:root{--top:#59cfe6;--bot:#1d7fb8;--ink:#eaf6ff;--mut:#9fc3dc;--card:rgba(6,22,46,.72);--line:rgba(160,210,255,.22);
--t0:#9fe8ff;--t1:#3fd0d4;--t2:#3ddc97;--t3:#6f8fff;--t4:#b872ff;--t5:#ffcf5c}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;height:100%;overflow:hidden;color:var(--ink);font:16px/1.4 system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}
body{background:linear-gradient(180deg,var(--top),var(--bot));transition:none}
#fx{position:fixed;inset:0;width:100%;height:100%;pointer-events:none;z-index:0}
#rays{position:fixed;inset:0;pointer-events:none;z-index:0;opacity:var(--rays,.5);
background:repeating-linear-gradient(105deg,rgba(255,255,255,0) 0 90px,rgba(255,255,255,.07) 110px,rgba(255,255,255,0) 150px);
-webkit-mask-image:linear-gradient(180deg,#000,transparent 75%);mask-image:linear-gradient(180deg,#000,transparent 75%);animation:sway 9s ease-in-out infinite alternate}
@keyframes sway{from{transform:translateX(-30px)}to{transform:translateX(30px)}}
#app{position:relative;z-index:1;height:100%}
.screen{position:absolute;inset:0;display:none;flex-direction:column;align-items:center;padding:max(14px,env(safe-area-inset-top)) 16px max(14px,env(safe-area-inset-bottom))}
.screen.show{display:flex;animation:fadein .5s ease both}
@keyframes fadein{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
button{font:inherit;color:inherit;cursor:pointer}
.btn{background:rgba(7,40,82,.4);color:#fff;border:1px solid var(--line);border-radius:16px;padding:14px 18px;font-weight:700;letter-spacing:.01em;backdrop-filter:blur(6px);transition:transform .12s,background .2s}
.btn small{display:block;font-weight:500;font-size:12px;color:#cfe6f7;margin-top:2px}
.btn:hover{background:rgba(7,40,82,.55)}.btn:active{transform:scale(.97)}
.btn.primary{background:linear-gradient(180deg,#ffd45e,#f2a82e);color:#2b1a00;border-color:#ffe9a8}
.btn.primary small{color:#5a3a05}
.btn.ghost{background:rgba(0,0,0,.18)}
.btn:disabled{opacity:.5;cursor:default}
/* home */
#home{justify-content:center;text-align:center;gap:10px}
.logo{display:flex;flex-direction:column;line-height:.92;font-weight:900;letter-spacing:.06em;text-shadow:0 6px 30px rgba(0,30,70,.55)}
.logo span:first-child{font-size:clamp(54px,14vw,96px);color:#fff}
.logo span:last-child{font-size:clamp(34px,9.5vw,64px);color:#ffd45e}
.tag{max-width:30ch;color:#dff3ff;margin:6px 0 14px;text-shadow:0 2px 12px rgba(0,30,70,.6)}
.menu{display:flex;flex-direction:column;gap:12px;width:min(380px,100%)}
.row2{display:flex;gap:12px}.row2 .btn{flex:1}
.foot{color:var(--mut);font-size:13px;margin:12px 0 0;text-shadow:0 1px 8px rgba(0,20,50,.6)}
/* game */
#game{justify-content:flex-start;gap:10px;max-width:640px;margin:0 auto;width:100%}
.hud{display:flex;align-items:center;gap:10px;width:100%}
.icon{width:42px;height:42px;border-radius:14px;border:1px solid var(--line);background:rgba(0,0,0,.22);font-size:18px}
.icon.off{opacity:.45;text-decoration:line-through}
.hudmid{flex:1;display:flex;flex-direction:column;font-size:12px;color:var(--mut)}
.hudmid span:first-child{font-size:16px;color:var(--ink);font-weight:800}
.depthbox{display:flex;align-items:baseline;gap:3px;background:rgba(0,0,0,.28);border:1px solid var(--line);border-radius:14px;padding:6px 12px}
.depthbox b{font-size:22px;font-variant-numeric:tabular-nums;min-width:3.2ch;text-align:right}.depthbox span{font-size:12px;color:var(--mut)}
.stagebox{position:relative;width:100%;height:clamp(120px,24vh,220px);flex:none}
.gauge{position:absolute;right:2px;top:0;bottom:0;width:46px}
