[verified] refactor: establish service and frontend boundaries

public/styles/base.css

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+*{box-sizing:border-box}html,body{min-height:100%}body{margin:0;min-height:100vh;font-family:var(--animal-font-family);font-weight:500;letter-spacing:.01em;color:var(--animal-text-color);background:var(--animal-bg-color);overflow:hidden}button,input,select,textarea{font:inherit;color:inherit}button{cursor:pointer}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,.sim-device-card:focus-visible{outline:3px solid #ffcc00;outline-offset:3px}
+.island-bg{position:fixed;inset:0;z-index:-1;overflow:hidden;background:radial-gradient(circle at 12% 10%,rgba(130,213,187,.28),transparent 24%),radial-gradient(circle at 88% 6%,rgba(247,205,103,.28),transparent 22%),linear-gradient(180deg,#f8f8f0 0%,#f4efd9 54%,#e8dfbd 100%)}.island-bg:before{content:"";position:absolute;inset:0;background-image:radial-gradient(circle,rgba(196,184,158,.15) 1.5px,transparent 1.5px),radial-gradient(circle,rgba(196,184,158,.1) 1px,transparent 1px);background-size:28px 28px,14px 14px;background-position:0 0,7px 7px}.cloud{position:absolute;border-radius:999px;background:rgba(255,255,255,.72)}.cloud:before,.cloud:after{content:"";position:absolute;border-radius:50%;background:inherit}.cloud-a{width:170px;height:48px;left:8%;top:7%}.cloud-a:before{width:72px;height:72px;left:28px;top:-28px}.cloud-a:after{width:56px;height:56px;right:26px;top:-18px}.cloud-b{width:210px;height:58px;right:8%;top:12%;opacity:.7}.cloud-b:before{width:86px;height:86px;left:34px;top:-36px}.cloud-b:after{width:72px;height:72px;right:28px;top:-26px}.leaf{position:absolute;color:#8ac68a;font-size:18px;opacity:.42;animation:leafFloat 7s ease-in-out infinite}.leaf-a{left:46%;top:8%}.leaf-b{right:26%;bottom:9%;animation-delay:1.7s}@keyframes leafFloat{0%,100%{transform:translateY(0) rotate(0)}50%{transform:translateY(-12px) rotate(12deg)}}