:root{--primary:#6366f1;--primary-dark:#4f46e5;--bg:#0f0f0f;--bg-card:#1a1a1a;--bg-input:#252525;--text:#fff;--text-muted:#a1a1aa;--border:#2a2a2a;--success:#22c55e;--error:#ef4444}*{box-sizing:border-box;margin:0;padding:0}body,html{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);min-height:100vh}.container{max-width:600px;margin:0 auto;padding:1rem 1rem 5rem}.header{text-align:center;padding:1.5rem 0;border-bottom:1px solid var(--border);margin-bottom:1.5rem}.header h1{font-size:1.5rem;font-weight:700}.card{background:var(--bg-card);border-radius:12px;padding:1rem;margin-bottom:1rem;border:1px solid var(--border)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.75rem 1.5rem;border-radius:8px;border:none;font-size:1rem;font-weight:600;cursor:pointer;transition:all .2s;width:100%}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-dark)}.btn-secondary{border:1px solid var(--border)}.btn-secondary,.input{background:var(--bg-input);color:var(--text)}.input{width:100%;padding:.75rem;border-radius:8px;border:1px solid var(--border);font-size:1rem}.input:focus{outline:none;border-color:var(--primary)}.input-group{margin-bottom:1rem}.input-group label{display:block;margin-bottom:.5rem;color:var(--text-muted);font-size:.875rem}.exercise-card{background:var(--bg-card);border-radius:12px;padding:1rem;margin-bottom:.75rem;border:1px solid var(--border)}.exercise-name{font-weight:600;font-size:1.1rem;margin-bottom:.5rem}.exercise-details{display:flex;gap:1rem;color:var(--text-muted);font-size:.9rem;margin-bottom:.75rem}.weight-input-row{display:flex;gap:.5rem;align-items:center}.weight-input-row input{flex:1 1;padding:.5rem}.weight-input-row button{padding:.5rem 1rem;white-space:nowrap}.day-header{font-size:1.2rem;font-weight:700;padding:1rem 0;border-bottom:1px solid var(--border);margin-bottom:1rem;color:var(--primary)}.tabs{display:flex;gap:.5rem;margin-bottom:1.5rem;overflow-x:auto;padding-bottom:.5rem}.tab{padding:.5rem 1rem;border-radius:20px;background:var(--bg-input);border:1px solid var(--border);color:var(--text-muted);font-size:.875rem;cursor:pointer;white-space:nowrap}.tab.active{background:var(--primary);color:#fff;border-color:var(--primary)}.upload-zone{border:2px dashed var(--border);border-radius:12px;padding:2rem;text-align:center;cursor:pointer;transition:all .2s}.upload-zone:hover{border-color:var(--primary);background:rgba(99,102,241,.1)}.upload-zone input{display:none}.nav-bottom{position:fixed;bottom:0;left:0;right:0;background:var(--bg-card);border-top:1px solid var(--border);display:flex;justify-content:space-around;padding:.75rem}.nav-item{display:flex;flex-direction:column;align-items:center;gap:.25rem;color:var(--text-muted);text-decoration:none;font-size:.75rem;cursor:pointer}.nav-item.active{color:var(--primary)}.loading{display:flex;justify-content:center;padding:2rem}.spinner{width:40px;height:40px;border:3px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(1turn)}}.message{padding:1rem;border-radius:8px;margin-bottom:1rem}.message.success{background:rgba(34,197,94,.2);border:1px solid var(--success)}.message.error{background:rgba(239,68,68,.2);border:1px solid var(--error)}.empty-state{text-align:center;padding:3rem 1rem;color:var(--text-muted)}.empty-state h3{margin-bottom:.5rem;color:var(--text)}.weight-history{margin-top:.5rem;padding-top:.5rem;border-top:1px solid var(--border);font-size:.8rem;color:var(--text-muted)}.auth-container{max-width:400px;margin:0 auto;padding:2rem 1rem;min-height:100vh;display:flex;flex-direction:column;justify-content:center}.auth-header{text-align:center;margin-bottom:2rem}.auth-header h1{font-size:2rem;font-weight:700;color:var(--primary);margin-bottom:.5rem}.auth-header p{color:var(--text-muted)}.auth-form{background:var(--bg-card);padding:1.5rem;border-radius:12px;border:1px solid var(--border)}.auth-form h2{text-align:center;margin-bottom:1.5rem;font-size:1.25rem}.form-group{margin-bottom:1rem}.form-group label{display:block;margin-bottom:.5rem;color:var(--text-muted);font-size:.875rem}.btn-full{width:100%;margin-top:.5rem}.auth-link{text-align:center;margin-top:1.5rem;color:var(--text-muted);font-size:.875rem}.auth-link a{color:var(--primary);text-decoration:none}.auth-link a:hover{text-decoration:underline}.header-content{justify-content:space-between}.header-content,.user-info{display:flex;align-items:center}.user-info{gap:.75rem}.user-name{font-size:.875rem}.btn-logout,.user-name{color:var(--text-muted)}.btn-logout{background:transparent;border:1px solid var(--border);padding:.375rem .75rem;border-radius:6px;font-size:.75rem;cursor:pointer;transition:all .2s}.btn-logout:hover{border-color:var(--error);color:var(--error)}.btn-logout:disabled{opacity:.5;cursor:not-allowed}.btn-delete{background:transparent;border:1px solid var(--border);color:var(--text-muted);padding:.375rem .75rem;border-radius:6px;font-size:1rem;cursor:pointer;transition:all .2s}.btn-delete:hover{border-color:var(--error);color:var(--error);background:rgba(239,68,68,.1)}.btn-delete:disabled{opacity:.5;cursor:not-allowed}.exercise-name-edit{margin-bottom:.5rem}.exercise-name-edit input{font-weight:600;font-size:1.1rem}.exercise-name:hover{color:var(--primary)}