.gline{position:absolute;right:20px;top:4px;bottom:4px;width:3px;border-radius:2px;background:linear-gradient(180deg,rgba(255,255,255,.7),rgba(255,255,255,.15))}
#gticks{position:absolute;inset:0}
#gticks i{position:absolute;right:14px;width:16px;height:1px;background:rgba(255,255,255,.55);font-style:normal}
#gticks i b{position:absolute;right:20px;top:-7px;font-size:10px;color:var(--mut);font-weight:600;white-space:nowrap}
#gdot{position:absolute;right:15px;top:4px;width:13px;height:13px;border-radius:50%;background:#ffd45e;box-shadow:0 0 14px 4px rgba(255,212,94,.7);transition:none}
.sub{position:absolute;left:10%;top:50%;margin-top:-37px;animation:bob 3.2s ease-in-out infinite}
.sub svg{display:block;filter:drop-shadow(0 8px 14px rgba(0,0,0,.35))}
.beam{position:absolute;left:128px;top:14px;width:150px;height:48px;opacity:var(--beam,0);clip-path:polygon(0 38%,100% 0,100% 100%,0 62%);background:linear-gradient(90deg,rgba(255,246,200,.75),rgba(255,246,200,0));pointer-events:none}
@keyframes bob{0%,100%{transform:translateY(-6px) rotate(-1.5deg)}50%{transform:translateY(7px) rotate(1.5deg)}}
.sub.dive{animation:dive 1.7s cubic-bezier(.5,0,.2,1)}
@keyframes dive{0%{transform:translateY(0) rotate(0)}30%{transform:translateY(8px) rotate(9deg)}70%{transform:translateY(8px) rotate(9deg)}100%{transform:translateY(0) rotate(0)}}
.critter{position:absolute;top:30%;left:-120px;width:110px;opacity:0;pointer-events:none}
.critter.swim{animation:swim 3.4s linear both}
@keyframes swim{0%{transform:translateX(0);opacity:0}8%{opacity:1}90%{opacity:1}100%{transform:translateX(calc(100vw + 40px));opacity:0}}
.splash{position:absolute;left:0;right:56px;top:50%;transform:translateY(-50%);text-align:center;pointer-events:none;opacity:0}
.splash .tn{font-size:clamp(30px,9vw,54px);font-weight:900;letter-spacing:.05em;text-transform:uppercase;text-shadow:0 0 24px currentColor,0 4px 18px rgba(0,0,0,.5)}
.splash .pt{font-size:20px;font-weight:800;margin-top:2px;color:#fff;text-shadow:0 2px 10px rgba(0,0,0,.6)}
.splash.go{animation:splash 2.4s cubic-bezier(.2,.9,.2,1) both}
@keyframes splash{0%{opacity:0;transform:translateY(-50%) scale(.6)}14%{opacity:1;transform:translateY(-50%) scale(1.08)}22%{transform:translateY(-50%) scale(1)}80%{opacity:1}100%{opacity:0;transform:translateY(-70%) scale(1)}}
.card{width:100%;background:var(--card);border:1px solid var(--line);border-radius:22px;padding:18px 16px 16px;backdrop-filter:blur(10px);box-shadow:0 18px 50px rgba(0,10,30,.35);display:flex;flex-direction:column;gap:12px;overflow:auto;min-height:0;flex:1 1 auto}
.cat{font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--mut)}
h1{margin:0;font-size:clamp(24px,6.4vw,34px);line-height:1.15;font-weight:800;min-height:2.3em}
h1.in{animation:promptin .55s ease both}
@keyframes promptin{from{opacity:0;transform:translateY(10px);filter:blur(4px)}to{opacity:1;transform:none;filter:none}}
.timer{position:relative;height:12px;border-radius:8px;background:rgba(255,255,255,.14);overflow:hidden}
.timer i{position:absolute;inset:0 auto 0 0;width:100%;background:linear-gradient(90deg,#6df0c2,#ffd45e);border-radius:8px}
.timer span{position:absolute;right:8px;top:-1px;font-size:10px;font-weight:800;line-height:14px;color:#052}
.timer.low{animation:pulse .5s ease-in-out infinite alternate}.timer.low i{background:linear-gradient(90deg,#ff6b6b,#ffb36b)}
@keyframes pulse{to{box-shadow:0 0 14px 3px rgba(255,107,107,.7)}}
form{display:flex;gap:10px}
