:root{--primary-color: #2563eb;--primary-hover: #1d4ed8;--bg-color: #f8fafc;--surface-color: #ffffff;--text-primary: #0f172a;--text-secondary: #64748b;--border-color: #e2e8f0;--success-color: #10b981;--danger-color: #ef4444;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1), 0 2px 4px -1px rgba(0, 0, 0, .06);--radius-md: .5rem;--radius-lg: 1rem}@media (prefers-color-scheme: dark){:root{--primary-color: #3b82f6;--primary-hover: #60a5fa;--bg-color: #0f172a;--surface-color: #1e293b;--text-primary: #f8fafc;--text-secondary: #94a3b8;--border-color: #334155}}*{box-sizing:border-box;margin:0;padding:0}html,body{height:100%;height:-webkit-fill-available;background-color:var(--bg-color);margin:0;padding:0}body{font-family:Inter,system-ui,Avenir,Helvetica,Arial,sans-serif;background-color:var(--bg-color);color:var(--text-primary);line-height:1.5;-webkit-font-smoothing:antialiased;display:flex;justify-content:center;min-height:100vh;min-height:-webkit-fill-available;overscroll-behavior:none}#root{display:flex;flex-direction:column;width:100%;max-width:500px;height:100vh;height:100dvh;overflow:hidden;background-color:var(--bg-color);box-shadow:0 0 40px #0000001a;position:relative}.main-content{flex:1;overflow-y:auto;padding:1rem;padding-top:calc(1rem + env(safe-area-inset-top));padding-bottom:calc(5.5rem + env(safe-area-inset-bottom))}h1{font-size:1.5rem;font-weight:700;margin-bottom:1rem}h2{font-size:1.25rem;font-weight:600;margin-bottom:.75rem}p{margin-bottom:1rem}.card{background-color:var(--surface-color);border-radius:var(--radius-lg);padding:1rem;box-shadow:var(--shadow-md);margin-bottom:1rem;border:1px solid var(--border-color)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;background-color:var(--primary-color);color:#fff;border:none;border-radius:var(--radius-md);padding:.75rem 1.5rem;font-size:1rem;font-weight:500;cursor:pointer;transition:background-color .2s,transform .1s}.btn:hover{background-color:var(--primary-hover)}.btn:active{transform:scale(.98)}.btn:disabled{opacity:.6;cursor:not-allowed}.btn-outline{background-color:transparent;color:var(--primary-color);border:1px solid var(--primary-color)}.btn-outline:hover{background-color:#3b82f61a}.btn-danger{background-color:var(--danger-color)}.btn-danger:hover{background-color:#dc2626}.input{width:100%;padding:.75rem;border:1px solid var(--border-color);border-radius:var(--radius-md);background-color:var(--surface-color);color:var(--text-primary);font-size:1rem;margin-bottom:1rem}.input:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 2px #3b82f633}.bottom-nav{position:absolute;bottom:0;left:0;right:0;height:calc(4.5rem + env(safe-area-inset-bottom));background-color:var(--surface-color);border-top:1px solid var(--border-color);display:flex;justify-content:space-around;align-items:center;z-index:100;padding-bottom:env(safe-area-inset-bottom);box-shadow:0 -4px 12px #0000000d}.nav-item{display:flex;flex-direction:column;align-items:center;justify-content:center;color:var(--text-secondary);text-decoration:none;font-size:.75rem;gap:.25rem;flex:1;height:4rem}.nav-item.active{color:var(--primary-color)}.macros-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:.5rem;text-align:center;margin-top:.5rem}.macro-item{background-color:var(--bg-color);padding:.5rem;border-radius:var(--radius-md);display:flex;flex-direction:column}.macro-value{font-weight:700;font-size:1.1rem}.macro-label{font-size:.7rem;color:var(--text-secondary);text-transform:uppercase}.image-upload-area{border:2px dashed var(--border-color);border-radius:var(--radius-lg);padding:2rem;text-align:center;cursor:pointer;transition:border-color .2s;display:flex;flex-direction:column;align-items:center;gap:1rem;color:var(--text-secondary)}.image-upload-area:hover{border-color:var(--primary-color);color:var(--primary-color)}.uploaded-image{width:100%;max-height:300px;object-fit:cover;border-radius:var(--radius-md)}.loader{border:3px solid var(--border-color);border-top:3px solid var(--primary-color);border-radius:50%;width:24px;height:24px;animation:spin 1s linear infinite;display:inline-block}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}input[type=range]{width:100%;margin:1rem 0}