:root{--ink:#1f2926;--muted:#7f8984;--cream:#f7f3eb;--paper:#fffdf9;--line:#e6e5df;--terracotta:#c87958;--shadow:0 18px 50px rgba(31,41,38,.10)}*{box-sizing:border-box}body{margin:0;background:#dfe5df;color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}.app-shell{width:min(100%,520px);min-height:100vh;margin:auto;background:var(--cream);padding:28px 20px 100px;position:relative;overflow:hidden}.hidden{display:none!important}.screen{min-height:calc(100vh - 56px)}.onboarding-screen{padding-top:12px}.brand-mark{width:48px;height:48px;display:grid;place-items:center;background:var(--ink);color:#dbe5d7;border-radius:16px;font-size:27px;margin-bottom:18px}.onboarding-screen h1{font-size:39px;line-height:.99;letter-spacing:-.065em;max-width:430px;margin:12px 0}.lead{font-size:16px;line-height:1.45;color:#69736e;max-width:420px}.onboarding-image{width:100%;height:235px;object-fit:cover;object-position:50% 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p{font-size:12px;line-height:1.35;margin-top:4px;color:#59655e}.round-btn{background:var(--ink);color:#fff;font-size:20px}.stats-grid,.measure-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}.stat,.measure-grid>div{background:var(--paper);border:1px solid var(--line);border-radius:18px;padding:15px}.stat span,.measure-grid span{display:block;font-size:9px;letter-spacing:.12em;color:var(--muted);font-weight:800}.stat strong,.measure-grid strong{display:block;font-size:22px;letter-spacing:-.05em;margin:7px 0 2px}.stat small,.measure-grid small{color:var(--muted);font-size:10px}.bottom-nav{position:fixed;bottom:0;left:50%;transform:translateX(-50%);width:min(100%,520px);height:76px;background:rgba(255,253,249,.95);backdrop-filter:blur(16px);border-top:1px solid var(--line);display:flex;justify-content:space-around;padding:10px 4px 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