input{flex:1;min-width:0;font-size:20px;padding:14px 14px;border-radius:14px;border:2px solid var(--line);background:rgba(2,12,30,.6);color:#fff;outline:none;transition:border .2s}
input:focus{border-color:#8fe3ff}input::placeholder{color:#7fa4c0}
input.shake{animation:shake .4s}
@keyframes shake{20%{transform:translateX(-9px)}40%{transform:translateX(8px)}60%{transform:translateX(-6px)}80%{transform:translateX(4px)}}
.go{min-width:84px}
.hint{min-height:1.3em;margin:0;color:#ffd0a8;font-size:14px}
.reveal{display:flex;flex-direction:column;gap:12px;animation:fadein .5s both}
.res{font-size:17px;font-weight:700}
.res em{font-style:normal;padding:2px 10px;border-radius:999px;color:#04202f;font-size:13px;font-weight:900;margin-left:6px}
.others{display:flex;flex-direction:column;gap:8px;max-height:26vh;overflow:auto}
.orow{display:flex;gap:6px;flex-wrap:wrap;align-items:center}
.orow .tl{font-size:11px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;width:78px;flex:none}
.chip{padding:5px 10px;border-radius:999px;font-size:13px;background:rgba(255,255,255,.1);border:1px solid var(--line);opacity:0;animation:chip .35s ease forwards}
@keyframes chip{from{opacity:0;transform:translateY(6px) scale(.9)}to{opacity:1;transform:none}}
/* result */
#result{justify-content:center}
.rcard{width:min(460px,100%);background:var(--card);border:1px solid var(--line);border-radius:26px;padding:24px 20px;text-align:center;backdrop-filter:blur(12px);box-shadow:0 20px 60px rgba(0,10,30,.45);max-height:100%;overflow:auto}
.rkick{font-size:12px;letter-spacing:.2em;text-transform:uppercase;color:var(--mut)}
.rdepth{font-size:64px;font-weight:900;line-height:1.05;margin:6px 0 2px;font-variant-numeric:tabular-nums;text-shadow:0 0 30px rgba(143,227,255,.6)}.rdepth span{font-size:22px;color:var(--mut);margin-left:4px}
.rtitle{font-size:22px;font-weight:800;color:#ffd45e;margin-bottom:12px}
.dots{display:flex;justify-content:center;gap:8px;margin:10px 0}
.dots i{width:30px;height:30px;border-radius:10px;opacity:0;animation:chip .4s ease forwards}
.rlines{text-align:left;font-size:14px;color:var(--mut);display:flex;flex-direction:column;gap:4px;margin:12px 0}
.rlines b{color:var(--ink)}
.rbtns{display:flex;flex-direction:column;gap:10px;margin-top:8px}
/* modal and toast */
.modal{position:fixed;inset:0;z-index:20;background:rgba(0,8,22,.6);display:flex;align-items:center;justify-content:center;padding:16px;backdrop-filter:blur(4px)}
.modal[hidden]{display:none}
.mbox{width:min(480px,100%);max-height:88vh;overflow:auto;background:#0b2243;border:1px solid var(--line);border-radius:22px;padding:20px;display:flex;flex-direction:column;gap:12px}
.mbox h2{margin:0}.mbox p,.mbox li{color:#cfe6f6;font-size:15px}.mbox ul{padding-left:20px;margin:0}
.tierrow{display:flex;justify-content:space-between;gap:8px;padding:6px 10px;border-radius:10px;background:rgba(255,255,255,.06);font-weight:700;font-size:14px;margin:4px 0}
.bar{height:8px;border-radius:6px;background:rgba(255,255,255,.12);overflow:hidden;margin-top:4px}.bar i{display:block;height:100%}
.toast{position:fixed;left:50%;bottom:26px;transform:translate(-50%,40px);background:#0b2243;border:1px solid var(--line);padding:10px 16px;border-radius:14px;opacity:0;transition:.3s;z-index:30;pointer-events:none;max-width:90vw}
.toast.on{opacity:1;transform:translate(-50%,0)}
@media (prefers-reduced-motion:reduce){*{animation-duration:.01ms!important;animation-iteration-count:1!important}#rays{animation:none}}
@media (max-height:620px){h1{min-height:0}.stagebox{height:96px}.others{max-height:18vh}}
[hidden]{display:none!important}
.card>*{flex-shrink:0}