*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}html,body{margin:0;width:100%;height:100%;overflow:hidden;overscroll-behavior:none;background:#143d35;font-family:ui-rounded,"Arial Rounded MT Bold",system-ui,sans-serif;color:#fff;touch-action:none;user-select:none}button{font:inherit;cursor:pointer;border:0;color:inherit;touch-action:manipulation}button:focus-visible{outline:4px solid #fff;outline-offset:5px}button:active{transform:translateY(3px)}#game{position:fixed;inset:0;width:100%;height:100%;display:block}#hud{position:fixed;top:max(20px,env(safe-area-inset-top));left:max(24px,env(safe-area-inset-left));right:max(24px,env(safe-area-inset-right));display:flex;align-items:flex-start;justify-content:space-between;pointer-events:none;z-index:3}#hud button{pointer-events:auto}.size-card{background:#143b3ce8;border:2px solid #b4eee36b;border-radius:24px;padding:12px 22px 18px 12px;min-width:178px;display:flex;align-items:center;gap:12px;position:relative;box-shadow:0 5px 0 #082e2d33}.eyebrow{display:block;letter-spacing:2px;font-size:10px;font-weight:900;color:#b5e3d4}.size-card strong{font-size:34px;line-height:1.1}.snake-icon{background:linear-gradient(140deg,#72fff0,#02aca4);border:3px solid #d4fff9;border-radius:50%;width:49px;height:49px;color:#00b3ad;font-size:34px;position:relative}.snake-icon i{position:absolute;left:8px;top:0px;color:#153840;font:900 27px sans-serif;letter-spacing:3px}.growth{position:absolute;bottom:7px;left:75px;right:18px;height:5px;background:#031c2d70;border-radius:8px;overflow:hidden}.growth span{display:block;height:100%;background:#c4f761;width:16%;transition:width .3s}.brand{text-align:center;line-height:.9;text-shadow:0 4px 0 #273e2d,0 6px 12px #143d3550;transform:rotate(-3deg);padding-top:3px}.brand span{font-size:23px;color:#ffe994;font-weight:1000;letter-spacing:3px}.brand strong{display:block;font-size:38px;color:#e5ff9c;letter-spacing:-2px}.hud-right{display:flex;gap:10px;align-items:center}.best{text-align:center;margin-right:10px}.best strong{font-size:23px}.circle{width:50px;height:50px;background:#153d3ce8;border:2px solid #c4f5df70;border-radius:18px;font-size:26px;font-weight:900}.overlay{position:fixed;inset:0;z-index:9;display:flex;align-items:center;justify-content:center;background:#05251c66;backdrop-filter:blur(5px);padding:20px;overflow:auto;touch-action:pan-y}.hidden{display:none!important}#menu{justify-content:space-between;padding:35px clamp(25px,6vw,110px);background:linear-gradient(90deg,#092e24a8,transparent 80%);backdrop-filter:none}.menu-card{width:390px;max-width:100%;padding:27px 32px 21px;background:#113d35ed;border:1px solid #a9eed534;border-radius:32px;box-shadow:0 25px 100px #07352780;text-align:center;flex-shrink:0}.pill{display:inline-block;background:#dfff9a14;color:#d8fcb0;border:1px solid #d4f6a642;border-radius:30px;padding:7px 13px;font-size:9px;font-weight:850;letter-spacing:1.5px}h1{font-size:54px;line-height:.92;margin:24px 0 10px;letter-spacing:-2px;color:#fff0a9;text-shadow:0 5px 0 #092a23}h1 em{font-style:normal;font-size:63px;color:#c7f57c}.intro{color:#bbd9cc;font-size:14px;margin:18px 0 22px}.world-picker{display:flex;gap:10px}.world{flex:1;background:#ffffff08;border:2px solid #ffffff15;border-radius:17px;padding:11px 5px;color:#c5dcd4}.world span{font-size:27px;display:block;margin-bottom:4px}.world b{display:block;font-size:14px}.world small{font-size:10px;display:block;margin-top:3px;opacity:.7}.world.selected{background:#c6f77a12;border-color:#c5f478;color:#e8ffc6}.mode-row{display:flex;gap:8px;margin:17px 0}.mode-row button{width:50%;font-weight:750;font-size:12px;border-radius:10px;padding:10px 4px;background:#ffffff0a;color:#bdcfc6}.mode-row button.selected{background:#e8f2df;color:#224a39}.primary{display:block;width:100%;padding:17px 16px;border-radius:16px;background:linear-gradient(#ffe789,#ffc740);box-shadow:0 5px 0 #b6841d;color:#3c421f;letter-spacing:1px;font-weight:950;font-size:17px}.primary span{margin-left:16px}.how{display:flex;justify-content:space-between;gap:5px;margin:23px -5px 10px;font-size:10px;color:#d2e6d9}.how b{display:inline-grid;place-items:center;border-radius:50%;background:#b8e872;color:#23482c;width:20px;height:20px;margin-right:3px}.how span:nth-child(2) b{background:#ffc84e}.input-tip{font-size:10px;line-height:1.6;color:#99bbaa}.text-button{background:none;color:#b1cdc1;text-decoration:underline;text-underline-offset:4px;font-size:10px;padding:10px 0 0}.menu-side{align-self:flex-end;text-align:right;margin-bottom:35px;max-width:420px;text-shadow:0 3px 20px #09281990}.side-kicker{font-size:10px;letter-spacing:3px;color:#e4f5bf}.menu-side h2{font-size:48px;letter-spacing:-2px;line-height:1.05;margin:20px 0;color:#fff8d8}.menu-side p{font-size:17px;line-height:1.6;color:#e0efdb}.side-badge{display:inline-block;font-size:11px;background:#143c2cc9;border:1px solid #ffffff33;border-radius:20px;padding:10px 15px}.dialog{width:400px;max-width:100%;background:#143f36;border:1px solid #ccf5cb55;border-radius:30px;padding:30px;text-align:center;box-shadow:0 25px 100px #082b2580}.dialog-symbol{font-size:45px}.dialog h2{font-size:28px;letter-spacing:-1px;margin:14px 0;color:#f5f9d6}.dialog p{font-size:14px;line-height:1.6;color:#b8d5c4}.secondary{background:none;border:1px solid #d8ebcd44;width:100%;padding:13px;border-radius:14px;margin-top:17px;color:#deecd5;font-size:14px}.result{display:flex;gap:10px;margin:23px 0}.result>div{flex:1;background:#082f2866;padding:13px;border-radius:15px}.result small{display:block;font-size:9px;letter-spacing:1px;color:#afd6b5}.result strong{font-size:37px;color:#e1f99c}.dialog ol{text-align:left;font-size:14px;line-height:1.6;color:#def0dc;padding-left:20px}.dialog li{padding:6px 0}.dialog small{opacity:.7}#controls{position:fixed;bottom:max(26px,env(safe-area-inset-bottom));left:max(30px,env(safe-area-inset-left));right:max(30px,env(safe-area-inset-right));display:flex;justify-content:space-between;align-items:flex-end;pointer-events:none;z-index:4}#joystick{width:146px;height:146px;background:#153f4b30;border:2px solid #e9ffeb80;border-radius:50%;position:relative;pointer-events:auto;touch-action:none;box-shadow:inset 0 2px 20px #0a352526}#stick{position:absolute;left:43px;top:43px;width:56px;height:56px;border-radius:50%;background:linear-gradient(#d4fff4,#5dd7bd);border:2px solid #f1fff4;box-shadow:0 5px 12px #173f4c40;pointer-events:none}.arrow{position:absolute;color:#f4ffe38c;font-size:15px}.up{top:9px;left:63px}.down{bottom:8px;left:63px}.left{left:10px;top:60px}.right{right:10px;top:60px}.boost-wrap{pointer-events:auto;text-align:center;width:112px}#boost{width:108px;height:108px;border-radius:50%;background:linear-gradient(#fff09b,#ffbd2d);border:4px solid #fff1ae;box-shadow:0 6px 0 #b5832280,0 7px 25px #4b571b25;color:#765317;display:flex;flex-direction:column;align-items:center;justify-content:center;touch-action:none}#boost span{font-size:62px;line-height:.8;color:#fff8d6;text-shadow:0 2px #bd831e}#boost b{font-size:13px;margin-top:8px;font-weight:900}.energy{height:7px;background:#153d3c88;margin:12px 10px 0;border-radius:6px;overflow:hidden}.energy i{display:block;height:100%;width:100%;background:#ffe280;border-radius:6px}#legend{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);color:#f2ffe7;font-size:11px;font-weight:750;background:#143e36bc;border:1px solid #d1f6c933;padding:10px 17px;border-radius:30px;white-space:nowrap;z-index:3}#legend span{display:inline-grid;place-items:center;width:19px;height:19px;border-radius:50%;margin:0 4px 0 12px;color:#224326}#legend span:first-child{margin-left:0}.safe{background:#c0f17d}.danger{background:#ffca68}#hint{position:fixed;top:120px;left:50%;transform:translateX(-50%);color:#f4ffdd;background:#153c34b3;padding:10px 20px;font-size:12px;font-weight:700;border-radius:20px;pointer-events:none;z-index:4;white-space:nowrap;transition:opacity .5s}#toast{position:fixed;top:135px;left:50%;transform:translateX(-50%);font-size:24px;font-weight:900;color:#fff3aa;text-shadow:0 3px 0 #284a30;z-index:5;pointer-events:none}#labels,#effects{position:fixed;inset:0;pointer-events:none;overflow:hidden;z-index:2}.snake-label{position:absolute;top:0;left:0;white-space:nowrap;text-align:center;font-size:20px;font-weight:1000;color:#fffdeb;text-shadow:0 2px 1px #193a35,2px 0 1px #193a35,-2px 0 1px #193a35,0 -2px 1px #193a35;will-change:transform}.snake-label small{display:block;color:#b8ffff;font-size:11px;letter-spacing:1px}.snake-label i{display:inline-grid;place-items:center;border-radius:50%;width:21px;height:21px;margin-left:5px;font-size:14px;font-style:normal;color:#234629;background:#c1ed73;text-shadow:none;border:2px solid #fffad2}.snake-label i.warn{background:#ffd06c}.snake-label i.equal{background:#d0e8e8}.pop{position:absolute;font-size:28px;font-weight:1000;white-space:nowrap;color:#fff49d;text-shadow:0 3px 0 #84642a,2px 0 0 #84642a,-2px 0 0 #84642a;will-change:transform}#loading{position:fixed;inset:0;display:grid;place-items:center;background:#153f35;color:#e7fac4;font-weight:800;z-index:30}.playing #menu{display:none}.menu-open #hud,.menu-open #controls,.menu-open #legend,.menu-open #hint,.menu-open #labels{display:none}.cosmic .brand span{color:#8bf6ff}.cosmic .brand strong{color:#ffe29b}.cosmic .menu-card,.cosmic .dialog{background:#282149ed}.cosmic .circle,.cosmic .size-card{background:#29234ce8}.cosmic h1{color:#89ebf8}.cosmic h1 em{color:#ffe492}.cosmic #menu{background:linear-gradient(90deg,#191335bc,transparent 80%)}
@media(max-height:690px) and (min-width:700px){.menu-card{padding:20px 27px;width:350px}h1{font-size:43px;margin-top:15px}h1 em{font-size:51px}.intro{margin:12px 0 15px}.world{padding:7px 5px}.world span{font-size:23px}.mode-row{margin:12px 0}.how{margin-top:18px}.primary{padding:13px}.input-tip{margin:9px 0}.text-button{padding-top:5px}#menu{padding-top:15px;padding-bottom:15px}.menu-side h2{font-size:40px}}
@media(max-width:700px){.menu-side{display:none}#menu{justify-content:center;padding:15px}.menu-card{padding:24px;max-height:96dvh;overflow:auto}#hud{top:max(13px,env(safe-area-inset-top));left:12px;right:12px}.brand span{font-size:15px}.brand strong{font-size:24px}.size-card{min-width:110px;padding:8px 12px 16px 9px;gap:6px;border-radius:18px}.snake-icon{width:33px;height:33px;font-size:21px}.snake-icon i{font-size:18px;left:4px;top:1px;letter-spacing:2px}.eyebrow{font-size:8px;letter-spacing:1px}.size-card strong{font-size:24px}.growth{left:48px;right:12px}.circle{width:39px;height:39px;border-radius:14px;font-size:21px}.hud-right{gap:5px}.best{display:none}#hint{font-size:10px;top:100px;max-width:92%;white-space:normal;text-align:center}#controls{bottom:25px;left:20px;right:20px}#joystick{width:125px;height:125px}#stick{left:33px;top:33px}.up,.down{left:53px}.left,.right{top:49px}#boost{width:90px;height:90px}.boost-wrap{width:94px}#boost span{font-size:49px}#legend{bottom:180px;font-size:10px;padding:7px 12px}#toast{font-size:20px;top:140px}}
@media(max-height:500px){.menu-card{width:500px;padding:14px 25px}.pill,.intro,.input-tip,.menu-side,.world small{display:none}h1{font-size:32px;line-height:1;margin:8px 0 10px}h1 br{display:none}h1 em{font-size:32px;margin-left:6px}.world{padding:6px;display:flex;justify-content:center;align-items:center;gap:8px}.world span{font-size:22px;margin:0}.mode-row{margin:10px 0}.how{margin:14px 0 3px}.primary{padding:11px}.text-button{padding-top:6px}#menu{justify-content:center}.dialog{padding:18px 25px}.dialog-symbol{display:none}#joystick{transform:scale(.8);transform-origin:bottom left}#boost{width:80px;height:80px}#boost span{font-size:44px}#hint{top:100px}.brand strong{font-size:27px}.brand span{font-size:17px}}

/* Subtle edge shading keeps the playfield centre bright. */
body::after{content:"";position:fixed;inset:0;pointer-events:none;z-index:1;background:radial-gradient(ellipse at 50% 42%,transparent 46%,#143f341c 100%)}.cosmic::after{background:radial-gradient(ellipse at 50% 42%,transparent 40%,#2117442b 100%)}
.size-card strong{display:block;transform-origin:center}.pop{letter-spacing:-1px}