bottom center;transform:rotate(-80deg);transition:transform .4s ease;
}

.lid{
  width:200px;height:30px;margin-top:-2px;
  background:linear-gradient(180deg,var(--tsa-red),var(--tsa-red-dark));
  border-radius:8px;cursor:pointer;position:relative;z-index:5;
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 4px 10px rgba(0,0,0,.25);
  transition:transform .5s ease;
  border:2px solid var(--tsa-red-dark);
}
.lid-text{color:#fff;font-weight:800;font-size:12px;letter-spacing:1px}
.lid-handle{position:absolute;top:-10px;width:50px;height:10px;background:var(--tsa-red-dark);border-radius:6px 6px 0 0}
.lid.open{transform:translateX(120px) translateY(-40px) rotate(28deg)}

.tank{
  width:200px;height:230px;position:relative;
  background:linear-gradient(90deg,#3a6fc4,#5d8fe0 40%,#3a6fc4);
  border:3px solid var(--tsa-blue-dark);border-radius:10px;overflow:hidden;
  box-shadow:0 10px 26px rgba(0,30,90,.25);
}
.tank.open{box-shadow:0 0 0 4px rgba(207,32,48,.4),0 10px 26px rgba(0,30,90,.25)}
.tank-window{
  position:absolute;top:18px;left:24px;right:24px;bottom:60px;
  background:linear-gradient(180deg, rgba(255,255,255,.18), rgba(255,255,255,.04));
  border:2px solid rgba(255,255,255,.35);border-radius:8px;
}
.tank-label{
  position:absolute;bottom:14px;width:100%;text-align:center;
  color:#fff;font-weight:900;font-size:13px;letter-spacing:1px;opacity:.85;line-height:1.2;
}
.slurry{
  position:absolute;left:0;bottom:0;width:100%;height:18%;
  background:linear-gradient(180deg,#7a5a2e,#5b4220);
  transition:height .5s ease;border-top:3px solid #8a6a3a;
}

/* bubbles */
.bubbles{position:absolute;inset:0;pointer-events:none}
.bubble{
  position:absolute;bottom:18%;border-radius:50%;
  background:radial-gradient(circle at 35% 30%, #ffffff, #bfe2ff);
  opacity:.85;animation:rise linear forwards;
}
@keyframes rise{
  0%{transform:translateY(0) scale(.6);opacity:.9}
  100%{transform:translateY(-180px) scale(1.1);opacity:0}
}

.outlet{width:40px;height:14px;background:var(--tsa-blue-dark);border-radius:0 0 6px 6px}
.base{width:240px;height:16px;background:#2a3550;border-radius:8px;margin-top:2px;box-shadow:0 6px 14px rgba(0,0,0,.2)}

/* ===== Panel readings ===== */
.reading{
  display:flex;justify-content:space-between;align-items:center;
  background:var(--soft);padding:10px 12px;border-radius:10px;margin-bottom:10px;font-size:14px;
}
.reading b{color:var(--tsa-blue)}
.panel .btn{width:100%;margin-top:6px}

/* drop highlight */
.tank.droppable{outline:4px dashed var(--tsa-red);outline-offset:4px}

/* ===== Slurry select ===== */
.card-wide{max-width:860px}
.slurry-grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:18px;
}
@media(max-width:720px){.slurry-grid{grid-template-columns:1fr}}
.slurry-card{
  background:var(--soft);border:3px solid #d3deef;border-radius:16px;
  padding:18px 14px;cursor:pointer;text-align:center;transition:transform .12s, border-color .12s, box-shadow .2s;
  font-family:inherit;
}
.slurry-card:hover{transform:translateY(-4px);border-color:var(--tsa-blue);box-shadow:0 10px 24px rgba(0,40,120,.2)}
.slurry-card h3{color:var(--tsa-blue);font-size:17px;margin:8px 0}
.slurry-emoji{font-size:46px}
.slurry-card p{font-size:13px;color:#46506a;line-height:1.45;margin-top:8px}
.meter{height:12px;background:#fff;border:2px solid var(--tsa-blue);border-radius:8px;overflow:hidden;margin:6px 0}
.bar{display:block;height:100%}
.bar-3{width:100%;background:var(--tsa-red)}
.bar-2{width:66%;background:var(--tsa-red)}
.bar-1{width:33%;background:var(--tsa-red)}
.rating{font-weight:800;font-size:14px;margin-bottom:4px}
.rate-high{color:var(--tsa-red)}
.rate-mid{color:#e07b00}
.rate-low{color:#2e7d32}
.used-note{
  margin-top:8px !important;font-weight:800 !important;color:var(--tsa-blue) !important;
}

/* ===== Balloon experiment ===== */
.bottle-wrap{display:flex;flex-direction:column;align-items:center;position:relative}

