:root{--bg-color:#f8fafc;--surface-color:#ffffff;--text-primary:#0f172a;--text-secondary:#64748b;--accent-color:#3b82f6;--accent-hover:#2563eb;--danger-color:#ef4444;--success-color:#10b981;--border-color:#e2e8f0;--shadow-sm:0 1px 2px 0 rgb(0 0 0/0.05);--shadow-md:0 4px 6px -1px rgb(0 0 0/0.1),0 2px 4px -2px rgb(0 0 0/0.1);--shadow-lg:0 10px 15px -3px rgb(0 0 0/0.1),0 4px 6px -4px rgb(0 0 0/0.1);--radius-md:0.75rem;--radius-lg:1rem;--radius-full:9999px;--transition-fast:150ms cubic-bezier(0.4,0,0.2,1);--transition-normal:300ms cubic-bezier(0.4,0,0.2,1);font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;color-scheme:light}[data-theme=dark]{--bg-color:#0f172a;--surface-color:#1e293b;--text-primary:#f8fafc;--text-secondary:#94a3b8;--accent-color:#60a5fa;--accent-hover:#3b82f6;--danger-color:#f87171;--success-color:#34d399;--border-color:#334155;--shadow-sm:0 1px 2px 0 rgb(0 0 0/0.3);--shadow-md:0 4px 6px -1px rgb(0 0 0/0.4),0 2px 4px -2px rgb(0 0 0/0.4);--shadow-lg:0 10px 15px -3px rgb(0 0 0/0.4),0 4px 6px -4px rgb(0 0 0/0.4);color-scheme:dark}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-color);color:var(--text-primary);transition:background-color var(--transition-normal),color var(--transition-normal);-webkit-font-smoothing:antialiased;min-height:100vh}.glass-panel{background:var(--surface-color);border:1px solid var(--border-color);box-shadow:var(--shadow-md);border-radius:var(--radius-lg);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px)}button{font-family:inherit;cursor:pointer;border:none;background:none;outline:none;transition:all var(--transition-fast)}button:active{transform:scale(.97)}.btn-primary{background-color:var(--accent-color);color:#fff;padding:.75rem 1.5rem;border-radius:var(--radius-full);font-weight:600;box-shadow:0 4px 14px 0 rgba(59,130,246,.39)}.btn-primary:hover{background-color:var(--accent-hover);box-shadow:0 6px 20px rgba(59,130,246,.23);transform:translateY(-1px)}.btn-icon{display:inline-flex;align-items:center;justify-content:center;width:3rem;height:3rem;font-size:1.5rem;border-radius:var(--radius-full);background-color:var(--surface-color);border:1px solid var(--border-color);color:var(--text-primary);box-shadow:var(--shadow-sm)}.btn-icon:hover{background-color:var(--bg-color);transform:translateY(-2px)}input[type=text],textarea{width:100%;padding:.75rem 1rem;border-radius:var(--radius-md);border:1px solid var(--border-color);background-color:var(--bg-color);color:var(--text-primary);font-family:inherit;transition:border-color var(--transition-fast),box-shadow var(--transition-fast)}input[type=text]:focus,textarea:focus{border-color:var(--accent-color);box-shadow:0 0 0 3px rgba(59,130,246,.25);outline:none}h1,h2,h3,h4{font-weight:700;letter-spacing:-.025em;margin-bottom:.5rem}.text-gradient{background-clip:text;-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-image:linear-gradient(to right,var(--accent-color),#8b5cf6)}.app-container{max-width:600px;margin:0 auto;padding:1.5rem 1.5rem 5rem}.flex-center{justify-content:center}.flex-between,.flex-center{display:flex;align-items:center}.flex-between{justify-content:space-between}.bottom-nav{position:fixed;bottom:0;left:0;right:0;background-color:var(--surface-color);border-top:1px solid var(--border-color);display:flex;justify-content:space-around;padding:.65rem 0 calc(.75rem + env(safe-area-inset-bottom));z-index:50;box-shadow:0 -4px 6px -1px rgb(0 0 0/.05)}.nav-item{display:flex;flex-direction:column;align-items:center;color:var(--text-secondary);font-size:.75rem;font-weight:500;text-decoration:none;gap:.25rem;transition:color var(--transition-fast)}.nav-item.active{color:var(--accent-color)}.nav-item svg{width:1.5rem;height:1.5rem}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background-color:rgba(0,0,0,.5);-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:100;padding:1rem;animation:fadeIn .2s ease-out}.modal-content{width:100%;max-width:500px;background-color:var(--surface-color);border-radius:var(--radius-lg);padding:1.5rem;box-shadow:var(--shadow-lg);animation:slideUp .3s cubic-bezier(.16,1,.3,1)}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(20px) scale(.95)}to{opacity:1;transform:translateY(0) scale(1)}}.water-tracker{display:flex;align-items:center;gap:1rem;margin-top:1rem}.water-progress-bar{flex-grow:1;height:8px;background-color:var(--border-color);border-radius:var(--radius-full);overflow:hidden;position:relative}.water-progress-fill{height:100%;background-color:#38bdf8;border-radius:var(--radius-full);transition:width var(--transition-normal)}.water-threshold{position:absolute;top:0;bottom:0;left:calc(14 / 20 * 100%);width:2px;background-color:var(--danger-color);z-index:10}