.balloon{
  width:70px;height:84px;
  background:radial-gradient(circle at 34% 28%, #ff8a93, var(--tsa-red) 60%, var(--tsa-red-dark));
  border-radius:50% 50% 48% 48%;
  position:relative;margin-bottom:-6px;z-index:6;
  transform-origin:bottom center;transform:scale(.45);
  transition:transform .45s cubic-bezier(.34,1.4,.7,1);
  box-shadow:inset -6px -8px 14px rgba(0,0,0,.2);
}
.balloon::after{ /* highlight */
  content:"";position:absolute;top:14px;left:16px;width:16px;height:22px;
  background:rgba(255,255,255,.5);border-radius:50%;filter:blur(1px);
}
.balloon-knot{
  position:absolute;bottom:-7px;left:50%;transform:translateX(-50%);
  width:0;height:0;border-left:7px solid transparent;border-right:7px solid transparent;
  border-top:10px solid var(--tsa-red-dark);
}
.balloon.danger{animation:wobble .35s ease-in-out infinite}
@keyframes wobble{0%,100%{rotate:-2deg}50%{rotate:2deg}}
.balloon.popped{transform:scale(2);opacity:0;transition:transform .18s ease-out, opacity .18s ease-out}

.boom{
  position:absolute;top:6px;left:50%;transform:translateX(-50%);
  font-size:90px;z-index:7;animation:boom .6s ease-out forwards;
}
.boom.hidden{display:none}
@keyframes boom{0%{transform:translateX(-50%) scale(.2);opacity:0}30%{opacity:1}100%{transform:translateX(-50%) scale(1.5);opacity:0}}

.bottle{display:flex;flex-direction:column;align-items:center;filter:drop-shadow(0 12px 18px rgba(0,30,90,.18))}

/* threaded screw-top mouth (balloon stretches over this) */
.bottle-neck{
  width:34px;height:24px;z-index:4;
  background:
    repeating-linear-gradient(180deg, rgba(150,185,225,.55) 0 3px, rgba(225,240,255,.65) 3px 6px);
  border:2px solid rgba(140,175,215,.7);border-bottom:none;border-radius:4px 4px 0 0;
}
/* tapered shoulder from neck to body */
.bottle-shoulder{
  width:118px;height:34px;margin-top:-2px;
  clip-path:polygon(28% 0,72% 0,100% 100%,0 100%);
  background:linear-gradient(100deg, rgba(255,255,255,.30), rgba(200,228,255,.20) 45%, rgba(255,255,255,.34) 60%, rgba(200,228,255,.18));
  border-left:2px solid rgba(150,190,230,.4);border-right:2px solid rgba(150,190,230,.4);
}
/* cylindrical see-through body */
.bottle-body{
  width:130px;height:236px;position:relative;overflow:hidden;margin-top:-2px;
  background:linear-gradient(100deg,
    rgba(255,255,255,.30) 0%, rgba(196,226,255,.16) 28%,
    rgba(255,255,255,.34) 50%, rgba(196,226,255,.16) 72%, rgba(255,255,255,.24) 100%);
  border:2px solid rgba(150,190,230,.55);
  border-radius:10px 10px 26px 26px / 8px 8px 40px 40px;
  box-shadow:inset 6px 0 10px rgba(255,255,255,.35), inset -10px 0 14px rgba(120,160,210,.18);
  backdrop-filter:blur(.5px);
}
/* structural rib rings near the top */
.bottle-body::before{
  content:"";position:absolute;top:8px;left:0;right:0;height:34px;z-index:4;pointer-events:none;
  background:repeating-linear-gradient(180deg, transparent 0 7px, rgba(120,160,205,.16) 7px 9px);
}
/* grip indents in the middle */
.bottle-grip{
  position:absolute;top:46%;left:0;right:0;height:46px;z-index:4;pointer-events:none;
  background:repeating-linear-gradient(180deg, transparent 0 12px, rgba(120,160,205,.20) 12px 16px);
  box-shadow:inset 0 8px 8px -8px rgba(80,120,170,.35), inset 0 -8px 8px -8px rgba(80,120,170,.35);
}
.bottle-shine{position:absolute;top:8px;left:16px;width:12px;height:84%;background:linear-gradient(180deg,rgba(255,255,255,.65),rgba(255,255,255,.15));border-radius:8px;z-index:5;pointer-events:none}
.bottle-body .slurry{height:26%;z-index:1}
.bottle-body .bubbles{z-index:2}
.bottle-body.droppable{outline:4px dashed var(--tsa-red);outline-offset:4px}

/* credit */
.credit{
  position:fixed;left:14px;bottom:12px;z-index:40;
  font-family:"Brush Script MT","Segoe Script",cursive;
  font-size:18px;font-style:italic;color:var(--tsa-blue);
  opacity:.8;text-shadow:0 1px 2px rgba(255,255,255,.8);pointer-events:none;
}